SU869814A1 - Method of automatic distribution of gaseous flows in the parallely operating electric filters of equipment - Google Patents

Description

The invention relates to the automatic control of complexes of parallel-running electrostatic precipitators, dedusting the waste industrial gases of non-ferrous metallurgy, and can be used in industries that use complexes of parallel-running electrostatic precipitators combined at the inlet and outlet of collectors of dirty and clean gases. The known method of gas cleaning by electrostatic precipitators, in which the degree of gas purification of each electrostatic precipitator is determined by measuring the concentration of dust in gases 1 at its inlet and outlet, however, it is impossible to use these physical quantities for the automatic distribution of gas flows through the parallel operating electrostatic filters of the complex sensors automatically detect dust concentration, i.e. dust content of metallurgical gases of copper-smelting production both at the inlet and at the outlet of dust collecting devices, including electric precipitators. The closest technical solution to the proposed is the automatic distribution of gas flows over the parallel electrostatic precipitators of the complex by measuring the temperature, flow rate and chemical composition of the source gas 2. The disadvantage of this method is that it does not take into account the distribution of gas flows. The strong values of power consumed by each of the electrostatic precipitators, this leads to significant emissions along with the gas of harmful components. The aim of the invention is to reduce harmful emissions by improving the quality of regulation. This goal is achieved by additionally determining the relative values of the power consumption of an electrostatic precipitator by dividing the predicted power of the electrostatic filter by the total value of the predicted power consumed by all electrofilters of the complex, and distributing the gas flow to the electrostatic filters depending on the relative values of the predicted power of each electrostatic filter.

The drawing shows a control system implementing the proposed method.

The method is carried out as follows. A dusty gas stream of 1 ton of metallurgical aggregates, such as furnaces and converters, measured by flow sensors 2 and 3 and chemical composition, for example the concentration of sulfur dioxide, flows through the boron gas duct 4 to the 5 dirty gas collector and is distributed along the complex of parallel electric filters bis the subsequent combining of the flows in the collector 7 of clean gas, from where the gas is distributed along the lines of the sulfuric acid production 8.

The gas streams 9 passing through the electrostatic precipitators 6 are also monitored by sensors 10 and 11 of temperature and flow.

The main indicator of the gas purification process in an electrostatic precipitator, the filter power, is determined from the characteristics of the electric modes of the voltage fields 12 and the current 13 taken from the power supply unit 14 of the electrodes 15 fields.

The values of the parameters of gas flows and electrical modes through the block 16 of the transducers are fed to the computing device 17.

In the computing device 17 is carried out:

- determination of the value of power consumed by each field 15 of the electrostatic precipitator 6, at a voltage of 12 and current 13;

 - determination of the power consumed by each electrostatic precipitator 6 by summing up the powers consumed by the fields of the 15 electrostatic precipitator;

- prediction of the power consumed by the electrostatic precipitator 6, depending on the current, two previous values of power and the input parameters of gas flows measured by sensors 3, 10 and 11;

- determination of the total predicted power consumed by all the electrostatic precipitators of the complex;

- determination of the relative values of the predicted powers consumed by the electrostatic precipitators by dividing the values of the predicted powers of the electrostatic precipitators by the value of the total predicted power consumed by all the electro-filters of the complex;

- determination of tasks for gas consumption per separate electrostatic precipitator of the complex by multiplying the relative value of the predicted power of each electrostatic filter by the total gas consumption measured by sensor 2;

- formation of a control signal for the issuance of settings to a block of 18 regulators based on the obtained values of the tasks of gas flow rates through each filter.

The regulator unit 18, using the measured values of current expenses (sensor 11) through the electrostatic precipitators 6, stabilizes the given expenses for each electrostatic precipitator. When the input flow rate (gas flow (sensor 2), input gas flow parameters (sensors 3, 10, 11) in separate electrostatic precipitators b and power consumed by each smoke electrostatic precipitator b is changed, the computational operations are repeated and the gas flow rates are calculated on individual electrostatic precipitators b of the complex, and control signals are generated for outputting the installation to the control unit 18

The proposed method of controlling the gas purification process in electrostatic precipitators allows increasing the efficiency and degree of purification of each filter and the complex as a whole by using information about the predicted power consumed by the fields of the electrostatic precipitator, depending on the current and previous values of power and parameters of the input gas flows. gas consumption and chemical composition, for example the concentration of sulfur dioxide, by:

- ensuring the operation of the electrostatic precipitators of the complex at optimal gas loads;

- increase and stabilize the degree of gas purification by individual electrostatic precipitators and the complex as a whole;

- increase of efficiency, reliability and service life of the technological equipment of the complex.

Claims (2)

1.Aliev G.M.A., and Gonik A.E. Electrical equipment and power supply modes for electrofilters. M., Energie, 1971, p. 25-27. 2. USSR author's certificate I 498018, cl. On 01 D 46/46, 1974.