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Enhanced performance of membrane distillation using radio-frequency induction heated thermally conducting feed spacers

机译：使用射频感应加热的导热馈电垫片增强了膜蒸馏的性能

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摘要

In the last decade, there is a growing interest in membrane distillation (MD) technology for treating hypersaline water and wastewater. However, MD commercialization is still limited by technical challenges such as temperature polarization, high energy required for heating the bulk feed solution, and heat losses. We demonstrate a proof-of-concept approach to overcome these limitations using stainless steel thermally conducing feed spacers. Feed spacers were directly heated by induction heating, a contactless and instant heating method, using radio frequency (RF) altering electromagnetic fields. Results show that heat was efficiently transferred to the water-membrane interface by conduction and advection, thus, eliminating the need to continuously heat the bulk feed solution. Furthermore, the RF heated spacers were shown (experimentally and by numerical simulations) to reduce temperature polarization. The influence of operating conditions (i.e., flow velocity, vacuum pressure, and power) and the spacer's material and geometry were evaluated and results were compared to a conventional MD process using a polymeric spacer. Overall, results show that higher spacer mass and larger porosity led to an increase in distillate flux and that the use of thermally conducing spacers heated by RF significantly enhance the distillate flux while reducing the specific heating energy.
机译：在过去的十年中，对治疗过氧碱水和废水的膜蒸馏（MD）技术越来越感兴趣。然而，MD商业化仍然受到温度极化等技术挑战的限制，加热散装馈送溶液的高能量，以及热损失。我们展示了一种概念证据方法，克服了不锈钢热敏饲料垫片的这些限制。使用射频（RF）改变电磁场，通过感应加热，非接触式加热方法直接加热进料垫片。结果表明，通过传导和平流将热量有效地转移到水膜界面上，因此消除了连续加热散装液的需要。此外，RF加热间隔物被示出（实验和通过数值模拟）以降低温度极化。评价操作条件（即，流速，真空压力和功率）和间隔物的材料和几何形状的影响，并将结果与​​使用聚合物间隔物的常规MD工艺进行比较。总体而言，结果表明，较高的间隔物质量和较大的孔隙率导致馏出物磁通量的增加，并且使用RF加热的热调节间隔物显着增强馏分焊剂，同时降低特定的加热能量。

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