scholarly journals TGA/DSC study to characterise and classify coal seams conforming to susceptibility towards spontaneous combustion

2021 ◽  
Author(s):  
Niroj Kumar Mohalik ◽  
Somu Mandal ◽  
Santosh Kumar Ray ◽  
Asfar Mobin Khan ◽  
Debashish Mishra ◽  
...  
Keyword(s):  
Spontaneous Combustion ◽  
Coal Seams

scholarly journals Peculiarities of using classification indicators of the coal metamorphism degree for predicting the hazardous coal seams properties

2020 ◽  
Vol 201 ◽  
pp. 01014
Author(s):  
Mykola Antoshchenko ◽  
Elvira Filatieva ◽  
Vladyslav Yefimtsev ◽  
Vadym Tarasov
Keyword(s):  
Spontaneous Combustion ◽  
Chemical Activity ◽  
Mining Engineering ◽  
Coal Seams ◽  
Mining Operations ◽  
Emergency Situations ◽  
Specific Composition ◽  
Geological Conditions ◽  
Definition Of ◽  
Mining Coal

Currently, there is no reliable regulatory framework for determining the hazardous properties of coal seams, including the propensity of coal for spontaneous combustion. Under relatively identical mining engineering and geological conditions for mining coal seams, the probability of emergency situations is determined to a large extent by the genetic properties of coal. The research methodology is based on the classical definition of metamorphism, which characterizes the change in the composition and properties of coal. The analysis involves indicators that directly or indirectly characterize the elemental composition of organic and mineral mass, chemical activity and physico-mechanical properties. This will allow to establish a specific composition and properties that contribute to the manifestation of certain hazardous properties of coal seams during mining operations. It is shown that the modern industrial classification does not take into account the change in the organic and mineral constituents of coal, which does not make it possible to use it unchanged to predict the hazardous properties of coal seams.

scholarly journals Prospects for the use of modern technological solutions in the flat-lying coal seams development, taking into account the danger of the formation of the places of its spontaneous combustion

2021 ◽  
Vol 250 ◽  
pp. 534-541
Author(s):  
Vladimir Zubov ◽  
Dmitrii Golubev
Keyword(s):  
Spontaneous Combustion ◽  
Underground Mining ◽  
Fire Hazard ◽  
Coal Dust ◽  
Economic Losses ◽  
Coal Seams ◽  
Emergency Situations ◽  
Wide Range ◽  
Spontaneous Combustion Of Coal ◽  
The Impact

Spontaneous combustion of coal remains an important problem for coal mines, which can lead to an explosion of methane and coal dust. Accidents associated with spontaneous combustion of coal can cause significant economic losses to coal mining companies, as well as entail social damage – injuries and loss of life. Accidents are known at the Kuzbass mines, which occurred as a result of negligent attitude to the danger of spontaneous combustion of coal, the victims of which were dozens of people. The analysis of emergency situations associated with spontaneous combustion of coal shows that the existing wide range of means of preventing endogenous fires does not provide complete safety when working out coal seams prone to spontaneous combustion, therefore, spontaneous combustion places continue to occur in mines. The consequences that may arise as a result of a methane explosion initiated by a self-ignition place indicate the need to improve the used technologies. The purpose of the work is to determine the impact of modern technological solutions used in functioning mines during underground mining of flat-lying coal seams prone to spontaneous combustion, and to develop new solutions that reduce endogenous fire hazard. Conclusions on the influence of leaving coal pillars in the developed space, isolated air removal from the stoping face through the developed space, the length of the stoping face and the excavation pillar, and other factors on the danger of the formation of spontaneous combustion places are presented. Conclusions about the possibility of using modern technological solutions in future are also drawn.

scholarly journals Statistical analysis to establish an ignition scenario based on extrinsic and intrinsic variables of coal seams that affect spontaneous combustion

2019 ◽  
Vol 29 (5) ◽  
pp. 731-737 ◽  
Author(s):  
M.O. Bustamante Rúa ◽  
A.J. Daza Aragón ◽  
P. Bustamante Baena ◽  
J.D. Osorio Botero
Keyword(s):  
Statistical Analysis ◽  
Spontaneous Combustion ◽  
Coal Seams

scholarly journals Research on a Gas Index Reflecting the Sorption Process on Carbon Materials in Coal Mines

