飞灰分布对烟冷器的磨损研究及工程实践  

Research and engineering practice for the effect of fly ash distribution on wear of flue gas cooler

作　　者：牛国平[1] 周梦伟 杨晓刚[1] 钞永顺 李海浩 贾光瑞 谭增强[1] NIU Guoping;ZHOU Mengwei;YANG Xiaogang;CHAO Yongshun;LI Haihao;JIA Guangrui;TAN Zengqiang(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Huaneng Tongchuan Zhaojin Coal&Electricity Co.,Ltd.,Tongchuan 727100,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]华能铜川照金煤电有限公司,陕西铜川727100

出　　处：《热力发电》2021年第5期139-146,共8页Thermal Power Generation

基　　金：清华大学-中国华能集团有限公司基础能源联合研究院资助(U20YYJC01)。

摘　　要：针对目前燃煤锅炉空气预热器出口烟道烟冷器换热管束的磨损问题,利用计算流体力学(CFD)软件进行气固两相流场模拟和磨损预测,研究分析飞灰分布对烟冷器的磨损影响,提出针对性的解决方案,并以国内某燃煤机组为例进行了改造前、后的数值模拟研究。结果表明:改造前、后,飞灰质量浓度相对标准偏差左侧由77.29%下降至43.22%,右侧由69.45%下降至47.32%;首排管磨损速度最大值由1.51×10^(-6)kg/(m^(2)·s)下降至6.98×10^(-7)kg/(m^(2)·s);飞灰分布与烟冷器磨损有着较大的相关性。In view of the wear problem of heat exchange tube bundle of the flue gas cooler at the outlet of air preheater of the coal-fired boiler at present,the computational fluid dynamics(CFD)software is used to simulate the gas-solid two-phase flow field and predict the wear.The influence of fly ash distribution on wear of the flue gas cooler is studied,and the corresponding solutions are put forward.Moreover,a coal-fired unit in China is taken as an example to carry out the numerical simulation before and after the reformation.The result shows that,before and after the reformation,the relative standard deviation of fly ash concentration on the left side decreased from 77.29%to 43.22%and that on the right side standard decreased from 69.45%to 47.32%.The maximum wear rate of the first row of pipes decreased from 1.51×10^(-6)kg/(m^(2)·s)to 6.98×10^(-7)kg/(m^(2)·s).There is a great correlation between the distribution of fly ash and the wear of flue gas cooler.

关 键 词：燃煤锅炉 飞灰分布 烟冷器 磨损 气固两相流 数值模拟 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]