Basic calculations for the mass preparation department. Equipment for the preparation and production of paper pulp Calculation of the capacity of the thickener for the production of paper pulp

08.03.2020

Ingredient Feeder INFE 4002Dosing equipment for the preparation of mass for ice cream. Equipped with two independent hoppers for supplying two different types of additives at once. Thanks to servo drives, special weights, you can conveniently and accurately control the flow of dry and liquid additives with fruit pieces, for example. Maximum ingredient size up to 2-3cm. Feed pump: 3 blades Special scraper/rotor alloy Safety switches on inlet and body 3 inch mass inlet and outlet 90 x 74mm additive inlet. No sharp transitions, no clogging. The main parameters of the machine are: Hopper with screw feeder and agitator Screw feeder with variable pitch. Feeder does not clog when using different types of additives (different consistency) 2 agitator options Dynamic mixer with 9 blades Separate drives for pump, auger, agitator and post-mixer Frequency control for agitator and post-mixer drives 0-100% Frequency control for.. .

Short Description:

The design of the rotor ensures efficient waste paper separation at low energy consumption. The resulting fibrous suspension is sent to coarse screening. Heavy and large impurities accumulate in the waste chamber of the apparatus, are washed from the fiber and sent for further processing.

Defibrillation at high and medium mass concentration is usually carried out in a batch mode. The advantage of pulpers operating at high concentrations is “softer” conditions for waste paper defibration with minimal destruction of impurities and low specific energy consumption. Efficient defibration of waste paper without grinding impurities is ensured by the design of the screw rotor and the presence of reflective bars, or deflectors, installed on the walls of the pulper bath. The defoliated mass separated from large heavy impurities is sent to a deflocculator for final defoliation and separation of light and heavy impurities.

Short Description:

Bleach tower, which includes a vertical cylindrical body with a mixer of pulp and a bleaching agent, an absorption column installed in the casing and a means for supplying a bleaching agent, which in order to improve the quality of bleaching and reduce it. energy consumption, the means for supplying the bleaching agent is made in the form of a system of distribution pipes with a tangential introduction of the reagent into the mixer and the absorption column, and the pipes are offset relative to each other. along the height of the mixer and the absorption column and are installed at an angle to the vertical axis of the housing.

The best quality pulp;

Reduced production costs;

High reliability;

Ease and safety of operation;

Compliance with regulatory requirements;

Specifications:

Short Description:

The light impurity separator can treat the coarse sieve waste, which can crush the material and remove the impurities. The separator is widely used in waste paper recycling system and paper industry.

This equipment greatly simplifies the grinding process, while having a low energy consumption. Our impurity separators are designed for pulping and separating impurities from the pulp. For separating light and heavy impurities in pulp or pulped paper.

This machine consists of a steel bowl, a horizontal separator rotor, a driving device and an inlet pipe. With a weir plate inside the separator, heavy impurities are deposited at the bottom, while material and light impurities pass into the circulation zone for further inspection. As the agitator rotates, the material is divided axially and ejected at maximum speed from the periphery of the agitator. Thus, the number of cells...

Short Description:

For this project, a bladed electric mixer was developed, equipped with a stuffing box seal, an explosion-proof motor-reducer. The device can provide a high mixing volume and lower power consumption.

A propeller stirrer is considered the most effective in cases where, with a minimum consumption of mechanical energy, it is necessary to create a powerful circulation of liquid in the apparatus. Due to the pumping effect, propeller mixers create an axial circulation of the liquid, they easily lift solid particles from the bottom of the vessel, due to which propeller mixers are used to create suspensions - suspension.

Short Description:

Disc mills have a simple design, they are compact and less laborious to replace a worn-out set. Also, disc mills are characterized by a higher quality of the mass, since the fibers in this case are less susceptible to shortening, fibrillation, which is indispensable when grinding waste paper and pulp. There is also the possibility of using various kinds and types of sets in disc mills.

The fiber disintegration equipment is characterized by compact structure, light equipment weight, small footprint, high efficiency, low energy consumption, strong technology adaptability, simple operation, flexible setting, convenient installation, etc.

Specifications:

Sanding bar diameter, mm

Productivity, t./day

Input mass concentration, %

The drive for the thickener GT-12S is designed for installation on farms of single-tier thickeners of a closed type of heavy design.

The drive for the GT-12S thickener is used in the mining, metallurgical, coal industries.

The drive for the thickener GT-20 is designed for installation on farms of single-tier thickeners of a closed type of heavy design.

The drive for the GT-20 thickener is used in the mining, metallurgical, coal industries.

Delivery is carried out to any city in Russia, and we also work for export.

If you are interested in other equipment or spare parts, please contact us.

Our company is the official dealer of many factories and we can provide a comprehensive supply of equipment.

Berezniki Polytechnic College
technology of inorganic substances
course project on the discipline "Processes and apparatuses of chemical technology
on the topic: "Selection and calculation of a slurry thickener
Berezniki 2014

Technical specifications
Nominal diameter of the tub, m 9
Depth of the tub, m 3
Nominal precipitation area, m 60
Rowing device lifting height, mm 400
Duration of one revolution of strokes, min 5
Conditional capacity for solids at density
condensed product 60-70% and specific gravity of solid 2.5 t/m,
90 t/day
Drive unit
electric motor
Type 4AM112MA6UZ
Number of revolutions, rpm 960
Power, kW 3
V-belt transmission
Belt type A-1400T
Gear ratio 2
Reducer
Type Ts2U 200 40 12kg
Gear ratio 40
Gear ratio of rotation mechanism 46
Total gear ratio 4800
lifting mechanism
electric motor
Type 4AM112MA6UZ
Number of revolutions, rpm 960
Power, kW 2.2
V-belt transmission
Belt type A-1600T
Gear ratio 2.37
Worm gear ratio 40
Total gear ratio 94.8
load capacity
Rated, t 6
Maximum, t 15
Rise time, min 4

Compound: Assembly drawing (SB), Rotation mechanism, PZ

Soft: KOMPAS-3D 14

Pulp thickener - a device that continuously affects the diluted pulp to concentrate it through partial dehydration. By design, these devices can be disk, inclined, tape and drum.

The belt thickener is one of the most popular types. Its design includes two mesh-covered drums, which go around an endless rubberized belt.

Our company "TsBP-Service" offers the following models of thickeners: ZNP disc filter, ZNW drum thickener, ZNX inclined thickener.

Compact and efficient device made of stainless steel.

It performs well in thickening and washing pulp from recycled paper.

Specifications of the ZNP disc filter

Type	ZNP2508	ZNP2510	ZNP2512	ZNP2514	ZNP2516	ZNP3510	ZNP3512	ZNP3514	ZNP3516
Disc diameter (mm)	F 2500					F 3500
Disc number	8	10	12	14	16	10	12	14	16
Filtration area (m2)	60	70	90	105	120	150	180	210	240
Inlet concentration mass (%)	0.8-12
Concentration ref. mass (%)	3-4
	9-12				18-24
	5-7				10-14
Motor power (kW)	7.5	11		15		22		30

A device designed to work with low concentration fiber. It features simple structure and easy operation.

