Analysis of spontaneous combustion liability indices and coal recording standards/basis

Gbadamosi, Abisola Risiwat; Onifade, Moshood; Genc, Bekir; Rupprecht, S.M.

doi:10.1016/j.ijmst.2020.03.016

Cited by 42 publications

(8 citation statements)

References 26 publications

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“…Proximate Analysis. Proximate analysis 30 is a basic method to determine the chemical composition of coal, and it is also an important indicator for evaluating coal quality. The 5E-MAG6700 automatic proximate analyzer is used to perform proximate analysis on two coal samples after five temperature treatments, and the volatile content of the coal samples is determined as shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Study on the Pore and Crack Change Characteristics of Bituminous Coal and Anthracite after Different Temperature Gradient Baking

Zhuang

Zhang

et al. 2021

Energy Fuels

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At present, there are few studies on the development, evolution, and quantitative analysis of internal pores and cracks after heat treatment of coal. On the basis of this, low-temperature nitrogen adsorption, scanning electron microscopy, and X-ray diffraction (XRD) experiments were carried out on five kinds of temperature-treated bituminous coal and anthracite. The pore cracks of coal samples were studied qualitatively and quantitatively using linear fitting and the fractal theory. Through the analysis of the original diffractograms in the XRD experiment, the quantitative analysis of mineral composition in coal was realized. The results show that, with the increase of the temperature, the thermal damage of coal changes obviously and the micromorphology of the coal surface changes from the initial compact structure to the appearance of pores and small cracks and then to the mutual connection and evolution into large cracks. The development of pores and cracks of bituminous coal is more obvious than that of anthracite. Because anthracite has better heat resistance, there is no expansion and crack in its internal structure during the experiment. Through the fractal calculation of the coal nitrogen adsorption capacity, it is obtained that the overall pore volume and specific surface area of bituminous coal and anthracite are positively correlated with the fractal dimension (D 1) of the pore structure and V daf is negatively correlated with the fractal dimension (D 2) of the pore surface. In the temperature range from a normal temperature to 100 °C, the mineral crystal structure inside the coal body changes significantly, a large number of pores appear on the coal surface, and the total pore volume increases accordingly to reach the measured maximum value. The research of this paper is of great significance to reveal the effect of the temperature on coal damage and deformation and crack evolution.

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Section: Methodsmentioning

confidence: 99%

Study on the Pore and Crack Change Characteristics of Bituminous Coal and Anthracite after Different Temperature Gradient Baking

Zhuang

Zhang

et al. 2021

Energy Fuels

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“…For example, considering the moisture of the analytical sample W a , it is impossible to judge the formation moisture (W) of the mine formation [10]. To reliably determine the propensity of coal mines to spontaneous combustion, it is necessary to take into account the existing differences between the laboratory determination of indicators and the conditions for finding coal in production conditions [2].…”

Section: For Stage I the Valuementioning

confidence: 99%

“…This factor determines the tendency of coal to ignite spontaneously. It is due to its ability to enter into chemical interaction with oxygen [2]. Statistical multivariate analysis showed that the degree of metamorphism is the most significant characteristic of the propensity of coal to oxidation [1], [3].…”

Section: Introductionmentioning

confidence: 99%

Metamorphism Indicators for Establishing the Endogenic Fire Hazard of Coal Mining Plants in Mining

Tarasov¹,

Antoshchenko²,

Rudniev³

et al. 2021

IJESD

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In coal mining, the problem of particular importance is the occurrence of endogenous fires and explosions of the methane-air mixture, which lead to the death of people. The aim of the study is to establish indicators that directly characterize the change in the elemental composition in the process of metamorphic transformations of coals and determine them tendency to spontaneous combustion. Statistical multivariate analysis showed that the degree of metamorphism is the most significant characteristic of the propensity of coal to oxidize. The sum of the content of the main components decreases inversely to the increase in carbon content over the entire range of coal conversion from a small degree of their metamorphism from coal to anthracites. The dependence of decrease in oxygen content with increased carbon is nonlinear. With carbon content of more than 88%, there is a slight decrease in the rate of oxygen reduction in comparison to its decrease at earlier stages of metamorphism. A significant correlation of carbon with oxygen and hydrogen is observed. A characteristic feature of coals containing up to 75% carbon is a wide range of changes in formation moisture and oxygen content in organic matter. It indicates minor transformations of coals at the early stages of metamorphism. One of the signs of an increase in the influence of metamorphic processes is a one-sided increase in the carbon content in organic matter and a functional decrease in the sum of the remaining components - hydrogen, nitrogen, sulfur and oxygen.

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“…The fire accident caused by coal spontaneous combustion (CSC) is one of the most serious coal mine accidents. [3][4][5] The occurrence of CSC is a complex physical and chemical reaction process, [6][7][8][9] resulting from multiple factors, among which the properties of coal (including coalification degree, water content, particle size, and porosity) [10][11][12] are key influencing factors. At present, as coal mining gradually develops toward the deep, the properties of coal undergo greater variations, [13][14][15] and thermal damage is one of the most important variations.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal damage on pore development and oxidation reaction of coal

Shao

Yang

2022

Asia-Pacific J Chem Eng

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With the coal entering deep mining, the thermal damage to the destruction of the coal body structure, causing the phenomenon of coal spontaneous combustion is more and more common. To better understand the effect of thermal damage on coal spontaneous combustion, the law of thermal damage on pore structure and free radical of coal was studied by automatic specific surface area analyzer and electron spin resonance spectrometer. It was concluded that 225 C was a key point of thermal damage on coal spontaneous combustion.

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Analysis of spontaneous combustion liability indices and coal recording standards/basis

Cited by 42 publications

References 26 publications

Study on the Pore and Crack Change Characteristics of Bituminous Coal and Anthracite after Different Temperature Gradient Baking

Study on the Pore and Crack Change Characteristics of Bituminous Coal and Anthracite after Different Temperature Gradient Baking

Metamorphism Indicators for Establishing the Endogenic Fire Hazard of Coal Mining Plants in Mining

Effect of thermal damage on pore development and oxidation reaction of coal

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