scholarly journals Development of Euler-Lagrangian Simulation of a Circulating Fluidized Bed Reactor for Coal Gasification

2019 ◽  
pp. 45 ◽  
Author(s):  
D. Tokmurzin ◽  
D. Adair
Keyword(s):  
Experimental Data ◽  
Fluidized Bed ◽  
Coal Gasification ◽  
Circulating Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Reaction Rates ◽  
Gas Composition ◽  
Particle In Cell ◽  
Lagrangian Simulation ◽  
Gasification Process

A Computational Particle Fluid Dynamics (CPFD) model based on the Multiphase Particle in Cell (MP-PIC) approach is used for Shubarkol coal gasification simulation in an atmospheric circulating fluidized bed reactor. The simulation is developed on a basis of experimental data available from a biomass gasification process. The cross-section diameter of the reactor riser is 200 mm and the height is 6500 mm. The Euler-Lagrangian simulation is validated using experimental data available in the literature and also compared with an Euler-Euler simulation. The gasification reactions kinetics model is improved, and homogenous and heterogeneous chemistry are described by reduced-chemistry, with the reaction rates solved numerically using volume-averaged chemistry. The simulations reveal gas composition, temperature, and pressure interdependencies along the height of the reactor. The product gas composition compares well with the experiment and the temperature profile demonstrate good consistency with the experiment. The developed model is used for a case study of Shubarkol coal gasification in the circulating fluidized bed reactor.

Towards a hybrid Eulerian–Lagrangian CFD modeling of coal gasification in a circulating fluidized bed reactor

Fuel ◽  
2015 ◽  
Vol 152 ◽  
pp. 131-137 ◽  
Author(s):  
Adam Klimanek ◽  
Wojciech Adamczyk ◽  
Anna Katelbach-Woźniak ◽  
Gabriel Węcel ◽  
Andrzej Szlęk
Keyword(s):  
Fluidized Bed ◽  
Coal Gasification ◽  
Circulating Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Cfd Modeling

Mathematical Modeling of Coal Gasification in a Fluidized Bed Reactor Using a Eulerian Granular Description

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Pablo Cornejo ◽  
Oscar Farías
Keyword(s):  
Experimental Data ◽  
Gas Phase ◽  
Fluidized Bed ◽  
Coal Gasification ◽  
Solid Phase ◽  
Heterogeneous Reaction ◽  
Mass Conservation ◽  
Reaction Rates ◽  
Reaction Model ◽  
Mixing Rate

A three-dimensional computational model was developed to describe the coal-gasification processes inside fluidized-bed reactors. The commercial multi-purpose CFD code FLUENT 6.3 was employed, taking into account drying, volatilization, combustion and gasification processes. Both gas phase and solid phase were described using a eulerian approach to model the exchanges of mass, energy and momentum between phases. The disperse phase was described using the kinetic theory of granular flows. The chemical model involved five heterogeneous and five homogeneous chemical reactions, tracking seven species in the gas phase (CO2, CO, H2O, CH4, H2, O2 and N2) and one specie in the solid phase (C(s)). Drying and volatilization rates were estimated by mass conservation. Heterogeneous reaction-rates were determined by combining an Arrhenius kinetic-rate and a diffusion rate using the kinetics/diffusion Surface Reaction Model; the model was implemented within FLUENT through UDFs (User Defined Functions). Homogeneous reaction-rates were described by a turbulent mixing rate using the Eddy Dissipation Model available in FLUENT. Calibration and validation were performed by using existing experimental data from a benchmark coal-gasification case available in the literature. Results are in good agreement with experimental data, capturing known phenomena like fluidization-bed height, temperature distribution and species concentrations. The main contribution of the present work was implementing the necessary sub-models within the FLUENT code in order to handle reactive fluidized-beds in complex geometries. This allowed combining the flexibility of a commercial CFD code with the accuracy of simplified models developed in academic frameworks.

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