Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 1-5

Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers Volume 1-5

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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. 1877 edition. Excerpt: ...our furnace chills. These phenomena tell us that we have two elements which limit the productive power of the furnace. First, the cooling of the hearth, as indicated by the lowering of the quality of the iron, and, finally, by the danger of chilling; secondly, the tendency to form scouring ferrous Blae, which endangers the structure of the furnace itself. Considering now the first of these elements, we know that, since the grade of the product is dependent upon the temperature of the hearth, the rate at which we can produce iron of any particular grade is limited by the fact that, if we drive the furnace beyond a certain speed, we make the hearth too cold to produce iron of that grade. Now, how is it that increasing the speed of the furnace cools the hearth? The heat in the hearth is derived from--(1.) The heat of the blast. (2.) The combustion of C to CO; and (3.) The heat intercepted by the descending column of minerals from the gases, and returned to the hearth. It is consumed--(1.) In melting the iron and slag. (2.) In heating the gases; and (3.) In direct radiation and conduction. Now, when we increase the speed of our furnace, we increase the first two elements of the heat requirement of the hearth; that is, we have more iron and slag to be melted and a greater weight of gas to be heated per minute. We also increase two elements of the heat development in precisely the same ratio, provided we do not derange the working of the furnace; that is, the weight of blast, and with it the heat brought in by the blast, are increased at the same rate, as is also the weight of C burned to CO. The third element of the heat development will be increased in nearly the same ratio, as a corresponding greater mass of minerals wilk arrive at the hearth per...show more

Product details

  • Paperback | 266 pages
  • 189 x 246 x 14mm | 481g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236611969
  • 9781236611963