膜科学与技术

管式气隙膜蒸馏组件结构设计及性能研究

作者：纪仲光，李伟，王海霞

单位：有研科技集团有限公司生物冶金国家工程实验室北京 101407；有研资源环境技术研究院(北京)有限公司，北京 101407；北京有色金属研究总院，北京 100088；有研工程技术研究院有限公司，北京 101407

关键词：膜蒸馏；传质；通量；膜污染；润湿性

出版年,卷(期):页码： 2021,41(2):88-95

摘要：

膜通量低和膜污染严重是目前制约膜蒸馏技术走向大规模工业化利用的主要原因之一，本文首先以气隙式膜蒸馏为模型，对传质过程的中间气隙层、冷凝管材质及表面积、料液进出口方式等进行研究，提出了一种新型的管式膜蒸馏——膜接触式膜蒸馏（M-DCMD）；然后配制了1 moL·L-1 的KCl作为模拟料液进行膜接触式（M-DCMD）、气隙式（AGMD）、直接接触式（DCMD）膜蒸馏的浓缩循环过程、膜污染以及膜润湿情况的对比研究。研究结果表明：在65 ℃的操作条件下，消除气隙层使膜通量增加了59.8%；不锈钢冷凝管（导热系数17 W·m-1·K-1）和铜质冷凝管（导热系数386.4 W·m-1·K-1时）相比PVC冷凝管，其膜蒸馏通量分别增加了55%和56%，即膜通量受冷凝管材料的影响显著；冷凝表面积与膜有效工作面积比例从1:1.77增加至1:1.24时，膜通量提升了34.3%；在同等条件下脱盐处理时，M-DCMD式的抗污染性、抗润湿性的综合性能显著优于AGMD及DCMD。

Low membrane flux and serious membrane fouling are one of the main reasons that restrict membrane distillation technology to large-scale industrial utilization, the air gap membrane distillation is used as a model to study the mass transfer, which the intermediate air gap layer, condensing tube material, condensation surface area, and liquid inlet and outlet pattern are included in. Then, A new type of tubular membrane distillation was proposed and called as membrane contact membrane distillation (M-DCMD). After that, Potassium chloride solution(1 moL·L-1) was concentrated by membrane contact type(M-DCMD), air gap type(AGMD), direct contact type(DCMD) for comparative study theirs concentration process, membrane fouling and membrane wetting. The results show that the membrane flux increased by 59.8% at 65 ℃ by eliminating the air gap layer. stainless steel condenser tube. The membrane flux of stainless steel condenser tube and copper condenser tube increased by 55% and 56% respectively, compared with PVC condenser tube. Therefore, the membrane flux is significantly affected by the material of the condenser tube. When the ratio of condensation surface area to membrane effective working area increased from 1:1.77 to 1:1.24, the flux of membrane distillation increased by 34.3%. When desalting under the same conditions, the comprehensive properties of M-DCMD such as anti-pollution and anti-wetting are significantly better than AGMD and DCMD.

纪仲光（1982—）,男，河北遵化人，博士，高级工程师，研究方向：膜及膜分离技术在水处理领域应用, E-mail：jizhongguang@grinm.com

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