中深层地埋管换热器最佳钻孔间距的模拟研究  

Simulation Study on Optimal Drilling Spacing of Medium and Deep Buried Tube Heat Exchanger

作　　者：杜甜甜 满意[1] 姜国心 李硕 张新雨 DU Tiantian;MAN Yi;JIANG Guoxin(LI Shuo,ZHANG Xinyu)

机构地区：[1]山东建筑大学热能工程学院

出　　处：《煤气与热力》2019年第11期21-24,10042,共5页Gas & Heat

基　　金：国家自然科学基金(51808321);山东省自然科学基金(BS2015NJ016);山东省绿色建筑协同创新中心团队建设科研基金(LSXT201502)

摘　　要：利用地热之星Ⅱ商业软件,对中深层套管式地埋管换热器最佳钻孔间距进行模拟研究。钻孔深度为2000 m,直径为446.7 mm,地埋管的高度与钻孔深度取值相同,循环水采用外进内出的流动方式。取热时间为供暖期,其他时间为土壤温度恢复时间。在地埋管取热负荷一定的条件下,钻孔热影响半径随着运行时间的延长而增大。随着运行时间的延长,供暖期的取热量超过了土壤的自然恢复能力,不利于长期运行,应考虑向土壤补热。当地埋管换热器取热负荷为200kW时,最佳钻孔间距推荐值(对应运行时间为20 a)为133 m。当运行时间一定时,钻孔热影响半径随取热负荷增大而增大。在实际工程中,中深层套管式地埋管换热器最佳钻孔间距的确定,应同时考虑取热负荷和运行时间。The optimal drilling spacing of the medium and deep casing-type buried tube heat exchanger was simulated by geothermal Star II commercial software.The drilling depth is 2000 m,the diameter is 446.7 mm,the height of the buried tube is the same as the drilling depth,the circulating water flow mode is outside into and inside out.The heat-taking time is the heating period,and the other time is the soil temperature recovery time.Under the condition that the buried tube takes a certain heat load,the thermal influence radius of the borehole increases with the extension of the operation time.With the extension of the operation time,the heat-taking quantity during the heating period exceeds the natural recovery capacity of the soil,which is not conducive to long-term operation,and should be considered to replenish the heat to the soil.When the buried tube heat exchanger takes heat load of 200 k W,the recommended value of the optimal drilling spacing(the corresponding operation time of 20 years)is 133 m.When the operation time is constant,the thermal influence radius of borehole increases with the increase of heat-taking load.In the actual project,the determination of the optimal drilling spacing of the medium and deep casing-type buried tube heat exchanger should take into account the heat load and the operation time at the same time.

关 键 词：中深层地埋管换热器 最佳钻孔间距 运行时间 取热负荷 

分 类 号：TU833.3[建筑科学—供热、供燃气、通风及空调工程]