Professional Papers on Indian Engineering

Professional Papers on Indian Engineering

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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. 1880 edition. Excerpt: ...liquid cast-iron and a liquid cinder, instead of a ball of solid metal, mixed with part of the ash left from the fuel. In a modern blast furnace, the aim is always to obtain liquid cast-iron, instead of malleable metal, in the hearth, and with this object the furnace is made much higher than the stiickofen, and care is taken, in working it, to keep the product of the required character, by reducing the proportion of ore if a sufficiently carburetted liquid product is not obtained. Thus, in lighting a blast furnace, the practice is to put in comparatively little ore, in proportion to the fuel charged, until the furnace is fully hot, and pig iron of the required character has appeared at the hearth, and then to increase gradually the ratio of ore to fuel, as the furnace is found to bear it, until the maximum proportion is reached that will yield metal of the required quality. The same watchfulness is required, so long as the furnace is at work, to keep it on a uniform quality of product; the proportion of ore to fuel, and the "rate of driving," that is the amount of blast supplied, being increased or diminished from day to day, according as the furnace, from changes in the weather or from other accidental causes, is found to be working better or worse and producing more or less grey metal. When a blast furnace is driven too fast, so that the ore comes too quickly down into the hearth, before it has been sufficiently reduced and carburetted, the quality of the metal at once falls off, and either the rate of driving must be reduced or a larger proportion of fuel must be charged. The rate of driving that a furnace will bear is known only by trial. This tentative mode of working, though always adopted in regular blast furnace management, more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236576128
  • 9781236576125