Modelling of combustion characteristics of high ash coal char particles at high pressure: Shrinking reactive core model

Sadhukhan, Anup Kumar; Gupta, Parthapratim; Saha, Ranajit

doi:10.1016/j.fuel.2009.07.029

Cited by 52 publications

(38 citation statements)

References 30 publications

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“…The results presented in Table 1 and Figures 1–3 are consistent with the shrinking core model (Chang and Kuo, 1999; Sadhukhan et al, 2010) for the production of activated carbon from petcoke. That is, the outer part of the particle was activated first and converted into an amorphous/porous structure, which allowed access for the reactants to the inner core.…”

Section: Resultssupporting

confidence: 85%

Ni catalysts supported on activated carbon from petcoke and their activity for toluene hydrogenation

et al. 2011

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Petroleum coke (petcoke) is an abundant resource that can potentially be converted to catalyst support materials through activation to increase the surface area and reduce the sulphur content. In this work, potassium hydroxide (KOH) catalysed activation was employed with petcoke to produce activated carbons, which were characterised with nitrogen physisorption, X‐ray diffraction, scanning electron microscopy and temperature‐programmed reduction. With activation temperatures between 500 and 800°C, the surface area increased from 4 m2/g to between 200 and 2400 m2/g while the sulphur content was reduced from 6.6 wt% to between 1 and 0.2 wt%. Nickel catalysts (nominally 5 wt%) were prepared on the activated carbon supports using wet impregnation. The activities of these catalysts were measured for toluene hydrogenation in a plug‐flow reactor with a toluene liquid hourly space velocity of 2.4/h, a pressure of 1.38 MPa, and a H2/toluene mole ratio of 90. The catalytic activity varied between zero for nickel supported on petcoke to 98% conversion, with essentially 100% to methylcyclohexane for nickel supported on carbon activated at 750°C. Thus, activated carbon from petcoke was a suitable support for Ni‐based catalysts when used for toluene hydrogenation as a model reaction. © 2011 Canadian Society for Chemical Engineering

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Section: Resultssupporting

confidence: 85%

Ni catalysts supported on activated carbon from petcoke and their activity for toluene hydrogenation

et al. 2011

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“…Although in many cases the shrinking core model was proven to approximate the results of the continuous models quite or reasonably well (Ishida and Wen, 1971;Do, 1982), non-negligible errors can result when it is not used properly (Melchiori and Canu, 2014). Several authors (Sadhukhan et al, 2010;Niksiar and Rahimi, 2009;Patisson and Ablitzer, 2002) agree that the accuracy of more detailed continuous models is needed to achieve a proper description of gas-solid reacting systems. Besides, the shrinking core model cannot properly account for several reacting shells that are expected with multistep reactions, although it has been applied to these cases also (Tsay et al, 1976).A shrinking-core model approach was followed by Abad et al (2011), to study the kinetics of the ilmenite-pseudobrookite system, for both oxidation and reduction steps.…”

Section: Introductionmentioning

confidence: 99%

Reacting porous solids with phase segregation

Melchiori

Gallucci

Annaland

et al. 2015

Chemical Engineering Science

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“…Therefore, the kinetic models commonly used in practice, such as the homogeneous model, the shrinking core model, the random pore model, the modified random pore model, and the modified volumetric model, are phenomenological models; of these, the homogeneous and unreacted shrinking core models are used most frequently. In the present paper, the homogeneous and unreacted shrinking core models were adopted to investigate the combustion reactivity of lignite microscopic structures [26].…”

Section: Kineticsmentioning

confidence: 99%

Macerals of Shengli Lignite in Inner Mongolia of China and Their Combustion Reactivity

Teng

Liu

et al. 2016

Journal of Chemistry

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The macerals, including fusinitic coal containing 72.20% inertinite and xyloid coal containing 91.43% huminite, were separated from Shengli lignite using an optical microscope, and their combustion reactivity was examined by thermogravimetric analysis. Several combustion parameters, including ignition and burnout indices, were analyzed, and the combustion kinetics of the samples were calculated by regression. Fusinitic coal presented a porous structure, while xyloid coal presented a compact structure. The specific surface area of fusinitic coal was 2.5 times larger than that of xyloid coal, and the light-off temperature of the former was higher than that of the latter. However, the overall combustion reactivity of fusinitic coal was better than that of xyloid coal. The combustion processes of fusinitic and xyloid coals can be accurately described by both the homogeneous model and the shrinking core model. The features of xyloid coal agree with the shrinking core model when its conversion rate is 10%–90%. The activation energy of fusinitic coal during combustion can be divided into three phases, with the middle phase featuring the highest energy. The activation energy of xyloid coal is lower than that of fusinitic coal in the light-off phase, which may explain the low light-off temperature of this coal.

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Modelling of combustion characteristics of high ash coal char particles at high pressure: Shrinking reactive core model

Cited by 52 publications

References 30 publications

Ni catalysts supported on activated carbon from petcoke and their activity for toluene hydrogenation

Ni catalysts supported on activated carbon from petcoke and their activity for toluene hydrogenation

Reacting porous solids with phase segregation

Macerals of Shengli Lignite in Inner Mongolia of China and Their Combustion Reactivity

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