Abstract
The gasification behavior of pine wood sawdust was investigated in CO2 with different heating rates of 5, 10, 15, and 20 °C/min from room temperature to 1400 °C by thermogravimetric analysis (TGA) and mass spectrometry (MS). It was also examined under Ar to compare the differences observed under CO2 at heating rate of 10 °C/min. Kinetics of pine wood sawdust thermal decomposition was determined by the models of FWO, KAS and master plot method. TGA results revealed different reaction sections from pyrolysis to char gasification under CO2. The pyrolysis behavior was similar under CO2 and Ar and had a similar energy required value about 590 kJ/kg from 250 °C to 420 °C. CO, CH4, and H2 were the primary gases obtained from thermal decomposition, and the amounts of which in CO2 atmosphere were higher than those obtained in Ar. The average activation energy for pyrolysis under CO2 was 184.72 kJ/mol.
Highlights
Energies 2021, 14, 5328 ysis of devolatilization was performed to calculate kinetic parameters employing the iso-conversional methods of Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO), and the Master Plot Method (MPM)
The pyrolysis of pine sawdust sample at a heating rate of 10 ◦ C/min under 60 mL/min of Ar was carried out to compare differences observed under CO2 in a separate thermogravimetric analysis (TGA)-mass spectrometry (MS) test
The released gas from thermal conversion of pine wood sawdust was simultaneously monitored by MS, and the information related to the variation of the gas components under CO2 and Ar was obtained at a heating rate of 10 ◦ C/min
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Biomass gasification has become one of the most potential thermochemical conversion technologies because it can rapidly convert a large amount of biomass into stored gaseous or liquid fuels [7,8] It is a complex thermochemical conversion process, mainly comprising two stages: reaction of thermal decomposition and gasification of pyrolysis products with gasified medium [9,10]. The mixed gasifying agent consisting of air (oxygen) and steam for biomass gasification has been extensively investigated on a laboratory scale [22,23] It can produce syngas with lower heating value (LHV) of 11.5 MJ/m3 , but the process is complex and expensive [24]. Energies 2021, 14, 5328 ysis of devolatilization was performed to calculate kinetic parameters employing the iso-conversional methods of Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO), and the Master Plot Method (MPM)
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