2018 ◽  
Vol 10 (7) ◽  
pp. 2468 ◽  
Author(s):  
Karolina Wojtacha-Rychter ◽  
Adam Smoliński
Keyword(s):  
Carbon Materials ◽  
Spontaneous Combustion ◽  
Coal Mines ◽  
Sorption Process ◽  
Quantitative Relation ◽  
Gas Mixture ◽  
Coal Seams ◽  
Mine Fire ◽  
Sorption Column ◽  
Spontaneous Combustion Of Coal

Based on the concentration of gases such as propylene and ethylene in the atmosphere of a mine, it is possible to assess the development of a mine fire. With the increase of coal temperature, an increased emission of these gases has been observed. However, the experiment results presented in this paper prove that the use of propylene and ethylene for the prediction of the spontaneous combustion of coal have some limitations. It was found that during a flow of gas mixture through the sorption column, propylene and ethylene were sorbed on coal. This phenomenon manifests in smaller amounts of gases at the outlet of the sorption column. By comparing the concentration of ethylene to propylene at the inlet of the column, it was concluded that the ratio was usually below 3, whereas the range of the ratio at the end of the column was between 0.6–353. The value of gases ratio changed depending on the type of coal material in the column. The results of this experiment provide useful information that the quantitative relation between ethylene and propylene concentrations may indicate the occurrence of the sorption process on carbon materials in coal seams.

scholarly journals Determination of the Parameters of Technological Schemes for the Development of Coal Seams Prone to Spontaneous Combustion using Computer Simulation

2019 ◽  
Vol 105 ◽  
pp. 01016
Author(s):  
Sergey Meshkov
Keyword(s):  
Computer Simulation ◽  
Spontaneous Combustion ◽  
Longwall Mining ◽  
Underground Mining ◽  
Fire Hazard ◽  
Modern Technology ◽  
Coal Seams ◽  
Mining Operations ◽  
Gas Dynamic ◽  
Mining Coal

The study considers thr problem of endogenous fire hazard in underground mining of coal seams prone to spontaneous combustion. The main trends in the development of modern technology of underground coal mining are shown. The interaction of air-gas-dynamic and geomechanical processes in the development of coal seams by longwall mining is considered. The possibilities of computer simulation of air-gas-dynamic processes in the extraction districts of modern coal mines are considered. The significant influence of geological and mining conditions of mining operations on the distribution of air flow in extraction districts and the efficiency of gas emission control in the workings of the extraction districts are shown. The design scheme and the results of numerical studies (methane and oxygen concentration fields) are given. It is concluded that it is necessary to determine the rational parameters of the preparation, ventilation, isolated drainage and degassing schemes when developing gas-bearing coal seams that are prone to spontaneous combustion. Recommendations are given on improvement of the safety in mining coal seams that are prone to spontaneous combustion.

A fully coupled hydro-thermo-mechanical model for the spontaneous combustion of underground coal seams

Fuel ◽  
2014 ◽  
Vol 125 ◽  
pp. 106-115 ◽  
Author(s):  
Tongqiang Xia ◽  
Fubao Zhou ◽  
Jishan Liu ◽  
Jianhong Kang ◽  
Feng Gao
Keyword(s):  
Mechanical Model ◽  
Spontaneous Combustion ◽  
Coal Seams ◽  
Fully Coupled

scholarly journals The evolution of thick coal seams mining methods in China

2020 ◽  
Vol 192 ◽  
pp. 01023
Author(s):  
Qiao Jianyong ◽  
Wang Zhiqiang ◽  
Zhao Jingli
Keyword(s):  
Coal Mining ◽  
Spontaneous Combustion ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Recovery Coefficient ◽  
Increased Risk ◽  
Geological Conditions ◽  
Mechanized Method ◽  
Full Capacity ◽  
The Moment

The article is shown that the main methods used in China for coal mining from thick seams at the moment are two methods the Complex mechanized method of developing seams at their full capacity (used only in simple geological conditions and is an additional method for the following) and Complex mechanized mining method with coal production (which is used mainly, including in difficult conditions). Despite the fact that these methods have positively proven themselves over the years, their use has a number of significant drawbacks, including a low extraction rate, an increased risk of endogenous combustion and rock burst, and others. Currently, a promising way is a development method with a diagonal (cross-shaped) arrangement of drifts, which helps to eliminate many of the shortcomings of previous methods, including a low recovery coefficient, the risk of spontaneous combustion, the need to support the drift and others. It is expected that this method will be widely used for underground coal mining in deep mines in China with difficult mining and geological conditions.

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