可再生能源2024，Vol.42Issue(10)：1302-1312,11.
垂直井闭循环地热系统热提取性能和注入优化数值模拟
Simulation of heat extraction and injection optimization from a vertical-well closed-loop geothermal system
摘要
Abstract
To evaluate the heat extraction performance and optimize the injection parameters of a single-well Closed-Loop Geothermal System(CLGS),this paper analyzes the short-term(thermal response testing)and long-term(one heating season)heating performance of CLGS and optimizes operation parameters including injection temperature and rate,based on wellbore-reservoir coupling simulation and site operation monitoring data for a typical site in Northeast China.The results indicate that the mean heat extraction rate is 65.2 kW and the average temperature difference between the output and inlet is 4.9 ℃ with an average injection temperature of 7 ℃ and an injection flow rate of 7.7 m3/h for a vertical well of 1 700 m.At the end of a heating season,the maximum range for temperature reduction in the formation is approximately 7 m with the maximum temperature decrease up to 23℃,and it can recovery better during the non-heating period.Without considering operating costs and sustainable development,the low injection temperature and large injection rate result in high heat extraction rate.Setting the injection temperature to 5 ℃ and flow rate to 6.3 m3/h can minimize operating costs while meeting heating needs,reducing costs by 20%compared to the existing solution.The optimization design that considers operating costs and sustainable development has practical significance for a single well closed-loop geothermal system.关键词
地热供暖/垂直井闭循环地热系统/性能评价/注入优化/数值模拟Key words
geothermal heating/vertical-well closed-loop geothermal system/performance evaluation/optimization of injection/numerical simulation分类
能源科技引用本文复制引用
马永法,刘艳,李昌,雷宏武,周学军,袁利娟,刘玲,董俊领,王旭,詹涛,何兰,刘新..垂直井闭循环地热系统热提取性能和注入优化数值模拟[J].可再生能源,2024,42(10):1302-1312,11.基金项目
自然资源部浅层地热能重点实验室经费资助(KLSGE202301-03) （KLSGE202301-03）
地热资源开发技术与装备教育部工程研究中心经费资助(23019) （23019）
地下水资源与环境教育部重点实验室经费资助(202306ZDKF17) （202306ZDKF17）
黑龙江省地质矿产局科研基金项目资助(HKY202310,HKY202408) （HKY202310,HKY202408）
黑龙江省财政资金项目(SRKC-2019002). （SRKC-2019002）
