Model predictions and experimental results on self-heating prevention of stockpiled coals

Fierro, Vanessa; López‐Miranda, José; Romero, C.; Andrés, José Manuel Palao; Arriaga, A; Schmal, D.

doi:10.1016/s0016-2361(00)00062-4

Cited by 76 publications

(26 citation statements)

References 16 publications

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“…On the other hand, heat transferred away from the combustion zone is also amplified, resulting in a substantial cooling effect. Fierro et al (1999Fierro et al ( , 2001 investigated spontaneous combustion in stockpiles of Spanish black coal. They reasoned that the stock would not be in danger of spontaneous combustion if the air convection was either sufficiently low (=limited oxygen supply) or high (=cooling effect dominating).…”

Section: Ignition and Propagation Of Coal Firesmentioning

confidence: 99%

Controlling coal fires using the three-phase foam and water mist techniques in the Anjialing Open Pit Mine, China

et al. 2014

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Coal fires are a serious environment, health, and safety hazard throughout the world. They damage the environment, threaten the health of people living nearby, burn away non-renewable coal, and result in significant economic losses. In this paper, the characteristics of the ignition and propagation of coal fires are illustrated first. Semienclosed environments (loose zones and abandoned roadways) favor the ignition of coal fires. The ''upper fire'' is pointed out to be prevalent and difficult to be controlled. Furthermore, the advantages and disadvantages of several commonly used techniques for controlling coal fires are analyzed. The three-phase foam and water mist techniques are believed to be effective in controlling coal fires, especially the ''upper fires'' in loose zones and abandoned roadways, respectively. Then, the three-phase foam coal fire extinguishing system is improved, and the water mist coal fire extinguishing system is developed. Finally, these two techniques are applied to control coal fires in the Anjialing Open Pit Mine. The results show that the three-phase foam and water mist techniques control coal fires efficiently and ensure the safe production of the mine as well as the security of personnel and equipments. Most importantly, this study provides a valuable method for the control of other coal fires.

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Section: Ignition and Propagation Of Coal Firesmentioning

confidence: 99%

Controlling coal fires using the three-phase foam and water mist techniques in the Anjialing Open Pit Mine, China

et al. 2014

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“…Following the work of Fierro et al [4], we assume that the air flow directions are as shown in Figure 1. Fierro et al applied such flows to coal piles.…”

Section: Governing Equationsmentioning

confidence: 99%

Determining critical conditions for two dimensional compost piles with air flow via numerical simulations

Luangwilai¹,

Sidhu²

2011

ANZIAMJ

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We consider the self-heating process of a two dimensional, spatially dependent, model of a compost pile which incorporates terms that account for self-heating due to both biological and oxidative mechanisms. This self-heating model consists of mass balance equations for oxygen and energy. We study the effects of air flow through the pile. Numerical solutions determine critical conditions for thermal ignition within the compost pile. Two distinct numerical approaches corroborate solutions to the self-heating problem in compost piles. We analyse the model numerically using FlexPDE (a commercial software package) in a two dimensional configuration. The results obtained are then compared with those obtained using the Method of Lines. We focus mainly on the critical conditions for thermal ignition for different rates of air flow moving through the compost pile.

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“…Para ambos métodos, los autores encontraron que las tendencias de la temperatura crítica, principalmente se pueden explicar en términos de los efectos del contenido de humedad de las muestras, a menos contenido de humedad, se reduce su propensión a la combustión espontánea. Fierro et al [16] estudiaron la combustión espontánea de cinco pilas de carbón de prueba y la medida para evitar la pérdida del calor producido, desarrollaron un método directo para determinar el coeficiente de pérdidas totales y determinar los coeficientes de pérdidas de calor. Para evitar la combustión espontánea, las reservas se estaban protegiendo para evitar al máximo el flujo de aire con una barrera artificial o eran cubiertas con una suspensión de cenizas húmedas de la misma planta de energía.…”

Section: Introductionunclassified

Glycerol effect on the inhibition of spontaneous combustion of subbituminous coal

Acevedo

Valencia²,

Cortés

2016

Bol. Cienc. Tierra

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Factors favoring the phenomenon of spontaneous combustion in coal mainly depend on the intrinsic properties such as coal particle size, moisture content, among others; the medium in which it is located and how it is stored. Consistent with this, the objective of this work is to evaluate the effect of glycerol on the inhibition of self-combustion as water re-adsorption reducer through the addition of glycerol in different amounts (4, 8, 18 and 28% wt). The coal sample was extracted from the Córdoba department, Colombia. Incipient impregnation method was used to perform the addition of glycerol to the desired quantities. Characterizing the coal samples was performed by: TGA-DTG, nitrogen adsorption at -196 °C, C-H-N-O, FTIR, and SEM. The TGA of the coals evaluated in an air atmosphere, show changes in combustion properties of each sample. D i ignition index is reduced as the coal is impregnated with glycerol, obtaining its lowest value for 8wt% of glycerol. The effect of glycerol in inhibiting the spontaneous combustion of coal is exposed in the adsorption equilibrium; the sample with 8wt% glycerol shows the highest reduction of water adsorption in coal validating the proposed technology as inhibitor agent spontaneous combustion phenomenon found in Colombian coal.Keywords: Adsorption; Coal; Isotherm; Water Efecto del glicerol en la inhibición de la combustión espontánea de carbón sub-bituminoso ResumenFactores que favorecen el fenómeno de auto-combustión del carbón depende principalmente de las propiedades intrínsecas, tales como tamaño de partícula, contenido de humedad, entre otros; el medio en el que se encuentra y cómo se almacena. De acuerdo con esto, el objetivo de este trabajo es evaluar el efecto del glicerol en la inhibición de auto-combustión del carbón como reductor de re-adsorción de agua, mediante la adición de glicerol en diferentes cantidades (4, 8, 18 y 28% en peso). El método de impregnación incipiente se utilizó para adicionar el glicerol a las cantidades deseadas. La caracterización de las muestras se realizó mediante: TGA-DTG, adsorción de nitrógeno a -196 ° C, C-H-N-O, FTIR, y SEM. El TGA de los carbone refleja cambios en las propiedades de combustión de cada muestra. El índice de ignición D i presenta su valor más bajo para la muestra con 8% en peso. El efecto del glicerol en la inhibición de la combustión espontánea del carbón está expuesto en el equilibrio de adsorción; la muestra con 8% en peso de glicerol presenta la mayor reducción de la adsorción de agua en el carbón validando la tecnología propuesta como agente inhibidor del fenómeno de auto-combustión en carbones colombianos.

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Model predictions and experimental results on self-heating prevention of stockpiled coals

Cited by 76 publications

References 16 publications

Controlling coal fires using the three-phase foam and water mist techniques in the Anjialing Open Pit Mine, China

Controlling coal fires using the three-phase foam and water mist techniques in the Anjialing Open Pit Mine, China

Determining critical conditions for two dimensional compost piles with air flow via numerical simulations

Glycerol effect on the inhibition of spontaneous combustion of subbituminous coal

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