Study on Numerical Simulation of Gas-Solid Erosion for Feed Type Tee

2017 ◽  
Author(s):  
Zhou Fang ◽  
Weiwei Hu ◽  
Deyu Liu ◽  
Guanghai Li
Keyword(s):  
Numerical Simulation ◽  
Service Life ◽  
Erosion Rate ◽  
Solid Particles ◽  
Phase Flow ◽  
Gas Velocity ◽  
Two Phase ◽  
Distribution Method ◽  
Air Blowing ◽  
Fluent Software

A series of numerical simulation about gas-solid erosion for feed type tee have been taken out. The gas-solid two phase flow was formed in the tee with the solid particles coming from the top of the tee pipes and air blowing from the left side. Tee pipes erosion situation was simulated by DPM model in Fluent software. The serious erosion location in the tee pipes was analyzed with different speeds of solid and air. The reasonable distribution method of the particle velocity and gas velocity was put forward and the particles were remained in the intermediate position of the pipes. So the collision with the wall was reduced, and the pipeline erosion rate was slowed down, in addition, the service life of pipes was prolonged.

Numerical Simulation of the Gas-Solid Two-Phase Flow in the Cement Precalciner Based on Fluent Software

2011 ◽  
Vol 255-260 ◽  
pp. 4232-4236 ◽  
Author(s):  
Ning Ning Xing ◽  
Wei Lin Zhao
Keyword(s):  
Velocity Vector ◽  
Structure Design ◽  
Solid Particles ◽  
Cement Plant ◽  
Phase Flow ◽  
Three Dimension ◽  
Two Phase ◽  
Turbulence Flow ◽  
Fluent Software ◽  
Coal Power

The flow of gas and solid particles in DD-precalciner in the cement plant with capacity of 5000t/d was studied by numerical calculation using Fluent software. The DD-precalciner includes four eccentric burners, two eccentric tertiary air ducts and four feed boxes. The standard k-ε model was proposed to simulate the three-dimension turbulence flow and the movement of solid particles was simulated by particle stochastic trajectory model. The speed contours and velocity vector of different sections as well as the trajectories of solid particles were calculated and analyzed. It indicates that the structure design of DD-precalciner can great improve the combustion of coal power and decomposition of CaCO3 particles.

scholarly journals Numerical Simulation of Elbow Erosion in Shale Gas Fields under Gas-Solid Two-Phase Flow

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3804
Author(s):  
Bingyuan Hong ◽  
Xiaoping Li ◽  
Yanbo Li ◽  
Yu Li ◽  
Yafeng Yu ◽  
...  
Keyword(s):  
Shale Gas ◽  
Erosion Rate ◽  
Two Phase Flow ◽  
Radius Of Curvature ◽  
Phase Flow ◽  
Gas Velocity ◽  
Two Phase ◽  
Shape Coefficient ◽  
Sand Particles ◽  
Gas Fields

Erosion is one of the most common forms of material failure and equipment damage in gas transmission pipelines. Shale gas fields use hydraulic fracturing whereby solid particles are often carried in the gas flow, and the pipeline is in a high-pressure state, which is more likely to cause erosion. The prediction of particle erosion regulation in gas-solid two-phase flow is an effective means to ensure the safe operation of shale gas fields. In this paper, an integrated CFD-DPM model is established to investigate the erosion of 90° elbow in a shale gas field under gas-solid two-phase flow, employing the realizable k-ε turbulence model, discrete phase model, and erosion rate prediction model. The reliability of the proposed numerical models is verified by comparing the predicted data with the experimental data. Moreover, the effects of six important factors on maximum erosion rate are analyzed, including gas velocity, mass flow rate of sand particles, particle diameter, shape coefficient of sand particles, pipeline diameter, elbow radius of curvature. Specifically, the results indicate that the gas velocity, mass flow rate and shape coefficient of sand particles are positively correlated with the maximum erosion rate, while the pipe diameter and the elbow radius of curvature are negatively correlated with the maximum erosion rate. A new correlation was developed, which included four dimensionless groups, namely Reynolds number, diameter ratio, density ratio and particle number. The correlation can be used to predict maximum corrosion rate of elbows. This work can provide data reference and theoretical basis for mitigating the erosion rate of pipelines and managing the integrity of gas pipelines.

