热管换热器间距对相变充填体蓄释热性能的影响OA北大核心CSTPCD
Influence of spacing between heat pipe exchangers on the thermal storage and release performance of phase change backfill body
为了高效利用高温矿井的地热资源,解决高温环境对开采过程的影响,建立了热管-相变充填体矿井地热开采系统三维非稳态传热数值模型,研究了热管换热器与围岩布置间距对系统温度、相变材料液相分数、循环冷却水温度以及系统蓄热量、释热量的影响.结果表明:热管距离围岩越近,蓄热阶段相变材料熔化越快,蓄/释热共存阶段相变材料凝固越慢;随着热管与围岩间距的减小,热管冷凝端循环冷却水的出口温度和进出口温差增大,当热管与围岩间距从95 mm减小至20 mm时,系统稳定运行时冷却水进出口温差将由2.50K增大至4.97 K;蓄热阶段,系统蓄热量随时间推移先逐渐增大,后维持恒定不变,蓄/释热共存阶段,系统释热量将以先逐渐减小,后恒定不变的速率持续增大;当热管与围岩布置间距由95 mm减小到20 mm时,系统总蓄热量提高72.89%,系统释热量提高91.10%,系统能效系数由81.71%增大到90.32%.研究结果可为热管-相变材料耦合系统在矿井地热高效开采与利用方面提供理论依据和技术指导.
In order to efficiently utilize the geothermal resources of high-temperature mines and solve the impact of high-temperature environment on the mining process,a three-dimensional unsteady heat transfer numerical model of the heat pipe-phase change backfill body mine geothermal mining system was established.The influences of the arrangement spacing between the heat pipe heat exchanger and the surrounding rock on system temperature distribution,liquid fraction of phase change material,circu-lating cooling water temperature,and heat storage capacity and heat release capacity of system were studied.The results indicate that the closer the heat pipe is to the surrounding rock,the faster the melt-ing of PCM is during the heat storage stage,and the slower the solidification of PCM is during the coex-istence stage of heat storage and release.The outlet temperature and inlet-outlet temperature difference of the circulating cooling water at heat pipe condensation section will increase with the decrease in the distance between heat pipe and surrounding rock.As the spacing between heat pipe and surrounding rock decreases from 95 mm to 20 mm,the inlet-outlet temperature difference of cooling water during the stable operation process increases from 2.50 K to 4.97 K.During the heat storage stage,the system heat storage capacity first increases gradually and then remains constant over time.During the coexis-tence stage of heat storage and release,the system heat release continues to grow at a rate which gradu-ally decreases first and then remains constant.When the layout distance between heat pipe and sur-rounding rock decreases from 95 mm to 20 mm,the system total heat storage capacity increases by 72.89%,the heat release capacity increases by 91.10%,and the system energy efficiency coefficient increases from 81.71%to 90.32%.The research results can provide theoretical basis and technical guidance for the efficient exploitation and utilization of geothermal energy in mines using the heat pipe phase change material coupling system.
王雪丽;张鹏举;刘浪;杜研;孙雪花;姬长发
西安科技大学 能源学院,陕西 西安 710054西安科技大学 能源学院,陕西 西安 710054||西安科技大学 西部矿井开采及灾害防治教育部重点实验室,陕西 西安 710054西安科技大学 人文与外国语学院,陕西 西安 710054
矿山工程
充填开采热管换热器集总热阻网络模型布置距离蓄/释热性能
backfill miningheat pipe exchangerlumped thermal resistance network modellayout dis-tanceheat storage/release performance
《西安科技大学学报》 2024 (004)
668-679 / 12
国家自然科学基金项目(52304154);陕西省科技厅项目(2021JQ-569);陕西省教育厅项目(20JK0767)
评论