Oxidation of chars during smoldering combustion of cellulosic materials

Shafizadeh, Fred; Sekiguchi, Yuki

doi:10.1016/0010-2180(84)90025-7

Cited by 65 publications

(37 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second fraction, mainly composed of cellulose, decomposes in a temperature range of 300-350 ºC for pyrolysis and reaches 400 ºC for high speed heating in combustion because the main reactions involve breakage of glycosidic linkages with the consequent partial depolymerization of the cellulosic component of wood [21,22].…”

Section: Discussionmentioning

confidence: 99%

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Conesa

Rey

2015

J Therm Anal Calorim

View full text Add to dashboard Cite

The thermal decomposition of a Solid Recovered Fuel (SRF) has been studied using thermogravimetry, in order to get information about the main steps in the decomposition of such material. The study comprises two different atmospheres: inert and oxidative. The kinetics of decomposition is determined at three different heating rates using the same kinetic constants and model for both atmospheres at all the heating rates simultaneously. A good correlation of the TG data is obtained using three n th order parallel reactions.

show abstract

Section: Discussionmentioning

confidence: 99%

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Conesa

Rey

2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Pyrolysis of cellulose can be described in a simplified form as a mechanism of chain depolymerization via transglycosylation reactions [45]. One important endothermic process is observed in nitrogen atmosphere at Tb = 338 °C, associated to the heat of evaporation of volatile products generated by the pyrolysis of the glycosyl units [40], and it matches with the collapse of the structure and the complete loss of the crystalline structure, as shown in Fig. 1A.…”

Section: Tg-dtg/dta Analysis Of the Biomass Componentsmentioning

confidence: 97%

“…The weight on dry basis is calculated from each thermogram excluding the mass loss below 180ºC. [39,40] and for lignin [41], which in turn results in the advancement of the maximum rate of decomposition. At this stage, endothermal volatilization and exothermal charring processes are responsible of the resulting energy balance [42,43].…”

Section: Tg-dtg/dta Analysis Of the Biomass Componentsmentioning

confidence: 99%

Comparison of thermal behavior of natural and hot-washed sisal fibers based on their main components: Cellulose, xylan and lignin. TG-FTIR analysis of volatile products

et al. 2014

View full text Add to dashboard Cite

Abstract:This paper presents in a comprehensive way the thermal behavior of natural and hot-.washed sisal fibers, based on the fundamental components of lignocellulosic materials: cellulose, xylan and lignin. The research highlights the influence exerted on the thermal stability of sisal fibers by other constituents such as non-cellulosic polysaccharides (NCP) and mineral matter. Thermal changes were investigated by thermal X-ray diffraction (TXRD), analyzing the crystallinity index (%Ic) of cellulosic samples, and by simultaneous thermogravimetric and differential thermal analysis coupled with Fourier-transformed infrared spectrometry (TG/DTA-FTIR), which allowed to examine the evolution of the main volatile compounds evolved during the degradation under inert and oxidizing atmospheres. The work demonstrates the potential of this technique to elucidate different steps during the thermal decomposition of sisal, providing extensible results to other lignocellulosic fibers, through the analysis of the evolution of CO 2 , CO, H 2 O, CH 4 , acetic acid, formic acid, methanol, formaldehyde and 2-butanone, and comparing it with the volatile products from pyrolysis of the biomass components. The hydroxyacetaldehyde detected during pyrolysis of sisal is indicative of an alternative route to that of levoglucosan, generated during cellulose pyrolysis.Hot-washing at 75 ºC mostly extracts non-cellulosic components of low decomposition temperature, and reduces the range of temperature in which sisal decomposition occurs, causing a retard in the pyrolysis stage and increasing Tb NCP and Tb CEL , temperatures at the maximum mass loss rate of non-cellulosic polysaccharides and cellulose decompositions, respectively. However, enriching sisal fibers in cellulose produces a decrease of Tb CEL under an oxidizing atmosphere, and furthermore, a delay of the combustion process, displacing Tb COM to higher temperatures.The results and findings of the paper would help further understanding of thermal processes where agave fibers are involved, as the decomposition of their composites.

show abstract

“…One factor which must be considered is that apart from heating from steel pipes, such fires are also prone to occur in other situations where access of oxygen to the surface is impeded, such as wood materials covered by a layer of sheet metal on top of which is a heating device [19]. The late Fred Shafizadeh, as part of his fundamental research into the pyrolysis of wood materials had reported some preliminary experiments where he concluded that access of oxygen to a char which had been created under anaerobic conditions will lead to higher exothermicity than would the case for aerobically created char [20,21]. It is also possible, but this has not been investigated, that the factor(s) which would impede ingress of oxygen would also impede egress of moisture.…”

Section: à2mentioning

confidence: 99%

Prudent practices for the design and installation of heat‐producing devices near wood materials

Babrauskas¹,

Gray²,

Janssens

2006

Fire and Materials

View full text Add to dashboard Cite

SUMMARYThe conditions required to cause ignition of solid wood materials under short-term heating are examined, and it is found that the appropriate ignition temperature applicable under these conditions is 2508C. It is then shown that ignition requirements are different if long-term heating is involved and that ignition can occur at exposure temperatures much lower than the ignition temperature pertinent to short-term heating. It is shown that hot surfaces of 778C or higher, if located for a long duration next to a wood member are liable to lead to its ignition in a self-heating mode. Recommendation is made that prudent practices for design or installation must also involve a suitable safety factor.

show abstract

Oxidation of chars during smoldering combustion of cellulosic materials

Cited by 65 publications

References 12 publications

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Comparison of thermal behavior of natural and hot-washed sisal fibers based on their main components: Cellulose, xylan and lignin. TG-FTIR analysis of volatile products

Prudent practices for the design and installation of heat‐producing devices near wood materials

Contact Info

Product

Resources

About