烟气飞灰对锅炉尾部烟道磨损数值模拟  

Numerical simulation of fly ash erosion on bolier tail flue channel

作　　者：周梦伟 牛国平[1] 贾光瑞 罗志[1] 谭增强[1] 杨晓刚[1] ZHOU Mengwei;NIU Guoping;JIA Guangrui;LUO Zhi;TAN Zengqiang;YANG Xiaogang(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》2019年第8期62-67,共6页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ14-H10)~~

摘　　要：为解决燃煤锅炉尾部烟道的磨损问题,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,寻找实际运行中烟道严重磨损的位置,并以某超临界660 MW燃煤机组锅炉为例进行模拟。模拟结果发现,磨损主要集中在锅炉尾部水平段烟道下壁面、上升段烟道转角、水平段导流板及上升段涡盘,磨损率最大值达到1.94×10^–5 kg/(m^2·s),而实际情况为该机组运行6个月发现水平烟道下壁面磨穿至保温层,导流板及涡盘磨损至撕裂和消失,模拟结果与实际情况一致。In order to solve the wear problem occurs on tail flue of coal-fired boilers,this paper simulates the gas-solid two-phase flow field and predicts the erosion situation by computational fluid dynamics(CFD),and finds out the location of severe wear in actual operation.Moreover,numerical simulation was carried out by taking a supercritical 660 MW coal-fired boiler as an examplec.The results show that,the wear mainly concentrates on the lower wall of the horizontal flue,the corner of the rising flue,the diversion plate of the horizontal section and the vortex disc of the rising section,with the maximum wear rate reaching 1.94×10^–5 kg/(m^2·s).The actual situation is that the lower wall of the horizontal flue weared through the insulation layer,the diversion plate and the scroll disc basically disappeared after 6 months’operation.The simulation results are consistent with the actual situation.

关 键 词：燃煤锅炉 尾部烟道 磨损 气固两相流 CFD 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]