颗粒层过滤除尘和分级过滤特性的数值模拟及实验对比  

SIMULATION RESEARCH ON THE MOVING GRANULAR BED DUST FILTER AND EXPERIMENTAL CONTRAST

作　　者：袁竹林[1] 许世森[2] 

机构地区：[1]东南大学热能工程研究所,南京210096 [2]国家电力公司热工研究院,西安710032

出　　处：《中国电机工程学报》2002年第4期41-45,共5页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费资助项目(G1999022104-4)

摘　　要：IGCC和PFBC-CC燃气蒸汽联合循环发电均涉及高温除尘问题,目前尚未取得突破。在高温条件下采用移动颗粒层过滤除尘具有潜在的发展优势,该文针对移动颗粒层过滤除尘机理进行了数值模拟和实验研究。在建立离散颗粒运动数学模型的基础上,模拟计算了粉尘颗粒与过滤层颗粒碰撞次数与系统风速之间的变化关系以及过滤介质颗粒与不同粒径粉尘颗粒间的碰撞机率,用数值模拟的方法探讨了过滤颗粒层对不同粒径粉尘颗粒的选择性,并与实验结果进行了对比。研究发现,随系统风速的变化,粉尘颗粒与过滤层颗粒的碰撞频次与除尘效率之间存在定性的一致,单一粒径颗粒组成的过滤层对不同粒径的粉尘颗粒有显著的选择性。Both IGCC and PFBC-CC relate to hot dust removal. At high temperature condition, the moving granular bed filter has its distinctive advantages. In this paper the mechanism of dust removal was studied by numerical simulation and experimental methods. A mathematics model to simulate the discrete particle behavior in a moving granular bed dust filter was established. It is found that the collision times between the dust particles and filter particles change with the dusty air velocity, the variation is qualitatively identical with the dust removal efficiency obtained by experiments. The filtration efficiency of granular bed for different size dust particles was also studied and compared with experiments.

关 键 词：颗粒层 过滤除尘 分级过滤特性 数值模拟 实验对比 燃煤发电 

分 类 号：TM611[电气工程—电力系统及自动化] X773[环境科学与工程—环境工程]