scholarly journals CFD simulation on the gasification of asphalt water slurry in an entrained flow gasifier

2014 ◽  
Vol 11 (2) ◽  
pp. 308-317 ◽  
Author(s):  
Xingying Lan ◽  
Hanbin Zhong ◽  
Jinsen Gao
Keyword(s):  
Cfd Simulation ◽  
Entrained Flow ◽  
Water Slurry ◽  
Entrained Flow Gasifier

Prediction and Validation of Performance of an Entrained Flow Gasifier Model

2011 ◽  
Author(s):  
Arnab Roy ◽  
Srinath V. Ekkad ◽  
Uri Vandsburger
Keyword(s):  
Particle Deposition ◽  
Cfd Simulation ◽  
Particle Surface ◽  
Model Parameters ◽  
Discrete Phase Model ◽  
Improve Design ◽  
Entrained Flow ◽  
Gasification Process ◽  
Coal Particles ◽  
Entrained Flow Gasifier

Computational fluid dynamics (CFD) simulation of a single stage, dry-feed entrained flow gasifier is carried out to predict several physical and chemical processes within the gasifier. The model is developed using a commercial software package FLUENT. The CFD model is based on an Eulerian-Lagrangian framework, where the continuous fluid phase is modeled in Eulerian approach and the particle flow trajectory is simulated in Lagrangian frame. The two phases are coupled by appropriate source terms in the conservation equations. The gasification process can be divided into the following sub-processes, which are inert heating, moisture release, coal devolatilization, char gasification and gas phase reactions. Discrete Phase Model (DPM) is used to model the coal particles and coupled with heterogeneous particle surface reactions in Species Transport module. The interaction between reaction chemistry and turbulence is described by Finite-rate/Eddy dissipation model. The simulation provides detailed information of temperature field and species concentration profile inside the gasifier. The temperature distribution clearly indicates the three different reaction zones for devolatilization, gasification and reduction. Steady state model predictions are compared with benchmark experimental data from literature. The trend of the predicted species mole fraction distribution is in good agreement within error bound of the experiment. The model thus provides a validated set of model parameters along with an insight to the underlying flow physics and chemical reactions of gasification process that can be employed to improve design of experiments. This study also develops the basis to achieve further accuracy incorporating complex effects such as detailed reaction kinetic mechanisms, proper devolatilization models, effect of ash-slag transition and particle deposition.

Numerical Simulation of Industrial Opposed Multiburner Coal–Water Slurry Entrained Flow Gasifier

2012 ◽  
Vol 51 (6) ◽  
pp. 2560-2569 ◽  
Author(s):  
Zhonghua Sun ◽  
Zhenghua Dai ◽  
Zhijie Zhou ◽  
Qinghua Guo ◽  
Guangsuo Yu
Keyword(s):  
Numerical Simulation ◽  
Entrained Flow ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Entrained Flow Gasifier

Slag properties of blending coal in an industrial OMB coal water slurry entrained-flow gasifier

2014 ◽  
Vol 86 ◽  
pp. 683-688 ◽  
Author(s):  
Qinghua Guo ◽  
Zhijie Zhou ◽  
Fuchen Wang ◽  
Guangsuo Yu
Keyword(s):  
Entrained Flow ◽  
Water Slurry ◽  
Slag Properties ◽  
Coal Water Slurry ◽  
Entrained Flow Gasifier

Computational Fluid Dynamics Modeling of the Cold Condition Characteristic in an Entrained Flow Gasifier

2014 ◽  
Vol 875-877 ◽  
pp. 1225-1229
Author(s):  
Zhi Qiang Wu ◽  
Shu Zhong Wang ◽  
Lin Chen ◽  
Jun Zhao ◽  
Hai Yu Meng
Keyword(s):  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Injection Velocity ◽  
Dynamics Modeling ◽  
Mixing Condition ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Cold Condition ◽  
Entrained Flow Gasification ◽  
Gasification Technology

Entrained flow gasification technology has been attracted by gasifier researchers and companies for its wide-ranging feedstock adaptability and commercial scale availability. The optimization of the entrained flow gasifier is the critical thing for the development of entrained flow gasification technology. This paper presented a three-dimensional computational fluid dynamic (CFD) simulation for a better understanding of the cold condition flow characteristic in an entrained flow gasifier. The spraying angle, diameter and injection velocity of nozzles were found to observably affect the velocity distribution and mixing condition in the entrained flow gasifier. The numerical results could provide useful information for further research on the particle track and gasification reaction and an effective process for optimizing the gasifier and nozzle.

Visualization study on breakup modes of coal water slurry in an impinging entrained-flow gasifier

Fuel ◽  
2019 ◽  
Vol 244 ◽  
pp. 40-47 ◽  
Author(s):  
Zhicun Xue ◽  
Yan Gong ◽  
Qinghua Guo ◽  
Fuchen Wang ◽  
Guangsuo Yu
Keyword(s):  
Entrained Flow ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Entrained Flow Gasifier

Numerical Simulation of the Swirl Flow Effect on the Cold Condition Characteristic of Entrained Flow Gasifier

2012 ◽  
Vol 524-527 ◽  
pp. 1943-1946
Author(s):  
Zhi Qiang Wu ◽  
Shu Zhong Wang ◽  
Lin Chen ◽  
Jun Zhao ◽  
Hai Yu Meng
Keyword(s):  
Numerical Simulation ◽  
Flow Characteristic ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Scale Up ◽  
Swirl Flow ◽  
Injection Velocity ◽  
Cold Flow ◽  
Entrained Flow ◽  
Entrained Flow Gasifier

The swirl flow could enhance the turbulent mixing and promote the slagging in the entrained flow gasifier. In recent research, the effect of swirl flow on cold flow characteristic of entrained flow gasifier was neglected or simplified. To address this, a three-dimensional computational fluid dynamic (CFD) simulation was presented to investigate the effect of swirl flow on the cold flow characteristic of entrained flow gasifier. Several control parameters, i.e., the diameter and injection velocity of nozzles, were found to significantly affect swirl intensity and velocity distribution in the entrained flow gasifier. Our numerical simulation provides an effective way for researchers or engineers to optimize and scale up the gasifier and nozzle.

In-situ atomization and flame characteristics of coal water slurry in an impinging entrained-flow gasifier

2018 ◽  
Vol 190 ◽  
pp. 248-259 ◽  
Author(s):  
Zhicun Xue ◽  
Qinghua Guo ◽  
Yan Gong ◽  
Yifei Wang ◽  
Guangsuo Yu
Keyword(s):  
Entrained Flow ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Entrained Flow Gasifier
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