Kinetics of petroleum coke/biomass blends during co-gasification |
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| Authors: | Jian-liang Zhang Jian Guo Guang-wei Wang Tao Xu Yi-fan Chai Chang-le Zheng Run-sheng Xu |
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| Affiliation: | School of Metalurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The co-gasification behavior and synergistic effect of petroleum coke, biomass, and their blends were studied by thermogravimet-ric analysis under CO2 atmosphere at different heating rates. The isoconversional method was used to calculate the activation energy. The results showed that the gasification process occurred in two stages: pyrolysis and char gasification. A synergistic effect was observed in the char gasification stage. This effect was caused by alkali and alkaline earth metals in the biomass ash. Kinetics analysis showed that the acti-vation energy in the pyrolysis stage was less than that in the char gasification stage. In the char gasification stage, the activation energy was 129.1–177.8 kJ/mol for petroleum coke, whereas it was 120.3–150.5 kJ/mol for biomass. We also observed that the activation energy calcu-lated by the Flynn–Wall–Ozawa (FWO) method were larger than those calculated by the Kissinger–Akahira–Sunosen (KAS) method. When the conversion was 1.0, the activation energy was 106.2 kJ/mol when calculated by the KAS method, whereas it was 120.3 kJ/mol when cal-culated by the FWO method. |
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| Keywords: | gasification petroleum coke biomass synergistic effect kinetics |
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