Title: High-temperature pyrolysis behavior of two different rank coals in fixed-bed and drop tube furnace reactors
Abstract: In order to explore the high-temperature pyrolysis behavior and mechanism, two different rank coals (Shenhua bituminous coal and Baiyinhua lignite coal) were pyrolyzed in fixed-bed and drop tube furnace (DTF) reactors. Pyrolysis gas production was online quantified by a drainage method while the gas composition was detected by the gas chromatography. The physical and chemical characteristics of pyrolysis char were observed by N2 absorption and FTIR. Results show that pyrolysis gas release rate and total production increase with the higher temperature. The gas production of SH coal (618–749 ml/g) is always higher than that of BYH coal (418–510 ml/g) due to its higher volatile content. The main high-temperature pyrolysis gas products are H2 (∼50% vol), CO, CH4 and CO2. Carbon-reduction reaction at high temperatures can further form H2 and CO while the rupture of aromatic heterocyclic ring can generate CH4. High-temperature pyrolysis can greatly remove the coal moisture, develop their pore structures, crack the chemical functional groups (O–H, –CH3, CO, C–O, etc.) and upgrade the coal rank. Different coal structures and pyrolysis heating rates result in various gas evolution and char formation behaviors. Higher heating rate can help to quickly generate large amounts of free radicals and change the pyrolysis behaviors.
Publication Year: 2020
Publication Date: 2020-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 22
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