Mine Explosions overview | Explosion |

Prevention and suppression of coal-dust explosions It is much easier to prevent a coal dust explosion being initiated than arrest one. The measures for prevention and suppression of coal-dust explosion can be divided into the following three groups: 1. Measures which prevents or reduce formation and dissemination of coal dust underground 1.

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Experimental Investigation of Coal Dust

Wettability is one of the key chemical properties of coal dust, which is very important to dedusting. In this paper, the theory of liquid wetting solid was presented firstly; then, taking the gas coal of Xinglongzhuang coal mine in China as an example, by determination of critical surface tension of coal piece, it can be concluded that only when the surface tension of surfactant solution is

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Towards Estimating Entrainment Fraction For Dust Layers

Experimental setup in NIOSH tests. Top: Side view schematics of the mine 35 geometry, Left: Placing Coal/Rock dust mixtures on the shelves, Right: distributing dust on the floor. Figure 16. Measuring the amount of dust scoured during an explosion 36 Figure 17. Gas velocity recorded near the dust bed during the experimental mine test. 37

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Preventing Coal Dust Explosions in Underground Coal Mines • Heat transfer to the coal dust particles results in an exothermic reaction and expansion of the air in the entry. • As the explosion progresses, the pressure wave continues to disperse entry dust, adding fuel to the explosion. • Finer coal dust is more explosible and requires more rock dust to inert. Coal Dust: How to Prevent a

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MSHA - Rock Dusting Information - MSHA Rock

Generous applications of rock dust can prevent the propagation of coal dust explosions. The law requires that all areas of a coal mine that can be safely traveled must be kept adequately rock dusted to within 40 feet of all working faces. These are minimum requirements. REMEMBER - The chance of propagation and risk of widespread explosion disasters in bituminous coal mines can be nearly

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Coal Dust Particle Size Survey of U.S. Mines

sample to remove the limestone rock dust, sonic sieving to determine the dust size, and low temperature ashing of the sieved fractions to correct for any remaining incombustible matter. The results indicate that particle sizes of mine coal dust in intake airways are finer than those measured in the 1920's. The significance of these finer coal dust sizes is discussed relevant to the amount of

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Firefighting Precautions at Facilities with Combustible Dust

FIREFIGHTING PRECAUTIONS AT FACILITIES WITH COMBUSTIBLE DUST 1 Introduction Every year, a number of emergency responders are injured, and sometimes killed, during emergency operations in facilities where combustible dusts exist. In some cases, responders have inadequate information or training on the explosible 1

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Effects of different factors on the minimum

The effects of particle size, oil shale content, dust concentration, dispersion pressure and inert dust on the minimum ignition temperature (MIT) of coal and oil shale mixed dust clouds (COSMD) were investigated in a dust cloud MIT testing system to understand the intrinsic mechanisms of these factors affecting the MIT of COSMD.

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Hazard Alert: Combustible Dust Explosions

Hazard Alert: Combustible Dust Explosions Combustible dusts are fine particles that present an explosion hazard when suspended in air in certain conditions. A dust explosion can be catastrophic and cause employee deaths, injuries, and destruction of entire buildings. In many combustible dust incidents, employers and employees were unaware that

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PAPER OPEN ACCESS Development of research work in the air

transportation lines as well as methods to eliminate the risk of coal dust explosion. It describes technical solutions, the effects of these solutions and tests' results related to effectiveness of the described air-water solutions as well as water spraying devices. The spraying systems used in longwall shearers and roadheaders, on conveyor belt transfer points as well as the spraying

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A Standard Characterization Methodology for -

A key consideration for responsible development of mineral and energy resources is the well-being of workers. Respirable dust in mining environments represents a serious concern for occupational health. In particular, coal miners can be exposed to a variety of dust characteristics depending on their work activities, and some exposures may pose risk for lung diseases like CWP and silicosis.

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PHA - Stonehouse Process Safety

Magnesium Dust Explosion. Stonehouse Process Safety commentary: There are a number of reasons why metal dust explosions are particularly hazardous.First, dust cloud explosion temperatures and pressures for most organic materials are limited to about 2,300 o C and 9 barg respectively. In contrast, explosion temperatures and pressures for most metals can reach around 3,500 o C and 12 barg, and

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Experimental investigations on the roles of

Explosion behaviors of coal dusts were systematically investigated to focus on the roles of moisture in dust explosion. It is found that, when the moisture content is lower, the explosion

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MSHA - Program Policy Manual - Volume V;

Coal dust or coal and loose coal accumulations present a fire as well as an explosion hazard. The broken coal has considerably more surface area per unit mass than solid coal. For example, should an electric cable fail and cause an arc, the probability of igniting accumulations is greater than igniting solid coal. Also, when broken coal is ignited, fire propagates faster than in solid coal. As

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MSHA Approval Process - Scholars' Mine, Missouri

circuit protection for trailing cables in coal mines Part 29 Portable coal dust/rock dust analyzers, and continu­ ous duty, warning light, portable methane detectors for use in coal mines Part 33 Dust collectors for use in connection with rock drilling in coal mines Part 35 Fire-resistant hydraulic fluids Part 36 Approval requirements for permissible mobile diesel-powered transportation

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The world's worst coal mining disasters

The Mitsui Miike coal mine explosion on 9 November 1963, was the second deadliest coal mining disaster in Japan after the Mitsubishi Hojyo Coal Mine Disaster in 1914. 458 miners were killed in the accident and 833 were injured. It was a coal dust explosion around 500m below the mine's ground level entrance. The explosion led to a massive

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Hazard Prevention and Control in the Work Environment

Hazard Prevention and Control in the Work Environment: Airborne Dust WHO/SDE/OEH/99.14 1 Chapter 1 - Dust: Definitions and Concepts Airborne contaminants occur in the gaseous form (gases and vapours) or as aerosols. In scientific terminology, an aerosol is defined as a system of particles suspended in a gaseous medium, usually air in the context of occupational hygiene, is usually air

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