Ammonia gas SNCR denitration system for tower-type boiler

Abstract

The invention provides an ammonia SNCR denitration system for a tower type boiler, belongs to the field of environment-friendly denitration, and aims to solve the problems of tube explosion of a superheater, ammonia escape and influence on the boiler efficiency caused by shortening of effective reaction time in conventional reduction reaction. An air inlet of an ammonia conveying pipeline is connected with an ammonia pipeline, and an air outlet is connected with an air inlet of an ammonia-air mixer; an air inlet of a dilution fan is connected with an air pipeline, and an air outlet is connected with an air inlet of an air conveying pipeline; an air outlet of the air conveying pipeline is connected with an air inlet of the ammonia-air mixer, an ammonia spraying grid device is arranged between a third-level superheater and a fourth-level superheater of a tower-type boiler, an air outlet of the ammonia-air mixer is connected with an air inlet of a first valve, and an air outlet of the first valve is connected with an air inlet of the ammonia spraying grid device; a second valve, an electric control valve, a third valve, an ammonia gas flowmeter and an ammonia gas leakage detector arearranged on one branch of the ammonia gas conveying pipeline, and a fourth valve is arranged on the other branch of the ammonia gas conveying pipeline; and a flexible coupling, a check valve, a butterfly valve and an air flow meter are arranged on the air conveying pipeline.

Description

technical field [0001] The invention relates to the technical field of environmental protection denitrification, in particular to an ammonia SNCR denitrification system for tower boilers. Background technique [0002] Coal is one of the main energy sources in the world today. With the rapid development of the global economy, the development and utilization of coal has brought serious pollution to the environment, especially the large amount of sulfur oxides and nitrogen oxides emitted by coal-fired power plant boilers. exacerbated environmental degradation. On the one hand, nitrogen oxides can form photochemical smog together with hydrocarbons under certain conditions, damaging the atmospheric environment, seriously endangering human health, and deteriorating the environment on which human beings depend; on the other hand, sulfur oxides and nitrogen oxides are main cause of acid rain. Therefore, reducing nitrogen oxide emissions and developing effective flue gas denitrific...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems that the current SNCR denitrification system uses a liquid reducing agent to perform the reduction reaction, the effective reaction time will be shortened, the superheater will burst, the ammonia will escape, and the boiler efficiency will be affected. Ammonia SNCR denitrification system for boilers

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