Impact of radiation models in CFD simulations of steam cracking furnaces

Habibi, Ali; Merci, Bart; Heynderickx, Geraldine

doi:10.1016/j.compchemeng.2006.11.009

Cited by 99 publications

(103 citation statements)

References 11 publications

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“…Varios modelos de radiación son susceptibles de ser usados en la simulación de los hornos, Habibi y Merci [11] compararon en una investigación el impacto ocasionado al utilizar el modelo P1 frente al modelo de ordenadas discretas (DO).…”

Section: Modelo De Radiaciónunclassified

“…Cinco medidores de temperatura son termopares y los medidores 3 y 7 son pirómetros. La temperatura adiabática para la combustión del metano tiene un valor de 2093°C, [11] para una temperatura de entrada en el aire de 25°C, para el caso del horno de recalentamiento se utiliza aire precalentado, esto provoca que la temperatura máxima de la combustión aumente, debido al ahorro de calor sensible que se pierde en calentar el aire cuando esta frío, Habini reporta en su trabajo una temperatura máxima aproximada de 2152°C, muy parecida a la temperatura propia del caso de estudio [11].…”

Section: Validaciónunclassified

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Simulación numérica de un horno tipo empujador para palanquillas con formación de óxido

Villa¹,

Solorio-Díaz²,

Hernández³

2015

ings

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El siguiente trabajo muestra un modelo numérico de un horno de recalentamiento tipo empujador, utilizando un programa comercial de dinámica de fluidos (CFD). El modelo acopla las ecuaciones de transferencia de calor, dinámica de fluidos y reacción química en estado no estacionario. Para la simulación de la combustión se utilizó el modelo de transportes de especies Eddy-dissipation; para la dinámica de fluidos de los gases se hizo uso del modelo k - e realizable. Se simuló la transferencia de calor considerando los mecanismos de conducción, convección y radiación. El modelo P-1 fue utilizado para simular la radiación que aportan los gases de combustión al calentamiento de la palanquilla. Las historias térmicas simuladas al interior de las palanquillas fueron comparadas con mediciones en planta. El modelo también acopla los modelos de oxidación superficial de la carga (barras de sección cuadrada de acero de 160 mm x 160 mm x 12.7 m). Se caracterizó el historial térmico en estado no estacionario de una palanquilla cuadrada de 16 mm y 12.7 m, durante su desplazamiento en el interior del horno, estas mediciones de temperatura permitieron caracterizar las pérdidas de material por formación de óxidos, en cada tiempo y posición al interior del horno de calentamiento.

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Section: Modelo De Radiaciónunclassified

Section: Validaciónunclassified

Simulación numérica de un horno tipo empujador para palanquillas con formación de óxido

Villa¹,

Solorio-Díaz²,

Hernández³

2015

ings

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“…In this work, we focus on three different radiation models: the P-1 model, the discrete transfer model (DTRM) model and the discrete ordinates model (DOM) model with the weighted-sum-of-gray-gas (WSGG) model (nongray model). [1,2] An axisymmetric simulation of the multiphase flow and temperature fields for radiation section of industrial scale connection is presented. Therefore, a coupled simulation of connection is needed.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow and heat transfer in connection of gasifier to the radiant syngas cooler

Liang

Yan

et al. 2009

Asia-Pacific J Chem Eng

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The connection of gasifier to the radiant syngas cooler has been regarded as a key technology for heat recovery system. Multiphase flow and heat transfer processes presented in this work considers particle deposition and radiation model to mixture of non-gray gas with particles. An axisymmetric simulation of the multiphase flow in an industrial scale connection is performed. The standard k -ε model, Renormalization group (RNG) k -ε model and Realizable k -ε model turbulence model are proposed. The particle motion is modeled by discrete random walk model. The discrete ordinates model (DOM), P-1 and discrete transfer model (DTRM) are used to model the radiative heat transfer. The effect of particles on the radiative heat transfer was taken into account when the DOM and P-1 model were used. The absorption coefficient of the gas mixture is calculated by means of a weighted-sum-of-gray-gas (WSGG) model. The results with the DOM and P-1 model are very similar and close to practical condition. A large number of particles are deposited on the cone of gasifier which is the top of connection. Maximum temperature difference is approximate 7 K when the cooling tube heights change from 0.5 m to 1.5 m. The temperature inside has a linear relationship with operating temperature. 

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“…The approximation adopted in this study for radiation modeling is the Discrete-Ordinates approach, which is an accurate method [7]. It can handle wide range of optical thickness, at the price of a high computational cost.…”

Section: Radiation Modelingmentioning

confidence: 99%

“…Due to the huge temperature difference between the flame and surroundings, the radiation modeling has a great importance. Habibi et al [7] interpreted CFD simulation about CH 4 /H 2 /air flames with different radiation heat exchange models and compared the results to adiabatic flame.…”

Section: Introductionmentioning

confidence: 99%

Fluid dynamics of a post-combustion chamber in electric arc steelmaking plants

Labiscsak¹,

Straffelini²,

Corbetta³

et al. 2011

Computational Methods and Experimental Measurements XV

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In the present work, a complete three dimensional fluid dynamics simulation of reacting fluid flow in post-combustion chamber of an electric arc furnace is presented. The chemical composition of the simulated off-gases was representing typical crucial load. The gap (where oxygen enters to combust hydrogen and carbon monoxide) size was an independent variable. The optimal gap size is desirable: if the gap size is too large, the thermal efficiency diminishes. On the other hand, if the chosen gap size is too small, oxygen deficiency occurs, which lead to incomplete combustion of carbon monoxide and hydrogen. Herein established, that by means of CFD calculation, the optimal gap size can be evaluated for a particular steelmaking furnace.

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Impact of radiation models in CFD simulations of steam cracking furnaces

Cited by 99 publications

References 11 publications

Simulación numérica de un horno tipo empujador para palanquillas con formación de óxido

Simulación numérica de un horno tipo empujador para palanquillas con formación de óxido

Numerical simulation of flow and heat transfer in connection of gasifier to the radiant syngas cooler

Fluid dynamics of a post-combustion chamber in electric arc steelmaking plants

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