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.
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Abbreviations
- A :
-
Area (m2)
- CCP :
-
Carbon capture process
- C p :
-
Constant pressure heat capacity (kJ/kg·K)
- CR :
-
Capture rate
- CSU :
-
Carbon separation unit
- h :
-
Enthalpy (kJ/kg)
- HHV :
-
Higher heating value (kJ/kg)
- HPST :
-
High pressure steam turbine
- LHV :
-
Lower heating value (kJ/kg)
- LPST :
-
Lower pressure steam turbine
- MP :
-
Methanation process
- \(\dot m\) :
-
Mass flow rate (kg/s)
- N :
-
Rotation speed (RPM)
- PR :
-
Pressure ratio
- SG :
-
Specific gravity
- T :
-
Temperature (K)
- U :
-
Overall heat transfer coefficient (kW/m2K)
- W :
-
Power (kW)
- e :
-
Effectiveness
- Y :
-
Specific heat ratio
- n :
-
Efficiency
- c:
-
Cold side
- CC:
-
Gas turbine combined cycle
- CCP:
-
Carbon capture process
- Comp:
-
Compressor
- d:
-
Design
- e:
-
Electricity
- hg:
-
Gas
- gear:
-
Gearbox
- gen:
-
Generator
- GT:
-
Gas turbine
- h:
-
Hot side
- HP:
-
High pressure
- in:
-
Inlet
- LP:
-
Low pressure
- Max:
-
Maximum
- mech:
-
Mechanical
- Min:
-
Minimum
- Mix:
-
Mixture
- MP:
-
Methanation process
- NG:
-
Natural gas
- out:
-
Outlet
- P:
-
Pump
- rev:
-
Revision
- s:
-
Steam
- ST:
-
Steam turbine
- Turb:
-
Turbine
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MOE) (No. 2017R1A2B4006859).
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Dong Hyeok Won received his M.S. degree from the Dept. of Mechanical Engineering, Inha University, in 2019 and is currently working at mechanical engineering team, Samsung Engineering. His research interests include design and analysis of advanced power plant systems.
Min Jae Kim received his Ph.D. degree from the Dept. of Mechanical Engineering, Inha University, in 2019 and is currently researcher at the R&D Center of Doosan Heavy Industries and Construction. His research interests include design and analysis of advanced power plant systems.
Jae Hong Lee received his B.S. degree from the Dept. of Mechanical Engineering, Inha University, in 2015 and is currently a Ph.D. student in the same department. His research interests include performance analysis and diagnosis of gas turbine power plants.
Tong Seop Kim received his Ph.D. degree from Dept. of Mechanical Engineering, Seoul National University in 1995. He has been with Dept. of Mechanical Engineering, Inha University since 2000. His research interests include design, analysis and diagnosis of advanced energy systems including gas/steam turbine based power plants.
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Won, D.H., Kim, M.J., Lee, J.H. et al. Performance characteristics of an integrated power generation system combining gas turbine combined cycle, carbon capture and methanation. J Mech Sci Technol 34, 4333–4344 (2020). https://doi.org/10.1007/s12206-020-0923-8
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DOI: https://doi.org/10.1007/s12206-020-0923-8