Numerical Simulation of the Two-Phase Flow in a New Type Cyclone

2011 ◽  
Vol 201-203 ◽  
pp. 263-266 ◽  
Author(s):  
Ning Ning Xing ◽  
Wei Lin Zhao
Keyword(s):  
Numerical Simulation ◽  
Gas Flow ◽  
Particle Trajectory ◽  
Swirling Flow ◽  
Flow Characteristics ◽  
Cement Plant ◽  
Phase Flow ◽  
Two Phase ◽  
New Type ◽  
Fluent Software

A new type cyclone with oblique top, transitional volute chamber, eccentric inner cylinders and sloping outlet were designed and manufactured by numerical analysis, which had been applied to the five-stage preheater in the cement plant with the capacity of 5000t/d. To simulate the gas flow field and particle trajectory in cyclone, the Fluent software was used, and the RNG k-ε model and discrete random walk model were proposed. The flow characteristics of gas-solid two-phase were analyzed. It is found that the strongly swirling flow occurs in the new type cyclone, and the particles of raw meal can be more efficiently separated from the gas.

Study on Numerical Simulation of Gas-Solid Erosion for Horizontal Feed Pipe

2020 ◽  
Author(s):  
Weiwei Hu ◽  
Lichen Hu ◽  
Li Sun ◽  
Chengye Shen ◽  
Hu Chen
Keyword(s):  
Numerical Simulation ◽  
Feed Speed ◽  
Discrete Phase Model ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Distribution Method ◽  
Air Blowing ◽  
Discrete Phase ◽  
Particle Velocities ◽  
Inclined Pipes

Abstract The gas-solid two phase flow was formed in the catalyst conveying pipeline with the catalyst particles coming from the top of the inclined pipes and air blowing from one side of the horizontal feed pipe. The upper side of horizontal pipe was seriously eroded. The erosion situation of feed pipe was simulated by the Discrete Phase Model (DPM) in Fluent software. The simulation result was compared with the field pipeline, and the gullies on the upper side of the horizontal pipe were formed by the particles concentrating on the upper side of the horizontal pipe with the excessive gas phase velocity. The reasonable distribution method of velocity was put forward by grouping numerical simulation of different particle velocities and blowing velocities. The particles were remained in the intermediate position of the horizontal pipe to reduce the collision between particles and the pipe wall. Therefore, the erosion rate of the pipe was slowed down; in addition, the service life of pipeline was prolonged. The research results of this paper could be used to provide reasonable feed speed for the actual petrochemical feed pipe. The protection methods was put forward for the horizontal feed pipe. The safety of petrochemical enterprises were guaranteed.

Numerical Simulation Study of Wet Desulfurization in Demister in San-He Power Plant

2014 ◽  
Vol 675-677 ◽  
pp. 623-626
Author(s):  
Yi Zhang ◽  
Tong Wang ◽  
Jin Bao Zhang
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Pressure Drop ◽  
Droplet Diameter ◽  
Gas Velocity ◽  
Two Phase ◽  
Plate Spacing ◽  
Fluent Software ◽  
Import And Export ◽  
The Relationship

In order to use the demister more scientifically and rationally, the numerical simulation of gas-liquid two-phase flow was implemented in two dimensional demister blades by different combinations of parameters using FLUENT software. The relationship between either the pressure drop or demisting efficiency and these factors of droplet diameter, gas velocity and plate spacing in san-he power plant was obtained respectively. The simulation shows that: With the change of the droplets diameters and blades spacing, the import and export pressure drop almost have no change. But it will increase with the increasing of gas velocities; With the increasing of droplets diameters, the demisting efficiency is increasing rapidly; The demisting efficiency increases with the increasing of gas velocities and decreases with the increasing of blades spacing.Keywords: Numerical Simulation, droplet diameter, gas velocity, plate spacing.

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