气力输送三通接料器的仿真研究及结构优化

Simulation study and structure optimization of pneumatic conveying tee receiver

三通接料器是承接供料器和输送管的关键装置,其作用是将气体与物料进行混合,但混合区的物料易聚集管底,导致气体压力损失变大,输送物料效率降低,故有必要对三通接料器进行研究。文中重点研究了相同工况下不同直径的倾斜颗粒注入管和水平输送管对三通接料器气固两相流动特性的影响,对比分析了气体压力曲线、气体速度曲线和出口处颗粒浓度分布的变化规律,同时对结构进行优化。结果表明,不同直径的水平输送管对三通接料器流场影响较大,气体压力损失和水平输送管直径呈负相关;不同直径的倾斜颗粒注入管对三通接料器流场影响不大。相同工况下,选用φ70 mm水平输送管和φ50 mm倾斜颗粒注入管的三通接料器压力损失较小且出口处的颗粒较为均匀分布在管道截面的下半部分,输送效果最好;优化的结构解决了混合区的颗粒聚集管底,使得颗粒沿着管中心输送,能量损耗降低,输送效率增加。

Three-way receiver is the key device for the receiver and the conveying pipe,which can mix gas and materials.However,the materials in the mixing area tend to accumulate at the bottom of the pipe,which leads to the increase of gas pressure loss and the decrease of material conveying efficiency.Therefore,it is necessary to study the three-way receiver.In this paper,the influence of inclined particle injection pipe and horizontal conveying pipe with different diameters on gassolid two-phase flow characteristics of three-way receiver under the same working condition is emphatically studied,and the variation laws of gas pressure curve,gas velocity curve and particle concentration distribution at the outlet are compared and analyzed,and the structure is optimized.The results show that the horizontal conveying pipes with different diameters have great influence on the flow field of the three-way receiver,and the gas pressure loss is negatively correlated with the diameter of the horizontal conveying pipe.However,the inclined particle injection pipes with different diameters have little influence on the flow field of the three-way receiver.Under the same working conditions,the pressure loss of the three-way receiver withφ70 mm horizontal conveying pipe andφ50 mm inclined particle injection pipe is small,and the particles at the outlet are evenly distributed in the lower half of the pipeline section,so the conveying effect is the best.The structure optimization solves the problem that the particles in the mixing zone accumulate at the bottom of the tube,and ensures that the particles are transported along the center of the tube,which reduces the energy loss and improves the transportation efficiency.