Computational-Fluid-Dynamics-Based Evaluation and Optimization of an Entrained-Flow Gasifier Potential for Coal Hydrogasification

2013 ◽  
Vol 27 (11) ◽  
pp. 6397-6407 ◽  
Author(s):  
Linbo Yan ◽  
Boshu He ◽  
Xiaohui Pei ◽  
Chaojun Wang ◽  
Huaxin Liang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Entrained Flow ◽  
Entrained Flow Gasifier

scholarly journals Numerical simulation of lignocellulosic biomass gasification in concentric tube entrained flow gasifier through computational fluid dynamics

2019 ◽  
Vol 37 (3) ◽  
pp. 1073-1097 ◽  
Author(s):  
Ghulamullah Maitlo ◽  
Imran Nazir Unar ◽  
Rasool Bux Mahar ◽  
Khan Mohammad Brohi
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Gas Phase ◽  
Mole Fraction ◽  
Sugarcane Bagasse ◽  
Rice Husk ◽  
Reaction Rates ◽  
Entrained Flow ◽  
Cotton Stalks ◽  
Entrained Flow Gasifier

Thermochemical conversion of biomass is an encouraging way for the production of syngas. In the present research, four different biomass materials were used for gasification which includes rice husk, cotton stalks, sugarcane bagasse, and sawdust. These biomass sources were selected because they are common Pakistani feedstocks. Gasification of selected biomasses was performed using concentric tube entrained flow gasifier. Three-dimensional computational fluid dynamics model was used to investigate the impacts of kinetic rate and diffusion rate on the gasification performance. The Euler–Lagrange method was used for the development of entrained flow biomass gasifier using commercial computational fluid dynamics code ANSYS FLUENT®14. Discrete phase model was used to predict the movement of particles, whereas the gas phase was treated as the continuous phase with a standard k–ε turbulent model to predict the behavior of gas phase flow. Finite rate/Eddy dissipation model was applied for the calculation of homogenous and heterogeneous reaction rates. Oxygen was used as a gasifying agent. Cotton stalks and sugarcane bagasse produced higher mole fractions of hydrogen (H2) and carbon monoxide (CO) than sawdust and rice husk. Regarding carbon conversion efficiency, cold gas efficiency, and higher heating value cotton stalks and sugarcane bagasse produced better syngas quality as compared to sawdust and rice husk. The oxygen/fuel (O/F) ratio is a key operating parameter in the field of gasification and combustion. The O/F ratio above 0.42 favored combustion reactions and increased mole fraction of water vapor (H2O) and carbon dioxide (CO2) in syngas composition, whereas gasification reactions dominated below 0.42 O/F ratio, resulting increased mole fraction of H2 and CO in syngas composition.

scholarly journals Computational fluid dynamics analysis of char conversion in Sandia’s pressurized entrained flow reactor

2020 ◽  
Vol 91 (7) ◽  
pp. 074103
Author(s):  
Markus Bösenhofer ◽  
Ethan Hecht ◽  
Christopher R. Shaddix ◽  
Bernhard König ◽  
Johannes Rieger ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Reactor ◽  
Dynamics Analysis ◽  
Entrained Flow ◽  
Computational Fluid Dynamics Analysis ◽  
Entrained Flow Reactor ◽  
Char Conversion

Reaction Kinetics of Pressurized Entrained Flow Coal Gasification: Computational Fluid Dynamics Simulation of a 5 MW Siemens Test Gasifier

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Stefan Halama ◽  
Hartmut Spliethoff
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Reaction Kinetics ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Dynamics Simulation ◽  
Cfd Model ◽  
Entrained Flow ◽  
Conversion Rates ◽  
Entrained Flow Gasifiers

Modeling pressurized entrained flow gasification of solid fuels plays an important role in the development of integrated gasification combined cycle (IGCC) power plants and other gasification applications. A better understanding of the underlying reaction kinetics is essential for the design and optimization of entrained flow gasifiers—in particular at operating conditions relevant to large-scale industrial gasifiers. The presented computational fluid dynamics (CFD) simulations aim to predict conversion rates as well as product gas compositions in entrained flow gasifiers. The simulations are based on the software ansys fluent 15.0 and include several detailed submodels in user defined functions (UDF). In a previous publication, the developed CFD model has been validated for a Rhenish lignite against experimental data, obtained from a pilot-scale entrained flow gasifier operated at the Technische Universität München. In the presented work, the validated CFD model is applied to a Siemens test gasifier geometry. Simulation results and characteristic parameters, with focus on char gasification reactions, are analyzed in detail and provide new insights into the gasification process.

scholarly journals Computational fluid dynamics modelling of an entrained flow biomass gasifier

1998 ◽  
Vol 22 (10) ◽  
pp. 747-757 ◽  
Author(s):  
D.F. Fletcher ◽  
B.S. Haynes ◽  
J. Chen ◽  
S.D. Joseph
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Entrained Flow ◽  
Dynamics Modelling
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