中空纤维膜除湿器除湿过程对除湿效率的影响因素研究

Research on the Influencing Factors of Dehumidification Efficiency during the Dehumidification Process of Hollow Fiber Membrane Dehumidifiers

摘要: 在工业生产、低温生物医疗等领域中往往需要空气达到较低的相对湿度，因此需要对空气进行除湿处理。本文以PVDF膜构建单膜管中空纤维除湿器为研究对象，通过CFD (Computational Fluid Dy-namics)数值模拟的方法研究了中空纤维膜除湿器除湿过程中的一些参数对除湿效率的影响。通过分析得出在一定范围内增大湿空气进气流速可以提高除湿效率、增加吹扫气流速会使除湿效率下降，增大膜两侧湿空气和吹扫气的温差可以增强传热过程，提高除湿效率，最佳的孔隙率选取范围为60%~80%，入口处湿空气相对湿度应在合理范围内，过高的相对湿度容易引起湿工况导致除湿效率下降。

Abstract: In industrial production, low-temperature biomedical and other fields, it is often necessary to achieve lower relative humidity in the air, so dehumidification treatment is required. This article takes the construction of a single membrane tube hollow fiber dehumidifier using PVDF membrane as the research object and studies the influence of some parameters in the dehumidification pro-cess of the hollow fiber membrane dehumidifier on the dehumidification efficiency through CFD (Computational Fluid Dynamics) numerical simulation method. Through analysis, it is found that increasing the inlet flow rate of moist air within a certain range can improve dehumidification effi-ciency while increasing the flow rate of blowing air can lead to a decrease in dehumidification effi-ciency. Increasing the temperature difference between moist air on both sides of the membrane and blowing air can enhance heat transfer and improve dehumidification efficiency. The relative humidity of moist air at the inlet should be within a reasonable range, and the optimal porosity range is 60% to 80%. Excessive relative humidity can easily cause a decrease in dehumidification efficiency under wet conditions.