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2022年, 第16卷 第2期 (Xingchao WANG, Chunjian PAN, Carlos E. ROMERO, et al. p246–262)
CO2 capture and sequestration in deep saline aquifers is widely considered to be a leading option for controlling greenhouse gas emissions. One such possibility involves injection of supercritical carbon dioxide (sCO2) into a high-permeability geothermal reservoir. In addition to the benefit of sequestering the CO2 captured from fossil-fired power plants in reservoirs, the CO2 can be used to mine geothermal heat for utilization above ground. This study presents the capability to obtain desirable sCO2 production flow rates, temperatures and pressures for power generations in a fully coupled geothermal wellbores and reservoir system. Furthermore, a power cost analysis and optimization methodology has been developed combining of thermodynamic performance and system cost both for the geothermal heat mining system and power generation system. The power cost considered in this study is levelized cost of electricity (LCOE) in USD per kilowatt-hour ($/kWh) over the plant life. This cost estimation and optimization methodology has been applied to obtain the most cost-effective power generation system design with considering the geothermal energy extraction system, including optimal well size, well distances as well as CO2 injection flow rate, all of which s also significantly affect the system thermodynamic performance. Accordingly, the most cost-effective design with the minimal LCOE of 0.177 $/kWh was achieved for a 20-year steady operation without considering CO2 sequestration credit through the global optimization. Furthermore, the benefit from CO2 sequestration is emphasized in this study.[展开] ...
ISSN 2095-1701 (Print) ISSN 2095-1698 (Online)
CN 11-6017/TK
Postal Subscription Code 80-972 原刊名 Frontiers of Energy and Power Engineering in China 2018 Impact Factor: 1.701