A numerical study on parametric sensitivity of the flow characteristics on pulverized coal gasification

Cho, Han Chang

doi:10.1002/(sici)1099-114x(200005)24:6<511::aid-er600>3.0.co;2-m

Cited by 5 publications

(6 citation statements)

References 25 publications

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“…In the gas film zone, gas phase reactions dominate the process. Previous modeling work [6][7][8][9][10][11][12][13] has already shown that the carbon conversion ratio remains almost constant after the mixture enters the last stage (gas film zone) of the gasifier. Therefore, it is possible to study the gas film zone reactions using only a gas phase reaction mechanism, which is further supported by the fact that at this stage, the unburnt coal is almost completely covered with ash, isolating the particle from the surrounding gases.…”

Section: Basic Research Approachmentioning

confidence: 99%

“…reaction between oxygen and carbon may not be as important for slurry-feed entrained flow gasifier modeling as regarded by previous researchers [5][6][7][8][9][10][11][12][13] since the composition will be equilibrated to the same value very quickly. The second series simulated the gasification process with different carbon conversion ratios (Fig.…”

Section: Syngas Dynamic Performancementioning

confidence: 99%

“…The reaction rates among the involved species were assumed to be fast enough to reach an equilibrium state before exiting the gasifier. In kinetic models [5][6][7][8][9][10][11][12][13], gasifier performance was studied by calculating the reaction rate of the heterogeneous and homogenous reactions inside the gasifier. In the model of Li et al [5,6], in which five heterogeneous and six homogenous reactions were considered, a cell model concept was utilized to divide the Texaco gasifier into a series of cells to calculate the mass and energy balance for each cell.…”

Section: Introductionmentioning

confidence: 99%

“…In the model of Li et al [5,6], in which five heterogeneous and six homogenous reactions were considered, a cell model concept was utilized to divide the Texaco gasifier into a series of cells to calculate the mass and energy balance for each cell. More complicated CFD modeling work included momentum, mass, and energy conservation of the solid and gas phase species together with the turbulence calculations [7][8][9][10][11][12][13]. In these models, too much attention was paid to the flow structure and concentration distribution inside the gasifier.…”

Section: Introductionmentioning

confidence: 99%

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Syngas composition study

Wang

Jinning

Liu

et al. 2009

Front. Energy Power Eng. China

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The syngas composition characteristic was investigated in the real slurry-feed gasifier using a detailed gas phase reaction mechanism. The results show that the time for syngas to reach equilibrium is much shorter than the residence time for slurry feed entrained-flow gasifiers, indicating a gas phase species partial equilibrium state. Further calculation shows that the four major species, CO, CO 2 , H 2 , and H 2 O, are in equilibrium via the reaction CO þ H 2 O () CO 2 þH 2 . Suggestions are provided for future modeling and model validation.

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Section: Basic Research Approachmentioning

confidence: 99%

Section: Syngas Dynamic Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Syngas composition study

Wang

Jinning

Liu

et al. 2009

Front. Energy Power Eng. China

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“…The pyrolysis process will be completed instantaneously. The composition of volatiles released from coal is therefore prescribed and obtained by an equilibrium calculation based on the analysis of the properties of the coal (Lee et al, 1998; Eaton et al, 1999; Cho, 2000; Petersen and Werther, 2005) …”

Section: Model Descriptionmentioning

confidence: 99%

Simulation of coal gasification in a pressurized spout‐fluid bed gasifier

Zhang

Zhong

et al. 2009

Can J Chem Eng

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Based on an Eulerian-Eulerian method, a three-dimensional kinetic model involving mass transfer, momentum transfer, heat transfer, and chemical reaction is developed to simulate the process of coal gasification in a 2 MW th pressurized spout-fluid bed of 450 mm in diameter with bed pressure up to 0.5 MPa. The effects of operating pressure and bed temperature on coal gasification are investigated. The high operating pressure is beneficial to coal gasification due to the fact that the fluidization in the reactor becomes better. On one hand, a higher bed temperature can accelerate the rate of reaction. On the other hand, more air will be taken in the gasifier to keep the higher bed temperature which will consume part of combustible gases produced by coal pyrolysis or gasification. Experimental verification was carried out in a 2 MW th thermal input pressurized spout-fluid bed under the same operating condition. The comparison of calculation results with experimental results shows that most of the calculation errors are within the range of 15%.En se basant sur une méthode eulérienne-eulérienne, un modèle cinétiqueà 3 dimensions englobant le transfert de masse, le transfert de vitesse, le transfert de chaleur et la réaction chimique estélaboré afin de simuler le processus de gazéification du charbon dans un lit fluidisé jaillissant de 2 MWTH d'un diamètre de 450 mm dont la pression du lit peut atteindre 0,5 MPa. Les effets de la pression de fonctionnement et de la température du lit sur la gazéification du charbon sontétudiés. La pression de fonctionnementélevée est bénéfiqueà la gazéification du charbon car la fluidisation s'améliore dans le réacteur. D'un côté, une température de lit plusélevée peut accélérer le taux de réaction. De l'autre, une plus grande quantité d'air sera admise dans le gazogène afin de conserver la température de lit plusélevée, ce qui consommera une partie des gaz combustibles produits par la pyrolyse ou gazéification du charbon. Une vérification expérimentale aété effectuée dans un lit fluidisé jaillissant sous pressionà influx thermique de 2 MWTH dans les mêmes conditions de fonctionnement. La comparaison des résultats des calculs avec les résultats expérimentaux a démontré que la plupart des erreurs de calcul se situaientà l'intérieur d'une limite de 15 %.

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Hydrogen Production from a Fluidized‐bed Coal Gasifier with In Situ Fixation of CO₂–Part I: Numerical Model

Lü

Zhang

et al. 2008

Chem Eng & Technol

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In order to attempt to eliminate global warming effects, it is highly desirable that new technologies with lower or zero emission of CO 2 to the environment are developed. In this work, a high-pressure fluidized-bed coal gasifier for H 2 production with in situ fixation of CO 2 is simulated by a comprehensive two-dimensional model. The Eddy Dissipation Concept (EDC) model is first adopted in the pulverized coal gasification model to simultaneously describe the turbulent mixing and detailed chemical kinetics. The developed model is verified with experimental results. The simulated concentrations for the gas product agree well with the experimental data. The simulated distributions for gas temperature and velocity correlate well with the reaction mechanism and experimental phenomena.

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A numerical study on parametric sensitivity of the flow characteristics on pulverized coal gasification

Cited by 5 publications

References 25 publications

Syngas composition study

Syngas composition study

Simulation of coal gasification in a pressurized spout‐fluid bed gasifier

Hydrogen Production from a Fluidized‐bed Coal Gasifier with In Situ Fixation of CO₂–Part I: Numerical Model

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A numerical study on parametric sensitivity of the flow characteristics on pulverized coal gasification

Cited by 5 publications

References 25 publications

Syngas composition study

Syngas composition study

Simulation of coal gasification in a pressurized spout‐fluid bed gasifier

Hydrogen Production from a Fluidized‐bed Coal Gasifier with In Situ Fixation of CO2–Part I: Numerical Model

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Product

Resources

About

Hydrogen Production from a Fluidized‐bed Coal Gasifier with In Situ Fixation of CO₂–Part I: Numerical Model