Wood Products: Thermal Degradation and Fire

White, Robert H.; Dietenberger, Mark A.

doi:10.1016/b0-08-043152-6/01763-0

Cited by 93 publications

(147 citation statements)

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“…These results are in agreement with literature [6]. All these gases mainly come from the degradation of the lignocellulosic compounds and in particular from the pyrolysis of cellulose and hemicellulose [16][17][18]. The degradation products released by PP contain more combustible gases (about 27.1 %)…”

Section: Combustion Regimessupporting

confidence: 91%

Skeletal and global mechanisms for the combustion of gases released by crushed forest fuels

Tihay

Santoni

Simeoni

et al. 2009

Combustion and Flame

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Skeletal and global mechanisms for the combustion of gases released by crushed forest fuelsCitation for published version: Tihay, V, Santoni, P-A, Simeoni, A, Garo, J-P & Vantelon, J-P 2009, 'Skeletal and global mechanisms for the combustion of gases released by crushed forest fuels ' Combustion and flame, vol. 156, no. 8, pp. 1565-1575. DOI: 10.1016/j.combustflame.2009 General rightsCopyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policyThe University of Edinburgh has made every reasonable effort to ensure that Edinburgh Research Explorer content complies with UK legislation. If you believe that the public display of this file breaches copyright please contact openaccess@ed.ac.uk providing details, and we will remove access to the work immediately and investigate your claim. Shortened Title: Gas combustion modelling for forest fuels Abstract:This study aims to improve the description of the gas phase combustion in physical models of forest fire spreading. The current models liken the degradation gases of forest fuels to carbon monoxide burning in air, whatever vegetation species. The first part of the study was devoted to determine whether the degradation gases have to be considered accurately in forest fire modelling. A laboratory experimental apparatus was designed to study the influence of the degradation gases on the laminar flames from crushed forest fuels. Thanks to these experiments, the role of the degradation gases on the gas phase combustion was highlighted.The second part was dedicated to improve the combustion models of degradation gases.

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Section: Combustion Regimessupporting

confidence: 91%

Skeletal and global mechanisms for the combustion of gases released by crushed forest fuels

Tihay

Santoni

Simeoni

et al. 2009

Combustion and Flame

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“…The formation of CO cannot be explained by dehydration or decarboxylation reactions. The increased CO formation is reported in literature (White and Dietenberger 2001) as the reaction of carbon dioxide and steam with porous char. This reaction produces CO. Traces of hydrogen and methane are also detected in noncondensable products.…”

Section: Noncondensable Productsmentioning

confidence: 69%

Biomass Torrefaction Process Review and Moving Bed Torrefaction System Model Development

Tumuluru¹,

Sokhansanj²,

Wright³

2010

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Torrefaction is gaining attention as an important preprocessing step to improve the quality of biomass in terms of physical properties and chemical composition. Torrefaction is a slow heating of biomass in an inert or reduced environment to a maximum temperature of approximately 300°C. Torrefaction can also be defined as a group of products resulting from the partially controlled and isothermal pyrolysis of biomass occurring in a temperature range of 200-280ºC. Thus, the process can be called a mild pyrolysis as it occurs at the lower temperature range of the pyrolysis process. At the end of the torrefaction process, a solid uniform product with lower moisture content and higher energy content than raw biomass is produced. Most of the smoke-producing compounds and other volatiles are removed during torrefaction, which produces a final product that will have a lower mass but a higher heating value.There is a lack of literature on the design aspects of torrefaction reactor and a design sheet for estimating the dimensions of the torrefier based on capacity. This study includes (a) a detailed review of biomass torrefaction in terms of understanding the process, product properties, off-gas compositions, and methods used, and (b) a methodology for designing a moving bed torrefier, taking into account the basic fundamental heat and mass transfer calculations. Specific objectives include establishing a set of basic calculations for configuring a torrefaction system, like the diameter and height of the moving packed bed for different capacities, and the heat loads and gas flow rates of the system. Develop Excel© worksheet so a user can define design specifications. In this report, 25-1000 kg/hr are used in equations for the design of the torrefier. Examples of calculations and specifications for the torrefier are included.iv This page intentionally left blank.v ACKNOWLEDGEMENTS

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“…The formation of CO 2 may be explained by decarboxylation of acid groups in the wood, but the formation of CO cannot be explained by dehydration or decarboxylation reactions. The increased CO formation reported in literature (White and Dietenberger, 2001) is due to reaction of carbon dioxide and steam with porous char. Traces of hydrogen and methane are also detected in the non-condensable product.…”

Section: Non-condensable Gasesmentioning

confidence: 86%