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

作　　者：赵永哲[1,2,3] 赵宝锋 胡振阳 苟立 杜丁山 刘成路 ZHAO Yongzhe;ZHAO Baofeng;HU Zhenyang;GOU Li;DU Dingshan;LIU Chenglu(China Coal Research Institute,Beijing 100013,China;CCTEG Xi’an Research Institute(Group)Co.,Ltd.,Xi’an 710077,China;CCTEG Xi’an Geothermal Energy Development Co.,Ltd.,Xi’an 712100,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工西安研究院(集团)有限公司,陕西西安710077 [3]西安煤科地热能开发有限公司,陕西西安712100

出　　处：《煤田地质与勘探》2025年第4期203-212,共10页Coal Geology & Exploration

基　　金：陕西省重点研发计划项目(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)。

摘　　要：【背景】积极利用中深层地热能供暖是实现碳达峰碳中和目标的重要举措。中深层地热供暖系统运行策略的优劣直接影响供暖效果,并对地热供暖系统运行能耗产生重要影响,在利用地热能的同时要避免造成资源的浪费。【方法】依托陕西关中盆地某中深层地热能实际供暖工程,基于TRNSYS瞬态模拟软件建立动态仿真模型,模拟5种运行策略的供暖效果及系统运行能耗,并对温度数据、能耗表现、运行机理进行系统性分析。【结果和结论】结果表明:(1)在供暖季初期及末期采用地热井直接换热供暖模式下的运行策略供暖效果最佳,用户侧房间温度最高32℃,COP峰值可达19;采用地热井加热泵机组梯级利用的供暖运行策略适用于供暖季中期地埋管出水温度逐渐下降时,在短期内可将用户侧房间温度保持在30℃左右,COP值最高为12.75、最低为9.06。(2)单井连续供暖运行后期可采用以热泵机组供热为主的运行策略,短期内可将用户侧房间温度保持在20~28℃,COP值最高为6.99、最低为5.22。(3)此外,在不同应用场景下需根据地埋管出水温度及用户侧房间温度对运行策略进行调整,从综合能耗表现可得出应优先采用地热井直接换热供暖的运行策略,尽量减少热泵机组开启次数及时间。(4)梯级利用应优先开启一台热泵机组、尽量减少热泵机组开启台数。对于单口井供暖的运行策略,在供暖季中后期依赖热泵机组会导致系统能耗增加,条件允许应尽量采取多井间歇运行。研究成果可应用于中深层地热同轴套管式地埋管换热系统运行策略的调整优化,同时可为运行策略的设计提供借鉴。[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 significantly affects the energy consumption of the heating system.It is necessary to prevent resource waste while utilizing geothermal 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 mechanisms.[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 contrast,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 heating 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,respectively.In addition,the operation strategy should be dynamically

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 

分 类 号：P314[天文地球—固体地球物理学] TK529[天文地球—地球物理学] TU83[动力工程及工程热物理—热能工程]