共查询到20条相似文献,搜索用时 31 毫秒
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水力旋流器分离性能强化研究 总被引:9,自引:2,他引:9
设计了一种在旋流器轴心线位置具有中心固棒的新型水力旋流器,该中心固棒的引入有效地消除了旋流器内的中心空气柱。实验研究了该中心固棒替代空气柱对旋流器性能指标的系统影响。研究结果表明,采用中心固体棒取消旋流器内的空气柱后,旋流器的分离性能得到了有效的强化。与具有空气柱的旋流器相比,不管旋流器锥段结构如何变化(从普通直锥、到抛物线型锥、到双曲线型锥),具有中心固棒的旋流器均具有更高的分离总效率、更高的修正分离总效率、更小的修正分离粒度以及更高的分离精度。随着旋流器锥段内部空间的增大,中心固棒使旋流器分离性能提高的幅度也增大。 相似文献
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旋流分离技术在石油、石化工业中的应用 总被引:4,自引:1,他引:4
介绍了旋流分离器的基本结构和工作原理,并将旋流分离与其他几种分离技术在油污水处理方面进行了比较,综述了旋流分离技术用于油水分离、油污水处理、原油或其他油品脱水的研究与发展现状,并展望了旋流分离技术在石油、石化工业中的应用前景。 相似文献
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除油旋流器入口流量与基本性能的关系研究 总被引:1,自引:0,他引:1
对除油旋流器边壁的油滴粒径变化、旋流器的分离效率以及压力降与入口流量之间的关系进行了研究。结果表明 ,当入口流量达到一定程度时 ,旋流器边壁的平均粒径随入口流量的增加而降低 ,分离效率随入口流量的增加而增加。整个旋流器以及旋流器各段的压力降均与入口流量成指数关系 ,都随入口流量的增加而增加。在旋流器的压力损失中 ,进口、旋流腔及大锥段所占比例最大 ,且基本不随入口流量的变化而变化 ;小锥段次之 ,并随入口流量的增大而增大 ;直管段的压力损失所占的比例最小 ,它随入口流量的增大而不断降低。 相似文献
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In order to improve the oil‐water separation efficiency of a hydrocyclone, a new process utilizing air bubbles has been developed to enhance separation performance. Using the two‐component phase Doppler particle analyzer (PDPA) technique, the velocities of two phases, air and liquid, and air bubble diameter were measured in a hydrocyclone. The air‐liquid mixing pump can produce 15 to 60 μm‐diameter air bubbles in water. There is an optimum air‐liquid ratio for oil‐water separation of a hydrocyclone enhanced by air bubbles. An air core occurs in the hydrocyclone when the air‐liquid ratio is more than 1 %. The velocities of air bubbles have a similar flow pattern to the water phase. The axial and tangential velocity differences of the air bubbles at different air‐liquid ratio are greater near the wall and near the core of the hydrocyclone. The measured results show that the size distribution of the air bubbles produced by the air‐liquid mixing pump is beneficial to the process where air bubbles capture oil droplets in the hydrocyclone. These studies are helpful to understand the separation mechanism of a hydrocyclone enhanced by air bubbles. 相似文献
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Improvement of performance efficiency of a hydrocyclone with design modification by suppressing air core 总被引:1,自引:0,他引:1
Rajendran Sripriya Nikkam Suresh Sudipto Chakraborty Bhim Charan Meikap 《Korean Journal of Chemical Engineering》2011,28(1):225-231
Hydrocyclones have been used for beneficiation of coal and mineral in coal washeries and mineral process industries. To enhance the efficiency of hydrocyclone, it is very essential to quantify the presence or absence of air core within the hydrocyclone. In the present study, for the first time, a new hydrocyclone design has been conceptualized and tested for its efficiency in separation of particles based on gravity. Experimental investigations have been carried out using design of experiments and the results have been analyzed statistically. The results have shown that suppressing the air core improves the separation efficiency of the hydrocyclone. Efforts have been made to explain the concept through fundamentals of fluid flow in hydrocyclone. The air core has a significant effect on particle separation as the relative density of the particles approach to the fluid density. The results will be used in the development of a new design of dense medium hydrocyclone at industrial scale that will improve the separation efficiency of the hydrocyclones by separating the near gravity particles more efficiently. 相似文献
