废弃矿井水源热泵抽灌井布置及参数敏感度的研究  

Investigation on the layout and parameter sensitivity for the pumping-recharging wells of water source heat pump of the abandoned mines

作　　者：张志强 黄体士 张文科 黄峰 王科荀 马雪晴 Zhang Zhiqiang;Huang Tishi;Zhang Wenke;Huang Feng;Wang Kexun;Ma Xueqing(School of Thermal Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Geo-Mineral New Energy CO.,LTD,Jinan 250013,China)

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]山东地矿新能源有限公司,山东济南250013

出　　处：《可再生能源》2024年第6期750-759,共10页Renewable Energy Resources

基　　金：山东省自然科学基金面上项目(ZR2022ME079)。

摘　　要：废弃矿井中储存着丰富的地热资源。文章以采空区矿井水为研究对象,为保证采暖季抽水温度的稳定,对废弃矿井水源热泵抽灌井布置及参数敏感度进行了研究。首先,基于达西定律及多孔介质传热理论,建立了废弃矿井水源热泵抽灌井的多物理场耦合的二维数值计算模型;其次,基于理论模型进行计算分析,模拟了14种不同抽灌井布置形式下的抽水温度变化,并根据“热贯通”发生程度,选取最为合理的抽灌井布置方案;最后,根据选取的抽灌井布置方案,研究了不同回灌温度、抽灌流量、井间距、水力坡度、含水层厚度、孔隙率等因素对抽水温度的影响。分析结果表明:三角4的布井方式在系统运行末期抽水温度仅下降了0.148 K,“热贯通”发生程度最小,布井方式最合理;含水层“热贯通”的现象对抽灌流量、井间距、水力坡度、含水层厚度等参数变化较为敏感,而对回灌温度及孔隙率的敏感度较小。The abandoned mines contains abundant geothermal resources.This article takes the mine water of gob area as the research object;in order to ensure the stability of pumping temperature during the heating season,the layout and parameter sensitivity of pumping-recharging wells of water source heat pump of abandoned mine are studied.Firstly,based on the Darcy's law and the theory of heat transfer in porous media,the two-dimensional numerical calculation models of the coupled multi-physical fields of the pumping-recharged well are established.Secondly,the pumping water's temperature variation of 14 arrangement forms of pumping-recharging wells are analyzed while the theoretical models are employed.The most reasonable arrangement form can be selected according to the degree of the heat transfixion.Finally,when the selected pumping-recharging wells' arrangement form is taken into consideration,the effects of different factors including the recharge temperature,the pumping-recharging water's flow rate,the wells' spacing,the hydraulic slope,the aquifer thickness and the porosity on the pumping temperature are discussed.The results of the analysis show that the well placement method of triangle 4 only decreases the pumping temperature by 0.148 K at the end of the system operation,and the occurrence of "thermal penetration" is the least and the well placement method is the most reasonable.The occurrence of "heat transfixion" in the aquifer is more sensitive to parameters such as pumping flow rate,well spacing,hydraulic gradient,and aquifer thickness,while it is less sensitive to recharge temperature and porosity.

关 键 词：废弃矿井 水源热泵 抽回灌井 热贯通 合理布置 参数敏感度 数值模型 

分 类 号：TK529[动力工程及工程热物理—热能工程]