水-水降膜蒸发器的模拟仿真和优化

doi:10.11949/j.issn.0438-1157.20181118

化工学报 ›› 2018, Vol. 69 ›› Issue (S2): 68-75.DOI: 10.11949/j.issn.0438-1157.20181118

水-水降膜蒸发器的模拟仿真和优化

闫鸿志, 胡斌, 王如竹

上海交通大学制冷与低温工程研究所, 上海 200240

收稿日期:2018-10-08 修回日期:2018-10-28 出版日期:2018-12-31 发布日期:2018-12-31
通讯作者: 胡斌
基金资助:
国家自然科学基金青年科学基金项目（51706131）。

Modeling and optimization of water-to-water falling film evaporator

YAN Hongzhi, HU Bin, WANG Ruzhu

Institution of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2018-10-08 Revised:2018-10-28 Online:2018-12-31 Published:2018-12-31
Supported by:
supported by the National Natural Science Foundation of China (51706131).

摘要/Abstract

摘要：

由于具有换热性能突出、制冷剂充注量小等优点，降膜蒸发器已被广泛应用于海水淡化等行业。然而，由于存在液位控制和干斑效应等实际操作问题，在压缩式制冷系统中，降膜蒸发器的设计还需要进一步优化。为解决这个问题，构建了水-水降膜蒸发器的仿真模型。采用有限元方法，获得了沿管程的温度、热流变化情况。对于现有的四管程降膜蒸发器，在80℃蒸发沸腾和0.4 kg·s⁻¹的喷淋量下，为获得最大的换热量，进行了详细的模拟计算，基于模型的计算结果，建议采用两管程降膜、两管程满液的液位控制方式。本模型同时给出了沿管程换热时的传热系数分布情况，提出了满液降膜分界线，为后续的降膜蒸发器结构设计优化提供了新思路。

Abstract:

With the advantages of excellent heat transfer performance and less refrigerant charge, falling film evaporator has been widely used in seawater desalination and other industries. However, due to the practical problems of liquid level control and dry patches interactions, the structure design of falling film evaporator should be optimized for refrigeration applications. To resolve those problems, a simulation model for water-to-water falling film evaporator was conducted in this paper. Through the finite volume method, the temperature distribution along the working tubes and the heat exchanger has been obtained. For an existed falling film evaporator with 4-pass working tubes under boiling temperature of 80℃ and spraying mass of 0.4 kg·s^-1, it is suggested that 2-pass working tubes should be in falling film region in order to arrive the largest heating capacity. The distribution of heat transfer coefficient along the tube is also investigated. Finally, it is proposed that there exits an optimal boundary line between full liquid and falling film region. It may provide a new idea for optimal design of falling film evaporators.

中图分类号:

TH45
TB61

闫鸿志, 胡斌, 王如竹. 水-水降膜蒸发器的模拟仿真和优化[J]. 化工学报, 2018, 69(S2): 68-75.

YAN Hongzhi, HU Bin, WANG Ruzhu. Modeling and optimization of water-to-water falling film evaporator[J]. CIESC Journal, 2018, 69(S2): 68-75.

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水-水降膜蒸发器的模拟仿真和优化

Modeling and optimization of water-to-water falling film evaporator

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