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细颗粒杂质旋流脱水油田现场试验研究 总被引:4,自引:0,他引:4
针对大庆油田现场实际情况 ,在原有室内实验研究的基础上 ,采用水力旋流器对细颗粒杂质的分离处理做了试验研究。试验结果表明 ,随流量的加大脱水率有增加的趋势 ,最高可达 90 %左右 ,但并非流量越高越好 ;分流比为 8.75 %以下时效果较为理想 ,但分流比过小时 ,旋流器底流管路中出现明显堵塞现象 ;5°锥角旋流器的分离效果要优于 8°锥角旋流器 ,且压力损失相对较低。初步试验研究表明 ,采用水力旋流器对油田污水中的细颗粒杂质进行处理是可行的 相似文献
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本文重点研究了液—液旋流器的进口几何尺寸和锥度对旋流器流量和压力特性的影响,通过全因素试验揭示了进口几何尺寸和锥度的不同组合下流量和压力的变化规律,表明进口几何尺寸和锥度存在最佳的匹配关系。根据能量消耗最小原则,优化了单锥旋流器进口几何参数和锥度,对单锥脱油旋流器的设计具有指导意义 相似文献
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The three dimensional flow patterns in a 3-in. diameter hydrocyclone operating without an air cone were studied using tracer particles and cine photography. Analysis of films at 55 locations inside the hydrocyclone yielded data for 18 velocity profiles at six vertical positions. These data were checked for consistency and compared with the results of earlier work in hydrocyclones operating with air cores. The tangential velocity profiles were found to be similar to those produced with an air core although, n. in VAIn = const, is about 0.2 to 0.4 instead of 0.7 to 0.8 for air core operation. In this work the radial velocity component was relatively independent of radius. 相似文献
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Luiz G.M. Vieira João J.R. DamascenoMarcos A.S. Barrozo 《Chemical Engineering and Processing: Process Intensification》2010
In this work, the performances of conventional hydrocyclones have been compared with a new configuration, known as filtering hydrocyclone. This non-conventional solid–liquid separator consists of a hydrocyclone whose conical section is replaced by a conical filtering wall. Thus, during the operation of these devices, besides the underflow and overflow streams, there is another stream of liquid, resulting from the filtrate produced in the porous cone. The experimental and CFD results, obtained in 25 different configurations of both conventional and filtering hydrocyclones, show that the performance of hydrocyclones is significantly influenced by the replacement of the conical section of the conventional device by a conical filtering wall. The separation performance and the capacity can be enhanced with the filtering hydrocyclones, as compared with similar conventional. 相似文献
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利用库尔特粒径检测技术,对一种优选结构液-液旋流分离管的分离特性进行了较为系统的实验研究。实验测得该旋流管的临界分离粒径为30μm,而相同条件下国外典型产品,即F型旋流管的临界分离粒径为60μm,表明这种优选结构旋流管的分离特性较F型旋流管显著改善;实验结果还表明该旋流管的分离特性随处理量的增加而提高,当处理量为10m~3·h~(-1)时最好;随溢流比的加大而改善,其最佳溢流比为4%~5%;此外,还考察了为含油浓度与粒径分布之间的关系。有关结果为科学严格地评价液-液旋流分离管的分离性能提供了科学依据。 相似文献
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针对直径为50 mm的小直径水力旋流器,考察了溢流管插入深度和壁厚以及进口流量对微细物料分离效率的影响,并利用正交分析法得到了溢流管最优的插入深度、壁厚及最适的进口流量。此外,考察了两种套筒式溢流管对水力旋流器分离性能的影响。最后,在最优溢流管结构的基础上,探讨了分流比对分离效率的影响。结果表明:水力旋流器的直筒段具有一定的分离作用;对于微细物料的分离,溢流管采用薄壁且插入深度与水力旋流器直筒段长度相当的设计,有利于提高微细颗粒的分离效率。针对水力旋流器溢流管插入深度与其直径的最佳比例,小直径水力旋流器的比大直径水力旋流器的大,表明它们的分离行为存在着较大的差异。 相似文献
