The Influence of Coal Water Slurry Particle Size on the Erosion of Reducing Pipe

Abstract

AbstractCoal chemical industry transportation of coal slurry is a typical solid–liquid two-phase flow, this process is accompanied by the erosion and abrasion of the pulverized coal slag on the inner wall of the pipeline. This phenomenon will have a significant impact on the service life of the transportation components and become a hidden engineering hazard. Aiming at the erosion problem of the coal chemical transportation system, the variable diameter pipe in the commonly used pipeline in this working condition is taken as the research object, based on the actual working condition, using the discrete phase model, track and solve the particle motion trajectory information under the Lagrange framework to obtain particle motion information. And combining this information with the erosion model, the effect of the particle size of the cinder and coal powder on the erosion of the inner wall of the pipeline is analyzed. The results show that as the particle size increases, the maximum erosion wear rate decreases. When the particle size is less than 500 μm, the maximum erosion wear rate decreases faster, when the particle size is greater than 500 μm, the maximum erosion wear volume decreases slowly. This study can provide a certain theoretical basis for the design of coal chemical transportation pipelines and the research on erosion, wear and maintenance.KeywordsErosionDPM modelParticle sizeSolid–liquid two-phase flow