地能利用过程抽灌井区热贯通及其定量分析

在地下水源热利用过程中,抽、灌井区热贯通导致地能利用的衰减已经成为逐步显现的工程问题.针对几种典型井群布置模式下的热贯通问题,利用模拟计算手段,比较了抽、灌井区的热贯通时间差异和程度.通过衡量井群区域温度的扩散传输范围和速率,定量分析判断能量利用过程中的热贯通效应,为控制热贯通提供衡量参数和控制依据.研究表明,在一定的抽、灌热流动条件下,井群布置方式决定着热贯通的影响范围和程度,以及对抽灌井区能量的有效利用程度有着明显影响.

Quantitative Analysis of Thermal Breakthrough in Pumping and Injecting Well Group Area during Earth Energy Utilization

The energy conversion attenuation caused by the thermal breakthrough is gradually appeared in engineering in the groundwater thermal utilization.As to several typical arrangement modes of pumping and injecting well group,the time difference and impact degree of the thermal breakthrough were investigated by using the numerical simulation.Through evaluating the diffusion transport extent of the wells temperature,the thermal breakthrough effect in the groundwater thermal utilization was analyzed quantitatively.This work aims to provide characterization parameters and a criterion for reducing and avoiding thermal breakthrough.The results show that under certain pumping and injection heat flow condition,the arrangement mode,such as the places of pumping and injecting well group and their spacing determines the influenced extent of thermal breakthrough and plays an important role in the groundwater energy utilization.