600MW机组锅炉省煤器出口后包覆管磨损分析  

Erosion analysis of 600 MW boiler tubes at exit of economizer

作　　者：李相鹏[1,2] 陈江[1,2] 高增梁[1,2] 周昊[3] 岑可法[3] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310032 [2]浙江工业大学教育部机械制造与自动化重点实验室,浙江杭州310032 [3]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《中南大学学报（自然科学版）》2009年第2期417-421,共5页Journal of Central South University:Science and Technology

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600MW锅炉内部气固两相流场进行模拟,研究锅炉烟道烟气流场分布、飞灰运动和浓度分布等因素对烟道尾部锅炉管束的磨损的影响。根据模拟分析的结果,提出相应的防磨优化措施。研究结果表明,受附壁效应的影响,后包覆管处靠近后墙和侧墙的烟气中飞灰浓度较大,同时,由于烟道尾部气流通道变窄,气流速度增大,使颗粒在后包覆管上碰撞速度增大,管束上方气流速度最大值达到15m/s,而颗粒在管束上碰撞最大速度也超过10m/s,因此,引起后包覆管处磨损速率较大,第1层管束较大面积内磨损速率达到1mm/a,最大值达到3mm/a。A three-dimension model was employed to simulate the gas-solid two-phase flow in a 600MW boiler, and the influences of the gas flow fields, particles motions and particles concentration on the erosion of the boiler tubes at the exit of economizer were studied. Anti-erosion measures were presented based on the simulation results. The results show that due to the Coanda effect, relatively high particle concentration appears in the flue gas near to the side wall and end wall; meanwhile, the gas velocity increases remarkably for the narrowed flue pass at the end of the duct, which induces high impacting velocity of particles on boiler tubes. The maximum velocity of the gas above the tubes reaches 15 m/s, and the maximum velocity of the particles impacted on the tubes is over 10 m/s as well, resulting in a high erosion rate of tubes. The erosion rate of the first layer is primarily 1 mm/a, and the maximum value even reaches 3 mm/a.

关 键 词：锅炉管 磨损 模拟 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]