Performance Evaluation of a Hybrid Solar-geothermal Power Generation System

被引：0
作者：
Liu Q. [1 ]
Zhang E. [2 ]
He J. [2 ]
Duan Y. [3 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum Beijing, Changping District, Beijing
[2] State Key Laboratory of Clean Energy Utilization (Zhejiang University), Zhejiang Province, Hangzhou
[3] Key Laboratory of Thermal Science and Power Engineering of MOE (Tsinghua University), Haidian District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 06期
基金：
中国国家自然科学基金;
关键词：
geothermal energy; hybrid power generation system; operation strategy; solar energy; thermodynamic performance;
D O I：
10.13334/j.0258-8013.pcsee.222065
中图分类号：
学科分类号：
摘要：
A hybrid power generation system is a key measure to utilizing renewable energies efficiently. The matching characteristics of the energy flows are the basis for improving stability and efficiency of a hybrid power generation system. A hybrid solar-geothermal power generation system is proposed for the Tibetan region in this work. The steam turbine is driven by high pressure steam generated by solar energy and saturated steam separated from geothermal fluid. And the organic Rankine cycle is driven by low temperature saturated geothermal water. The thermodynamic model of the system is constructed, the thermal performance of the system under the design conditions is analyzed, and the influence of geothermal water temperature, mass flow rate and direct normal irradiance (DNI) on the system performance is explored. The system operation strategy under all operating conditions is proposed, and the thermal performance of the system in different periods of typical days is discussed. The results show that the net output power and thermal efficiency of the system is increased with the increase of DNI, but the system efficiency is decreased. The thermal efficiency of the system for the design condition is 14.66% and the exergy efficiency is 27.52%. The maximum exergy losses occur in the solar collector accounting for 45.4% of the exergy input. During the typical daily heat storage period in summer and autumn, the load factors of high and low pressure steam turbines are higher than 0.94 and 0.95, respectively. When the system is only driven by geothermal energy, the thermal efficiency is decreased to 12.08%. This work can provide reference for the design and operation of hybrid solar- geothermal power generation systems. ©2023 Chin.Soc.for Elec.Eng.
引用
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页码：2109 / 2118
页数：9
相关论文
共 27 条
  • [1] BP．bp Statistical review of world energy
  • [2] China Energy Media New Strategy Institute for Energy Security．China energy big data report(2022)
  • [3] CHEN Biao, DUAN Liqiang, YANG Libo, Performance comparative study of SOFC-MGT-CCHP system coupled with solar energy under different operating strategies [J], Proceedings of the CSEE, 42, 11, pp. 4079-4089, (2022)
  • [4] ZHANG Zhigang, KANG Chongqing, Challenges and prospects for constructing the new-type power system towards a carbon neutrality future[J], Proceedings of the CSEE, 42, 8, pp. 2806-2818, (2022)
  • [5] Hao LI, ZHONG Shengyuan, WANG Yongzhen, Optimization method on the distributed energy system based on energy and information coupled[J], Proceedings of the CSEE, 40, 17, pp. 5467-5475, (2020)
  • [6] List of national electric power industry statistics in 2020[R]
  • [7] HOU Jianchao, CAO Mengchao, Pingkuo LIU, Development and utilization of geothermal energy in China ： current practices and future strategies[J], Renewable Energy, 125, pp. 401-412, (2018)
  • [8] MENG Dongyu, Qiang LIU, JI Zhongli, Performance analyses of regenerative organic flash cycles for geothermal power generation[J], Energy Conversion and Management, 224, (2020)
  • [9] LIU Qiang, WAN Xu, DUAN Yuanyuan, Effect of injection parameters on thermodynamic performance of an enhanced geothermal system(EGS) using supercritical CO<sub>2</sub> cycle[J], Proceedings of the CSEE, 42, 21, pp. 7884-7892, (2022)
  • [10] Jian LI, WU Jiangyuan, YANG Zhen, Review of geothermal power generation technologies and key influencing factors[J], Thermal Power Generation, 51, 3, pp. 1-8, (2022)
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