Liquefied natural gas (LNG) contains considerable cold energy because a significant amount of energy is consumed to produce low-temperature LNG. So, finding a good way to utilize the LNG effectively, particularly its cold energy, is an important issue to solve the problem of energy crisis. In the present study, a new CCHP system utilizing liquid natural gas is proposed to provide cooling, heat and electricity output simultaneously to meet user’s different energy requirements. This CCHP system consists of a gas/steam combined cycle and an ejector refrigeration cycle. For cold energy utilization, LNG is firstly considered as a heat sink to condense the steam turbine exhaust in Rankine cycle, then cools down the suction air of compressor in Brayton cycle, and finally enters the combustion chamber after preheated by HRSG exhaust. The steam turbine has two streams of extraction steam. One is used to drive an ejector refrigeration cycle to produce the cooling effect, and the other is used to provide the heat. To evaluate the system performance, the exergy efficiency is selected as an evaluation criterion to eliminate the difference of energy quality. A thermodynamic simulation of the new CCHP system utilizing LNG is achieved using a simulation program. A parametric analysis is conducted to examine the effects of several key thermodynamic parameters on the performance of the proposed CCHP system. The results indicate that as gas turbine inlet temperature, pressure ratio of compressor and steam turbine inlet pressure increase, the exergy efficiency increases. In addition, as steam turbine back pressure, extraction mass rate ratio for heat, extraction mass rate ratio and extraction pressure for refrigeration increase, the exergy efficiency decreases.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4400-7
PROCEEDINGS PAPER
Parametric Analysis of a New CCHP System Utilizing Liquefied Natural Gas (LNG) Available to Purchase
Jiangfeng Wang,
Jiangfeng Wang
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Yiping Dai,
Yiping Dai
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Zhixin Sun,
Zhixin Sun
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Shaolin Ma
Shaolin Ma
Dongfang Steam Turbine Works, Deyang, Sichuan, China
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Jiangfeng Wang
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Yiping Dai
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Zhixin Sun
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Shaolin Ma
Dongfang Steam Turbine Works, Deyang, Sichuan, China
Paper No:
GT2010-22319, pp. 77-86; 10 pages
Published Online:
December 22, 2010
Citation
Wang, J, Dai, Y, Sun, Z, & Ma, S. "Parametric Analysis of a New CCHP System Utilizing Liquefied Natural Gas (LNG)." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 5: Industrial and Cogeneration; Microturbines and Small Turbomachinery; Oil and Gas Applications; Wind Turbine Technology. Glasgow, UK. June 14–18, 2010. pp. 77-86. ASME. https://doi.org/10.1115/GT2010-22319
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