Numerical simulations of coal gasification in a pressurized circulating fluidized bed reactor with carbon dioxide Symulacja numeryczna zgazowania węgla w ciśnieniowym reaktorze fluidyzacyjnym z użyciem ditlenku węgla

2017 ◽  
Vol 1 (3) ◽  
pp. 147-150
Author(s):  
Joanna Bigda
Keyword(s):  
Carbon Dioxide ◽  
Numerical Simulations ◽  
Fluidized Bed ◽  
Coal Gasification ◽  
Circulating Fluidized Bed ◽  
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

scholarly journals Simulation of circulating fluidized bed gasification for characteristic study of pakistani coal

2015 ◽  
Vol 17 (1) ◽  
pp. 66-78 ◽  
Author(s):  
Naveed Ramzan ◽  
Muhammad Athar ◽  
Sharmina Begum ◽  
Syed Waqas Ahmad ◽  
Shahid Naveed
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Fluidized Bed ◽  
Flow Rate ◽  
Coal Gasification ◽  
Circulating Fluidized Bed ◽  
Stoichiometric Ratio ◽  
Carbon Conversion ◽  
Heating Value ◽  
Coal Gasifier

Abstract A process model for turbulent pressurized circulating fluidized-bed coal gasifier is created using ASPEN PLUS software. Both hydrodynamic and reaction kinetics parameter are taken into account, whose expressions for fluidized bed are adopted from the literature. Various reactor models available in ASPEN PLUS with calculator as External Block are nested to solve hydrodynamics and kinetics. Multiple operational parameters for a pilot-plant circulating fluidized-bed coal gasifier are used to demonstrate the effects on coal gasification characteristics. This paper presents detailed information regarding the simulation model, including robust analysis of the effect of stoichiometric ratio, steam to coal ratio, gasification temperature and gasification agent temperature. It is observed that, with the increase in the flow rate of air, the components hydrogen, carbon monoxide, carbon dioxide and methane reduce, which causes the Lower Heating Value (LHV) of synthesis gas (Syn. Gas) to decrease by about 29.3%, while increment in the steam flow rate shows a minute increase in heating value of only 0.8%. Stoichiometric ratio has a direct relationship to carbon conversion efficiency and carbon dioxide production. Increasing the steam to coal ratio boosts the production of hydrogen and carbon monoxide, and causes a drop in both carbon dioxide concentration and the conversion efficiency of carbon. High gasifying agent temperature is desired because of high concentration of CO and H2, increasing carbon conversion and LHV. A high gasifying agent temperature is the major factor that affects the coal gasification to enhance H2 and CO production rapidly along with other gasification characteristics.

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.

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