出口结构对CFB锅炉炉内顶部区域传热影响的初步研究  

The Heat Transfer in Top Region of CFB Boiler Burning Fujian Anthracite-A Modeling Study

作　　者：申良坤[1,2] 何宏舟[1] 过伟丽[1,2] 苏亚欣[2] 

机构地区：[1]集美大学机械工程学院,福建厦门361021 [2]东华大学环境科学与工程学院,上海201620

出　　处：《锅炉技术》2010年第4期27-31,共5页Boiler Technology

基　　金：福建省自然科学基金资助项目(E0740012);福建省科技创新平台项目资助(2009H2006);集美大学创新团队基金资助(2009A002);福建省科技计划重点项目资助(2006H0088)

摘　　要：引入颗粒返混系数,计算长曲率半径出口、长T型出口、平直拐角出口等3种特殊CFB锅炉出口条件下的顶部传热系数,并与光滑出口条件下传热系数计算结果进行对照。结果表明:在任意炉膛出口条件下,炉膛顶部区颗粒团对流传热系数随颗粒返混系数的增加而增加;炉膛顶部总传热系数随着炉膛温度的增加而线性增加;炉膛顶部总传热系数随着固体颗粒粒径的增大而减少,但当粒径超过300mm后,总传热系数减少的幅度变缓;顶部区颗粒团对流换热系数与总传热系数均随物料循环流率的增加而增大。Through introducing the solids reflux ratio,the heat transfer coefficient in the top region of CFB boiler of three kinds riser exit,including the long radius bend exit、the long extension blind T、and the bend/right angle exit,were calculated and compared with the results from that of the sooth riser exit.Numerical simulation indicated that：at the condition of same riser exit,the convective heat transfer coefficient of the cluster in the top region of CFB would increase with the increasing of solids reflux ratio;the radiation heat transfer coefficient of cluster and the bed-to-wall heat transfer coefficient in the top region would increase linearly with the increasing of combustion temperature,the bed-to-wall heat transfer coefficient in the top region would decrease with the increase of particles＇diameter; however ,when the particles＇diameter is bigger than 300um ,the increase tendency of the bed-to-wall heat transfer coefficient in the top region would become slowly;both of the convective heat transfer coefficient of cluster and the total heat transfer coefficient in the top region would increase with the increasing of the circulation ratio.

关 键 词：CFB锅炉 福建无烟煤 顶部区域 传热模型 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]