弯头对煤粉浓淡分离器工作特性影响的数值模拟研究  

A SIMULATION STUDY ON THE SEPARATING PERFORMANCE OF AN IMPACT TYPE FUEL RICH-LEAN BURNER AFFECTED BY THE ELBOWS

作　　者：周昊[1] 岑可法[1] 樊建人[1] 池作和[1] 蒋啸[1] 

机构地区：[1]能源清洁利用和环境工程教育部重点实验室

出　　处：《中国电机工程学报》2003年第1期132-135,共4页Proceedings of the CSEE

基　　金：国家重点基础研究发展规划项目(G1999022204)。~

摘　　要：煤粉浓淡分离燃烧技术在低负荷稳燃、降低燃烧污染物排放等方面具有良好性能,得到广泛应用。由于四角切圆燃烧锅炉粉管布置要求,燃烧器前往往布置有弯头,弯头出口存在煤粉空气混合物速度和煤粉浓度分布的不均。该文采用试验和数值模拟方法,对一次风煤粉空气混合物流经弯头后形成的气、粉分布不均对浓淡分离器的工作特性的影响进行分析。试验和模拟结果表明,弯头结构和布置形式对煤粉浓淡分离器的分离效果、浓淡侧速度分布不均等都有重要影响。文中同时提出了具有前置弯头的浓淡分离器获得高分离效果及浓淡侧速度均衡的途径,为浓淡分离器的设计和运行提供参考。It is well known that the fuel rich-lean pulverized coal burner has some advantages in flame stability, low NOx emissions and therefore, it has been used widely in the utility boilers. But for the fitting requirements, there must be unavoidable elbows existing on the pipes before the separators that make a non-uniform field of the coal concentration and of air velocity. In order to evaluate the effect of the elbows on the separating performance of the burner, experimental and numeri-cal methods have been employed, the results show that such structure and arrangement affect the separating performance and the air velocity distribution on the rich and lean sides, and a way for solving the problem is also developed.

关 键 词：锅炉 煤粉浓淡分离器 弯头 工作特性 数值模拟 燃烧器 气固多相流 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]