School of Human Settlements and Civil Engineering, Xi’an Jiaotong University
Shaanxi Hydrogeology Engineering Environment Geology Survey Center
Shaanxi Yateer Scientific and Technological Innovation Construction Co., Ltd.

我国关中地区地热资源丰富，中深层地热能供暖技术具有广阔的应用前景，而地质参数是影响中深层地埋管供暖系统性能的决定性因素。针对陕西关中地区中深层地埋管供暖性能展开研究，通过梳理关中地区咸阳市兴平市、咸阳市渭城区、西安市高陵区、西安市鄠邑区、西安市长安区5个典型区域的地质参数，结合典型地埋管结构参数，对长期运行下的换热器性能及热作用半径变化规律进行模拟计算。结果表明，不同地区换热器运行之初的性能变化较为显著，但均在经过5 a左右运行后趋于稳定。地埋管深度从2 000 m增至2 500 m时，出口水温有着明显的提升，同一时刻下出口水温的涨幅可达8%，各采暖季末的出口水温随深度增加的变化更为显著。由于长期运行，年平均取热功率呈现下降趋势，20 a内的总降幅为11%~12%；随着换热器埋深的增加，取热功率涨幅可达41.41%~53.23%。热作用半径受埋深的影响不显著，不同埋深管道运行20 a后的井底最大热作用半径均在50 m左右；土壤温度受与换热器距离及运行时长的影响更大，距离20 m以内的土壤温度呈现明显的波动下降趋势，而距离在60 m以外的土壤温度在20 a的运行期内降幅很小。此外，由于具有大厚度新近系张家坡组(N2z)和新近系蓝田−灞河组(N2l+b)的地质条件，西安市鄠邑区、高陵区以及咸阳市兴平市等地区地埋管的出口水温、取热功率较高，更适宜开展中深层地热能供暖利用。研究成果有望为关中地区中深层地热能高效利用提供参考。

Technologies for heating utilizing medium-deep geothermal energy exhibit promising application prospects in the Guanzhong area of China, which boasts abundant geothermal resources. Geological parameters serve as determining factors in the performance of medium-deep borehole heating systems. This study aims to explore the performance of medium-deep borehole heating systems in the Guanzhong area, Shaanxi Province. First, this study analyzed the geological parameters of five typical areas in Guanzhong: Xingping City under the jurisdiction of Xianyang City, Weicheng District of Xianyang, and Gaoling, Huyi, and Chang’an districts of Xi’an City. Then, by combining the typical structural parameters of buried pipes, this study simulated the performance and thermal influence radius of borehole heat exchangers under long-term operation. The results show that the performance of borehole heat exchangers arranged at different locations changed significantly at the beginning but tended to stabilize after around five years of operation. As the depth of buried pipes increased from 2000 m to 2500 m, the outlet water temperatures exhibited a significant upward trend, increasing by up to 8% at the same moment. The outlet water temperatures at the end of various heating seasons varied more significantly with an increase in the burial depth. Under the long-term operation, the average annual heat transfer rates showed a downward trend, with a total decreased amplitude reaching 11%-12% within 20 years. As the burial depths of borehole heat exchangers increased, the heat transfer rates rose by up to 41.41%-53.23%. The depths of buried pipes produced insignificant effects on thermal influence radii. After 20 years of operation, pipes with different burial depths displayed maximum thermal influence radii at the bottomhole of approximately 50 m. The soil temperature was significantly influenced by the distance from borehole heat exchangers and their operation duration. Specifically, the soil temperature within a distance of 20 m from heat exchangers manifested a pronounced downward trend with fluctuations, whereas that beyond a distance of 60 m showed a minimal decrease during 20 years of operation. Owing to the considerable thicknesses of the Neogene Zhangjiapo (N2z) and Lantian-Bahe (N2l+b) formations, buried pipes in Xingping City and the Huyi and Gaoling districts of Xi'an yielded relatively high outlet water temperatures and heat transfer rates. This suggests that medium-deep geothermal energy in these areas is more suitable for geothermal heating. The results of this study will provide a reference for the efficient utilization of medium-deep geothermal energy in the Guanzhong area.

陕西省重点研发计划国际科技合作项目(2023-GHZD-54)；陕西省秦创原“科学家+工程师”队伍建设项目(2022KXJ-049)；自然资源部煤炭资源勘查与综合利用重点实验室开放课题(KF2021-2)

张智斌，马真迪，郝建科，等. 关中地区中深层地埋管换热器长期运行性能研究[J]. 煤田地质与勘探，2024，52(1)：129−139.

ZHANG Zhibin，MA Zhendi，HAO Jianke，et al. Long-term operation performance of medium-deep borehole heat exchangers in the Guanzhong area[J]. Coal Geology & Exploration，2024，52(1)：129−139.