速差射流煤粉燃烧器燃烧过程理论分析(Ⅰ)——强化燃烧原理分析  

Theoretical Analysis of Combustion Process in Pulverized Coal Fired Burner Using Jets with Velocity Difference(Ⅰ) ——Analysis of Combustion Intensification

作　　者：侯凌云[1] 张拥军 傅维标[1] 

机构地区：[1]清华大学工程力学系,北京100084 [2]凡口铅锌矿,韶关512325

出　　处：《燃烧科学与技术》2000年第2期111-114,共4页Journal of Combustion Science and Technology

摘　　要：采用两相湍流流动的双流体模型 ,对带有中心高速射流的速差射流煤粉燃烧器进行了模拟计算。计算结果表明 ,燃烧器内筒端面与喷口间的距离 x有一最佳值 ,此时的高温回流量达到最大 ,煤粉燃烧的强化效果最好 ;另外 ,在该燃烧器中 ,中心高速射流能够浓缩煤粉 ,但约束煤粉扩展及增加高温烟气回流的作用不明显 ,只能使一次风粉与已回流的高温烟气混合更好 。WT5”BZ]This paper simulates pulverized coal fired burners using the central jet with a large velocity difference by means of a multifluid model for two phase turbulence flows.The predicted results show that the distance,x,between the nozzle and the side of the inner combustion chamber has an optimum value,where the largest recirculation amount of high temperature gases and the best intensification effect of pulverized coal combustion can be achieved.Furthermore,the central jet with a large velocity difference can concentrate pulverized coal,but the effect of restricting the extension of pulverized coal and increasing the recirculation amount of high temperature gases is not remarkable,and the mixing of the primary air and coal with recirculated high temperature gases will be better,which makes the temperature more uniform. [WT5”HZ]

关 键 词：速差射流 煤粉燃烧器 数植模拟 回转水泥窑 燃烧过程 

分 类 号：TQ172.625[化学工程—水泥工业] O643.21[化学工程—硅酸盐工业]