不同规整填料旋转床的传质性能对比

采用Na₂CO₃-H₂S为体系,利用规整丝网填料和新型塑料填料的错流旋转床为吸收设备,探究了两种填料床的传质性能,通过理论推导气液传质系数K_y和K_ya的表达式,考察了液量、气液比、超重力因子对脱硫率、K_y和K_ya的影响。实验结果表明:在相同条件下,规整丝网填料床的脱硫率略高于新型塑料填料床,约为3%～4%,但K_y、K_ya和压降分别是新型塑料填料床的0.25～0.5、0.8～0.9和0.3～0.5倍。通过文献对比分析,在相近工况条件下,新型塑料填料床的K_ya比散装丝网填料床提高了1.45倍。并对实验数据进行回归,拟合出K_y、K_ya与气相雷诺数Re_G、液相韦伯数We_L和伽利略数Ga之间的关联式。

Comparative study of mass transfer performance of different structured packings in rotating packed bed

Mass transfer performance of cross-current rotating packing bed with metallic wire structured packing and novel plastic structured packing respectively was investigated using Na₂CO₃- H₂S as absorption system. The effects of liquid flow,gas-liquid ratio,and high-gravity factor on desulfurization rate and gas phase mass transfer coefficient were studied by theoretical derivation of expressions of gas-liquid mass transfer coefficients K_y and K_ya. Desulfurization rate of wire packing bed was 3%-4% higher than novel plastic packing bed under the same conditions,but K_y,K_ya and pressure drop were 0.25-0.5、0.8-0.9 and 0.3-0.5 times of novel plastic packing bed. K_ya of novel plastic packing bed was 1.45 times higher than that of bulk wire packing bed under similar working condition. Correlation of K_y,K_ya and gas phase Reynolds numbers Re_G,liquid phase Weber number We_L,Galileo number Ga was obtained by regression of experiment data.