雾化器结构参数对循环流化床锅炉SNCR脱硝性能影响研究

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摘要还原剂雾化质量对循环流化床锅炉旋风分离器SNCR脱硝效率具有重要影响，为研究空气雾化喷嘴结构参数对雾化质量及脱硝效率的影响，采用数值模拟的方法对喷嘴的4个结构参数即撞击件长度、出口直径、混合室长度和气液入口交角，进行单因素分析和正交数值试验，结果表明影响旋风分离器烟气脱硝效率的主要因素是喷嘴出口直径，次要因素是撞击件长度，当撞击件长度为6 mm、出口直径2.5 mm、混合室长度14 mm和气液入口交角60°时脱硝效率达到最大，此时旋风分离器脱硝效率为77.5%，出口处氨逃逸率为5.78 mg·Nm^-3。

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	徐顺生
	裴斐

关键词：空气雾化喷嘴；选择性非催化还原；数值模拟；正交试验

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.

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

Received 2021-01-04;

Fund:国家自然科学基金资助项目（51976054）；国家自然科学基金资助项目（11932016）；湘潭市科技计划项目（CG-YB20201006）；湘潭市科技计划项目（CG-YB20201006）

Corresponding Authors: 徐顺生,副教授,E-mail:787749816@qq.com Email: 787749816@qq.com

About author: 徐顺生(1963-)，男，博士，副教授，现从事热工仿真方面的研究

引用本文:

徐顺生, 裴斐.雾化器结构参数对循环流化床锅炉SNCR脱硝性能影响研究[J]. 化学工业与工程, 2022,39(1): 116-126

XU Shunsheng, PEI Fei.Influence of atomizer structure parameters on SNCR denitration performance of CFB boiler[J]. Chemcial Industry and Engineering, 2022,39(1): 116-126

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