水源热泵井回灌堵塞颗粒迁移模型的建立

Establishment of particle transport model in water source heat pump of physical clogging reinjection well

以地下水源热泵井回灌中的物理堵塞问题作为研究背景,建立基于质量平衡方程来模拟多孔介质中颗粒的迁移方程和颗粒的沉积造成孔隙损伤的数学模型。该模型充分考虑了颗粒流动速度修正系数、孔隙率修正系数以及颗粒在孔隙里发生捕获率3个因素;模型的建立考虑孔隙率变化的情况,在物质的迁移和堵塞的过程中,孔隙率的变化往往也是个动态的变化过程;与传统的过滤模型相比,考虑了速度折减系数和流量折减系数后新建模型更加系统、全面。该模型为解决回灌井物理堵塞的室内外试验研究提供理论依据。

Taking the physical clogging of water source heat pump （WSHP） as research background, based on mass balance equation, a migration equation of particles in porous media and a mathematical model of porosity damage due to particle deposition are established. The proposed model considers the velocity correction parameter, the porosity correction parameter and the probability of capture of particles. The porosity change is dynamic in the process of material migration and plugging by considering the change of porosity. Compared with the traditional filtering model, the proposed model is more systematic and comprehensive with the consideration of the speed reduction factor and flow reduction factor. It provides theoretical basis for solving the physical clogging of reinjection well in laboratory and field tests.