Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content
Thermal behaviors and combustion kinetics of Thai lignite with different SO3-free CaO contents were investigated. Nonisothermal thermogravimetric method was carried out under oxygen environment at heating rates of 10, 30, and 50°C min−1 from ambi...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2013/216975 |
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| Summary: | Thermal behaviors and combustion kinetics of Thai lignite with different SO3-free
CaO contents were investigated. Nonisothermal thermogravimetric method was carried out under
oxygen environment at heating rates of 10, 30, and 50°C min−1 from
ambient up to 1300°C. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS)
methods were adopted to estimate the apparent activation energy (E) for the thermal decomposition of these coals. Different thermal
degradation behaviors were observed in lignites with low (14%) and high
(42%) CaO content. Activation energy of the lignite combustion was found
to vary with the conversion fraction. In comparison with the KAS method, higher E values were obtained by the FWO method for all conversions considered.
High CaO lignite was observed to have higher activation energy than the low CaO coal. |
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| ISSN: | 1537-744X |