Influence of atomizer structure parameters on SNCR denitration performance of CFB boiler

化学工业与工程

Chemcial Industry and Engineering

2022, Vol. 39

Issue (1) :116-126 DOI: 10.13353/j.issn.1004.9533.20210101

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Influence of atomizer structure parameters on SNCR denitration performance of CFB boiler

XU Shunsheng^1,2, PEI Fei¹

1. College of Mechanical Engineering, Xiangtan University, Hunan Xiangtan 411105, China;
2. College of Energy Science and Engineering, Central South University, Changsha 410083, China

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Abstract Reductant atomization quality has an important influence on SNCR denitrification efficiency of CFB (circulating fluidized bed) boiler of cyclone separator. In order to study the influence of air atomizing nozzle structure parameters on atomization quality and denitrification efficiency, the numerical simulation of the nozzle structural parameters of four single factor analysis was adopted, with the orthogonal numerical test of nozzle structure parameters carrying out. The four structural parameters of the nozzle are the length of the impactor, the diameter of the outlet, the length of the mixing chamber and the angle of the gas-liquid inlet. The results show that the main factor affecting the denitrification efficiency of cyclone separator is the diameter of nozzle outlet and the secondary factor is the length of impactor. The denitrification efficiency reaches the maximum when the impactor length is 6 mm, the outlet diameter is 2.5 mm, the mixing chamber length is 14 mm, and the gas-liquid angle is 60°. The denitrification efficiency of cyclone separator under the most optimal combination of nozzle structure is 77.5%, and the ammonia escape rate at the outlet is 5.78 mg·Nm^-3.

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	XU Shunsheng
	PEI Fei

Keywords： air atomizing nozzle； selective non-catalytic reduction； numerical simulation； orthogonal test

Received 2021-01-04;

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XU Shunsheng, PEI Fei.Influence of atomizer structure parameters on SNCR denitration performance of CFB boiler[J] Chemcial Industry and Engineering, 2022,V39(1): 116-126

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