Influence of Moisture on the Spontaneous Heating of Coal

Davis, J. D.; Byne, John F.

doi:10.1021/ie50195a003

Cited by 4 publications

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“…On the basis of lab research it was concluded that the most favourable conditions for spontaneous heating of broken coal occur during air flow of 1.9 m 3 /h per 1 m 3 of coal [4]. According to [5] most fires start in places where air velocity is lower than 0.5 m/s.…”

Section: Correct Usage Of Detailed Analysis Of Ventilation Con-mentioning

confidence: 99%

Possibilities of Effective Inertisation of Self-Heating Places in Goaf of Longwall in Hard Coal Mines

Szlązak

Piergies

2016

Management Systems in Production Engineering

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Underground fires in coal mines belong to the most common hazards, the exposure to which frequently requires long term and costly rescue operations. It is mainly connected with the specific character of underground excavations which have limited volume. This makes the maximum permissible concentration of harmful gases rapidly exceeded and may also cause changes in air flow direction. The most certain way of improving a safety situation in Polish coal mining industry is taking early prevention steps. One of the prevention methods is inertisation of the atmosphere in longwall goaf. These activities rely on partial or total replacement of air or combustible atmosphere by inert gas. Thanks to them the risk of spontaneous fires hazard and gas explosion decreases. The main reason for the use of inert gases is to reduce the oxygen content to a limit which prevents further development of fire. This article presents methods for assessing inert gas to replace oxygen in the atmosphere in goaf.

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Section: Correct Usage Of Detailed Analysis Of Ventilation Con-mentioning

confidence: 99%

Possibilities of Effective Inertisation of Self-Heating Places in Goaf of Longwall in Hard Coal Mines

Szlązak

Piergies

2016

Management Systems in Production Engineering

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“…Pressure and temperature were also reported to be changing the sorption capacities of coals and coal-derived materials (Howaniec 2016a, b). Fragmented coal and the inflow of approximately 2 m 3 /h into 1 m 3 of coal create the most favorable conditions for self-ignition (Davis and Bryne 1926). Mining practice has shown that it is necessary to carry on a systematic monitoring of air content as well as to determine the increase in the content of carbon monoxide, carbon dioxide, hydrocarbons, hydrogen and the decrease of oxygen content.…”

Section: Introductionmentioning

confidence: 99%

Effect of flow rates of gases flowing through a coal bed during coal heating and cooling on concentrations of gases emitted and fire hazard assessment

Więckowski

Howaniec

Smoliński

2019

Int J Coal Sci Technol

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The flow velocity of gases in gobs directly influences the kinetics and intensity of gaseous components release during heating and cooling of coal. The assessment of fire hazard is performed on the basis of concentrations of particular gases in a mine air. These concentrations differ in coal heating and cooling phase which was proven in the study. This paper presented the results of the experimental study on temperature distribution in a simulated coal bed in heating (50-250°C) and cooling (250-35°C) phases as well as its correlation to variations in concentration of gases released in these phases and flow rates of gases flowing through the coal bed. The research was performed on twenty-two samples of bituminous coals acquired from various coal beds of Polish coal mines. Considerable differences were observed between heating and cooling phases in terms of the concentrations of gases taken into account in calculations of self-combustion index. In the heating phase temperature increase resulted in the decrease of concentrations ratios of ethane, ethylene, propane, propylene and acetylene, while in the cooling phase these ratios increased systemically. The effect of air (in heating phase) and nitrogen (in cooling phase) flow rate on the self-ignition index CO/CO 2 was also determined.

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“…The first advances in self–heating investigations related to air relative humidity were attributed to Davis, who studied the effect of moisture content on the spontaneous combustion of coal using an adiabatic calorimeter. He compared the heat produced by coal in contact with dry and saturated oxygen and showed that the spontaneous combustion started at 70 °C [ 5 ]. In the 1960s, Stott confirmed these results and proposed differential equations describing the high-temperature oxidation of coal [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Statistical Modelling of Temperature and Moisture Uptake of Biochars Exposed to Selected Relative Humidity of Air

et al. 2018

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New experimental techniques, as well as modern variants on known methods, have recently been employed to investigate the fundamental reactions underlying the oxidation of biochar. The purpose of this paper was to experimentally and statistically study how the relative humidity of air, mass, and particle size of four biochars influenced the adsorption of water and the increase in temperature. A random factorial design was employed using the intuitive statistical software Xlstat. A simple linear regression model and an analysis of variance with a pairwise comparison were performed. The experimental study was carried out on the wood of Quercus pubescens, Cyclobalanopsis glauca, Trigonostemon huangmosun, and Bambusa vulgaris, and involved five relative humidity conditions (22, 43, 75, 84, and 90%), two mass samples (0.1 and 1 g), and two particle sizes (powder and piece). Two response variables including water adsorption and temperature increase were analyzed and discussed. The temperature did not increase linearly with the adsorption of water. Temperature was modeled by nine explanatory variables, while water adsorption was modeled by eight. Five variables, including factors and their interactions, were found to be common to the two models. Sample mass and relative humidity influenced the two qualitative variables, while particle size and biochar type only influenced the temperature.

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Influence of Moisture on the Spontaneous Heating of Coal

Cited by 4 publications

References 0 publications

Possibilities of Effective Inertisation of Self-Heating Places in Goaf of Longwall in Hard Coal Mines

Possibilities of Effective Inertisation of Self-Heating Places in Goaf of Longwall in Hard Coal Mines

Effect of flow rates of gases flowing through a coal bed during coal heating and cooling on concentrations of gases emitted and fire hazard assessment

Statistical Modelling of Temperature and Moisture Uptake of Biochars Exposed to Selected Relative Humidity of Air

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