DEM-LES simulation of coal combustion in a bubbling fluidized bed Part II: coal combustion at the particle level

ZHOU, H; Flamant, Gilles; Gauthier, Daniel J.

doi:10.1016/s0009-2509(04)00294-5

Cited by 98 publications

(38 citation statements)

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“…The particle shape is a complete sphere; thus, the particle is represented by its particle diameter. The dp of coke decreases relative to based on the carbon mass fraction using the shrinking core model, 25) and the dp of ore is assumed to be constant. In this study, each particle size was set as much as possible close to actual particle diameter.…”

Section: Solid Propertiesmentioning

confidence: 99%

Effect of High Reactivity Coke for Mixed Charge in Ore Layer on Reaction Behavior of Each Particle in Blast Furnace

et al. 2013

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A low coke rate operation in blast furnace is desired to decrease the carbon input and mitigate global warming problem. However, low coke rate operation tends to cause the gas permeability to deteriorate. The mixing of small-size coke (nut coke) including high reactivity coke in ore layer is considered to be a promising way to improve permeability and increase reaction efficiency in a blast furnace. Although adding a nut coke mixing to an ore layer is predicted to be empirically effective in low coke rate operation, there is little actual data on microscopic phenomena of each particle in the packed bed. In the present study, an Euler-Lagrange approach was introduced to precisely understand the influence of the packed bed structure on the reaction behavior of each particle in the three-dimensional particle arrangement.It was observed that the heterogeneity on the reaction rate and temperature distribution was influenced by the particle arrangement. When high-reactivity coke was used at approximately 1 273 K, although CO gas fraction increased, the gaseous phase temperature decreased due to the active solution loss reaction rate of the nut coke in the mixed layer. As a result, the ore reduction rate decreased. The contribution of high-reactivity coke to the ore reduction rate depends on the particle arrangement through the heat transfer and reaction heat. Accordingly, in the case of the mixed charge of the high reactivity nut coke in the ore layer, the design of the packed bed structure is important.

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Section: Solid Propertiesmentioning

confidence: 99%

Effect of High Reactivity Coke for Mixed Charge in Ore Layer on Reaction Behavior of Each Particle in Blast Furnace

et al. 2013

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“…In a specified enclosed cell, an environmental temperature is assumed to represent the enclosed surface temperature around such a particle. Thus, the equation used by Zhou et al (2004) is slightly modified to calculate the heat flux due to radiation using a local environmental temperature to replace the bed temperature, and is written as (Zhou et al, 2009) where σ is the Stefan-Boltzmann constant, equal to 5.67×10 -8 W/(m 2 ⋅K 4 ), and ε pi is the sphere emissivity. Gas radiation is not considered due to low gas emissivities.…”

Section: Radiative Heat Transfermentioning

confidence: 99%

Particle Scale Simulation of Heat Transfer in Fluid Bed Reactors

Zhou¹,

Hou²,

Yu³

2011

Heat Transfer - Mathematical Modelling, Numerical Methods and Information Technology

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“…Additional heat transfer due to conduction between particles during gas-solid transport in horizontal pipes was taken into account by Li and Mason [29][30][31]. Both convective and conductive heat transfer in a gas-fluidised bed for coal combustion were considered by Zhou et al [32,33]. Similarly, Malone and Xu [34] estimated heat transfer for liquid-fluidised beds with CCDM and concluded that further investigations concerning heat transfer have to be carried out.…”

Section: Introductionmentioning

confidence: 99%

The Extented Discrete Element Method (XDEM): An Advanced Approach to Model Blast Furnace

Peters¹,

Baniasadi²,

Baniasadi³

2018

Iron Ores and Iron Oxide Materials

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The blast furnace iron making is the oldest but still the main method to produce liquid iron through sequential reduction processes of iron ore materials. Despite the existence of several discrete and continuous numerical models, there is no global method to provide detailed information about the processes inside the furnaces. The extended discrete element method known as XDEM is an advance numerical tool based on Eulerian-Lagrangian framework which is able to cover more information about the blast furnace process. Within this platform, the continuous phases such as gas and liquid phases are coupled to the discrete entities such as coke and iron ore particles through mass, momentum and energy exchange. This method has been applied to the shaft, cohesive zone, dripping zone and hearth of the blast furnace. In this chapter, the mathematical and numerical methods implemented in the XDEM method are described, and the results are discussed.

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DEM-LES simulation of coal combustion in a bubbling fluidized bed Part II: coal combustion at the particle level

Cited by 98 publications

References 0 publications

Effect of High Reactivity Coke for Mixed Charge in Ore Layer on Reaction Behavior of Each Particle in Blast Furnace

Effect of High Reactivity Coke for Mixed Charge in Ore Layer on Reaction Behavior of Each Particle in Blast Furnace

Particle Scale Simulation of Heat Transfer in Fluid Bed Reactors

The Extented Discrete Element Method (XDEM): An Advanced Approach to Model Blast Furnace

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