N阀和U阀内流动结构比较的数值模拟  

Comparisonof the Gas-solid Flow Characteristics between an N Loop-seal and U Loop-seal with Numerical Simulation

作　　者：王庆功[1] 汪佩宁[1] 杨海瑞[1] 张缦[1] 肖峰[2] 李炳顺[2] 姜雯雯[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》2013年第5期22-26,共5页Boiler Technology

基　　金：国家“十二五”科技支撑计划项目(2012BAA02B01)

摘　　要：采用计算颗粒动力学(CPFD)方法对一种新型低流动阻力N型回料阀内的气固流动特征进行了数值模拟研究,通过考察其颗粒返料率、压力分布及气体反窜情况等参数,论证了其流动阻力特点,并与传统的U型回料阀进行了对比,从而验证了N阀替代U阀用于循环流化床锅炉的可行性。结果表明,N阀在提高颗粒返料率、避免气体反窜上存在明显优势,N阀倾斜段的设计显著降低了回料阀内的气固流动阻力。The gas-solid flow characteristics in a novel N type loop-seal with lower flow re- sistance was investigated numerically with Computational Particle Fluid Dynamics （CPFD） methods in this paper. The gas-solid flow characteristics in the N loop-seal was predicted and compared with the traditional U loop-seal with same key geometrical size. Parameters inclu- ding particle flow rate, pressure distributions and the gas inverse flow phenomenon were mainly concerned. The feasibility of replacing the U loop-seal by N loop-seal in the circulating fluidized bed boiler was demonstrated. The prediction results showed that the N loop seal was of obvious advantages on enhancing the particle flow rate and reducing the gas inverse flow rate due to the improved slope structure of the supply chamber.

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]