Study on High Temperature Corrosion of Water Wall of Opposed Boiler Burning High Sulfur Coal
The high temperature corrosion problem of the water wall of HG1021/18.2-YM3 subcritical natural circulation boiler designed and manufactured by Harbin Boiler Plant of a power plant was studied.During the maintenance,it was found that there was a relatively prominent corrosion problem in the water wall,and the modification scheme of wind direction adjustment and imaginary tangent diameter was proposed to solve the problem,and the improvement effect of the high temperature corrosion problem of the water wall after the modification was under-stood.The analysis shows that it is related to the air staged combustion technology after the low nitrogen transformation and the large diameter of the tangential burner at four corners;through the observation of the velocity field,temperature field,CO concentration field,O2 concentra-tion field and H2S concentration field in the furnace after the transformation,it is confirmed that the transformation scheme can change the problem of flame erosion,reduce the high-temperature area,improve the oxidizing atmosphere,and adjust the H2S concentration in the fur-nace.Finally,through the actual engineering verification,the modified scheme can effectively change the high temperature corrosion problem in the key areas of the water wall.
burning high sulfur coalboiler water wallhigh temperature corrosion
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