scholarly journals Modeling of calcium-based sorbent reactions with sulfur dioxide

2015 ◽  
Vol 80 (4) ◽  
pp. 549-562 ◽  
Author(s):  
Ivan Tomanovic ◽  
Srdjan Belosevic ◽  
Aleksandar Milicevic ◽  
Dragan Tucakovic
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Sulfur Dioxide ◽  
Numerical Simulations ◽  
Coal Combustion ◽  
Complex Geometry ◽  
Particle Flow ◽  
Numerical Code ◽  
Pulverized Coal Combustion ◽  
Spherical Grains

A mathematical model of calcium sorbent reactions for simulation of sulfur dioxide reduction from pulverized coal combustion fl e gasses is developed, implemented within numerical code and validated against available measurements under controlled conditions. The model attempts to closely resemble reactions of calcination, sintering and sulfation, occurring during the sorbent particles motion in the furnace. The sulfation is based on PSSM (Partially Sintered Spheres Model), coupled with simulated particle calcination and sintering. Complex geometry of the particle is taken into account, with the assumption that it consists of spherical grains in contact with each other. Numerical simulations of drop down tube reactors were performed for both CaCO3 and Ca(OH)2 sorbent particles and results were compared with available experimental data from literature. The sorbent reactions model will be further used for simulations of desulfurization reactions in turbulent gas-particle flow under coalcombustion conditions.

scholarly journals Numerical Simulations of Pulverized Coal Combustion

2009 ◽  
Vol 27 (0) ◽  
pp. 144-156 ◽  
Author(s):  
Ryoichi Kurose ◽  
Hiroaki Watanabe ◽  
Hisao Makino
Keyword(s):  
Numerical Simulations ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion

scholarly journals Numerical Modeling of Combustion and Detonation in Aqueous Foams

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6233
Author(s):  
Alexey Kiverin ◽  
Ivan Yakovenko
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Numerical Modeling ◽  
Numerical Simulations ◽  
Recent Experimental Data ◽  
Flame Acceleration ◽  
Aqueous Foam ◽  
Aqueous Foams ◽  
Transition To Detonation ◽  
Reactive Gas

Combustible aqueous foams and foamed emulsions represent prospective energy carriers. This paper is devoted to the overview of model assumptions required for numerical simulations of combustion and detonation processes in aqueous foams. The basic mathematical model is proposed and used for the analysis of the combustion development in the wet aqueous foam containing bubbles filled with reactive gas. The numerical results agree with the recent experimental data on combustion and detonation in aqueous foams containing premixed hydrogen–oxygen. The obtained results allowed for distinguishing the mechanisms of flame acceleration, transition to detonation, detonation propagation, and decay.

CFD Modeling of Pulverized Coal Combustion in an Industrial Burner

2012 ◽  
Author(s):  
Marco Torresi ◽  
Bernardo Fortunato ◽  
Sergio Mario Camporeale ◽  
Alessandro Saponaro
Keyword(s):  
Experimental Data ◽  
Coal Combustion ◽  
Three Dimensional ◽  
Full Scale ◽  
Pulverized Coal ◽  
Cfd Modeling ◽  
Navier Stokes ◽  
Second Phase ◽  
Pulverized Coal Combustion ◽  
Char Burnout

The accurate prediction of pulverized coal combustion in industrial application still remains a great challenge. This is mainly due to the lack of high quality experimental data acquired during the operation of industrial plants. This work describes the CFD model used in order to numerically simulate the pulverized coal combustion of a full scale, swirl stabilized, aerodynamically staged, industrial burner. In particular, two different combinations of devolatilization and char burnout models were investigated comparing the numerical results with available experimental data obtained during a burner test carried out, in full-scale configuration, in a 50 MWth, fully instrumented, test rig. In order to avoid any unrealistic assumption on pulverized coal distribution at the burner inlet, the entire primary air duct for pulverized coal transportation has been considered. The main flow is computed solving the steady, incompressible, three-dimensional, Reynolds Averaged Navier-Stokes (RANS) equations, whereas the pulverized coal is simulated as a reacting discrete second phase in a Lagrangian frame of reference, computing the trajectories of the discrete phase entities, as well as heat and mass transfer. The numerical analysis confirms the very good burner performance obtained during the tests with a very low percentage of fixed carbon left in the ashes.

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