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Experimental Evaluation of the Thermal Polarization in Direct Contact Membrane Distillation Using Electrospun Nanofiber Membranes Doped With Molecular Probes

机译:使用分子探针掺杂的电纺纳米纤维膜在直接接触膜蒸馏中热极化的实验评估

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摘要

Membrane distillation (MD) has recently gained considerable attention as a valid process for the production of fresh-water due to its ability to exploit low grade waste heat for operation and to ensure a nearly feed concentration-independent production of high-purity distillate. Limitations have been related to polarization phenomena negatively affecting the thermal efficiency of the process and, as a consequence, its productivity. Several theoretical models have been developed to predict the impact of the operating conditions of the process on the thermal polarization, but there is a lack of experimental validation. In this study, electrospun nanofiber membranes (ENMs) made of Poly(vinylidene fluoride) (PVDF) and doped with (1, 10-phenanthroline) ruthenium (II) Ru(phen)3 were tested at different operating conditions (i.e., temperature and velocity of the feed) in direct contact membrane distillation (DCMD). The temperature sensitive luminophore, Ru(phen)3, allowed the on-line and non-invasive mapping of the temperature at the membrane surface during the process and the experimental evaluation of the effect of the temperature and velocity of the feed on the thermal polarization.
机译:膜蒸馏(MD)作为一种有效的淡水生产方法最近受到了广泛的关注,因为它能够利用低品位废热进行操作并确保几乎不依赖于进料浓度的高纯度馏出物的生产。局限性与极化现象有关,该现象对工艺的热效率产生负面影响,并因此影响其生产率。已经开发了几种理论模型来预测过程的操作条件对热极化的影响,但是缺乏实验验证。在这项研究中,由聚偏氟乙烯(PVDF)制成并掺杂有(1,10-菲咯啉)钌(II)Ru(phen)3的电纺纳米纤维膜(ENM)在不同的操作条件下(即温度和直接接触膜蒸馏(DCMD)中的进料速度)。温度敏感的发光体Ru(phen)3可以在线和非侵入性地绘制过程中膜表面的温度,并且可以通过实验评估进料的温度和速度对热极化的影响。

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