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Indexed by:期刊论文

Date of Publication:2015-07-01

Journal:Australia-China Symposium on Energy

Included Journals:SCIE、EI、CPCI-S、Scopus

Volume:135

Issue:,SI

Page Number:73-79

ISSN No.:0378-3820

Key Words:Co-pyrolysis; Biomass; Coal; Volatiles-char interactions

Abstract:Fast pyrolysis and co-pyrolysis of pine sawdust (SD) and sub-bituminous coal (SB) were carried out in a free fall reactor. There is a gas-solid separator at the bottom of the reactor, where a controlled re-contact of the primary volatiles with the nascent char could be achieved. The experiments of the individual fuels with the volatiles-char re-contact resulted in increased tar yield and decreased the light hydrocarbon gas concentrations compared with that without the volatiles-char re-contact. During the co-pyrolysis of SD and SB, synergies were observed to have produced more tar at different biomass blending ratios (BR): Particularly, the re-contact of the volatiles-char effectively enhanced tar generation and suppressed water formation. The volatiles-char interactions promoted the tar generation mainly at the char bed temperature range from 600 degrees C to 700 degrees C. At the optimum condition with the BR of 0.50 and char bed temperature of 700 degrees C, the tar yield increased up to 28.7%. The co-pyrolysis and volatiles-char interactions favored the acidic components generation in the liquid products. Especially, the volatiles-char re-contact during co-pyrolysis improved the quality of tar by decreasing its asphaltene content. (C) 2014 Elsevier B.V. All rights reserved.