The enhanced dewatering function results in a thicker stock.

Specifications of ZNW Drum Thickener

The device is simple in structure and easy to maintain.

It produces a very high dewatering effect, which makes this model particularly in demand in the paper industry.

Specifications of ZNX Inclined Thickener

Paper pulp thickeners in St. Petersburg

You can buy paper pulp thickeners and other parts of a paper machine in our company "TsBP-Service".

Ministry of Education of the Russian Federation

Perm State Technical University

Department of TCBP

Group TTsBPz-04

COURSE PROJECT

Topic: "Calculation of the mass preparation department of the paper machine that produces paper for corrugating"

Akulov B.V.

Perm, 2009

Introduction

1. Characteristics of raw materials and finished products

Introduction

Paper is of great national economic importance, and its production. Paper production technology is complex, as it is often associated with the simultaneous use of fibrous semi-finished products of different properties, a large amount of water, heat and electricity, auxiliary chemicals and other resources and is accompanied by the formation of a large amount of industrial waste and effluents that adversely affect the environment. .

Assessing the general state of the problem, it should be noted that according to the European Confederation of Paper Producers (CEPI), since the beginning of the 90s, the volume of waste paper recycling in the world has increased by more than 69%, in Europe - by 55%. With a total stock of waste paper mass estimated at 230-260 million tons, about 150 million tons were collected in 2000, and by 2005 the collection is projected to increase to 190 million tons. At the same time, the average world level of consumption will be 48%. Against this background, the figures for Russia are more than modest. The total resources of waste paper are about 2 million tons. The volume of its procurement has been reduced compared to 1980 from 1.6 to 1.2 million tons.

Against the backdrop of these negative trends in Russia, the developed countries of the world over these 10 years, on the contrary, have increased the degree of state regulation in this area. In order to reduce the cost of products using waste, tax incentives were introduced. To attract investors to this area, a system of preferential loans has been created, in a number of countries restrictions are imposed on the consumption of products manufactured without the use of waste, and so on. The European Parliament has adopted a 5-year program to improve the use of secondary resources: in particular, paper and cardboard up to 55%.

According to some experts from industrialized countries, at present, from the point of view of the economy, it is advisable to process up to 56% of waste paper from the total amount of waste paper. About 35% of this raw material can be collected in Russia, while the rest of the waste paper, mainly in the form of household waste, ends up in a landfill, and therefore it is necessary to improve the system for collecting and harvesting it.

Modern technologies and equipment for the processing of waste paper make it possible to use it not only for the production of low-quality, but also high-quality products. Obtaining high-quality products requires the presence of additional equipment and the introduction of chemical auxiliary substances to improve the mass. This trend is clearly visible in the descriptions of foreign technological lines.

The production of corrugated cardboard is the largest consumer of waste paper and its main component is old cardboard boxes and boxes.

One of the decisive conditions for improving the quality of finished products, including strength indicators, is to improve the quality of raw materials: sorting waste paper by brand and improving its cleaning from various contaminants. The increasing degree of contamination of secondary raw materials adversely affects the quality of products. To increase the efficiency of using waste paper, it is necessary to match its quality to the type of products produced. So, container board, corrugating paper should be produced using waste paper, mainly MS-4A, MS-5B and MS-6B grades in accordance with GOST 10700, which ensure the achievement of high product performance.

In general, the rapid growth in the use of waste paper is due to the following factors:

Competitiveness of production of paper and cardboard from recycled raw materials;

Relatively high cost of wood raw materials, especially considering transportation;

Relatively low capital intensity of projects of new enterprises operating on waste paper, in comparison with enterprises using primary fibrous raw materials;

Ease of creating new small enterprises;

Increased demand for recycled paper and paperboard due to lower cost;

Government legislation (future).

It should be noted another trend in the field of waste paper processing - a slow decrease in its quality. For example, the quality of Austrian containerboard is constantly declining. Between 1980 and 1995, the bending stiffness of its middle layer decreased by an average of 13%. The systematic repeated return of the fiber to production makes this process almost inevitable.

1. Characteristics of raw materials, finished products

The characteristics of the feedstock are shown in Table 1.1.

Table 1.1. Brand type and composition of waste paper used for the production of paper for corrugating

Waste paper brand
	Kraft paper	Waste paper production: packaging twine, electrical insulating, cartridge, bag, abrasive base, adhesive tape base, and punched cards.
	Non-moisture resistant paper bags	Used bags without bituminous impregnation, interlayer, reinforced layers, as well as residues of abrasive and chemically active substances.
	Corrugated cardboard and packaging	Waste paper and cardboard production used in the production of corrugated cardboard, without printing, adhesive tape and metal inclusions, without impregnation, coating with polyethylene and other water-repellent materials.
	Corrugated cardboard and packaging	Wastes from the production and consumption of paper and cardboard used in the production of corrugated cardboard with printing without adhesive tape and metal inclusions, without impregnation, coating with polyethylene and other water-repellent materials.
	Corrugated cardboard and packaging	Waste paper and cardboard, as well as used corrugated packaging with printing without impregnation, coating with polyethylene and other water-repellent materials.

2. Selection and justification of the technological scheme of production

The formation of the paper web takes place on the wire table of the paper machine. The quality of the paper to a large extent depends on both the conditions of receipt on the grid and the conditions of its dehydration.

Characteristics of PM, composition.

In this course project, a mass preparation department for a paper machine producing paper for corrugating weighing 1 m 2 100 - 125 g, speed - 600 m / min, cutting width - 4200 mm, composition - 100% waste paper will be calculated.

Main design decisions:

UOT installation

Advantages: due to the repeated successive passage of waste from the first stage of cleaning through other stages, the amount of good fiber in the waste is reduced and the amount of heavy inclusions to the last stage of cleaning increases. Waste from the last stage is removed from the plant.

SVP-2.5 installation

Advantages:

· supply of the sorted suspension to the lower part of the body excludes hit of heavy inclusions in a sorting zone that prevents mechanical damages of a rotor and a sieve;

· heavy inclusions are collected in the collection of heavy waste and removed as they accumulate during sorting;

· in the sorting, a semi-closed rotor with special blades is used, which makes it possible to carry out the sorting process without water supply to dilute the waste;

· mechanical seals made of siliconized graphite are used in the sorting, which ensures high reliability and durability of both the seal itself and the bearing supports.

Parts of the screens that come into contact with the processed suspension are made of corrosion-resistant steel of the 12X18H10T type.

Installation of a hydrodynamic headbox with control of the transverse profile by a local change in the mass concentration

Advantages:

· the range of regulation of the mass of 1 m 2 of paper is greater than in conventional boxes;

· the mass of 1 m 2 of paper can be changed by sections by division of 50 mm, which improves the uniformity of the transverse profile of the paper;

· Zones of influence of regulation are clearly limited.

The method of making paper on flat-grid paper machines, despite the wide distribution and significant improvement in the equipment and technology used, is not without drawbacks. They were noticeably manifested when the machine was running at high speed, and such in connection with the increased requirements for the quality of the paper being produced. A feature of paper produced on flat-grid paper machines is a certain difference in the properties of its surfaces (versatility). The mesh side of the paper has a more pronounced mesh print on its surface and a more pronounced orientation of the fibers in the machine direction.

