Ultra-low emission transformation can effectively reduce pollutant emissions from coal-fired power plants

but some transformation for the desulfurization system exposed a series of problems such as too large design margin

excessive retrofitting and over high energy consumption. To solve these problems

this paper suggests that reasonable design boundary condition should be ascertained

and optimal sulfur content in the design coal should be selected according to the actual fuel. The design scheme should be optimized and energy conservation equipment should be selected. The design plan should take into account the flexible regulation of the desulfurization system and energy saving operation under different load conditions. The operation parameters should also be adjusted. The result can provide references for the similar engineering designs.