Effects of 1-butyl-3-methylimidazolium tetrafluoroborate and the oxygen concentration on the spontaneous combustion of coal

2019 ◽  
Vol 138 (5) ◽  
pp. 3445-3454 ◽  
Author(s):  
Yang Xiao ◽  
Da-Jiang Li ◽  
Hui-Fei Lü ◽  
Lan Yin ◽  
Chi-Min Shu
Keyword(s):  
Oxygen Concentration ◽  
Spontaneous Combustion ◽  
Spontaneous Combustion Of Coal

scholarly journals Numerical Simulation of Coal Spontaneous Combustion around a Borehole Induced by Negative Pressure Gas Drainage

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Youxin Zhao ◽  
Qingjie Qi ◽  
Xinlei Jia ◽  
Yingjie Liu ◽  
Jingwen Zhang
Keyword(s):  
Oxygen Concentration ◽  
Negative Pressure ◽  
Spontaneous Combustion ◽  
Combustion Process ◽  
Extraction Process ◽  
Gas Extraction ◽  
Growth Trend ◽  
Gas Drainage ◽  
Gas Seepage ◽  
Spontaneous Combustion Of Coal

The suction negative pressure is an important factor affecting the spontaneous combustion of coal around a borehole. Because the mechanism of suction negative pressure in the gas extraction process remains unclear, a constant suction negative pressure is often used in coal mines, leading to a low efficiency of gas extraction in deep coal seams. Moreover, the coal body easily undergoes spontaneous combustion during the extraction process, which is not conducive to safe mining. To study the effect of the suction negative pressure near the end sealing section, a numerical model of the combustion process around a borehole under the influence of suction negative pressure was established using COMSOL. The variation laws of the gas seepage velocity, oxygen concentration, and coal temperature in the borehole cycle were analyzed, and the gas suction negative pressure under different sealing parameters was optimized to ensure efficient gas extraction and prevent the spontaneous combustion of coal. The results showed that the negative pressure of extraction provides the power required for gas seepage into the borehole, and the gas flow rate increases with increasing negative pressure of extraction, exhibiting a linear growth trend. The range of the coal suffocation zone around the sealing section decreases with the increase in the negative pressure. With the extension of the gas extraction time, the oxygen concentration decreases rapidly, and the inflection point advances with the increase in the negative pressure. When the negative pressure of gas extraction is <40 kPa, the range of the high-temperature area around the block increases with the negative pressure of gas extraction. Based on the present situation of the spontaneous combustion induced by gas drainage in the Pingdingshan No. 10 Coal Mine, different sealing parameters should be set with different negative pressures of extraction, and the negative pressure of extraction should not exceed −18 kPa when the sealing depth is 20 m and the sealing length is 8 m in the 24130 working face. These parameter settings can help effectively prevent spontaneous combustion during the extraction process.

Study on the preparation and inhibition mechanism of intumescent nanogel for preventing the spontaneous combustion of coal

Fuel ◽  
2022 ◽  
Vol 310 ◽  
pp. 122240
Author(s):  
Zhian Huang ◽  
Sainan Quan ◽  
Xiangming Hu ◽  
Yinghua Zhang ◽  
Yukun Gao ◽  
...  
Keyword(s):  
Spontaneous Combustion ◽  
Inhibition Mechanism ◽  
Spontaneous Combustion Of Coal

Multifaceted processes controlling the distribution of hazardous compounds in the spontaneous combustion of coal and the effect of these compounds on human health

2018 ◽  
Vol 160 ◽  
pp. 562-567 ◽  
Author(s):  
Marcos L.S. Oliveira ◽  
Kátia da Boit ◽  
Fernanda Pacheco ◽  
Elba C. Teixeira ◽  
Ismael L. Schneider ◽  
...  
Keyword(s):  
Human Health ◽  
Spontaneous Combustion ◽  
Spontaneous Combustion Of Coal ◽  
Hazardous Compounds

scholarly journals Experimental study on adsorbing of flue gas and its application in preventing spontaneous combustion of coal

