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中南大学学报(自然科学版)

Journal of Central South University

第40卷    第2期    总第186期    2009年4月

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文章编号:1672-7207(2009)02-0417-05
600 MW机组锅炉省煤器出口后包覆管磨损分析
李相鹏1, 2,陈 江1, 2,高增梁1, 2,周 昊3,岑可法3

(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)

摘 要: 采用三维模型对600 MW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15 m/s,而颗粒在管束上碰撞最大速度也超过10 m/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1 mm/a,最大值达到3 mm/a。

 

关键词: 锅炉管;磨损;模拟

Erosion analysis of 600 MW boiler tubes at exit of economizer
LI Xiang-peng1, 2, CHEN Jiang1, 2, GAO Zeng-liang1, 2, ZHOU Hao3, CEN Ke-fa3

1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China; 2. Key Laboratory of Mechanical Manufacture and Automation of Ministry of Education, Zhejiang University of Technology, Hangzhou 310032, China; 3. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Abstract: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.

 

Key words: boiler tubes; erosion; simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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