低温多效-热压缩海水淡化混流效组系统模拟研究  

System Simulation of Low Temperature Multi-Effect Evaporation Desalination-Thermal Vapor Compression with Mixed Feed Flow

作　　者：杜亚威[1] 解利昕 徐世昌 宿立波 刘燕[1] 郭晓俊 DU Yawei;XIE Lixin;XU Shichang;SU Libo;LIU Yan;GUO Xiaojun(Tianjin Key Laboratory of Chemical Process Safety,School of Chemical Engineering and Technology,Hebei University of Technology,300130;Tianjin Key Laboratory of Membrane Science and Desalination Technology,School of Chemical Engineering and Technology,Tianjin University,300072:Tianjin,China)

机构地区：[1]河北工业大学化工学院,天津市本质安全化工技术重点实验室,300130 [2]天津大学化工学院,天津市膜科学与海水淡化技术重点实验室,天津300072

出　　处：《水处理技术》2021年第12期30-36,共7页Technology of Water Treatment

基　　金：国家重点研发计划(2016YFC0401202);河北省引进留学人员资助项目(C20200311);河北省高等学校青年拔尖人才计划项目(BJ2016016);河北省自然科学基金(B2018202120)。

摘　　要：建立了混流效组低温(LT)多效蒸发(MED)-热压缩(TVC)海水淡化系统的数学模型,分析了不同抽气位置和操作参数对10效系统设计的影响。结果表明,随着TVC引射位置从第2效向末效方向移动,造水比GOR呈现先增大后减小的趋势,而传热面积逐渐增加。针对4效+3效+3效组合,当TVC抽气位置位于第9效时GOR最高,与第2效抽气位置相比增幅可达58.8%,传热面积只需增加24.0%。随着最高浓盐水温度和压缩蒸汽压力的增加,TVC引射系数逐渐增加,造水比和换热面积均呈下降趋势。在实际工程设计时,需权衡系统投资(换热面积)和操作成本(动力蒸汽消耗),选择合适的最高浓盐水温度和压缩蒸汽压力。模拟结果与实际工程相关数据吻合良好,可为工程化设计提供理论和技术支持。A mathematical model of low-temperature(LT)multi-effect evaporation(MED)-thermal vapor compression(TVC)desalination system is established,and the influences of different pumping positions and operating parameters on the design of a 10-effect system are analyzed.The results showed that the gain output ratio(GOR)was first increased and then decreased as the TVC suction position moves from the second to the final effect,while the heat transfer area increases gradually.For a(4 effects+3 effects+3 effects)configuration,when the suction position is located at the 9th effect,the GOR is the highest.Compared with the second effect,the GOR can increase by 58.8%.The heat transfer area only needs to increase by 24.0%.With the increase of the top brine temperature and the pressure of the compressed steam,the TVC entrainment ratio is increased gradually,while the water production ratio and the heat exchange area are decreased.In the actual engineering design,it is necessary to balance the system investment(heat transfer area)and operation cost(heating steam consumption),selecting appropriate top brine temperature and compressed steam pressure.The simulation results are in good agreement with the actual engineering data,which could provide theoretical and technical support for engineering design.

关 键 词：海水淡化 多效蒸发 热压缩 模拟 

分 类 号：P747[天文地球—海洋科学]