Integration of Low-level Waste Heat Recovery and Liquefied Nature Gas Cold Energy Utilization

Two novel thermal cycles based on Brayton cycle and Rankine cycle are proposed, respectively, which integrate the recovery of low-level waste heat and Liquefied Nature Gas (LNG) cold energy utilization for power generation. Cascade utilization of energy is realized in the two thermal cycles, where low-level waste heat, low-temperature exergy and pressure exergy of LNG are utilized efficiently through the system synthesis. The simulations are carried out using the commercial Aspen Plus 10.2, and the results are analyzed. Compared with the conventional Brayton cycle and Rankine cycle, the two novel cycles bring 60.94% and 60% in exergy efficiency, respectively and 53.08% and 52.31% in thermal efficiency, respectively.

[1]  Cai Rui-xian.  THERMODYNAMIC ANALYSIS OF CLOSED BRAYTON CYCLE WORKING ON LNG CRYOGENIC EXERGY AND WASTE HEAT UTILIZATION , 2003 .

[2]  Gao Lin.  A NOVEL BINARY CYCLE WITH INTEGRATION OF LOW-LEVEL WASTE HEAT RECOVERY & LNG COLD ENERGY UTILIZATION , 2002 .

[3]  Eva Thorin,et al.  Ammonia–water power cycles for direct-fired cogeneration applications , 1998 .

[4]  Wang Qiang,et al.  Analysis of power cycle based on cold energy of liquefied natural gas and low-grade heat source , 2004 .

[5]  Cao Wen-sheng,et al.  Cold Energy Utilization of Liquefied Natural Gas , 2005 .

[6]  Hongtan Liu,et al.  Characteristics and applications of the cold heat exergy of liquefied natural gas , 1999 .

[7]  Y Yamasaki,et al.  Proposal for a high efficiency LNG power-generation system utilizing waste heat from the combined cycle , 1998 .

[8]  Tae-Seung Kim,et al.  Power augmentation of combined cycle power plants using cold energy of liquefied natural gas , 2000 .

[9]  Kwang J. Kim,et al.  Second law analysis and optimization of a combined triple power cycle , 2002 .

[10]  L. Tagliafico,et al.  On the recovery of LNG physical exergy by means of a simple cycle or a complex system , 2002 .

[11]  Yong Tae Kang,et al.  A combined power cycle using refuse incineration and LNG cold energy , 2000 .

[12]  A.Sari,et al.  First and Second Laws Analyses of a Closed Latent Heat Thermal Energy Storage System , 2004 .

[13]  Yousef S.H. Najjar,et al.  Enhancement of performance of gas turbine engines by inlet air cooling and cogeneration system , 1996 .