液隙式热泵膜蒸馏海水淡化系统的热力性能分析  

Thermal performance analysis of seawater desalination system based on liquid gap heat pump membrane distillation

作　　者：张绮钰 童乐 岳晨[1,2] Qiyu ZHANG;Le TONG;Chen YUE(School of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 210016,China;Key Laboratory of Thermal Management and Energy Utilization of Aircraft,Ministry of Industry and Information Technology,Nanjing,Jiangsu 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]航空飞行器热管理与能量利用工业和信息化部重点实验室,江苏南京210016

出　　处：《过程工程学报》2020年第11期1265-1272,共8页The Chinese Journal of Process Engineering

基　　金：江苏省自然科学基金(编号:BK20191276)。

摘　　要：热泵膜蒸馏是一种新型的膜分离技术,在处理高浓度盐水方面具有很大的优势,而目前的热泵膜蒸馏系统存在渗透量较低、冷却水消耗量大等问题。为提高渗透量、减少冷却水的消耗,设计了一种新型液隙式热泵膜蒸馏的海水淡化系统,通过在Aspen Plus中自定义膜模块建立经过实验验证的系统仿真模型,研究了进料液温度、渗透侧温度及进料流量对系统膜通量及能效比等热力参数的影响。结果表明,渗透侧温度降低可引起渗透量增加和能效比减小,且在低渗透侧温度情况下渗透侧温度的改变对能效比影响更大。随着渗透侧温度变化,存在一个渗透侧温度使造水比最大且吨水能耗最小,研究工况下最大造水比可达3.42,最小吨水能耗为463MJ/t,且该最佳渗透侧温度随进料液温度增加而增加。进料液流量增加可引起渗透量和能效比增加,引起吨水能耗升高和造水比降低,当进料液流量小于3L/min时,进料液流量增加对吨水能耗和造水比的负面影响较显著,进料液温度为50℃时,料液流量从1.5 L/min增至3 L/min,造水比的降低幅度可达33.5%;料液流量从4.5 L/min增至6 L/min时,造水比的降低幅度降至10.6%。A novel brine solution concentration system based on the heat pump membrane technology was integrated to improve the membrane flux as well as reduce the consumption of cooling water.This proposed system was simulated by the Aspen Plus platform.After experimentally verifying the system simulation model,influences from the feed liquid temperature,temperature at permeate side and feed flow rate on the overall thermal performance indices of the system were studied.The results showed decreasing temperature at permeate side improved the permeability and decreased of the coefficient of performance(COP),and the change of temperature at permeate side played a great effect on the coefficient of performance under the fixed condition of the low temperature at permeate side.With increase of the temperature at permeate side,an optimal temperature value was obtained to maximize the water production ratio and minimize the energy consumption per ton of water,and the maximal water production ratio was 3.42,the minimal energy consumption per ton of water was 463 MJ/t under the working condition in this research.Besides,as the feed liquid temperature increased,the optimal temperature at permeate side increased.As the feed flow rate rised,permeability and coefficient of performance went up,while the energy consumption of tons of water rised and the water production ratio reduced.Moreover,when the feed flow rate was less than 3 L/min,the energy consumption of tons of water and the water production ratio reduced sharply as the feed flow rate increased.When the feed liquid temperature was 50℃,the feed flow rate increased from 1.5 L/min to 3 L/min,the value of GOR(Gained Output Ratio)decreased by 33.5%,while the rise of flow rate from 4.5 L/min to 6 L/min only caused GOR decrease by 10.6%.

关 键 词：膜蒸馏 热泵 膜通量 能效比 

分 类 号：P747[天文地球—海洋科学] TQ028.8[化学工程]