六回路环形炉膛循环流化床试验研究  

Experimental study on circulating fluidized bed with annular furnace and six cyclones

作　　者：王小芳[1] 帅大平[1,2] 吕清刚[1] 孙运凯[1] 王法军[1,2] 宋国良[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《洁净煤技术》2015年第2期30-34,共5页Clean Coal Technology

基　　金：中国科学院战略性先导科技专项资助项目(XDA07030100)

摘　　要：针对大型循环流化床锅炉存在的二次风穿透不佳、受热面布置困难等问题,提出了适用于600 MW等级及以上超(超)临界循环流化床锅炉的炉型——六回路环形炉膛循环流化床,并进行冷态试验研究,考查环形炉膛内气固流动特性和六回路间循环流率分布特性。结果表明:颗粒浓度沿环形炉膛高度的分布与矩形单炉膛相似,呈下浓上稀的指数型分布;随着流化速度的增大,炉膛下部密相区颗粒浓度减小,炉膛中上部和出口区域的颗粒浓度增大,各回路的循环流率均明显增大;随着静止料层高度的增大,整个炉膛高度的颗粒浓度都增大且高度越高处增幅越小;流化速度较低时循环流率不因静止料层高度的增大而变化,流化速度较高时循环流率随静止料层高度增大而稍有增大;六回路间循环流率的分布较均匀,设计工况下循环流率的相对偏差为4.5%;环形炉膛内环长边壁面悬吊屏对循环流率的大小和分布影响较小。In order to improve secondary air penetration and optimize heating surface disposition,a circulating fluidized bed（ CFB）with annular furnace and six cyclones was proposed which was suitable for 600 MW or larger supercritical CFB boilers. The cold experiments were conducted to investigate gas-solid flow in the annular furnace and distribution of circulating rate among six cyclones. The results showed that the distribution of particles in annular furnace was similar to that in single loop CFB with conventional furnace. The concentra-tion of particle decreased along with the increase of furnace height and the distribution presented exponential type. The concentration of particle in the bottom of furnace decreased with the increase of superficial gas velocity,while the concentration of particle in the middle and top as well as outlet changed in the opposite trend. The circulating rate of each cyclone increased obviously. With the increase of static ma-terial layer height,the concentration of particles in the whole furnace rose,while the increase rate of concentration reduced in a higher height. When the superficial gas velocity was lower,the circulating rate didn’t vary with the increase of static material layer height. When the superficial gas velocity was higher,the circulating rate presented a slight increase with the rise of static material layer height. The distri-bution of circulating rates among six cyclones was almost uniform. The deviation of six circulating rates was 4. 5% under design condition. The inserted heat exchanger panels had little influence on the distribution of circulating rate.

关 键 词：环形炉膛 六分离器 颗粒浓度 循环流率 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]