The main disadvantage of the conventional formation on one grid is that the water moves in only one direction and therefore there is an uneven distribution of fillers, small fibers across the thickness of the paper. In that part of the sheet that is in contact with the mesh, there is always less filler and fine fractions of fibers than on the opposite side. In addition, at machine speeds above 750 m/min, due to the action of the built-in air flow and the operation of the dewatering elements at the beginning of the wire table, waves and splashes appear on the stock loading mirror, which reduce product quality.

The use of dual wire forming devices is connected not only with the desire to eliminate the versatility of the produced paper. When using such devices, the prospects for a significant increase in the speed of the PM and productivity have opened up, because. at the same time, the speed of the filtered water and the filtration path are significantly reduced.

When using double-grid forming devices, such features are improved printing properties, reduced dimensions of the wire part and power consumption, simplified maintenance during operation, and a greater uniformity of the mass profile of 1 m 2 papers at a high speed of the PM. The Sim-Former forming device accepted in practice is a combination of a flat and two-wire machine. At the beginning of the formation of the paper web occurs due to the smooth removal of water on the forming board and subsequent single adjustable hydrobars and wet suction boxes. Its further molding takes place between two grids, where, first, above the arcuate surface of the waterproof molding shoe, water is removed through the upper grid, and then into suction boxes installed from below. This ensures a symmetrical distribution of fine fibers and filler in the cross section of the paper web and its surface properties on both sides are approximately the same.

In this course project, a flat mesh machine was adopted, consisting of: a console table, a chest, mesh-turning and mesh-guiding shafts, a suction couch shaft, a forming box, dehydrating elements (hydroplank, wet and dry suction boxes), scrapers, mesh straighteners, mesh stretchers, sprinkler systems, walkways service.

In the paper industry, the choice of cleaning and sorting equipment is also of great importance. Pollution of the fibrous mass has a different origin, shape and size. Depending on the density, the inclusions found in the mass are divided into three groups: with a density greater than the density of the fiber (metal particles, sand, etc.); with a density less than the density of the fiber (resin, air bubbles, oils, etc.); with a density close or equal to the density of the fiber (chips, bark, fire, etc.). The removal of the first two types of contaminants is the task of the cleaning process and is carried out at the FEP, etc. The separation of the third kind of inclusions is usually a task of the sorting process carried out in sorts of various types.

Cleaning of the mass at the FEP is carried out according to a three-stage scheme. Modern designs of FEP have a completely closed system, operate with backpressure at the waste outlet, when used in front of the paper machine, they are also equipped with devices for deaeration of the mass or work together.

Pressure screens are closed type screens with hydrodynamic blades used for such and coarse screening of pulp. A distinctive feature of this type of sorting is the presence of blades of a special profile designed for cleaning sieves.

Sorting type UZ - single-carrier with hydrodynamic blades, located in the zone of the sorted mass. These screens are mainly used for fine screening of UHC-cleaned stock immediately before the paper machine. Sorting type STsN are installed for sorting waste from the knotter.

3. Calculation of the material balance of water and fiber on a paper machine

Initial data for calculation

Corrugating Paper Composition:

Waste paper 100%

Starch 8 kg/t

The initial data for the calculation are presented in Table 3.1

Table 3.1. Input data for calculating the balance of water and fiber

Name of data	Value
1. Paper composition for corrugating, %
waste paper
2. Dryness of the paper web and mass concentration in the course of the technological process,%
waste paper coming from the pool of high concentration
in the receiving pool of waste paper
in the machine pool
in pressure overflow tank
at the third stage of centric cleaners
at the 2nd stage of centrikliners
waste after III stage of centric cleaners
waste after II stage of centric cleaners
waste after the 1st stage centric cleaners
knotter waste
vibration sorting waste
for vibration sorting
sorted mass from vibration sorting to the recycled water collector
in head box
after the preliminary dehydration section
after suction boxes
after couch shaft
cut-offs and marriage with couch-shaft
after the press part
marriage in the press
after the dryer
marriage in the drying part
marriage in decoration
after rolling
after slitting machine
in a couch mixer
in pulpers
reverse marriage after thickener

from the concentration regulator of the recycling pool
3. The amount of paper rejects from paper production, net, %

in finishing (from machine calender and rolling)
in the dryer
in the press section
cut-off and wet marriage with couch - shaft
4. The amount of sorting waste from the incoming mass,%
from knotter
from III stage centric cleaners
from II stage centric cleaners
5. Concentration of circulating water %
from couch shaft
from the press part, squeezed water into the drain
from the press part, water from washing the felts into the drain
from suction boxes
from the pre-drainage area to the under-grid water collector
from the preliminary dehydration section to the recycled water collector
from the thickener to the surplus recycled water collector
6. Mass overflow,%
from the headbox
from pressure overflow tank
7. Cellulose consumption per sublayer, kg
8. The degree of fiber trapping on the disc filter,%
9. Consumption of fresh water, kg
for defoaming in the headbox


for mesh washing
for washing cloths
for cutoffs
to the thickener

Longitudinal - cutting machine

Freewheel b/m

dry marriage in pulper

The amount of dry waste is 1.8% of the net output, i.e.

Check substance water mass

consumption: to the warehouse 930.00 70.00 1000.00

marriage 16.74 1.26 18.00

Total 946.74 71.26 1018.00

arrival: rewind 946.74 71.26 1018.00

Machine calender and reel (finishing)

dry marriage in pulper

The amount of dry marriage from the calender and reel is 1.50% of the net output, i.e.

Check substance water mass

Total 960.69 72.31 1033.00

Drying part

from the press section

The amount of dry rejects is 1.50% of the net output, i.e.

Check substance water mass

consumption: per calender 960.69 72.31 1033.00

Total 974.64 1329.47 2304.11

We accept that the dryness of the cloths after washing does not change, then with a content of 0.01% fiber in the drains, their total mass will be 4000.40 kg. Fiber loss with these waters is 4000.40-4000=0.4 kg.

Wet scrap from the couch shaft is 1.00% of the net output,

those. at 7.00% humidity

The cutoffs are 1.00% of the net output, i.e.

at 7.00% humidity

on the couch shaft

for suction boxes

The overflow into the under-grid water collector is 10.00% of the incoming mass,

The amount of waste from the knotter is 3.50% of the incoming mass, i.e.

Waste dilution unit for vibration sorting

The amount of waste from vibration sorting is 3.00% of the incoming mass, i.e.

We accept the amount of waste from the III stage of FEP - 2.00 kg. Waste from the III stage of FEP is 5.00% of the incoming fiber

The concentration of recycled water in the collection

Waste from the II stage of FEP is 5.00% of the incoming fiber, i.e.

to the II stage of the UOT

on the knotter

on the I step

Check substance water mass

Overflow is 10.00% of the incoming mass, i.e.

into the pulse mill

into a marriage thickener

in the pool of wet marriage

because then

The degree of fiber capture on the disc filter is 90%, i.e.

on the concentration regulator of the recycled marriage pool

into the composite pool

into pressure overflow tank

machine pool

We calculate starch, with a concentration of 10 g / l

B 4 =800 - 8=792kg

In table. 3.2 shows the consumption of clarified water.

