Performance enhancement of conventional combined cycle power plant by inlet air cooling,inter-cooling and LNG cold energy utilization |
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| Authors: | Xiaojun Shi Brian Agnew Defu Che Jianmin Gao |
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| Affiliation: | 1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. School of the Built Environment, Northumbria University, Newcastle upon Tyne, UK;3. State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;1. Department of Mechanical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran;2. Faculty of Mechanical Engineering, University of Tabriz, Iran;1. Department of Chemistry, Jinan University,Guangzhou 510632, China;2. Reseach Center of Nautral Gas Utilization, South China University of Technology, Guangzhou 510640, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, No. 8, Xindu Ave., Xindu District, Chengdu 610500, China;2. Trenchless Technology Center, Louisiana Tech University, 599 Dan Reneau Dr., Engineering Annex, Ruston, LA 71270, USA |
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| Abstract: | This paper has proposed an integrated advanced thermal power system to improve the performance of the conventional combined cycle power plant. Both inlet air cooling and inter-cooling are utilized within the proposed system to limit the decrease of the air mass flow contained in the given volume flow as well as reduce the compression power required. The latent heat of spent steam from a steam turbine and the heat extracted from the air during the compression process are used to heat liquefied natural gas (LNG) and generate electrical energy. The conventional combined cycle and the proposed power system are simulated using the commercial process simulation package IPSEpro. A parametric analysis has been performed for the proposed power system to evaluate the effects of several key factors on the performance. The results show that the net electrical efficiency and the overall work output of the proposed combined cycle can be increased by 2.8% and 76.8 MW above those of the conventional combined cycle while delivering 75.8 kg s?1 of natural gas and saving 0.9 MW of electrical power by removing the need for sea water pumps used hitherto. Compared with the conventional combined cycle, the proposed power system performance has little sensitivity to ambient temperature changes and shows good off-design performance. |
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