Flash pyrolysis of cellulose pellets submitted to a concentrated radiation: experiments and modelling

Boutin, Olivier; Ferrer, Monique; Lédé, Jacques

doi:10.1016/s0009-2509(01)00360-8

Cited by 101 publications

(76 citation statements)

References 14 publications

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“…A parabolic solar concentrator is attached with the reactor to concentrate the solar radiation. The concentrated solar radiation is capable of generating high temperatures (>700 °C) in the reactor for pyrolysis processes [93,94]. However, solar reactors have some advantages over slow reactors.…”

Section: Solar Reactormentioning

confidence: 99%

Biofuels Production through Biomass Pyrolysis —A Technological Review

et al. 2012

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There has been an enormous amount of research in recent years in the area of thermo-chemical conversion of biomass into bio-fuels (bio-oil, bio-char and bio-gas) through pyrolysis technology due to its several socio-economic advantages as well as the fact it is an efficient conversion method compared to other thermo-chemical conversion technologies. However, this technology is not yet fully developed with respect to its commercial applications. In this study, more than two hundred publications are reviewed, discussed and summarized, with the emphasis being placed on the current status of pyrolysis technology and its potential for commercial applications for bio-fuel production. Aspects of pyrolysis technology such as pyrolysis principles, biomass sources and characteristics, types of pyrolysis, pyrolysis reactor design, pyrolysis products and their characteristics and economics of bio-fuel production are presented. It is found from this study that conversion of biomass to bio-fuel has to overcome challenges such as understanding the trade-off between the size of the pyrolysis plant and feedstock, improvement of the reliability of pyrolysis reactors and processes to become viable for commercial applications. Further study is required to achieve a better understanding of the economics of biomass pyrolysis for bio-fuel production, as well as resolving issues related to the capabilities of this technology in practical application. OPEN ACCESSEnergies 2012, 5 4953

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Section: Solar Reactormentioning

confidence: 99%

Biofuels Production through Biomass Pyrolysis —A Technological Review

et al. 2012

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“…In the case of radiative exchange, other difficulties arise from the bad knowledge of solid optical properties (however this drawback disappears as soon as biomass is covered with a thin black char layer). For laboratory scale studies, facilities such as the image furnace [16] bring the advantage to provide prescribed and controlled heat flux densities at the sample surface. However, a drawback of using the heat flux density criterium in process reactors, is that it may decrease as the process occurs, mainly during the heating up where T s sharply increases (see Equation (3)).…”

Section: Discussionmentioning

confidence: 99%

“…It is, of course, less important in the case of facilities operating under prescribed heat flux densities. This is, for example, the case when biomass samples are submitted to a controlled radiant flux density as in an image furnace [2,16] or a solar concentrator [17].…”

Section: Actual Biomass Temperaturementioning

confidence: 99%

Biomass Pyrolysis: Comments on Some Sources of Confusions in the Definitions of Temperatures and Heating Rates

Lédé

2010

Energies

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Biomass pyrolysis is usually characterized on the basis of temperature and heating rate. Unfortunately, these parameters are badly defined in processing reactors as well as in laboratory devices. From the results of simplified models, the present paper points out the significant mistakes that can be made when assuming that the actual temperature and heating rate of reacting biomass particles are the same as those of the external heating medium. The difficulties in defining these two parameters are underlined in both cases of a heat source temperature supposed to be constant or to increase with time.

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“…-During the reaction, the temperature rapidly stabilizes [30,31] around 700 K because of competition between available heat flux and heat flux required for the reaction. This "reaction temperature" is close to the "fusion like temperature" of biomass [30,31]. For a given value of t, it is quite smaller than in pure heating and considerably lower than that of the heat source (around 500 K difference).…”

Section: Referencesmentioning

confidence: 99%

“…This is possible through the use of a controlled concentrated radiation provided by an arc lamp (Image Furnace [13,18,25,30]) or by the sun (Solar Furnace [37]). 8 values may vary widely (ranging from several MW m −2 down to a few kW m −2 ).…”

Section: Heat Flux Densitymentioning

confidence: 99%

Characterization of biomass fast pyrolysis

Lédé

Authier

2011

Biomass Conv. Bioref.

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The literature shows that different possible criteria are used for defining biomass fast pyrolysis. On the basis of a simplified modeling of a cellulose (biomass model compound) particle pyrolysis, the present paper points out that the most often considered parameters (i.e., temperature and heating rate) are inappropriate. They are very difficult to define and measure, and according to their definitions, important errors can be made (kinetic measurements and reactor scaling up). Other possible parameters are also examined such as particle initial size, available heat flux density, heat transfer coefficient, and products elimination efficiency. In order to be able to compare different experimental conditions on a similar basis, it is shown that at the biomass sample level, fast pyrolysis is favoured (enhancement of bio-oil fractions) if two necessary conditions are simultaneously fulfilled. They include high external heat transfer coefficient and efficient products removal.

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Flash pyrolysis of cellulose pellets submitted to a concentrated radiation: experiments and modelling

Cited by 101 publications

References 14 publications

Biofuels Production through Biomass Pyrolysis —A Technological Review

Biofuels Production through Biomass Pyrolysis —A Technological Review

Biomass Pyrolysis: Comments on Some Sources of Confusions in the Definitions of Temperatures and Heating Rates

Characterization of biomass fast pyrolysis

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