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基于计算流体力学(CFD)方法, 应用Fluent软件中雷诺应力模型和离散相模型, 对重分散相颗粒分离旋流器壁面的磨损情况进行了模拟研究。结果表明, 旋流分离器壁面的磨损以局部磨损为主;在入口环形区域, 颗粒对壁面的主要磨损为冲击磨损;在圆筒体和圆锥体区域, 颗粒对壁面的主要磨损为磨削磨损;磨损最严重的部位在旋流分离器的底流口。入口环形空间磨损最严重的位置在圆周方向上100°~110°;圆柱筒体壁面的磨损成螺旋向下的带状分布;越接近锥体末端, 圆锥体壁面的磨损越严重, 在底流口处达到磨损峰值。旋流分离器内部颗粒浓度高的部位磨损严重;同时入口速度增加, 旋流分离器壁面各个部位的磨损率也会相应增大。这些结果为旋流分离器的设计及应用提供了一定的指导。 相似文献
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Sub-micron particle dewatering using hydrocyclones 总被引:1,自引:0,他引:1
S. Pasquier J. J. Cilliers 《Chemical engineering journal (Lausanne, Switzerland : 1996)》2000,80(1-3):283-288
Hydrocyclones are used for dewatering of solid–liquid suspensions in many industries. Generally, however, large diameter cyclones are used and their application is restricted to large (>25 μm) particles. Small diameter (10 mm) hydrocyclones have the potential to be applied to fine particle (<10 μm) suspensions and, in particular, to collect the sub-micron fraction. This is due to the very small cutsizes that are achieved in these cyclones. In order to apply these small hydrocyclones industrially, knowledge of the range of their classification performance is required. It is found that these cyclones exhibit a fish-hook partition curve, and a high bypass fraction. The very small cutsize (<5 μm) and the relatively large bypass makes the effective collection of sub-micron particles possible. While in most hydrocyclone applications it is found that the bypass fraction equals the water recovery to the underflow, in 10 mm hydrocyclones the bypass fraction is considerably larger than the water recovery. This results in a high particle recovery to the underflow, as well as low water recovery, resulting in a high concentration ratio. Results will be presented to show the separation performance of different hydrocyclone outlet configurations and pressure drops. A general model will be presented that describes the fish-hook and that gives an explanation for its origin. It will be shown that 10 mm hydrocyclones yield a new operating regime for their application to sub-micron solid–liquid separation, as a result of high solids recoveries and low water recoveries. 相似文献
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Design and Numerical Simulation Analysis of an Integrative Gas‐Liquid‐Solid Separation Hydrocyclone
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Normally, a gas‐liquid‐solid separation includes both degassing and desanding processes, which means a relatively higher facility investment and larger energy consumption. Based on an inner‐cone hydrocyclone developed before, an integrative degassing and desanding hydrocyclone was designed. Its design idea and process are described in detail. By means of a hollow inner cone (IC), the separated liquid enters into the cone through holes on it and then flows to the liquid‐phase outlet. Due to integrative separation and tangential solid outlet, the separator has a more compact size. Simulation analysis of the effect of IC diameter and IC height on separation performance was carried out. Results indicate that with a larger IC diameter the gas content in the solid outlet decreases, while as the IC height rises, the gas content in the liquid outlet increases. 相似文献