用于低干度混合工质制冷的板翅式换热器传热系数

doi:10.11949/j.issn.0438-1157.20151177

化工学报 ›› 2016, Vol. 67 ›› Issue (4): 1277-1286.DOI: 10.11949/j.issn.0438-1157.20151177

用于低干度混合工质制冷的板翅式换热器传热系数

曹乐¹, 刘金平^1,2, 许雄文^1,2, 李日新¹

1. 华南理工大学电力学院, 广东广州 510640;
2. 广东省能源高效清洁利用重点实验室, 广东广州 510640

收稿日期:2015-07-22 修回日期:2015-09-28 出版日期:2016-04-05 发布日期:2016-04-05
通讯作者: 许雄文
基金资助:
华南理工大学亚热带建筑科学国家重点实验室基金项目(2015ZC13);广东省能源高效清洁利用重点实验室(华南理工大学)项目(2013A061401005);中央高校基本科研业务费专项资金资助项目(2015ZM028)。

Overall heat transfer coefficient of plate-fin heat exchanger during a mixed refrigerant cryogenic process in low quality

CAO Le¹, LIU Jinping^1,2, XU Xiongwen^1,2, LI Rixin¹

1. School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China;
2. Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou 510640, Guangdong, China

Received:2015-07-22 Revised:2015-09-28 Online:2016-04-05 Published:2016-04-05
Supported by:
supported by the State Key Laboratory of Subtropical Building Science (2015ZC13), the Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization (2013A061401005) and the Fundamental Research Funds for the Central Universities (2015ZM028).

摘要/Abstract

摘要：

对于中小型天然气液化装置,板翅式换热器被广泛应用于回热换热。然而,目前对低干度混合工质在板翅式换热器中低温换热性能优化等问题的研究甚少。因此,搭建一套采用单级压缩、一级回热的Linde-Hampson制冷循环系统,并以N₂-CH₄-C₂H₄-C₃H₈-iC₄H₁₀作为混合制冷剂制取-160℃低温,用以重点分析板翅式换热器中的总传热系数以及影响板翅式换热器传热系数的因素。实验结果表明:低干度下板翅式换热器中总传热系数在2.6~22.7 W·m^-2·K^-1之间,受制冷温度和循环浓度变化的影响不明显,而目前对低干度低流速下混合制冷剂的低温换热性能预测仍存在一定的偏差,其中Cavallini和Modified Granryd的计算模型经修正后可推荐使用;同时,也从制冷剂流速、压降等方面对板翅式换热器优化设计提出了相关建议。

关键词: 天然气, 液化, 混合工质, 板翅式换热器, 低温制冷, 传热, 传热系数, 压降

Abstract:

Plate-fin heat exchangers (PFHEs) are mostly employed in medium- and small-sized LNG plants. However, works about the heat transfer characteristic optimization of mixed refrigerant in PFHE under low quality have been barely carried out nowadays. Thus, a Linde-Hampson cycle using single stage compressors and recuperative heat exchanger was established and mixed refrigerant (N₂-CH₄-C₂H₄-C₃H₈-iC₄H₁₀) was used to obtain the refrigeration temperature of -160℃. Meanwhile, the overall heat transfer coefficient and the correlational influence factor were mainly analysed. The experimental results showed that the overall heat transfer coefficient of the PFHE was about 2.6—22.7 W·m^-2·K^-1 while the refrigeration temperature and the circulated composition had week influence on the overall heat transfer coefficient. Meanwhile, the existing correlations cannot accurately predict the heat transfer coefficient of the mixed refrigerant under low quality and low flow velocity. However, the correlation of Cavallini and modified Granryd can used to predict the HTC of mixed refrigerant under low quality and low flow velocity after modification in this work. Additionally, some suggestion have been proposed in the design and optimization of PFHEs considering the refrigerate flowrate and pressure drop.

Key words: natural gas, liquefaction, mixed refrigerant, plate-fin heat exchanger, cryogenic, heat transfer, heat transfer coefficient, pressure drop

中图分类号:

TB61⁺1

曹乐, 刘金平, 许雄文, 李日新. 用于低干度混合工质制冷的板翅式换热器传热系数[J]. 化工学报, 2016, 67(4): 1277-1286.

CAO Le, LIU Jinping, XU Xiongwen, LI Rixin. Overall heat transfer coefficient of plate-fin heat exchanger during a mixed refrigerant cryogenic process in low quality[J]. CIESC Journal, 2016, 67(4): 1277-1286.

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用于低干度混合工质制冷的板翅式换热器传热系数

Overall heat transfer coefficient of plate-fin heat exchanger during a mixed refrigerant cryogenic process in low quality

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