Experimental determination of self-heating and self-ignition risks associated with the dusts of agricultural materials commonly stored in silos

Ramírez, Álvaro; Torrent, Javier García; Tascón, Alberto

doi:10.1016/j.jhazmat.2009.10.096

Cited by 78 publications

(32 citation statements)

References 20 publications

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“…Esta temperatura es muy importante, debido a que es la temperatura a la cual se inicia la liberación de los compuestos volátiles de la madera. Tales volátiles, son los responsables de incendios que puedan ocurrir en espacios cerrados como en las plantas de procesamiento (Ramírez et al 2010, Courty et al 2012. Por lo tanto, esta temperatura puede utilizarse como un punto de referencia para el diseño de dispositivos de detección y extinción de incendios, y es un indicativo de la temperatura a la cual pudiera presentarse una explosión debido a la significativa producción de estos compuestos.…”

Section: Pinus Taedaunclassified

Estudio de cinética en procesos termogravimétricos de materiales lignocelulósicos

Flores

Rutiaga-Quiñones

2018

Maderas, Cienc. tecnol.

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RESUMENLa madera de pino representa el 20% de las especies forestales plantadas en todo el mundo, y actualmente es de vital importancia en aplicaciones industriales como en aserrío, fabricación de papel y medicina. Actualmente, se ha destacado su uso en aplicaciones energéticas. En este estudio se presenta una breve revisión sobre el análisis térmico realizado a diversas especies de madera de pino. Se enfoca principalmente al análisis de los resultados respecto a cómo varía el contenido de masa o pérdida de peso con el cambio de temperatura a partir del análisis de las curvas de termogravimetría y su derivada. Se considerarón diversas especies de madera de pino: Pinus caribaea, Pinus patula, Cupressus sempervirens, Pinus pinaster, Pinus radiata, Pinus sylvestris, Pinus pinea y Pinus taeda.Con el objetivo de mostrar las diferencias y similitudes respecto a la estabilidad térmica de las especies mencionadas, se han discutido los principales parámetros a partir de las curvas de termogravimetría como energía de activación, factor pre-exponencial y orden de reacción. Además, se examinan las etapas de descomposición de acuerdo a los principales componentes de la madera tales como agua, celulosa, hemicelulosa, lignina y extractivos.Palabras clave: Conversión térmica, Cupressus sempervirens, energía renovable, parámetros cinéticos, Pinus sp. ABSTRACTPine wood accounts for 20% of the world's planted forest species, and is currently of vital importance in industrial applications such as sawmills, papermaking and medicine. Actually, its use in energy applications has been emphasized. This study presents a brief review on the thermal analysis of various species of pine wood. We focus mainly on the analysis of the results regarding how the mass content or weight loss varies with the temperature change from the analysis of the thermogravimetric curves and its derivative. Several species of pine wood have been considered: Pinus caribaea, Pinus patula, Cupressus sempervirens, Pinus pinaster, Pinus radiata, Pinus sylvestris, Pinus pinea and Pinus taeda. In order to show the differences and similarities with respect to the thermal stability of the mentioned species, we have discussed the main parameters from the thermogravimetry curves such as activation energy, pre-exponential factor and reaction order. In addition, the decomposition stages are examined according to the main components of the wood such as water, cellulose, hemicellulose, lignin and extractives.

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Section: Pinus Taedaunclassified

Estudio de cinética en procesos termogravimétricos de materiales lignocelulósicos

Flores

Rutiaga-Quiñones

2018

Maderas, Cienc. tecnol.

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“…AIso the variability due to seasonal and geographical parameters is studied. Finally, the selfheating of sewage sludge is studied, since this product may be stored for long periods and self-ignition temperature is an important parameter [26].…”

Section: Test Proceduresmentioning

confidence: 99%

Flammability properties of thermally dried sewage sludge

Fernandez-Añez

Torrent

Pejić

2014

Fuel

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HIGHLIGHTS• Flammability parameters of sludge are presented.• Relationships between chemical and flammability properties of sludge are analyzed.• Physical and chemical properties of sludge dusts affects their explosibility.• Seasons and origins of sludge should lead to a differentiation among samples. ABSTRACTThe treatment and disposal of sewage sludge is becoming an urgent need whereby different technologies were developed and integrated into the waste cycle all over the world. One ofthe most used technologies is the thermal drying ofthe sludge. Thermally dried sewage sludge has interesting properties that allow its use as an alternative fue!, but also needs some consideration from the point of view of its safe operation.The aim ofthis study was the research on the flammability properties of sewage sludge, including ignition sensitivity, explosion severity, thermal sensitivity and thermal stability. Furthermore relationships among those properties and composition parameters have been determined, added to the study of their variation depending on their origin or season. Finally, properties related to spontaneous combustion were determined. To study these relationships and characteristics sludge samples were selected from different locations in Spain and taken during different seasons.

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“…e main mechanism of action of these measures is heat transfer from the combustion zone to realize cooling to terminate the combustion chemical reaction, thereby quenching the flame wave. e current explosion suppression measures do not inhibit the turbulent flow field of the explosive energy, and they ignore the coupling effect of the explosion flame and the shock wave [3]. A pipe that is embedded with a porous wall weakens the explosive transverse wave.…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies on the Heat Effect of Explosion Suppression by a Heat Pipe

Zhang

Ning

Quan

et al. 2020

Mathematical Problems in Engineering

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A composite structure with a heat pipe and foamed iron-nickel composite fire suppression is proposed on the basis of the phase-change heat transfer of the heat pipe, which simultaneously attenuates the metal foam explosion energy. A numerical simulation is conducted to evaluate the feasibility of the designed construction for suppressing explosions under various thicknesses and pore diameters of the metal foam. The results demonstrate that when the foam iron-nickel metal is installed in the pipeline, the temperature reduction rate in the pipeline can reach 8.9%. The new heat pipe foam composite structure can reduce the flame temperature to 1600 K within 0.095 s. It is concluded that the heat pipe composite metal foam structure pipeline has a strong effect on suppressing combustion and explosion overpressure. Due to the combined effect of the heat pipe vacuum chamber suction energy and the foamed iron-nickel, the flame temperature decay rate increases. The maximum attenuation rate of the foamed iron-nickel for the gas explosion shock wave reaches 41.76%, and the maximum flame temperature attenuation rate reaches 64.7%. The composite heat pipe structure can quickly disperse and transfer heat, thereby effectively destroying the heat storage environment as soon as possible to prevent a secondary explosion from occurring.

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Experimental determination of self-heating and self-ignition risks associated with the dusts of agricultural materials commonly stored in silos

Cited by 78 publications

References 20 publications

Estudio de cinética en procesos termogravimétricos de materiales lignocelulósicos

Estudio de cinética en procesos termogravimétricos de materiales lignocelulósicos

Flammability properties of thermally dried sewage sludge

Numerical Studies on the Heat Effect of Explosion Suppression by a Heat Pipe

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