Reentrainment control method for low-low temperature electric dust remover

Abstract

The invention discloses a reentrainment control method for a low-low temperature electric dust remover. The rapping period and the rapping sequence are controlled. As for the rapping period, back corona is not generated, that is, rapping is not conducted when secondary voltage and secondary current of terminal electric fields are not changed obviously, or rapping is conducted once when the dust accumulation thickness of a positive pole plate is 1-2 mm, and the time for rapping the terminal electric fields once is 12-20 hours. As for the rapping sequence, the last two electric fields are not rapped at the same time, all chambers of the terminal electric fields are not rapped at the same time, and the cathodes and anodes of the terminal electric fields are not rapped at the same time. According to the reentrainment control method for the low-low temperature electric dust remover, rotary electrode electric fields are arranged on the downstream of a conventional fixed electric field in the smoke flow direction. Compared with the prior art, the control method has the advantages that by controlling the rapping period and the rapping sequence, shortening rapping time, reducing the rapping frequency and using the staggered rapping mode, reentrainment is reduced, or the rotary electrode electric fields are increased to adsorb smoke dust in smoke and reduce reentrainment; by the adoption of the method, reentrainment can be effectively reduced, and dust removal efficiency is improved.

Description

technical field [0001] The invention relates to a method for controlling secondary dust raising of a low-low temperature electric dust collector. Background technique [0002] Low and low temperature electrostatic precipitator technology is a new technology of electrostatic precipitator, which can not only improve the efficiency of electrostatic precipitator and meet the requirements of low emission, but also save electricity coal consumption and reduce power consumption, reduce the specifications of downstream equipment, and remove most of SO 3 , reduce the desulfurization water rate, etc., in line with the requirements of the national environmental protection policy. [0003] In the low-temperature electrostatic precipitator, due to the decrease of the flue gas temperature, the specific resistance of the dust decreases, which weakens the electrostatic adhesion of the dust collected on the anode plate, resulting in an appropriate increase in the secondary dust phenomenon co...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling the secondary dust emission of low and low temperature electrostatic precipitators, which can effectively solve the problem that the existing low and low temperature electrostatic precipitators have serious secondary dust emission and affect the dust removal efficiency