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Pyrolysis of Straw Obtained from Stagewise Treatment
YANG Chang-yan;YANG Xue-min;LV Xue-song;YAO Jian-zhong;LIN Wei-gang
2005, 5 (4):
379-383.
The pyrolysis characteristics of wheat straw with steam-explosion and solid fermentation treatment were investigated by the thermogravimetry coupled with the Fourier infrared spectroscopy to analyze the evolved gasses. The pyrolysis process with the increase of temperature from TG can be divided into four stages, including drying stage (30~150℃), transitional stage (150~200℃), pyrolysis stage (200~600℃), and carbonization stage (600~900℃). The results of pyrolysis from TG-FTIR show that the process can be divided into two steps: (1) splitting of hydroxide radicals, chain scissions and depolymerization, accompanied by evolution of water, acids, aldehydes, compounds containing C?O?C groups and CO, CO2, CH4, etc.; (2) aromatization and formation of graphite layers, accompanied in turn by evolution of CH4, CO2 and CO. The yields of uncondensable gases and carboxyl compounds decrease after steam explosion/solid fermentation treatment, but the yield of pyrolysis liquid increases by the stagewise treatment.
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