煤炭工程 ›› 2023, Vol. 55 ›› Issue (2): 164-170.doi: 10.11799/ce202302029

• 研究探讨 • 上一篇    下一篇

隔热内管对中深层地热井同轴换热器换热性能的影响

杜丁山,赵永哲,胡振阳,等   

  1. 1. 中煤科工西安研究院(集团)有限公司
    2. 中煤科工集团西安研究院有限公司
  • 收稿日期:2022-10-14 修回日期:2022-11-09 出版日期:2023-02-20 发布日期:2023-03-27
  • 通讯作者: 赵永哲 E-mail:zhaoyongzhe@cctegxian.com

Effect of insulated inner tube on performance of coaxial heat exchanger in medium-deep geothermal well

  • Received:2022-10-14 Revised:2022-11-09 Online:2023-02-20 Published:2023-03-27

摘要: 中深层地热井同轴换热器作为地下换热系统的重要组成部分,其性能优劣直接决定了地热能开发效率和取热效果。通过现场试验和数值模拟,研究了隔热内管与中深层地热井同轴换热器换热性能的关系并分析了内管隔热长度和隔热方案对同轴换热器出水温度和取热功率的影响。结果表明,将导热系数为0.06W/(m·K)的真空气凝胶隔热钢管作为内管时,同轴换热器短期取热功率为1506.83kW。对于3500m深的地热井,内管隔热性能要求随井深增加而降低,0~1400m段的隔热性能对整体换热效果影响较大,增大管内流量可减小内管有效隔热长度。

关键词: 地热资源研发, 中深层地热能, 同轴换热器, 隔热内管, 取热效果

Abstract: Abstract: As an important component of the underground heat exchange system, the performance of the coaxial heat exchanger in medium-deep geothermal wells directly determines the efficiency of geothermal energy development and heat extraction effect. In this paper, the relationship between the heat-insulating inner tube and the heat transfer performance of coaxial heat exchanger in medium-deep geothermal wells is investigated through field tests and numerical simulations, and the effects of the length of the inner tube insulation and the insulation scheme on the water temperature and heat extraction power of the coaxial heat exchanger are analyzed. The results show that the short-term heat extraction power of the coaxial heat exchanger is 1506.83 kW when a real aerogel insulated tube with a thermal conductivity of 0.06 W/(m·K) is used as the inner tube, and for a geothermal well of 3500 m depth, the thermal insulation performance of the inner tube decreases with increasing depth, and the thermal insulation performance of the 0~1400 m section has a greater influence on the overall heat transfer effect. Increasing the flow rate in the tube can reduce the effective insulation length of the inner tube. The results of the study can be used as a reference for the efficient development and utilization of medium and deep geothermal energy and the optimal design of coaxial heat exchangers.

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