由于我国部分煤矿位于城市供热管网无法到达的地区，需配备独立热源。煤矿热负荷较为特殊，主要包括建筑供暖、生活用热水及井筒防冻，在煤矿供暖保证体系中，优先级最高为井筒防冻热负荷，立井井壁结冰会对提升设备和人员的安全构成严重威胁，甚至可能发生冰凌坠落等恶性事故，因此需要稳定的热源进行供热。由于太阳能集热器受昼夜和季节变化影响大，而地热能的储存量大，热能供应稳定，因此本文以榆林地区某煤矿为主要研究对象，提出了将太阳能-热泵与中深层地埋管相结合的供热系统来满足煤矿用热需求，通过TRNSYS软件对提出的供热系统进行模拟分析，较好的满足井筒防冻及建筑供暖、生活用热水需求。此外对太阳能供给热负荷的占比与地埋管根数进行配比分析，满足煤矿热需求后选取出经济、环保的方案。本文提出的热能供给系统满足煤矿用热需求，为助力绿色“双碳”矿山建设提供新思路。

首先利用TRNBuild计算建筑供暖、生活用热及井筒防冻热负荷，可知逐时最大热负荷为3902kW，其中生活用热负荷为126kW。除中深层地热地埋管供热外，系统还涉及太阳能与热泵耦合供热，本文针对陕北地区煤矿，采用串联式太阳能-热泵供热，为了验证太阳能-热泵供热形式的合理性，搭建太阳能串联水源热泵与太阳能并联空气源热泵仿真模型进行性能分析，并通过对应的实验台验证了模型模块的准确性。串、并联式太阳能-热泵仿真模型在满足建筑供暖及生活用热全年热负荷（逐时最大热负荷1890kW）的情况下进行对比，通过分析可知：两个系统都满足用户的供热需求，太阳能串联水源热泵系统优于太阳能并联空气源热泵系统，在温度保证率相同情况下，供回水温度较为稳定；系统制热性能系数（COP）全年平均在6.9，供热量较为稳定；功率波动较小在270kW左右，能耗相对减少48.7%；通过生命周期评估，长期运行总费用减少了5.2%，故对榆林煤矿供热采用串联式太阳能-热泵供热更高效节能。

其次使用TRNSYS建立中深层地埋管-太阳能-热泵供热系统。将中深层地埋管进出口温度进行输入，通过对比不同模型的性能，得出五种运行模式，并对满足井筒防冻需求进行热量比较及换热器设计分析。供热系统的模拟结果表明：该系统供暖季热泵机组部分负荷率在70%左右，热泵最高COP可达8左右，功率可实现所需的热量；全年能耗累计为9.8×10⁶kWh。通过研究发现中深层地埋管-太阳能-热泵供热系统具有承担煤矿供热的能力。

最后，本文对中深层地埋管-太阳能-热泵供热系统参数配比进行比较。供热系统选取太阳能供给煤矿热负荷占比30%、35%、40%、45%、50%时进行研究，通过生命周期成本（LCC）计算，长期运行太阳能供给占比40%时的组合经济性较好，且系统更加节能，污染物排放量更少，并且与传统热源相比环保性更好。因此，在煤矿供热系统中，煤矿热负荷的40%采用太阳能供给，剩余60%由中深层地埋管供给经济环保。

Because some coal mines in China are located in areas where the urban heating pipe network cannot reach, they need to be equipped with independent heat sources. The heat load of coal mine is special, mainly including building heating, domestic hot water and wellbore antifreeze. In the coal mine heating guarantee system, the highest priority is the wellbore antifreeze heat load. The freezing of the shaft lining will pose a serious threat to the safety of the lifting equipment and personnel, and may even cause malignant accidents such as ice fall. Therefore, a stable heat source is needed for heating. Because the solar collector is greatly affected by day and night and seasonal changes, the storage capacity of geothermal energy is large and the heat supply is stable. Therefore, this paper takes a coal mine in Yulin area as the main research object, and proposes a heating system combining solar energy-heat pump and medium-deep buried pipe to meet the heat demand of coal mine. The TRNSYS software is used to simulate and analyze the proposed heating system, which can better meet the needs of wellbore anti-freezing, building heating and domestic hot water. In addition, the proportion of solar energy supply heat load and the number of buried pipes are analyzed, and the economic and environmental protection scheme is selected after meeting the heat demand of coal mine. The heat supply system proposed in this paper meets the heat demand of coal mines and provides new ideas for helping the construction of green ' double carbon' mines.

Firstly, TRNBuild is used to calculate the building heating, domestic heat and wellbore anti-freezing heat load. It can be seen that the maximum hourly heat load is 3902kW, of which the domestic heat load is 126kW. In addition to the heating of medium and deep geothermal buried pipes, the system also involves the coupling of solar energy and heat pump. In this paper, a series of solar-heat pump heating is used for coal mines in northern Shaanxi. In order to verify the rationality of the solar-heat pump heating form, a solar series water source heat pump and a solar parallel air source heat pump simulation model are built for performance analysis, and a corresponding experimental platform is established to verify the accuracy of the model module. The series and parallel solar-heat pump simulation models are compared under the condition of satisfying the annual heat load of building heating and domestic heat (maximum hourly heat load of 1890kW). Through analysis, it can be seen that both systems meet the heating needs of users. The solar series water source heat pump system is superior to the solar parallel air source heat pump system. Under the same temperature guarantee rate, the supply and return water temperatures are relatively stable. The Coefficient of Performance (COP) of the system is 6.9 on average throughout the year, and the heat supply is relatively stable. The power fluctuation is small at about 270kW, and the energy consumption is relatively reduced by 48.7%. Through the life cycle assessment, the total cost of long-term operation is reduced by 5.2%. Therefore, it is more efficient and energy-saving to use series solar-heat pump heating for Yulin coal mine.

Secondly, TRNSYS is used to establish a medium-deep buried pipe-solar energy-heat pump heating system. The inlet and outlet temperatures of the middle and deep buried pipes are input. By comparing the performance of different models, five operating modes are obtained, and the heat comparison and heat exchanger design analysis are carried out to meet the needs of wellbore anti-freezing. The simulation results of the heating system show that the partial load rate of the heat pump unit in the heating season is about 70%, the maximum COP of the heat pump can reach about 8, and the power can achieve the required heat. The total annual energy consumption is 9.8×10⁶kWh. Through research, it is found that the medium-deep buried pipe-solar energy-heat pump heating system has the ability to bear coal mine heating.

Finally, this paper compares the parameters of the medium and deep buried pipe-solar energy-heat pump heating system. The heating system is studied when the proportion of solar energy supply to coal mine heat load is 30%, 35%, 40%, 45% and 50%. Through the calculation of life cycle cost (LCC), the combination economy is better when the proportion of long-term solar energy supply is 40%, and the system is more energy-saving, less pollutant emissions, and better environmental protection than traditional heat sources. Therefore, in the coal mine heating system, 40% of the coal mine heat load is supplied by solar energy, and the remaining 60% is supplied by medium and deep buried pipes for economic and environmental protection.