操作参数对N阀流动行为影响的数值模拟  

Numerical Study of the Effect of Operation Parameters on the Gas-solid Flow Characteristics in an N-type Loop-seal

作　　者：王庆功[1] 吕俊复[1] 杨海瑞[1] 张缦[1] 肖峰[2] 王冬福[2] 黄建荣[2] 

机构地区：[1]清华大学热能工程系、热科学与动力工程教育部重点实验室,北京100084 [2]上海锅炉厂有限公司,上海200245

出　　处：《锅炉技术》2014年第1期42-46,67,共6页Boiler Technology

基　　金：国家“十二·五”科技支撑计划项目(2012BAA02B01)

摘　　要：运用计算颗粒动力学(Computation Particle Fluid Dynamics)Barracuda软件对一种低流动阻力的N型回料阀内的气固流动特征进行了数值模拟研究,研究了操作参数(充气量以及松动风比例等)的变化对其流动特征和返料特性的影响,并与U阀进行了对比。结果发现,随着总返料充气量的增加,N阀所能传递的颗粒返料率逐渐增加;保持总返料充气量不变,增加N阀松动风的比例,颗粒循环流率也逐渐增加,但相同条件下N阀的颗粒循环流率要明显大于U阀,说明N阀倾斜段的设计降低了回料阀的阻力,并减少了对松动风量的依赖。N阀的气体反窜明显低于U阀。The gas-solid flow characteristics in a new type loop-seal （N loop-seal） with low flow resistance was mainly studied by Computation Particle Fluid Dynamics numerical meth- ods in this paper. The influence of operation parameters such as the aeration rate and the pro- portion of the loose-air to the gas-solid flow fields and the particle circulation rates were main- ly concerned. The results were compared between N loop-seal and the U loop-seal. The re- suits showed that the particle circulation rate increased with the total aeration rate and/or the proportion of the loose-air. N loop-seal had an advantage over the U loop-seal under the same condition. The improved slope structure of the supply chamber in N loop-seal reduced the flow resistance and the reliance to the loose-air rate. The gas inverse flow in N loop-seal is much less than that in U loop-seal.

关 键 词：N型回料阀 U型回料阀 气固流动 气体反窜 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]