分离燃尽风对贫煤锅炉CO和H_(2)S生成特性的影响  

Influence of Separated Over Fire Air on CO and H_(2)S Formation Characteristic of a Lean Coal-fired Boiler

作　　者：谢召祥 凌鹏 湛芳 张文鹏 李世强 许凯[2] 苏胜[2] 向军[2] XIE Zhaoxiang;LING Peng;ZHAN Fang;ZHANG Wenpeng;LI Shiqiang;XU Kai;SU Sheng;XIANG Jun(Huadian Qingdao Power Generation Co.,Ltd.,Qingdao 266031,Shandong Province,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;Huadian International Power Co.,Ltd.Shandong Branch,Jinan 250014,China)

机构地区：[1]华电青岛发电有限公司,山东青岛266031 [2]华中科技大学煤燃烧国家重点实验室,武汉430074 [3]华电国际电力股份有限公司山东分公司,济南250014

出　　处：《动力工程学报》2021年第9期729-735,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(U1910214);中国华电集团科技资助项目(CHDKJ17-01-15)。

摘　　要：以低氮燃烧改造后的某330MW四角切圆贫煤锅炉为研究对象,采用数值模拟研究了300MW负荷下分离燃尽风率对炉内燃烧速度场、温度场、CO体积分数场、O_(2)体积分数场、H_(2)S体积分数场及炉膛出口参数的影响,并将模拟结果与试验结果进行对比分析。结果表明:分离燃尽风率对锅炉燃烧特性以及CO、H_(2)S的生成特性具有重要影响;随着分离燃尽风率的增大,炉膛出口CO体积分数升高,出口NOx质量浓度降低;减小分离燃尽风率有利于抑制炉内高温腐蚀和结渣的发生;综合考虑锅炉运行安全性、经济性及NOx生成特性多种因素后,燃尽风率设置为25%较为合适。Numerical simulation was carried out on a 330MW tangential lean coal-fired boiler after its lownitrogen combustion retrofit.The influence of separated over fire air(SOFA)rate on the velocity field,temperature field,CO concentration field,O_(2)concentration field,H_(2)S concentration field and outlet flue gas parameters was studied under 300MW load,and the results were compared with the field test values.Results show that SOFA rate has an important influence on the combustion and CO/H_(2)S formation characteristics.With the increase of SOFA rate,CO concentration at the furnace outlet gradually increases,and NOxconcentration at the furnace outlet decreases.Reducing SOFA rate is beneficial to inhibit the occurrence of high temperature corrosion and slagging in the furnace.Comprehensively considering the boiler operation safety,economy and NOxformation characteristics,25%is a more appropriate value to set SOFA rate.

关 键 词：贫煤锅炉 低氮燃烧 分离燃尽风率 水冷壁 高温腐蚀 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]