粒子排布器对旋流过滤器分离性能强化的数值模拟
发布时间：2018-12-12 21:51
【摘要】：本文从实际工程要求出发,以强化旋流过滤器液固分离性能为原则,在传统结构的基础上,通过引入粒子排布器得到了一种新结构,根据入口截面粒径分布的不同,新结构可分为正旋式旋流过滤器和反旋式旋流过滤器,通过Fluent商用软件对以上三种结构旋流过滤器的两相流场进行了模拟计算,对比分析了速度场、压力场、过滤流、颗粒轨迹、颗粒浓度分布等流场特征及分离性能,同时分析了入口流量和入口宽高比对反旋式旋流过滤器流场及分离性能的影响。研究发现,新型旋流过滤器具有较大的切向速度、轴向速度和过滤流量,为颗粒的分离提供了较大的离心力场,其中反旋式旋流过滤器具有较大的零轴速包络面空间及较小的径向速度,能够有效防止颗粒返混。对于小粒径颗粒,入射位置越靠近入口截面外壁或下端的颗粒越容易随外旋流向下运动从底流口排出,入射位置越靠近入口截面内壁或上端的颗粒越容易受二次涡流的影响从溢流口排出;而大粒径颗粒受入射位置影响较小,基本都从底流口排出。反旋式旋流过滤器的粒子排布器能够改变小粒径颗粒的入射位置,使小粒径颗粒主要从靠近外壁的位置进入旋流过滤器,有利于分离过程的进行,同时反旋式旋流过滤器各截面的颗粒浓度分布主要集中在近壁处,要优于标准型和正旋式旋流过滤器。反旋式旋流过滤器分离效率比标准旋流过滤器高出10%左右。在一定范围内,流量越大,反旋式旋流过滤器的分离效率、压降及过滤流量越大;入口宽高比越小,反旋式旋流过滤器的分离效率、过滤流量越大。
[Abstract]:Based on the practical engineering requirements and the principle of enhancing the liquid-solid separation performance of swirl filters, a new structure is obtained by introducing a particle distributor on the basis of the traditional structure, according to the different particle size distribution of the inlet section. The new structure can be divided into positive swirl filter and inverse swirl filter. The two-phase flow field of the above three kinds of swirl filters is simulated by Fluent commercial software, and the velocity field, pressure field and filter flow are compared and analyzed. The flow field characteristics and separation performance of particle locus and particle concentration distribution are analyzed. The effects of inlet flow rate and ratio of inlet width to height on flow field and separation performance of reverse spin swirl filter are analyzed. It is found that the new swirl filter has large tangential velocity, axial velocity and filtration flow rate, which provides a large centrifugal force field for the separation of particles. The anti-rotating swirl filter has a large zero-axial velocity envelope space and a smaller radial velocity, which can effectively prevent particle backmixing. For small particles, the closer the incident position is to the outer wall or lower end of the inlet section, the easier it is to move downward with the outer swirl from the bottom outlet. The particles near the inner wall or the upper end of the inlet section at the incident position are more easily discharged from the overflow outlet under the influence of the secondary eddy current. However, the large particle size is less affected by the incident position, and is basically discharged from the bottom outlet. The particle distributor of the reverse swirl filter can change the incident position of the small particle size and make the small particle enter the swirl filter mainly from the position near the outer wall, which is beneficial to the separation process. At the same time, the distribution of particle concentration in each cross section of the reverse swirl filter is mainly concentrated near the wall, which is superior to the standard and the normal swirl filter. The separation efficiency of reverse swirl filter is about 10% higher than that of standard swirl filter. In a certain range, the greater the flow rate, the greater the separation efficiency, pressure drop and filtration flow rate of the backspin swirl filter, and the smaller the ratio of inlet width to height, the greater the separation efficiency and filtration flow rate of the backspin swirl filter.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.85
[Abstract]:Based on the practical engineering requirements and the principle of enhancing the liquid-solid separation performance of swirl filters, a new structure is obtained by introducing a particle distributor on the basis of the traditional structure, according to the different particle size distribution of the inlet section. The new structure can be divided into positive swirl filter and inverse swirl filter. The two-phase flow field of the above three kinds of swirl filters is simulated by Fluent commercial software, and the velocity field, pressure field and filter flow are compared and analyzed. The flow field characteristics and separation performance of particle locus and particle concentration distribution are analyzed. The effects of inlet flow rate and ratio of inlet width to height on flow field and separation performance of reverse spin swirl filter are analyzed. It is found that the new swirl filter has large tangential velocity, axial velocity and filtration flow rate, which provides a large centrifugal force field for the separation of particles. The anti-rotating swirl filter has a large zero-axial velocity envelope space and a smaller radial velocity, which can effectively prevent particle backmixing. For small particles, the closer the incident position is to the outer wall or lower end of the inlet section, the easier it is to move downward with the outer swirl from the bottom outlet. The particles near the inner wall or the upper end of the inlet section at the incident position are more easily discharged from the overflow outlet under the influence of the secondary eddy current. However, the large particle size is less affected by the incident position, and is basically discharged from the bottom outlet. The particle distributor of the reverse swirl filter can change the incident position of the small particle size and make the small particle enter the swirl filter mainly from the position near the outer wall, which is beneficial to the separation process. At the same time, the distribution of particle concentration in each cross section of the reverse swirl filter is mainly concentrated near the wall, which is superior to the standard and the normal swirl filter. The separation efficiency of reverse swirl filter is about 10% higher than that of standard swirl filter. In a certain range, the greater the flow rate, the greater the separation efficiency, pressure drop and filtration flow rate of the backspin swirl filter, and the smaller the ratio of inlet width to height, the greater the separation efficiency and filtration flow rate of the backspin swirl filter.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.85
【参考文献】
相关期刊论文 前10条
1 袁惠新;殷伟伟;黄津;付双成;董译文;;固液分离旋流器壁面磨损的数值模拟[J];化工进展;2015年03期
2 赵立新;李宜强;徐保蕊;王，
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