期刊
BIORESOURCE TECHNOLOGY
卷 324, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124660
关键词
Pyrolusite; Waste biomass; Thermodynamic analysis; Mixed pyrolysis kinetics; Non-isothermal models
资金
- National Natural Science Foundation of China [U1802255]
- Innovative Research Team (in Science and Technology) in University of Yunnan Province
The study on reducing pyrolusite using biomass pyrolysis revealed that the process can be divided into four stages, with calculated ranges of various thermodynamic parameters. This research provides a theoretical basis and practical guidance for the reduction of pyrolusite by utilizing waste corn stalk.
As an alternative energy source for fossil energy, use of biomass pyrolysis to reduce pyrolusite is of great significance for energy conservation, emission reduction and environmental protection. Kinetics and thermodynamics of reducing pyrolusite using biomass pyrolysis was studied using thermogravimetric analysis analysis. Five non-isothermal methods, Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Distributed Activation Energy Model, Starink and Friedman, were employed to calculate the pyrolysis kinetics and thermodynamic parameters. The results showed that pyrolusite reduction by biomass pyrolysis can be divided into four stages: drying stage (30-175 degrees C), rapid pyrolysis reduction stage (175-350 degrees C), slow pyrolysis reduction stage (350-680 degrees C) and char formation stage (680-900 degrees C). The apparent activation energy, reaction enthalpy, Gibbs free energy and entropy change of pyrolusite reduction by biomass pyrolysis was calculated ranges from 170 to 180 kJ/mol, 164 to 174 kJ/mol, 136.97 to 137.25 kJ/mol and 45.67 to 61.91 J/mol.K, respectively. This work provides theoretical basis and practical guidance for the reduction of pyrolusite by waste corn stalk.
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