The Comprehensive Fire-Fighting Technology Research of the Section Retracement in Fully Mechanized Workface

2013 ◽  
Vol 709 ◽  
pp. 305-308
Author(s):  
Qun Niu ◽  
Lin Chao Dai ◽  
Fu Dao Liu ◽  
Yu Qiang Guo
Keyword(s):  
Spontaneous Combustion ◽  
Slip Casting ◽  
Mining Industry ◽  
Comprehensive Treatment ◽  
Technology Research ◽  
Coal Spontaneous Combustion ◽  
Nitrogen Injection ◽  
Safe Production ◽  
Spontaneous Combustion Of Coal ◽  
Forecast Technique

Spontaneous combustion of coal is one of the most serious coal mine disasters, which threat the workers' life safety. The paper introduce the comprehensive measures, such as monitor, positive draft technology, nitrogen injection, slip casting, fire preventing and extinguishing under seal, and other relevant coal spontaneous combustion forecast technique used in 1901s fully mechanized workface of FuCheng mining industry, when it has not been mined or its work face has not been removed, which realize the comprehensive treatment of coal spontaneous combustion, guarantee the safe production, and serves as a certain guidance and reference to the efficiency mining of spontaneous combustion coal seam.

scholarly journals Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1969 ◽  
Author(s):  
Yuguo Wu ◽  
Yulong Zhang ◽  
Jie Wang ◽  
Xiaoyu Zhang ◽  
Junfeng Wang ◽  
...  
Keyword(s):  
Technological Process ◽  
Optimization Design ◽  
Spontaneous Combustion ◽  
Combustion Process ◽  
Mining Industry ◽  
Delayed Effect ◽  
Coal Spontaneous Combustion ◽  
Temperature Programmed Oxidation ◽  
Oxidation Stage ◽  
Spontaneous Combustion Of Coal

It is imperative to have an in-depth understanding of the effect of extraneous moisture on the spontaneous combustion of coal not only for the control and prevention of coal spontaneous combustion in the coal mining industry, but also for the optimization design and application of the technological process. In this study, the type of moisture in a coal body has been redefined for the first time from the perspective of disaster prevention and control, i.e., original occurrence of moisture in the coal matrix and the extraneous moisture from the technological process. A suit of coal bodies with different extraneous moisture was prepared by soaking long-flame coal with a low water content. Using a temperature-programmed oxidation test, the effects of extraneous moisture on the temperature increase rate of coal bodies and the emission characteristics of gaseous products during coal spontaneous combustion were studied. Moreover, combined with the characterization of thermal analysis and of pore structure test, the action the mechanism of extraneous moisture on the coal spontaneous combustion process was also explored. The experimental results indicated that the effect of the extraneous moisture content varied with the development of coal spontaneous combustion. In the slow oxidation stage, extraneous moisture played a physical inhibition role in the coal oxidation. In the accelerated oxidation stage, extraneous moisture exhibited a catalytic effect on the coal–oxygen reaction or directly participated in the reaction. After entering the rapid oxidation stage, a delayed effect appeared. When the coal temperature exceeded 180 °C, the spontaneous combustion characteristics of coals with different initial moisture contents gradually tended to achieved balance.

Electrical and Mechanical Technology Research of Fully Mechanized Coal Caving under Aquifer

2011 ◽  
Vol 396-398 ◽  
pp. 198-204
Author(s):  
Gui Ling Bu ◽  
Li Wang ◽  
Bai Chao Song
Keyword(s):  
Water Management ◽  
Spontaneous Combustion ◽  
Reference Value ◽  
Mechanical Equipment ◽  
Management Problem ◽  
Technology Research ◽  
Coal Spontaneous Combustion ◽  
Mining Company ◽  
Technical Management ◽  
Technical Issues

In this paper, We studied the technical issues of fully mechanized caving under aquifer in Tiebei mine of Zhalainuoer mining company，carry on analysis and studies from the electrical and mechanical equipment to the technical management and gave the solution, with some reference value. It is hard to mine one by one coal seam due to hydrogeology and deposit of2a seam, Tiebei mine. For example, It is hard to solve top seam management, hydrogeology management and coal Spontaneous combustion. For getting more coal and extend the service life of mine, We started trial coal mechanized caving under aquifer in 2004 on the research basis. At the beginning of coal mechanized caving, We encountered equipment problems, equipment assort usage problems，produce management problem, coal caving method problem, use of face-end support problem, water management problem, and so on. By continuously review experience and exploring ,We solved the problems one by one. So we gained coal mechanized caving under aquifer valued experience.

