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The paper discusses the influence of rock dust particle size on the inerting requirment of coal dust/air mixtures using coal from the Prince mine of the Cape Breton Development Corporation, Nova Scotia. Two size fractions (fine and coarse) of coal and several broad and narrow fractions of limestone were reproduced.
explosion pressure of the resulting explosion will be much greater than 7 atg. This explains the observation generally made that servere damage from a firedamp explosion does not occur at the seat of the explosion but away from it. Experiments on gas explosion phenomena in the U.S. Bureau of Mines experimental coal mine (20] using natural gas ...
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Dispersible rock dust must be applied to the surfaces of entries in underground coal mines in order to inert the coal dust entrained or made airborne during an explosion and prevent propagating explosions. 30 CFR. 75.2 states that “… [rock dust particles] when wetted and dried will not cohere to ...
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Other research has shown that the coal or rock dust accumulated on the rib or roof surfaces or other elevated surfaces (overhead dust) is easier to disburse or entrain into the turbulent air created by an explosion shock wave than dust on the mine floor (Nagy, 1981; Owings et …
Other research has shown that the coal or rock dust accumulated on the rib or roof surfaces or other elevated surfaces (overhead dust) is easier to disburse or entrain into the turbulent air created by an explosion shock wave than dust on the mine floor (Nagy, 1981; Owings et al., 1940).
The paper discusses the influence of rock dust particle size on the inerting requirment of coal dust/air mixtures using coal from the Prince mine of the Cape Breton Development Corporation, Nova Scotia. Two size fractions (fine and coarse) of coal and several …
and solubility to determine how the limestone rock dust behaved during the coal dust/rock dust explosions. The preliminary results are reported in this paper and indicate that the chemistry of limestone plays an important role in its capacity to inhibit coal dust explosions. The results also
Ongoing NIOSH research has specified the most desirable attributes for a rock dust to effectively inert coal dust and thereby prevent or suppress a propagating coal dust explosion. This paper builds on that research and quantifies the “light blast of air” specified in 30 CFR 75.2 using a laboratory-scale dust dispersion chamber.
The parameters of explosive characteristics of the coal-dust are assessed systematically with the test device of minimum ignition temperature of dust clouds and 20L sphere explosion test units.
Oct 13, 2017· As the primary means of defense against coal dust explosions within United States mines, rock dusting has been shown to successfully prevent flame induction in both experimental procedures and real life applications. Image Credit: Mark Agnor/ Shutterstock.com. References: “Rock dusting makes coal mining a little safer” – Aggregates Manager
• 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 …
MSHA rock dusting regulations were initially based upon data generated within the Bruceton Experimental Mine (BEM) by the U.S. Bureau of Mines (BOM) which suggested that the largest-sized coal dust particle that participated in explosions was 850 µm (Rice et al., 1922).At that time, the authors stated that the following circumstances may prevent 20 mesh coal dust from propagating:
Coal dust explosions in underground coal mines are prevented by generous application of rock dust (usually limestone). If an explosion should occur, the rock dust disperses, mixes with the coal dust and prevents flame propagation by acting as a thermal inhibitor or heat sink.
experimentation to remove any ... 20-L and the Fike Corporation 1-m3 explosion chambers. Coal and rock dust samples were prepared by sieving and were used to …
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Does Line Rock Dust Eliminate Coal Dust Explosions Experimental. does line rock dust eliminate coal dust explosions experimental The study revealed that the proportion of rock dust required to inert the coal dust explosion increases with the decrease in the coal dust size and increase in the rock dust size
Underlying this sampling method was the assumption that in the event of an explosion, the coal and rock dust would disperse from all surfaces and would either enhance or inhibit propagation depending on the percentage of incombustible content. Float coal dust is constantly produced as a consequence of active coal mining.
The dry dust generates the best lift characteristics and dispersibility as the buoyant nature of rock dust is essential for coal dust explosion mitigation (McDonald, 1938).When an underground coal mine explosion occurs, rock dust must be readily disperse so as to effectively quench the flame front of the propagation (McDonald, 1938, Greenwald, 1938a, Cybulska, 1988).
of such explosions and especially cases caused by mixturesof ﬂam-mable gases and dusts (hybrid fuels). This explosion often occurs in coal mines which start with a methane air explosion and entrain coal dust as the ﬂame propagates down the mine gallery. Hybrid ﬂames have been studied by several researchers [2–9],
A coal dust explosion occurred when the flame ignited coal dust put into suspension by previous blasts. Sufficient quantities of rock dust were not applied to the mine surfaces and coal dust propagated the explosion throughout the entire mine. This coal dust explosion claimed the lives of five more miners (DOL/MSHA 1982).
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.
The rock dust lain on the tunnel ground has a significant suppression effect on the explosion overpressure, flame temperature and velocity of methane with coal dust. When the rock dust …
Sources of Limestone, Gypsum, and Anhydrite for Dusting Coal Mines to Prevent Explosions Page: ... conducted in such manner as to keep down the production of coal dust, the amount of rock dust required will be reduced. The amount ... and Anhydrite for Dusting Coal Mines to Prevent Explosions, report, 1925; Washington D.C..
rock dust, and the type and size of coal dust. While examining the data from many coal and rock dust mixtures, it was observed that the normalized reflectance, Φ, measured by the optical reflectance meter, appeared to be constant for a given coal dust at the limit of explosibility, independent of the coal particle size.
Aug 31, 2013· The dangers of coal dust are inhaling the dust which goes into your lungs and skin irritation from dust. Coal dust is harmful for the most part and has no health benefits.
shown that mixing a suf cient quantity of inert rock dust with coal dust will prevent coal dust explosions by acting as a heat sink. The requirements are speci ed in the Coal Mine Health and Safety Act of 1969 (US Congress, 1969) and in Title 30, Section 75.403 of theUS Code of Federal Regulations (2006). They mandate that the nation s