Cooling system and method for high-temperature ammonia spraying denitration air cooling spray gun of coal-fired boiler

Abstract

The invention discloses a cooling system and method for a high-temperature ammonia spraying denitration air cooling spray gun of a coal-fired boiler. According to the cooling system and method, cooling air enters a cooling air cavity through a cooling air connector and then is divided into two paths, one path enters a near-wall cooling air chamber through a cooling air opening channel and then is sprayed into the boiler through a near-wall cooling air nozzle in the direction parallel to a spray gun pipeline, the effect of cooling smoke around the spray gun pipeline is achieved, the other path of air flows to the end part of the spray gun along the cooling spray gun pipeline and exchanges heat with the wall surface of the cooling spray gun pipeline in the process to reduce the wall temperature, the cooling air reaches the head of the spray gun and is sprayed towards the direction of the fixed structure through a cooling air nozzle at the end part, so that the effect of cooling the flue gas around the spray gun is also achieved, and a thermocouple induction end monitors the temperature of the spray gun head so as to control the flow of cooling air. The method can effectively reduce the surface temperature of the spray gun in the flame, increase the extending distance of the spray gun in the flame, increase the coverage area of a reducing agent, and solve the problem that the surface temperature of the spray gun rapidly rises to influence the efficiency.

Description

technical field [0001] The invention relates to a coal-fired boiler spray gun, in particular to a cooling system and method for a coal-fired boiler high-temperature ammonia injection and denitrification air-cooled spray gun. Background technique [0002] NO x Is a kind of air pollutants, NO emitted by coal-fired boilers x is NO in the atmosphere x One of the main sources of NO x The emissions put forward higher requirements. Therefore, it is urgent to seek and develop boiler deep denitrification technology. The ammonia injection technology in the fuel-rich area is based on the air classification technology and the ammonia injection denitrification technology in the main combustion area. It is a coal-fired boiler that reduces NO x An effective method of emission is mainly to form a high-temperature, strong reducing atmosphere in the main combustion area through low-nitrogen burners and air classification, and spray an amino reducing agent at an appropriate position in th...

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Problems solved by technology

[0005] Aiming at the problem in the prior art that the surface temperature of the spray gun rises rapidly and affects the efficiency, the present invention provides a cooling system and method for a high-temperature ammonia injection and denitrification air-cooled spray gun of a coal-fired boiler

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