Rapid high-temperature pyrolysis of biomass in a free-fall reactor

Zanzi, Rolando; Sjöström, Krister; Björnbom, Emilia

doi:10.1016/0016-2361(95)00304-5

Cited by 241 publications

(159 citation statements)

References 6 publications

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“…The measured mass of tars is in accordance with the value of 1% found by Zanzi [18]. Nevertheless, doubts remains about the quantity of hydrocarbon species that are evaporated with acetone during the protocol.…”

Section: Mass Balancesupporting

confidence: 88%

“…This reactor is an interesting analytical tool to study the global reaction of flash pyrolysis [3,10,[13][14][15][16][17][18][19], since very high heating rates of the particles can be obtained. Moreover, the residence time can be varied over a range of a few seconds, and the particles can be assumed to be isolated from each other, which makes interpretation easier [14,17].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the residence time can be varied over a range of a few seconds, and the particles can be assumed to be isolated from each other, which makes interpretation easier [14,17]. Up to now, few experiments have been performed under the operating conditions of interest, the most complete set of data being given by Zanzi [18,19]. Zanzi et al have studied the effect of the process conditions, such as temperature and particle size, on the product of high heating rate pyrolysis of agricultural residues, including gas composition and char reactivity, in a free fall reactor.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Commandré

Lahmidi

Salvador

et al. 2011

Fuel Processing Technology

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The pyrolysis of wood was carried out in an Entrained Flow Reactor at high temperature (650 to 950°C) and under rapid heating conditions (N 10 3 K s − 1 ). The influence of the diameter and initial moisture of the particle, reactor temperature, residence time and the nature of the gaseous atmosphere on the composition of the gaseous products has been characterised. Particle size, between 80-125 and 160-200 μm, did not show any impact. Pyrolysis and tar cracking essentially happen in very short time period: less than 0.6 s; the products yields are only slightly modified after 0.6 s in the short residence times (several seconds) of our experiments. Higher temperatures improve hydrogen yield in the gaseous product while CO yield decreases. Under nitrogen atmosphere, after 2 s at 950°C, 76% (daf) of the mass of wood is recovered as gases: CO, CO 2 , H 2 , CH 4 , C 2 H 2 , C 2 H 4 and H 2 O. Tests performed under steam partial pressure showed that hydrogen production is slightly enhanced.

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Section: Mass Balancesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Commandré

Lahmidi

Salvador

et al. 2011

Fuel Processing Technology

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“…Both thermal processes produce char as one of major products and with increasing importance on the biomass conversion, large amounts of chars from biofuel production will be produced in the near future. Some papers have been published about the characterization of chars from different biomass pyrolysis [4,5]. The chars from tobacco and pectin were studied and it was found that the physical and chemical characteristics of the chars were more dependent on treatment conditions than on nature of the substrates [6,7].…”

Section: Introductionmentioning

confidence: 99%

Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

Liu

Zhang

2010

Fuel

477

134

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a b s t r a c tTwo types of pinewood chars, hydrothermal char (H300) and pyrolytic char (P700) from biomass-toenergy conversion were characterized and used as adsorbent for the copper removal from aqueous solution. The result showed that the pinewood underwent a deeper carbonization during pyrolysis process and more activated sites available and stable carbon-oxygen complex existed after hydrothermal treatment. Comparing with raw pinewood, hydrothermal treatment increased 95% total oxygen-containing groups (carboxylic, lactone and phenolic group) while 56% oxygen-containing groups decreased after pyrolysis process. SEM analysis indicated that both hydrothermal and pyrolytic processes developed rough surface with new cavities on the chars, and the BET surface area were 21 and 29 m 2 /g for H300 and P700, respectively. Although H300 had lower surface area, its adsorption capacity for copper was much higher than P700 since ion-exchange reaction was the predominant removal mechanism by H300, while physical adsorption dominated by P700. The adsorption data could be well described by Langmuir isotherm model for copper onto both H300 and P700.

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“…The fraction released as volatiles is v 0 ≈0.75…0.8 for wood at relative low heating rate. The amount of volatiles v 0 depends on the heat-up rate of the particle and with high heating rate v 0 is higher even 0.9-0.95 [43]. This heating rate depends on particle size and ambient temperature (gas, walls).…”

Section: Heating Drying and De-volatilization Of A Biomass Particlementioning

confidence: 99%

Release Profile of Volatiles in Fluidised Bed Combustion of Biomass

Saastamoinen¹

2014

J Fundam Renewable Energy Appl

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A simplified model for the release profile of volatiles in fluidised and circulating fluidised beds is presented. The location of the release of volatiles in the furnace depends on the interplay of flow of fuel particles affecting their location and heating of fuel particles affecting rates of drying and pyrolysis and consequently the mass of fuel particles. The coupled equations describing heating, de-volatilization including drying, elutriation and movement of particles are solved to find the release profile. Large heavy particles remain in the dense bed whereas light particles are entrained by the gas and elutriated from the bed to the riser. The situation is dynamic, since fuel particles lose weight due to release of moisture and volatiles and decrease in size due to shrinkage affecting their movement and escape from the lower dense bed to the riser. The model is based on the following the fate of a small batch of fuel particles undergoing de-volatilization and elutriation from the dense bed. The model predicts the location of the release of volatiles and the profile of the release of volatiles in the riser. Part of volatiles is released in the dense bed and the rest above the bed in the riser.

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Rapid high-temperature pyrolysis of biomass in a free-fall reactor

Cited by 241 publications

References 6 publications

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

Release Profile of Volatiles in Fluidised Bed Combustion of Biomass

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