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The Numerical Simulation and Experimental for High-Pressured Waterjet Smashing Solid Materials

Author: NiuZhuNong
Tutor: NiuZhengMing
School: Xi'an University of Technology
Course: Environmental Science
Keywords: High-pressure water jet Smash The impact of the flow field Multiphase flow Numerical Simulation
CLC: X705
Type: Master's thesis
Year: 2010
Downloads: 98
Quote: 1
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Abstract


Currently, the conventional ultrafine grinding technology exists the problem of high energy consumption, can not maintain the particles of the original crystal shape and surface gloss, it is difficult to obtain high-quality, high-purity ultrafine powder. High pressure water jet comminution technology precisely these requirements and develop a new technology. Crushed in the existing high-pressure water jet technology based on participation in the design produced a new composite hydraulic ultrafine grinding device. Impact and water wedge effect, the apparatus using a high pressure water flow treatment of crushed material and the materials and the acceleration pipe frictional shearing, grinding with a grinding medium impact with the impact of the collision between the target body, the turbulence in the water, air The role of the friction between the shear of grinding media filter plate, material crushing. The crushing device using the maximum working pressure of 17MPa high pressure piston pump for the power source, experiment with a D60 seamless steel pipe as accelerating tube, self-priming feed, and the experimental device to optimize the visual improvements. Consideration of material easy to obtain, as well as on the high-pressure water jet pulverizing adaptability, this choice of the coal as the pulverizing material experiments, respectively 12MPa, 15MPa, 17MPa work under pressure, to the same feed rate, the material for a series of time pulverizing experimental studies, the experimental results show that the same feed speed, working pressure the greater the material once the total crushing rate is higher levels of particle size of the material crushing rate also tended to increase, which increases the pressure to improve the two (0.5mm- 0.1mm) and three (0.1mm ~ 0.05mm) material crushing rate role is obvious, therefore increasing the working pressure is to raise important technical way once crushing rate. The experiment experiment election the same work under pressure (17MPa) feed speed time crush rate a series of experiments, the results show that at all levels of material crushing rate is affected by the speed of the feed were observed in the overall performance is the speed of the feed The slower the higher the total crushing rate have been increased at all levels of material crushing rate, which one and three material crushing rate is affected by the most significant impact of the speed of the feed increased substantially larger. FLUENT software flow nozzle to impact the target body at the water-gas-solid three-phase flow numerical simulation of composite hydraulic superfine grinding device. Mainly using the finite volume method supplemented by RNGk-ε turbulence model is discretized and solved, and the introduction of water-gas two-phase flow VOF model, the solid particles (coal particles) water coupled discrete phase model. The analysis according to the simulation results, the housing of the hydraulic characteristics (flow, pressure), and the particle distribution, and other characteristics. Numerical simulation the D40 better acceleration tube solid particles cluster target body at the point of impact pressure. Therefore, the optimization of the accelerating tube diameter can improve the crushing rate. Through 12 MPa, 15MPa, 17MPa numerical simulation work under pressure, in the case of the working pressure increases, the pressure of the target body at the impact increases, can be used for the completion of the impact grinding effect also increases the pressure, i.e. the material pulverizing the higher the rate. Both consistent with numerical simulation results of comparative analysis shows that the results of the experiment crushing rate.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Solid waste disposal and utilization
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