防止高卤素危废焚烧余热锅炉高温腐蚀的措施

Measures to Prevent High Temperature Corrosion of Waste Heat Boiler for Incineration of High Halogen Hazardous Waste

为了解决高卤素危废焚烧产生的高温烟气对余热锅炉水冷壁的腐蚀,深入研究了高温腐蚀机理、熔敷技术,发现积灰中氯含量越高,高温腐蚀越严重,含氯量大于5%时,腐蚀程度快速增加。腐蚀速度与壁温成正比,且烟温越高,腐蚀速度随壁温上升越剧烈。当烟气中S/Cl≥4时,可以有效抑制高温腐蚀。危废入炉时做好配伍保持高S/Cl,烟气温度高于650℃时,水冷壁区域采用HR-160合金进行熔敷的措施,可以解决高卤素危废高温腐蚀问题,保证余热锅炉长周期运行。

In order to solve the corrosion of high temperature flue gas from incineration of high halogen hazardous waste on the water wall of waste heat boiler,the high temperature corrosion mechanism and cladding technology were studied deeply. It was found that the higher the chlorine content in the ash was,the more serious the corrosion was at high temperature,and when the chlorine content was more than 5%,the corrosion degree increased rapidly. The corrosion rate was proportional to the wall temperature,and the higher the smoke temperature was,the more severe the corrosion rate increased with the rise of the wall temperature. When S/Cl in flue gas was≥4,high temperature corrosion could be effectively inhibited. The high temperature corrosion problem of high halogen hazardous waste could be solved and could ensure long period operation of waste heat boiler by keeping high S/Cl compatibility,adopting HR-160 alloy for cladding in the water wall area when the flue gas temperature was higher than 650 ℃.