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.

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 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.

Solid–liquid two-phase flow and erosion calculation of butterfly valves at small opening based on DEM method

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Benliang Xu ◽  
Zuchao Zhu ◽  
Zhe Lin ◽  
Dongrui Wang
Keyword(s):  
Peer Review ◽  
Two Phase Flow ◽  
Solid Particles ◽  
Phase Flow ◽  
Butterfly Valve ◽  
Two Phase ◽  
Content Type ◽  
Small Opening ◽  
Solid Liquid ◽  
The Impact

Purpose The study aims to decrease the effect of solid particles on a butterfly valve, which will cause seal failure and leakage, providing a reference for anti-wear design. Design/methodology/approach In this paper, computational fluid dynamics discrete element method (CFD-DEM) simulation was conducted to study the solid–liquid two-phase flow characteristics and erosion characteristics of a butterfly valve with a different opening. Findings Abrasion at 10% opening is affected by high-speed jets in upper and lower parts of the pipeline, where the erosion is intense. The impact of the jet on the upper part of 20% opening begins to weaken. With the top backflow vortex disappearing, the effect of lower jet is enhanced. Meanwhile, the bottom backflow vortex phenomenon is obvious, and the abrasion position moves downward. At 30% opening, the velocity is further weakened, and the circulation effect of lower flow channel is more obvious than that of the upper one. Originality/value It is the first time to use DEM to investigate the two-phase flow and erosion characteristics at a small opening of a butterfly valve, considering the effect of inter-particle collision. Therefore, this study carries on the thorough analysis and discussion. At the same opening degree, with increasing of the particle size, the abrasion of valve frontal surface increases when the size is less than 150 µm and decreases when it is greater than 150 µm. For the valve backflow surface, this boundary value becomes 200 µm. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0264/

Eulerian Three-Phase Flow Model Applied to Trickle-Bed Reactors

2014 ◽  
Vol 35 (1) ◽  
pp. 75-96 ◽  
Author(s):  
Andrzej Burghardt
Keyword(s):  
Fixed Bed ◽  
Solid Particles ◽  
Weighted Averaging ◽  
Phase Flow ◽  
Two Phase ◽  
Conservation Equations ◽  
Three Phase ◽  
Three Phase Flow ◽  
Reynolds Decomposition ◽  
Trickle Bed

Abstract The majority of publications and monographs present investigations which concern exclusively twophase flows and particulary dispersed flows. However, in the chemical and petrochemical industries as well as in refineries or bioengineering, besides the apparatuses of two-phase flows there is an extremely broad region of three-phase systems, where the third phase constitutes the catalyst in form of solid particles (Duduković et al., 2002; Martinez et al., 1999) in either fixed bed or slurry reactors. Therefore, the goal of this study is to develop macroscopic, averaged balances of mass, momentum and energy for systems with three-phase flow. Local instantaneous conservation equations are derived, which constitute the basis of the method applied, and are averaged by means of Euler’s volumetric averaging procedure. In order to obtain the final balance equations which define the averaged variables of the system, the weighted averaging connected with Reynolds decomposition is used. The derived conservation equations of the trickle-bed reactor (mass, momentum and energy balance) and especially the interphase effects appearing in these equations are discussed in detail.

Analysis of Pulverized Coal Combustion in Precalciner Based on Fluent Software

2014 ◽  
Vol 635-637 ◽  
pp. 40-43
Author(s):  
Li Long Dong ◽  
Wei Lin Zhao ◽  
Ning Ning Xing
Keyword(s):  
Coal Combustion ◽  
Energy Equation ◽  
Internal Flow ◽  
Decomposition Temperature ◽  
Pulverized Coal ◽  
Combustion Model ◽  
Pulverized Coal Combustion ◽  
Three Dimension ◽  
Turbulence Flow ◽  
Fluent Software

The pulverized coal combustion in precalciner in the cement plant with capacity of 5000t/d was investigated by numerical calculation using Fluent software. The standard k-ε model and particle stochastic trajectory model was proposed to simulate the three-dimension turbulence flow and pulverized coal movement respectively. The energy equation including P1 raditional model and non-premixed combustion model were applied to calculate the internal flow field of temperature and concentrations of volatile, CO, O2 and CO2. It indicates that the structure of precalciner is well designed and the pulverized coal can burn quickly after injecting from burners. The decomposition temperature that production needed is satisfied and the concentrations after combustion are accepted.

Numerical Study of Frictional Resistance in Vertical Helically Coiled Pipe

2013 ◽  
Vol 313-314 ◽  
pp. 1030-1033
Author(s):  
Shui Hua Zheng ◽  
Jie Gang Mu ◽  
Wen Can Fan
Keyword(s):  
Two Phase Flow ◽  
Numerical Study ◽  
Frictional Resistance ◽  
Phase Flow ◽  
Two Phase ◽  
Frictional Pressure Drop ◽  
Mass Transfer Theory ◽  
Flow Situation ◽  
Fluent Software ◽  
Good Support

Based on the heat and mass transfer theory and characteristics of the FLUENT software, a numerical simulation platform had been developed to study the heat exchange and flow situation of gas-liquid two-phase flow in vertical helically coiled pipe. The frictional resistance of gas-liquid two-phase flow in the pipe was investigated by this platform. The results show that frictional pressure drop is relatively small under high pressure condition and increases with the increasing gas quality. This platform could provide a good support for the design and research of vertical helically coiled pipe.

Two-Order Moment Trajectory Model of Two-Phase Turbulence Flow Based on Particle PDF Transport Equation

2014 ◽  
Vol 668-669 ◽  
pp. 318-321 ◽  
Author(s):  
Jiang Rong Xu ◽  
Lu Wang
Keyword(s):  
Transport Equation ◽  
Two Phase Flow ◽  
Statistical Characteristics ◽  
Order Moment ◽  
Phase Flow ◽  
Two Phase ◽  
Trajectory Model ◽  
Turbulence Flow

Based on the PDF transport equation of particle, a two-order moment trajectory model of particles (TOMTM) is proposed to obtain reasonable statistical characteristics of a two-phase flow. Using the method proposed by Risken, It is shown that TOMTM is just the solution of the particles PDF equation

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