Post-combustion CO2 capture for coal power plants: a viable solution for decarbonization of the power industry?
- 1 University of Rijeka, Faculty of Engineering, Rijeka, Croatia
This paper investigates the performance of post-combustion carbon capture and storage (PCCS) for pulverized coal-fired power plants. The PCCS units comprises CO2 absorption by 30 wt% monoethanolamine (MEA) solution and CO2 compression at 150 bar for permanent storage or enhanced oil recovery. The specific CO2 emissions per unit of generated electricity is 733 kgCO2/MWh in the reference power plant without PCCS while the power plant with integrated PCCS achieve specific emissions lower than 100 kgCO2/MWh, assuming a carbon capture rate of 90%. However, PCCS technology needs substantial amounts of thermal energy for absorbent regeneration and electricity for carbon capture, CO2 compression as well as for the operation of other parasitic electricity consumers. The PCCS energy requirements vastly affect the overall power plant performance. The reference coal-fired supercritical power plant (without PCCS) achieves a net efficiency of 45.1%. On the other hand, the PCCS integrated power plant achieves a net efficiency of 34.6%, a 10.5%-pts net efficiency loss over the reference scenario, when the PCCS specific energy demand is 3.5 MJth/kgCO2 for absorbent regeneration, 0.35 MJel/kgCO2 for CO2 compression and 0.15 MJel/kgCO2 for carbon capture and cooling water pumps. The corresponding electricity output penalty caused by the PCCS unit is 352 kWhel/kgCO2. PCCS technology shows promising potential for decarbonization of the power industry, but further development is necessary to improve its reliability, cost-effectiveness and to diminish its impact on the power plant performance.
- IEA Statistics: CO2 emissions from fuel combustion, 2019.
- BP Statistical Review of World Energy, London, UK, 2020.
- IEA World Energy Outlook 2020, Paris, France, 2020.
- Global Status of CCS 2020, Global CCS Institute, November 2020, Melbourne, Australia.
- H.C. Mantripragada, H. Zhai, E.S. Rubin: Boundary Dam or Petra Nova: Which is a better model for CCS energy supply? International Journal of Greenhouse Gas Control (2019), 82, 59- 68, https://doi.org/10.1016/j.ijggc.2019.01.004
- E.S. Rubin, J.E. Davison, H.J. Herzog: The cost of CO2 capture and storage, Int. J. of Greenhouse Gas Control (2015), 40, 378- 400, https://doi.org/10.1016/j.ijggc.2015.05.018
- IPCC Special Report on Carbon Dioxide Capture and Storage. Intergovernmental Panel on Climate Change, B. Metz, O. Davidson, H.C. de Coninck, M. Loos, L.A. (eds.), Cambridge University Press, Cambridge, UK; 2005.
- P.H.M. Feron: Absorption-Based Post-Combustion Capture of Carbon Dioxide, Woodhead Publishing: Duxford, UK, 2016.
- B.J: Lee, J.I. Lee, S.Y. Yun, B.G. Hwang, C.S. Lim, Y.K. Park: Methodology to Calculate the CO2 Emission Reduction at the Coal-fired Power Plant: CO2 Capture and Utilization Applying Technology of Mineral Carbonation, Sustainability (2020), 12 (18), 7402, https://doi.org/10.3390/su12187402
- D.Y. Leung, G. Caramanna, M.M. Maroto-Valer: An overview of current status of carbon dioxide capture and storage technologies, Renewable and Sustainable Energy Reviews (2014), 39, 426-443, https://doi.org/10.1016/j.rser.2014.07.093
- B. Tramošljika: Analysis of the Thermal Power Plant Plomin C: Comparison of Gas and Coal Variants, Graduate Thesis, Faculty of Engineering, University of Rijeka: Rijeka, Croatia. 2019
- B. Tramošljika, P. Blecich, I. Bonefačić, V. Glažar: Advanced Ultra-Supercritical Coal-Fired Power Plant with Post- Combustion Carbon Capture: Analysis of Electricity Penalty and CO2 Emission Reduction, Sustainability (2021), 13(2), 801. https://doi.org/10.3390/su13020801