化工学报2016，Vol.67Issue(4)：1277-1286,10.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
Overall heat transfer coefficient of plate-fin heat exchanger during a mixed refrigerant cryogenic process in low quality
摘要
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.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Key words
natural gas/liquefaction/mixed refrigerant/plate-fin heat exchanger/cryogenic/heat transfer/heat transfer coefficient/pressure drop分类
通用工业技术引用本文复制引用
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):1277-1286,10.基金项目
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）。@@@@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) （2015ZC13）
