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采用气膜控制体系—NaOH溶液吸收气体中SO_2,研究了超重力因子β、空床气速u、喷淋密度q等操作条件对装置的气相体积传质系数kyae的影响和强化效果,验证了分层填料错流超重力装置对气相传质的强化效果,优化了结构,以提高传质效率.结果表明,kyae随β,u和q增加而增加.在β=55,u=1.53 m/s,q=3 m3/(m2·h)时,kyae可达28 s-1以上,是喷淋塔的10~75倍,单层错流旋转床的1.4~2.2倍,比分裂填料旋转床操作条件温和、设备结构简单、能耗更低.本超重力装置能有效强化气膜控制传质过程.
The gas membrane control system-NaOH solution was used to absorb the SO 2 in the gas. The effects of the super-gravity factor β, the velocity of the empty bed velocity u, the spray density q on the gas phase volumetric mass transfer coefficient kyae and the strengthening effect were studied. The results show that kyae increases with the increase of β, u and q. At β = 55, u = 1.53 m / kyae can reach over 28 s-1, which is 10-75 times higher than that of the spray tower and 1.4-2.2 times that of a single-layer cross-flow rotating bed, which is higher than that of the split-bed rotating bed The operating conditions are mild, the equipment structure is simple, and the energy consumption is lower. The super gravity device can effectively strengthen the gas membrane mass transfer control process.