Effects of solid adsorption on vacuum flash water separation process with heat pipe

doi:10.11949/j.issn.0438-1157.20151909

Abstract

Abstract:

The superheat is the key factor for liquid drop to keep evaporating and it determines the water separation rate of the solute/water separator. A solute/water separation device combined with high efficient heat pipe and solid adsorption technology is developed in this paper. Water separation experiment of NaCl solution with concentration of 3% is conducted and the results show that the heat pipe can rapidly transfer heat to the drop just flashed for the second boiling with high heat flux and increase the water separation rate per unit volume. During the front half part of the adsorption process, the evaporator pressure value has a significant decrease by 0.4-1 kPa than that without adsorbent bed. Namely, the boiling point of drop is reduced and superheat is increased. This provides a new method for utilizing lower grade heat source in the solute/water separation.

Key words: heat pipe, solid adsorption, vacuum, flashing, water separation

摘要：

液滴的过热度是维持其蒸发的关键因素，直接决定了盐水分离设备的水分离率。提出和设计了一种集高效热管传热和固体吸附技术为一体的盐水分离装置，并对质量分数为3%的NaCl溶液进行水分离实验，结果表明：热管能以高热通量快速传递液体闪蒸后二次沸腾所需的热量，显著增加单位时间内的水分离容积速率；引入吸附床后，蒸发室压力在吸附过程前半段有明显降低，降幅约为0.4～1 kPa，即降低了液滴的沸点，提升了过热度，这为更低品位的热源在盐水分离方面的利用提供了新途径；降低热源温度，吸附剂的吸附能力相应降低，要达到同样的水分离速率，需增加吸附剂用量。

关键词: 热管, 固体吸附, 真空, 闪蒸, 水分离

CLC Number:

TK124

GAO Wenzhong, XU Changda, LI Changsong, WANG Dong, SU Tianlong. Effects of solid adsorption on vacuum flash water separation process with heat pipe[J]. CIESC Journal, 2016, 67(9): 3755-3761.

高文忠, 徐畅达, 李长松, 王栋, 苏天龙. 固体吸附作用对热管真空闪蒸水分离过程的影响[J]. 化工学报, 2016, 67(9): 3755-3761.

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