System and method for preventing abs solidification and clogging ah by hot primary air countercurrent circulation

Abstract

The invention relates to a system and a method for inhibiting AH blockage due to ABS solidification through hot primary air countercurrent circulation. The problem of corrosion and blockage of a heated surface of an air preheater has not been solved so far. The system comprises a tri-sectional rotary air preheater and is characterized by further comprising a hot primary air extracting pipeline, a hot air introduction hot secondary air bellow pipeline and a hot air introduction cold end pipeline; the tri-sectional rotary air preheater is provided with a cold end first sector plate and a hot end first sector plate; an independent countercurrent heating bin is formed between the cold end first sector plate and the hot end first sector plate and is positioned between a secondary air branch bin and a flue gas branch bin; a cold end pressure stabilizing chamber is arranged on the cold end first sector plate; a hot end pressure balancing chamber is arranged on the hot end first sector plate; and one end of the hot air introduction hot secondary air bellow pipeline is connected with the hot end pressure balancing chamber. According to the system and the method disclosed by the invention, the problem that the air preheater is seriously blocked due to the fact that ABS is adhered to a heat exchange surface in the operation process of a coal-fired plant boiler can be thoroughly solved.

Description

technical field [0001] The invention relates to a system and method for suppressing ABS solidification and clogging AH by hot primary air countercurrent circulation, and belongs to the technical field of clogging prevention and control of air preheaters of coal-fired power stations. Background technique [0002] Coal-fired power plants will generate SO when burning coal with a certain amount of sulfur 3 , the resulting SO 3 The amount is affected by factors such as the level of sulfur in the coal, ranging from a few ppm to dozens of ppm or even higher. Controlled by environmental protection standards, coal-fired power plants are basically equipped with SCR systems to treat NOx produced by combustion. x Removal to meet environmental standards for NO x emission concentration requirements. SCR system removes NO x The process needs to generate NO according to the boiler x Inject a large amount of NH 3 , limited by site conditions, some NH 3 Failure to fully participate i...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to completely solve the problem of ABS sticking to the heat exchange surface and blocking the air preheater during the operation of the boiler in the coal-fired power plant, and provides a system and method for preventing the ABS from solidifying and blocking the AH through the countercurrent circulation of hot primary air

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