A DNS study on effect of coal particle swelling due to devolatilization on pulverized coal jet flame

Muto, Masaya; Tanno, Kenji; Kurose, Ryoichi

doi:10.1016/j.fuel.2016.07.070

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…It also may influence Author's Post-print version. Article published in Fuel: DOI: 10.1016/j.fuel.2018.10.137 Published version: https://www.sciencedirect.com/science/article/pii/S0016236118318672 pulverized biomass particle size distribution in the flame as this is the case for coal [41]. Nevertheless, the overall implications of replacing spherical particle models with spheroid particle models are in need for further studies under reactive conditions, which is the next step of our research.…”

Section: Figmentioning

confidence: 99%

Eulerian-Lagrangian simulation of pulverized biomass jet using spheroidal particle approximation

Guo

Zhao

et al. 2019

Fuel

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Pulverized biomass has great potential to replace coal in the many industrial systems such as suspensionfiring furnace and entrained-flow gasifier. The shape of pulverized biomass deviates significantly from the quasi-spherical coal particle. However, it is common to simulate pulverized biomass particles as spheres as most biomass models are developed based on coal models. With the aim to obtain a more realistic simulation of pulverized biomass, this work extends the treatment of pulverized biomass to spheroids. A spheroid model that accounts for spheroidal particle drag force and torque is implemented into an Eulerian-Lagrange computational fluid dynamic solver. Comprehensive verifications and validations are performed by comparing with experiments and direct numerical simulations.Furthermore, non-reactive simulations of a lab-scale entrained flow gasifier are carried out using both the conventional spherical particle model, simplified non-sphere model, and the implemented detailed spheroidal particle model. By studying the simulation results of particle and fluid velocities in axial, radial and tangential directions, differences are observed when comparing the sphere model, the simplified non-sphere model, and the spheroid model. The spheroid model also indicates that particle orientation, which is ignored in the sphere model and the simplified non-sphere model, plays a role in the behavior of the particle dynamics. It is also found that, under such conditions, the spheroid model, compared to the sphere model, yields a more dispersed distribution regarding the particle residence time and local concentration. These non-reactive simulation results imply that shortcomings may exist in the common practice of simulating conversion of pulverized biomass in which the sphere model or the simplified non-sphere model is applied.

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Section: Figmentioning

confidence: 99%

Eulerian-Lagrangian simulation of pulverized biomass jet using spheroidal particle approximation

Guo

Zhao

et al. 2019

Fuel

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“…Further effects that could lead to coal swelling or shrinking (e.g. breakage) are ignored based on similar reasoning as in 46 where a comparable case was studied. A single kinetic rate is applied to describe devolatilisation…”

Section: Coal Submodels and Chemistrymentioning

confidence: 99%

“…The coal particle density is assumed to remain constant during combustion, so the mass release due to pyrolysis will result in (mild) particle shrinking. Further effects that could lead to coal swelling or shrinking (e.g., breakage) are ignored based on similar reasoning, as in ref where a comparable case was studied. A single kinetic rate is applied to describe devolatilization where m p,vol is the volatile mass remaining in the coal particle.…”

Section: Modelingmentioning

confidence: 99%

Analysis of Gas-Assisted Pulverized Coal Combustion in Cambridge Coal Burner CCB1 Using FPV-LES

et al. 2020

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“…Many scholars have studied the combustion process of boilers with different sizes and different combustion modes by numerical simulation. Reynolds-averaged Navier-Stokes simulation (RANS) [4,5] , large-eddy simulation (LES) [5][6][7] and direct numerical simulation(DNS) [8,9] were used to study coal combustion. The results show that reliable results can be obtained by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation study on the influence of pulverized coal particle size on boiler combustion characteristics

Cheng

Zhang

2020

E3S Web Conf.

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The influence of pulverized coal particle size on combustion and NOx formation of 660MW tangential combustion ultra-supercritical boiler in a power plant was studied by using commercial software FLUENT. The average particle size of pulverized coal was set at 61μm, 71μm and 80μm, respectively. The results show that with the decrease of pulverized coal particle size, the overall temperature level of the boiler increases, the average temperature of the main combustion zone increases, the temperature of the upper part of the main combustion zone decreases, and the combustion of pulverized coal is more incomplete. However, the probability of particles sticking to the wall and the probability of coking and slagging of the boiler increases. The amount of NOx produced in the main combustion zone decreases, while the amount of NOx produced in the upper part of the main combustion zone increases, while the overall amount of NOx produced increases slightly.

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A DNS study on effect of coal particle swelling due to devolatilization on pulverized coal jet flame

Cited by 17 publications

References 16 publications

Eulerian-Lagrangian simulation of pulverized biomass jet using spheroidal particle approximation

Eulerian-Lagrangian simulation of pulverized biomass jet using spheroidal particle approximation

Analysis of Gas-Assisted Pulverized Coal Combustion in Cambridge Coal Burner CCB1 Using FPV-LES

Numerical simulation study on the influence of pulverized coal particle size on boiler combustion characteristics

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