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In Japan, pulverized-coal-fired thermal power plant boilers are operated with a high two-stage combustion ratio to reduce NOx emissions. This combustion ratio forms a strongly reducing atmosphere containing H2S at the burner zone. Water-wall tube materials, such as low-alloy steel, sulfidize severely in such an atmosphere. In the past few years, wastage of the tubes observed in limited areas. However,...
Severe sulfidation problems of water-wall tubes made from low-alloy steels for pulverized coal-fired boilers have been often recognized recently, due to the evolution to a strongly reducing atmosphere, which contains H2S, SO2. In an actual operating boiler, gas composition is not constant; it fluctuates between oxidizing and sulfidizing (reducing) atmospheres. There is still much uncertainty about...
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