The Design And Experiment Of An Aerodynamic Force Pipeline Transportation System For Powder Goods

Pipeline transportation has advantages of continuous transport, high transport efficiency,little energy consumption, little environmental pollution, easy to implement automaticmanagement etc. Using the aerodynamic force pipe to transport powder goods has the benefitof releasing the railway transport capacity and economizing water resource, so, which hasgreat practical significance. This thesis aims to study and design an aerodynamic pipe totransport powder goods. Firstly, We study the gas-solid two-phase flow consisted ofpulverized coal and nitrogen gas with the ways of Modeling, simulation and experiment, andthen, the related parameter values is determined. At last, designing the pipe system and itsmain component. The specific as follow:(1)Firstly, the flow characteristics of pulverized coal、nitrogen gas and their mixture arestudied with gas-solid two-phase flow theory. Based on the fluid mechanics experienceformula of gas-solid two-phase flow, looking up the pipeline manual and standards, drawingon other pipeline operation parameters. we determine the basic parameter values or parameterscopes of two-phase flow preliminarily, such as the density and concentration of pulverizedcoal, mass flux and gas volume rate in the pipe etc.(2)The concentration distribution law of pulverized coal in pipe is studied in differentparticle size by means of experiment, and do the contrastive analysis with other experiments.The analysis results show that when the pipe diameter is small, the concentration ofpulverized coal is low in the middle part of pipe; and the concentration of pulverized coal ishigh near the shell of pipe, and it is contrary when the pipe diameter is big. And then, we fixthe particle size of pulverized coal in the aerodynamic transportation pipe, the average particlesize is0.8mm.(3)The pipe is studied by dividing grid. And then, based on the two-equation model,selecting the key point of the pipe, the concentration distribution and velocity distribution ofpulverized coal are studied by control-volume method and quadratic interpolation. By thisway, it is concluded that when the pipe diameter is big enough and pressure is suppliedsufficiently, the concentration and velocity of pulverized coal are higher in the middle part ofthe pipe then near the shell of the pipe. It means the pulverized coal could be transported inthe middle part of the pipe, which is benefited to reduce the pipe friction resistance.(4)We in this thesis propose a mass-energy conservation model for one dimensional flowto explore the flow characteristic of long distance pipeline. By simulating the flow of15kmpipeline with Matlab, we get the velocity and flow distribution chart in different density andconcentration of pulverized coal, and velocity changing diagram in different time steps. At last, we determine the parameter values of annual volume of traffic, mass flux, gas volumerate, velocity, pressure and pressure-drop etc.(5)On the basis of the front experiment and simulation, we design the pipeline systemfurther, containing the function design and the structure and size design of main component.Secondly we calculate the values of pressure and pressure-drop; and then design the powerpump system, temperature control system, powder goods collection device, pipe welding andinterfaces. Finally, an aerodynamic pipeline system is designed to transport powder goods.