Thermodynamic Analysis of Energy Conversion Systems of CO2-based EGS
With an expanding economy and increased electrification of our society, China is concerned about its long term energy supply. Enhanced geothermal resources (EGS) have an enormous potential for supplying electricity extracting and utilizing the earth’s stored thermal energy. Most attempts to develop EGS have used water as the heat transmission fluid. However CO2 has certain physical and chemical properties that are advantageous for EGS systems, so CO2 can be instead of water as the heat transmission fluid; which would also provide geologic sequestration of CO2 as an ancillary benefit. This paper presents a series of CO2-based energy conversion systems designed for the temperatures and pressures of EGS reservoirs. However the thermal efficiencies of the CO2-based EGS power cycles are less than that of water-based EGS cycles. The thermal efficient of CO2-based EGS is improved with a combined cycle that makes full use of the thermal energy. The total thermal efficiency of the combined cycles is then increased to greater than that of water-based EGS for identical conditions.
CO2-based EGS energy conversion system combined cycle
Fuzhen Zhang Peixue Jiang
Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education and Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084,China
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-4
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）