中深层地热能套管井取热影响因素分析  

Analysis on the influencing factors of thermal extraction of medium-deep geothermal coaxial tube

作　　者：张育平 刘俊 王沣浩[2] 周聪 韩元红 薛宇泽 刘博洋 ZHANG Yuping;LIU Jun;WANG Fenghao;ZHOU Cong;HAN Yuanhong;XUE Yuze;LIU Boyang(Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Shaanxi Coal Geology Group Co.,Ltd.,Xi’an 710026,China;School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shaanxi Zhongmei New Energy Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]陕西省煤田地质集团有限公司自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710026 [2]西安交通大学人居环境与建筑工程学院,陕西西安710049 [3]西安交通大学机械工程学院,陕西西安710049 [4]陕西中煤新能源有限公司,陕西西安710054

出　　处：《西安科技大学学报》2022年第5期918-925,共8页Journal of Xi’an University of Science and Technology

基　　金：陕西省自然科学基金项目(2020JM-717);陕西省重点研发计划项目(2020ZDLSF06-08);陕西省煤田地质集团有限公司重大专项(SMDZ2020ZD-6);陕西省创新能力支撑计划项目(2020PT-028)。

摘　　要：为厘清运行参数、地质参数以及管井参数对中深层地热能套管井取热能力的影响程度,基于FLUENT模拟软件建立中深层地热能套管井数值换热模型,开展换热实验测试验证模型的准确性。结合正交试验方法分析取热影响因素的显著性。结果表明:根据影响程度由大到小排序依次为地温梯度、埋管深度、入口温度、岩层导热系数、循环流量、内管导热系数、岩层密度、岩层比热容、内管壁厚、内管外径、外管壁厚、外管外径,且地温梯度与埋管深度的影响程度明显高于其它因素。由F值检验得到地温梯度、埋管深度、入口温度、岩层导热系数的F值分别为60.92,57.91,18.03,8.96,具有高度显著的影响,其作为中深层地热能套管井取热能力设计评估中的主控因素。In order to clarify the effects of operating parameters,geological parameters and tube parameters on the thermal extraction of medium-deep geothermal coaxial tube(MCT),the numerical heat transfer model of MCT was established by FLUENT software.The heat transfer field test was conducted to verify the accurancy of the established model.Simutaneously,the significance analysis on the influencing factors of thermal extraction was carried out by orthogonal test.The research results by both range analysis and variance analysis indicate that the factors in the descending order of effect extent on the thermal extraction are geothermal gradient,buried pipe depth,inlet temperature,rock-soil thermal conductivity,circulating flow rate,inner pipe thermal conductivity,rock-soil density,rock-soil specific heat capacity,inner pipe wall thickness,outer diameter of inner pipe,outer pipe wall thickness,outer diameter of outer pipe.Furthermore,the effects of the geothermal gradient and buried pipe depth are obviously higher than that of the other factors.Additonally,the variance F values of the geothermal gradient,buried pipe depth,inlet temperature,and rock-soil thermal conductivity are 60.92,57.91,18.03,8.96,correspondingly.These four factors have highly siginificant effects on the thermal extraction of MCT,which could be used as the the main control factors in the design and evaluation of thermal extraction.

关 键 词：地热 套管井 影响因素 显著性 中深层 

分 类 号：TK529[动力工程及工程热物理—热能工程]