百叶窗煤粉浓缩器两相流场速度分布的实验研究  

Experimental Study on Velocity Distribution of the Gas-Solid Two Phase Flow in a Louver Coal Concentrator

作　　者：管晓艳[1] 孙绍增[1] 郝伟[1] 陈力哲[1] 王正阳[1] 孙锐[1] 

机构地区：[1]哈尔滨工业大学燃烧工程研究所,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2010年第26期75-81,共7页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2007AA05Z336)~~

摘　　要：百叶窗煤粉浓缩器作为水平浓淡燃烧技术的关键部件已在电站锅炉中得到了广泛应用。为深入研究百叶窗煤粉浓缩器的气固分离机制,采用粒子动态分析仪(particle dynamics analyzer,PDA)对百叶窗煤粉浓缩器内气固两相流动进行了测量,获得了浓缩器典型截面区域、叶片表面附近及浓侧出口区域的流场分布。实验结果表明,叶片表面附近颗粒与叶片的碰撞反弹及两级叶片之间的气固速度滑移是形成浓缩器内颗粒浓缩的本质所在;叶片只浓缩叶片附近区域的颗粒,而对远离叶片的浓侧区域则影响较小;浓侧壁面磨损区域主要发生在末级叶片喉口到距喉口0.7a(a为浓缩器的宽度)范围内,在浓缩器的应用中需考虑此处的防磨措施。As a key part of the horizontal bias combustion（HBC） technology,the louver coal concentrator has been developed and successfully applied to many large-scale utility boilers.The gas-solid two phase flow was investigated using particle dynamics analyzer（PDA） to study the gas/solid separation mechanism in a louver coal concentrator.Gas-solid two phase field in typical sections,near the blade surface and fuel-rich side exit of the louver coal concentrator were obtained.The results show that the particle concentrate in the louver coal concentrator due to the collision between particles and the blade near the blade surface as well as gas-solid velocity slip between two blades.Blades concentrate particles near the blade and influence little in the zones away from blades.The erosion wall area in fuel-rich side exists between the last blade to 0.7a（＂a＂ is the width of the louver coal concentration ） away from it and anti-erosion measures should be considered in application.

关 键 词：百叶窗 煤粉浓缩器 气固两相流动 实验 

分 类 号：TK16[动力工程及工程热物理—热能工程]