Table 3.2. Clarified water consumption (kg/t)

The excess of clarified water is

Fiber loss with clarified water is

The summary balance of water and fiber is presented in Table. 3.3.

Table 3.3. Summary table of water and fiber balance

Items of income and expense

Fiber + chemical composition (absolutely dry matter):
waste paper
Cellulose per sublayer

finished paper
Fiber with water from presses
Vibration sorting waste
Waste from III stage of centrikliners
Fiber with clarified water


with waste paper
with cellulose on the sublayer
with starch glue
for washing cloth
for cutoffs
for sealing the vacuum chambers of the couch shaft
for sealing suction boxes
for mesh cleaning
for defoaming
to the thickener
in finished paper
evaporates when dry
from presses
with waste from vibration sorting
with waste from the III stage of centrikliners
clarified water

The irretrievable loss of fiber is

Wash fiber is

The consumption of fresh fiber per 1 ton of net paper is 933.29 kg of absolutely dry (waste paper + cellulose per sublayer) or air-dry fiber, including cellulose - .

4. Calculation of stock preparation department and machine performance

Calculations for the mass preparation department of the paper machine producing paper for corrugating:

Weight 1m 2 100-125g

Speed b/m 600 m/min

Cutting width 4200 mm

Composition:

Waste paper - 100%

The maximum calculated hourly productivity of the machine in continuous operation.

B n - the width of the paper web on the reel, m;

V - maximum operating speed, m/min;

q - maximum weight of 1m 2 paper, g / m 2;

0.06 - multiplier for converting minute speed into hourly speed and paper weight.

Maximum calculated output of the machine (gross output) during continuous operation per day

Average daily machine output (net output)

K eff - coefficient of efficiency of machine use

K EF \u003d K 1 K 2 K 3 \u003d 0.76 where

To 1 - the coefficient of use of the working time of the machine; at V<750 = 0,937

K 2 - coefficient taking into account the marriage on the machine and the idling of the machine, \u003d 0.92

K 3 - technological coefficient of use of the maximum speed of the machine, taking into account its fluctuations associated with the quality of semi-finished products and other technological factors, for mass types of paper = 0.9

Annual productivity of the machine

thousand tons/year

We calculate the capacity of the pools based on the maximum amount of mass to be stored, the required storage time of the mass in the pool.

where M is the maximum amount of mass;

P H - hourly productivity;

t - mass storage time, h;

K - coefficient taking into account the incompleteness of filling the pool = 1.2.

High concentration pool volume

Composite pool volume

Receiving basin volume

Machine pool volume

The volume of the wet reject pool

Dry waste basin volume

The volume of the reverse marriage pool

The characteristics of the pools are shown in table 4.1.

Table 4.1. Characteristics of the pools

For the correct choice of the type and kind of grinding equipment, it is necessary to take into account the influence of factors: the place of the grinding apparatus in the technological scheme, the type and nature of the grinding material, the concentration and temperature of the mass.

For the processing of dry rejects, a pulper with the required maximum capacity is installed (80% of the net output on the machine)

349.27 H 0.8= 279.42 t

We accept GRVn-32

For marriage from the finish, a hydraulic pulper GRVn-6 is installed

Specifications are shown in table 4.2.

Table 4.2. Technical characteristics of pulpers

Cleaning plants

We accept UOT 25 at the first stage

Specifications are shown in table 4.3

Table 4.3. Technical characteristics of UOT

knotter

We accept SVP-2.5 with a capacity of 480-600 tons / day, technical characteristics are indicated in table 4.4

Table 4.4. Technical specifications

Parameter
Mass productivity according to w.s.v. sorted suspension, t/day, at the mass concentration of the incoming suspension:



The area of the side surface of the sieve drum, m 2
Electric motor power, kW
Nominal passage of branch pipes DN, mm:
Suspension supply
Suspension withdrawal
Removal of light inclusions

vibration sorting

We accept VS-1.2 productivity 12-24 t/day

Specifications are shown in table 4.5.

Table 4.5. Technical specifications

Parameter
Mass productivity according to w.s.v. sorted suspension (paper pulp sorting waste with a sieve hole diameter of 2 mm), t/day
Mass concentration of the incoming suspension, g/l
Sieve area, m 2
Electric motors: - quantity - power, kW
Nominal passage of nozzles DN, mm: - supply of the suspension - removal of the sorted suspension
Overall dimensions, mm



Weight, kg

Calculation of centrifugal pumps

High Concentration Pool Pump:

receiving basin pump:

composite pool pump:

machine basin pump:

wet marriage pool pump:

dry reject pool pump:

mixing pump #1:

mixing pump #2:

mixing pump no. 3:

under-grid water collector pump:

circulating water collector pump:

couch mixer pump:

The main technical and economic indicators of the workshop

Electricity consumption kW/h…………………………………………………………………. .......275

Steam consumption for drying, t……………………………………………3.15

Fresh water consumption, m 3 / t…………………………………………23

water fiber paper machine

List of information sources used

1. Technology of paper: lecture notes / Perm. state tech. un-t. Perm, 2003. 80s. R.H. Khakimov, S.G. Ermakov

2. Calculation of the balance of water and fiber on a paper machine / Perm. state tech. un-t. Perm, 1982. 44 p.

3. Calculations for the mass preparation department of a paper mill / Perm. state tech. un-t. Perm, 1997

4. Paper technology: guidelines for course and diploma design / Perm. state tech. un-t. Perm, 51s., B.V. Sharks

Similar Documents

paper machine performance. Calculation of semi-finished products for paper production. Choice of grinding equipment and equipment for recycle processing. Calculation of the capacity of pools and mass pumps. Preparation of a suspension of kaolin.

term paper, added 03/14/2012

Characteristics of feedstock, chemicals for the production of chemical-mechanical mass. Selection, justification and description of the technological scheme of production. Calculation of the balance of water, fiber. Drawing up a work plan. Calculation of profit, profitability, capital productivity.

thesis, added 08/20/2015

Development of a technological scheme for the production of high-quality tableware. Classification and assortment of crystal products. Characteristics of raw materials, justification of the chemical composition and calculation of the charge, material balance, equipment. Quality control of finished products.

term paper, added 03/03/2014

The modern composition of technological processes of oil refining in the Russian Federation. Characteristics of the initial raw materials and finished products of the enterprise. Selection and justification of the oil refining option. Material balances of technological installations. Consolidated commodity balance.

term paper, added 05/14/2011

Historical overview of the development of the wallpaper industry. Description of the projected production, finished products. Implementation of the size press "Sim-Sizer" on PM. Calculation of the consumption of raw materials, chemicals, water balance, fiber, production program of the shop.

thesis, added 03/22/2011

Characteristics of the finished product and description of the technological scheme of its production. Calculation of hourly, shift, daily and annual productivity, material requirements. The choice of the necessary equipment, the development of a schematic diagram of the layout.

term paper, added 12/04/2016

Automation of the electric drive (AED) of the press section of the paper machine. Technological process: selection and calculation of AED, selection of a complex of hardware and software. Development of a human-machine interface scheme; mathematical description.

term paper, added 04/10/2011

Principles of placing a skin-canning shop at meat processing enterprises. Selection and justification of the basic technological scheme of production. Calculation of raw materials, finished products. Skin defects. Organization of production accounting and conservation control.

term paper, added 11/27/2014

Description of the technological scheme of the grid table. Calculation of the possible productivity of a paper machine (PM). Installation and technical operation of the wire part of the PM. Calculation of design parameters of a box with hydroplanks and a wet suction box.

thesis, added 06/06/2010

Description of the basic technological scheme of the booster pumping station. The principle of operation of the DNS with the installation of preliminary water discharge. Settling tanks for oil emulsions. Material balance of separation stages. Calculation of the material balance of water discharge.

