SU1601263A1 - Method of controlling the process of regeneration of liquors in sulfate pulp production - Google Patents

Abstract

The invention relates to methods for controlling the process of regenerating liquors in causticization plants, widely used in the pulp and paper industry in the production of sulphate pulp and improves the quality of the target product by stabilizing the quicklime consumption. New in the method of managing the regeneration of liquors in the production of sulphate pulp is the additional measurement of the current values of quicklime consumption and the degree of caustisation of white cooking liquor, the determination of the current values of quicklime consumption by the current values of green liquor density, the density of white cooking liquor and the implementation of the correction of the supply of quicklime depending on the value of the ratio of the sum of all current values of the cost of quicklime and lead to a magnitude proportional to the amount of deviation values each found current consumption of quicklime by a predetermined flow - flow due to increased stabilization degree causticizing the white liquor is reduced consumption of quicklime, dynamic error is reduced by the degree of causticization of white liquor and cooking for consumption of quicklime. 1 il.

Description

The invention relates to pulp and paper production and can be used in automated systems for managing the regeneration of liquors in the production of sulphate pulp.

The purpose of the invention is to improve the quality of the target product by stabilizing the consumption of burnt lime.

The drawing shows a block diagram of a system for implementing a method for controlling the regeneration of liquors.

The installation consists of a quencher-classifier 1 and causticator 2. The control system contains a sensor 3 for green liquor density, a sensor 4 for the density of the mixture, a sensor 5 for caustisation of white cooking liquor, a sensor 6 for current lime consumption, a functional lime 7 for calculating the quick lime in depending on the current value of the density of green liquor, a function block 8 for calculating the quicklime consumption depending on the current

Ca

values of the reaction mixture, quick lime consumption function block 9 depending on the current caustisation level of the white cooking unit, multiplier-dividing unit 10, device 11 comparing the current value of quick lime with the operator's task, quick lime consumption controller 12, actuator 13 quicklime consumption.

The method is carried out as follows.

The signals from sensors 3-5 are fed to the inputs of function blocks 7-9, where the calculation is performed according to the following dependencies:

Gu p Gu p - 1 + ki, p +

+ k2 / P3in n-1,

 n-1 H-f1 / n +, n p - 1 -f C1 X

X p - C2 Kbsch p - 1 / Common PCCsc

where GU, GU, GU are, respectively, the current values of quick lime consumption depending on the current values of the density of green liquor, the density of the reaction mixture and the degree of caustisation of white cooking liquor;

ki, k2, li, l2, ci, C2 are the tuning factors of the control system blocks;

RCS, / ES, k6m are, respectively, the current values of the density of green liquor, the density of the reaction mixture, and the degree of caustisation of the white cooking liquor.

Calculated current values

, simultaneously with the current value of quicklime consumption (signal from sensor 6) is fed to the input of multiplying-separating block 10, in which the ratio of the sum of all current values of quicklime to the proportion proportional to the sum of deviations of each found current value of quicklime is calculated lime from a given, i.e. in block 10, the following functional dependence is realized (obtained in the process of experimental studies);

G.:iiiii dist5.

t

4.G .. fm + GuU

(P

where the value is proportional to the sum of deviations of each current value of the quicklime consumption from the target, determined by the following dependence;

four

I,

Z.

, 03 g -1 A:

/ 9зщ

  .Gu

, 03- - - bsch

 1zz,

Gu p oto0 ,,

where K, T are the settings of the multiplier but-divided unit of block 10.

The obtained value of schien by its physical essence is the current average consumption value of burnt lime.

Comparing in block 11 this value with

03

the task (Gu) of the operator, get the error signal DSi p, which corrects the supply of burnt lime to the classifier 1, using the regulator 12, acting on the actuator 13,

The application of the invention allows to stabilize the consumption of quicklime, to improve the quality of white cooking liquor due to the fact that the process control method takes into account a generalized parameter, including a combination of four technological parameters regulating the regeneration of liquor in the production of sulphate pulp.

Claims (1)

Claim Method A method for controlling the regeneration of liquors in the production of sulphate pulp, which consists in measuring the degree of caustisation of white cooking liquor and in the supply of quicklime to green liquor depending on the current values of green liquor density and the reaction mixture, which is different in order to improve the quality the product, the current values of the quicklime consumption and the degree of caustisation of the white cooking liquor are additionally measured, the current values of the costs of quicklime are determined lime on the current values of green liquor density, the reaction mixture and the degree of causticization of white cooking liquor and adjust the supply of quicklime depending on the ratio of the sum of 55 all current values of quicklime to the value proportional to the sum of deviations of each found current value of unsized lime from specified flow rate. 25 thirty 35 40 45 50