Coal dust is a fine- powdered form of coal which is created by the crushing, grinding, or pulverization of coal rock. Because of the brittle nature of coal, coal dust can be created by mining , transporting, or mechanically handling it.
21-597: (Redirected from B/W ) B&W , B/W or B+W may refer to: Companies [ edit ] Babcock & Wilcox , an American manufacturing company Brown & Williamson , a former American tobacco company, now merged with R. J. Reynolds Bowers & Wilkins , a British loudspeaker company Bra & Wessels , a Swedish chain of department stores, since 2001 known as Coop Forum Burmeister & Wain , Danish ship yard and diesel engine producer Boeing & Westervelt, precursor company to Boeing B+W Filterfabrik,
42-489: A fugitive combustible dust such as coal dust. Many explosions from combustible dust are due to accumulation on walls, floors, and other surfaces. The accumulation of uncontrolled coal dust in a workplace is a dangerous situation that needs to be eliminated. The control of coal dust can be improved by implementing the use of dust-approved vacuums, dust collection systems, methods to reduce fugitive coal dust, and following general housekeeping procedures. To prevent explosions, it
63-592: A photographic filter manufacturer now owned by Schneider Kreuznach Other [ edit ] Black and white , as it refers to photography or cinematography Grayscale Power Macintosh G3 (Blue & White) , a computer model made by Apple Computer College van Burgemeester en Wethouders , the Dutch municipal executive Black & White Festival , the Portuguese audiovisual festival b/w (meaning "backed with"), an abbreviation often used to separate
84-609: A supplier to the Manhattan Project . After the war they entered the nuclear reactor business, and became a major supplier for commercial nuclear power plants. They also built naval nuclear reactors, including for the first commercial nuclear ship . In 2000 the company filed for bankruptcy due to lawsuits from employees over asbestos exposure; they emerged from bankruptcy in 2006. The company had works association football teams which played at senior level in Scotland and
105-405: Is nutty slack . For use in thermal power plants , coal is ground into dust using a device called a powdered coal mill . The resulting product, called powdered coal or pulverized coal , is then generally used in a fossil fuel power plant for electricity generation . Pulverized coal is a significant dust explosion hazard, as large quantities are suspended in air for transfer from the mill to
126-563: Is an American energy technology and service provider that is active and has operations in many international markets with its headquarters in Akron, Ohio . Historically, the company is best known for their steam boilers . The company was founded in 1867 in Providence, Rhode Island , by partners Stephen Wilcox and George Babcock to manufacture and market Wilcox's patented water-tube boiler . B&W's list of innovations and firsts include
147-449: Is best to promote and execute good hygiene practices in the workplace by controlling both the coal dust and any possible ignition sources. Some ignition sources that may need to be controlled or used carefully around coal dust includes heavy machinery, electrical components, and open flames or sparks. The main attempts at preventing explosions due to coal dust include using safety lamps , adding stone dust coffers to mine galleries to dilute
168-423: Is difficult due to the coal dust being such a fine particle, allowing it to escape and be suspended in the air for a large amount of time. Coal dust suspended in air is explosive—coal dust has far more surface area per unit weight than lumps of coal, and is more susceptible to spontaneous combustion . However, five elements are needed for an explosion to occur: oxygen, an ignition source, coal dust, dispersion of
189-455: Is suspended in air outside the controlled environment of grinding and combustion equipment. It poses the acute hazard of forming an explosive mixture in air and the chronic hazard of causing pulmonary illness in people who inhale excessive quantities of it. The distribution of the particle-size of coal dust is frequently measured in mesh . The British slang term for cheap fuel consisting of coal dust (slack) containing small lumps of coal (nuts)
210-527: The Luisenthal Mine disaster in Germany, which claimed 299 lives in 1962, and the worst: the explosion at Benxihu Colliery , China, which killed 1,549 in 1942. Such accidents were usually initiated by firedamp ignitions, the shock wave of which raised coal dust from the floor of the mine galleries to make an explosive mixture. The problem was investigated by Michael Faraday and Charles Lyell at
