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首页> 外文期刊>Energy Conversion & Management >Joule heating membrane distillation enhancement with multi-level thermal concentration and heat recovery
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Joule heating membrane distillation enhancement with multi-level thermal concentration and heat recovery

机译：焦耳加热膜蒸馏增强，具有多级热浓度和热回收

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摘要

Self-heating membrane distillation process (MD) uses solar and electrical energy to directly heat a composite membrane for seawater desalination, has obvious advantages in terms of cost and energy consumption. However, there has been minimal research concerning the independent power supply for joule heating MD and desalination performance remains unsatisfactory. In this work, the thermal management measures of multi-level thermal concentration and multi-level heat recovery device were used in combination to improve the MD process. A tri-layer superhydrophobic composite membrane having good joule thermal conversion was prepared and its electrochemical impedance performance was analyzed. Joule heating MD experiments revealed that the multi-level thermal concentration could improve the MD performance, and reduce the membrane cost, due to the nonlinear relation of vapor transport and thermal concentration. The use of a multi-level heat recovery device further enhanced MD performance through recycling the energy from the condensing process. A highest freshwater obtained was approximately 2.77 kg m(-2)h(-1) with energy consumption 0.36 kW h kg(-1) and 99.9% salt removal. This highly efficient joule heating MD process could be combined with other MD processes to enhance freshwater productivity and reduce energy consumption, and could also lead to further development and applications of the MD process.
机译：自加热膜蒸馏工艺（MD）使用太阳能和电能直接加热复合膜进行海水淡化，在成本和能耗方面具有明显的优势。然而，关于焦耳加热MD和脱盐性能的独立电源存在最小的研究仍然不令人满意。在这项工作中，组合使用多级热浓度和多级热回收装置的热管理测量，以改善MD工艺。制备具有良好焦耳热转化的三层超疏水复合膜，分析了电化学阻抗性能。焦耳加热MD实验表明，由于蒸汽传输和热浓度的非线性关系，多级热浓度可以提高MD性能，降低膜成本。通过从冷凝过程中的能量回收能量，使用多级热回收装置的使用进一步增强了MD性能。获得的最高淡水约为2.77kg m（-2）h（-1），能量消耗0.36 kW h kg（-1）和99.9％的盐去除。这种高效的焦耳加热MD工艺可以与其他MD工艺组合，以提高淡水生产率并降低能耗，也可能导致MD过程的进一步发展和应用。

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