固态流化法射流下的破碎颗粒运移规律的数值模拟

Numerical Simulation of Transportation of Particles in Jet Breaking with Solid Fluidization Method

为了探究非成岩天然气水合物在用固态流化法射流采掘过程中固相回收率的影响因素,依据液固两相流理论,基于DPM模型对水平采空区多相流场内固相颗粒在射流激励条件下的运移规律进行数值模拟。重点研究不同射流破碎边界和抽吸孔位置对固相回收率的影响。研究结果表明,抽吸孔改变了孔前流场的方向并提高了局部流速,有利于固相回收;射流破碎边界影响颗粒运移方向和速度衰减规律,决定了最佳抽吸孔位置。研究射流破碎边界和抽吸孔的最佳组合是一种提高固相回收率的有效方法。

In order to explore the influence factors for recovery rate of solid particles in non-diagenetic gas hydrate during jet mining process,the DPM model is used to simulate the movement of solid particles in multi-phase flow field in horizontal gob areas.Influences of interface shapes and position of the suction hole on the recovery rate of solid particles are studied.The results demonstrate that the suction hole will change flow direction in the field in front of the hole and increase local flow velocity,which is conducive to the solid particle recovery.Interface shape will affect the direction of particle migration and attenuation of the velocity,so as to be able to determine an optimal position of the suction hole.The best combination of interface shape and suction hole is effective in improving the recovery rate of solid particles.