Study of the combustion mechanism of oil shale semicoke in a thermogravimetric analyzer |
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Authors: | X X Han X M Jiang Z G Cui |
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Institution: | (1) Institute of Thermal Energy Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China |
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Abstract: | Oil shale semicoke, formed in retort furnaces, is a source of severe environmental pollution and is classified as a dangerous
solid waste. For the industrial application of oil shale semicoke in combustion, this present work focused on the thermal
analysis of its combustion characteristics. The pyrolysis and combustion experiments of semicoke were conducted in a Pyris
thermogravimetric analyzer. From the comparison of pyrolysis curves with combustion curves, the ignition mechanism of semicoke
samples prepared at different carbonization temperatures was deduced, and was found to be homogeneous for semicoke samples
obtained at lower carbonization temperature, shifting to heterogeneous with an increase in the carbonization temperature.
The effect of carbonization temperatures and heating rates on the combustion process was studied as well. At last, combustion
kinetic parameters of semicoke were calculated with the binary linear regression method, showing that activation energy will
increase with increasing the heating rate. |
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Keywords: | combustion mechanism oil shale semicoke thermal analysis |
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