Application of vacuum membrane distillation to lithium bromide absorption refrigeration system
Application of vacuum membrane distillation to lithium bromide absorption refrigeration system
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DOI：
10.1016/j.ijrefrig.2009.07.002
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发表时间：
2009-11
期刊：
影响因子：
--
通讯作者：
Zanshe Wang;Z. Gu;S. Feng;Yun Li
中科院分区：
文献类型：
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作者：
Zanshe Wang;Z. Gu;S. Feng;Yun Li
溴化锂吸收式制冷系统中的传统发电机过于庞大和笨重，无法安装到小型设备中，并且发电机中驱动加热器的温度似乎远高于再生能源或废热能源等低品位能源。本文提出了真空膜蒸馏脱附溴化锂水溶液的工艺。采用聚偏二氟乙烯制成的中空纤维膜组件作为溴化锂水溶液的解吸装置。采用正交试验对进料流量、内腔进料温度和壳程真空压力的影响因素进行了测试和分析。结果表明，水蒸气的渗透通量随着进料温度的升高和管腔侧进料通量的增加而增加，并且渗透通量也随着壳程绝对压降的增加而增加。可行性及潜在应用分析表明，驱动热温度低，解吸装置体积和重量轻。本研究中，真空膜蒸馏应用于溴化锂吸收式制冷系统已被证明是一种高效且廉价的解吸方式。
Conventional generator in lithium bromide absorption refrigeration system is too bulky and heavy to be fitted into small scale device, and the temperature of the driving heater in the generator seems much higher than low grade energy such as regenerative energy or waste heat energy. In this paper, desorption of aqueous lithium bromide solution by vacuum membrane distillation process was presented. Hollow fiber membrane module made by polyvinylidene fluoride was used as desorption device of aqueous lithium bromide solution. Influencing factors of feed flux, feed temperature in lumen side and vacuum pressure in shell side were tested and analyzed with orthogonal test. The results showed that permeation flux of water vapor increased with the feed temperature increasing and the feed flux increasing in lumen side, and the permeation flux also went up along with absolute pressure drop in shell side. Feasibility and potential application analysis shows that the temperature of the driving heat was low and the volume and weight of the desorption device was light. In this study, vacuum membrane distillation to the lithium bromide absorption refrigeration system has proved to be an efficient and cheap desorption mode.