燃烧器偏转解决对冲燃烧锅炉高温腐蚀及颗粒冲刷技术研究  

Research on burner deviation for mitigating high-temperature corrosion and particle erosion in opposed wall combustion boiler

作　　者：廖伟辉[1] 阮志龙 吕兴城 饶勇 马帅[2] 方庆艳 姚斌[2] LIAO Weihui;RUAN Zhinglong;LYU Xingcheng;RAO Yong;MA Shuai;FANG Qingyan;YAO Bin(Guangdong Honghaiwan Power Generation Co.,Ltd.,Shanwei 516000,China;School of Energy and Power Engineering,HuazhongUniversity of Science and Technology,Wuhan 430074,China)

机构地区：[1]广东红海湾发电有限公司,广东汕尾516000 [2]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《热力发电》2023年第7期191-199,共9页Thermal Power Generation

摘　　要：为有效缓解某电厂660 MW机组前后墙对冲燃烧锅炉两侧墙水冷壁高温腐蚀及煤粉颗粒冲刷磨损问题,结合高温腐蚀的原因及机理,并根据现场设备情况,提出将靠近两侧墙的旋流燃烧器角度向炉内中心偏转3.5°。对燃烧器偏转前后的锅炉燃烧进行数值模拟,对比分析了燃烧器角度偏转前后的温度场、速度场、浓度场以及颗粒轨迹的变化,并将方案进行了工程应用。数值模拟和工程应用结果表明:燃烧器角度偏转后,炉内气流向炉膛中心集中,贴近侧墙的煤粉颗粒减少,对侧墙冲刷磨损减弱;同时,侧墙附近区域炉温下降,还原性气氛降低,高温腐蚀风险下降,锅炉燃烧效率基本持平。研究结果可为同类型锅炉高温腐蚀及水冷壁磨损防治提供借鉴。To effectively alleviate the high-temperature corrosion of the water-cooled walls on both sides of the opposed wall combustion of a 660 MW unit’s boiler and the erosion caused by coal particle impingement,a solution was proposed to deflect the swirl burners near the side walls by 3.5°towards the center of the furnace.This solution was based on an understanding of the causes and mechanisms of high-temperature corrosion and considering the on-site equipment conditions.Numerical simulations were conducted to analyze the combustion in the boiler before and after the burner deflection.A comparative analysis was performed on the changes in temperature distribution,velocity field,concentration field,and particle trajectories resulting from the burner angle deflection.The proposed solution was also implemented in practical engineering.The results of the numerical simulations and engineering application demonstrated that after deflecting the burner angles,the airflow inside the furnace concentrated towards the center,resulting in a reduction of coal particle impingement near the side walls and mitigating erosion.Additionally,the temperature near the side walls decreased,leading to a decrease in reducing atmosphere and a reduced risk of high-temperature corrosion.The combustion efficiency of the boiler remained unaffected.The findings of this study can serve as a reference for preventing and managing high-temperature corrosion and water-cooled wall erosion in boilers of similar types.

关 键 词：燃烧器偏转 高温腐蚀 颗粒冲刷 对冲燃烧锅炉 

分 类 号：TM621.2[电气工程—电力系统及自动化]