Calculation of fresh semi-finished products

As an example, the stock preparation department of a newsprint mill was calculated according to the composition specified in the water and fiber balance calculation, i.e. semi-bleached sulphate pulp 10%, thermomechanical pulp 50%, ground wood pulp 40%.

The consumption of air-dry fiber for the production of 1 ton of net paper is calculated based on the balance of water and fiber, i.e. the consumption of fresh fiber per 1 ton of newsprint net is 883.71 kg of absolutely dry (cellulose + DDM + TMM) or 1004.22 kg of air-dry fiber, including cellulose - 182.20 kg, DDM - 365.36 kg, TMM - 456.66 kg.

To ensure the maximum daily productivity of one paper machine, the consumption of semi-finished products is:

cellulose 0.1822 440.6 = 80.3 t;

DDM 0.3654 440.6 = 161.0 t;

TMM 0.4567 440.6 = 201.2 tons.

To ensure the daily net productivity of one paper machine, the consumption of semi-finished products is:

cellulose 0.1822 334.9 = 61 t;

DDM 0.3654 334.9 = 122.4 t;

ТММ 0.4567 334.9 = 153.0 t.

To ensure the annual productivity of the paper machine, the consumption of semi-finished products, respectively, is:

pulp 0.1822 115.5 = 21.0 thousand tons

DDM 0.3654 115.5 = 42.2 thousand tons;

ТММ 0.4567 115.5 = 52.7 thousand tons

To ensure the annual productivity of the factory, the consumption of semi-finished products is respectively:

pulp 0.1822 231 = 42.0 thousand tons

DDM 0.3654 231 = 84.4 thousand tons;

ТММ 0.4567 231 = 105.5 thousand tons.

In the absence of a calculation of the balance of water and fiber, the consumption of fresh air-dry semi-finished product for the production of 1 ton of paper is calculated by the formula: 1000 - V 1000 - V - 100 W - 0.75 K

RS = + P + OM, kg/t, 0.88

where B is the moisture contained in 1 ton of paper, kg; Z - ash content of paper,%; K - rosin consumption per 1 ton of paper, kg; P - irretrievable loss (wash) of 12% moisture fiber per 1 ton of paper, kg; 0.88 - conversion factor from absolutely dry to air-dry state; 0.75 - coefficient taking into account the retention of rosin in paper; RH - loss of rosin with recycled water, kg.

Calculation and selection of grinding equipment

The calculation of the number of grinding equipment is based on the maximum consumption of semi-finished products and taking into account the 24-hour duration of the equipment operation per day. In this example, the maximum consumption of air-dry pulp to be milled is 80.3 tons/day.

Method of calculation No. 1.

1) Calculation of disk mills of the first stage of grinding.

For pulp refining at high concentration according to the tables presented in“Equipment for pulp and paper production” (Handbook for students special 260300 “Technology of chemical processing of wood” Part 1 / Compiled by F.Kh. Khakimov; Perm. State Technical University Perm, 2000. 44 p. .) mills of the MD-31 brand are accepted. Specific load on the knife edge Вs= 1.5 J/m. At the same time, the second cutting length Ls, m/s, is 208 m/s (Section 4).

Effective grinding power Ne, kW, is equal to:

N e = 103 Вs Ls j = 103 1.5 . 0.208 1 = 312 kW,

where j is the number of grinding surfaces (for a single-disk mill j = 1, for a double mill j = 2).

Mill performance MD-4Sh6 Qp, t/day, for the accepted grinding conditions will be:

where qe=75 kWh/t specific useful energy consumption for refining sulphate unbleached pulp from 14 to 20 °SR (Fig. 3).

Then the required number of mills for installation will be equal to:

The productivity of the mill varies from 20 to 350 tons/day, we accept 150 tons/day.

We accept two mills for installation (one in reserve). Nxx = 175 kW (section 4).

Nn \u003d Ne + Nxx= 312 + 175 = 487 kW.

K Nn> Ne+Nxx;

0,9.630 > 312 + 175; 567 > 487,

2) Calculation of mills of the second stage of grinding.

For grinding cellulose at a concentration of 4.5%, mills of the MDS-31 brand are accepted. Specific load on the knife edge Вs\u003d 1.5 J / m. The second cutting length is taken according to Table. fifteen: Ls\u003d 208 m / s \u003d 0.208 km / s.

Effective grinding power Ne, kW, will be equal to:

Ne \u003d Bs Ls \u003d 103 1.5. 0.208 1 = 312 kW.

Specific electricity consumption qe, kWh/t, for pulp refining from 20 to 28°ShR according to the schedule will be (see Fig. 3);

qe = q28 - q20= 140 - 75 = 65 kWh/t.

Mill performance Qp, t/day, for the accepted working conditions will be equal to:

Then the required number of mills will be:

Nxx = 175 kW (section 4).

Power consumed by the mill Nn, kW, for the accepted grinding conditions will be equal to:

Nn \u003d Ne + Nxx= 312 + 175 = 487 kW.

Checking the power of the drive motor is carried out according to the equation:

K Nn> Ne+Nxx;

0,9.630 > 312 + 175;
567 > 487,

therefore, the motor test condition is satisfied.

Two mills are accepted for installation (one in reserve).

Method of calculation No. 2.

It is expedient to calculate the grinding equipment according to the above calculation, however, in some cases (due to the lack of data on the selected mills), the calculation can be carried out according to the formulas below.

When calculating the number of mills, it is assumed that the grinding effect is approximately proportional to the energy consumption. Electricity consumption for pulp milling is calculated by the formula:

E=e Pc (b-a), kWh/day,

where e? specific electricity consumption, kWh/day; PC? the amount of air-dry semi-finished product to be ground, t; a? the degree of grinding of the semi-finished product before grinding, oShR; b? the degree of grinding of the semi-finished product after grinding, oShR.

The total power of the electric motors of grinding mills is calculated by the formula:

where h? load factor of electric motors (0.80?0.90); z? number of mill hours per day (24 hours).

The power of the electric motors of the mills according to the grinding stages is calculated as follows:

For the 1st grinding stage;

For the 2nd grinding stage,

where X1 and X2? distribution of electricity to the 1st and 2nd stages of grinding, respectively, %.

