Simulation analysis of boiler high temperature corrosion atmosphere under lean oxygen operation

Abstract

High-temperature corrosion is a major threat to the safe operation of thermal power plants. The reducing atmosphere induced by boiler lean oxygen combustion has close relation with the water walls corrosion. In this paper, the reducing atmosphere such as CO, H2S concentration distribution was simulated targeted on a boiler. Under the full load, the atmosphere and the temperature distribution in low nitrogen combustion mode were further studied on different excess air ratios and the rates and position of the SOFA air conditions. With the SOFA rate increasing, the flame centre moved up, the boiler temperature is more uniform, and the temperature at the furnace outlet increased. the concentration of CO and H2S in the main combustion zone is obviously increased. In the burnout zone, there is almost no CO and H2S due to the supplement of SOFA.