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US20110283705A1

Methods, systems, and apparatus for generating energy from a process contained series of explosion cycles is provided. The Explo-Dynamics™ energy generating system includes several embodiments for stimulating the heat and pressure release episodes of the process configurations and translating the released forces into torque, thrust, motive force, and/or super-heat impulses.

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Coal Dust

Coal is a heterogeneous, carbonaceous rock formed by the natural decomposition of plant matter at elevated temperature and pressure in the earth's crust. The subject of this monograph is 'coal dust', itself a heterogeneous by-product of the mining and use of coal.

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rock wheel hydraulic cutting equipment mine

how does limestone rock dust eliminate coal dust explosions experimental; crusher for softer rock ore; mobile rock crusher ton; miners small gas rock crusher; small portable rock crushers rental south carolina; rock crushing process costs; rock process equipment

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Numerical Modeling of a Flooded

May 26, 2020Coal miner health and safety are primary concerns of mine operators. Although there are many challenging issues, high dust concentration has been, and still is, a major issue [].People working in underground coal mines can be exposed to high concentrations of airborne dust generated as a result of various mining activities, such as cutting, loading, and hauling [2,3,4,5].

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HHS Public Access

Controlling float coal dust in underground coal mines before dispersal into the general airstream can reduce the risk of mine explosions while potentially achieving a more effective and efficient use of rock dust. A prototype flooded-bed scrubber was evaluated for float coal dust control in the return of a continuous miner section.

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wherein a.sub.r is a constant based on the properties

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Effects of Inert Particulate Additives on Ignition and

Aug 21, 2020Abstract Non-combustible solid materials play a major role as inerting agents in explosion prevention. While the importance and application of these materials are well understood, there is still a lack of information about the actual mechanisms responsible for explosion suppression. Especially, the role of inert materials with a large specific surface area and the influence of the

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The Shot

Explosions. What of Dust in a Mine. a Dangerous Amount Degree of render Coal perature to Dust Fineness requisite Explosive. Temof Ignition.of Coal Dust. Quantity of Firedamp Inflammable to produce an Atmosphere in the necessary of Investigaof Coal Dust. Dr. Payne's Summary Presence tions. plosives Selection of ExGas.

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Hazardous Area ATEX Zone 1, Zone 2, Flameproof

If it not possible to eliminate the probability of an explosive dust/air mixture and a source of ignition at the same time, then explosion protective systems should be considered to halt an incipient explosion immediately or to mitigate the effects e.g. dust explosion venting systems.

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Experimental investigation of explosion

explosions include the safety to human life, and the loss of coal reserves. Explosion tests were carried out at the "Granit" Experimental Mine in Galleries with cross section of 9.5 m2. These tests were carried out with air - methane mixture explosions, which dynamic pressures of 0.1 up to 0.3 MPa were generated. Methane content was 9.5%.

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Lowering Miners' Exposure to Respirable Coal Mine Dust

May 01, 2014After August 1, 2016, the concentration limits for respirable coal mine dust are lowered from 2.0 milligrams of dust per cubic meter of air (mg/m 3) to 1.5 mg/m 3 at underground and surface coal mines, and from 1.0 mg/m 3 to 0.5 mg/m 3 for intake air at underground mines and for part 90 miners (coal miners who have evidence of the development

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OSHA Technical Manual (OTM)

Secondary explosions may occur when additional dust gets lofted into the air following an initial incident, providing the fuel necessary for multiple additional explosions throughout a facility. The dust fueling a secondary explosion may be dust released as a result of damage to a containment structure by the primary event; or, the release of

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dust explosion characteristics: Topics by

The surface density S.sub.c of coal dust on top of rock dust is calculated according to the equation: S.sub.c =1/-a.sub.c ln(V) wherein a.sub.c is a constant for the coal dust particles, and the surface density S.sub.r of rock dust on top of coal dust is determined by the equation:

Federal Register :: Proposed Information Collection

May 14, 2013A program for regular cleanup and removal of accumulations of coal and float coal dusts, loose coal, and other combustibles is essential to protect miners from explosions. Effective and frequent rock dust application is necessary to protect miners from the potential of a float coal dust explosion or, if one occurs, to reduce its propagation.

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Browse subject: Mine explosions

Coal-dust explosion tests in the experimental mine 1913-1918, inclusive, (Washington, Govt. print. off., 1922), by George S. Rice, H. P. Greenwald, Willard Leo Egy, and Lewis M. Jones (page images at HathiTrust) Coal and the prevention of explosions fires in mines.

