Predictions of coal combustion and desulfurization in a CFB riser reactor by kinetic theory of granular mixture with unequal granular temperature

Wang, Shuai; Chen, Juhui; Liu, Guodong; Huilin, Lu; Zhao, Feixiang; Zhang, Yanan

doi:10.1016/j.fuproc.2014.04.033

Cited by 19 publications

(10 citation statements)

References 35 publications

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“…Some main parameters used in the simulation are shown in Table 2. The selection of restitution coefficients is referred from [32,52,53]. The proximate analysis and ultimate analysis of coal and biomass (woodchips) are shown in Table 3.…”

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

“…, , and are the diffusion coefficient for particle phase, the dissipation rate caused by particle inelastic collision, and kinetic energy exchange between gas and particles, respectively. The detailed derivation for KTGF of binary granular mixture model is given in [30,32] .…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

“…Hence, Lu et al [30,31] extended the KTGF model to a binary granular mixture with different granular temperatures by means of the Maxwell distribution. Wang et al [32] simulated combustion and desulfurization processes in CFB with various particle size/density (coal/limestone) using the KTGF model with different granular temperatures. It is obvious that the flow and combustion characteristics of fuel are greatly affected by the particle size and density [33].…”

Section: Introductionmentioning

confidence: 99%

“…The assumption of average density and particle size limits the accuracy of simulations [21,32]. Therefore, it is necessary to establish a model of coal and biomass cofiring in FB with different particle size and density.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres

Chen

Zhao

2018

Journal of Combustion

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A 2D dynamic model for a bubbling fluidized bed (BFB) combustor has been developed for simulating the coal and biomass cofiring process under 21% O 2 /79% CO 2 atmosphere in a 6 kWth bubbling fluidized bed, coupled with the Euler-Euler two-phase flow model. The kinetic theory of binary granular mixtures is employed for the solid phase in order to map the effect of particle size and density. The distribution of temperature, volume fraction, velocity, gas species concentration, and reaction rates are studied with numerical calculations. The simulated temperature distribution along the height of the combustor and outlet gas concentrations show good agreement with experimental data, validating the accuracy and reliability of the developed cofiring simulation model. As indicated in the results, there are two high temperature zones in the combustor, which separately exist at the fuel inlet and dilute phase. The reaction rates are related to the species concentration and temperature. The higher concentration and temperature lead to the larger reaction rates. It can be seen that all of the homogeneous reaction rates are larger at the fuel inlet region because of rich O 2 and volatiles. High mass fraction of volatile gas is found at the fuel inlet, and the main reburning gas at the dilute phase is CH 4 . The mass fraction distribution of CO is related to the volume fraction of fuel which is due to the fact that the source of CO is not only from the devolatilization but also from the gasification. On the basis of this theoretical study, a better understanding of flow and combustion characteristics in biomass and coal cofiring under oxy-fuel atmospheres could be achieved.

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Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

Section: Hydrodynamic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres

Chen

Zhao

2018

Journal of Combustion

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“…More comprehensive algorithms which account for devolatilization and chemical reactions of fuel particles in a bed that includes an inert phase are reported in [33,52,72,74,82]. Fuel particles, however, are represented as having a single diameter.…”

Section: Introductionmentioning

confidence: 99%

The effect of particle polydispersion in a gasifier bed dynamics using Eulerian-Eulerian models

Cubero

Sánchez-Insa

Fueyo

2020

Fuel Processing Technology

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The influence of the coal particle size distribution on the performance of a fluidized bed gasifier is investigated by means of a multiphase Eulerian-Eulerian model embodied in the Open-FOAM CFD code. To distinguish the effects of combustion from those of particle segregation we compare the solutions obtained by modeling of solids as, alternatively, monodispersed or polydispersed particles; and as reactive or inert ones. Results reveal that the preferential motion of the smaller particles towards the bed top significantly delays char consumption at the bottom layers, favors volatile oxidation, and results in a more uneven lateral distribution of the off-gas.

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Computational fluid dynamics of sulfur dioxide and carbon dioxide capture using mixed feeding of calcium carbonate/calcium oxide in an industrial scale circulating fluidized bed boiler

et al. 2019

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Predictions of coal combustion and desulfurization in a CFB riser reactor by kinetic theory of granular mixture with unequal granular temperature

Cited by 19 publications

References 35 publications

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres

The effect of particle polydispersion in a gasifier bed dynamics using Eulerian-Eulerian models

Computational fluid dynamics of sulfur dioxide and carbon dioxide capture using mixed feeding of calcium carbonate/calcium oxide in an industrial scale circulating fluidized bed boiler

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Predictions of coal combustion and desulfurization in a CFB riser reactor by kinetic theory of granular mixture with unequal granular temperature

Cited by 19 publications

References 35 publications

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O2/CO2 Atmospheres

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O2/CO2 Atmospheres

The effect of particle polydispersion in a gasifier bed dynamics using Eulerian-Eulerian models

Computational fluid dynamics of sulfur dioxide and carbon dioxide capture using mixed feeding of calcium carbonate/calcium oxide in an industrial scale circulating fluidized bed boiler

Contact Info

Product

Resources

About

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres

Simulation of Coal and Biomass Cofiring with Different Particle Density and Diameter in Bubbling Fluidized Bed under O₂/CO₂ Atmospheres