Effects of particle size, dust concentration and dust-dispersion-air pressure on rock dust inertant requirement for coal dust explosion suppression in underground coal mines

2019 ◽  
Vol 126 ◽  
pp. 35-43 ◽  
Author(s):  
Sikandar Azam ◽  
Devi Prasad Mishra
Keyword(s):  
Particle Size ◽  
Coal Dust ◽  
Coal Mines ◽  
Dust Concentration ◽  
Air Pressure ◽  
Dust Explosion ◽  
Explosion Suppression ◽  
Underground Coal Mines ◽  
Dust Dispersion ◽  
Rock Dust

Study on explosion suppression of coal dust with different particle size by shell powder and NaHCO3

Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121709
Author(s):  
Xiangrui Wei ◽  
Yansong Zhang ◽  
Guangan Wu ◽  
Xinyan Zhang ◽  
Yaqing Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Coal Dust ◽  
Explosion Suppression ◽  
Shell Powder

scholarly journals Analysis of the similarity of hard coal mines in terms of the number of dangerous incidents caused by the activation of natural hazards

2019 ◽  
Vol 2 (1) ◽  
pp. 91-100
Author(s):  
Magdalena Tutak
Keyword(s):  
Rock Burst ◽  
Natural Hazards ◽  
Coal Dust ◽  
Coal Mines ◽  
Hard Coal ◽  
Dust Explosion ◽  
Coal Basin ◽  
Taxonomic Analysis ◽  
Upper Silesian Coal Basin ◽  
Roof Rocks

Abstract Hard coal mines and mining enterprises involved in hard coal exploitation in the area of the Upper Silesian Coal Basin (Górnośląskie Zagłębie Węglowe) are characterised by the presence of natural hazards typical of this type of exploitation. These hazards include the risks related to methane, coal dust explosion, endogenous fires, as well as rock burst and caving of roof rocks. The article presents the results of a taxonomic analysis aimed at determining the similarity of hard coal mines and mining enterprises in Poland in terms of the dangerous incidents caused by the risks related to methane, coal dust explosion, endogenous fires, as well as rock burst and caving of roof rocks. The analysis was carried out for the 2008-2018 data and encompassed a total of 26 hard coal mines and mining enterprises located in the Upper Silesian Coal Basin. The analysis was performed using the k-means method of non-hierarchical clustering. The main objective of the article was to determine homogenous groups (clusters) of mines exhibiting the greatest similarity in terms of dangerous incidents caused by the activation of natural hazards in the years 2008-2018. These data can be successfully used for the development of preventive measures and risk analyses for these enterprises.

Maximum Acceptable Weights of Lift for Common Coal Mine Supply Items

1992 ◽  
Vol 36 (10) ◽  
pp. 654-658
Author(s):  
Sean Gallagher ◽  
Christopher A. Hamrick
Keyword(s):  
Energy Expenditure ◽  
Coal Mine ◽  
Coal Mines ◽  
Metabolic Cost ◽  
The Other ◽  
Task Duration ◽  
Underground Coal Mines ◽  
Different Levels ◽  
Considerable Experience ◽  
Rock Dust

A series of psychophysical lifting studies was conducted to establish maximum acceptable weights of lift (MAWL) for three supply items commonly handled in underground coal mines (rock dust bags, ventilation stopping blocks, and crib blocks). Each study utilized 12 subjects, all of whom had considerable experience working in underground coal mines. Effects of lifting in four postures (standing, stooping under a 1.5 m ceiling, stooping under a 1.2 m ceiling, and kneeling) were investigated together with four lifting conditions (combinations of lifting symmetry and lifting height). The frequency of lifting was set at 4 per minute, and the task duration was 15 minutes. Posture significantly affected the MAWL for the rock dust bag (standing MAWL was 7% greater than restricted postures and kneeling MAWL was 6.4% less than stooped); however, posture interacted with lifting conditions for both of the other materials. Physiological costs were found to be significantly greater in the stooped postures compared to kneeling for all materials. Other contrasts (standing versus restricted postures, stooping under 1.5 m ceiling versus stooping under 1.2 m ceiling) did not exhibit significantly different levels of energy expenditure. Energy expenditure was significantly affected by vertical lifting height; however, the plane of lifting had little influence on metabolic cost. Recommended acceptable workloads for the three materials are 20.0 kg for the rock dust bag, 16.5 kg for the ventilation stopping block, and 14.7 kg for the crib block. These results suggest that miners are often required to lift supplies that are substantially heavier than psychophysically acceptable lifting limits.

Numerical simulation of coal dust explosion suppression by inert particles in spherical confined storage space

Fuel ◽  
2019 ◽  
Vol 253 ◽  
pp. 1342-1350 ◽  
Author(s):  
Xiang Wang ◽  
Xingwang Huang ◽  
Xinyan Zhang ◽  
Yansong Zhang ◽  
Yaqing Zhang
Keyword(s):  
Numerical Simulation ◽  
Coal Dust ◽  
Dust Explosion ◽  
Storage Space ◽  
Explosion Suppression ◽  
Inert Particles

Pneumatic Robot for Monitoring Hazardous Environments of Coal Mines

2013 ◽  
Vol 198 ◽  
pp. 120-125 ◽  
Author(s):  
Leszek Kasprzyczak ◽  
Stanisław Trenczek ◽  
Maciej Cader
Keyword(s):  
Coal Dust ◽  
Coal Mines ◽  
Electric Energy ◽  
Hard Coal ◽  
Dust Explosion ◽  
Pneumatic Drive ◽  
Hazardous Environments ◽  
Remote Measurements ◽  
Technical Solutions ◽  
And Control

The GMRI robot is capable of inspecting hazardous zones of methane and/or coal dust explosion in hard coal mines. The robot enables remote measurements of the concentrations of methane, carbon monoxide, carbon dioxide, oxygen, temperature, and humidity. Cameras enable the robot to observe the state of the excavation. All electronic circuits of the robot, for measurements, control, transmission, and supply, are intrinsically safe. The transmission of data and control commands from/to the operators console are performed via an electric wire. Moreover, the wire enables to transmit intrinsically safe electric energy and is used to charge one of the accumulators. Thanks to that, the robot can operate in an isolated excavation for 3 months. An intrinsically safe pneumatic drive has been applied for setting wheels in motion. The non-commercial robot prototype was tested in a real excavation in an active hard coal mine. The technical solutions have been presented in the paper.

scholarly journals Empirical Models of Zones Protecting Against Coal Dust Explosion

2017 ◽  
Vol 62 (3) ◽  
pp. 611-619 ◽  
Author(s):  
Dariusz Prostański
Keyword(s):  
Research And Development ◽  
Coal Dust ◽  
Empirical Models ◽  
Dust Concentration ◽  
Mining Institute ◽  
Dust Explosion ◽  
Dust Deposition ◽  
National Centre ◽  
Mine Workings ◽  
Methods Of Measurement

Abstract The paper presents predicted use of research’ results to specify relations between volume of dust deposition and changes of its concentration in air. These were used to shape zones protecting against coal dust explosion. Methodology of research was presented, including methods of measurement of dust concentration as well as deposition. Measurements were taken in the Brzeszcze Mine within framework of MEZAP, co-financed by The National Centre for Research and Development (NCBR) and performed by the Institute of Mining Technology KOMAG, the Central Mining Institute (GIG) and the Coal Company PLC. The project enables performing of research related to measurements of volume of dust deposition as well as its concentration in air in protective zones in a number of mine workings in the Brzeszcze Mine. Developed model may be supportive tool in form of system located directly in protective zones or as operator tool warning about increasing hazard of coal dust explosion.

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