岩石地层条件下回填料对地埋孔换热能力的影响  

Influence of Backfilling Materials on the Heat Transfer Capacity of Buried Hole under the Lithostraligraphic Condition

作　　者：贾子龙[1] 郑佳[1] 郭艳春[1] 李娟[1] 刘爱华[1] 刘冰 JIA Zilong;ZHENG Jia;GUO Yanchun;LI Juan;LIU Aihua;LIU Bing(Beijing Geothermal Research Institute,Beijing 102218)

机构地区：[1]北京市地热研究院,北京102218

出　　处：《城市地质》2020年第4期410-414,共5页Urban Geology

基　　金：北京市山区浅层地温能供暖模式研究(PXM2019_158309_000008)。

摘　　要：在北京平谷山区岩石地层条件下,开展了中粗砂、水泥砂浆、重晶石粉3种回填材料地埋孔换热能力影响的相关实验。首先,对这3种回填料进行实验室热物性参数测试,取得回填料的导热系数。其次,换热孔成孔后分别用这3种回填料进行回填,待换热孔稳定后,开展现场热响应测试,取得3眼换热孔的换热量。最后,在系统建设阶段,设置3眼换热孔的单孔监测,待系统正常运转后,对监测数据进行分析,计算单孔的换热量。经过一系列试验分析得出,水泥砂浆和重晶石粉的导热率高于中粗砂,采用水泥砂浆和重晶石粉回填的换热孔换热量明显高于采用中粗砂回填的换热孔。试验结果表明:导热率高的回填料可以在一定范围内提升换热孔的换热量。The relevant experiments on the influence of the heat transfer capacity of the buried holes from three backfilling materials including medium coarse sand,cement mortar and barite powder,have been conducted under the lithostratigraphic condition in Pinggu mountainous areas of Beijing.Firstly,the thermal conductivity of the three kinds of backfilling materials is obtained from test in the laboratory.Secondly,the three kinds of materials are used to backfill three heat exchange holes,after the heat exchange being stabilized,we carry out the field thermal response test to obtain the heat exchange capacity of three holes.Finally,we monitor the heat exchange from the single hole,and then calculate the heat exchange capacity and analyze the final data.The results show that the thermal conductivity of cement mortar and barite powder is higher than that of medium coarse sand,as well as the heat exchange capacity.Therefore,the high thermal conductivity of the backfilling materials can improve the heat exchange capacity of the holes in a certain range.

关 键 词：回填料 地埋孔 现场热响应测试 导热系数 换热量 岩石地层 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]