Determination of heats of pyrolysis and thermal reactivity of peats

Martti Aho, Jouni Tummavuori, Jouni Hämäläinen, Jaakko Saastamoinen

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Heats of pyrolysis of four Finnish peats were determined by differential scanning calorimetry (d.s.c.), and combustion enthalpies were compared by differential thermoanalysis (DTA) in an air atmosphere. Weight loss data obtained by thermogravimetric analysis (TGA) were combined with the enthalpy data. The heats of pyrolysis of the peats varied between 120 and 250 kJ kg−1. These values were used to model the combustion and pyrolysis of small peat particles (typical in pulverized fuel combustion) and large peat particles (typical in grate combustion). TGA and DTA together gave useful information about the reactivity of peat in an oxidizing atmosphere with changing temperature, despite the similar shapes of the derived TGA (DTG) and DTA-curves. The pyrolysis and combustion behaviour of the peat with the lowest degree of decomposition was similar to that of cellulose, and the differences in the peats were apparent with all the methods used (d.s.c., DTA and TGA). The initial temperatures of pyrolysis and combustion were lower with peats of high ash content (inorganic material) and the combustion proceeded through more steps than with the peats of low ash content.
Original languageEnglish
Pages (from-to)1107-1111
JournalFuel
Volume68
Issue number9
DOIs
Publication statusPublished - 1989
MoE publication typeA1 Journal article-refereed

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Pyrolysis
Peat
Ashes
Thermoanalysis
Thermogravimetric analysis
Differential scanning calorimetry
Enthalpy
Pulverized fuel
Hot Temperature
Cellulose
Decomposition
Temperature
Air

Cite this

Aho, Martti ; Tummavuori, Jouni ; Hämäläinen, Jouni ; Saastamoinen, Jaakko. / Determination of heats of pyrolysis and thermal reactivity of peats. In: Fuel. 1989 ; Vol. 68, No. 9. pp. 1107-1111.
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abstract = "Heats of pyrolysis of four Finnish peats were determined by differential scanning calorimetry (d.s.c.), and combustion enthalpies were compared by differential thermoanalysis (DTA) in an air atmosphere. Weight loss data obtained by thermogravimetric analysis (TGA) were combined with the enthalpy data. The heats of pyrolysis of the peats varied between 120 and 250 kJ kg−1. These values were used to model the combustion and pyrolysis of small peat particles (typical in pulverized fuel combustion) and large peat particles (typical in grate combustion). TGA and DTA together gave useful information about the reactivity of peat in an oxidizing atmosphere with changing temperature, despite the similar shapes of the derived TGA (DTG) and DTA-curves. The pyrolysis and combustion behaviour of the peat with the lowest degree of decomposition was similar to that of cellulose, and the differences in the peats were apparent with all the methods used (d.s.c., DTA and TGA). The initial temperatures of pyrolysis and combustion were lower with peats of high ash content (inorganic material) and the combustion proceeded through more steps than with the peats of low ash content.",
author = "Martti Aho and Jouni Tummavuori and Jouni H{\"a}m{\"a}l{\"a}inen and Jaakko Saastamoinen",
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Determination of heats of pyrolysis and thermal reactivity of peats. / Aho, Martti; Tummavuori, Jouni; Hämäläinen, Jouni; Saastamoinen, Jaakko.

In: Fuel, Vol. 68, No. 9, 1989, p. 1107-1111.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Determination of heats of pyrolysis and thermal reactivity of peats

AU - Aho, Martti

AU - Tummavuori, Jouni

AU - Hämäläinen, Jouni

AU - Saastamoinen, Jaakko

PY - 1989

Y1 - 1989

N2 - Heats of pyrolysis of four Finnish peats were determined by differential scanning calorimetry (d.s.c.), and combustion enthalpies were compared by differential thermoanalysis (DTA) in an air atmosphere. Weight loss data obtained by thermogravimetric analysis (TGA) were combined with the enthalpy data. The heats of pyrolysis of the peats varied between 120 and 250 kJ kg−1. These values were used to model the combustion and pyrolysis of small peat particles (typical in pulverized fuel combustion) and large peat particles (typical in grate combustion). TGA and DTA together gave useful information about the reactivity of peat in an oxidizing atmosphere with changing temperature, despite the similar shapes of the derived TGA (DTG) and DTA-curves. The pyrolysis and combustion behaviour of the peat with the lowest degree of decomposition was similar to that of cellulose, and the differences in the peats were apparent with all the methods used (d.s.c., DTA and TGA). The initial temperatures of pyrolysis and combustion were lower with peats of high ash content (inorganic material) and the combustion proceeded through more steps than with the peats of low ash content.

AB - Heats of pyrolysis of four Finnish peats were determined by differential scanning calorimetry (d.s.c.), and combustion enthalpies were compared by differential thermoanalysis (DTA) in an air atmosphere. Weight loss data obtained by thermogravimetric analysis (TGA) were combined with the enthalpy data. The heats of pyrolysis of the peats varied between 120 and 250 kJ kg−1. These values were used to model the combustion and pyrolysis of small peat particles (typical in pulverized fuel combustion) and large peat particles (typical in grate combustion). TGA and DTA together gave useful information about the reactivity of peat in an oxidizing atmosphere with changing temperature, despite the similar shapes of the derived TGA (DTG) and DTA-curves. The pyrolysis and combustion behaviour of the peat with the lowest degree of decomposition was similar to that of cellulose, and the differences in the peats were apparent with all the methods used (d.s.c., DTA and TGA). The initial temperatures of pyrolysis and combustion were lower with peats of high ash content (inorganic material) and the combustion proceeded through more steps than with the peats of low ash content.

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