场地地下水源热泵系统抽灌实验及数值模拟研究  

The Pumping- Recharging Test of Site Groundwater Source Heat Pump System and Its Value Simulation

作　　者：余期冲[1] 祝晓彬[1] 吴吉春[1] 吴剑锋[1] 杨仪[2] 

机构地区：[1]南京大学地球科学与工程学院/表生地球化学教育部重点实验室,江苏南京210023 [2]江苏省地质工程勘察院,江苏南京211102

出　　处：《地下水》2015年第3期24-27,62,共5页Ground water

基　　金：国家自然科学基金项目"非均质条件下土壤-地下水系统中重非水相液体(DNAPLs)运移行为及其数值模拟(41030746)";"华北平原典型区咸水下移机理及数值模拟研究

摘　　要：基于野外实际地下水源热泵系统和长时间抽灌实验,构建场地水文地质概念模型和水热耦合模型,进行场地地下水温度场数值模拟研究。利用场地群井观测数据对所建模型进行验证,诸观测孔各时段的绝对误差均值为0.38℃,平均相对误差率为2.00%,表明模型模拟结果良好。模型经验证后,预测不同抽灌模式下温度场分布,发现季节性交替抽灌结果优于正常抽灌,但均产生热贯通现象,说明现状抽灌井距(30 m)偏小。设计不同抽灌井距情况模拟回灌井对抽水井的影响,得到研究场地合理井距为50 m。进一步研究渗透系数、热弥散度、抽灌水量和回灌水温差对合理井距的影响,发现抽灌水量和回灌水温差的影响最大。Based on an actual groundwater source heat pump system with a prolonged pumping-recharging test,the paper establishes the hydro-geological conceptual model and groundwater-thermal coupling model to study on simulation distribu-tion of groundwater temperature. The simulated temperatures agree well with the observed values,with an average absolute er-ror of 0. 38℃ and a relative error of 2. 00%. After verification,the model is used to predict the temperature distribution in different pumping and recharging mode. The results show that the seasonal alternate pumping is better than the normal pum-ping but both produce heat transfixion phenomenon,which the reason is shorter of the pumping and recharging well spacing （30m）. Different spacing between pumping and recharging well was discussed to understand the influence of recharging well on pumping well and found that suitable well spacing was equal to 50m in the study area. Therefore,several parameters related to the well spacing are discussed in this paper. The quantities of pumping and re-pouring and recharging temperature differ-ence are primary factors.

关 键 词：地下水源热泵系统 地下水热量运移 合理井距 

分 类 号：P641.73[天文地球—地质矿产勘探]