Numerical Simulation Of Elbow Wear In Pneumatic Conveying System

Pneumatic conveying is widely used in the conveying granular materials process of chemical industry,thermal power generation,pharmaceutical manufacturing,metal smelting and other industries,because it’s simple structure,high efficiency and good reliability.In recent years,Pneumatic conveying has developed rapidly.It has obvious flaws,for example,when particles are moving at high speed,they have greater kinetic energy.The impact on pipelines is very huge.Therefore,pipe wear becomes a big problem in pneumatic conveying.There are few studies on the wear of pneumatic conveying in China and abroad.And in those studies,there are fewer research factors.Most of them are simulated using Fluent.That way can’t be very close to reality.This thesis analyzes the pneumatic conveying system based on EDEM-FLUENT coupling.By using the Archard Wear model to study the Wear of elbow pipe in pneumatic conveying.In this thesis,the force and wear of the pipeline in pneumatic conveying are analyzed.The pneumatic conveying system under different factors was simulated by EDEM-FLUENT coupling platform.The influence of mass flow,inlet velocity and pipe bend on the wear of bend pipe was studied.In addition to the above factors,the effects of different gravity direction,particle radius and the sphericity of particle on wear were also studied.This thesis first analyzes the factors that cause pipeline wear in pneumatic conveying.The EDEM-FLUENT coupling platform is used to simulate the pneumatic conveying system under different factors.It is studied that the pipeline wear is affected by changing the placement method,structural parameters and flow conditions.Impact.Including: gravity direction,particle mass flow,bend radius ratio,inlet gas velocity and particle properties,etc.The effect of the placement method on the wear is mainly due to the change of the particle distribution position due to gravity,and the particle distribution position change causes particles and bends.The collision area changes.For the structural parameters,the main research here is the pipe bending ratio,through the analysis finally concluded that it is through changing the collision angle between the particles and the elbow to affect the particle wear,for the flow parameters not only from the single factor,but also increased Coupling phase considerations.The use of bionics to improve the elbow makes it more excellent in terms of wear resistance.An elbow with a bionic inner wall was proposed.The incident velocity,angle of incidence,wear and distribution of the particles,gas phase flow field,and energy loss of particles were proposed.Comparing the other aspects,it is proved that the bionic pipe has good wear resistance.The performance of different inner wall shapes in anti-wear was studied,and it was proved that the semicircular rib inner wall is the best bionic inner wall shape.The structural improvement of the traditional T-type blind pipe has improved its lack of pressure loss performance.By fitting the data of the simulation experiment,a simple wear prediction equation is proposed and its accuracy is verified.The applicability of the formula under different materials is compared.