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Use of multiple extractions and injections to thermodynamically balance the humidification dehumidification desalination system

机译:使用多次萃取和注入来热力学平衡加湿除湿脱盐系统

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Humidification dehumidification(HDH)desalination systems are well suited for small scale, off-grid desalination. These systems are very robust and can tolerate a wide range of feed salinities, making them a good candidate for treating produced water from hydraulically fractured natural gas wells. A primary engineering challenge for these systems is their high thermal energy consumption. In this study, we examine the use of multiple air extractions and injections to thermodynamically balance the HDH system, so as to make it more energy efficient. The effect of the number of extractions on several performance parameters is studied. In addition, we study the effect of the enthalpy pinch, which is a measure of performance for a heat and mass exchanger, on these performance parameters. Finally, we present results that can be used as guidelines in designing HDH systems. These results include the identification of appropriate temperatures for the extracted/injected air streams, the division of the heat duty between stages, and the value of the mass flow rate ratio in each stage at various values of enthalpy pinch.
机译:加湿除湿(HDH)脱盐系统非常适合于小型,离网脱盐。这些系统非常坚固,可以耐受多种盐度,使其成为处理水力压裂天然气井采出水的理想选择。这些系统的主要工程挑战是其高热能消耗。在这项研究中,我们研究了使用多次抽气和喷射来热力学平衡HDH系统,从而使其更加节能。研究了提取次数对几个性能参数的影响。此外,我们研究了热缩夹层对这些性能参数的影响,该热缩夹层是热量和质量交换器的性能指标。最后,我们介绍了可作为设计HDH系统指南的结果。这些结果包括确定所提取/注入的空气流的合适温度,各阶段之间的热负荷分配,以及各个阶段的焓夹取值下的质量流量比值。

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