热储层渗流对中深井地埋管系统换热性能及地层温度恢复的影响  

The influence of thermal reservoir seepage on the heat exchange performance and stratum temperature recovery in medium-deep borehole exchanger systems

作　　者：谷伟 丛培德 李博 马玖辰[2,3] GU Wei;CONG Peide;LI Bo;MA Jiuchen(Tianjin Geothermal Development Corporation,Tianjin 300300,China;Research Center for Efficient Utilization Technology of Geothermal Energy,Tianjin Chengjian University,Tianjin 300384,China;Key Laboratory for Efficient Use of Low and Medium Grade Energy,Ministry of Education of China,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津地热开发有限公司,天津300300 [2]天津城建大学地热高效利用技术研究中心,天津300384 [3]天津大学中低温热能高效利用教育部重点实验室,天津300072

出　　处：《流体机械》2025年第2期65-73,共9页Fluid Machinery

基　　金：国家自然科学基金项目(41402228);天津市自然科学基金企业科技特派员项目(19JCTPJC48100)。

摘　　要：为研究地热水渗流过程对于中深井地埋管的传热特性的影响,建立了井孔内外的非稳态传热模型,采用有限体积法(FVM)对井内外不同区域的瞬态温度进行计算,并与现场试验结果进行对比,以验证所提出的模型和算法的准确性。结果表明,与无地热水渗流工况相比,当热储层厚度为400 m,渗流速度为10×10^(-7) m/s,地埋管的进、出水温差ΔT及平均能效系数E分别提高了5.5℃和16.22%;当渗流速度为10×10^(-7) m/s,热储层厚度由50 m增加至600 m时,供热期平均单位埋深换热量q上升81.92%;热储层厚度为600 m时,间歇期地层温度恢复率达到99.43%;地热水渗流速度和热储层厚度的增加显著提升了中深井地埋管的换热性能和地层温度恢复率。研究结果对中深井地埋管在复杂地质条件下的系统高效运行及实际工程应用提供了理论支撑。In order to investigate the impact of thermal reservoir seepage on the heat transfer characteristics of medium-deep borehole heat exchanger(MDBHE),a transient heat transfer model for both the inside and outside of the borehole was established.The finite volume method(FVM)is employed to calculate the transient temperature in different regions inside and outside the borehole,and the results were compared with field test data to validate the accuracy of the proposed model and algorithm.The results show that compared with the condition without geothermal water seepage,the scenario with a thermal reservoir thickness of 400 m and a seepage velocity of 10×10^(-7) m/s showed an increase of 5.5℃in the temperature differenceΔT between the inlet and outlet of the pipe and a 16.22%improvement in the average energy efficiency coefficient E.Additionally,when the seepage velocity is 10×10^(-7) m/s and the thermal reservoir thickness increases from 50 to 600 m,the average heat transfer power per unit buried depth q during the heating period rises by 81.92%.Furthermore,with a reservoir thickness of 600 m,the stratum temperature recovery rate during intermittent periods reaches 99.43%.The calculations demonstrated that as the thermal reservoir seepage velocity and the thickness of the thermal reservoir increase,there is a corresponding enhancement in the heat exchange performance of the MDBHE and in the temperature recovery rate of the stratum.These findings provide theoretical support for the efficient operation and practical engineering application of MDBHE in complex geological conditions.

关 键 词：中深井地埋管 富水型热储层 传热 数值计算 渗流过程 换热性能 

分 类 号：TK52[动力工程及工程热物理—热能工程]