Autothermal Fluidized Bed Pyrolysis of Cuban Pine Sawdust

Suárez, José Antonio; Beatón, Pedro Aníbal; Zanzi, Rolando; Grimm, Alejandro

doi:10.1080/009083190523145

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…However, the alkene yield increases slightly, probably as a result of radical formation when oxygen is added to the reaction . Similar trends have been observed by other authors. , …”

Section: Resultssupporting

confidence: 90%

“…50 Similar trends have been observed by other authors. 38,48 Furthermore, when these results are expressed in terms of concentration (Figure 6), it is observed that the concentration of all the compounds except CO 2 decreases when the equivalence ratio is increased, which is due to the combustion reactions. When 25% of the stoichiometric oxygen is fed, carbon dioxide accounts for almost 70 vol % of the gas fraction.…”

Section: Resultsmentioning

confidence: 92%

“…Furthermore, Suarez et al 48 also carried out pinewood autothermal pyrolysis in a fluidized bed, except operating at higher temperatures, around 675−800 °C, and they obtained mainly gaseous products. Finally, Scott et al 49 patented a process to maximize levoglucosan production, subjecting the biomass first to a deionization treatment and, subsequently, to a fast pyrolysis process under conditions of controlled oxidation to remove lignin-derived products.…”

Section: Resultsmentioning

confidence: 99%

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Biomass Oxidative Flash Pyrolysis: Autothermal Operation, Yields and Product Properties

et al. 2012

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Biomass autothermal flash pyrolysis has been carried out by adding oxygen to the reaction environment in a bench-scale plant provided with a conical spouted bed reactor, at 500 °C and using two oxygen concentrations in the inlet gas stream (2.5 and 4.1 vol %, which correspond to equivalence ratios of 15 and 25, respectively). An increase in the oxygen concentration leads to an increase in gas and water yields, whereas there is a decrease in the yield of both char (partially burned) and organic compounds in the bio-oil, albeit only slightly in the latter case. Bio-oil composition undergoes only minor changes for certain individual components. The experimental results highlight the advantages of the conical spouted bed reactor (CSBR) for scaling up the autothermal operation. A study on energy requirements reveals that the oxygen concentration needed to achieve autothermal operation decreases as the scale is larger. The oxygen content required in the inlet gas stream for autothermal operation in an industrial-scale plant of 500 kg h −1 is 2.7 vol %, and neither bio-oil yield nor composition is significantly affected, being similar to the case of operating in an inert atmosphere.

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“…However, the alkene yield increases slightly, probably as a result of radical formation when oxygen is added to the reaction . Similar trends have been observed by other authors. , …”

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

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Biomass Oxidative Flash Pyrolysis: Autothermal Operation, Yields and Product Properties

et al. 2012

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“…Also there was a study examining a very high concentration of oxygen in the reaction gas atmosphere (i.e., high equivalence ratio with the supply of oxygen higher than the stoichiometric calculation) during the autothermal pyrolysis of Cuban pine sawdust in a lab pilot-scale fluidized bed . As expected, the high equivalence ratio has resulted in the high gas yields and low production in aqueous solution, and the reaction temperature increased with increasing oxygen supply.…”

Section: Concept Of Autothermal Pyrolysis Of Biomassmentioning

confidence: 99%

Fundamental Advances in Biomass Autothermal/Oxidative Pyrolysis: A Review

Huang

Liu

et al. 2020

ACS Sustainable Chem. Eng.

149

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Pyrolysis is an important thermochemical route to decompose lignocellulose biomass into biogas, bio-oil, and biochar, which can be then converted into value-added biofuels, chemicals, and biomaterials. Conventionally, the pyrolysis reaction is carried out under inert atmosphere. The quality of biocrudes and biochars from the conventional pyrolysis could significantly vary, depending on the types of feedstocks and reaction conditions. After intensive studies on the conventional biomass pyrolysis for decades, the external heat supply for the endothermic pyrolytic reactions is still one of the most important roadblocks to inhibit the scale-up and commercialization of biomass pyrolysis technologies. Different from the pyrolysis under inert gas atmosphere, autothermal pyrolysis tends to depolymerize the biomass (polymers) with restricted supply of oxygen/air, also called oxidative pyrolysis. The presence of oxygen in the pyrolyzer will induce the exothermic char-oxygen and/or volatile-oxygen reactions, thus in situ providing the heat for the primary thermal degradation of biomass and the subsequent secondary reactions. Besides the change in product distributions, the key advantage of autothermal pyrolysis is its self-sustainability in terms of heat supply and requirement, facilitating the ease of further scaling up. This review will thus mainly focus on the sum of the recent advances in autothermal pyrolysis and also discuss some innovative pathways for improving/adjusting the product quality.

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“…The results indicated that the liquid and char products obtained may be a potentially valuable source of chemical feedstocks (Suarez et al, 2006a). A continuous bench fluidized bed pyrolysis has been designed and is currently under testing.…”

Section: Introductionmentioning

confidence: 98%

Characterization of Bio-oils from Spruce Wood (Picea orientalisL.) via Pyrolysis

Demirbas¹

2010

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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In this study, characterization of bio-oils from spruce wood (Picea orientalis, Lipsky) was investigated with aspect of structural, chemical, and thermochemical conversional properties. Proximate and elemental analyses, bio-oil analysis, fuel characteristics, and pyrolysis conditions of the samples were studied. The average kinematic viscosity (measured at 313 K) of bio-oil was 160 mm 2 /s. The average liquid density (measured at 293 K) of bio-oil was 1,195 kg/m 3 , compared to 750-990 kg/m 3 for petroleum diesel fuels. The average yields of bio-oil and char from spruce wood were 39.7 and 36.3%, by weight of dry and ash free basis, respectively. The chemical formula of the bio-oil was CH 1:478 N 0:009 O 0:232 . The yields of bio-oils from the spruce wood samples increased from 34.8 to 45.4% when the pyrolysis temperature was increased from 625 to 800 K, respectively, and then decreased 45.4 to 37.3% when the final pyrolysis temperature was increased from 800 to 875 K, respectively.

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Autothermal Fluidized Bed Pyrolysis of Cuban Pine Sawdust

Cited by 7 publications

References 11 publications

Biomass Oxidative Flash Pyrolysis: Autothermal Operation, Yields and Product Properties

Biomass Oxidative Flash Pyrolysis: Autothermal Operation, Yields and Product Properties

Fundamental Advances in Biomass Autothermal/Oxidative Pyrolysis: A Review

Characterization of Bio-oils from Spruce Wood (Picea orientalisL.) via Pyrolysis

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