Reaction kinetics of coal oxidation at low temperatures

Arısoy, Ahmet; Beamish, B. B.

doi:10.1016/j.fuel.2015.06.054

Cited by 104 publications

(31 citation statements)

References 15 publications

(22 reference statements)

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“…It is assumed that oxygen can penetrate throughout the coal without diffusional limitation and the reaction mechanism between gas and solid phases is deemed as a homogenous gas phase reaction [11]. The value of the reaction order in low temperature oxidation of coal and other carbonaceous materials has been indicated to vary from 0.5 to 1 [12,47].…”

Section: Low-temperature Coal Oxidation Kineticsmentioning

confidence: 99%

“…The accumulated heat will result in a slow rising of temperature at the initial stage of coal oxidation. Once the temperature reaches a critical value which was widely reported to be 60~120 o C, thermal runaway would occur and the self-heating rate of coal is very likely to take off in a relatively short period of time [5][6][7][8][9][10][11]. Therefore low-temperature coal oxidation is a very critical stage with concern of preventing coal spontaneous combustion.…”

Section: Introductionmentioning

confidence: 99%

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Transient CFD modelling of low-temperature spontaneous heating behaviour in multiple coal stockpiles with wind forced convection

Zhang

Liang

Ren

et al. 2016

Fuel Processing Technology

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G. (2016). Transient CFD modelling of low-temperature spontaneous heating behaviour in multiple coal stockpiles with wind forced convection. Fuel Processing Technology, 149 55-74.Transient CFD modelling of low-temperature spontaneous heating behaviour in multiple coal stockpiles with wind forced convection AbstractSpontaneous heating of coal stockpile has long been a thermal dynamic hazard during coal storage, processing, and transport. A transient non-equilibrium thermal CFD model has been developed to study the low-temperature self-heating behaviour of coal in multiple stockpiles under different prevailing wind conditions. Modelling results from the initial steady wind flow simulation indicate that a wake region can be induced on the leeward side of each coal stockpile. Pressure coefficient drops when the wind stream encounters or leaves a stockpile and the pressure coefficient profiles of multiple stockpiles tend to have more resemblance with a wider spacing. The first stockpile acts like a wind barrier to the adjacent stockpiles and the maximum temperature of it tends to be the first approaching the critical temperature. A 'hot spot' will develop and then migrate towards deep regions in each of these stockpiles that are loosely compacted under higher wind velocity conditions. Wind velocity and porosity of stockpile have significant influences on self-heating behaviour of the stockpiles and transport pattern of gaseous products liberated by coal oxidation. Compacting stockpiles from loosely packed scenario to slightly packed scenario might not be able to slow down the temperature rising rate at low-temperature range but could considerably minimize the volume of deteriorated coal. The highest temperature rising profiles of the stockpiles located in downwind side can approach to that of the first stockpile, particularly when they are more widely stacked. Stacking coal stockpiles as close as practically possible is recommended to maximise the "protection" of adjacent stockpiles but would cause undesirable accumulation of carbonic gases. Stockpiles in low height and gentle slope will have a prolonged safe storage period, especially for the first stockpile directly facing the wind direction. However, it may not slow down the self-oxidation process of the adjacent stockpile at very initial stage due to "weakened protection" of the first stockpile. This study has practical reference to coal industry especially where multiple coal stockpiles require to be constructed. 13The first stockpile acts like a wind barrier to the adjacent stockpiles and the maximum temperature of it tends to 14 be the first approaching the critical temperature. A 'hot spot' will develop and then migrate towards deep 15 regions in each of these stockpiles that are loosely compacted under higher wind velocity conditions. Wind 23Stockpiles in low height and gentle slope will have a prolonged safe storage period, especially for the first 24 stockpile directly facing the wind direction. However, it may not slow down the self-oxidation process o...

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Section: Low-temperature Coal Oxidation Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient CFD modelling of low-temperature spontaneous heating behaviour in multiple coal stockpiles with wind forced convection

Zhang

Liang

Ren

et al. 2016

Fuel Processing Technology

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“…In Figure 6(a), the oxygen concentration is the highest at the working face (X=400m), and the oxygen concentration is the lowest at X=0m (the deepest part of the gob). Since the coal in the gob will adsorb oxygen and react gradually with it, the physical and chemical adsorption of coal samples occur first after contacting, then the chemical reaction of coal oxygen occurs with the increase of temperature [21], and the oxygen concentration gradually decreases as the burial depth increases.…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

Oxygen Distribution and Air Leakage Law in Gob of Working Face of U+L Ventilation System

Zhai

Wang

Jiang

et al. 2019

Mathematical Problems in Engineering

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In order to prevent and control coal spontaneous combustion effectively in the gob of U+L working face, the 30105 working face of Hanglaiwan mine was taken as the research object. The relationship models between oxygen concentration and burial depth of the two tunnels in the gob of U+L working face were established. The distribution of oxygen in the gob of the working face of U+L ventilation system was studied by field observation combined with numerical simulation. The results show that the air leakage in the gob is serious. There are a number of fluctuation areas where the oxygen concentration first decreases and then increases in the air intake side of the gob. The oxygen concentration peaked at 100m, 175m, and 245m, respectively, from the intake side of the gob. In the same position of the gob depth, the air leakage intensity on the intake side is generally higher than that on the return side, and the oxygen concentration on the intake side of the gob is slower than the return side. Oxygen concentration maintains at 5.09% when the depth of gob reaches 400m. Measures to prevent coal spontaneous combustion should be strengthened in the air intake side.

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“…Many scholars have chosen experimental methods to analyze the oxygen consumption, products, and thermal effects at different stages of coal spontaneous combustion. [20][21][22][23][24][25][26] These analyses have provided the necessary theoretical support for further understanding of the coal spontaneous combustion mechanism. However, simply performing physical experiments has inevitably caused some important influencing factors to be ignored.…”

Section: Introductionmentioning

confidence: 93%

Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling

Huang

Wang

Dai

et al. 2020

Energy Science & Engineering

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The spontaneous combustion of coal is one of the major hazards in the mining, storage, and transportation of coal. There are numerous examples of spontaneous coal fires in major coal-producing countries such as the United States, China, Australia, India, and South Africa. 1-4 The safety hazards, resource losses, and environmental issues caused by this persistent problem have attracted widespread attention. 3,5

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Reaction kinetics of coal oxidation at low temperatures

Cited by 104 publications

References 15 publications

Transient CFD modelling of low-temperature spontaneous heating behaviour in multiple coal stockpiles with wind forced convection

Transient CFD modelling of low-temperature spontaneous heating behaviour in multiple coal stockpiles with wind forced convection

Oxygen Distribution and Air Leakage Law in Gob of Working Face of U+L Ventilation System

Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling

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