Papers by Keyword: Separation Efficiency

Abstract: Mining is a relevant economic activity in many countries. In the treatment of ores, water is an indispensable input. For classification of minerals, the mineral industry uses the hydrocyclone process, where water is used as the medium for transporting dispersed ore particles, that are separated from the liquid by centrifugal force inside anequipmentnamed hydrocyclone.The constant advance of computers processing power, the evolution in the techniques and numerical methods, allow to simulate with great precision complex physical problems of fluid dynamics such as flow in hydrocyclones.In this sense, this work aims to analyze the performance of a concentrating hydrocyclone in the separation of ore and water by CFD. In the fluid dynamics simulation, the Eulerian-Lagrangian approach and the Ansys Fluent software were used. Results of pressure, velocity, and volumetric fraction fields of theinvolved phases are presented and evaluated. From the analysis of the results, it was observed that increasing the flow mixture velocity at the entrance of the equipment tends to increase the separation performance of the hydrocyclone.

Abstract: Hydrocyclone is novel optional equipment that can be applied in solid separation for crude palm oil process because of its advantage over the existing technology. Hydrocyclone is a cost-effective, continuous tool which is easy for maintenance. The objective of this research is to investigate the effect of vortex finder, inlet, and body diameter of hydrocyclone on separation efficiency of palm meal from crude palm oil by using PVC resin as the solid phase and biodiesel B5 as the liquid phase. All parameters were simulated using computational fluid dynamic, CFD. In addition, the inlet diameters were tested experimentally. The feed flow rates in both simulation and experiment were varied from 4 - 14 L/min at the constant flow ratio of 0.2. Experimental design was clearly specified. The vortex finder diameters of 3.8, 4.8, and 5.8 mm were also simulated as well as the inlet diameters of 5, 6, and 7 mm. Three sizes of body diameter of 30, 40, and 50 mm were selected as the example sizes. According to the simulation results, the smaller vortex finder, inlet, and body diameter of hydrocyclone revealed the higher separation efficiency.

Abstract: This paper analyses the basic structure and the separation theory of hydrocyclone. Three-dimension spiral flow theory and CFD method was used to simulate the Φ75mm hydrocyclone. The paper focuses on researching the separation efficiency influenced by different inlet velocities, volume fraction values and the particle diameters. Besides, the influence of the thickness of overflow pipe is also considered. Results of numerical simulation shows that with the inlet velocity range from 1 to 5m/s and the particle diameters range from 2 to 5um, the hydrocyclone separation efficiency is increasing. As the volume fraction value increased from 1% to 15%, the separation efficiency descended. Increasing the thickness of overflow pipe can reduce the turbulent kinetic energy of hydrocyclone, which can make the inner flow field more stable and enhance the separation efficiency.

Abstract: For the hydrocyclone’ separation efficiency affects by many factors, this paper combined Reynolds stress model and SIMPLEC algorithm of Fluent software with orthogonal test to simulate hydrocyclone’s operating process and analysis the flow field. Different overflow pipe wall thickness values (4mm, 8mm, 12mm), volume fraction values (1%, 5%, 10%) and inlet velocities (3m/s, 4m/s, 5m/s) was considered as the separation efficiency affective factors. Results show that the overflow pipe wall thickness has greatest influence on separation efficiency. The inlet velocity is the second and the volume fraction value is the last. The optimal combination is the overflow pipe wall thickness value 8mm, the volume fraction 5% and the inlet velocity 5m/s. The overflow pipe wall thickness value increasing can decrease the turbulent kinetic energy and increase the stability of hydrocyclone flow field.

Abstract: The internal structure and the working principle of gravity oil-water separator used for self-circulation well-flushing equipment were given. Based on CFD, the flow field was calculated and analyzed with partition plate settings. The influences on separation efficiency were analyzed, according to velocity vector diagrams and oil drop trajectory diagrams. The results show that the location of the primary partition plate is installed more reasonable, the efficiency of separation is more advantage. Also, the structure and size of the primary partition plate and the size of the auxiliary partition plate can influence the efficiency of oil-water separation regularly.

Abstract: The internal structure and the working principle of gravity oil-water separator used for self-circulation well-flushing equipment were introduced. Based on CFD, the flow field was calculated and analyzed with different quantities of horizontal deflectors and inclined deflectors in the separator. According to velocity vector diagrams and oil drop trajectory diagrams with different number of horizontal deflectors and inclined deflectors, the influence rules on separation efficiency were analyzed. The results show that the separation efficiency is improved gradually with the amount of horizontal deflectors increased, and the optimal value of separation efficiency is 3 inclined deflectors.

Abstract: The paper presented the gas flow field and particle trajectory with a series of inner cylinders in cyclone preheater using RNG k-ε turbulence model and stochastic trajectory model on the platform of Fluent software. The separability and pressure loss of cyclone preheater were investigated. The result shows the ratio of d/D and h/H of cyclone preheater was advised 0.50 to 0.65 and 0.35 to 0.60 respectively. It is also found that the numerical simulation results are in agreement with the thermal data of cement plant.

Abstract: Hydrate based technology is a promising new process for separation of Carbon dioxide from different gas mixtures. The process is claimed to be less energy intensive, green and low technology. In this article effect of composition on the efficiency of such process is discussed. CSMGem software is used for analysis. Results shows that gas phase composition have important impact on the efficiency of process.

Abstract: Three liquid-gas separator units were designed and manufactured from transparent acrylic resin based on the concept of a new kind of validated high performance condenser. The separator units had different spaces between baffle and outlet arm or different header diameters. A visualization cold state test system was set up to explore the basic principle of liquid-gas separation and liquid discharge process, using air and water as the working fluids. Four kinds of liquid flow patterns were observed by the liquid staining and high-speed photography at inlet air superficial velocities from 1m/s to 15m/s and water superficial velocities from 0.0015m/s to 0.06m/s. The effects of operation conditions and structure parameters on the separation efficiency of the liquid-gas separator units were investigated. The results showed that under the experimental conditions, the separation efficiency was more than 70%, the separation efficiency could be improved by increasing the space between baffle and outlet arm as well as the header diameter.

Abstract: Inside segregators, such as the air compressor, refrigerant and lubricant are mixed together. It is hoped that the lubricant could be reclaimed back to continue to work when it is expelled from the compressor. But designing of some kinds of air conditioning compressors has taken no notice of that, or it has lower separation efficiency. RSM (Response Surface Methods) is put forward to optimize the structure parameters so as to improve the separation efficiency. It is a collection of mathematical and statistical techniques, by which fewer experiments are needed to obtain the relationship between its parameters and their influences. Finally, by the use of computational fluid dynamics software, the optimum structure parameters are obtained, through which the better separation efficiency is available.