The influence of oxygen concentration on the composition of gaseous products occurring during the self-heating of coal and wood sawdust

Perďochová, Michaela; Derychová, Kateřina; Věžníková, Hana; Bernatík, Aleš; Pitt, Martin J.

doi:10.1016/j.psep.2014.10.006

Cited by 34 publications

(10 citation statements)

References 10 publications

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“…While Tang et al [7] experimentally studied the effect of temperature on spontaneous combustion of coal and proposed the critical temperature for spontaneous combustion of different coal types. Several researchers found that gas adsorption in coal is related to the oxygen functional group by infrared spectroscopy, and the oxygen concentration affects the combustion of coal particles [8][9][10][11]. Recently, Xin et al [12,13] carried out continuous measurement on sub-bituminous coal samples under different temperatures and oxygen concentrations, and analysed the chemical relationship between oxygen consumption and oxygen effect.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on oxygen adsorption in porous media of coal rock based on fractal geometry

Liang

et al. 2020

R. Soc. open sci.

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In order to explore the factors affecting coal spontaneous combustion, the fractal characteristics of coal samples are tested, and a pore-scale model for oxygen adsorption in coal porous media is developed based on self-similar fractal model. The liquid nitrogen adsorption experiments show that the coal samples indicate evident fractal scaling laws at both low-pressure and high-pressure sections, and the fractal dimensions, respectively, represent surface morphology and pore structure of coal rock. The pore-scale model has been validated by comparing with available experimental data and numerical simulation. The present numerical results indicate that the oxygen adsorption depends on both the pore structures and temperature of coal rock. The oxygen adsorption increases with increased porosity, fractal dimension and ratio of minimum to maximum pore sizes. The edge effect can be clearly seen near the cavity/pore, where the oxygen concentration is low. The correlation between the oxygen adsorption and temperature is found to obey Langmuir adsorption theory, and a new formula for oxygen adsorption and porosity is proposed. This study may help understanding the mechanisms of oxygen adsorption and accordingly provide guidelines to lower the risk of spontaneous combustion of coal.

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Section: Introductionmentioning

confidence: 99%

A numerical study on oxygen adsorption in porous media of coal rock based on fractal geometry

Liang

et al. 2020

R. Soc. open sci.

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“…Self-ignition in general (Balog, 1999;Kalousek, 1999;Adamus et al, 2007 Self-ignition of plant materials (Balog, 1999) Effect of composition on self-ignition temperature (Ekoporadna, 2010) Effect of temperature on self-ignition temperature (Balog, 1999) Effect of grain size on self-ignition temperature (Jirjis, 1995) Effect of humidity on self-ignition temperature (Lohrer et al, 2005) Effect of volume of accumulated material on self-ignition temperature (Jirjis, 2005) Methods for determining inclination to self-ignition (Adamus, 2004;Bowes, 1984) Issue of gaseous products released during wood material self-heating (Kuang et al, 2009;Yazdanpanah et al, 2014;Kuang et al, 2008;Jäppinen et al, 2014;He et al, 2014;Oren et al, 1987) Effect of temperature on the quantity of gaseous products released during wood material self-heating (Oren et al, 1987;Perdochova, 2014) Effect of concentration of oxygen on the composition of gaseous products produced during wood sawdust selfheating (Perdochova et al, 2015) Fig. 1.…”

Section: Resolved Issues Sourcementioning

confidence: 99%

Inclination to self-ignition and analysis of gaseous products of wood chips heating

Skrizovska

Věžníková

Roupcová

2020

Acta Chimica Slovaca

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This paper focuses on the assessment of the inclination to self-ignition of various types of wood chips according to the methodology of European standard EN 15188. The study also assesses the effect of heating temperatures on the composition and quantity of gaseous products of heating. Gases were analysed using an infrared spectrometer with Fourier transformation. From the measured results it was found that the inclination to self-ignition differs for various samples of wood chips. The paper discusses certain parameters assumed to affect the inclination of biomass to self-ignite. When assessing the effect of temperature on the composition of gaseous products, a sample of forest wood chips heated at temperatures from 50 to 150 °C resulted in the following gaseous products: carbon dioxide, carbon monoxide, water and aliphatic hydrocarbons; their concentrations increase with the increasing temperature. Carbon oxides have been proposed as indicators of the state of stored materials self-heating. Observations presented in this paper can be used as data for elaborating safety instructions for storage of fuels based on solid biomass.

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“…% oxygen. 28 The value of thermokinetic parameters increased with a decrease in the oxygen concentration during low-temperature oxidation of coal. 29 The oxygen consumption rate of coal decreased with the decrease in the oxygen level.…”

Section: Introductionmentioning

confidence: 97%

Effect of Oxygen Concentration on the Oxidative Thermodynamics and Spontaneous Combustion of Pulverized Coal

Ren

Deng

et al. 2021

ACS Omega

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Spontaneous combustion of pulverized coal has become a safety topic and has been extensively researched. This study using differential scanning calorimetry investigated the exothermic characteristics and spontaneous combustion risk of three metamorphic pulverized coal samples during oxidative combustion, for oxygen concentrations of 21, 19, 17, 15, 13, 11, 9, 7, and 5 vol %. Results indicated that decreased oxygen concentrations reduced exothermic intensity and substantially increased ignition temperatures. The oxidative thermal release observed during the combustion stage was conspicuously higher than during the low-temperature oxidation stage. Thermal release during low-temperature oxidation was low during low oxygen concentrations; however, when the oxygen concentration was less than 13.0 vol.%, it had a considerable influence on exothermic combustion. When the oxygen level was lowered from 21.0 to 5.0 vol %, spontaneous combustion risk indexes lessened from 2.07 (sample A), 1.85 (sample B), and 0.81 [J/(mg min °C2 )] (sample C) to 1.08 (sample A), 1.13 (sample B), and 0.40 [J/(mg min °C2 )] (sample C), respectively. Both apparent activation energy and spontaneous combustion risk indexes of the samples decreased saliently as oxygen concentration decreased. Thus, reducing oxygen concentration would be an effective method of inhibiting or possibly even preventing the spontaneous combustion of pulverized coal.

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The influence of oxygen concentration on the composition of gaseous products occurring during the self-heating of coal and wood sawdust

Cited by 34 publications

References 10 publications

A numerical study on oxygen adsorption in porous media of coal rock based on fractal geometry

A numerical study on oxygen adsorption in porous media of coal rock based on fractal geometry

Inclination to self-ignition and analysis of gaseous products of wood chips heating

Effect of Oxygen Concentration on the Oxidative Thermodynamics and Spontaneous Combustion of Pulverized Coal

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