Thermodynamic analysis of a freeze-dryer utilizing hygroscopic solution
Thermodynamic analysis of a freeze-dryer utilizing hygroscopic solution
复制标题
利用吸湿溶液的冷冻干燥机的热力学分析
DOI：
10.1080/07373937.2017.1308952
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发表时间：
2018-02
影响因子：
3.3
通讯作者：
Wang Qin
中科院分区：
文献类型：
--
作者：
Zhang Shaozhi;Luo Jielin;Chen Guangming;Wang Qin
摘要冷冻干燥通常应用于生物制品、药品和高价值食品的干燥。传统的冷冻干燥设备运行成本高、能耗大，限制了冷冻干燥技术的广泛应用。本文提出了一种基于吸湿溶液封闭再生回路的冷冻干燥机。采用吸湿溶液如氯化锂-水溶液作为工作流体，吸收材料升华后的水蒸气。吸湿溶液的低蒸气压导致水蒸气吸收器的操作温度比传统蒸气冷凝器的操作温度更高。通过热力学分析说明了这种新型冷冻干燥机的优点。以咖啡为例进行的研究表明，制冷系统的性能改善系数为25.1%，能耗降低14.6%，其中由于再生热的再利用，热耗降低8.0%。对蒸发温度和冷凝温度的影响进行了参数分析。结果表明，新型冷冻干燥机在较宽的操作范围内具有很大的节能潜力。并对食品冻干过程中使用吸湿溶液的安全性问题进行了讨论。综合考虑其他益处，相信这种冷冻干燥机在食品的实际冷冻干燥中是有希望的。
ABSTRACT Freeze-drying is usually applied to dry bioproducts, pharmaceuticals, and high-valued foodstuffs. Due to high running cost and energy consumption of conventional freeze dryers, wider applications of freeze-drying technology are restricted. A freeze dryer based on a closed regeneration loop of hygroscopic solution is proposed here. Hygroscopic solutions such as LiCl–water solution are used as working fluid to absorb the vapor sublimated from the stuffs. The low vapor pressure of hygroscopic solution leads to a higher operating temperature of water vapor absorber compared with the operating temperature of traditional vapor condenser. Thermodynamic analyses are conducted to illustrate the advantages of this new freeze dryer. A case study performed with coffee shows a coefficient of performance improvement of 25.1% of the refrigeration system and a reduction of 14.6% of energy consumption, in which 8.0% cut of heat consumption is obtained because of the reuse of regeneration heat. Parametric analyses on the impacts of evaporation temperature and condensing temperature are also performed. It is demonstrated that the new freeze dryer has high potential of energy saving in wide operation ranges. The security issue of using hygroscopic solution in food freeze-drying has also been discussed. Considering other benefits altogether, it is believed that such a freeze dryer is promising in practical freeze-drying of foodstuffs.
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影响因子：
3.3
作者：
Z. Irzyniec;J. Klimczak;S. Michałowski
通讯作者：
Z. Irzyniec;J. Klimczak;S. Michałowski
影响因子：
3.3
作者：
Öznur Cumhur;Mahmut Şeker;H. Sadıkoğlu
通讯作者：
Öznur Cumhur;Mahmut Şeker;H. Sadıkoğlu
影响因子：
10.2
作者：
C. Judson King;T. Labuza
通讯作者：
C. Judson King;T. Labuza
影响因子：
2.6
作者：
Patek, J.;Klomfar, J.
通讯作者：
Klomfar, J.
影响因子：
6.4
作者：
Xian-min Guo;Yi-guang Chen;Wen Wang;Chunzheng Chen
通讯作者：
Xian-min Guo;Yi-guang Chen;Wen Wang;Chunzheng Chen