分层填料错流旋转床吸收甲醇气体的传质性能  

Mass transfer performance of methanol absorption in layered packing cross-flow rotating beds

作　　者：杜杰[1] 袁志国[1] 梁鹏飞[1] 段珊珊 李航天 Jie DU;Zhiguo YUAN;Pengfei LIANG;Shanshan DUAN;Hangtian LI(Shanxi Province Key Laboratory of Higee-oriented Chemical Engineering,North University of China,Research Center of Shanxi Province for High Gravity Chemical Engineering and Technology,Taiyuan,Shanxi 030051,China)

机构地区：[1]中北大学超重力化工过程山西省重点实验室山西省超重力化工工程技术研究中心

出　　处：《过程工程学报》2018年第5期965-971,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:21376229);国家重点研发计划资助项目(编号:2016YFC0204103);山西省科技攻关项目(编号:2015031019-5)

摘　　要：在分层填料错流旋转床中用水吸收挥发性有机物甲醇气体,研究了超重力因子（β）、空床气速（u）、液体喷淋密度（q）和甲醇气体进口浓度等操作参数对甲醇气相总体积传质系数KGa的影响.结果表明,甲醇气体的KGa值随β,u和q增加而增加,随甲醇气体进口浓度增大变化较小.在β=100, u=0.9 m/s, q=17.6 m^3/（m2×h）和甲醇气体进口浓度14000 mg/m^3时,甲醇气体的吸收率为97%,KGa达27 s^-1以上,是挡板填料逆流旋转床的1.1-3.9倍,是挡板填料错流旋转床的2-7.7倍,表明分层填料错流旋转床可有效减小气膜控制为主的传质阻力.当甲醇气体入口浓度稳定时,在u大、q小的情况下,β对甲醇气体的KGa影响较大,有效强化了吸收甲醇过程中的传质效率.分层填料错流旋转床中u达1 m/s,是挡板填料错流旋转床中的3-12倍.The methanol was adsorpted by water via the layered packing cross-flow rotating bed. The effects of operating parameters such as high gravitational factor（β）, empty bed gas velocity（u）, liquid spray density（q） and inlet methanol concentration on the overall volumetric gas-phase transfer coefficient（KGa） of methanol were explored. The results indicated that KGa increased with the increases of β, u and q, but the inlet methanol concentrations had a negligible effect on the KGa of methanol. Under the conditions of β=100, u=0.9 m/s, q=17.6 m^3/（m2×h）, the inlet concentration of methanol was 14 000 mg/m^3, the absorptivity of methanol on rate was 97%, the KGa values of methanol reached 27 s-1, which was 1.1-3.9 times of the countercurrent-flow rotating packed bed with blade packing, 2-7.7 times of the cross-flow rotating packed bed with blade packing. It showed that the device can effectively reduce the mass transfer resistance of gas film control. When the inlet concentration of methanol gas was stable, high u and low q, β value had great influence on the KGa of methanol. The mass transfer efficiency in the process of methanol absorption was effectively enhanced. The empty bed gas velocity of this equipment reached 1 m/s, which was 3-12 times of the countercurrent-flow rotating packed bed with blade packing.

关 键 词：超重力 分层填料旋转床 吸收 传质 甲醇 

分 类 号：TF821[冶金工程—有色金属冶金]