This paper presents a new type of circulation system combining heat pump and liquid gap membrane distillation (LGMD) for the concentration of sulfuric acid solution. The proposed hybrid system not only has a simpler flow configuration, but it also demonstrates significant thermal performance advantages. Based on the principle of conservation of mass and energy, a mathematical model is established in Aspen Plus to simulate working conditions. Through varying the relevant parameters, the solution with low boiling point elevation to achieve the maximum water production gain to output ratio (GOR) value was obtained, which is approximately 33 times that of the conventional system under the given condition in this research. Given the temperature difference between the condenser and the evaporator in the heat pump cycle, the higher membrane flux and the maximal value of GOR are obtained at the high feed temperature. However, increasing the molar fraction of the feed solution sharply decreases both the membrane flux and GOR, especially at high feed solution temperatures. Additionally, it was found that the high GOR are obtained when selecting the high boiling point working fluids. Therefore, these results can provide significant references for the further implementation and optimization of the proposed system.

本文介绍了一种结合热泵和液隙膜蒸馏（LGMD）的新型硫酸溶液浓缩循环系统。所提出的混合系统不仅具有更简单的流动配置，而且还展示了显着的热性能优势。基于质量和能量守恒原理，在 Aspen Plus 中建立数学模型来模拟工况。通过改变相关参数，得到了低沸点升高的解决方案，以实现最大的产水增产比（GOR）值，约为本研究给定条件下常规系统的33倍。鉴于热泵循环中冷凝器和蒸发器之间的温差，在高进料温度下获得更高的膜通量和GOR最大值。然而，增加进料溶液的摩尔分数会急剧降低膜通量和 GOR，尤其是在高进料溶液温度下。Additionally, it was found that the high GOR are obtained when selecting the high boiling point working fluids. 因此，这些结果可为所提出系统的进一步实施和优化提供重要参考。