Thermodynamic and thermo-economic analysis of heat pipe-based deep geothermal driven combined heat and power system

李骥飞; 饶建业; 李瑞忠; 郭智琳; 苗政

doi:10.19666/j.rlfd.202411249

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Thermodynamic and thermo-economic analysis of heat pipe-based deep geothermal driven combined heat and power system

Thermal Power Generation Vol. 54, Issue 9, Pages: 135-144(2025)

更新时间：2026-08-11

- Thermodynamic and thermo-economic analysis of heat pipe-based deep geothermal driven combined heat and power system
- 作者机构：
  
  1. 电力规划总院有限公司
  2. 华北电力大学低品位能源多相流与传热北京市重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202411249
  CLC： TM616;TU83;TK52
- Published：2025
- 稿件说明：
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[1]李骥飞,饶建业,李瑞忠,等.热管型深层地热驱动热电联供系统热力学与热经济分析[J],2025,54(09):135-144.
[1]李骥飞,饶建业,李瑞忠,等.热管型深层地热驱动热电联供系统热力学与热经济分析[J],2025,54(09):135-144. DOI： 10.19666/j.rlfd.202411249.

DOI：10.19666/j.rlfd.202411249.

摘要

建立了热管型深层地热驱动热电联供系统分析模型，通过热管-地热岩层数值计算获取热管的动态取热特性，通过耦合直膨式热电联供系统热力学与热经济性能分析，研究了热管结构(热管直径、热管长度、保温层长度)、运行时间和地温梯度对热电联供系统性能的影响规律。结果表明：热管蒸汽冷凝温度越低，热管取热量越大，有助于缩短投资回收期，但冷凝温度的降低会降低热电联供系统热效率，同时，存在最佳蒸汽冷凝温度使得系统平均度电成本最低。热管取热量在前5年下降较快，之后逐渐趋于平稳；为保持系统的长期(30年)稳定取热，避免相邻热管的干扰，每2根热管的中心距离应保持在80m以上，热电联产系统的经济性与热管结构参数密切相关，在适宜蒸汽冷凝温度下，增大热管直径和长度，选择地温梯度较高的靶区可有效降低热电联供系统投资回收期和平均度电成本。

Abstract

An analytical model for a combined heat and power(CHP) system driven by deep geothermal energy based on heat pipes was developed. The dynamic heat extraction characteristics of the heat pipes are obtained through numerical calculations based on the heat pipe-geothermal rock layer model. By analyzing the thermodynamic and thermo-economic performance of the direct expansion CHP system

the effects of heat pipe structure(heat pipe diameter

length

and insulation layer length)

operating time

and geothermal temperature gradient on the performance of the system are investigated. The results show that

lower steam condensation temperature of the heat pipes leads to greater heat extraction

which helps shorten the investment recovery of the system. However

reducing the condensation temperature also decreases thermal efficiency of the CHP system.Moreover

there exists an optimal steam condensation temperature that minimizes the system's levelized cost of electricity(LCOE). The heat extraction rate from the heat pipes declines rapidly in the first five years

and then gradually stabilizes. To maintain stable heat extraction over long term(30 years) and avoid interference between adjacent heat pipes

the center distance between any two heat pipes should be kept above 80 meters. The economic performance of the CHP system is closely related to the structural parameters of the heat pipes. At an optimal steam condensation temperature

increasing the heat pipe diameter and length

and selecting target zones with higher geothermal gradients can effectively reduce both the investment payback period and the LCOE.

关键词

Keywords

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