新型大直径六给介重介质旋流器的模拟研究
发布时间：2018-10-19 12:33
【摘要】：煤炭采选一体化绿色生产作为一种新模式,通过将选煤系统建设到矿井下,使原煤中的矸石在升井之前被排出,减少矸石堆积对环境的破坏,还能节能降耗、提高煤炭资源回收率,实现煤炭资源的可持续发展。 本文主要研究一种适应于煤炭采选一体化绿色生产的大直径六给介无压给料两产品重介质旋流器。由于传统方法对于重介质旋流器的研究,具有投入经费较高、开发周期长并且易受条件限制等缺点。因此迫切需要利用计算流体力学(CFD)对重介质旋流器进行仿真模拟,以此得到通过实验方法难以得出的准确结果,缩短研究周期、节约研究费用。 首先针对普通的两产品水力旋流器进行分析,从理论上分析了旋流器内部流体速度场(轴向速度、径向速度、切向速度)和压力场的分布情况。然后利用ANSYS自带的Fluent软件,采用RSM模型以及Mixture模型模拟水和空气两相流,对一种新型的大直径六给介无压给料两产品重介质旋流器进行数值模拟。最后得到了旋流器内部流体相应的轴向速度、径向速度、切向速度以及静压力在不同截面上的分布情况。通过速度分布,可以研究流体在该新型旋流器内部的流动情况。这三个速度在新型旋流器内部具有一定的规律性,其中切向速度最大,因此可以产生较大的离心力；径向速度最小,因此增加了物料的分层时间,轴向速度大小介于两者之间。论文分析了静压力场分布情况,结果表明静压力在旋流器内具有对称性,压力随着半径的减小而减小,在中心部分出现了负压,负压的存在使得空气吸入旋流器,产生了空气柱。速度与压力的分布与普通旋流器的分布吻合,从理论上分析了该新型重介质旋流器实现分选的原理。
[Abstract]:As a new mode, the integrated green production of coal mining and separation, by constructing the coal preparation system under the mine, causes the gangue in the raw coal to be discharged before lifting the well, reduces the damage to the environment caused by the accumulation of the gangue, and can also save energy and reduce the consumption. Improve the recovery rate of coal resources and realize the sustainable development of coal resources. In this paper, a large diameter six feed medium and two products heavy medium cyclone suitable for the green production of coal mining and separation is studied. Because of the disadvantages of traditional research on heavy medium hydrocyclone, such as high investment, long development period and easy to be restricted by conditions, etc. Therefore, it is urgent to use computational fluid dynamics (CFD) to simulate the heavy medium hydrocyclone, so as to get the accurate results which can not be obtained by the experimental method, shorten the research period and save the research cost. Firstly, the distribution of fluid velocity field (axial velocity, radial velocity, tangential velocity) and pressure field in hydrocyclone are analyzed theoretically. Then a new type of large-diameter six-diameters two-product heavy medium hydrocyclone is simulated by using Fluent software of ANSYS and RSM model and Mixture model to simulate the two-phase flow of water and air. Finally, the axial velocity, radial velocity, tangential velocity and static pressure distribution in different sections of the hydrocyclone are obtained. The flow of fluid in the new hydrocyclone can be studied by velocity distribution. These three speeds have certain regularity in the new hydrocyclone, in which the tangential velocity is the largest, so it can produce a large centrifugal force, and the radial velocity is the smallest, thus increasing the stratification time of the material, and the axial velocity is between the two. In this paper, the static pressure field distribution is analyzed. The results show that the static pressure has symmetry in the hydrocyclone, the pressure decreases with the decrease of radius, the negative pressure appears in the center part, and the existence of the negative pressure makes the air suction cyclone. An air column is produced. The distribution of velocity and pressure is consistent with that of conventional hydrocyclone. The separation principle of this new type of heavy medium cyclone is analyzed theoretically.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94;TD455
本文编号：2281121
[Abstract]:As a new mode, the integrated green production of coal mining and separation, by constructing the coal preparation system under the mine, causes the gangue in the raw coal to be discharged before lifting the well, reduces the damage to the environment caused by the accumulation of the gangue, and can also save energy and reduce the consumption. Improve the recovery rate of coal resources and realize the sustainable development of coal resources. In this paper, a large diameter six feed medium and two products heavy medium cyclone suitable for the green production of coal mining and separation is studied. Because of the disadvantages of traditional research on heavy medium hydrocyclone, such as high investment, long development period and easy to be restricted by conditions, etc. Therefore, it is urgent to use computational fluid dynamics (CFD) to simulate the heavy medium hydrocyclone, so as to get the accurate results which can not be obtained by the experimental method, shorten the research period and save the research cost. Firstly, the distribution of fluid velocity field (axial velocity, radial velocity, tangential velocity) and pressure field in hydrocyclone are analyzed theoretically. Then a new type of large-diameter six-diameters two-product heavy medium hydrocyclone is simulated by using Fluent software of ANSYS and RSM model and Mixture model to simulate the two-phase flow of water and air. Finally, the axial velocity, radial velocity, tangential velocity and static pressure distribution in different sections of the hydrocyclone are obtained. The flow of fluid in the new hydrocyclone can be studied by velocity distribution. These three speeds have certain regularity in the new hydrocyclone, in which the tangential velocity is the largest, so it can produce a large centrifugal force, and the radial velocity is the smallest, thus increasing the stratification time of the material, and the axial velocity is between the two. In this paper, the static pressure field distribution is analyzed. The results show that the static pressure has symmetry in the hydrocyclone, the pressure decreases with the decrease of radius, the negative pressure appears in the center part, and the existence of the negative pressure makes the air suction cyclone. An air column is produced. The distribution of velocity and pressure is consistent with that of conventional hydrocyclone. The separation principle of this new type of heavy medium cyclone is analyzed theoretically.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94;TD455
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