基于返料灰温偏差的600MW(e)循环流化床锅炉内气固不均匀分布  

Analysis of Non-uniform Distribution of Gas-Solid Flow in the 600MW(e) CFB Boiler Based on the Non-uniform Distribution of Returning Ash Temperature

作　　者：莫鑫[1] 蔡润夏 吕俊复[1] 杨海瑞[1] 雷秀坚 凌文[2] 苏虎 周琪 

机构地区：[1]清华大学热能工程系,北京市海淀区100084 [2]四川白马循环流化床示范电站有限责任公司,四川省内江市641000 [3]东方电气集团东方锅炉股份有限公司技术中心,四川省成都市611731

出　　处：《中国电机工程学报》2016年第8期2175-2180,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(2014CB744305)~~

摘　　要：亚临界循环流化床锅炉和超临界循环流化床锅炉均采用多个并联分离器分离烟气中的灰颗粒,而这种布置往往造成气固两相在并联分离器内的分布不均匀。文中分析了600MW(e)循环流化床锅炉内不同返料阀内返料灰温,比较不同位置的灰温随锅炉负荷的变化。采用灰温分布表征气固两相在并联分离器内的不均匀分布。研究发现,600MW(e)循环流化床锅炉内气固流动不均匀主要集中在同侧墙的3个分离器内。通过同侧墙3个分离器的返料灰的温度明显不同,而通过不同墙同位置分离器的返料灰的温差较小。进一步分析发现,后墙集气箱的布置方式使得各个并联分离器的压力出口不同,导致各个并联分离器的压降不同,进而导致各个分离器内气固流量不同。The parallel cyclones with identical geometries have been widely used to separate solids from flue gas in the sub-critical CFB boilers and sup-critical CFB boilers, however the gas-solid flow through the parallel cyclones may be non-uniform. This paper collected the ash temperature in the returning valve of the 600MW（e） CFB boiler, and analyzed the ash temperature distribution in six parallel returning valves. The ash temperature distribution could reflect the non-uniform gas-solid flow in parallel cyclones. The ash temperature difference through the cyclones in the same side is greater than those in different sides, indicating the severer non-uniform gas-solid flow. Due to the gas collecting box in the rear wall, the pressure outlets for cyclones in the same side are different, leading to the different pressure drops. For the same geometries the different pressure drops would lead to the non-uniform gas-solid flow in parallel cyclones.

关 键 词：循环流化床锅炉 并联分离器 气固两相不均匀分布 返料灰温 集气箱 

分 类 号：TK22[动力工程及工程热物理—动力机械及工程]