Mathematical modeling of coal char reactivity with CO2 at high pressures and temperatures

Liu, Guisu; Tate, A.G.; Bryant, Glenn; Wall, Terry

doi:10.1016/s0016-2361(99)00274-4

Cited by 86 publications

(67 citation statements)

References 25 publications

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“…The values of obtained constants are presented in Table 2. Obtained activation energies and frequency factors via equation 1 for solid fuel samples is in good agreement with presented into literature data for high and low-quality coals [6,7]. The analysis of defined constants shows that carbon content into solid fuel and coal char increasing causes activation energy and frequency factor decreasing.…”

Section: A) B)supporting

confidence: 82%

Kinetic study of coals gasification into carbon dioxide atmosphere

Коротких

Slyusarskiy

2015

MATEC Web of Conferences

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Abstract. The solid fuel gasification process was investigated to define chemical reactions rate and activation energy for a gas-generator designing and regime optimizing. An experimental procedure includes coal char samples of Kuznetskiy and Kansko-Achinskiy deposits consequent argon pyrolysis into argon and oxidating into carbon dioxide with different temperatures. The thermogravimetric analysis data of coal char gasification into carbon dioxide was obtained in the temperature range 900-1200 ºC. The mass loss and gasification time dependencies from temperature were defined to calculate chemical reaction frequency factor and activation energy. Two coal char gasification physico-mathematical models were proposed and recommendations for them were formed.

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Section: A) B)supporting

confidence: 82%

Kinetic study of coals gasification into carbon dioxide atmosphere

Коротких

Slyusarskiy

2015

MATEC Web of Conferences

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“…The actual E values determined by the algorithm for both the pure coal char and the coal and biomass char blend were found comparable to values reported by Zhu, Sing, and Lin (2008) and Liu et al (2000) for the gasification of coal chars. Table IV also displays the determined values of 12.2 and 11.7 for the two chars, which compare to the range of values of 2.2 to 50 reported in the literature (Liu and Niksa, 2004;Zolin, 2001;Charpenay, Serio, and Solomon, 1992.…”

supporting

confidence: 85%

An algorithm for determining kinetic parameters for the dissociation of complex solid fuels

Mavhengere

Vittee

Wagner

et al. 2016

J. S. Afr. Inst. Min. Metall.

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“…Other, more complex, mechanisms which consider additional steps as well as inhibition through different routes such as direct adsorption of the products onto active sites have also been proposed [11][12][13][14].…”

Section: Mechanismmentioning

confidence: 99%

Impact of finite-rate kinetics on carbon conversion in a high-pressure, single-stage entrained flow gasifier with coal–CO2 slurry feed

et al. 2013

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Coal-CO 2 slurry feed has been suggested as an attractive alternative to coal-water slurry feed for single-stage, entrained-flow gasifiers. Previous work demonstrated the system-level advantages of gasification-based plants equipped with CO 2 capture and CO 2 slurry feed, under the assumption that carbon conversion remains unchanged. However, gasification in carbon dioxide has been observed to be slower than that in steam. In view of this, the impact of CO 2 slurry feeding on gasification kinetics and ultimately on carbon conversion and oxygen consumption in a pressurized, single-stage entrained-flow gasifier processing Illinois 6 coal is studied here using a 1-D reduced order model. Results show that the CO 2 gasification reaction plays a dominant role in char conversion when the feeding system is CO 2 slurry, increasing the CO content in the products by up to a factor of two. CO inhibition of the gasification reaction and a higher degree of internal mass transport limitations lead to an up to 60% slower gasification rate, when compared to a system based on coal-water slurry. Accordingly, a gasifier with CO 2 slurry feed has a 7%-point lower carbon conversion for a given outlet temperature. The gasifier exit temperature must be raised by 90K in order to achieve the same conversion as in a water slurry-fed reactor; the peak reactor temperature increases by 220K as a result. Net oxygen savings of 8% are estimated for a system with a CO 2 slurry-fed gasifier relative to one with water slurry and the same level of conversion.

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Mathematical modeling of coal char reactivity with CO2 at high pressures and temperatures

Cited by 86 publications

References 25 publications

Kinetic study of coals gasification into carbon dioxide atmosphere

Kinetic study of coals gasification into carbon dioxide atmosphere

An algorithm for determining kinetic parameters for the dissociation of complex solid fuels

Impact of finite-rate kinetics on carbon conversion in a high-pressure, single-stage entrained flow gasifier with coal–CO2 slurry feed

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