GIEC OpenIR  > 中国科学院广州能源研究所
Alternative TitleMining Hot Dry Rock Geothermal Energy by Heat Pipe: Conceptual Design and Technical Feasibility Study
蒋方明1,2,3; 黄文博1,2,3,4; 曹文炅1,2,3
Source Publication新能源进展
Other AbstractIn conventional enhanced geothermal systems (EGS), heat is extracted from earth-deep by circulating fluid through fractured-rock heat reservoir. This process generally consumes large amount of pump work, and has problems like fluid loss and pipe scaling etc. Moreover, it often encounters failure due to the bad downhole connectivity of fracture network in the reservoir. To circumvent these problems, conceptual design about mining heat from earth-deep hot dry rock by heat pipe is presented for the first time. Hoping to have strong natural convection of CO2 in the reservoir to enhance the heat transfer between rock and heat pipe, filling the reservoir with CO2 fluid is specially proposed. Further, numerical modeling and theoretical analysis are performed to explore the technical feasibility of the new HDR heat extraction concept. The numerical model considers CO2 of temperature- and pressure- dependent thermophysical properties. Effects of natural convection of CO2 in the target reservoir on the heat extraction by heat pipe are studied; heat extraction rates by different conditioned heat pipes are compared. The results indicate that lowering the working temperature of heat pipe can significantly increase the heat extraction rate and notable increase at the heat extraction rate will be caused by the natural convection of CO2 if the reservoir permeability is higher than 1 × 10 9 m2. It is found from numerical results also that an increase of 1.5 - 3 times at the heat extraction rate can be achieved if the heating section of the heat pipe is arranged horizontally compared to all vertically aligned heat pipe. Additionally, the carrying limit and steam flow resistance for water thermosyphon are analyzed numerically under realistic geothermal conditions.
Keyword热管 干热岩 增强型地热系统 超临界CO2 深层地热 heat pipe hot dry rock enhanced geothermal system supercritical CO2 earth-deep geothermal energy
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Document Type期刊论文
Corresponding Author蒋方明
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
蒋方明,黄文博,曹文炅. 干热岩热能的热管开采方案及其技术可行性研究[J]. 新能源进展,2017,5(6):426-434.
APA 蒋方明,黄文博,&曹文炅.(2017).干热岩热能的热管开采方案及其技术可行性研究.新能源进展,5(6),426-434.
MLA 蒋方明,et al."干热岩热能的热管开采方案及其技术可行性研究".新能源进展 5.6(2017):426-434.
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