【摘要】：本文從實際工程要求出發(fā),以強化旋流過濾器液固分離性能為原則,在傳統(tǒng)結(jié)構(gòu)的基礎(chǔ)上,通過引入粒子排布器得到了一種新結(jié)構(gòu),根據(jù)入口截面粒徑分布的不同,新結(jié)構(gòu)可分為正旋式旋流過濾器和反旋式旋流過濾器,通過Fluent商用軟件對以上三種結(jié)構(gòu)旋流過濾器的兩相流場進(jìn)行了模擬計算,對比分析了速度場、壓力場、過濾流、顆粒軌跡、顆粒濃度分布等流場特征及分離性能,同時分析了入口流量和入口寬高比對反旋式旋流過濾器流場及分離性能的影響。研究發(fā)現(xiàn),新型旋流過濾器具有較大的切向速度、軸向速度和過濾流量,為顆粒的分離提供了較大的離心力場,其中反旋式旋流過濾器具有較大的零軸速包絡(luò)面空間及較小的徑向速度,能夠有效防止顆粒返混。對于小粒徑顆粒,入射位置越靠近入口截面外壁或下端的顆粒越容易隨外旋流向下運動從底流口排出,入射位置越靠近入口截面內(nèi)壁或上端的顆粒越容易受二次渦流的影響從溢流口排出;而大粒徑顆粒受入射位置影響較小,基本都從底流口排出。反旋式旋流過濾器的粒子排布器能夠改變小粒徑顆粒的入射位置,使小粒徑顆粒主要從靠近外壁的位置進(jìn)入旋流過濾器,有利于分離過程的進(jìn)行,同時反旋式旋流過濾器各截面的顆粒濃度分布主要集中在近壁處,要優(yōu)于標(biāo)準(zhǔn)型和正旋式旋流過濾器。反旋式旋流過濾器分離效率比標(biāo)準(zhǔn)旋流過濾器高出10%左右。在一定范圍內(nèi),流量越大,反旋式旋流過濾器的分離效率、壓降及過濾流量越大;入口寬高比越小,反旋式旋流過濾器的分離效率、過濾流量越大。
[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.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ051.85

【參考文獻(xiàn)】

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本文編號：2375304