摘要
切向燃烧的电站锅炉将水平浓淡低NO x燃烧器与顶部燃尽风同时使用,即综合空气分级燃烧技术,可有效地降低NO x排放。对350 MW电站锅炉数值计算结果表明:常规直流煤粉燃烧器改造成低NO x燃烧器,可降低NO排放浓度7%;对于同一种燃烧器采用OFA可降低NO排放浓度9%;同时使用低NO x燃烧器和OFA,可降低NO排放浓度18%。水平浓淡低NO x燃烧器与周界风偏置等设计,在提高燃烧稳定性、预防炉壁结焦腐蚀等方面有诸多优点。对造成的飞灰含碳量增加,本文给出了合理的指导建议。
The multistage air combustion technology in the tangentially PC-fired utility boiler,utilizing both the horizontal bias PC low NO x burner and over firing air,could reduce the NO x emission effectively.Numerical simulations of a 350 MW utility boiler have been done.And the results show:NO x emission can be reduced by 7%when the conventional burner is displaced with the low NO x burner;and its NO x emission can be reduced by 9%when used OFA in same burner;furthermore NO x decreases 18%meanwhile applied both the low NO x burner and OFA.The horizontal bias PC low NO x burner and the deflectable deposited perimeter air could improve combustion stability and prevent corrosion coking of furnace walls.Besides,this article makes reasonable suggestions for the large carbon content in fly ash brought forth by this technology.
作者
吴岩
WU Yan(State Power Investment Group Inner Mongolia Energy Co.,Ltd.,Tongliao 028000,China)
出处
《锅炉技术》
北大核心
2019年第6期50-54,共5页
Boiler Technology
