300MW亚临界锅炉NO_x排放量和机组经济性的综合治理  

Comprehensive Management on NOxEmissions and Unit Economics for 300 MW Subcritical Boiler

作　　者：宋大勇[1] 张家维[1] 吴炬[1] 张振杰[1] 吴景兴[1] 

机构地区：[1]辽宁省电力有限公司电力科学研究院,辽宁沈阳110006

出　　处：《东北电力技术》2013年第3期19-22,共4页Northeast Electric Power Technology

摘　　要：分析了燃煤火力发电厂NOx产生机理及影响因素,指出煤质、炉内燃烧温度、氧浓度及分布状况是影响NOx生成量最直接因素。对于已投产机组,控制运行氧量、实现空气分级燃烧、优化磨煤机组合方式是降低NOx排放量的主要措施。通过降低运行氧量1%～1.5%,NOx排放量可下降10%～40%,供电煤耗下降1～2 g/kWh;通过加强空气分级燃烧,NOx排放量可下降10%～40%,供电煤耗变化不大。采用下4台磨煤机组合方式,NOx排放量可下降50～100 mg/Nm3。The paper analyses NO_x generating mechanism and the influence factors in the thermal power plant, and points out that the coal, combustion temperature, oxygen concentration and distribution are the direct cause of producing NO_x in coal-fired power plants. For operation unit, controlling the oxygen operation, air staging and optimizing coal mill combination are main measures to reduce NO_x emissions. By lowering oxygen operation 1% -1.5%, NO_x emissions can drop 10% -40%, The power supply coal consumption can drop 1 - 2 g/kWh; By strengthening air staging, NO_x emissions can drop 10% -40%, the power supply coal consumption change is great. By adopting the lower 4 station coal mill combinations, NOx emissions can drop 50 - 100 mg/Nm3.

关 键 词：NO_x经济性 氧量 空气分级 磨煤机组合方式 

分 类 号：TM621.2[电气工程—电力系统及自动化]