新型空气隙膜蒸馏组件用于海水淡化
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摘要
设计了一种基于中空纤维膜的螺旋缠绕式空气隙膜蒸馏组件,以模拟海水为原料液,考察了热料液进口温度T3、料液流量F、缠绕角度、空气隙厚度、内芯长度对膜通量和造水比的影响。实验结果表明,膜通量和造水比均随着热料液进口温度的增加而明显增大;当料液流量增加时,膜通量增大,造水比呈相反趋势;随着空气隙厚度的增加,膜通量和造水比均逐渐减小;膜通量和造水比均随着缠绕角度的增加而减小;内芯长度增加使得造水比提高,而膜通量则降低。实验过程中膜通量和造水比的最高值分别达到6.1 kg/(m~2·h)和5.8,产水电导率始终保持在20.0μS/cm以下。
A spirally wound air-gap membrane distillation module based on hollow fiber is designed for seawater desalination.Taking simulated seawater as feed liquid,the effect of the inlet temperature of hot feed,hot feed flow rate,winding angle,air gap thickness and the length of inner core on membrane permeate flux( JW) and gained output ratio( GOR) are studied.The results show that both JWand GOR increase with the increasing inlet temperature of hot feed.When the hot feed flow rate increases,JWwill increase while GOR will decrease. Both JWand GOR decrease with increasing air gap thickness and winding angle.A larger length of inner core will make JWincrease and draw GOR to drop.The maximum of JWis 6. 1 kg·m~(-2)·h~(-1) and that of GOR is 5. 8 during the experiments. The permeate conductivity has remained below 20. 0 μS·cm~(-1).
A spirally wound air-gap membrane distillation module based on hollow fiber is designed for seawater desalination.Taking simulated seawater as feed liquid,the effect of the inlet temperature of hot feed,hot feed flow rate,winding angle,air gap thickness and the length of inner core on membrane permeate flux( JW) and gained output ratio( GOR) are studied.The results show that both JWand GOR increase with the increasing inlet temperature of hot feed.When the hot feed flow rate increases,JWwill increase while GOR will decrease. Both JWand GOR decrease with increasing air gap thickness and winding angle.A larger length of inner core will make JWincrease and draw GOR to drop.The maximum of JWis 6. 1 kg·m~(-2)·h~(-1) and that of GOR is 5. 8 during the experiments. The permeate conductivity has remained below 20. 0 μS·cm~(-1).
引文
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[16]Alsaadi A S,Ghaffour N,Li J D,et al.Modeling of air-gap membrane distillation process:A theoretical and experimental study[J].Journal of Membrane Science,2013,445(41):53-65.
[2]Wang G S,Ke H,Gray S,et al.Solar energy assisted direct contact membrane distillation(DCMD)process for seawater desalination[J].Separation&Purification Technology,2015,143:94-104.
[3]Guijt C M,Meindersma G W,Reith T,et al.Air gap membrane distillation:2.Model validation and hollow fibre module performance analysis[J].Separation&Purification Technology,2005,43(3):245-255.
[4]Abu-Zeid E R,Zhang L,Jin W Y,et al.Improving the performance of the air gap membrane distillation process by using a supplementary vacuum pump[J].Desalination,2016,384:31-42.
[5]Moradi R,Karimi-Sabet J,Shariaty-Niassar M,et al.Air gap membrane distillation for enrichment of H218O isotopomers in natural water using poly(vinylidene fluoride)nanofibrous membrane[J].Chemical Engineering&Processing Process Intensification,2016,100:26-36.
[6]Maab H,Saadi A A,Francis L,et al.Polyazole hollow fiber membranes for direct contact membrane distillation[J].Industrial&Engineering Chemistry Research,2013,52(31):10425-10429.
[7]Tang N,Wang S,Wang W,et al.Impact of characteristic parameters of PVDF hollow fiber membrane module on the performance of VMD process for desalinating brine[J].Membrane Science&Technology,2013,33(4):63-67.
[8]Wang Z,Cui F,Wang G,et al.Analysis of DCMD-based hollow fiber membrane heat exchanger[J].Journal of Chemical Engineering of Japan,2013,46(9):573-582.
[9]Sun A C,Kosar W,Zhang Y,et al.Vacuum membrane distillation for desalination of water using hollow fiber membranes[J].Journal of Membrane Science,2014,455(455):131-142.
[10]Zhang J,Li J D,Gray S.Effect of applied pressure on performance of PTFE membrane in DCMD[J].Journal of Membrane Science,2011,369(1-2):514-525.
[11]Yao K,Qin Y,Yuan Y,et al.A continuous-effect membrane distillation process based on hollow fiber AGMD module with internal latent-heat recovery[J].Aiche Journal,2013,59(4):1278-1297.
[12]Cheng L H,Wu P C,Chen J.Numerical simulation and optimal design of AGMD-based hollow fiber Modules for desalination[J].Ind Eng Chem Res,2009,48(10):4948-4959.
[13]Trimmer J L.Tubesheet for spiral wound hollow fiber permeator:EP,US4652373[P].1987-09-26.
[14]李利君.中空纤维膜组件壳程传质性能及强化的研究[D].北京:北京化工大学,2005.
[15]刘丽英,李利君,丁忠伟,等.缠绕式中空纤维膜组件强化膜两侧传质过程[J].膜科学与技术,2005,25(6):17-20.
[16]Alsaadi A S,Ghaffour N,Li J D,et al.Modeling of air-gap membrane distillation process:A theoretical and experimental study[J].Journal of Membrane Science,2013,445(41):53-65.