紧邻的双井中深层套管式地埋管换热器换热特性研究  

Study on heat transfer characteristics of deep casing buried pipe heat exchanger in adjacent double wells

作　　者：马娟[1] 董娟[1] 刘勇[1] 沙占军 Ma Juan;Dong Juan;Liu Yong;Sha Zhanjun(Yinchuan University of Energy,Yinchuan 750105,China)

机构地区：[1]银川能源学院,宁夏银川750105

出　　处：《可再生能源》2022年第12期1604-1612,共9页Renewable Energy Resources

基　　金：宁夏高等学校科学研究项目(NGY2020123)。

摘　　要：目前中深层地热能受到了广泛的关注,文章基于有限差分法建立双管中深层换热器数值模型,并通过FLUENT软件对模型进行校验。利用双管模型研究了埋管间距、岩土热物性等因素对双管换热器换热性能的影响。计算结果表明:增大埋管间距可以有效缓解地下岩土冷量堆积的现象,埋管间距较小时,埋管中心点处温度更低;当埋管间距大于50 m时,双管换热器的换热特性与单管近似;当埋管深度增加时,可以适当减小埋管间距;岩土导热系数较大时,需要加大埋管间距;岩土体积比热对换热器影响较大,实际工程中需要根据岩土体积比热大小调整埋管间距。At present,middle and deep geothermal energy has attracted extensive attention.In this paper,the numerical model of double tube middle and deep heat exchanger is established based on the finite difference method,and the model is verified by FLUENT software.The effects of buried pipe spacing and geotechnical thermophysical properties on the heat transfer performance of double pipe heat exchanger are studied by using double pipe model.The calculation results show that increasing the buried pipe spacing can effectively alleviate the phenomenon of underground rock and soil cooling accumulation.When the buried pipe spacing is small,the temperature at the center of the buried pipe is lower;When the distance between buried tubes is more than 50 m,the heat transfer characteristics of double tube heat exchanger are similar to that of single tube;When the buried pipe depth becomes deeper,the buried pipe spacing can be appropriately reduced,and the geotechnical thermal conductivity is large,the buried pipe spacing needs to be increased;The heat capacity of rock and soil has a great impact on the heat exchanger.In practical engineering,the buried pipe spacing needs to be adjusted according to the heat capacity of rock and soil.

关 键 词：中深层 数值模拟 双管换热器 换热器性能 

分 类 号：TK521[动力工程及工程热物理—热能工程]