SU1079297A1 - Method of controlling the process of cleaning gases in electric wave filter - Google Patents

Abstract

A method for controlling the purification of gases in an electric filter by measuring the temperature, pressure and gas composition at the inlet to the electrostatic precipitator, characterized in that, in order to reduce the secondary entrainment of the slips, the dispersion composition and density of the slurry determine the vitality at the inlet of the electrostatic precipitator The dust particles of the predominant fraction, while the gas flow rate through the electrostatic precipitator during the shaking of the electrodes is changed depending on the speed of the dust particles.

Description

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vj The invention relates to methods for controlling the purification process of metallurgical gases in an electrostatic precipitator and can be used in the metallurgical, chemical, coal and other industries. There is a known method of controlling the process of gas cleaning in an electrostatic precipitator by adjusting the beginning of the period of shaking the electrodes depending on the weight of the C1J dust deposited on them. The disadvantage of the method is that the gas flow rate during shaking remains constant, as a result, with insufficient thickness, the dispersion and the dust at the gas flow rate exceeding the soaring speed of the particles of the predominant fraction, along with the gas flow, is removed . there is a so-called secondary pulverizer. The closest to the invention to the technical essence and the achieved result is the method of controlling the process of gas purification in an electrostatic precipitator by measuring the temperature, pressure and composition of the gas entering the electrostatic precipitator 2. The disadvantage of the known method is that it does not provide a reduction in speed gas flow at the time of shaking the electrodes: the electrostatic precipitator from the settled dust, which in turn leads to a secondary run. The purpose of the invention is to reduce secondary dust loss. The goal is achieved by the method of controlling the gas purification process in the electrolum by measuring the temperature, pressure and gas composition at the inlet to the electrofilter, the dispersed composition and the density of dust are measured at the inlet of the electrostatic precipitator. dust of the predominant fraction, while the gas flow rate through the electro- filter during the shaking of the electrodes is changed depending on the rate of growth of dust particles. The drawing shows a schematic diagram of a system implementing this method. Copper-smelting gases are fed to dust removal from the electrostatic precipitator 1. Sensors 2, 3 and 4 measure the composition, temperature and 1 7 gas, the pressure measurement results go to the first computing unit 5, where the current density of the p and viscosity is calculated /and. f- gas flow in Lormulas ft + D 1 o -, -, 273 + c / Tg p o -o () 273: Y 5 (g Co gUO 101325 T g l273 / gas density under normal conditions, B - barometric pressure , Pf - pressure (discharge) in a gas pipeline, Tj. - gas temperature, ° K; / tip - gas viscosity at 0 ° C; C - constant. Measured manually or automatically by sensors 6 and 7, density p and dispersion composition d of dust and the value of the density and viscosity of the gas calculated in the first computational unit 5 are transferred to the second computational unit 8. The diameter of the dust particles of the predominant fraction is calculated by the formula, - 2J} 1 y (d4 / d) relative particle content,%; standard deviation; t (d / o / vv) the logarithm of the ratio of the current size d to the median d f. In the second computing unit 8, the vian particle velocity v of the prevailing Values according to the formula 2 (f4-fr) V L, the calculated value of the vian speed is fed to the first input of the switch unit 9. Before turning on the electrical control device 10 of the executive mechanism 1I of the electrostatic electrode shaking device 1, the corresponding signal is fed to the second input of the switch chenn 9. While the latter cuts off the output specifying bloa 12 operating in peiod shaking between the electrodes E, that the comparator input 13 and the output of the second podlyuchaet vychislitelnoo block 8 to block entry cpaBHeHHf

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13. Comparison unit 13 of the governing body 17. The executive comparison of the current value of expenditure 16 manages the manager

the gas flow of the incoming ossignal of the control unit 15 and the flow sensor 14 with the gas flow, the flow rate rasa at the inlet of the electric

specified for the period of shaking the filter I for a predetermined amount of regutrodes coming from the output of the second body 17. of the computing unit 8, and re-regulating the gas flow, resulting from the mismatch from the unit matching through the electrostatic filter

13 is transmitted to a control-period shaking unit up to a speed not

vani 15, which produces a control- | Q exceeding the soar speed of particles

The main signal, for example, on the reduced-dust predominant fraction, is the gas flow rate. It controls the secondary dust removal with an arresting signal to reduce the electrode consumption by 75%, which gives

From the regulation block 15 comes the economic effect. 30 thousand rubles. at

the actuator 16 regul.

Claims (1)

METHOD FOR CONTROL OF GAS CLEANING PROCESS IN ELECTRIC FILTER by measuring the temperature, pressure and gas composition at the inlet of the electrostatic precipitator, characterized in that, in order to reduce secondary dust entrainment, the dispersed composition and dust density are additionally measured at the inlet of the electrostatic precipitator and the density of dust particles is determined from the measured parameters the predominant fraction, while the gas flow through the electrostatic precipitator during the shaking of the electrodes is changed depending on the speed of the dust particles. > SU 1079297.