金属套管式微通道气液传质特性研究  

Gas-liquid mass transfer performance in a metal tube-in-tube microchannel

作　　者：周月[1] 潘美园[1] 陈桂子[1] 王洁欣[1] 

机构地区：[1]北京化工大学化学工程学院有机无机复合材料国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2013年第3期12-16,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金(21176013)

摘　　要：以纯水吸收CO2的物理吸收过程,研究了金属套管式微通道的气液传质特性。考察了气液两相的接触方式、气体和液体表观线速度、微通道结构尺寸(如微孔孔径、套管环隙尺寸)等对液侧体积传质系数的影响规律。结果表明,气相走内管、液相走外管,更有利于实现良好的气液传质效果;液侧体积传质系数随气液表观线速度的增加而增加,但液相表观线速度的影响更显著;微孔孔径和套管环隙尺寸的减小能显著提高液侧体积传质系数,但套管环隙尺寸的影响更大。A metal tube-in-tube microchannel（MTMC） with a high throughput was developed based on a typical T-junction microchannel.In the MTMC,two coaxial stainless steel tubes formed an annular microchannel,and a micropore section on the annular surface of one end of the inner tube was employed as the dispersion medium.The physical absorption process of CO2 in water in the MTMC was investigated.The effects of varying the gas-liquid contact method,superficial gas and liquid velocities,and structural parameters of the MTMC（including micropore size and annular size） on the liquid side volumetric mass transfer coefficient were explored.The experimental results indicated that the flow of gas in the inner tube and liquid in the outer tube was beneficial to mass transfer.The liquid side volumetric mass transfer coefficient increased with the increase of superficial gas and liquid velocities,with the superficial liquid velocity having a greater effect.In addition,decreasing the micropore size or annular size both increase the mass transfer coefficient;however,annular size has a more obvious effect.

关 键 词：套管式微通道 二氧化碳 气液传质 液侧体积传质系数 

分 类 号：TQ021.4[化学工程]