SU798215A1 - Pulp production automatic control method - Google Patents

Description

The invention relates to the pulp and paper industry and can be used to control the process of producing sulphate pulp in batch bins.

A known method for automatically controlling the process of producing cellulose by controlling the supply of the active cooking reagent depending on the amount and humidity of the wood loaded into the boiler, regulating the stiffness and yield of cellulose depending on the values of the kinetic integral invariant and

The disadvantage of this method is that it does not provide for stabilization of the cooking cycle of the digester depending on the species composition of the wood loaded in the boiler, which reduces the quality of pulp and boiler performance.

The purpose of the invention is to improve the quality of pulp and productivity of the digester.

This goal is achieved by determining the percentage of solid wood loaded in the boiler, and the supply of active 30 cooking reagent is additionally controlled depending on the content of solid wood of wood.

C, ₃ arp (^ O.O1W) -V _k p _M / 0

G _TS = ---- ' ^U) where ^G T6 ^G 3qrp w Р

RT

Rm

1.1 the amount of solid wood loaded in the boiler, the mass of wood loaded in the boiler, kg; wood moisture content,%; loading density, m ³ / m ³ ; volumetric mass of hardwood, kg / m5; volumetric mass of soft wood, kg / m ³ ; dimension coefficient.

The drawing shows an automatic control system that implements the proposed method.

The system includes a single digester 1, a computing device 2, adjusters 3-6, respectively, of the boiler volume, loading density β, volumetric mass of hard rock p- ^ volumetric mass of soft rock recalculation device 7, computing device 8 for determining the flow rate of the active reagent, adjusters 9 and 10, respectively, the concentration of the active reagent and the percentage of reagent to the mass of absolutely dry wood loaded in the boiler, the metering device 11, the regulating body 12 for supplying the reagent to the boiler.

The system operates as follows.

At the output of a single digester, the mass of wood loaded into the boiler is measured.

W, which enter the computing device 2, where the boiler volume ν _κ , loading density [b, volumetric mass of hardwood rr and volumetric mass of softwood rm are respectively introduced from the adjusters 3-6, respectively. The computing device using this data by the formula (1) determines the percentage of hardwood loaded in the boiler.

Received from the output of computing device 2, the signal about the percentage load of the digester with solid wood is fed through the recalculation device 7 to computing device 8, which receives signals from meters of wood loaded into the boiler G _jar .p and its moisture content W, as well as from controllers 9 and 10 the concentration of the active alkali of white liquor C _AkT entering the cooking, and the percentage of liquor to the mass of absolutely dry wood P loaded into the boiler.

Computing device 8 calculates the amount of liquor that must be poured into the boiler, depending on the mass of absolutely dry wood loaded in the boiler, the concentration of active alkali in the poured liquor and the amount of hardwood loaded in the boiler, and gives the calculated value as a reference to the dosing , device 11. The aerating device doses the preset value of white liquor by comparing the current total value of W (fi ^ with the set value and the effect on the regulator 12 _? installed on the line under Achi of white liquor in the digester.

Claims (1)

Claim A method for automatically controlling the process of producing cellulose by controlling the supply of an active cooking reagent, depending on 20 of the quantity and humidity of wood loaded into the boiler, regulation of the stiffness and yield of cellulose depending on the values of the kinetic integral invariant, according to which, in order to improve the quality of cellulose and the productivity of the digester, the percentage of solid wood loaded in the boiler, and the supply of the active cooking reagent is additionally regulated depending on the content of hardwood. __ Sources of information, ”accepted. Attention to the examination 1, USSR Copyright Certificate No. 362101, cl. D 21 C 3/26, 1973.