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基于含水层储能水、热运移的基本理论与控制方程,针对地下咸水层储能过程中渗流溶液密度及黏滞系数变化显著的特点,对现有的地下含水层储能数学模型进行修正、完善,建立地下咸水层耦合储能模型,探索不同储能模式下含水层温度场变化规律及阶段性热量运移特征。研究结果得到,采用地下原水与去离子水回灌时,在储热运行期与间歇停运期粗粉砂层中热作用半径变化率分别为0.272、0.008、0.348、-0.040m/d。在储能阶段,伴随回灌溶液温度上升、盐度降低,地下水渗流速度上升,导致对流传热与热弥散效应增强;间歇阶段,则由于地下咸水与回灌溶液间盐度梯度增大,在分子扩散作用下回灌溶液温度场影响范围减弱。
Based on the basic theory and governing equation of energy storage and heat transfer in aquifer, considering the obvious variation of seepage solution density and viscosity coefficient in underground saline aquifer, the existing mathematical model of underground aquifer energy storage Amended and perfected the establishment of groundwater brackish water coupling energy storage model to explore the different storage mode of aquifer temperature field and the stage of the heat transfer characteristics. The results show that when the underground raw water and deionized water are used for recharge, the change rates of thermal radius in the coarse silt layers during storage and intermittent periods are 0.272,0.008,0.348 and -0.040m / d, respectively. During the energy storage phase, with the increase of the temperature of the recharge solution, the salinity decreases and the seepage velocity of the groundwater increases, resulting in the enhanced convective heat transfer and thermal dispersion. In the intermittent phase, due to the salinity gradient between the saline solution and the recharge solution, Under the influence of molecular diffusion, the influence range of the temperature field of the rewatered solution is weakened.