Behavior of chars from Bursa Mustafa Kemal Pasa Alpagut and Balkesir Dursunbey Cakiirca Lignite (Turkey) during non-catalytic and catalytic gasification

The reactivities of chars obtained by pyrolysis of Bursa Mustafa Kemal Pasa Alpagut lignite and Balkesir Dursunbey Cakiirca lignite (Turkey) at different temperatures were determined by CO{sub 2} gasification and by combustion with O{sub 2}. Catalytic effect of Na{sub 2}CO{sub 3} on the CO{sub 2} an...

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Bibliographic Details
Published in:Energy sources. Part A, Recovery, utilization, and environmental effects Recovery, utilization, and environmental effects, 2008-07, Vol.30 (19)
Main Authors: Bozkurt, Y., Misirlioglu, Z., Sinag, A., Tekes, A.T., Canel, M.
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
ACTIVATION ENERGY
BROWN COAL
CARBON DIOXIDE
CATALYTIC EFFECTS
CHARS
CHEMICAL REACTION KINETICS
COAL GASIFICATION
COMBUSTION
GASIFICATION
LIGNITE
OXYGEN
PYROLYSIS
PYROLYSIS PRODUCTS
REACTIVITY
SODIUM CARBONATES
TEMPERATURE DEPENDENCE
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Summary:The reactivities of chars obtained by pyrolysis of Bursa Mustafa Kemal Pasa Alpagut lignite and Balkesir Dursunbey Cakiirca lignite (Turkey) at different temperatures were determined by CO{sub 2} gasification and by combustion with O{sub 2}. Catalytic effect of Na{sub 2}CO{sub 3} on the CO{sub 2} and O{sub 2} gasification reactivity of chars was investigated. Gasification tests were performed in the fixed bed reactors operating at ambient pressure. Reactivity of chars during the CO{sub 2} gasification reactions was determined by calculating the reaction rate constants and reactivity of chars during the O{sub 2} gasification was determined by using ignition temperatures of the samples. Activation energies and Arrhenius constants of the chars on the CO{sub 2} gasification reactions were also calculated by the help of Arrhenius curves. The activation energy for CO{sub 2} gasification was generally decreased with pyrolysis temperature, due to the different surface characteristics and different nature of carbon atoms gasified as the gasification reactions proceed. Generally, the increase in pyrolysis temperature leads to an increase in gasification reactivity with CO{sub 2}. The reactivity of chars in catalytic gasification was higher than the corresponding non-catalytic reactivity of the same chars. Ignition temperature increased with increasing pyrolysis temperature.
ISSN:1556-7036
1556-7230
DOI:10.1080/15567030701438715