Performance characteristics of an integrated power generation system combining gas turbine combined cycle, carbon captur
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DOI 10.1007/s12206-020-0923-8
Journal of Mechanical Science and Technology 34 (10) 2020 Original Article DOI 10.1007/s12206-020-0923-8 Keywords: · Gas turbine combined cycle · Oxygen injection · Performance analysis · Power to methane · Steam injection
Correspondence to: Tong Seop Kim [email protected]
Citation: Won, D. H., Kim, M. J., Lee, J. H., Kim, T. S. (2020). Performance characteristics of an integrated power generation system combining gas turbine combined cycle, carbon capture and methanation. Journal of Mechanical Science and Technology 34 (10) (2020) 4333~4344. http://doi.org/10.1007/s12206-020-0923-8
Received January 15th, 2020 Revised
July 7th, 2020
Accepted July 28th, 2020 † Recommended by Editor Yong Tae Kang
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Performance characteristics of an integrated power generation system combining gas turbine combined cycle, carbon capture and methanation Dong Hyeok Won1, Min Jae Kim1, Jae Hong Lee1 and Tong Seop Kim2 1
2
Graduate School, Inha University, Incheon 22212, Korea, Dept. of Mechanical Engineering, Inha University, Incheon 22212, Korea
Abstract
This study analyzes the performance of an integrated power generation system that combines a gas turbine combined cycle (GTCC) with a methanation process. The methanation process uses hydrogen provided by a power-to-gas (PtG) process and carbon dioxide captured from the exhaust gas of the GTCC. The research aim was to maximize the GTCC performance through an effective integration between the GTCC and methanation. Two methods were proposed to utilize the steam generated from the methanation process. One was to supply it to the steam turbine bottoming cycle of the GTCC, and the other was to inject it into the GT combustor. Also investigated was the injection of oxygen generated in the PtG process into the gas turbine combustor. The largest improvements in the power and efficiency were predicted to be 19.3 % and 4.9 % through the combination of the steam supply to the bottoming cycle and the oxygen injection to the combustor.
1. Introduction The use of renewable energy is increasing rapidly because of escalating concerns about global warming and air pollution. Worldwide renewable power capacity is expected to increase by 1200 GW(50 %) between 2019 and 2024 [1]. Most of the increase in renewable energy is in solar and wind power. Solar photovoltaic (PV) energy alone accounts for almost 60 % of the expected growth and onshore wind power accounted for one quarter. However, solar and wind power is intermittent and fluctuates, whereas the electric energy in a conventional power system is controllable. Hence, the power grid might become unstable as the capacity of renewable energy increases in electric power grids. One solution is to store a large part of the generated renewable energy in energy storage systems (ESSs) to supply it stably to the power grid [2]. To select an appropriate ESS, many options including type selection, optimal sizing, and contr
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