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针对单井循环地下换热系统的研究不足,搭建了单井循环地下换热系统物理模拟的砂箱试验台,用于研究单井循环地下换热系统地下水流动和传热规律。开展了填砾抽灌同井取热工况的初步试验研究,结果表明,砂箱试验台能够很好的物理模拟填砾抽灌同井的取热工况,抽回水温度和观测点温度变化较平稳,且观测到了明显的热贯通现象。整个试验过程中,热源井的累积取热量为6828kJ,热贯通系数为0.288。
Aiming at the lack of research on the single-well circulating underground heat exchange system, a sand box test bench for the physical simulation of single-well circulating underground heat exchange system was established to study the groundwater flow and heat transfer in the single-well circulating underground heat exchange system. The preliminary experimental study on heat recovery in the same well with gravel pumping was carried out. The results show that the sand bench can simulate well the heat extraction conditions of the same well, pull back the water temperature and observation point temperature The change is relatively stable, and obvious heat penetration is observed. Throughout the experiment, the heat source wells accumulated heat to 6828kJ, hot through coefficient of 0.288.