The required number of mills for the 1st and 2nd grinding stages will be: technological paper machine pump

where N1M and N2M? power of the electric motors of the mills to be installed at the 1st and 2nd grinding stages, kW.

In accordance with the accepted technological scheme, the grinding process is carried out at a concentration of 4% up to 32 oShR in disc mills in two stages. The initial degree of grinding of semi-bleached sulphate softwood pulp is accepted as 13 OSR.

According to practical data, the specific energy consumption for grinding 1 ton of bleached softwood sulphate pulp in conical mills will be 18 kWh/(t chr). The calculation assumes a specific energy consumption of 14 kWh/(t oShR); since the grinding is designed in disc mills, is the energy savings taken into account? 25%.

The total amount of electricity required for grinding will be:

E \u003d 14 80.3 (32-13) \u003d 21359.8 kWh / day.

To ensure this power consumption, it is necessary that the total power of the electric motors installed for grinding mills is:

The power consumption of the grinding stages is distributed in accordance with the properties of the semi-finished product being ground and the type of finished product. In the example under consideration, the paper composition includes 40% wood pulp and 50% thermomechanical pulp, so the nature of the grinding of sulfate softwood pulp should be without shortening the fiber at a sufficiently high degree of fiber fibrillation. Based on this, it is advisable to provide 50% of the power for the 1st and 2nd stages of grinding softwood pulp. Therefore, at the 1st stage of grinding, the total power of the electric motors of the mills should be:

N1=N2=1047 0.5=523.5 kW .

The project provides for the installation of mills MD-31 with a power of 630 kW electric motors, which differ in the nature of the headset at the 1st and 2nd stages. The required number of mills for the 1st or 2nd stage of grinding will be:

Taking into account the reserve, it is necessary to provide 4 mills (there is a reserve mill at each stage).

Based on the productivity of the MD-31 mill (up to 350 t/day), the amount of fiber that must be passed through the mills (80.3 t/day), the amount of increase in the degree of grinding that must be provided (19 OSR), a conclusion was made about the installation mills in series.

According to the technological scheme, the mass preparation department provides for the installation of an MP-03 pulsation mill for the dissolution of recycled marriage.

The number of pulse mills is calculated using the following formula:

where QP.M. ? performance of the pulse mill, t/day;

BUT? the amount of absolutely dry fiber entering the pulse mill, kg / t.

The main parameters of the mills provided for installation are given in Table. one

Table 1 - Main parameters of installed mills

Note. Overall dimensions of the MP-03 mill: 244.5×70.7×76.7 cm.

Calculation of the volume of pools

The calculation of the volume of the pools is based on the maximum amount of mass to be stored and the required storage time of the mass in the pool. According to Giprobum's recommendations, pools should be designed for 6-8 hours of mass storage.

As a rule, the duration of storage of semi-finished products before and after grinding is accepted? 2 ... 4 hours, and paper pulp in the composite (mixing) and machine pool? 20?30 min. In some cases, it is planned to store semi-finished products before grinding in towers of high concentration (12 ... 15%), calculated for a 15 ... 24-hour supply. Stock times can be reduced by using modern automation systems.

The calculation of the volume of pools is made according to the formula:

The calculation of the volume of pools is also carried out according to the formula (if there is a calculation of the balance of water and fiber):

where QN.BR. ? hourly productivity of PM (KDM), t/h; QM? the amount of fibrous suspension in the pool, m3/t of paper; t- mass storage time, h; To- coefficient taking into account the incomplete filling of the pool (usually To =1,2).

The time for which the mass reserve is calculated in a pool of a certain volume is calculated by the formula:

where P V? pool volume, m3; with? humidity of air-dry fibrous material, % (in accordance with GOST for semi-finished products with= 12%, for paper and cardboard with = 5?8 %); t? mass storage time; z c? concentration of fibrous suspension in the pool, %; k? coefficient taking into account the incompleteness of the pool (usually k = 1,2).

The volumes of the pools provided for in the considered technological scheme are calculated as follows (for one machine):

Pulp receiving basin

For example, let's take a calculation using the second formula:

receiving pool for DDM

receiving basin for TMP

pulp pool

intermediate basin for DDM

intermediate basin for TMP

composite pool

machine pool

The volume of pools for reverse marriage is calculated in case of emergency operation of the machine (50 or 80% of QSUT.BR).

The volume of the wet marriage pool:

The volume of the pool for dry marriage:

The volume of pools for recycled scrap is calculated for a total storage capacity of 4 hours. If a pool for recycled scrap from pulpers is provided in the machine room, the duration of storage of dissolved recycled scrap in the pools installed in the mass preparation department can be reduced.

The volume of the pool for reverse marriage:

For water collectors, we accept the storage time: for a collector of under-grid water, 5 minutes, i.e. 5: 60 = 0.08 h; for the collection of recycled water 15 min; for excess circulating water collector 30 min.

Undergrid water collector

Collector of recycled water

Collection of excess recycled water

Clarified water collection

The volumes of pools must be unified in order to facilitate their manufacture, layout, operation and repair. It is desirable to have no more than two sizes. The results of unification should be presented in the form of a table. 2

Table 2 - Results of unification of basins

Purpose of the pool	By calculation	After unification	Type of circulation device	Power of the electric motor of the central control unit, kW
	stock time, h		stock time, h

Receiving pools: cellulose


ground pulp
Intermediate pools:


Pools: compositional
machine
wet marriage
dry marriage
negotiable marriage
Collections: undergrid water
recycled water
excess recycled water
clarified water

For the factory, the number of pools obtained is doubled.

1) Kaolin slurry collector

2) Collector for dye solution

3) Collector for PAA solution

4) Collector for alumina solution

Calculation and selection of mass pumps

The choice of the pump is made on the basis of the total pressure of the mass, which the pump must create, and its performance. Calculation of the total head of the pump should be carried out after the layout drawings have been completed and the exact location of the pump has been determined. In this case, it is necessary to draw up a pipeline diagram indicating their length and all local resistances (tee, transition, branch, etc.). The principle of calculating the required pressure, which the pump must create, and the value of the local resistance coefficients are given in the special literature. Typically, to move fibrous suspensions within the mass preparation department, the pump must provide a head of 15–25 m.

Pump performance is calculated by the formula:

where P? the amount of air-dry fibrous material, t/day; with? humidity of air-dry fibrous material, %; z? number of working hours per day (24 hours); c/? concentration of fibrous suspension in the pool, %; 1.3? coefficient taking into account the pump performance margin.

The volumetric flow rate of the liquid pumped by the pump at a concentration of 1 ... 4.5 can also be determined from the calculation of the balance of water and fiber.

Qm=M. pH 1.3,

where pH- hourly productivity of the paper machine, t/h;

M- mass of pumped fibrous suspension (from the balance of water and fiber), m3.

Pump calculation

Mass pumps

1) Pump feeding pulp to disc mills

Qm=M. pH 1.3 = 5.012 18.36 1.3 = 120 m3/h.

We accept for installation the BM 125/20 pump with the following characteristic: supply? 125 m3/h; pressure? 20 m; limiting concentration of the final mass? 6%; power? 11 kW; rotation frequency? 980 rpm; efficiency ? 66%. A reserve is provided.

