地下水源热泵回灌过程颗粒迁移-脱离模型及堵塞区判定

开展多孔介质中悬浮颗粒的迁移-脱离过程研究对地下水回灌工程、注浆工程和石油工程等具有重要意义。以地下水源热泵工程为依托,提出了描述颗粒迁移-脱离过程的波浪状曲面模型,研究不同的粒径组合以及不同压力对多孔介质中颗粒迁移以及脱离特性的影响。在此基础上,采用Comsol对典型地下水源热泵工程进行模拟,揭示了不同粒径及压力分布条件下回灌堵塞区分布规律。结果表明:在相同颗粒粒径组合(相同临界速度)下,压力越大,可以脱离的悬浮颗粒的范围越大;在相同压力下,临界速度越大,可以脱离的悬浮颗粒的范围越小;其他条件相同时,位置离抽水井和回灌水井越近,压力越大,渗流速度越大,悬浮颗粒越容易脱离。

Particle Migration-Detachment Model and the Determination of Blockage Zone in Ground Source Heat Pump Recharge Process

It is important for groundwater recharge engineering,grouting engineering and petroleum engineering to study the migration-detachment process of suspended particles in porous media.Based on the groundwater source heat pump project,a wavy surface model describing the process of particle migration and detachment is proposed to study the effects of different particle size combinations and different pressures on particle migration and detachment characteristics in porous media.On this basis,the Comsol is used to simulate typical groundwater source heat pump project,and the distribution law of recharge blockage area under different particle size and pressure distribution is revealed.The results show that,(a)under the same particle size combination(same critical velocity),the larger the pressure is,the larger the range of suspended particles can be detached;(b)under the same pressure,the larger the critical velocity is,the smaller the range of suspended particles can be detached;and(c)under the same other conditions,the closer the position is to pumping wells and re-injecting wells,the greater the pressure is,the larger the seepage velocity,and the easier the suspended particles to detach.