Factors affecting the reactivity of coal chars during gasification, and indices representing reactivity

Miura, Kouichi; Hashimoto, Kenji; Silveston, P. L.

doi:10.1016/0016-2361(89)90046-x

Cited by 305 publications

(203 citation statements)

References 79 publications

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“…Alternatively, this fly ash carbon also had a significant opportunity to thermally "anneal" due to the high temperatures that it probably experienced in the boiler. [25][26][27][28]. The observation of similar reactivity is therefore interesting insofar as it suggests that these factors are not fundamentally altered or overridden by the processes that take place during the achievement of high burnout-the sample from the fly ash is similar to an ordinary lab char.…”

Section: Kinetics Of Gasification In Oxygenmentioning

confidence: 91%

Study of Activation of Coal Char

Suuberg¹,

Kulaots²,

Aarna³

et al. 2003

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Section: Kinetics Of Gasification In Oxygenmentioning

confidence: 91%

Study of Activation of Coal Char

Suuberg¹,

Kulaots²,

Aarna³

et al. 2003

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“…Several researchers (Agarwal and Sears 1980;Radovic et al 1983;Takarada et al 1986;Miura et al 1989;Ochoa et al 2001;Song and Kim 1993;Li 2007;Hattingh et al 2011) investigated the effect of catalyst on reactivity of char obtained from coals ranging peat to anthracite during gasification in the presence of varying gasifying mediums. Presence of catalyst in char can be inherent or may be impregnated.…”

Section: Effect Of Operating Parameters 21 Effect Of Catalytic Activmentioning

confidence: 99%

Effect of operating parameters on coal gasification

Mishra

Gautam

Sharma

2018

Int J Coal Sci Technol

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Coal combustion and gasification are the processes to utilize coal for production of electricity and many other applications. Global energy demand is increasing day by day. Coal is an abundant source of energy but not a reliable source as it results into high CO 2 emissions. Energy industries are expected to decrease the CO 2 emission to prevent global warming. Coal gasification is a process that reduces the CO 2 emission and emerges as a clean coal technology. Coal gasification process is regulated by several operating parameters. A Number of investigations have been carried out in this direction. A critical review of the work done by several researchers in the field of coal gasification has been compiled in this paper. The effect of several operating parameters such as coal rank, temperature, pressure, porosity, reaction time and catalyst on gasification has been presented here.

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“…Effect of Preparation (Pyrolysis) Conditions on Coal Char Reactivity. Several authors (Kristiansen, 1995;Hindmarsh et al, 1995;McDonald et al, 1992;Miura et al, 1989;Patel et al, 1988;Zygourakis, 1988;Radovic et al, 1983;Jenkins et al, 1973) show that the combustion kinetics of coal char are influenced markedly by the heating rate of the initial coal sample, the residence time at the final pyrolysis conditions, the applied final pyrolysis temperature, and the presence of inorganics in the coal (and char) sample. Hindmarsh et al (1995) performed the pyrolysis of coal in a wire-mesh reactor (also indicated as a screen heater reactor) and in an entrained-flow reactor (drop tube).…”

Section: Literaturementioning

confidence: 99%

“…This H/C ratio increases with increasing heating rate but decreases when the final pyrolysis temperature is elevated. Miura et al (1989) deduced from their experiments that the reactivity of low-rank coals (with less than 80 wt % C) is mainly determined by the presence of catalytically active metals like Ca, Fe, Na, and K, while for high-rank coals, it is controlled by the intrinsic reactivity.…”

Section: Literaturementioning

confidence: 99%

Combustion Kinetics of Char Obtained by Flash Pyrolysis of Pine Wood

Janse

Jonge

Prins

et al. 1998

Ind. Eng. Chem. Res.

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The combustion kinetics of rapidly pyrolyzed wood have been investigated within the temperature range of 573-773 K and the oxygen concentration range of 2.25-36 vol %. These kinetics are, for instance, required for the design of a char combustion section in an integrated flash pyrolysis pilot plant. Two different experimental techniques were used: a standard thermogravimetrical technique (TGA) and flue gas analysis after combustion in a diluted packed bed. The pyrolysis char was prepared in a small screen heater reactor, enabling heating rates of over 300 K/s. The results of the TGA and the packed-bed measurements are in good agreement for temperatures above 648 K. Below that temperature, the reaction rate observed in the TGA appears to be (up to 1.5 times) lower than that in the packed-bed reactor. The combustion kinetics can be described by the following simple rate equation which has an average deviation of 20%: r ) 5.3 × 10 5 e -125×10 3 /RT P O 2 0.53 (1 -X) 0.49 . Several pore models reported in the literature were tested against the experimental data, but they could not improve the accuracy of the fit. In comparison with available data, this specific type of char shows a notably higher rate of combustion.

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Factors affecting the reactivity of coal chars during gasification, and indices representing reactivity

Cited by 305 publications

References 79 publications

Study of Activation of Coal Char

Study of Activation of Coal Char

Effect of operating parameters on coal gasification

Combustion Kinetics of Char Obtained by Flash Pyrolysis of Pine Wood

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