Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers
Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers
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DOI：
10.3390/su13126918
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发表时间：
2021-06
期刊：
影响因子：
3.9
通讯作者：
T. Renaud;L. Pan;H. Doran;G. Falcone;P. G. Verdin
中科院分区：
文献类型：
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作者：
T. Renaud;L. Pan;H. Doran;G. Falcone;P. G. Verdin
地热能是一种可靠和成熟的能源，但在可再生能源组合中所占比例不到1%。虽然增强型地热系统(EGS)的概念面临技术验证挑战，并受到公众接受问题的困扰，但非常规深井设计的开发可以帮助提高其效率和可靠性。对单EGS井设计进行建模是评估其长期热性能的关键，特别是在非常规地质环境下。用T2WELL/EOS1程序得到的数值结果与已有的深孔换热器的实验数据进行了验证，该换热器在1962m深度测得的温度为358∘C，基于校准的模型，比较了两种石墨强化导热换热器在高地温梯度下的热性能。分析强调了回收不同比例的蒸气的潜力。与常规油井相比，与常规油井相比，沿着油井使用的石墨似乎是最合适的解决方案，可以将热输出提高5%至8%。用单井和双井DBHE研究了这种井在纽伯里火山区的理论实现。这些发现为评估当前地热实践的替代工程解决方案提供了一种强有力的方法。
Geothermal energy is a reliable and mature energy source, but it represents less than 1% of the total renewable energy mix. While the enhanced geothermal system (EGS) concept faces technical validation challenges and suffers from public acceptance issues, the development of unconventional deep-well designs can help to improve their efficiency and reliability. Modelling single-EGS-well designs is key to assessing their long-term thermal performances, particularly in unconventional geological settings. Numerical results obtained with the T2WELL/EOS1 code have been validated with available experimental data from a deep borehole heat exchanger (DBHE), where a temperature of 358 ∘C has been measured at a depth of 1962 m. Based on a calibrated model, the thermal performances of two enhanced thermal conductive DBHEs with graphite were compared for high geothermal gradients. The analysis highlights the potential recovery of a variable fraction of vapour. Graphite used along the well appears to be the most suitable solution to enhance the thermal output by 5 to 8% when compared to conventional wells. The theoretical implementation of such well in the Newberry volcano field was investigated with a single and doublet DBHE. The findings provide a robust methodology to assess alternative engineering solutions to current geothermal practices.