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Performance and economic assessments of integrating geothermal energy into coal-fired power plant with CO2 capture
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2017 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 119, 278-287 p.Article in journal (Refereed) Published
Abstract [en]

A novel carbon capture and storage system integrated with geothermal energy was proposed to reduce energy consumption in the post-combustion CO2 capture (PCC) process. Geothermal energy at medium temperature was used to provide the heat required for solvent regeneration. A technical and economic assessment was conducted based on a 300 MWe coal-fired power plant. Additionally, the integrated system was also compared with a stand-alone geothermal power (GP) plant to evaluate individual advantages. Both an enhanced geothermal system (EGS) and a hot sedimentary aquifer (HSA) reservoir were selected to identify the effect of geological properties and heat characteristics on system performance. The results indicated that the geothermal-assisted post-combustion CO2 capture (GPCC) plant exhibited better performance than the PCC plant. The net plant average efficiency increased 5.56% and 4.42% in the EGS scenario and HSA scenario, respectively. Furthermore, the net incremental geothermal efficiency obtained corresponded to 21.34% and 20.35% in the EGS scenario and HSA scenario, respectively. The economic assessment indicated that the GPCC systems in both the EGS scenario and HSA scenario had lower marginal cost of electricity (70.84 $/MWh and 101.06 $/MWh) when compared with that of the stand-alone GP systems (151.09 $/MWh and 101.95 $/MWh). 

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 119, 278-287 p.
Keyword [en]
CO2 capture, Cost, Geothermal energy, Geothermal power plant, Renewable energy
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-202218DOI: 10.1016/j.energy.2016.12.029ISI: 000393727800025Scopus ID: 2-s2.0-85008225243OAI: oai:DiVA.org:kth-202218DiVA: diva2:1083028
Note

Correspondence Address: Zhao, J.; Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, Ministry of Education of ChinaChina; email: zhaojun@tju.edu.cn. QC 20170320

Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2017-11-29Bibliographically approved

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Yan, Jinyue

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