中深层同轴地埋管换热器井下换热关键参数及影响规律分析  

Analysis of Key Parameters and Influence Law of Downhole Heat Transfer in Medium-depth Coaxial Buried Tube Heat Exchangers

作　　者：刘成路 胡振阳 赵永哲 苟立 LIU Cheng-lu;HU Zhen-yang;ZHAO Yong-zhe;GOU Li(CCTEG Xi'an Research Institute(Group)Co.,Ltd.,Xi'an 710065,China;Xi'an Coal Science Geothermal Energy Development Co.,Ltd.,Xi'an 710086,China)

机构地区：[1]中煤科工西安研究院(集团)有限公司,西安710065 [2]西安煤科地热能开发有限公司,西安710086

出　　处：《科学技术与工程》2025年第8期3134-3141,共8页Science Technology and Engineering

基　　金：中煤科工西安研究院(集团)有限公司科技创新基金(2022XAYJS03)。

摘　　要：为探明中深层同轴地埋管换热器的高效换热特性,基于流体流动传热方程,构建中深层同轴地埋管换热器与周围岩土体的传热模型,应用COMSOL软件进行换热数值分析与计算,研究该模型在不同埋深、内管导热系数、循环水流量、固井材料导热系数条件下名义取热量的变化情况。结果表明:内管导热系数、循环水流量及固井材料导热系数对名义取热量影响较大;内管导热系数从0.5 W/(m·K)降至0.002 W/(m·K),名义取热量增幅为289.4%;循环水流量从20 m^(2)/h升至45 m~2/h,名义取热量增幅为124%;固井材料导热系数从0.8 W/(m·K)升至1.8 W/(m·K),名义取热量增幅为2%。最后依托中煤科工西安研究院(集团)有限公司中深层地热能建筑供热试点示范项目,对该项目连续运行(168 h)工况下实验与模拟数据进行差异化分析。研究成果对中深层同轴地埋管换热器优化设计及中深层地热井高效开发利用具有一定的指导意义。In order to explore the efficient heat transfer characteristics of medium-deep coaxial buried pipe heat exchangers,a heat transfer model was constructed between the medium-deep coaxial buried pipe heat exchanger and surrounding rock and soil based on the fluid flow heat transfer equation.COMSOL software was used for numerical analysis and calculation of heat transfer,and the nominal heat transfer of the model was studied under different burial depths,inner pipe thermal conductivity,circulating water flow rate,and cementing material thermal conductivity conditions.The research results indicate that the thermal conductivity of the inner pipe,the flow rate of circulating water,and the thermal conductivity of the cementing material have a significant impact on the nominal heat extraction.The thermal conductivity of the inner tube decreases from 0.5 W/(m·K)to 0.002 W/(m·K),with a nominal increase in nominal heat extraction of 289.4%.The circulating water flow rate from^(2)0 m^(2)/h rises to 45 m^(2)/h,with a nominal increase in nominal heat extraction of 124%.The thermal conductivity of cementing materials increases from 0.8 W/(m·K)to 1.8 W/(m·K),with a nominal increase in heat extraction of 2%.Finally,relying on a Pilot Demonstration Project of Medium and Deep Geothermal Energy for Building Heating at CCTEG Xi an Research Institute(Group)Co.,Ltd.,differential analysis was conducted on experimental and simulation data under continuous operation for 168 h of the project.The research results have certain guiding significance for the optimization design of medium-deep coaxial buried pipe heat exchangers and the efficient development and utilization of medium-deep geothermal wells.

关 键 词：中深层同轴地埋管换热器 高效换热 流体传热模型 名义取热量 

分 类 号：P967[天文地球—自然地理学]