Influences of climatic environment on the geothermal power generation potential
Influences of climatic environment on the geothermal power generation potential
复制标题
DOI：
10.1016/j.enconman.2022.115980
复制
发表时间：
2022-09
影响因子：
10.4
通讯作者：
Jian Li;Zhen Yang;Zitao Yu;Jun Shen;Yu Duan
中科院分区：
文献类型：
--
作者：
Jian Li;Zhen Yang;Zitao Yu;Jun Shen;Yu Duan
地热发电具有连续性好、受天气影响小、源储量大等优点，具有很好的应用前景。然而，气候环境对发电潜力的影响研究较少，特别是纬度范围广，评价维度多，研究结果模糊。本研究以有机朗肯循环（ORC）作为发电系统，选取6个不同气候环境的城市作为分析点。定量评价了气候环境对系统性能的影响，揭示了影响发电潜力的关键因素。进行了非设计分析，以获得真实的年度运行性能。结果表明，冷却方式是决定地热发电潜力的关键因素，水冷方式具有较好的热力经济性和经济性。在地热温度较低时，水冷方式的比较优势更为突出。环境温度越低，地热发电潜力不一定越好，因为环境温度低于0℃时，需要采用风冷方式，热力性能和经济性能变差。提高风冷系统的性能可以大大提高热经济性能，但风冷与水冷方式的对比结果不会逆转。降低冷却系统和汽轮机的成本分别是提高风冷和水冷方式热经济性能的关键。非设计分析是评估发电潜力的必要手段，尤其是风冷发电模式。仅评估设计条件性能可能低估实际发电量7.6%。
Geothermal power generation has wonderful application prospects due to good continuity, little influence by weather, and large source reserves. However, the influences of climatic environment on power generation potential are vague due to few studies, especially for wide latitude range and multiple evaluation dimensions. This work takes organic Rankine cycle (ORC) as the power generation system and selects six cities in different kinds of climatic environments as analysis sites. Quantitative impacts of climatic environment on system performance were evaluated to reveal the key factor affecting the power generation potential. Off-design analysis was carried out to obtain real annual operating performance. Results show that the cooling mode is the key factor determining geothermal power generation potential, and the water-cooling mode is preferred with better thermodynamic and economic performance. The comparative advantage of water-cooling mode is more prominent at the low geothermal temperature. The geothermal power generation potential is not necessarily better with decreasing ambient temperature because it needs to adopt air-cooling mode for ambient temperature below 0 °C, worsening thermodynamic and economic performance. Improving performance of air-cooling system can substantially enhance thermo-economic performance, but the comparison results between air-cooling and water-cooling modes will not be reversed. Reducing the costs of cooling system and turbine are key points of enhancing thermo-economic performance for air-cooling and water-cooling modes, respectively. Off-design analysis is necessary for evaluating power generation potential, especially for air-cooling mode. Only evaluating design-condition performance may underestimate the actual power generation by 7.6%.