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| Pyrolysis of rolling oil sludge and its kinetic analysis |
| LU Wen-tao1, HE Pin-jing1,2, SHAO Li-ming1,2, ZHANG Hua1 |
1. Institute of Waste Treatment & Reclamation, Tongji University, Shanghai 200092, China;
2. Centre for the Technology Research and Training on Household Waste in Small Towns & Rural Area, Ministry of Housing and Urban-Rural Development, Shanghai 200092, China |
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Abstract The pyrolysis behavior of a cold rolling oil sludge was studied using thermogravimetric analysis. Combined with the results from elemental analysis, X-ray diffraction spectrometry and X-ray fluorescence spectrometry, the thermochemical conversion reactions and kinetic characteristics during the pyrolysis were identified. The result showed that the oil fraction evaporated firstly and then came with thermal decomposition reactions in the temperature range of 174~447℃. Between 652 to 863℃, metal oxides in the sludge were reduced by the pyrolytic char. Kinetic analysis of the oil thermal conversion was performed using isoconversional method and the curve of apparent activation energy versus conversion was obtained. It was shown that the apparent activation energy kept increasing with the thermal conversion process. And the point of a=0.6 was obviously a boundary to divide the whole process into two stages, i.e. evaporation and pyrolysis. The existence of residue was able to decrease the apparent activation energy during oil evaporation via comparing the curves of the extracted oil and rolling oil sludge.
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Received: 22 December 2016
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