关键词: 喷嘴角度, 循环流化床, 脱硫塔, 气-液-固三相流, 数值模拟

Abstract: The CFB-FGD process is a semi-dry flue gas desulfurization technology used at the end of the boiler. Considering multiple complex chemical reactions in the desulfurization tower，the mixing level of the gas-liquid-solid in the desulfurization tower would be one of the dominant factors of the reactions. Considering the high cost to build the desulfurization test bench，this paper presented a numerical simulation for flow field of desulfurization reactor using a pseudo-homogeneous fluid model in order to improve the flow field in the circulating fluidized bed desulfurization reactor with nonuniformity generated by its nozzle angle. The influencing mechanism of nozzle angle (?30°，0° and 30°) on the gas-liquid-solid flow field in the desulfurization tower was discussed. The results showed that at nozzle angle of ?30°，the nonuniformity of the flow field was reduced in the circulating fluidized bed the volume fraction distribution of the desulfurizer particles had better uniformity and the mixing of the gas-liquid-solid three phase was better，resulting in a better efficiency of desulphurization.

Key words: nozzle angle, circulating fluidized bed, desulfurization tower, gas-liquid-solid three phase flow, numerical simulation