Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, China.
Bioresour Technol. 2021 Mar;324:124660. doi: 10.1016/j.biortech.2020.124660. Epub 2021 Jan 4.
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 °C), rapid pyrolysis reduction stage (175-350 °C), slow pyrolysis reduction stage (350-680 °C) and char formation stage (680-900 °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.
作为化石能源的替代能源，利用生物质热解还原软锰矿对于节能、减排和环境保护具有重要意义。本研究采用热重分析（TGA）对生物质热解还原软锰矿的动力学和热力学进行了研究。采用了五种非等温热动力学方法，即 Flynn-Wall-Ozawa、Kissinger-Akahira-Sunose、分布式活化能模型（DAM）、Starink 和 Friedman 来计算热解动力学和热力学参数。结果表明，生物质热解还原软锰矿可分为四个阶段：干燥阶段（30-175℃）、快速热解还原阶段（175-350℃）、慢速热解还原阶段（350-680℃）和炭形成阶段（680-900℃）。生物质热解还原软锰矿的表观活化能、反应焓、吉布斯自由能和熵变的计算范围分别为 170-180 kJ/mol、164-174 kJ/mol、136.97-137.25 kJ/mol 和 45.67-61.91 J/mol·K。本工作为利用废弃玉米秸秆还原软锰矿提供了理论依据和实践指导。