2) Pump supplying DDM from the receiving basin to the intermediate

Qm=M. pH 1.3 \u003d 8.69 18.36 1.3 \u003d 207 m3 / h.

3) Pump supplying TMP from the receiving pool to the intermediate

Qm=M. pH 1.3 \u003d 10.86 18.36 1.3 \u003d 259 m3 / h.

4) Pump supplying pulp from the ground pulp pool to the composite one

Qm=M. pH 1.3 \u003d 2.68 18.36 1.3 \u003d 64 m3 / h.

5) Pump supplying DDM from the intermediate basin to the composite one

Qm=M. pH 1.3 = 8.97 18.36 1.3 = 214 m3/h.

We accept for installation the BM 236/28 pump with the following characteristic: supply? 236 m3/h; pressure? 28 m; limiting concentration of the final mass? 7%; power? 28 kW; rotation frequency? 980 rpm; efficiency ? 68%. A reserve is provided.

6) Pump supplying TMP from the intermediate pool to the composite one

Qm=M. pH 1.3 \u003d 11.48 18.36 1.3 \u003d 274 m3 / h.

We accept for installation the BM 315/15 pump with the following characteristic: supply? 315 m3/h; pressure? 15 m; limiting concentration of the final mass? eight %; power? 19.5 kW; rotation frequency? 980 rpm; efficiency ? 70%. A reserve is provided.

7) Pump supplying paper pulp from the composite pool to the machine

Qm=M. pH 1.3 = 29.56 18.36 1.3 = 705 m3/h.

8) Pump supplying paper pulp from the machine pool to the MCR

Qm=M. pH 1.3 = 32.84 18.36 1.3 = 784 m3/h.

We accept for installation the BM 800/50 pump with the following characteristic: supply? 800 m3/h; pressure? 50 m; limiting concentration of the final mass? eight %; power? 159 kW; rotation frequency? 1450 rpm; efficiency ? 72%. A reserve is provided.

9) Pump supplying paper pulp from the dry reject pool to the recycled reject pool

Qm=M. pH 1.3 = 1.89 18.36 1.3 = 45 m3/h.

We accept for installation the pump BM 67 / 22.4 with the following characteristic: supply? 67 m3/h; pressure? 22.5 m; limiting concentration of the final mass? 4 %; power? 7 kW; rotation frequency? 1450 rpm; efficiency ? 62%. A reserve is provided.

10) Pump supplying paper pulp from the wet reject pool to the recycled reject pool

Qm=M. pH 1.3 \u003d 0.553 18.36 1.3 \u003d 214 m3 / h.

11) Pump supplying paper stock from the recycled waste pool to the composite one

Qm=M. pH 1.3 \u003d 6.17 18.36 1.3 \u003d 147 m3 / h.

We accept for installation the BM 190/45 pump with the following characteristic: supply? 190 m3/h; pressure? 45 m; limiting concentration of the final mass? 6%; power? 37 kW; rotation frequency? 1450 rpm; efficiency ? 66%. A reserve is provided.

12) Pump that feeds ground pulp through the sublayer

Qm=M. pH 1.3=2.5 18.36 1.3 = 60 m3/h.

13) A pump that delivers marriage from a couch mixer

Qm=M. pH 1.3 = 2.66 18.36 1.3 = 64 m3/h.

14) Pump supplying marriage from the couch mixer (in case of emergency operation of the machine)

15) The pump that feeds the waste from the pulper under the freewheel(In the calculation, pulpers No. 1 and 2 are combined, therefore, we calculate the approximate mass attributable to this pulper 18.6 kg a.d.w. x 2 = 37.2 kg, 37.2 x 100/3 = 1240 kg = 1.24 m3)

Qm=M. pH 1.3 = 1.24 18.36 1.3 = 30 m3 / h.

16) Pump supplying scrap from the pulper under the freewheel (in case of emergency operation of the machine)

We accept for installation the BM 475/31.5 pump with the following characteristic: supply? 475 m3/h; pressure? 31.5 m; limiting concentration of the final mass? eight %; power? 61.5 kW; rotation frequency? 1450 rpm; efficiency ? 70%. A reserve is provided.

17) Pump supplying marriage from the pulper (under the PRS)(In the calculation, pulpers No. 1 and 2 are combined, therefore, we calculate the approximate mass per this pulper 18.6 kg (a.d.w.) x 100/3 = 620 kg = 0.62 m3)

Qm=M. pH 1.3 = 0.62 18.36 1.3 = 15 m3/h.

We accept for installation the BM 40/16 pump with the following characteristic: supply? 40 m3/h; pressure? 16 m; limiting concentration of the final mass? 4 %; power? 3 kW; rotation frequency? 1450 rpm; efficiency ? 60%.

Mixing pumps

1) Mixing pump #1

Qm=M. pH 1.3 \u003d 332.32 18.36 1.3 \u003d 7932 m3 / h.

We accept for installation the pump BS 8000/22 with the following characteristic: supply? 8000 m3/h; pressure? 22 m; power? 590 kW; rotation frequency? 485 rpm; efficiency ? 83%; weight? 1400.

2) Mixing pump #2

Qm=M. pH 1.3 \u003d 74.34 18.36 1.3 \u003d 1774 m3 / h.

We accept for installation the pump BS 2000/22 with the following characteristic: supply? 2000 m3/h; pressure? 22 m; power? 160 kW; rotation frequency? 980 rpm; efficiency ? 78%.

3) Mixing pump #3

Qm=M. pH 1.3 = 7.6 18.36 1.3 = 181 m3/h.

We accept for installation the pump BS 200/31.5 with the following characteristic: supply? 200 m3/h; pressure? 31.5 m; power? 26 kW; rotation frequency? 1450 rpm; efficiency ? 68%.

Water pumps

1) A pump that supplies recycled water for diluting waste after sorting, rejects into a couch mixer, pulpers (about 8.5 m3 according to the balance). A reserve is provided.

Qm=M. pH 1.3=8.5 18.36 1.3 = 203 m3/h.

We accept for installation the pump K 290/30 with the following characteristic: supply? 290 m3/h; pressure? 30 m; power? 28 kW; rotation frequency? 2900 rpm; efficiency ? 82%.

2) Pump supplying clarified water to concentration regulators (according to balance, approximately 3.4 m3)

Qm=M. Рн 1.3=3.4 18.36 1.3 = 81 m3/h.

We accept for installation the pump K 90/35 with the following characteristic: supply? 90 m3/h; head 35 m; power? 11 kW; rotation frequency? 2900 rpm; efficiency ? 77%. A reserve is provided.

3) Fresh water supply pump (balance approx. 4.23 m3)

Qm=M. pH 1.3 \u003d 4.23 18.36 1.3 \u003d 101 m3 / h.

We accept for installation the pump K 160/30 with the following characteristic: supply? 160 m3/h; pressure? 30 m; power? 18 kW; rotation frequency? 1450 rpm; efficiency ? 78%. A reserve is provided.

