大型循环流化床锅炉外置换热器运行特性分析  

Operation Characteristics of Fluidized Bed Heat Exchanger of Large-scale Circulating Fluidized Bed Boiler

作　　者：张缦[1] 吴海波[2] 孙运凯[1] 吕清刚[1] 

机构地区：[1]中国科学院工程热物理研究所,北京市海淀区100190 [2]中国科学院研究生院,北京市海淀区100049

出　　处：《中国电机工程学报》2012年第14期42-48,共7页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划重点基金资助项目(2006BAA03B06);中国科学院知识创新工程重要方向项目(KGCX2-YX-399+3)~~

摘　　要：为掌握大型循环流化床(circulating fluidized bed,CFB)锅炉外置换热器(fluidized bed heat exchanger,FBHE)的运行特性,在2台实际运行的300MW CFB锅炉上进行了运行特性测试研究,包括FBHE对CFB锅炉床温、汽温的调节及其传热特性的研究。结果表明:带FBHE的CFB锅炉炉膛温度沿炉膛高度分布比较均匀,且在60%锅炉最大连续蒸发量(boiler maximum continue rate,BMCR)以上运行时床温无明显变化,而无FBHE的CFB锅炉床温随负荷变化明显,炉膛温度沿炉膛高度差别较大,且随着锅炉负荷的降低,差别更明显;锥型阀的开度随锅炉负荷的增加而增大;在负荷不变的情况下,过热器的喷水量和再热器的吸热量随床温的升高递减,但减少幅度较小;不同负荷下FBHE内不同受热面的传热系数不同,其值均随负荷的增加单调增大。In order to investigate the operation characteristics of fluidized bed heat exchanger（FBHE） of large-scale circulating fluidized bed（CFB） boiler,experiments were conducted on two 300 MW CFB boilers which have been put into commercial operation,including the effect of FBHE on the adjustment characteristics of furnace temperature and steam temperature of CFB boiler and heat transfer characteristics of FBHE.The results indicate that the furnace temperature of CFB boiler with FBHE is quite even along the height direction,and there is almost no change in temperature when the boiler operates at above 60% boiler maximum continue rate（BMCR）,whereas the furnace temperature of CFB boiler without FBHE is quite different,such difference becomes more obvious with the boiler load decreasing.The opening of cone valve increases monotonously along with the boiler load increasing.In the condition of constant load,when the bed temperature rises superheater water spray and reheater heat absorption decreases but at a relatively low degree.At different boiler loads,the heat transfer coefficients of the different heating surfaces in FBHE of CFB boiler are different,which increase monotonously with the boiler load increasing.

关 键 词：外置换热器 循环流化床锅炉 床温 汽温 运行特性 

分 类 号：TK123[动力工程及工程热物理—工程热物理]