2018 ◽  
Vol 36 (9-10) ◽  
pp. 1744-1754 ◽  
Author(s):  
Fei Gao ◽  
Cun-Bao Deng ◽  
Xue-Feng Wang ◽  
Xue-Ming Li ◽  
Feng-Wei Dai
Keyword(s):  
Power Plant ◽  
Adsorption Capacity ◽  
Flue Gas ◽  
Spontaneous Combustion ◽  
Factors Affecting ◽  
Generation Cost ◽  
Spontaneous Combustion Of Coal ◽  
Temperature And Pressure ◽  
Main Components ◽  
Emission Of Greenhouse Gases

We propose an experimental adsorption device, imitating the environment of a coal-mine goaf and the composition of the flue gas in Tashan Mine Power Plant. The characteristics of the coal adsorbing flue gas were studied with the atmospheric volumetric method. The factors affecting the seal of CO2 were analyzed and the effect of power plant flue gas on fire prevention in the goaf was investigated at normal temperature and pressure. It can be inferred from the experiment that N2, SO2, and H2O can also reduce CO2 adsorption capacity. The increase or decrease in pH can increase the adsorption capacity of CO2, which is apparently larger when the pH is decreasing than when the pH is increasing. The O2 adsorption capacity can evidently be reduced when the power plant flue gas is injected into the goaf. The activation energy of coal burned in air is greater than that of coal burned in flue gas, indicating that the use of power plant flue gas, with N2 and CO2 as the main components, to replace the traditional inert gas can not only save N2 generation cost, but also reduce the emission of greenhouse gases, while the power plant flue gas can be adsorbed by coal.

scholarly journals Study on the Microscopic Mechanism of Spontaneous Combustion and Oxidation Kinetics of Water-Leached Coal

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Naifu Cao ◽  
Gang Wang ◽  
Yuntao Liang
Keyword(s):  
Kinetic Model ◽  
Moisture Content ◽  
Spontaneous Combustion ◽  
Water Immersion ◽  
Combustion Process ◽  
Oxidation Kinetic ◽  
Oxidation Mechanism ◽  
Temperature Oxidation ◽  
Before And After ◽  
Spontaneous Combustion Of Coal

In this article, a series of experiments have been carried out to study the spontaneous combustion and oxidation mechanism of coal after water immersion and investigate its tendency to spontaneous combustion, analyze the difficulty of spontaneous combustion of coal samples under different water immersion conditions, and establish a kinetic model of water immersion coal oxidation (taking the Bulianta 12# coal as a case study). They rely on physical oxidation adsorption, scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetry, and oil bath heating. SEM has been used to analyze the characteristics of coal pore structure under different water immersion conditions (water-saturated coal samples under different water loss conditions until the coal samples are completely dried); FTIR served to investigate the characteristics of the molecular chemical structure of the coal surface before and after the coal is immersed in water. Through programmed temperature oxidation experiments combined with FTIR analyses and gas chromatographic (GC) analysis of gaseous products, it has been possible to study the changes of molecular structure and gas products on the surface of coal samples at different temperatures and water immersion conditions. The oxidation reaction rate of the 12# coal samples of Shendong Mine’s Bulianta Mine under different water content conditions during the spontaneous combustion process has been quantitatively studied. The difficulty of spontaneous combustion of coal samples has been correspondingly addressed. A kinetic model from the perspective of oxygen consumption has been proposed. Thermogravimetry-differential scanning calorimetry (TG-DSC) has been used to analyze and study the exothermal oxidation process before and after coal immersion. From the perspective of the exothermic intensity of the coal-oxygen reaction, an oxidation kinetic model for immersed coal samples has been developed to qualitatively determine its spontaneous combustion tendency. Results have shown that the increase in the specific surface area increases the risk of spontaneous combustion, and coal samples after soaking and drying have a stronger tendency to spontaneous combustion than raw coal. The moisture content of the coal sample leading to the easiest ignition conditions is 16.05%. Regardless of the moisture content, the critical temperature is maintained at 65–75°C, and the temperature of the left coal in the goaf should be prevented from exceeding this critical value.

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