摘要
以燃用高钠煤的660MW超超临界压力直流锅炉为例,对不同工况下垂直管屏水冷壁壁温分布特性进行了试验研究.结果表明:提高高钠煤的掺烧比例,可降低燃烧区域热负荷,有利于水冷壁壁温分布的均匀性;超临界压力下低负荷运行时,水冷壁壁温偏差值会增大,节流孔圈未完全发挥控制工质质量流量的作用是造成水冷壁壁温偏差较大的原因之一;通过调整锅炉运行方式,可在一定程度上改善水冷壁壁温分布的均匀性.
Taking the 660 MW ultra-supercritical once-through boiler burning high sodium coal as an example, the temperature distribution of its vertical tube water wall was experimentally investigated under different working conditions. Results show that the uniformity of wall temperature distribution can be improved by raising the blending ratio of high sodium coal, thus lowering the heat load in the combustion zone. At supercritical pressure but low load, the deviation of temperarture distribution increases, and one of the reasons is that the throttle orifice could not adjust the flow rate of working fluid as designed. The uniformity of wall temperature distribution can be improved to a certain degree by reasonably adjusting the boiler operation mode.
出处
《动力工程学报》
CAS
CSCD
北大核心
2017年第4期257-260,292,共5页
Journal of Chinese Society of Power Engineering
关键词
超超临界直流锅炉
高钠煤
水冷壁
壁温分布
ultra-supercritical once-through boiler
high sodium coal
water wall
temperature distribution
