不同基岩地层条件下地埋管钻孔热响应特性及影响因素分析  

Thermal response characteristics of ground heat exchangers and influencing factors under different base-rock stratigraphic conditions

作　　者：蔡芸[1] 姚木申 卢宝[1] 赵苏民[1] CAI Yun;YAO Mushen;LU Bao;ZHAO Sumin(Tianjin Geothermal Exploration and Design Institute,Tianjin 300250,China)

机构地区：[1]天津地热勘查开发设计院

出　　处：《河北工业大学学报》2019年第3期86-90,共5页Journal of Hebei University of Technology

基　　金：中国地质调查局地质调查项目(DD20160190)

摘　　要：针对不同基岩地层条件,开展地埋管钻孔的现场热响应试验与地下换热实验,分析相关影响因素。结果表明,在目前地埋管钻孔深度范围内,初始平均地温均高于年平均气温,且二者呈正相关关系;就基岩地区热响应试验而言,岩性差异在很大程度上决定了测试结果,其中岩石热导率和热扩散率大小顺序为沉积岩(灰岩)>变质岩>火山岩(安山岩、玄武岩)。地埋管换热量不仅受地层岩性、初始地温、管内流体温度等影响,而且还受地下水径流作用影响。地下水流动性越强,对地埋管换热的强化效应也越强。Thermal response tests(TRTs)and heat transfer tests of ground heat exchangers(GHEs)are performed under different rocky stratigraphic conditions,and the influencing factors are analyzed.Results show that within the current depth range of GHEs,the initial average ground temperature is always higher than the annual average ambient tempera.ture,and there is a positive relationship between the two temperatures.The results of TRTs are obviously affected by the lithologic differences,and the thermal conductivity together with the thermal diffusivity of rocks in the work are as fol.lows:sedimentary rock(limestone)>metamorphic rock>volcanic rock(andesite and basalt).The heat transfer rate of GHEs is affected not only by stratigraphic and lithologic conditions,the initial ground temperature and the fluid tempera.ture,but also by the groundwater flow conditions.The more rapid the groundwater flows,the stronger the enhanced effect on heat transfer becomes.

关 键 词：浅层地热能 热响应试验 热物性 换热量 

分 类 号：TK529[动力工程及工程热物理—热能工程]