Effect of steam injection on pore structure and distribution in coke samples produced by delayed coking☆

Karacan, C. Özgen; Badger, Mark W.

doi:10.1016/s0016-2361(02)00395-2

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…It seems illogical since in this work the porosity has been considered as the space left by the coke volume fraction; therefore, a higher quantity of coke should generate a lower porosity, which did not happen. However, these results confirm observations made by Karacan & Badger (2003) who affirm that the properties of the coke bed depend on the fluid-dynamic variables of the reaction medium, phenomenon that is reproduced in this work by computational simulation. Figure 19 shows the medium Reynolds number inside the coke bed for the phases vacuum residue, and distillables plotted against the volume-averaged porosity of each coke bed.…”

Section: Results Analysissupporting

confidence: 93%

“…An apparent linear relationship is observed, where the increase in the Reynolds number generates an increase in the coke bed porosity. Karacan & Badger (2003) presented similar results experimentally. In their work, the porosity of a coke bed from a delayed coking pilot plant reactor is measured with and without steam injection; the porosity is, evidently, higher with steam injection (increased Reynolds number).…”

Section: Results Analysissupporting

confidence: 73%

“…When the porosity of the coke bed is compared with the Reynolds number of the liquid and gas phase, an apparent linear relationship is found, where the increase in the Reynolds number generates an increase in the coke bed porosity. Karacan & Badger (2003) submitted similar results through an experimental work in a delayed coking pilot plant. These results correctly indicate that the simulation model presented in this work simulates the effect of the fluid-dynamic variables of the reaction medium on the formation, accumulation and properties of the coke bed.…”

Section: Discussionmentioning

confidence: 57%

See 2 more Smart Citations

CFD simulation of a pilot plant delayed coking reactor using an in-house CFD code

Díaz¹,

Chaves–Guerrero²,

Gauthier‐Maradei³

et al. 2017

CT&F Cienc. Tecnol. Futuro

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A simulation of a pilot plant delayed coking reactor was performed using an in-house computational fluid dynamics (CFD) code. The reactor was modeled as a three-phase dynamic system where the coke is the porous solid phase, the vacuum residue the liquid phase and the distillable product the gas phase. Equations of continuity, momentum, and energy proposed to describe the coking dynamic process where discretized employing the finite volume method and the domain was defined by a 2D structured axisymmetric grid. A PEA algorithm was developed to account for the drag between the fluid phases, and a modified SIMPLEC algorithm achieved the pressure-velocity coupling. The CFD simulator was programmed in C++ code for Linux operating system; all the graphics were constructed in ParaView visualization platform. A full run of 12 hours and the cooling of the resulting coke bed for three different vacuum residues were simulated, the results were compared with experimental data and a good agreement was observed, the simulator demonstrated great potential to be scaled up to industrial level.

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Section: Results Analysissupporting

confidence: 93%

Section: Results Analysissupporting

confidence: 73%

Section: Discussionmentioning

confidence: 57%

See 1 more Smart Citation

CFD simulation of a pilot plant delayed coking reactor using an in-house CFD code

Díaz¹,

Chaves–Guerrero²,

Gauthier‐Maradei³

et al. 2017

CT&F Cienc. Tecnol. Futuro

View full text Add to dashboard Cite

show abstract

“…To address these weaknesses in the bubble observation techniques, researchers need to investigate the noncontact ''tomography'' observation methods, including Optical Coherence Tomography (OCT), and X-ray and the gamma-ray computed tomographies, which traditionally have been used as nondestructive evaluation techniques [72,73]. X-raycomputed tomography is a particularly appealing candidate for a real-time measurement of bubbles (or moving ''porosities'') because it has been used successfully to measure porosities in other manufacturing processes [74][75][76].…”

Section: A Need For Accurate Experimental Observation Of Partial Saturation and Bubble Motionmentioning

confidence: 99%

Modeling the Unsaturated Flow in Liquid Composite Molding Processes: A Review and Some Thoughts

Pillai

2004

Journal of Composite Materials

118

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The liquid composite molding (LCM) processes for manufacturing polymer composites involve injecting a thermoset resin into a fiber-packed mold cavity. Very often, the fiber preform behind the resin front is partially saturated during the mold-filling process in LCM, giving rise to an unsaturated flow in that region. This paper first discusses the role of dual-scale porous media in inducing unsaturated flow in certain directional (woven, stitched, or braided) mats due to the delayed impregnation of tows. The approach of using a sink term in the mass balance equation is compared with the traditional approach of using unsaturated permeability for modeling unsaturated flow in dual-scale directional mats. Later, the relation of unsaturated flow with the phenomenon of bubble formation and migration is discussed. The lack of connection between the unsaturated flow research on the one hand, and the bubble creation and migration research on the other, is highlighted next. A few suggestions are offered on related topics, including the modeling of bubble motion, and the need for accurate experiments in unsaturated flow.

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“…as aforesaid. It has been shown that total porosity and pore structure are significant factors affecting coke strength (Donskoi et al 2013;Grant and Chaklader 1991;Johnson et al 2013;Karacan and Badger 2003;Xing et al 2013). It was observed that coke strength is mainly determined by pores and cracks that cause fracturing of coke (Kubota et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Influence of coke structure on coke quality using image analysis method

Ghosh

Sahoo

Chakraborty

et al. 2018

Int J Coal Sci Technol

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The quality of coke affects the performance of the blast furnace, factors affecting coke quality include coal properties, coal charge granulometry and carbonization conditions. The coke properties include the size analysis, cold strength (Micum Indices-M 40 , M 10) and hot strength (Coke Reactivity Index-CRI, Coke Strength after Reaction-CSR) properties and structural properties such as coke structure and texture. Structural properties comprise the porosity, pore-cell wall thickness and pore sizes, while textures consist of the carbon forms in the coke. In present work, advanced method such as image analysis method was used to interpret coke microstructure. Conventional methods such as determination of coke porosity by measurement of real and apparent density and mercury porosimetry have a number of limitations. Coke size, magnification, number of image frames captured, process of pellet preparations and coke properties such as M 40 , M 10 , CRI and CSR (low, medium and high values) were taken as variables for experimental purposes. The coke structure parameters such as porosity, length, perimeter, breadth, roundness, pore-wall thickness and pore size distribution of the pores were determined by image analysis method. This method provided average porosity in addition to pore-wall thickness and pore-size distribution. The pore wall thickness measurement by image analysis method provided significant correlations with M 40 , CRI and CSR values. This explained the usability of image analysis for coke structure measurement.

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Effect of steam injection on pore structure and distribution in coke samples produced by delayed coking☆

Cited by 10 publications

References 6 publications

CFD simulation of a pilot plant delayed coking reactor using an in-house CFD code

CFD simulation of a pilot plant delayed coking reactor using an in-house CFD code

Modeling the Unsaturated Flow in Liquid Composite Molding Processes: A Review and Some Thoughts

Influence of coke structure on coke quality using image analysis method

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