Presumptive Study of Temperature and Residual Strength of Desulfurization Tower Structure During and after Fire

Currently, the presumption of temperature and residual strength of structural components of desulfurization tower during and after fire has become one of the key difficulties in the analysis of structural safety of desulfurization tower. Taking the actual situation of a steel desulfurization tower after fire as the background, this study proposes a method to presume the maximum temperature of the structural members of desulfurization tower in fire and a method to presume the fire temperature of the residual strength of steel in desulfurization tower after fire. The results show that: in the fire, the maximum temperature of the sulfur tower structural components in the chimney area, the wet electric area and the mist removal area over the fire is greater than 700 ℃, and the lower part of the slurry area over the fire temperature is about 200 ℃. After the fire, the desulfurization tower anticorrosive materials burned out, the wall plate material strength has been reduced, and the chimney zone root safety reserve is low. Considering the phenomenon of “blue brittle” after high-temperature fire of steel, that is, the steel toughness is reduced, the chimney area and the combination of wet power area have the lowest safety reserve. Provide scientific basis for evaluating the safety appraisal of desulfurization tower structure after fire.