大型地埋管群对地下温度场和地下水环境质量影响的研究

Ground source heat pump (GSHP) is a technology using shallow geothermal energy to supply heating and cooling for buildings. The application of this technology could not only help with the energy shortage problems, but also play an active role of reducing air pollution, such as haze problem. After decades of development, China has been on a leading position of GSHP application in the world. Compared to other countries, GSHP projects in China usually have large systems. During the construction and operation process, due to various factors such as the climatic conditions and human activities, large-scale borehole heat exchanger (BHE) fields are easy to cause underground thermal imbalance and subsurface environmental pollution problems. These above mentioned problems restrict the application and promotion of GSHP technology. This research project includes field measurements, finite element numerical simulation and the establishment of a comprehensive and visualized 3D underground model. The objectives are to analyze the underground temperature distribution, development and recovery process of BHE fields, investigate the scale of groundwater temperature changes under different geological conditions, and study the impact of backfilling process on groundwater quality. This research project will provide valuable experimental data for the study of the impact of BHE fields on subsurface temperature development and important guidance for application of GSHP system. Meanwhile, the experimental and theoretical results of this project will improve our understanding of subsurface environment of large-scale BHE fields, and support underground environment, especially groundwater protection.

地埋管地源热泵作为一种利用浅层地热能的新型供冷供热技术，既可以缓解能源结构调整的压力，也对减少雾霾等大气污染起到积极作用。经过几十年的发展，我国地源热泵技术应用的规模已经在世界上处于领先地位。相较于国外的应用，我国地源热泵项目普遍趋于大型化，大规模的地埋管群在施工和运行过程中由于气候和人为等各种因素，很容易形成地下冷热不平衡及地下环境污染等问题，成为制约地源热泵技术大规模推广应用的因素。本项目拟采用实地测量、有限元数值模拟和建立三维可视地下模型等综合研究方法，深入分析地埋管群对地下温度场的影响规律及恢复周期，在不同地质条件下对地下水温度的影响范围和规律，以及温度变化和回填工艺对地下水水质的影响。本项研究将为地源热泵系统对地下温度和环境影响的研究提供宝贵的实验数据，对地源热泵系统的工程应用提供重要的理论指导，同时还将对大型地埋管群周边区域的地下环境，尤其是地下水的保护提供充分的理论依据。

地埋管地源热泵作为一种利用浅层地热能的新型供冷供热技术，既可以缓解能源结构调整的压力，也对减少雾霾等大气污染起到积极作用。经过几十年的发展，我国地源热泵技术应用的规模已经在世界上处于领先地位。相较于国外，我国地源热泵项目普遍趋于大型化，大规模的地埋管群在施工和运行过程中由于气候和人为等各种因素，很容易形成地下冷热不平衡及地下环境污染等问题，成为制约地源热泵技术大规模推广应用的因素。针对以上问题，本项目研究团队对三个具有代表性的大型浅层地热能应用项目分别进行了实地调研和周期性的地下温度测量和分析，建立了大型地埋管群地下传热模型。通过对比多个实验数据及模拟结果，分析了大型地埋管群对地下温度场及地下水的影响；比较了不同组分回填材料的性能差异，探讨了不同回填工艺及地下环境的潜在影响。在项目研究期间，发表期了刊论文6篇，会议论文1篇，开发完成相关应用软件一项，参加相关国内和国际学术会议4次。本项研究为地源热泵系统对地下温度和环境影响提供了可靠的实验数据，对地源热泵系统的工程应用提供重要的理论指导，同时还对大型地埋管群周边区域的地下环境，尤其是地下水的保护提供充分的理论依据。