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论文类型：期刊论文

发表时间：2015-07-01

发表刊物：Australia-China Symposium on Energy

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：135

期号：,SI

页面范围：73-79

ISSN号：0378-3820

关键字：Co-pyrolysis; Biomass; Coal; Volatiles-char interactions

摘要：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.