High-efficiency negative-carbon emission power generation from integrated solid-oxide fuel cell and calciner

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Applied Energy, ISSN: 0306-2619, Vol: 205, Page: 1189-1201

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Dawid P. Hanak, Barrie G. Jenkins, Tim Kruger, Vasilije Manovic
Elsevier BV
Engineering, Energy, Environmental Science
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Direct air capture of CO 2 has the potential to help meet the ambitious environmental targets established by the Paris Agreement. This study assessed the techno-economic feasibility of a process for simultaneous power generation and CO 2 removal from the air using solid sorbents. The process uses a solid-oxide fuel cell to convert the chemical energy of fuel to electricity and high-grade heat, the latter of which can be utilised to calcine a carbonate material that, in turn, can remove CO 2 from the air. The proposed process was shown to operate with a net thermal efficiency of 43.7–47.7% LHV and to have the potential to remove 463.5–882.3 gCO 2 /kW el h, depending on the fresh material used in the calciner. Importantly, the estimated capital cost of the proposed process (1397.9–1740.5 £/kW el,gross ) was found to be lower than that for other low-carbon emission power generation systems using fossil fuels. The proposed process was also shown to achieve a levelised cost of electricity of 50 £/MW el h, which is competitive with other low-carbon power generation technologies, for a carbon tax varying between 39.2 and 74.9 £/tCO 2. Such figure associated with the levelised cost of CO 2 capture from air is lower than for other direct air concepts.

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