某中储式锅炉水冷壁高温腐蚀特征分析  

Analysis on High Temperature Corrosion Characteristics of Water Wall in Boiler with Storage Coal Pulverizing System

作　　者：熊小鹤[1] 丁鹏 谭厚章[1] 王承亮 李延森 XIONG Xiaohe;DING Peng;TAN Houzhang;WANG Chengliang;LI Yansen(MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Huadian Qingdao Power Generation Co.,Ltd.,Qingdao 266000,China;Huadian International Technical Service Branch,Jinan 250000,China;Xi’an Green Electric Power Technology Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049 [2]华电青岛发电有限公司,山东青岛266000 [3]华电国际技术服务分公司,山东济南250000 [4]西安格瑞电力科技有限公司,陕西西安710000

出　　处：《锅炉技术》2024年第6期12-19,共8页Boiler Technology

基　　金：国家重点研发计划项目(2023YFC3905700)。

摘　　要：对某中储式制粉系统锅炉的高温腐蚀特点进行了详细分析,包括腐蚀区域、煤粉刷墙情况、煤粉未燃尽情况以及运行人员的习惯运行方式等.研究发现:该锅炉腐蚀最严重区域位于三次风喷口下方,而不是燃尽风喷口下方,这是与直吹式制粉系统锅炉发生高温腐蚀的一个显著区别点.另外,该锅炉腐蚀还有一个特点是沿着一次风逆时针切圆方向,从上游到下游区域,腐蚀在水冷壁管出现的位置依次为向火侧腐蚀、管中间腐蚀、管两侧腐蚀.煤粉大面积刷墙和水冷壁区域的高H2S浓度是严重腐蚀的主要原因.在刷墙处抽烟气获得的未燃尽煤粉燃尽率73.5%~80%,煤粉经炉内高温后,黄铁矿硫基本分解完毕,剩余硫主要以有机硫为主.A detailed analysis was conducted on the high-temperature corrosion characteristics of a boiler with the storage pulverized-coal milling system,including the corrosion area,coal powder eroding water walls,coal powder unburnt conditions and the habitual operation mode of the operating personnel.Research has found that the most severely corroded area of the furnace is located below the tertiary air nozzles,rather than that below the SOFA nozzles,which is a significant difference from the high-temperature corrosion of the direct firing pulverizing system boiler.In addition,another corrosion characteristic in this furnace was found,that is,along the counterclockwise tangential direction of the primary air,from upstream to downstream areas,the locations where the corrosion occurs in the water-cooled wall tubes can be sorted into three categories,the fire-facing side of the tube,the middle area of the tube,and the backfire and fire-facing sides of the tube.The large unburnt coal powder eroding water wall and the high H 2S concentration are the main causes of severe corrosion.The burnout rate of unburned pulverized coal obtained by extracting flue gas adjacent to the water wall where the coal powders erode is 73.5%—80%.After the pulverized coal is heated in the furnace,the pyrite sulfur is basically decomposed,and the remaining sulfur is mainly organic sulfur.

关 键 词：中储式制粉系统 锅炉 高温腐蚀 火焰刷墙 H_(2)S 

分 类 号：TH39[机械工程—机械制造及自动化]