Kinetics of a lignite-char gasification by CO2

Adánez, Juan; Miranda, JoséL.; Gavilán, JoséMa

doi:10.1016/0016-2361(85)90013-4

Cited by 43 publications

(46 citation statements)

References 7 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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“…Again, the CO 2 -gasification rate increases rapidly at pressures below 0.6 MPa then the enhancement diminishes with further pressure increase. These features were observed under the inhibiting effects of CO as performed by Adánez et al [43]. …”

Section: Effect Of Pressurementioning

confidence: 62%

“…In these tests, the partial pressures of both CO 2 and CO increased at progressively higher test pressures even though the CO 2 mole fraction decreased. The gasification rate, however, generally decreased as the pressure increased, due to inhibition by CO [43].…”

Section: Effect Of Gas Compositionmentioning

confidence: 96%

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Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

Irfan

Usman

Kusakabe

2011

Energy

426

229

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“…These are summarized in Table 2 and resulted in the lowest root mean square (RMS) deviation when compared with 124 gasification rate measurements at high pressure taken from the literature, for 17 different chars [28,[36][37][38][39][40][41]. A similar comparison of the experiments with the rate law parameters by Liu [27] and by Liu and Niksa [25] resulted in an increasingly higher RMS deviation from the experimental data of .…”

Section: Intrinsic Heterogeneous Kineticsmentioning

confidence: 54%

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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Kinetics of a lignite-char gasification by CO2

Cited by 43 publications

References 7 publications

Kinetic study of coals gasification into carbon dioxide atmosphere

Kinetic study of coals gasification into carbon dioxide atmosphere

Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

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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