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

Yunmin RAN; Xianbiao BU

doi:10.11949/0438-1157.20190412

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

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Influence analysis of insulation on performance of single well geothermal heating system
- CIESC Journal Vol. 70, Issue 11, Pages: 4191-4198(2019)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190412
  CLC： TK 529
- Received：18 April 2019，
  
  Revised：2019-08-29，
  
  Published：05 November 2019
- 稿件说明：
移动端阅览
冉运敏, 卜宪标. 保温对地热单井换热性能的影响分析[J]. 化工学报, 2019, 70(11): 4191-4198

RAN Yunmin, BU Xianbiao. Influence analysis of insulation on performance of single well geothermal heating system[J]. CIESC Journal, 2019, 70(11): 4191-4198
冉运敏, 卜宪标. 保温对地热单井换热性能的影响分析[J]. 化工学报, 2019, 70(11): 4191-4198 DOI： 10.11949/0438-1157.20190412.

RAN Yunmin, BU Xianbiao. Influence analysis of insulation on performance of single well geothermal heating system[J]. CIESC Journal, 2019, 70(11): 4191-4198 DOI： 10.11949/0438-1157.20190412.

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。

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.

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