scholarly journals Numerical Simulation on Structure Optimization of Liquid-Gas Cylindrical Cyclone Separator

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Peng Chang ◽  
Tian Hu ◽  
Li Wang ◽  
Sen Chang ◽  
Tianjing Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Gas Phase ◽  
Separation Efficiency ◽  
Three Dimensional ◽  
Industrial Process ◽  
Reynolds Stress Model ◽  
Mixture Flow ◽  
Cylindrical Cyclone ◽  
Further Development ◽  
Essential Problem

With the further development of oilfield, liquid-gas separation has become an essential problem. Cylindrical cyclone separators are popular in the industrial process due to the advantage that they are simple, compact, and inexpensive to manufacture. In this paper, a three-dimensional turbulence model including Reynolds stress model was established to describe the mixture flow field in the separator. Through the numerical simulation, the separation efficiency was investigated under different parameter cases such as separator length, gas phase outlet diameter, and inlet shape. It can be indicated from the simulation results that the separation efficiency decreases with the increase of the separator length, and the separation efficiency increases firstly and then decreases with the increase of the gas phase outlet diameter as well as the liquid phase outlet. Furthermore, the rectangular inlet is more suitable than the circular inlet with the separation efficiency changing from 66.45% to 79.04%. In the end, the optimal geometrical structure was presented with separation efficiency of 86.15%.

scholarly journals Feasibility Study on Downhole Gas–Liquid Separator Design and Experiment Based on the Phase Isolation Method

2021 ◽  
Vol 11 (21) ◽  
pp. 10496
Author(s):  
Yuntong Yang ◽  
Zhaoyu Jiang ◽  
Lianfu Han ◽  
Wancun Liu ◽  
Xingbin Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Gas Phase ◽  
Separation Efficiency ◽  
Dynamic Test ◽  
Phase Flow ◽  
Total Flow ◽  
Total Flow Rate ◽  
Two Phase ◽  
Oil Gas ◽  
Liquid Separator

As oil exploitation enters its middle and late stages, formation pressure drops, and crude oil degases. In production profile logging, the presence of the gas phase will affect the initial oil–water two-phase flowmeter’s flow measurement results. In order to eliminate gas-phase interference and reduce measurement costs, we designed a downhole gas–liquid separator (DGLS) suitable for low flow, high water holdup, and high gas holdup. We based it on the phase isolation method. Using a combination of numerical simulation and fluid dynamic measurement experiments, we studied DGLS separation efficiency separately in the two cases of gas–water two-phase flow and oil–gas–water three-phase flow. Comparative analysis of the numerical simulation calculation and dynamic test results showed that: the VOF model constructed based on k−ε the equation is nearly identical to the dynamic test, and can be used to analyze DGLS separation efficiency; the numerical simulation results of the gas–water two-phase flow show that when the total flow rate is below 20 m3/d, the separation efficiency surpasses 90%. The oil–gas–water three-phase’s numerical simulation results show that the oil phase influences separation efficiency. When the total flow rate is 20 m3/d–50 m3/d and gas holdup is low, the DGLS’s separation efficiency can exceed 90%. Our experimental study on fluid dynamics measurement shows that the DGLS’s applicable range is when the gas mass is 0 m3/d~15 m3/d, and the water holdup range is 50%~100%. The research presented in this article can provide a theoretical basis for the development and design of DGLSs.

Coupled 3-D CFD-DDPM Numerical Simulation of Turbulent Swirling Gas-Particle Flow Within Cyclone Suspension Preheater of Cement Kilns

2016 ◽  
Author(s):  
Eugen-Dan Cristea ◽  
Pierangelo Conti
Keyword(s):  
Numerical Simulation ◽  
Collection Efficiency ◽  
Three Dimensional ◽  
Predictive Performance ◽  
Reynolds Stress Model ◽  
General Purpose ◽  
Cement Kiln ◽  
Discrete Phase Model ◽  
Ansys Fluent ◽  
Cement Kilns

