350 MW超临界对冲燃烧锅炉煤与生物质混燃数值模拟研究  

Numerical Simulation of Mixed Combustion of Coal and Biomass in 350 MW Supercritical Offset Combustion Boiler

作　　者：武利斌 常岩超 唐宏彬 吴鑫杰 陈文通 孙宝 黄如靖 WU Libin;CHANG Yanchao;TANG Hongbin;WU Xinjie;CHEN Wentong;SUN Bao;HUANG Rujing

机构地区：[1]深能保定发电有限公司,河北保定071000

出　　处：《青海电力》2024年第2期58-64,共7页Qinghai Electric Power

摘　　要：通过采用旋流燃烧器模拟与锅炉炉膛模拟相结合的方式,探究了锅炉100%额定负荷(BRL)下掺烧10%生物质对某350 MW超临界对冲燃煤锅炉燃烧特性的影响,分析了炉内温度场、气氛场随生物质掺烧方式、一次风温以及一次风速的变化特性。研究结果表明,与燃烧纯煤相比,掺烧生物质后炉膛出口烟温有所降低,炉膛出口NO浓度也降低。随着生物质掺烧位置的提高,炉膛出口烟温呈现上升趋势,而炉膛出口NO浓度呈现下降趋势。小范围内改变一次风温、风速对于炉膛出口NO的生成影响极小。实际锅炉掺烧生物质运行时,从抑制炉膛出口受热面结焦角度,应采用下层燃烧器掺烧;从降低炉膛出口NO排放角度,最上层燃烧器掺烧效果较好。研究结果为对冲燃烧锅炉掺烧生物质运行优化调整提供一定的指导。The effect of 10%biomass on the combustion characteristics of a 350 MW supercritical coal-fired boiler under 100%rated load(BRL)was investigated by the combination of swirl burner simulation and boiler furnace simulation.The variation characteristics of temperature field and atmosphere field in the furnace with biomass combustion method,primary air temperature and primary wind speed were analyzed.The results show that the smoke temperature and NO concentration at the furnace outlet are lower than that of pure coal.With the increase of the biomass blending position,the smoke temperature at the furnace outlet showed an increasing trend,while the NO concentration at the furnace outlet showed a decreasing trend.The change of primary air temperature and wind speed in a small range has little effect on the generation of NO at the furnace outlet.In the actual operation of the boiler mixed with biomass,the lower burner should be used in order to restrain the coking of the heating surface at the furnace outlet.From the Angle of reducing NO emission from the furnace outlet,the blending effect of the top burner is better.The research results provide some guidance for the optimization and adjustment of the operation of the mixed biomass combustion boiler.

关 键 词：生物质 掺烧 旋流燃烧器 数值模拟 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]