利用废弃油井和地下高温溶腔开采地热能的数值模拟.pdf

中国科技论文在线 利用废弃油井和地下高温溶腔开采地热能 的数值模拟 梁昌文，陈科** 5 （合肥工业大学机械与汽车工程学院，合肥 230009 ） 摘要：该文探究了以废气油井做为注入井和采出井，以高温溶腔做为主要热储的换热系统， 建立了注入井和采出井的二维换热模型，利用有限差分法离散了其能量偏微分方程，并用交 替半隐式算法（ADI ）求解了温度场；建立了高温溶洞换热的三维换热模型，考虑了其多孔 10 性质，并利用有限元分析软件Fluent 进行了数值分析。文中工质的物性来源于NIST 数据库 提供的实际气体模型，分析过程中考虑了其物性变化，探究了流体出口温度随运行时间、地 温梯度、入口压力、入口温度、质量流量、岩层孔隙率、工质种类等因素的变化规律，研究 结果表明，影响工质出口温度最重要的因素为入口温度、地温梯度和质量流量，在实际开采 过程中应重点考虑这几个因素。通过本的研究，为利用废弃油井和高温溶腔开采地热能进行 15 地热发电，提供了有价值的理论参考。 关键词：地热能；油井；高温溶腔；换热；数值模拟 中图分类号：TK01+9 the Numerical Simulation of Fluid Flow and Heat Transfer 20 in the Hot Cavity Underground Changwen-Liang, Chen Ke (School of Machinery and Automobile Engineering, Hefei University of Technology, Hefei 230009) Abstract : A heat transfer system, which uses oil wells abandoned as its injection and production 25 well and hot cavity as its geothermal reservoir, is studied in this paper. The 2D model of injection and production well is established, and its energy partial differential equations are discretized by finite difference method and solved through alternating direction implicit difference method (ADI). The 3D model of hot cavity is set up considering its porous property, and numerical analysis is developed in FEM software Fluent. The property of working fluid in this paper uses real gas 30 model from the database provided by NIST. The various property of fluid is took into account in the whole analysis, and the temperature of fluid at the system’s outlet are studied, which is changing as running time, geothermal gradient, inlet pressure, temperature at