The paper presents a three-dimensional (3-D), time-dependent Euler-Lagrange multiphase approach for high-fidelity numerical simulation of strongly swirling, turbulent, heavy dust-laden flows within large-sized cyclone separators, as components of the state-of-art suspension preheaters (SPH) of cement kilns. The case study evaluates the predictive performance of the coupled hybrid 3-D computational fluid dynamics–dense discrete phase model (CFD-DDPM) approach implemented into the commercial general purpose code ANSYS-Fluent R16.2, when applied to industrial cyclone collectors used to separate particles from gaseous streams. The gas (flue gases) flow is addressed numerically by using the traditional CFD methods to solve finite volume unsteady Reynolds-averaged Navier-Stokes (FV-URANS) equations. The multiphase turbulence is modeled by using an option of Reynolds stress model (RSM), namely dispersed turbulence model. The motion of the discrete (granular) phase is captured by DDPM methodology. The twin cyclones of SPH top-most stage have been analyzed extensively both for the overall pressure drop and global collection efficiency, and for the very complex multiphase flow patterns established inside this equipment. The numerical simulation results have been verified and partially validated against an available set of typical industrial measurements collected during a heat and mass balance (H&MB) of the cement kiln.

scholarly journals Numerical Simulation of the Flow Through the Return Channel of Multi-Stage Centrifugal Compressors

1998 ◽  
Author(s):  
L. J. Lenke ◽  
H. Simon
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Reynolds Stress Model ◽  
Secondary Flows ◽  
Low Flow ◽  
Load Range ◽  
Design Point ◽  
Multi Stage ◽  
Return Channel

The numerical simulation of the flow within a return channel is reported in this paper. The investigated return channel is typically to join the exit from one stage of a centrifugal machine to the inlet of the next stage. These channel covers the range of extremely low flow coefficients. Different 3-D calculations with two different turbulence models (low-Reynolds-number k-ϵ and explicit algebraic Reynolds stress model) at the design point and part load range show the strongly three-dimensional flow structure with secondary flows on hub and shroud of the deswirl vanes. There are also significant separations downstream of the 180°-bend at suction and pressure side of the vanes. The presented numerical results are compared with experimental data in different planes and at the vane contour. The results indicate small differences between the turbulence models in the prediction of losses, flow angles and separation behavior at design point. At off-design conditions the turbulence models begin to deviate notably in their prediction of separation.

Three Dimensional Numerical Simulation of Solid-Liquid Separation of Horizontal Spiral Sedimentation Centrifuge

2013 ◽  
Vol 634-638 ◽  
pp. 1655-1658
Author(s):  
Qiu Bo Huang ◽  
Qing Jie Liu ◽  
Sheng Ju Zang
Keyword(s):  
Numerical Simulation ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Liquid Separation ◽  
Sedimentation Centrifuge ◽  
Fluent Software ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
The Relationship

The separation efficiency, separation factor, flow and other parameters are closely related in terms of horizontal spiral sedimentation centrifuge. This article takes lwb350 horizontal spiral sedimentation centrifuge for example, with the help of FLUENT software, the relationship among the separation efficiency and the working speed as well as feed flow is analyzed through the numerical simulation of solid-liquid separation, which can provide reference for the application of simulation analysis and research on properties of spiral centrifuge.

Numerical Simulation of a Gas-Liquid Cylindrical Cyclone

2012 ◽  
Vol 516-517 ◽  
pp. 1058-1061 ◽  
Author(s):  
Ming Hu Jiang ◽  
Zhen Wang ◽  
Jia Li You ◽  
Li Xin Zhao
Keyword(s):  
Pressure Drop ◽  
Gas Phase ◽  
Pressure Field ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Distribution Characteristics ◽  
Cylindrical Cyclone ◽  
Computational Fluid Dynamics Cfd ◽  
Inlet Position ◽  
High Separation

Inner flow field, pressure field and gas phase concentration of the gas-liquid cylindrical cyclone (GLCC) was studied and simulated with a Fluent soft pack by means of Computational Fluid Dynamics (CFD). Distribution characteristics of pressure drop and velocity field of the GLCC reveal that the inlet position and the outlet diameter of overflow can affect its separation performance. Low pressure drop and high separation efficiency can be obtained by designing the inlet position and the overflow tube diameter.

