锅炉高温腐蚀在线监测技术的研究

Study on On-line Monitoring Technology for High Temperature Corrosion of Boilers

在试验室模拟某300 MW机组锅炉的高温腐蚀,对炉膛贴壁处烟气成分浓度和水冷壁高温腐蚀速率的相关性进行了试验研究.结果表明:在不同的气体配比下,高温腐蚀速率随CO浓度的提高呈抛物线增长;通过实时测量烟气中CO、O2、H2S和SO2等气体浓度,可实现炉膛高温腐蚀速率的在线监测.应用此研究结果在实炉中进行了热态试验,结果表明:在锅炉燃烧优化过程中,应监测炉膛水冷壁高温腐蚀速率,以确保机组安全.

High temperature corrosion of a 300 MW boiler was simulated in the laboratory.Experimental study was carried out on the correlation between components concentration of flue gas near the furnace wall and high temperature corrosion rate of waterwall.Results show that under different matched gases,high temperature corrosion rate increases with the concentration of CO in parabolic shape.On-line monitoring for high temperature corrosion rate can be realized by real time measuring for the gas concentration of CO,O_2,H_2S and SO_2 in the flue gas.This research result was applied in a hot test in the laboratory.Results show that in the process of boiler combustion optimization,high temperature corrosion rate of furnace waterwall should be monitored to ensure the safety of unit.