“双碳”背景下大力开发太阳能为代表的可再生能源替代煤、石油和天然气等传统能源是我国能源结构调整的重要途径。我国具有极其丰富的太阳能资源，但存在不稳定性、周期性和间歇性的致命问题，规模化储能被认为是解决这一问题的关键。针对矿山开采形成的地下采空区，将地埋管换热器技术与矿井充填体技术相结合，借助已有矿井工程，构建具有蓄/释热功能的充填矿井储热库是利用地下空间实现规模化跨季节蓄热储能的新方法，但管群间热干扰会影响其蓄/释热性能而不容被忽视。因此，本文采用数值模拟的方法，对绝热型和非绝热型两种充填矿井储热库内部管群间热干扰的影响开展了量化研究。

利用COMSOL仿真模拟软件建立了绝热型和非绝热型储热库蛇形埋管充填体换热器的三维非稳态传热模型，并通过文献热响应试验数据验证了两种模型的可靠性。基于模型模拟了储热库埋管充填体换热器的蓄热/释热过程，分析了不同设计和运行参数等条件下储热库累积蓄/释热量及蓄/释热速率的变化规律。建立管间热干扰系数和层间热干扰系数量化研究了热物性参数、几何参数、运行参数以及地下水渗流等对储热库蓄/释热过程热干扰的影响；引入相对灵敏度讨论分析了储热库管间和层间热干扰对研究参数的敏感度。

针对绝热型充填储热库，研究了管间距、管径、充填体导热系数、比热容、传热流体入口流速和换热埋管层数对热干扰的影响。结果表明，管间热干扰系数I_tub随蓄/释热时间呈现先下降后上升的变化趋势，整体变化不大（0.92~1），说明单层蛇形埋管管间热干扰影响较小。层间热干扰系数I_lay曲线呈单调显著递减，在蓄/释热阶段末分别低于0.2和0.65，说明多层蛇形埋管层间热干扰随着蓄/释热的进行严重恶化。通过相对灵敏度分析发现，层间热干扰系数I_lay对研究参数的敏感度明显高于管间热干扰系数I_tub。层间热干扰系数I_lay对充填体比热容、管间距、充填体导热系数、埋管层数、管径和入口流速的敏感度依次降低，其中充填体比热容和管间距为正面影响，其余4个研究参数为负面影响。管间热干扰系数I_tub在蓄/释热的大部分时间段对管间距最敏感。

针对非绝热型充填储热库，研究了地下水渗流速度、渗流方向、围岩温度、围岩导热系数和传热流体入口流速对热干扰的影响。结果显示，围岩温度和围岩导热系数对于管间和层间热干扰的影响较小，不同围岩温度和围岩导热系数其热干扰系数曲线几乎重合，整体变化仅在0.04之内。低渗流速度时（10^-7m/s和5×10^-7m/s），管间热干扰系数I′_tub呈先上升后下降的趋势，高渗流速度时（10^-6 m/s~10^-5 m/s），管间热干扰系数I′_tub和层间热干扰系数I′_lay曲线呈单调递减，说明管间热干扰随蓄/释热的进行逐渐恶化。渗流方向由右到左的管间和层间热干扰明显弱于渗流方向由左到右。与绝热型充填储热库相类似地，传热流体入口流速的增大会加剧热干扰程度。

本论文构建了具有蓄/释热功能的充填矿井储热库为利用矿井采空区实施大规模地下储能提供了新思路，量化研究了关键设计运行参数对绝热型和非绝热型储热库热干扰的影响规律，为优化充填矿井储热库设计，降低热干扰提供了理论依据。

The “double carbon” background vigorously developed solar energy as the representative of renewable energy to replace coal, oil and natural gas and other traditional energy is an important way to adjust China's energy structure. The country is extremely rich in solar energy resources, but suffers from the fatal problem of instability, cyclicity and intermittency, and large-scale energy storage is seen as the key to solving this problem. The combination of buried tube heat exchanger technology and backfill technology to build a filled heat storage reservoir with heat storage/release functions is a new way of using underground space to achieve large-scale inter-seasonal heat storage, but thermal interference between groups of tubes can affect their heat storage/release performance and cannot be ignored. Therefore, this paper uses numerical simulations to quantify the effect of thermal interference between groups of tubes inside two types of filled heat storage reservoirs, adiabatic and non-adiabatic.

