【作者】 高振；

【导师】 马友光；

【作者基本信息】 天津大学 ， 化学工程， 2004， 硕士

【摘要】 有关膜蒸馏技术在海水淡化方面应用的实验研究已有大量的文献报道。本文针对真空膜蒸馏过程，在前人的研究基础上，对传递机理进行了进一步的理论研究，为真空膜蒸馏技术的应用提供了新的理论基础。从微观传递机理出发建立了真空膜蒸馏管内传质传热模型，使用正交配点法对中空纤维膜真空膜蒸馏过程中管内的温度、浓度分布进行了计算。利用文献中的实验结果对该模型所得的模拟结果进行了验证，取得了良好的一致性。同时,用该模型计算得到了管内微观温度、浓度分布，并对膜管内的微观传递机理进行了分析。此外,用该模型对真空膜蒸馏的影响因素进行了模拟分析，所得结果和文献实验结果相一致。用该模型对VMD过程进行了模拟分析研究，得到了关于VMD过程膜长度、膜厚度、膜内径以及与膜材料相关的参数等因素对过程的影响规律，并分析了在VMD过程中可能会产生负通量的原因，为海水淡化制膜研究提供了具有指导意义的理论依据。同时，对VMD过程传质和传热的变化规律进行了模拟分析，揭示了过程的主要控制因素，为进一步提高传递通量进行了有益的理论探索。更多还原

【Abstract】 A great of experimental investigations in membrane distillation have been reported in literature in the field of seawater desalination. In this paper, further theory study on the vacuum membrane distillation (VMD) is developed, which provides a new theoretical foundation for the application of vacuum membrane distillation technique.A new mass and heat transfer model for the hollow fiber VMD process is proposed, orthogonal collocation method is used to calculate the temperature and concentration distribution inside the tube of the hollow fiber membrane. Simulation results are at good agreement with the experimental data obtained by other researchers. The distribution of temperature and concentration inside the tube are also obtained at the same time. The impact factors of VMD are simulated and analyzed using the present model. Furthermore, process simulation is accomplished. The influences of length 、thickness 、inner radius and membrane configurational number on the VMD are discussed. The reason of negative flux in VMD is also analyzed. Some suggestions are given for the membrane production. The main controlling factor of VMD process is discussed through the simulation of the variation regulation of the mass and heat transfer. A useful theoretical exploitation is implemented to enhance the permeation flux of VMD process.更多还原