Calcium looping with supercritical CO2 cycle for decarbonisation of coal-fired power plant

Dawid P. Hanak and Vasilije Manovic

Energy, 2016, vol. 102, issue C, 343-353

Abstract: State-of-the-art integration scenarios of calcium looping (CaL), which is an emerging CO2 capture technology, assume that excess heat is used to raise steam for the steam cycle and result in a net efficiency penalty of 6.0–8.0% points. In this study, a concept using the supercritical CO2 cycle (s-CO2) instead of the conventional steam cycle is proposed. Retrofit of CaL with recompression s-CO2 cycle to the 580 MWel coal-fired power plant was found to result in a net efficiency penalty of 6.9%HHV points. This is 1%HHV point lower than that for the same system linked with the steam cycle having the same turbine inlet conditions (593.3 °C/242.3 bar). A further reduction of the net efficiency penalty to 5.8%HHV points was achieved through considering a pump instead of a first CO2 compression stage and increasing the turbine inlet temperature to 620 °C and pressure to 300 bar. As the s-CO2 cycle's specific capital cost is up to 27% lower than that of the equivalent steam cycle, CaL with s-CO2 cycle is a viable option for the coal-fired power plant decarbonisation. Moreover, it can be expected that this cycle can be successfully implemented in other high-temperature looping cycles, such as chemical looping combustion.

Keywords: Calcium looping; Carbon capture; Coal-fired power plant; Supercritical CO2 cycle; Recompression Brayton cycle; Efficiency penalty reduction (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (18)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:102:y:2016:i:c:p:343-353

DOI: 10.1016/j.energy.2016.02.079

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