【作者】 谭宏博； 厉彦忠； 脱瀚斐； 田宝聪； 周满；

【Author】 Tan Hongbo LI Yanzhong Tuo Hanfei Tian Baocong Zhou Man (School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

【机构】 西安交通大学能源与动力工程学院；

【摘要】 对一种内波纹翅片管在液化天然气(LNG)冷量回收的相变蓄冷装置中的应用进行单管实验,液氮代替LNG汽化复温到一定低温下通入内翅片管内,水作为相变材料在管外冻结蓄冷。通过光学测量手段获得冰层图相,并测量管内低温气体、管壁及液相区温度,结果表明:内波纹翅片管外冰层增长速度沿管长方向迅速减小,且冰层在径向增长的同时沿轴向"爬伸";气体入口温度越低、流量越大,各处冰层径向增长速度和轴向"爬伸"速度均增加。冰层沿管长抛物线状分布,轴向斜率随时间呈对数增长至50-60mm/m。本研究对LNG低温冷藏车蓄冷单元的结构设计和性能优化具有指导意义。更多还原

【Abstract】 Ice formation around a single wave-like internally finned tube to recover the Liquefied Natural Gas (LNG) cold energy was investigated experimentally. Liquefied nitrogen substituting LNG was vaporized and heated to a predetermined low temperature and flew into the tube. Water was solidified outside the tube surface to store the cryogenic gas cold energy. Ice profiles were recorded with optical technique and the temperatures of cryogenic gas, tube wall and bulk region were measured. The results show that the ice growth rates decreased rapidly along the tube length. Radial increasing and axial propagating of ice layer occurred simultaneously. At certain axial position for different tests, both radial growth and axial propagation rate of ice layer went up with lower cryogenic gas inlet temperature or higher flow rate. The phase interface displayed the parabolic shape whose axial slope increased to 50-60 mm/m as a logarithmic function of freezing time. This investigation will provide guidelines for the structural design and optimization of the cold storage unit of LNG refrigerated vehicles.更多还原