Abstract: The absorption of SO2 in flue gas with sodium hydroxide solution in a novel rotating packed bed was studied. The effects of high gravity factor, ratio of liquid to gas and gas flow rate on removal rate of SO2 (h) and mass transfer coefficient (KGa) were examined experimentally. Besides, the effect of number of cycles on h and pH of absorbing solution under the condition of circulation absorption was also studied. The results showed that h increased with the increase of high gravity factor, ratio of liquid to gas, but decreased with the increase of gas flow rate, and KGa increased with the increase of high gravity factor, ratio of liquid to gas and gas flow rate. Under the condition of circulation absorption, h and pH value of absorbing solution decreased with the increase of number of cycles. The optimum experimental conditions were obtained as high gravity factor of 67, gas flow rate of 55 m3/h, and ratio of liquid to gas of 1.1~1.3 L/m3. Under the optimized conditions, SO2 concentration of exit gas was reduced to below 100 mg/m3, and h reached around 98.7%. The removal rate of SO2 in the novel RPB was 18.7% higher compared with that of a multi-stage-spraying rotating packed bed. Based on the experimental data, the empirical formula of KGa was expressed as .

Key words: rotating packed bed, sulfur dioxide, absorption, mass transfer

摘要： 在新型旋转填料床中以NaOH为吸收液脱除烟气中的SO2，考察了超重力因子、液气体积比、进气量等因素对脱硫率(h)和气相传质系数(KGa)的影响及循环次数对脱硫率和溶液pH值的影响. 结果表明，h随超重力因子、液气体积比增加而增加，随进气量增加而降低；KGa随超重力因子、液气体积比、进气量增加而增加. 脱硫率和溶液pH值随循环次数增加呈下降趋势. 最佳操作条件为：超重力因子67，进气量55 m3/h，液气体积比(1.1~1.3)′10-3. 在该条件下，出口气体中SO2浓度低于100 mg/m3，h稳定在约98.7%，比多级雾化旋转填料床提高18.7%. 对实验数据进行回归，拟合出KGa与气相雷诺数ReG、液相韦伯数WeL和伽利略数Ga之间的关联式为

关键词: 旋转填料床, 二氧化硫, 吸收, 传质