摘要
常规墙式燃烧锅炉单层燃尽风布置方式存在燃尽风对整个炉膛横断面的覆盖度较低,燃尽风与烟气混合程度较弱,NOx排放浓度较高的缺陷。为此,以国电蚌埠发电有限公司(蚌埠电厂)一期超临界2×600MW机组锅炉为例进行燃烧方式改造。结果表明,设置双级燃尽风不仅能够增大燃尽风总量,而且使锅炉NOx排放浓度降低20%左右。同时,由于2层燃尽风喷口错列布置,扩大了气流对炉膛断面的覆盖范围,增强了燃尽风与炉内烟气的混合强度,使未燃尽物在有限的高度内充分燃烧,提高了锅炉燃烧效率。
Drawbacks such as low over-fire air(OFA) coverage in the whole furnace cross section,weak mixing between OFA and the flue gas,and the high NOx emission occur in the conventional wall-firing boiler with single stage OFA.Thus,two-stage OFA was experimentally studied by taking the supercritical 2×600 MW units boiler of first phase project in Guodian Bengbu Power Generation Co.,Ltd.as the object.Results show that,setting two-stage OFA not only can increase the total OFA volume so as to decrease the NOx emission by about 20%,but also can improve the boiler combustion efficiency because staggered arrangement of two layers of OFA nozzles expands the airflow coverage in the furnace cross section,and enhances the mixing between the OFA and flue gas,enabling the unburnt matter fully combust within limited height.
出处
《热力发电》
CAS
北大核心
2012年第9期72-75,共4页
Thermal Power Generation
