煤田地质与勘探2025，Vol.53Issue(4)：203-212,10.DOI:10.12363/issn.1001-1986.24.12.0820
中深层地热供暖系统运行策略模拟研究
Operation strategy simulation of the heating system for moderately deep geothermal resources
摘要
Abstract
[Background]The active utilization of moderately deep geothermal resources for heating serves as a critical measure to achieve the goals of peak carbon dioxide emissions and carbon neutrality.Meanwhile,the effectiveness of the operation strategies of the heating system using these resources directly influences heating performance and signific-antly affects the energy consumption of the heating system.It is necessary to prevent resource waste while utilizing geo-thermal energy.[Methods]Based on a heating project using moderately deep geothermal resources in the Guanzhong Basin,Shaanxi Province,this study established a dynamic simulation model using the TRNSYS transient simulation software.Then,this study simulated the heating performance and energy consumption of the heating system under five operation strategies and conducted systematic analyses of the temperatures,energy consumption,and operational mech-anisms.[Results and Conclusions]The results indicate that during the early and late stages of the heating season,the operation strategy of direct heat exchange via a geothermal well exhibited the highest heating performance.This strategy enabled the room temperature on the user end to reach 32℃,with a peak coefficient of performance(COP)of 19.In con-trast,cascading utilization based on a geothermal well and heating pump units was suitable in the case where the water temperature at the outlets of the buried tubes gradually decreased in the middle stage of the heating season.This strategy can maintain the room temperature on the user end at about 30℃over a short period,with a maximal and minimal COP of 12.75 and 9.06,respectively.In the late stage of the continuous heat supply using a single geothermal well,the heat-ing operation strategy relying primarily on heat pump units can be adopted.This strategy allowed the room temperature on the user end to range from 20℃to 28℃in the short term,with a maximal and minimal COP of 6.99 and 5.22,re-spectively.In addition,the operation strategy should be dynamically adjusted based on the water temperature at the out-lets of buried pipes and the room temperature on the user end under varying application contexts.The overall energy consumption revealed that direct heat transfer via a geothermal well should be preferred and that the start frequency and operational duration of heat pump units should be minimized.For the cascading utilization,one pump unit should be started first,and it is necessary to minimize the number of heat pump units in operation.For the operation strategy of single-well heating,heating relying on heating pump units in the middle to late stage of the heating season led to in-creased energy consumption.Therefore,an intermittent operation strategy based on multiple wells should be employed where possible.The results of this study can be used to adjust and optimize the operation strategies of the coaxial casing-type buried pipe heat exchanger system for moderately deep geothermal resources while also providing a reference for the design of operation strategies.关键词
地热能开发利用/中深层套管式地埋管/TRNSYS模拟/运行策略/梯级利用Key words
geothermal exploitation and utilization/coaxial casing-type buried pipe heat exchanger system for moder-ately deep geothermal resources/TRNSYS-based simulation/operation strategy/cascading utilization分类
天文与地球科学引用本文复制引用
赵永哲,赵宝锋,胡振阳,苟立,杜丁山,刘成路..中深层地热供暖系统运行策略模拟研究[J].煤田地质与勘探,2025,53(4):203-212,10.基金项目
陕西省重点研发计划项目(2021ZDLSF05-12) （2021ZDLSF05-12）
中煤科工西安研究院(集团)有限公司科技创新基金项目(2022XAYJS03) （集团）