scholarly journals Influence of Air Supply on Coal Spontaneous Combustion During Support Withdrawal in Fully Mechanized Coal Mining and its Prevention

2021 ◽  
Author(s):  
Xiaowen Zhang ◽  
Xihua Zhou ◽  
Gang Bai ◽  
Cheng Wang
Keyword(s):  
Spontaneous Combustion ◽  
Characteristic Temperature ◽  
Effect Of Temperature ◽  
Withdrawal Period ◽  
Coal Spontaneous Combustion ◽  
Hydrocarbon Gases ◽  
Working Face ◽  
Air Supply ◽  
Spontaneous Combustion Of Coal ◽  
Temperature Programmed

Abstract It is important to study the oxidation characteristics of coal samples under different air supply rates to prevent spontaneous combustion of coal, particularly when the air supply rate at the working face needs to be changed during support withdrawal. In this work a self-designed temperature-programmed experimental device was used to study the change laws of various index gases released during the spontaneous combustion of coal under various air supply conditions. The study focused on the analysis of the low-temperature (30–200 ℃) oxidation stage, the increase in air supply, and the concentration change process of four hydrocarbon gases (C2H6, C3H8, C2H4, and C2H2) generated by the coal sample. The change law of the CO generation rate under the combined effect of temperature and air supply was analyzed, and surface fitting was performed to determine the characteristics of phased changes. Based on the working face parameters of the Yangchangwan Coal Mine, this study predicted the CO concentration at the upper corner of the working face at the characteristic temperature of coal spontaneous combustion during the withdrawal period. The paper summarizes comprehensive safety measures that can help prevent spontaneous combustion during the withdrawal period.

scholarly journals Overview of Research and use of Indicator Gases of Coal Spontaneous Combustion in China / Přehled Výzkumu a Využití Indikačních Plynů Samovznícení Uhlí V Číně

2014 ◽  
Vol 60 (1) ◽  
pp. 55-65 ◽  
Author(s):  
Xiyang Feng ◽  
Alois Adamus
Keyword(s):  
Spontaneous Combustion ◽  
Experimental Methods ◽  
Paper Briefly ◽  
Coal Spontaneous Combustion ◽  
Laboratory Equipment ◽  
Significant Development ◽  
The Sixties ◽  
Mine Fires ◽  
Spontaneous Combustion Of Coal ◽  
Program Characteristics

Abstract The beginnings of research and use of results in the area of indicator gas application for early detection of spontaneous combustion of coal in China comes from the sixties of the last century. The significant development occurred in the nineties, when the program “Characteristics of the adsorption of coal oxygen and its application in the prevention of mine fires” had been completed. The paper briefly describes an overview of the historical development, achievements, experimental methods, laboratory equipment, legislation, and the outlook for the use of indicator gases of coal spontaneous combustion in China

scholarly journals A Study on Preventing Spontaneous Combustion of Residual Coal in a Coal Mine Goaf

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yongjun Wang ◽  
Xiaoming Zhang ◽  
Yuichi Sugai ◽  
Kyuro Sasaki
Keyword(s):  
Spontaneous Combustion ◽  
Mine Ventilation ◽  
Ventilation Network ◽  
Leakage Flow ◽  
Coal Spontaneous Combustion ◽  
Economical Method ◽  
Long Period ◽  
Simulation Results ◽  
Spontaneous Combustion Of Coal ◽  
Residual Coal

The effectiveness of grouting scheme has been simulated to prevent the coal spontaneous combustion at a goaf in Haizi Colliery, China. The colliery has been operated for long period over 27 years and has a complex ventilation network including airflow leakages which could possibly lead to the spontaneous combustion of coal at goafs. Firstly, the mine ventilation simulator MIVENA was used to analyze the mine ventilation network airflows to control airflows in and out of working faces and goafs. As the second approach, numerical simulations were carried by the simulator FLUENT in order to predict spontaneous combustion of residual coal with leakage flow in the #3205 goaf. It was cleared that the goaf can be divided into three zones based on oxygen concentration in the goaf area. Finally, the numerical simulation results show that the slurry grouting method is able to be an effective and economical method by reducing porosity in the goaf area to prevent spontaneous combustion of residual coal.

scholarly journals Detection and location of places of spontaneous combustion of coal in mines due to gas anomalies on the earth’s surface

