填料定子对分层填料错流超重力装置强化气膜控制传质过程的研究

Effect of stating packing on intensification of gas-film controlled mass transfer process in Layered Packing Cross-flow High Gravity Device

以化学吸收体系CO_2-NaOH测定分层填料错流旋转填料床中不同超重力因子β、空床气速u、喷淋密度q等条件下的有效传质比表面积a_e,采用气膜控制体系—NaOH溶液吸收气体中的SO_2测定气相体积传质系数k_ya_e,从而得到气相传质系数k_y。研究了β、u、q对k_ya_e、k_y、a_e的影响规律,对比了有无填料定子时分层填料错流旋转填料床的传质性能,从而验证了填料定子对分层填料错流超重力装置气相传质的强化作用。研究结果表明,k_ya_e和a_e均随着β、u、q增大而增大;k_y随着u增大而增大,但是随着β、q增大,先增大后减小;有填料定子时,k_y增加显著,是无填料定子时的1.3~2倍,表明填料定子能够进一步有效地强化气膜控制传质过程,提高气相传质系数。

The effective interfacial area aewas determined by chemical absorption in the CO2-NaOH system under different high gravity factor β, empty bed gas velocity u and spray density q in Layered Packing Cross-flow High Gravity Device. The gas-film controlled system SO2-NaOH was used for characterizing gas volumetric mass transfer coefficient kyae, then the gas phase mass transfer coefficient kywas obtained. The effect of β, u, q on kyae, ky, ae was investigated. The mass transfer performance was studied with stating packing or without stating packing in Layered Packing Cross-flow High Gravity Device, so that the stating packing on intensification of gas-film controlled mass transfer process was verified. The experimental results showed that both kyae and ae increased with the increase of β, u and q. ky increased with the increase of u. However, increasing β or q, ky increased first then decreased. Installing stating packing significantly increased ky by 1.3-2 times, which indicated that the installation of stating packing can effectively intensify the gas-film controlled mass transfer process and enhance gas phase mass transfer coefficient.