This paper proposed a vacuum membrane distillation system coupled with heat pump (VMD-HP) for the treatment of sulfuric acid solution, in which the evaporator was employed to cool secondary vapor from the VMD process while the condenser was used to heat feed sulfuric acid solution. Mathematical models were first established in view of mass and energy conservation principles, and then validated through a conventional VMD experimental system with polytetrafluoroethylene (PTFE) membrane material. Furthermore, the effects of operating parameters on system performance were investigated comprehensively. The results showed that the combined system could achieve the evaporation process with lower temperature of 318.15 K–333.15 K. Decreasing feed concentration or increasing feed temperature, feed velocity and permeate side pressure, was effective to reduce the specific heating energy consumption (SHEC) and elevate the performance coefficient (COP). Taking the treatment concentration of 20% for instance, feed temperature, feed flow rate and evaporation rate were fixed at 333.15 K, 2 t•h⁻¹and 1 t•h⁻¹, respectively. The SHEC and COP for the VMD-HP system were 181.47 kWh•t⁻¹ and 3.44, respectively. The specifics evaporation cost was found to be 15.56 $•t⁻¹, with a reduction amplitude of 58.74% than that of conventional VMD system.

本文提出了一种真空膜蒸馏结合热泵（VMD-HP）的硫酸溶液处理系统，其中蒸发器用于冷却VMD过程中的二次蒸汽，而冷凝器用于加热供给的硫酸溶液。 . 首先根据质量和能量守恒原理建立数学模型，然后通过聚四氟乙烯（PTFE）膜材料的常规VMD实验系统进行验证。此外，还全面研究了运行参数对系统性能的影响。结果表明，组合系统可以实现较低温度318.15 K-333.15 K的蒸发过程。降低进料浓度或提高进料温度、进料速度和渗透侧压力，SHEC）并提高性能系数（COP）。以20%的处理浓度为例，进料温度、进料流量和蒸发速率分别固定在333.15 K、2 t•h ^-1和1 t•h ^-1。VMD-HP 系统的SHEC和COP分别为 181.47 kWh•t ^-1和 3.44。发现具体蒸发成本为 15.56 $•t ^-1，比传统 VMD 系统的减少幅度为 58.74%。