Abstract: In order to minimize the cost of desulfurization and denitrification while meeting the pollutant discharge standards and achieving economic operation, an in-service 300 MW CFB boiler pollutant control system is taken as the study object. Based on the study on the major factors that affect the desulfurization and denitrification results, a system model is established with the SO_x and NO_x emission concentration, the desulfurization and denitrification efficiency, and the major influencing factors as the constraints and the economic performance as the objective function. By solving the optimization model, an optimal solution is obtained which both satisfies the constraints and minimizes the raw material consumption and the electricity consumption. The method, which meets the new environmental standards and enables the system cost to be the lowest at the same time, provides new ideas for the energy saving of the CFB boiler pollutant removal system.

Key words: thermal power generation unit, multi-objective model, circulating fluidized bed boiler, desulfurization and denitrification