Numerical Simulation of Flow Field and Separation Efficiency of Inclined Cut-In Double-Inlet Cyclone

2012 ◽  
Vol 184-185 ◽  
pp. 341-347
Author(s):  
Cai Jin Wu ◽  
Zheng Fei Ma ◽  
Yong Yang
Keyword(s):  
Numerical Simulation ◽  
Pressure Drop ◽  
Flow Field ◽  
Axial Velocity ◽  
Separation Efficiency ◽  
Tangential Velocity ◽  
Reynolds Stress Model ◽  
Stress Model ◽  
Three Dimension ◽  
Inclined Angle

The three-dimension flow field and the separation efficiency of the inclined cut-in double-inlet cyclone were simulated numerically with Reynolds Stress Model (RSM). Numerical results show that the flow field nonsymmetry is improved in the inclined cut-in double-inlet cyclone and the swirl in the flow field was decreased greatly compared to that in the single-inlet cyclone. With the increase of inclined angle, both the tangential velocity and the axial velocity first increase and then decrease, reaching a peak at inclined 12 ° angle and at inclined 10 ° angle, respectively. The pressure drop in the inclined cut-in double-inlet cyclone increases first and then decreases with the increase of inclined angle, reaching a maximum far lower than that in the single-inlet cyclone, while the change of the radial velocity is not obvious. The separation efficiency of the inclined cut-in double-inlet cyclone could be effectively improved and the optimum inclined angle is 10 °.

Flow Structure of New Quick-Contact Cyclone Reactor

2011 ◽  
Vol 396-398 ◽  
pp. 1055-1058 ◽  
Author(s):  
Yi Ma ◽  
Zhen Bo Wang ◽  
You Hai Jin
Keyword(s):  
Flow Structure ◽  
Gas Flow ◽  
Separation Efficiency ◽  
Three Dimensional ◽  
Reynolds Stress Model ◽  
Heat Transfer Process ◽  
Exhaust Pipe ◽  
Cracking Reaction ◽  
Mass And Heat Transfer ◽  
Catalytic Cracking Reaction

The gas flow structure of new quick-contact cyclone reactor was simulated by using Reynolds stress model of Computational Fluid Dynamics method. In preliminary work, it had been proved that the simulated results agreed well with the experimental results. The results show that: ⑴ in mixer region, the three-dimensional velocities of gas flow are very small and the vertical vortexes cover the most part of the mixer which could contribute to gas-solid mixing effect; ⑵ in separator region, the rotation intensity of gas flow is very strong through accelerating action of guided vanes. However, some vortexes exist near the entrance of exhaust pipe and dust hopper which is not conductive to separation efficiency. The results could play a directive role in mass and heat transfer process and catalytic cracking reaction in cyclone reactor.

Numerical Simulation of the Gas Phase of Cyclone-Separator Sand Trap Based on ICEM CFD and FLUENT

2013 ◽  
Vol 774-776 ◽  
pp. 321-325
Author(s):  
Yan Huang ◽  
Man Quan Zhao ◽  
Han Tao Liu
Keyword(s):  
Gas Phase ◽  
Wind Erosion ◽  
Separation Efficiency ◽  
Short Circuit ◽  
Reynolds Stress Model ◽  
Cyclone Separator ◽  
Sand Trap ◽  
Icem Cfd ◽  
The Impact ◽  
Ansys Workbench

This paper is based on Reynolds stress model and uses a very important tool called ICEM CFD,which is integrated in ANSYS Workbench to mesh the cyclone-separator sand trap. From the Hexahedral structured meshing and analysis of its internal gas movement of the cyclone-type sand trap, the results are shown that mesh quality meets the requirements of solver by using the advanced O-grid and Y meshing technology in the software of ICEM CFD. Moreover, the existence of the short-circuit flow and the secondary flow is proved in the analysis of speed of the gas phase in the cyclone-type sand trap. From the information above, optimize designers can chance the structure of the cyclone-type sand trap in order to improve the separation efficiency of the cyclone sand trap and then to provide more valuable parameters for assessing and analyzing the impact of stubble height and surface crop coverage on wind erosion.

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