Treatment device for emission reduction control over nitrogen oxide in flue gas

Abstract

The invention provides a treatment device for emission reduction control over nitrogen oxide in flue gas, which has the advantages of effectively utilizing an agent, reducing the emission of the nitrogen oxide in the flue gas, simultaneously preventing over-leakage of ammonia gas, prolonging the service life of a spray gun to the greatest extent and reducing the operation and maintenance cost. The treatment device comprises an agent storage tank, a diluting water tank, an agent conveying unit, a diluting water conveying unit, a pipeline mixer, an agent spray unit and a flue wall, and is characterized in that: the agent conveying unit comprises an agent storage tank outlet switch valve, an agent spray pump and an electromagnetic flow meter; an outlet of the agent storage tank is connected with the agent storage tank outlet switch valve, the agent spray pump and the electromagnetic flow meter through a pipeline in sequence and then communicated with an inlet of the pipeline mixer; the agent spray pump is connected with a frequency converter; the frequency converter is connected with a PLC (Programmable Logic Controller) module; and an effluent concentration signal of the nitrogen oxide in a chimney is connected to an input end of the PLC module.

Description

technical field [0001] The invention relates to the technical field of flue gas pollution prevention and control engineering, in particular to a treatment device for flue gas nitrogen oxide emission reduction control. Background technique [0002] The flue gas produced during the operation of coal-fired power plants or domestic waste incineration power plant boilers contains a large amount of nitrogen oxides (including NO, NO 2 , N 2 O, etc., collectively referred to as NOx), this pollutant is considered to be one of the main sources of air pollution and acid rain. Therefore, the control and treatment of nitrogen oxide pollution has always been a research hotspot in the field of international environmental protection. Selective Catalytic reduction reaction (SCR) and selective non-catalytic reduction (SNCR). [0003] The principle of selective catalytic reduction (SCR) is that under the action of a catalyst, the amino group in the reducing agent reduces nitrogen oxides ...

AI Technical Summary

Problems solved by technology

[0005] When the existing Selective Non-Catalytic Reduction (SNCR) denitrification project is actually used, the adaptability to changes in working conditions is not strong, the use efficiency of the chemical is not high, and the excessive decomposition of the chemical is caused by the escape of ammonia gas, which damages the follow-up equipment of the flue. And its injection device is fixedly installed at the injection position of the furnace flue. Whether the system is running normally or fails, the nozzle of the spray gun is always exposed to the flue gas environment with high temperature and high dust concentration. The nozzle is often damaged by burns or scaled. Blockage, short service life of the nozzle, inconvenient maintenance and replacement

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