埋管内流体采热状态下充填体释热性能的数值模拟（英文）

Numerical simulation of heat release performance of filling body under condition of heat extracted by fluid flowing in buried tube

在矿山充填体内布置采热埋管,是矿床-地热协同开采技术的基本要求,而充填体的释热性能直接影响地热的采出效率。本文基于换热基本理论,利用FLUENT模拟软件建立充填体释热过程的三维非稳态换热模型,并以水平U型采热埋管为研究对象,分析充填体释热过程中采热埋管周围充填体温度场的变化规律,探讨充填体初始温度、采热埋管管径、管内采热流体的入口流速、入口温度对其轴向一定距离内采热流体与周围充填体两区域之间耦合传热,以及对采热流体进出口温差、充填体释热性能的影响,不仅为实现深部矿山矿产资源与地热协同开采奠定理论基础,而且也为充填体内采热埋管的布置、采热流体的工况选择提供参考依据。

It is the basic requirement of the synergetic exploitation of deep mineral resources and geothermal resources to arrange the heat transfer tube in filling body. The heat release performance of filling body directly impacts on the exploiting efficiency of geothermal energy. Based on heat transfer theory, a three-dimensional unsteady heat transfer model of filling body is established by using FLUENT simulation software. Taking the horizontal U-shaped buried pipe as research object, the variation of temperature field in filling body around buried pipe is analyzed during the heat release process of filling body;the initial temperature of filling body, the diameter of buried pipe, the inlet temperature and inlet velocity of heat transfer fluid influencing of coupling heat transfer, which exists between heat transfer fluid and surrounding filling body within a certain axial distance of buried tube, and influencing of temperature difference between inlet and outlet of heat transfer fluid and on heat transfer performance of filling body are also discussed. It not only lays a theoretical foundation for the synergetic exploitation of mineral resources and geothermal energy in deep mines, but also provides a reference basis for the arrangement of buried pipes in filling body as well as the selection of working conditions for heat transfer fluid.