2020 ◽  
Vol 174 ◽  
pp. 01061
Author(s):  
Vyacheslav Portola ◽  
Alyona Bobrovnikova ◽  
Georgii Shirokolobov ◽  
Dmitiy Paleev
Keyword(s):  
Molecular Diffusion ◽  
Spontaneous Combustion ◽  
Control Method ◽  
Air Pressure ◽  
Coal Spontaneous Combustion ◽  
The Earth ◽  
Underground Fire ◽  
Spontaneous Combustion Of Coal

The effectiveness of localization and extinguishing of places of underground fires that occur in mine worked out spaces depends on information about the location of a place of spontaneous combustion. Existing methods to detect the processes of coal spontaneous combustion in mines include monitoring the content of gases in mine atmosphere, released during the spontaneous combustion of coal. However, this control method does not allow determining the location of a place of combustion, since the paths of gas movement in the worked out space are unknown. The surface gas survey allows to determine the location of the underground fire. The calculations showed that gases, generated in the fire seat, spread to the earth’s surface due to molecular diffusion, the thermal depression developed by the fire seat and the drops of air pressure created by the ventilation fans. The dependences of the distribution of fire gases content in rocks on the rate of drops of air pressure between the worked out space in a mine with a fire seat and the atmosphere on the surface of the earth are obtained. Mine researches have confirmed the formation of anomalies of fire gases in rocks and soil over places of spontaneous combustion of coal occurred in worked out space. When conducting a gas survey, it is sufficient to measure the content of fire gases in the soil at a depth of 0.5-1.0 m.

A Study of Wireless Monitoring early Warning Technology of Goaf Temperature Field

2012 ◽  
Vol 220-223 ◽  
pp. 1577-1583 ◽  
Author(s):  
Yong Fei Jin ◽  
Jun Deng ◽  
Wei Feng Wang ◽  
Xiao Kun Chen
Keyword(s):  
Temperature Field ◽  
Early Warning ◽  
Spontaneous Combustion ◽  
Warning System ◽  
Wireless Sensor ◽  
Coal Spontaneous Combustion ◽  
Wireless Monitoring ◽  
Technical Specifications ◽  
Spontaneous Combustion Of Coal ◽  
Monitoring And Early Warning

With regard to goafs where spontaneous combustion of coal is very likely to occur, wireless monitoring and early warning techniques in temperature field of goaf are raised. Wireless monitoring and early warning system in temperature field of goaf based on wireless sensor network is researched and developed. Comprehensive detection, identification and early warning in temperature field of goaf are realized. Key parameters of node deployment of wireless temperature sensor in goaf are figured out and the layout schemes are optimized. According to monitored temperature information, severity of coal spontaneous combustion in goaf is figured out; therefore, early warning methods at the position of fire source are determined. Results of industrial tests on site show that monitoring data acquisition, communication are of good timeliness and reliability, operation of the entire system is stable and key functions and technical specifications can meet the need of early identification and warning of coal spontaneous combustion.

scholarly journals An Experimental Study on the Heat and Mass Transfer of Liquid Nitrogen in a Loose Medium

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3464 ◽  
Author(s):  
Yang Zhang ◽  
Baiwei Lei ◽  
Bing Wu ◽  
Yu Meng ◽  
Binbin He
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Liquid Nitrogen ◽  
Spontaneous Combustion ◽  
Laboratory System ◽  
Coal Spontaneous Combustion ◽  
Flow Area ◽  
Sensing System ◽  
Nitrogen Injection ◽  
Loose Medium

Liquid nitrogen is a vital medium during the extinguishing and chilldown process of coal spontaneous combustion in coal mine goafs. In this paper, the heat and mass transfer of liquid nitrogen in a loose medium was investigated. A laboratory system including a temperature sensing system was designed and built to explore the effects of different nitrogen injection positions and angles on the chilldown effect. The results indicate that after liquid nitrogen injection, the temperatures in the liquid nitrogen flow area and the bottom of the model can be quickly reduced to −196 °C, which was the best chilldown effect zone. With the vaporization of the liquid nitrogen, the cryogenic nitrogen gradually diffused. At 20,000 s, the bottom temperature was about –63 °C, the middle was –30 °C, and the upper was 0 °C. When the model angle was 0°, the effective chilldown zone was the largest. As the angle increased, the effective chilldown volume and holding time decreased significantly. The model angle had a greater impact on the chilldown. For the position of nitrogen injection, the inlet was set slightly farther from the gas outlet’s position, leading to a larger coverage for the liquid nitrogen and cryogenic nitrogen chilldown. This study can provide a theoretical basis for the flow and chilldown of nitrogen injection in goafs.

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