Thermal decomposition of bio-oil: Focus on the products yields under different pyrolysis conditions

Abstract : In this study, pyrolysis process of wood bio-oil was studied. The effects of temperature in the range 550-1000 degrees C, heating rate in the range 2-2000 degrees C s(-1) and ash content of the bio-oil on char, tar and gas yields were investigated. The main gas species generated are quantified by Micro-GC: H-2, CO, CO2, CH4 and trace amounts of C2H4 and C2H6. A temperature increase from 550 to 1000 degrees C enhanced greatly the gas yield, whilst solid and liquid yields decreased significantly. The heating rate was varied in a range covering rapid pyrolysis using the Horizontal Tubular Reactor (HTR) to flash pyrolysis using an Entrained Flow Reactor (EFR). A decrease of char yield from 11 wt.% down to 4 wt.% was observed when heating rate is changed from 2 to 100 degrees C s(-1). In EFR a flash heating rate of 2000 degrees C s(-1) led to a char yield as low as 1 wt.%. Bio-oil with a natural ash contents of 0.05 wt.% and bio-oil added with 3 wt.% of ash were finally pyrolyzed. Ash seems to favor re-polymerization reactions that lead to an increase in char yield. A decrease in the amount of gas is observed when ash is added while an increase was a priori expected.
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Fuel, Elsevier, 2012, 102, pp.274-281. 〈10.1016/j.fuel.2012.06.098〉
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Younes Chhiti, Sylvain Salvador, Jean-Michel Commandre, Francois Broust. Thermal decomposition of bio-oil: Focus on the products yields under different pyrolysis conditions. Fuel, Elsevier, 2012, 102, pp.274-281. 〈10.1016/j.fuel.2012.06.098〉. 〈hal-01688416〉

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