Abstract
The kinetics of polish hard coal and its char gasification using carbon dioxide as gasifying agent was studied at atmospheric pressure between 293 and 1223K at different linear heating rates. Calculations using isoconversional method showed that coal gasification has two separate steps: pyrolysis in the range from 600 to 850K and gasification in the range from 1000 to 1273K. This proves the additivity of pyrolysis and gasification steps. The apparent activation energy calculated using the F1 model for coal char gasification is equal to 245kJ/mol, and logA is equal to 7.41/s, which is similar to the value obtained by the isoconversional method. Coal gasification reaction with carbon dioxide is faster and takes place in a lower temperature range than the gasification process of the char obtained in a separate process. The stabilized and chemically deactivated char is harder to gasify, and the same conversion is achieved at the higher temperature. The estimated shift may be as high as 150K.
Published Version
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