水平弯管盐泥流动磨损仿真分析

Simulation Analysis of Flow and Wear of Salt Mud in Horizontal Elbow

盐泥为工业制盐流程中卤水净化工艺后产物,盐泥随意排放不仅污染环境,也会对资源造成极大浪费,需对盐泥进行无害化资源化处理。盐泥为固液两相流流体,对盐泥的无害化资源化处理需要管路的输送,为了探究盐泥在弯管中流动时对管道的冲蚀磨损速率,利用Fluent仿真软件对其进行分析。选用RNG k-ɛ湍流模型和DPM模型,盐泥对弯管的冲蚀模型和颗粒碰撞恢复模型采用E/CRC冲蚀磨损模型和GrantandTabaoff壁面碰撞恢复函数,考虑液固两相之间的耦合,对盐泥在水平弯管中的流动进行研究。研究结果表明:盐泥对水平弯管弯头压力分布场呈现为外侧压力大、内侧压力小,而速度分布场则与压力场恰好相反。盐泥颗粒与弯管内壁发生首次碰撞的部位在弯头外侧的出口段,一些颗粒还会发生多次碰撞。弯管内壁存在冲蚀磨损弯,弯头外侧磨损速率显著大于弯头内侧,而且磨损最严重的部位发生在弯头出口20°附近。

Salt mud is the product of brine purification process in the industrial salt making process.The random discharge of salt mud will not only pollute the environment,but also cause a great waste of resources.It is necessary to carry out harmless and resource-based treatment of salt mud.Salt mud is a solid-liquid two-phase flow fluid.The harmless and resource treatment of salt mud requires pipeline transportation.In order to explore the erosion and wear rate of salt mud on the pipeline when it flows in the elbow.Using fluent simulation software,RNG k-ɛTurbulence model,DPM model,E/CRC erosion wear model and Grant and Tabaoff wall collision recovery function,considering the coupling between liquid and solid phases,the flow of salt mud in horizontal elbow is studied.The results show that the pressure distribution field of horizontal elbow caused by salt mud is large on the outside and small on the inside,while the velocity distribution field is just opposite to the pressure field.The first collision between salt mud particles and the inner wall of the elbow is at the outlet section outside the elbow,and some particles will collide many times.There is erosion wear on the inner wall of the elbow,the wear rate on the outside of the elbow is significantly higher than that on the inside of the elbow,and the most serious wear occurs near 20°of the elbow outlet.