Simultaneous pyrolysis and char combustion

Jaakko Saastamoinen, Martti Aho, Veli Linna

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Simultaneous pyrolysis and char combustion of < 500 μm coal and peat particles in an entrained-flow reactor was studied experimentally and theoretically at 700–1100 °C and at oxygen contents < 21 vol%. A method based on near infrared radiation was developed to measure the particle temperatures. Simultaneous pyrolysis and char oxidation occurs when oxygen reaches the char particle surface during the devolatilization stage. The overlap of homogeneous and heterogeneous combustion is favoured by low temperature and high oxygen content, as well as by a decrease in particle size. A simplified method of calculating simultaneous pyrolysis and char oxidation is presented. Model calculations show that under some conditions a maximum combustion rate may be achieved with a specific particle size, since the contribution of faster homogeneous combustion is increased relative to slower heterogeneous combustion.

Original languageEnglish
Pages (from-to)599-609
Number of pages11
JournalFuel
Volume72
Issue number5
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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Pyrolysis
Oxygen
Particle size
Oxidation
Peat
Coal
Infrared radiation
Temperature

Cite this

Saastamoinen, J., Aho, M., & Linna, V. (1993). Simultaneous pyrolysis and char combustion. Fuel, 72(5), 599-609. https://doi.org/10.1016/0016-2361(93)90571-I
Saastamoinen, Jaakko ; Aho, Martti ; Linna, Veli. / Simultaneous pyrolysis and char combustion. In: Fuel. 1993 ; Vol. 72, No. 5. pp. 599-609.
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abstract = "Simultaneous pyrolysis and char combustion of < 500 μm coal and peat particles in an entrained-flow reactor was studied experimentally and theoretically at 700–1100 °C and at oxygen contents < 21 vol{\%}. A method based on near infrared radiation was developed to measure the particle temperatures. Simultaneous pyrolysis and char oxidation occurs when oxygen reaches the char particle surface during the devolatilization stage. The overlap of homogeneous and heterogeneous combustion is favoured by low temperature and high oxygen content, as well as by a decrease in particle size. A simplified method of calculating simultaneous pyrolysis and char oxidation is presented. Model calculations show that under some conditions a maximum combustion rate may be achieved with a specific particle size, since the contribution of faster homogeneous combustion is increased relative to slower heterogeneous combustion.",
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Saastamoinen, J, Aho, M & Linna, V 1993, 'Simultaneous pyrolysis and char combustion', Fuel, vol. 72, no. 5, pp. 599-609. https://doi.org/10.1016/0016-2361(93)90571-I

Simultaneous pyrolysis and char combustion. / Saastamoinen, Jaakko; Aho, Martti; Linna, Veli.

In: Fuel, Vol. 72, No. 5, 1993, p. 599-609.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Saastamoinen, Jaakko

AU - Aho, Martti

AU - Linna, Veli

N1 - Project code: PLT1017

PY - 1993

Y1 - 1993

N2 - Simultaneous pyrolysis and char combustion of < 500 μm coal and peat particles in an entrained-flow reactor was studied experimentally and theoretically at 700–1100 °C and at oxygen contents < 21 vol%. A method based on near infrared radiation was developed to measure the particle temperatures. Simultaneous pyrolysis and char oxidation occurs when oxygen reaches the char particle surface during the devolatilization stage. The overlap of homogeneous and heterogeneous combustion is favoured by low temperature and high oxygen content, as well as by a decrease in particle size. A simplified method of calculating simultaneous pyrolysis and char oxidation is presented. Model calculations show that under some conditions a maximum combustion rate may be achieved with a specific particle size, since the contribution of faster homogeneous combustion is increased relative to slower heterogeneous combustion.

AB - Simultaneous pyrolysis and char combustion of < 500 μm coal and peat particles in an entrained-flow reactor was studied experimentally and theoretically at 700–1100 °C and at oxygen contents < 21 vol%. A method based on near infrared radiation was developed to measure the particle temperatures. Simultaneous pyrolysis and char oxidation occurs when oxygen reaches the char particle surface during the devolatilization stage. The overlap of homogeneous and heterogeneous combustion is favoured by low temperature and high oxygen content, as well as by a decrease in particle size. A simplified method of calculating simultaneous pyrolysis and char oxidation is presented. Model calculations show that under some conditions a maximum combustion rate may be achieved with a specific particle size, since the contribution of faster homogeneous combustion is increased relative to slower heterogeneous combustion.

U2 - 10.1016/0016-2361(93)90571-I

DO - 10.1016/0016-2361(93)90571-I

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