Three-dimensional unsteady heat transfer models for adiabatic and non-adiabatic heat storage reservoir serpentine buried tube backfill heat exchangers were developed using COMSOL simulation software and the reliability of both models was verified by literature thermal response test data. Based on the model, the heat storage/release process of the buried tube backfill heat exchanger of the heat storage reservoir is simulated, and the variation law of the accumulated heat storage/release and the heat storage/release rate of the heat storage reservoir under different design and operation parameters are analyzed. Inter-tube thermal interference coefficients and inter-layer thermal interference coefficients were established to quantify the effects of thermal physical parameters, geometrical parameters, operational parameters and groundwater seepage on the thermal interference of heat storage/release processes in heat storage reservoirs. A discussion of relative sensitivity is introduced to analyze the sensitivity of inter-tube and inter-layer thermal interference in heat storage reservoirs to the studied parameters.

The effects of tube spacing, tube diameter, thermal conductivity of the backfill, specific heat capacity, heat transfer fluid inlet flow rate and the number of layers of heat transfer buried tubes on thermal interference are investigated for adiabatic backfill heat storage reservoirs. The results show that the inter-tube thermal interference coefficient I_tub shows a trend of decreasing and then increasing with the time of heat storage/release, and the overall change is not significant (0.92~1), which indicates that the influence of inter-tube thermal interference is small for single-layer serpentine buried tubes. The inter-layer thermal interference coefficient I_lay curve is monotonically and significantly decreasing, and is below 0.2 and 0.65 at the end of the heat storage/release phase, respectively, indicating that the inter-layer thermal interference of multi-layer serpentine buried tubes deteriorates seriously with the progress of heat storage/release. The relative sensitivity analysis revealed that the inter-layer thermal interference coefficient I_lay is significantly more sensitive to the studied parameters than the inter-tube thermal interference coefficient I_tub. The sensitivity of the inter-layer thermal interference coefficient I_lay to the specific heat capacity of the backfill, tube spacing, thermal conductivity of the backfill, number of buried tube layers, tube diameter and inlet flow rate decreases in descending order, with the specific heat capacity of the backfill and tube spacing having positive effects and the remaining four studied parameters having negative effects. The inter-tube thermal interference coefficient I_tub is most sensitive to the tube spacing during most of the time period of heat storage/release.

The effects of groundwater seepage velocity, seepage direction, surrounding rock temperature, surrounding rock thermal conductivity and heat transfer fluid inlet flow rate on thermal interference are investigated for non-adiabatic backfill heat storage reservoirs. The results show that the influence of the surrounding rock temperature and the surrounding rock thermal conductivity on the thermal interference between tubes and layers is relatively small, with the thermal interference coefficient curves for different surrounding rock temperatures and surrounding rock thermal conductivities almost coinciding, and the overall variation is only within 0.04. At low seepage velocities (10^-7m/s and 5×10^-7m/s), the inter-tube thermal interference coefficient I′_tub tends to increase and then decrease, while at high seepage velocities (10^-6m/s to 10^-5m/s), the inter-tube thermal interference coefficient I′_tub and the inter-layer thermal interference coefficient I′_lay curves are monotonically decreasing, indicating that the inter-tube thermal interference gradually deteriorates as the heat storage/release proceeds. Inter-tube and inter-layer thermal interference are significantly weaker in the right-to-left direction of seepage than in the left-to-right direction of seepage. Similarly to adiabatic backfill thermal storage, the increase in the inlet velocity of the heat transfer fluid increases the level of thermal interference.

This thesis constructs a backfill heat storage reservoir with heat storage/release function to provide a new idea for the implementation of large-scale underground energy storage using mine void areas, and quantifies the influence of key design and operating parameters on the thermal interference of adiabatic and non-adiabatic heat storage reservoirs, providing a theoretical basis for optimizing the design of backfill heat storage reservoirs and reducing thermal interference.

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