旋流器壁面磨损行为及衬里耐磨材料试验研究

发布时间：2018-12-25 10:27

【摘要】：旋流器具有体积小、分离效率高及操作维护方便等突出优点被广泛应用于工业领域中。然而旋流器壁面磨损严重已制约其应用与发展。为提高旋流器的使用寿命,本文通过数值模拟与试验结合的方法,研究旋流器各部分磨损行为和形态以及磨损率分布。并针对性的进行耐磨材料的冲蚀磨损试验,寻找最优耐磨材料组合,提高整机使用寿命。研究结果对于降低旋流器运行成本、节约材料消耗、提高其运行可靠性具有一定的现实意义。本文利用DPM Erosion模型分析颗粒在050mm旋流器内部的运动轨迹及壁面磨损状态,发现经螺旋运动的固体粗颗粒沉积在锥体壁面。底流口是磨损最严重的部位,下锥段区域磨损次之,且由锥段中间到底流口,磨损率急剧上升,磨损率为上锥段的4.5倍;入口环形空间磨损率为柱段磨损率的4倍,柱段和顶板磨损率最小。本文通过探讨不同口径底流口对整机磨损的影响,发现底流口经磨损增大后会在一定程度上降低整机磨损,底流口直径对旋流器磨损规律影响不大。根据壁面磨损率确定分段加工原则,并在实验室进行了磨损模拟试验,根据实测结果计算不同部位的平均磨损率,试验结果与数值模拟结果一致。根据旋流器壁面磨损形貌及颗粒运动轨迹可以得出,颗粒对壁面的冲击角度不同导致了各部位有不同的磨损形式。结合受力分析及颗粒速度矢量,将旋流器磨损行为分为两个区域:撞击磨损区域和冲刷磨损区域。最后根据旋流器磨损失效形式,对7种商业用耐磨材料进行了不同冲击角度下的冲蚀磨损试验,最终确定内衬材料优化设计原则为:入口环形区域和顶板内衬邵A72的高分子材料;柱段、锥段和底流口区域内衬陶瓷材料,并对整机延长使用寿命和等寿命设计提供指导。
[Abstract]:Hydrocyclone has been widely used in industrial field because of its small size, high separation efficiency and convenient operation and maintenance. However, wall wear of hydrocyclone has restricted its application and development. In order to improve the service life of hydrocyclone, the wear behavior, morphology and wear rate distribution of all parts of cyclone are studied by numerical simulation and experiment. In order to improve the service life of the machine, the erosion wear test of wear-resistant material is carried out to find the best wear-resistant material combination. The results are of practical significance to reduce the operation cost, save the consumption of materials and improve the reliability of the hydrocyclone. In this paper, DPM Erosion model is used to analyze the motion trajectory and wall wear state of particles in 050mm hydrocyclone. It is found that solid coarse particles with spiral motion are deposited on the wall of cone. The bottom flow is the most serious part, the lower cone is the second, and from the middle to the end of the cone, the wear rate increases sharply, and the wear rate is 4.5 times of that of the upper cone. The wear rate of the inlet ring space is 4 times of that of the column segment, and the wear rate of the column and roof is the least. In this paper, the influence of different caliber bottom flow on the wear of the whole machine is discussed. It is found that the wear of the bottom flow will be reduced to a certain extent after the increase of the wear, and the diameter of the bottom flow has little effect on the wear law of the hydrocyclone. The principle of segmental machining was determined according to the wall wear rate and the wear simulation tests were carried out in the laboratory. The average wear rates of different parts were calculated according to the measured results. The experimental results were in agreement with the numerical simulation results. According to the wall wear morphology and particle motion trajectory of the hydrocyclone, it can be concluded that the different impact angle of particles on the wall leads to different wear patterns in different parts. Combined with force analysis and particle velocity vector, the wear behavior of hydrocyclone is divided into two regions: impact wear zone and erosion wear zone. Finally, according to the wear failure form of hydrocyclone, the erosion wear tests of 7 kinds of commercial wear resistant materials are carried out at different impact angles. Finally, the optimum design principles of lining materials are determined as follows: high molecular material with Shore A72 in inlet annular area and in roof lining; Column section, conical section and bottom flow zone lining ceramic materials, and provide guidance for the whole machine to extend the service life and equal life design.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD455

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