Thermodynamic Performance Analysis of Medium and Deep Geothermal Energy Coaxial Tube Heat Exchanger Energy Storage and Power Generation System

LING Lanning; YAO Erren; SUN Hao; LI Ruixiong; ZOU Hansen; WANG Huanran; XI Guang; ZHANG Sunxiao

doi:10.7652/xjtuxb202401012

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Thermodynamic Performance Analysis of Medium and Deep Geothermal Energy Coaxial Tube Heat Exchanger Energy Storage and Power Generation System

更新时间：2025-05-13

- Thermodynamic Performance Analysis of Medium and Deep Geothermal Energy Coaxial Tube Heat Exchanger Energy Storage and Power Generation System
- Vol. 58, Issue 1, Pages: 126-137(2024)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 长安大学建筑工程学院,西安,710061
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202401012
  CLC： TK02
- Online First：10 January 2024，
  
  Published：2024
- 稿件说明：
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LING Lanning, YAO Erren, SUN Hao, et al. Thermodynamic Performance Analysis of Medium and Deep Geothermal Energy Coaxial Tube Heat Exchanger Energy Storage and Power Generation System[J]. 2024, 58(1): 126-137.
DOI：

LING Lanning, YAO Erren, SUN Hao, et al. Thermodynamic Performance Analysis of Medium and Deep Geothermal Energy Coaxial Tube Heat Exchanger Energy Storage and Power Generation System[J]. 2024, 58(1): 126-137. DOI： 10.7652/xjtuxb202401012.

摘要

针对地热能发电技术效率低、稳定性差的问题

提出一种兼具同轴套管取热技术和压缩空气储能技术特点的中深层地热能同轴套管换热器储能发电系统

通过建立系统的热力学模型

研究了典型工况下系统关键参数和热力学性能的演化规律

揭示了不同运行特征下地热恢复与提取的动态机制。研究结果表明:储能发电系统的运行分为非稳定循环和稳定循环阶段

在非稳定循环阶段中

热提取量和膨胀机输出功随循环次数的增加而增加

而热补偿量和系统效率呈相反趋势变化; 当热提取量、热补偿量和地热消耗量达到平衡时

储能发电系统从第8次循环进入稳定循环阶段

稳定循环中各参数不随循环次数改变

单次循环输出电量为47 956.7 kW·h

系统效率达到63.5%; 通过提升压缩机压比和补热水流量可以提升地热恢复温度:当压缩机压比由6提升至7时

深度为1 300 m、半径为0.116 m处

岩土温度多提升4.3 ℃

当补热水流量由4.5 m

/h提升至6 m

同一处岩土温度多提升6.4 ℃

该研究为提高地热能发电效率和稳定性提供了新方案。

Abstract

This study presents a solution to address the efficiency and stability issues in geothermal energy power generation technology. A medium and deep geothermal energy coaxial tube heat exchanger energy storage and power generation system is proposed that integrates coaxial tube heat extraction technology with compressed air energy storage technology. By developing a thermodynamic model of the system

the evolution of key parameters and thermodynamic performance under typical operating conditions is analyzed

and the dynamic mechanism of geothermal recovery and extraction under differ

ent operating characteristics is examined. The results show that the operation of energy storage and generation system is divided into two phases: unstable cycle and stable cycle phase. In the unstable cycle phase

the heat extraction amount and expander output work increase with the number of cycles

while the heat compensation amount and the system efficiency exhibit the opposite trend. Once a balance is reached between heat extraction

heat compensation and geothermal consumption reach equilibrium

the system enters a stable cycle from the 8th cycle onwards. In this phase

the system parameters remain constant regardless of the number of cycles

and the output of a single cycle is measured at 47 956.7 kW·h

with a system efficiency as high as 63.5%. To increase the geothermal recovery temperature

the compressor pressure ratio and the flow rate of water for heat compensation can be adjusted. When the compressor pressure ratio is increased from 6 to 7

the geotechnical temperature at a depth of 1 300 m and a radius of 0.116 m is increased by 4.3 ℃

and flow rate of water for heat compensation is increased from 4.5 to 6 m

the temperature at the same site is increased by 6.4 ℃. This study provides a promising approach to improve the efficiency and stability of geothermal energy generation.

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