CIESC Journal ›› 2019, Vol. 70 ›› Issue (11): 4191-4198.DOI: 10.11949/0438-1157.20190412

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Influence analysis of insulation on performance of single well geothermal heating system

Yunmin RAN1,4(),Xianbiao BU1,2,3()   

  1. 1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
    2. Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
    3. Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, Guangdong, China
    4. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-04-18 Revised:2019-08-29 Online:2019-11-05 Published:2019-11-05
  • Contact: Xianbiao BU

保温对地热单井换热性能的影响分析

冉运敏1,4(),卜宪标1,2,3()   

  1. 1. 中国科学院广州能源研究所,广东 广州 510640
    2. 中国科学院可再生能源重点实验室,广东 广州 510640
    3. 广东省;新能源和可再生能源研究开发与应用重点实验室,广东 广州 510640
    4. 中国科学院大学,北京100049
  • 通讯作者: 卜宪标
  • 作者简介:冉运敏(1996—),女,硕士研究生,ranym@ms.giec.ac.cn
  • 基金资助:
    国家重点研发计划项目(2018YFB1501805);广东省自然科学基金项目(2018A030313018);国家自然科学基金项目(41972314)

Abstract:

The heat transfer mathematical model of single well geothermal is established and the heat transfer process of single well geothermal is simulated. The effects of different insulation materials and depth on the fluid outlet temperature and heating power are compared and analyzed. The results show that the thermal conductivity of insulation material and the depth of the insulation installation have great influence on the heating power of the system. When the thermal conductivity of material are 0.03 W/(m·K) and 0.5 W/(m·K), the average heating power are 732.08 kW and 640.98 kW, respectively. When the thermal conductivity is 0.03 W/(m·K) and the depth of insulation installation is 1000 m, the temperature difference between inlet and outlet is 10.33 K, when the depth of insulation installation is 2000 m, the temperature difference between inlet and outlet is 15.98 K and when the depth of insulation installation is 3000 m, the temperature difference between inlet and outlet is 17.93 K. In the actual project, the production wells can be insulated by means of various materials and installations. The heat preservation focus is on the small depth of the well, which can ensure the production water temperature and save costs.

Key words: geothermal energy, geothermal single well, heat transfer, thermal insulation pipe, numerical simulation, computational fluid dynamics

摘要:

建立了单井地热传热数学模型,模拟了单井地热流动换热过程,比较分析了不同保温材料及保温深度对采出水温度和取热功率的影响。结果表明:保温材料热导率和保温深度对系统取热功率有很大影响。当保温材料热导率为0.03 W/( m·K)和0.5 W/( m·K)时,平均取热功率分别 为732.08 kW和640.98 kW;采用热导率为0.03 W/( m·K)的保温材料,保温深度1000 m时流体进出口温差为10.33 K,保温深度为2000 m时流体进出口温差为15.98 K,保温深度为3000 m 时流体进出口温差为17.93 K。实际工程中,可以采用各种材料组合安装的形式对采出井进行保温,保温重点为井深较小处,这样既能保证采出水温,又能节约成本。

关键词: 地热能, 地热单井, 传热, 保温管, 数值模拟, 计算流体力学

CLC Number: