Abstract
This paper introduced the principle of inner-furnace desulfurization system of CFB boilers by injecting limestone, and investigated the factors of the desulfurization efficiency. The desulfurization efficiency and stability of 480t/h CFB boilers manufactured by DongFang Boiler (Group) Co., Ltd were greatly increased by retrofitting the limestone injection position from dense region to the down secondary-air inlet of the back-wall. The improvement was achieved by increasing the oxygen concentration as well as optimizing the temperature of the reaction zone.
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