Thermodynamic analysis of a novel hybrid solar-LNG cold energy recovery system

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Ji, W.^1 ; Zhou, Y.^1 ; Chen, L.B.^1 ; An, B.L.^1 ; Chen, J.X.^1 ; Wang, J.J.^1^2

CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing

100190, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

关键词: Exergy efficiencies;    Inlet temperature;    Low temperatures;    Operating parameters;    Re-gasification;    Refrigeration cycles;    Solar thermal energy;    Thermo dynamic analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012145/pdf
DOI  :  10.1088/1757-899X/502/1/012145

来源: IOP

【 摘 要 】

Due to the low temperature of LNG (liquefied natural gas), there is abundant cold energy can be utilized during the regasification process. Therefore a novel hybrid solar-LNG cold energy recovery system was proposed. In this system, LNG cold energy is used as a heat sink for a propane Rankine power cycle and a cascaded ethylene glycol refrigeration cycle. Then through a direct expanding combined with the preheating of solar thermal energy, more power is generated by the regasified LNG. A thermodynamic analysis was carried out to investigate the best system design. Meanwhile, the influences of some key operating parameters on net output power and exergy efficiency were investigated. The results show that higher inlet temperature and pressure of NTB (natural gas turbine) are beneficial to system performance.