Geothermal and Solar Energy Combined Power Generation System—An Environment Friendly System Insubject to Geographic Location
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摘要: 为解决能源问题, 开发可再生能源, 利用闭式循环将地热系统和太阳能系统联合起来发电.发电系统可以避免因大规模开发利用地热水资源可能造成的地震、地面沉降、地热水资源衰减、地热水有害成分污染、热污染等环境问题, 也可以克服地热发电和太阳能发电受地理位置限制的缺点.地热系统地下部分由两垂深3~5 km的井在井底由一5~7 km的水平井连接而成, 水平井中流体温度可达150 ℃左右, 适合于ORC发电.太阳能系统采用槽式聚光镜集热, 集热流体可选水或油, 最高温度可达350 ℃以上.ORC一级循环工质为水, 二级循环工质为异丁烷; ORC发电效率, 白天最大为20%, 晚上最大为12%.系统采用化学储能, 储能密度为显热储能和潜热储能的10倍以上.钻井和完井、太阳能热能转换、载热流体、ORC和储能等技术的研究结果证明该系统是可行的.Abstract: The utilization of closed loop, which generates power by combining the geothermal system with solar energy system, is feasible to solve energetic problem and to exploit renewable energy. The power generation system can avoid such environmental problems as earthquake, heat pollution, ground sedimentation, decrease of geothermal water resources, toxicant pollution, caused by mass use of geothermal water resources. Moreover, the system is expected to be free of the limitation of the geographic location. The technology is to generate power by taking the advantage of the closed loop which combines the geothermal system with solar energy system. The geothermal system is suitable for ORC power generation since the vertical depth of the underground part is 3-5 km, horizontal distance is around 5-7 km, and the fluid temperature in the horizontal well comes to around 150 ℃. Trough paraboloid mirror is used in the solar energy system to collect heat in which either water or oil is feasible as heat collecting fluid, and it is possible for temperature to reach as high as or even higher than 350 ℃. Primary circulation media is water and the secondary one is isobutane. The maximal power generation productivity of ORC is 20% in the daytime and 12% at night. Chemical storage energy is adopted in the system which has a storage-density 10 times higher than the apparent-heat storage energy and the potential-heat one. The system is proved to be feasible after studying the relative technologies of drilling and completion, the transformation from solar energy to heat energy, heat-carrier fluid, ORC and storage energy.
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Key words:
- solar energy /
- geothermal energy /
- closed loop /
- combined power generation
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图 1 地热和太阳能联合发电系统工作原理简图
Fig. 1. Concise chart of working principle of geothermal and solar energy combined power generation system
图 3 载热流体温度、流量与ORC功率关系
Fig. 3. Relationship among the temperate, the flux of fluid and the power of ORC
表 1 钻孔直径和所能钻达的最大水平位移的关系
Table 1. Relationship between the diameter of drilling hole and the maximal drilling horizontal distance
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