| 膜蒸馏海水淡化过程研究:三种膜蒸馏过程的比较 |
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| 引用本文： | 赵晶,武春瑞,吕晓龙.膜蒸馏海水淡化过程研究:三种膜蒸馏过程的比较[J].膜科学与技术,2009,29(1). |
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| 作者姓名： | 赵晶 武春瑞 吕晓龙 |
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| 作者单位： | 天津工业大学,中空纤维膜材料与膜过程教育部重点实验室,生物化工研究所,天津,300160 |
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| 基金项目： | 国家科技支撑计划，天津市重大科技攻关项目 |
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| 摘 要： | 采用聚偏氟乙烯(PVDF)中空纤维疏水微孔膜,以质量分数3.5%NaCl水溶液为模拟海水测试液,进行膜蒸馏脱盐实验.比较了真空(VMD)、气扫式(SGMD)和直接接触膜蒸馏(DCMD)过程的脱盐性能,考察了料液温度、流速、浓度以及冷侧冷凝条件等操作条件对过程性能的影响.结果表明:VMD过程的产水通量最高,达到21.8 L/(m2·h);DCMD次之,SGMD最小.三种MD过程的渗透通量均随料液温度的升高而增大,随料液浓度的增加而降低;SG-MD和VMD过程通量分别随冷侧气体流速和真空度增加而提高,而DCMD过程通量则几乎不随冷却水流速变化而改变.SGMD、DCMD和VMD过程的脱盐率分别为99.97%、99.98%和99.99%,几乎不随操作条件而改变.
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| 关 键 词： | 膜蒸馏 海水淡化 聚偏氟乙烯 中空纤维疏水膜 |
Seawater desalination by membrane distillation:a comparison of three processes |
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| ZHAO Jing,WU Chunrui,L Xiaolong.Seawater desalination by membrane distillation:a comparison of three processes[J].Membrane Science and Technology,2009,29(1). |
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| Authors: | ZHAO Jing WU Chunrui L Xiaolong |
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| Affiliation: | Key Laboratory of Hollow Fiber Membrane Materails and Membrane Process Ministry of Education;Institute of Biology and Chemistry Engineering;Tianjin Polytechnic University;Tianjin 300160;China |
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| Abstract: | Microporous hydrophobic polyvinylidene fluoride(PVDF) hollow fiber membrane was employed in the seawater desalination experiment,using 3.5% NaCl aqueous solution as testing solution.The desalination performances of vacuum(VMD),sweeping gas(SGMD),and direct contact membrane distillation(DCMD) processes were compared.The effects of the temperature,velocity,and concentration of the feed solution,together with the condition of the permeate side on the performance of MD processes were studied.The results shows t... |
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| Keywords: | membrane distillation seawater desalination polyvinylidene fluoride hydrophobic hollow fiber membrane |
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