Abstract: The type selection of oxidation fan for limestone-gypsum wet desulfurization process is determined in the design. The oxidation air system of some units cannot automatically adjust the air volume,which causes an increase in power consumption of the oxidation air system. As for coal-fired power plants with large changes in sulfur content of coal, a set of centralized control system for desulfurization and oxidation air system for "two boilers and two towers" is designed. Through online detection of the calcium sulfite concentration in slurry inside the absorption tower, the oxidation air volume is automatically adjusted, which reduces the power consumption of oxidation air system and achieves the purpose of energy conservation and consumption reduction.