231-643: The United States; Babcock & Wilcox F.C. reached the second round of the Scottish Cup on two occasions, and the American side was runner-up once in the American Cup . Pulverized coal Grinding or pulverizing coal to a dust form before combusting it improves the speed and efficiency of burning, which makes the coal easier to handle. However, coal dust is hazardous to workers if it
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#1732802311190252-662: The coal dust, and confinement of the dust. For instance, a nearly empty coal store is a greater explosion risk than a full one. This is due to the increase of space in the store for oxygen and dispersion to take place. The worst mining accidents in history have been caused by coal dust explosions , such as the disaster at Senghenydd in South Wales in 1913 in which 439 miners died, the Courrières mine disaster in Northern France which killed 1,099 miners in 1906,
273-412: The coal dust, watering workings and ensuring efficient ventilation of all the workings. Another means of preventing explosions is by placing rock dust in the coal mine, which is usually pulverized limestone dust, which absorbs thermal energy from the heated gasses. Rock dusting has been used since the early 1900s, but there have been technological improvements since then. Since then, NIOSH developed
294-442: The colliery at Haswell County Durham of 1844, but their conclusions were ignored at the time. Coalworker's pneumoconiosis, or black lung disease , is caused by inhaling coal dust, typically dust produced in coal mining . Government agencies in the United States have set exposure limit guidelines for coal dust inhalation. For safe handling/storage of coal dust, the dust must be controlled, maintained, and protected properly. With
315-461: The legal limit ( Permissible exposure limit ) for coal dust exposure in the workplace as 2.4 mg/m (5% SiO 2 ) over an 8-hour workday. The National Institute for Occupational Safety and Health (NIOSH) has set a Recommended exposure limit (REL) of 1 mg/m (measured by MSHA) or 0.9 mg/m (measured by ISO/CEN/ACGIH) over an 8-hour workday. It is always the best practice to maintain a clean workplace and control any hazardous material, especially with
336-405: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=B%26W&oldid=1058317238 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Babcock %26 Wilcox Babcock & Wilcox Enterprises, Inc.
357-531: The listing of the two sides of a vinyl record , especially a 45 record Blue and White (political alliance) , a political alliance in Israel See also [ edit ] BW (disambiguation) Black and white (disambiguation) Monochrome (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title B&W . If an internal link led you here, you may wish to change
378-407: The power plant. Explosions have occurred when the flow drops and flames in the burning chamber pass back along the ductwork delivering fuel. Coal dust is a fugitive combustible dust - a dust that is both a pollutant and combustible when dispersed into the air. Due to the small particle size and combustible nature of this dust, there is a risk of an explosion and inhalation. The control of coal dust
399-424: The presence of coal dust within multiple industries, such as: mining, energy generation, and concrete production, different approaches are necessary. However, a common procedure to undergo is the three C's: contain, capture, and clean. Following this procedure can help prevent unnecessary inhalation or explosions from occurring if following correctly. The Occupational Safety and Health Administration (OSHA) has set
420-473: The world's first installed utility boiler (1881); manufacture of boilers to power New York City's first subway (1902); first pulverized coal power plant (1918); design and manufacture of components for USS Nautilus , the world's first nuclear-powered submarine (1953–55); the first supercritical pressure coal-fired boiler (1957); design and supply of reactors for the first U.S. built nuclear-powered surface ship, NS Savannah (1961). The company
441-421: Was founded in 1867 by Stephen Wilcox , Jr. and his partner George Herman Babcock with the intention of building safer steam boilers. Stephen Wilcox first avowed that “there must be a better way” to safely generate power, and he and George Babcock responded with the design for the first inherently safe water-tube boiler. B&W was the main builder of naval boilers for American forces during World War II, and were
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