600MW机组锅炉低温再热器连接管磨损的模拟分析  

SIMULATION AND ANALYSIS ABOUT WORN-OUT ON CONNECTING PIPE OF LOW-PRESSURE REHEATER FOR A BOILER OF 600 MW UNIT

作　　者：李相鹏[1] 高增梁[1] 陈江[1] 周昊[2] 岑可法[2] 

机构地区：[1]浙江工业大学机电工程学院,浙江杭州310032 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《热力发电》2009年第2期54-58,共5页Thermal Power Generation

基　　金：中国博士后科学基金资助项目(2005038623);国家自然科学基金资助项目(60534030)

摘　　要：采用三维模型对600 MW机组锅炉烟道气相流场分布、飞灰运动和浓度分布等对炉膛出口附近低温再热器连接管束的磨损进行了模拟分析。结果表明,受烟道气固两相流分布的影响,在炉膛出口处烟气具有较大的速度、颗粒浓度和颗粒平均碰撞速度,从而使低温再热器连接管磨损速率较大。对此,建议在第1排连接管底部和连接管之间的水平低温再热器I管束迎风面安装6 mm厚的防磨瓦,在其余部位安装3 mm厚的防磨瓦,以改善磨损。By adopting three - dimentional model,the simulation and analysis of worn out on connecting pipe bundle of low- pressure reheater nearby the furnace outlet suffured from gas - phase flow field distribustion, movemcnt of flyash, and concentration distribu- tion etc. in the flue duct of boiler concerning 600 MW unit have been carried out. Results show that the flue gas velocity,particle＇s concentration and average collision velocity of particles nearby the furnace outlet all are larger due to influence of solid - gas two - phase flow distribution in the flue duct,thereby,the velocity of wornout on connecting pipes of the low pressure reheater is also larger. It is recommended to install wornout - resistant covers of 6 mm thickness onto the windward surface of horizontal I - shaped pipe bundle of the low- pressure reheater between bottom of the first row connecting pipe and the other connecting pipes,as well as instal- ling wornout - resitant covers with 3 mm thickness onto the other remained parts.

关 键 词：600 MW机组 锅炉 再热器 连接管 磨损 模拟 防磨措施 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]