SU1052596A1 - Method of automatic control of ash-blowing process in soda regeneration units - Google Patents

Description

The invention relates to the pulp and paper industry and can be used to control the process of soot-stripping of a recovery unit.

Lime is a method of automatic control of the sootblowing process in soda recovery units by adjusting the steam supply to the blower, heating surfaces in the flue depending on the current values of pressure differences, temperatures and dust concentrations, combustion products at the inlet and outlet of the heating surfaces of the recovery unit via the gas path Cl. The disadvantage of this method is the low control efficiency.

The purpose of the invention is to increase management efficiency.

This goal is achieved by the fact that according to the method of automatic control of the process of sootblowing in soda recovery. units by adjusting the steam supply to blow the heating surfaces in the duct depending on the current pressure differential values, temperatures and dust concentrations of the combustion products at the inlet and outlet of the heating surfaces, the recovery unit, measure the mass flow rate of the water, density, and volume flow black liquor burned in the recovery unit, the current value of the coefficient of excess air, and the flow of steam is adjusted depending on the number of values.

The drawing shows a schematic diagram of a device that implements the proposed method.

The optimal regulator of the sootblowing process contains sensors 1 and 2 of the pressure of combustion products at the inlet and outlet of heating surfaces, sensors 3 and 4 of the temperature of combustion products at the entrance and exit of heating surfaces, sensors 5 and 6 of dust concentration in the combustion products at the entrance and exit of heating surfaces, sensor 7 of the coefficient of excess air, block 8 for calculating f controller 9, actuator 10 for supplying steam for blowing, sensor 11 for mass flow rate of melt, sensor 12 for volume flow of black liquor, sensor 13 for density of black liquor.

H, S.v

g-1

tpt-tpt

H - stats coefficients

yo

Chesky setting contour steam adjustments; 65

The control object is the heating surface of the 14th board. generation unit, gas duct 15 and manifolds 16 for entry and exit of the heated agent in heating surfaces 5.

The device works in a slow way.

The value of signals received from sensors 1-6, 11-13, in block 8 0 of calculation, determines the current value of the thermal performance coefficient by the following relation

 (,,

 15 r

-tw

 Rchshn.N

where C is the specific heat,

kJ / kg-degree / Vf. - temperature, hail, 0 Prg concentration, kg / nm;

QP - flue gas service

the output of the soda recovery unit, determined by the pressure differential, 5 PL specific enthalpy of the melt,

kJ / kg;

 - mass flow rate of water, kg / h; Q is the volume flow rate of the black location supplied to the combustion in the furnace of the recovery unit, Pvui, the density of black liquor,

R

Q is the lower calorific value of black liquor, 5; kJ / kg

The output signal from block 8 is fed to the input of the regulator 9, to the other input of which the signal from the sensor 7 of the coefficient of excess air0 ha is received.

To directly measure the air excess factor scale, the percentage of free oxygen Q in the sensor 7 peredugrairo5 Van to the current value of the airflow excess according to the formula

n / .il

 T-lir

(2J,

where Qg is the percentage of free oxygen in the flue gases of the soda recovery ag. regatta.

The regulator 9, depending on the improvement of the signals, access from block 8 and the sensor, 7, through the operating mechanism 10, makes an adjustment of the supply of the pair by the following expression

v () with (, 2

(3)

- ()

prm dr.

only

T, tpt own current and maximum value of the thermal coefficient ct, оС 3 1052596 useful action. Thus, the invention suggests an increase in the efficiency of the control optimal task 5 by the process of the soot1} duvka in the coefficient-coefficient of the excess-generation units.

Claims (1)

METHOD FOR AUTOMATIC CONTROL OF THE SUNFLOWER PROCESS IN SODOREGENERATION UNITS by regulating the steam supply to blow the heating surfaces in the flue depending on the current values of the pressure drops, temperatures and dust concentrations of the combustion products at the inlet and outlet of the heating surfaces of the soda recovery unit through the gas path and with the fact that, in order to improve management efficiency, from; measure the mass flow rate of the melt, the density and volumetric flow rate of black liquor burned in the soda recovery unit, the current value of the excess air coefficient, and adjust the steam supply depending on the measured values. . g cl N3 cl s © o