Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume N . 66

Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume N . 66

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: much greater in the larger grades, air will freely circulate through a thick bed of largesize fuel, such as grate, when it will move only with difficulty through a much thinner bed of, say, No. 3 buckwheat. When the first attempts were made to burn the buckwheats, it was found that natural draft would not cause sufficient air to move through the fire to maintain rapid combustion. Industrial plants, therefore, introduced forced or induced draft of some sort. The steam-jet blower was doubtless the first, the simplest, and probably the cheapest of these means of creating artificial draft; this was successful in a degree but was soon followed by the fan. Combustion has been further perfected by placing the fuel on a traveling grate, and passing it successively over compartments carrying different draft pressures. These pressures are so arranged as to furnish the amount of air best suited to the fire conditions existing above them and to provide for complete combustion of the fuel before the refuse is discharged over the end of the grate into the ashpit. Already this arrangement is making present-day silt, or coal passing a %4-in. (1.2 mm.) circular opening and containing probably at least 10 per cent, of moisture, a usable commercial fuel for power production. Two other means of utilizing anthracite fines that are in limited use are briquetting and the burning of such fines in suspension. The first, while employed extensively in Europe, has never found great favor at the mines of this country. The product of the process is sold in direct competition with the domestic sizes of freshly mined coal. The second method has passed the experimental stage and is just entering that of commercial application. Time will determine the scope and possibilities...
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Product details

  • Paperback | 292 pages
  • 189 x 246 x 15mm | 526g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236621867
  • 9781236621863