不同燃尽风风量对炉内燃烧影响的数值模拟  

Numerical Simulation on Effects of OFA Rate on In-furnace Combustion of Boilers

作　　者：宋景慧[1] 李兵臣 李德波[1] 周少祥[3] 

机构地区：[1]广东电网公司电力科学研究院,广州510600 [2]东莞中电新能源热电有限公司,东莞523127 [3]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《动力工程学报》2014年第3期176-181,共6页Journal of Chinese Society of Power Engineering

摘　　要：对某电厂对冲燃烧锅炉的炉内燃烧进行了数值模拟，在锅炉实际运行工况的基础上，通过改变燃尽风风量占二次风总风量的比例，得到其对炉内温度场和NO，排放质量浓度场的影响．结果表明：从锅炉安全运行考虑，燃尽风风量占二次风总风量的比例不应超过0．30；从NOx排放质量浓度考虑，燃尽风风量占二次风总风量的比例应该控制在0．23以上；综合考虑锅炉的安全性和NOx排放质量浓度，燃尽风风量占二次风总风量的比例应该控制在0．23～0．30．Numerical simulation was carried out to the in-furnace combustion of an opposite firing boiler, so as to analyze the effect of overfire air （OFA） rate on both the in-furnace temperature field and the NO, concentration, on the basis of actual boiler working conditions. Results show that from the point of view of boiler safety, the proportion of OFA rate to total secondary air volume should not be more than 0.30, which, from the point of view of NOx concentration, should be kept above 0.23. Comprehensively consid ering both the boiler safety and NOx concentration, the proportion of OFA rate to total secondary air vol- ume should be controlled within 0. 23-0. 30.

关 键 词：对冲燃烧锅炉 二次风配风 NOX排放 燃尽风风量 数值模拟 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]