4) The pump for supplying fresh filtered water to the showers of the screen table and the press section (according to the balance of about 18 m3)

Qm=M. pH 1.3=18 18.36 1.3 = 430 m3/h.

We accept for installation the pump D 500/65 with the following characteristic: supply? 500 m3/h; pressure? 65 m; power? 130 kW; rotation frequency? 1450 rpm; efficiency ? 76%. A reserve is provided.

5) Pump for supplying excess circulating water to the disc filter(according to the balance approximately 40.6 m3)

Qm=M. pH 1.3 \u003d 40.6 18.36 1.3 \u003d 969 m3 / h.

5) Pump for supplying excess clarified water for use(according to balance approximately 36.3 m3)

Qm=M. pH 1.3 \u003d 36.3 18.36 1.3 \u003d 866 m3 / h.

We accept for installation the pump D 1000/40 with the following characteristic: supply? 1000 m3/h; pressure? 150 m; power? 150 kW; rotation frequency? 980 rpm; efficiency ? 87%. A reserve is provided.

Chemical pumps

1) Kaolin slurry pump

Qm=M. pH 1.3 = 0.227 18.36 1.3 = 5.4 m3/h.

2) Dye solution pump

Qm=M. pH 1.3=0.02 18.36 1.3 = 0.5 m3/h.

We accept for installation the pump X2 / 25 with the following characteristic: supply? 2 m3/h; pressure? 25 m; power? 1.1 kW; rotation frequency? 3000 rpm; efficiency ? fifteen %. A reserve is provided.

3) PAA solution pump

Qm=M. pH 1.3=0.3 18.36 1.3 = 7.2 m3/h.

We accept for installation the pump X8 / 18 with the following characteristic: supply? 8 m3/h; pressure? 18 m; power? 1.3 kW; rotation frequency? 2900 rpm; efficiency ? 40%. A reserve is provided.

3) Alumina solution pump

Qm=M. pH 1.3 = 0.143 18.36 1.3 = 3.4 m3/h.

We accept for installation the pump X8 / 18 with the following characteristic: supply? 8 m3/h; pressure? 18 m; power? 1.3 kW; rotation frequency? 2900 rpm; efficiency ? 40%. A reserve is provided.

Recycling marriage

Calculation of the volume of the couch mixer

We accept the storage time in the couch-mixer in emergency mode 3 min; the mixer should be designed for 50…80% of the machine’s productivity (in this case, the concentration increases to 3.0…3.5%):

We accept for installation a couch-mixer with a volume of 16 ... 18 m3 of CJSC Petrozavdskmash with the following characteristics: with working bodies on a horizontal shaft, the number of propellers? 4 things.; propeller diameter? 840 mm; rotor speed? 290…300 min-1; electric motor power 75…90 kW.

Calculation of pulpers

For the processing of dry rejects, a pulper is installed (under the reel) with the required maximum capacity (80% of the net output on the machine)

334.9 0.8 = 268 t/day.

We choose the GRVm-32 pulper with the following characteristics: performance? 320 t/day; motor power? 315 kW; tub capacity? 32 m2; sieve hole diameter? 6; 12; 20; 24 mm.

For marriage from finishing (according to the balance 2% of the net output)

334.9 0.02 = 6.7 t/day.

We choose the GDV-01 pulper with the following characteristics: productivity? 20 t/day; motor power? 30 kW; rotor speed? 370 rpm; tub diameter? 2100 mm; rotor diameter? 2100 mm.

marriage thickener

To thicken wet recycled waste, we use the SG-07 thickener with the following characteristics:

Sorting and cleaning equipment

Calculation of knotters

Number of knotters n is determined by the formula:

where RS.BR.- daily productivity of the paper machine, gross, t/day;

BUT- the amount of absolutely dry fiber supplied for cleaning, per ton of paper (taken from the calculation of water and fiber), kg / t;

Q- productivity of the knotter for air-dry fiber, t/day.

We accept for installation 3 screens (one in reserve) of the Ahlscreen H4 type with the following characteristics: performance? 500 t/day; motor power? 55 kW; rotor speed? 25 s-1; sealing water consumption? 0.03 l/s; sealing water pressure? 10% higher than mass inlet pressure; maximum inlet pressure? 0.07 MPa.

Vibration sorting calculation

We accept for installation 1 vibration sorting type SV-02 with the following characteristic: productivity? 40 t/day; motor power? 3 kW; sieve hole diameter? 1.6...2.3 mm; sieve oscillation frequency? 1430 min-1; length? 2.28 m; width? 2.08 m; height? 1.06 m

Calculation of cleaners

Vortex cleaner installations are assembled from a large number of individual tubes connected in parallel. The number of tubes depends on the capacity of the plant:

where Q- installation productivity, dm3/min;

Qt- productivity of one tube, dm3/min.

The productivity of the installation is determined according to the calculation of the material balance of water and fiber.

where R- hourly productivity of the machine, kg/h;

M- mass of fibrous suspension supplied for treatment (from the balance of water and fiber), kg/t;

d is the density of the fibrous suspension (when the mass concentration is less than 1%, d = 1 kg/dm3), kg/dm3.

1st cleaning stage

dm3/min.= 1695 l/s.

We accept for installation 4 blocks of Ahlcleaner RB 77 cleaners, each block has 104 pcs. cleaners. Dimensions of the 1st block: length 4770 mm, height - 2825, width - 1640 mm.

2nd cleaning stage

dm3/min.= 380 l/s.

We calculate the number of purifier tubes if the throughput of one tube is 4.2 l / s.

We accept for installation 1 block of Ahlcleaner RB 77 cleaners, the block includes 96 pcs. cleaners. Dimensions of the 1st block: length 4390 mm, height - 2735, width - 1500 mm.

3rd stage cleaning

dm3/min.= 39 l/s.

We calculate the number of purifier tubes if the throughput of one tube is 4.2 l / s.

We accept for installation 1 block of Ahlcleaner RB 77 cleaners, the block includes 10 pcs. cleaners. Dimensions of the 1st block: length 1980 mm, height - 1850, width - 860 mm.

The cleaning system is equipped with a deaeration tank with a diameter of 2.5 m and a length of 13 m. generated by a system consisting of a steam ejector, a condenser and a vacuum pump.

Disc filter

Disc filter performance Q, m 3 / min, is determined by the formula:

Q=F. q,

where F- filtration area, m2;

q- capacity, m3/m2 min.

Then the required number of filters will be determined:

where Vmin- the volume of excess water supplied for treatment, m3/min.

It is necessary to pass 40583 kg of recycled water or 40.583 m3 through the disc filter, let's determine the volume of excess water

40.583 18.36 = 745 m3/h=12.42 m3/min.

Q \u003d 0.04 434 \u003d 17.36 m 3 / min.

We accept for installation a Hedemora VDF disk filter, type 5.2 with the following characteristics: 14 disks, length 8130 mm, empty filter weight 30.9 t, working weight 83 t.

Basic calculations for the mass preparation department. Equipment for the preparation and production of paper pulp Calculation of the capacity of the thickener for the production of paper pulp

Paper pulp thickeners in St. Petersburg

Similar Documents

Report a typo

Text to be sent to our editors:

Your comment (optional):