1000 MW对冲锅炉火焰中心高度调整试验研究
Experimental Study on Adjustment of Flame Center Height of a 1 000 MW Opposed Firing Boiler
葛铭 1常宝 2孙俊威 1刘涛 1陈辉 1陈智超3
作者信息
- 1. 国能南京电力试验研究有限公司,江苏 南京 210023
- 2. 国家能源集团科学技术研究院有限公司,江苏 南京 2100233
- 3. 哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001
- 折叠
摘要
为解决百万对冲锅炉折焰角腐蚀和炉内偏烧等问题进行了降火焰中心高度试验研究,通过调整二次风配风方式、风煤比、煤量分布、分离器转速等因素,发现了火焰中心高度和炉内偏烧的变化规律.试验发现,提高分离器转速和降低风煤比对于降低火焰中心高度的效果最为明显.二次风和煤量正宝塔分布对于降低火焰中心高度的影响较小.分离器转速提高有助于缓解烟温偏差,煤量正宝塔分布对于烟温偏差无明显改善.二次风分配下移对于主燃区烟温偏差有缓解作用,但燃尽风区域的烟温偏差反而加剧.粉量偏差严重的磨煤机其风煤比提高能够大幅缓解该区域的烟温偏差.为缓解炉内偏烧,同层燃烧器的风煤比应保持在同一水平,不宜偏差过大.火焰中心高度和烟温偏差变化规律为运行提供指导,有助于机组安全经济运行.
Abstract
The experimental study on reducing flame center height was carried out for solving the problems of flame angle corrosion and partial combustion on a one million opposed firing boiler.The effects of sec-ondary air distribution mode,air-coal ratio,coal quantity distribution and speed of separator on flame center height and partial combustion in furnace were studied.It is found that increasing the speed of sep-arator and reducing the air-coal ratio have the most obvious effect on reducing the flame center height.The secondary air distribution mode and pagoda distribution of coal quantity had little effect on reducing the flame center height.The increasing of separator speed contributed to alleviate the gas temperature de-viation.The distribution of coal quantity positive pagoda had no obvious improvement on the deviation of flue gas temperature.The downward shift of secondary air distribution had an alleviating effect on the gas temperature deviation in the main combustion zone,but the gas temperature deviation in the over-fire air zone was grave.The increasing of air-coal ratio of coal mill with serious powder deviation could greatly alleviate the gas temperature deviation in this region.In order to alleviate the partial combustion in the furnace,the air-coal ratio of the same layer burner should be kept at the same level.The deviation should not be too large.The transformation law of flame center height and gas temperature deviation pro-vided guidance for operation,which was helpful to the safe and economic operation of the unit.
关键词
对冲锅炉/火焰中心高度/烟温偏差/风煤比/配风方式/分离器转速Key words
opposed firing boiler/flame center height/gas temperature deviation/air-coal ratio/air distribution/speed of separator引用本文复制引用
出版年
2024
NETL
NSTL
万方数据