scholarly journals Computational particle fluid dynamics simulation of biomass gasification in an entrained flow gasifier

2021 ◽  
pp. 100112
Author(s):  
Ramesh Timsina ◽  
Rajan K Thapa ◽  
Britt ME Moldestad ◽  
Marianne S Eikeland
Keyword(s):  
Fluid Dynamics ◽  
Biomass Gasification ◽  
Dynamics Simulation ◽  
Entrained Flow ◽  
Entrained Flow Gasifier

scholarly journals CPFD simulation on particle behaviour in an entrained-flow gasifier

Clean Energy ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 75-84
Author(s):  
Yongshi Liang ◽  
Cliff Y Guo ◽  
Xianglong Zhao ◽  
Qiang Qin ◽  
Yi Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Residence Time ◽  
Temperature Region ◽  
Recirculation Zone ◽  
Dynamics Simulation ◽  
Entrained Flow ◽  
Fast Reactions ◽  
Entrained Flow Gasifier ◽  
Gas Expansion ◽  
Entrained Flow Gasification

Abstract A computational particle fluid dynamics simulation model for entrained-flow gasification was established in this study. The simulation results agree with the experimental data. The detailed particle information and residence-time distribution were obtained by injecting particle tracers in the simulation. The results show that the particles in the gasifier can be classified into three flowing zones, i.e. a fast-flowing zone, a recirculation zone and a spreading zone. The criterion for this classification was also provided. The rapid gas expansion caused by the fast reactions plays a significant role in forming the particle stream into these three zones. It accelerates the particles in the centre of the gasifier while pushing the particles near the expansion edge into the gas recirculation. Also, the concentrated oxygen distribution in the gasifier results in the formation of high- and low-temperature regions. The particles in the fast-flowing zone flow directly through the high-temperature region and most of these particles in this zone were fully reacted with a short residence time. Since particles in the recirculation zone are in a relatively low-temperature region, most of these particles are not fully gasified, although with a long residence time. The rest of particles in the spreading zone show moderate properties between the above two zones.

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.

CFD Modeling of an Entrained Flow Gasifier

2013 ◽  
Vol 448-453 ◽  
pp. 1624-1627
Author(s):  
Xiao Yan Gao ◽  
Ya Ning Zhang ◽  
Bing Xi Li ◽  
Lu Dong
Keyword(s):  
Numerical Model ◽  
Biomass Gasification ◽  
Cfd Modeling ◽  
Cfd Model ◽  
Ansys Fluent ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Fluent Software ◽  
Relative Errors

A 2 D CFD model was established to simulate sawdust gasification in an entrained flow gasifier using Ansys Fluent software. Syngas composition, syngas yield and syngas LHV were evaluated. The simulated syngas compositions were in agreement with the experiment results. The relative errors of syngas yield and LHV varied in the ranges of 2-15% and 1-9%, respectively. The results showed that the numerical model established in this study can be applied to simulate biomass gasification in entrained flow gasifier.

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