摘要
为解决东方百万千瓦机组锅炉管壁超温的问题,以东方超超临界百万机组锅炉为研究对象,分别进行了1 000 MW和500 MW负荷的运行试验,研究了管壁温度分布规律及燃烧器拉杆位置和燃尽风配风方式对管壁温度分布的影响特性。结果表明,燃烧器(燃尽风)拉杆采取U型配风方式时,将会导致中间区域受热面管壁温度高,管壁温度呈现出"倒U型"的分布规律;开大中间区域燃烧器(燃尽风)拉杆位置,有助于缓解管壁超温。根据该研究成果,解决了某机组高温再热器管壁超温导致再热蒸汽不足的问题,额定负荷下,再热蒸汽温度由优化前的603.4℃提高至优化后的616.9℃;同时,解决了另一机组低负荷下屏式过热器管壁超温的问题,500 MW负荷、AEF磨煤机组合运行方式下,屏式过热器管壁最高点温度值由616.3℃降低至600.5℃,大大提高了管材的安全裕量。
In order to solve the problem of over-temperature on the tube wall of Dongfang million-watt unit,this paper takes Dongfang ultra-supercritical million-watt unit boiler as the research object,carries out the adjustment tests of 1 000 MW and 500 MW load,respectively,and studies the influence characteristics of the temperature distribution on the tube wall and the position of the burner tie rod and the distribution mode of exhaust air on the temperature distribution on the tube wall.The results show that when the pull rod of burner(exhaust air) adopts U-type air distribution mode,the wall temperature of the heating surface in the middle area will be higher,showing an inverted U-type distribution law.And opening the pull rod position of burner(exhaust air) in the middle area will help to alleviate the over-temperature of the tube wall.According to the results,the problem of insufficient reheat steam caused by the overheating of the reheater tube wall of another unit is solved.Under the rated load condition,the reheated steam temperature is increased from 603.4 ℃ before optimization to 616.9 ℃ after optimization.At the same time,the problem of over-temperature of tube wall of Panel Superheater under low load of a certain unit is solved.Under the combined operation mode of 500 MW load and AEF mill,the maximum temperature of tube wall of Panel Superheater is reduced from 616.3 ℃ to 600.5 ℃ which greatly improves the safety margin of tube.
作者
王小华
赵鹏
刘瑞鹏
梅振锋
WANG Xiao-hua;ZHAO Peng;LIU Rui-peng;MEI Zhen-feng(Suzhou Branch,Xi'an Thermal Power Research Institute Co.Ltd.,Suzhou,China,215153)
出处
《热能动力工程》
CAS
CSCD
北大核心
2019年第11期131-139,145,共10页
Journal of Engineering for Thermal Energy and Power
关键词
超超临界机组
直流锅炉
前后墙对冲
管壁温度
超温
CO含量
优化配风
Ultra supercritical unit
once through boiler
front and rear wall hedge
wall temperature
over temperature
CO emission
optimized air distribution
