期刊
ENERGY
卷 251, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.123821
关键词
In-situ catalytic pyrolysis; Kinetics; Carbon conversion; Pyrolysis char; PTA sludge
资金
- Jiangsu Provincial Key Research and Development Program [BE2020115]
- Science and technology development project of Sinopec [419035-2]
- startup foundation for introduced talents of Nanjing Tech University
This study evaluated the pyrolysis kinetics and thermodynamics of PTA sludge, and conducted a cyclic in-situ catalytic pyrolysis experiment. The results showed that pyrolysis char could promote tar cracking, leading to increased yield of pyrolysis syngas and carbon conversion rate.
Pyrolysis is an effective way for the sludge harmless, reduction treatment and resource utilization. In this study, the pyrolysis kinetics and thermodynamics of PTA sludge was evaluated. Afterword, a cyclic in-situ catalytic pyrolysis of PTA sludge by using recycled char as a catalyst was conducted. The product characterization, e.g. pyrolysis syngas as well as the catalytic effect of pyrolysis char, were analyzed. The results demonstrated that the Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW), and Starink model-free methods have good agreement on kinetic parameters, the average activation energy was calculated at 295.18, 286.62, and 290.55 kJ/mol, respectively. Meanwhile, thermodynamic parameters, e.g. the variations in enthalpy (DH), entropy (DS), and Gibbs free energy (DG), were evaluated based on the deduced kinetic results, whereby the suitable pyrolysis temperature was determined at 973 K. The results of cyclic in-situ catalytic pyrolysis showed that the pyrolysis char could promote tar cracking, which greatly increased the yield of pyrolysis syngas. After five rounds of in-situ catalytic pyrolysis, the yield of pyrolysis syngas increased from 0.089 L/g to 0.176 L/g and the carbon conversion increased from 24.8% to 36.5%, respectively.
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