Automatic control device for soot blower in SCR denitration process, and control method of control device

Abstract

The invention discloses an automatic control device for a soot blower in an SCR denitration process and a control method of the control device. The control method comprises the following steps: controlling the ultrasonic wave soot blower to blow soot for 5 minutes by a PLC processor; presetting a value of soot content inside a reactor in the PLC processor; according to a time interval with the cycle of 1 second, respectively detecting the particle concentration and the gas flow of inlet gas through an inlet particle concentration sensor and an inlet gas flow sensor; according to the time interval with the cycle of 1 second, respectively detecting the particle concentration and the gas flow of outlet gas through an outlet particle concentration sensor and an outlet gas flow sensor; calculating the soot content inside the reactor by a formula, judging whether the internal soot content is larger than the set value or not, opening the ultrasonic wave soot blower and delaying for 1-3 minutes when the internal soot content is larger than the set value, and continuing to measure when the internal soot capacity is smaller than the set value. The device and the method have the benefits that the soot content in a reactor can be effectively controlled, and soot can be automatically and precisely blown.

Description

technical field [0001] The invention belongs to the technical field of air pollution prevention and control, and relates to an automatic control device and a control method for a soot blower in an SCR denitrification process. Background technique [0002] Coal-fired devices, such as thermal power plants, emit flue gas that will cause air pollution, one of the main pollutants is NO X , the main treatment means in the prior art are: Selective Non-catalytic Reduction (SNCR), and Selective Catalytic Reduction (SCR). [0003] Soot blowing control is one of the key technologies in SCR denitrification technology. The traditional SCR denitrification soot blower is controlled by a fixed time control method, such as: blowing soot 1-3 times a day at a fixed time. After a period of time, the pressure difference will increase exponentially, and the amount of dust inside the reactor cannot be effectively controlled, resulting in very serious catalyst blockage. The blockage of the catal...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic control device for the soot blower in the SCR denitrification process, which solves the problem that the current traditional SCR denitrification soot blower control adopts a fixed time control method and cannot control the amount of soot blowing to cause catalyst blockage

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