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超临界对冲燃烧锅炉低负荷运行及环保性能的模拟研究

Simulation research on low load operation and environment performance of supercritical opposite combustion boiler
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摘要 为获得某电厂超临界对冲燃烧锅炉低负荷工况下的运行及环保性能,基于锅炉设计参数与现场试验数据,采用ANSYS Fluent软件对低负荷运行状态进行数值模拟研究,根据现场实际试验的情况控制燃烧器的投运方式、风速和风量等边界条件,模拟结果直观反映炉膛内的燃烧状态,并进一步对比25%和30%负荷工况的计算情况。结果表明,在25%负荷工况下,温度场及速度场表现均匀对称,整体稳燃性能优于30%负荷工况;30%负荷工况供风量大,O_(2)充足,CO浓度低于25%工况,但由于30%负荷工况多投运后墙中层燃烧器,对冲性能差,不仅容易造成前墙水冷壁超温,还会产生更多的NO_(x)堆积于前墙,出口的NO_(x)排放浓度为531.69 mg/m^(3),约为25%负荷工况的1.35倍。 Based on the design parameters and field test data of a supercritical opposed combustion boiler in a power plant,this paper uses ANSYS Fluent software to conduct numerical simulation research on the low-load operating state.According to the actual situation of the field test,the boundary conditions such as the operation mode of the burner,wind speed and air volume are controlled,and the simulation results directly reflect the combustion state in the furnace.After verifying the accuracy of the model,the calculation results of the 25%and 30%load conditions are further compared.The results show that the temperature field and velocity field are uniform and symmetrical under the 25%load condition,and the overall stable combustion performance is better than that of the 30%load condition.condition.In the 30%load condition,due to the more middle-level burners in the rear wall,the hedging performance is poor,which not only easily causes the overheating of the front wall water wall,but also produces more NO_(x)accumulation in the front wall,and the outlet NO_(x)emission in the 30%load condition The amount is about 1.35 times of the 25%load condition.
作者 屠博 李德波 廖伟辉 吕兴城 金凤雏 闫超 尹秋钰 陈兆立 阙正斌 阚伟民 余冯坚 TU Bo;LI Debo;LIAO Weihui;LYU Xingcheng;JIN Fengchu;YAN Chao;YIN Qiuyu;CHEN Zhaoli;QUE Zhengbin;KAN Weimin;YU Fengjian(Guangdong Honghaiwan Power Generation Co.,Ltd.,Shanwei 516600,Guangdong China;China Southern Power Grid Technology Co.,Ltd.,Guangzhou 510080,Guangdong China;College of Power Engineering,North China Electric Power University,Baoding 071003,Hebei China;Zhaoqing Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Zhaoqing 526060,Guangdong China;China Southern Power Grid Co.,Ltd.,Guangzhou 510663,Guangdong China;Guangdong Energy Conservation&Supervision Center,Guangzhou 510030,Guangdong China)
出处 《电力科技与环保》 2024年第4期407-415,共9页 Electric Power Technology and Environmental Protection
基金 国家自然科学基金项目(51376171) 中国南方电网有限责任公司科技项目(NYJS2020KJ005)。
关键词 超临界锅炉 数值模拟 低负荷运行 深度调峰 NO_(x)排放 supercritical boiler numerical simulation low load operation deep peak regulation NO_(x)emission
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