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为研究中空纤维膜和吸湿溶液结合进行制冷预除湿过程的传质机理,建立了膜管外湿空气中的水蒸气通过膜孔最后被溴化锂溶液吸收传质过程的数值模型,研究了液体进口流速、进口质量分数和进口温度对管内溶液的温度分布、质量分数分布、膜孔内水蒸气质量分数分布和膜管外水蒸气质量分数分布的影响,并比较了这三种因素对传质的影响程度。在一般预除湿用疏水性膜组件的内部溶液压力条件下(小于10kPa),溶液与水蒸气的接触面在疏水性膜内壁表面。溶液流速的增大、溶液进口质量分数的增大以及溶液进口温度的降低均有利于传质进行,其中,提高溶液进口质量分数对加强传质最为有效。
In order to study the mass transfer mechanism of the combination of hollow fiber membrane and hygroscopic solution for pre-dehumidification process, a numerical model was established for the water vapor in the moist air outside the membrane tube to pass through the membrane pore and be absorbed by lithium bromide solution. The effects of liquid inlet velocity , The influence of inlet mass fraction and inlet temperature on the temperature distribution, mass fraction distribution, water vapor mass fraction in membrane pores and water vapor mass fraction distribution outside of membrane tube, and the effects of these three factors on mass transfer were compared degree. Under the condition of internal solution pressure (less than 10kPa) of the hydrophobic membrane module for general pre-dehumidification, the contact surface between the solution and water vapor is on the surface of the hydrophobic membrane inner wall. Increasing the flow rate of the solution, increasing the mass fraction of the solution inlet and decreasing the inlet temperature of the solution are conducive to mass transfer, wherein increasing the mass fraction of the solution inlet is most effective for enhancing mass transfer.