温度极化对膜蒸馏性能的影响研究进展

doi:10.19965/j.cnki.iwt.2020-0772

摘要/Abstract

摘要：

温度极化现象普遍存在于膜蒸馏过程中，该现象可导致驱动力下降、渗透通量降低且能耗增加。介绍了温度极化现象产生的原因及其评价指标，分析了进料液流速和膜的特性对其造成的影响，阐述了其在传热和传质过程中的负面作用。对传统膜蒸馏工艺及组件进行优化可在一定程度上减轻温度极化，但研发具有导热功能的复合膜以实现对冷进料的加热，则有望从根源上显著降低温度极化，提升膜蒸馏性能。

关键词: 膜蒸馏, 温度极化, 蒸汽压, 复合膜, 渗透通量

Abstract:

Temperature polarization is common in the membrane distillation process, which can lead to decrease of driving force and permeation flux, and an increase in energy consumption. The generation of temperature polarization and its evaluation indicators were introduced and the influence of the feed flow state and membrane characteristics on temperature polarization were analyzed. Its negative effects in the heat and mass transfer process were illustrated. Optimizing the traditional membrane distillation process and components could reduce temperature polarization to a certain extent, but the development of a thermally conductive composite membrane to achieve heating of the cold feed was expected to radically reduce temperature polarization and improve membrane distillation performance.

Key words: membrane distillation, temperature polarization, vapor pressure, composite membrane, permeation flux

中图分类号:

X703
TQ028.8

韩非,王康,汪凯,张翠玲. 温度极化对膜蒸馏性能的影响研究进展[J]. 工业水处理, 2021, 41(9): 31-36.

Fei Han,Kang Wang,Kai Wang,Cuiling Zhang. Research progress on the effect of temperature polarization on membrane distillation performance[J]. Industrial Water Treatment, 2021, 41(9): 31-36.

https://www.iwt.cn/CN/Y2021/V41/I9/31

图/表 4

图1 DCMD中的温度极化现象示意图

Fig.1 Temperature polarization phenomenon in DCMD

图2 流速分布与TPC的关系

Fig.2 The relationship between flow velocity distribution and TPC

图3 不同传质系数与流速下TPC的变化

Fig.3 Changes of TPC under different mass transfer coefficients and flow velocities

图4 利用膜表面加热冷进料示意图

Fig.4 Schematic diagram of using the membrane surface to heat the feed

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