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Review of Respirable Coal Mine Dust

Respirable coal mine dust (RCMD) exposure is associated with black lung and silicosis diseases in underground miners. Although only RCMD mass and silica concentrations are regulated, it is possible that particle size, surface area, and other chemical constituents also contribute to its adverse health effects. This review summarizes measurement technologies for RCMD mass concentrations

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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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Advanced mine ventilation: respirable coal dust

Advanced Mine Ventilation presents the reader with a unique book providing the theory and applications for designing mine ventilation with computers, controlling respirable coal dust and diesel particulate matter, combustible gas control and, mine fire management. The book summarizes the latest knowledge created in the past 40 years in these areas.

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Dust Explosions in the Process Industries, Third Edition

The experimental relationship found by Hattwig and Faber is. F,, (MN)=0.12*A (m2)*P,, (bar (g)) (1.15) 100 Dust Explosions in the Process Industries. This equation can be used for estimating maximumreaction forces expected in practice. P,,, is then the maximum permissible pressure Predfor which the vent is designed.

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mine of limestone dust

how limestone rock dust eliminate coal dust explosions : 4.8/5 3,961 ; Posts Related to how limestone rock dust eliminate coal dust explosions experimental. In underground mines, coal dust explosions are prevented by the addition of

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SISYPHUS

When coal dust collected in gassy shafts, explosions ripped. Rescuers punched through the barrier and found dead fathers embracing their sons, overcome by black damp— bodies bloated, blood and engulfing their mouths. Once, miners brought a mule named Tim to the surface for retirement after he had toiled for decades. At first, they turned

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On Making Coal Mining Safer, Or, It's The Fines, Stupid

Apr 07, 2010Coal dust is highly combustible (and the smaller the dust particles in any given volume of air, the more explosive potential exists), and there are lots of ways to create it: the mining machines create clouds of dust as they attack the walls, the conveyors carry dust through the mine, and vehicles stir up dust on the floors, to name just a few.

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Environmental Science Flashcards

Environmental science. Click card to see definition 👆. Tap card to see definition 👆. covers natural sciences, social sciences, and humanities to help us understand the world and our place in it. Click again to see term 👆. Tap again to see term 👆. What does the environment as studied by environmental scientists include.

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Dust retention efficiencies of dustfall collectors

article{osti_6140690, title = {Dust retention efficiencies of dustfall collectors}, author = {Nader, J S}, abstractNote = {An experiment was designed to evaluate the performance of three types of dustfall collectors by simultaneous exposure to actual field conditions. It was set up on the roof of a seven-story building located in a residential area adjacent to industrial plants.

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Dust Explosion Causation, Prevention and

Dust explosions occur in a variety of industries and have a recorded history stretching back over 200 years. In North America, a series of high-prole dust explosions investigated by the US CSB have renewed efforts to understand their causation, prevention and mitigation. While the dust explosion hazard may exist for many powders handled in

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US4146366A

A method of removing gangue materials from coal characterized by the steps of comminuting and sizing all of the material to have most particles of a size smaller than one hundred microns; slurrying in an alcohol containing 1 to 4 carbon atoms; thereafter separating by settling velocity separation into an overflow stream containing most of the valuable coal products for storage as a fuel or the

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JMS, Vol. 56, No. 2, 2020

The analysis of the found methane release from broken coal shows that methane release reduces as a quadratic dependence with decreasing drum rotation speed and number of picks per cutting line, and increases also as a quadratic dependence with growing thickness of coal seam and shearer web width.

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Dust explosion

Nov 09, 2016Most coal was strip or trench mined, and the pace of mining doesn't appear to have provided for a lot coal dust explosions. No easy to find documentary evidence of even a mine explosion surprised me. While DD technology levels are usually several centuries more advanced than a medieval setting, it's entirely possible that dust explosions aren

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v115n11a5 Mining complex geology, mitigation of

to insufficient methane and coal dust present in the working space. However, the most important aspect of preventing fires and explosions in underground coal mines is to eliminate the ignition sources, and cutting sparks are the most difficult ones to prevent. Avoidance of cutting quartz-containing hard

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The Modern Coal Mine

In comparatively recent years it was learned that coal dust was just as explosive as gas, that the fine dust lying about a mine was a potential source of death and disaster to all underground. By scattering coal dust along the experimental galleries the most impressive explosions have been caused upon firing a cartridge.

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Multiband infrared inversion for low

Methane gas explosions usually accompanied with coal dust blast are the major hazards in the face area of most coal mines as well as other mines considering that in many cases miners did not have sufficient time to escape from high-temperature, toxic gas sites [1,2]. Previous studies have shown that, during the 2001–2010 period, there were

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National Mining Ass'n v. Secretary, U.S. Dep't of

Jan 25, 2016Two separate groups brought pre-enforcement challenges to the MSHA's final rule, entitled Lowering Miners' Exposure to Respirable Coal Mine Dust, Including Continuous Personal Dust Monitors (New Dust Rule). On the first challenge, the court concluded that, consistent with the plain language of the Federal Mine Safety and Health Act of 1977 (Mine Act), 30 U.S.C. 801 et seq., and

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