摘要
针对某660 MW前后墙旋流对冲燃烧锅炉出现空气预热器入口和水冷壁两侧墙贴壁CO质量浓度较高的现象,结合就地勘测及性能试验数据进行了分析,并开展了燃烧优化试验。在静态燃烧调整的基础上,建立C层层操二次风门挡板开度与机组负荷的函数关系,并用机组负荷来修正原始逻辑中C层层操二次风门挡板开度。结果表明:造成空气预热器入口和水冷壁两侧墙贴壁CO质量浓度较高的原因是煤粉偏细、燃烧器与分离燃尽风的就地调整方式不合理以及C层层操二次风门挡板开度过大;高负荷下空气预热器入口CO质量浓度可以降至300 mg/m^(3)以内,水冷壁两侧墙的贴壁CO质量浓度从58000 mg/m^(3)以上降至12000 mg/m^(3)以内;逻辑优化后机组在动态过程中降低了CO排放,燃烧优化效果较为明显。
Aiming at the phenomenon of high CO mass concentration at the inlet of air preheater and near the side wall in a 660 MW opposed swirl firing boiler,an analysis was conducted combined with on-site survey and performance test data,in addition,an experiment of combustion optimization was carried out.On the basis of static combustion adjustment,the functional relationship between the opening of layer-operated secondary air damper on C layer and unit load was established,and the opening of the damper under the original logic was corrected according to unit load.Results show that reasons for high CO mass concentration at the inlet of the air preheater and near the side wall are low fineness of pulverized coal,unreasonable local adjustment of the burners and separated over fire air(SOFA),and excessive opening of layer-operated secondary air damper on C layer.Moreover,under the condition of high unit load,CO mass concentration at the inlet of the air preheater can be reduced to less than 300 mg/m^(3) while that near the side wall can be decreased from above 58000 mg/m^(3) to less than 12000 mg/m^(3).After logic optimization,CO emission of the unit in dynamic process is reduced,which shows that the effect of combustion optimization is obvious.
作者
何翔
马达夫
金晶
HE Xiang;MA Dafu;JIN Jing(Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China;School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2021年第7期533-541,共9页
Journal of Chinese Society of Power Engineering
基金
国家电力投资集团公司科技资助项目(201805559)。
关键词
锅炉
旋流对冲燃烧
燃烧优化
CO质量浓度
boiler
opposed swirl firing
combustion optimization
CO mass concentration
作者简介
何翔(1982-),男,重庆人,高级工程师,博士研究生,研究方向为大型电站锅炉燃烧优化技术。电话(Tel.):13524209466,E-mail:seanjastyt@163.com。
