scholarly journals Consideration on the Explosion Limit of Coal Dust-Rock Dust Mixtures in the High Concentration Region

1983 ◽  
Vol 99 (1150) ◽  
pp. 1035-1040
Author(s):  
Heiji ENOMOTO ◽  
Wataru ISHIHAMA
Keyword(s):  
Coal Dust ◽  
High Concentration ◽  
Concentration Region ◽  
Explosion Limit ◽  
Rock Dust

Effect of Particle Breakage on Explosibility of Coal/Rock Dust Mixtures due to Dispersion in 20-L Chambers

2019 ◽  
Author(s):  
Naseem Rayyan ◽  
Inoka E. Perera
Keyword(s):  
Specific Surface ◽  
Coal Dust ◽  
Particle Breakage ◽  
Explosion Chamber ◽  
Process Industries ◽  
Surface Areas ◽  
Coal Rock ◽  
Specific Surface Areas ◽  
The U.S ◽  
Rock Dust

Abstract Research has shown that particle size has a significant impact on the explosibility of coal dust/rock dust mixtures. Previous explosion studies conducted using the U.S. Bureau of Mines’ (BOM) 20-L explosion chamber tend to show a difference in the amount of inerting material needed to prevent an explosion when compared to the 20-L Siwek chamber. To reconcile these differences, samples were comparatively tested in the historic BOM 20-L chamber and the new NIOSH 20-L Siwek chamber with an emphasis on particle breakage. Rock dust and coal dust samples were dispersed in the chambers without ignitors and their specific surface areas were compared to the undispersed specific surface areas in order to quantify the breakage. Then, rock dust and coal dust mixtures were prepared, dispersed using the Siwek chamber, collected and tested for explosibility in the BOM 20-L chamber to see if the severe particle breakage in the Siwek chamber would influence the inerting limits of the BOM chamber. Results indicate that the particle breakage of friable brittle materials during explosion testing should be considered when evaluating the explosion risks in the process industries.

Numerical Simulation on Hydrogen Dispersion in Automobiles due to Storage Cylinder Failure

2011 ◽  
Author(s):  
Yan-Lei Liu ◽  
Jin-Yang Zheng ◽  
Shu-Xin Han ◽  
Yong-Zhi Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Hydrogen Sensor ◽  
High Concentration ◽  
Concentration Region ◽  
Species Transport ◽  
Safety Design ◽  
Simulation Results

A numerical model for dispersion of hydrogen in hydrogen powered automobiles was established basing on finite element method with species transport and reaction module of FLUENT. And corresponding numerical simulations were done in order to analysis the dispersion of hydrogen due to leakage from different position of the storage cylinder on the automobiles. Also, the distribution of the hazard region due to hydrogen dispersion was obtained. The simulation results show that the baffle above the cylinder can accumulate the hydrogen. Therefore, the high concentration region of hydrogen exists near the baffle. The study can provide reference for hydrogen sensor placement and safety design of hydrogen powered automobiles.

scholarly journals Sampling and analysis method for measuring airborne coal dust mass in mixtures with limestone (rock) dust

2016 ◽  
Vol 13 (4) ◽  
pp. 284-292 ◽  
Author(s):  
T. L. Barone ◽  
J. R. Patts ◽  
S. J. Janisko ◽  
J. F. Colinet ◽  
L. D. Patts ◽  
...  
Keyword(s):  
Coal Dust ◽  
Analysis Method ◽  
Dust Mass ◽  
Limestone Rock ◽  
Rock Dust

Heat capacities and volumes of NaCl, MgCl2, CaCl2, and NiCl2 up to 6 molal in water

1981 ◽  
Vol 59 (21) ◽  
pp. 3049-3054 ◽  
Author(s):  
Gèrald Perron ◽  
Alain Roux ◽  
Jacques E. Desnoyers
Keyword(s):  
Aqueous Solutions ◽  
Long Range ◽  
Higher Order ◽  
Heat Capacities ◽  
Range Order ◽  
Long Range Order ◽  
High Concentration ◽  
Concentration Region ◽  
Partial Molar Heat Capacities ◽  
High Concentrations

It has been claimed by Enderby and co-workers that changes in long-range order occur in NiCl2 aqueous solutions at high concentrations. To investigate the possibility of a transition, the partial molar heat capacities and volumes of NiCl2, CaCl2, MgCl2, and NaCl were measured and compared in water at 25 °C up to 6 mol kg−1. In the case of NaCl, data were also measured at 5 and 45 °C. A slight change in slope of [Formula: see text] is observed for NiCl2 around 4 mol kg−1 which may suggest a third or higher order transition. However, the change is too small to support unambiguously any particular model for the high concentration region.

scholarly journals Assessing the effectiveness of inertization of brown coal dust with limestone rock dust

2017 ◽  
pp. 31-43
Author(s):  
Jelena Markovic ◽  
Rijad Sisic ◽  
Kasim Bajramovic
Keyword(s):  
Brown Coal ◽  
Coal Dust ◽  
Limestone Rock ◽  
Rock Dust

The Research and Application of Efficient Dust Control System for Whole-Rock Comprehensive Mechanization Driving Face

2014 ◽  
Vol 955-959 ◽  
pp. 1020-1023 ◽  
Author(s):  
Wen Nie ◽  
Nai Guo Wang ◽  
Wei Min Cheng ◽  
You Ying Ma ◽  
Ya Ru Sun
Keyword(s):  
Control System ◽  
Short Distance ◽  
Coal Dust ◽  
Dust Control ◽  
Respirable Dust ◽  
High Concentration ◽  
Air Curtain ◽  
Random Movement ◽  
Comprehensive Mechanization ◽  
Purification System

To prevent high concentration dust on whole-rock comprehensive mechanization driving face efficiently, air curtain dust drawing and purification system were developed. This system is consisted of two sections, air curtain dust drawing device and dust purification system device. It determines optimized parameters of air curtain drawing dust device by combining site actual conditions and has realized short distance 3d dust absorbing and random movement. After using the efficient dust control system for whole-rock comprehensive mechanization driving face on south main return way,the average dust-laying rate of total coal dust and respirable dust in manually operation department, respectively reach 91.6% and 90.5%.It shows that this system is a efficient means for dust control of whole-rock comprehensive mechanization driving face.

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