A Text-Book of Elementary Metallurgy

A Text-Book of Elementary Metallurgy

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...Whitwell's Stove (Fig. 30) differs from Cowper's chiefly in the arrangement of the absorbing brickwork. The waste gases and air for combustion are admitted at several points of the stove, so that the combustion is more perfect. The regenerative brickwork is built so as to form a number of long and narrow vertical chambers, communicating with each other at the top and bottom. The blast furnace gases enter through TM A, and meeting with warm air, introduced through suitable passages, combustion takes place and the flame rising np c passes down the narrow passages x to the bottom. Here more air is admitted to burn the unconsumed gases, which rise up D and down through another series of narrow channels, leaving at the chimney valve E. When the stove is sufficiently heated, which takes about two hours, the gas and chimney valves are closed and the blast valve opened, the blast passing in inverse order to that of the gases, as in the Cowper stove. The "Waste Gases from a blast furnace contain by volume from 55 to 60 per cent. nitrogen, 7 to 12 per cent. carbon dioxide, 23 to 28 per cent. carbonic oxide, about 2 per cent. marsh gas, and from 2 to 6 per cent. of hydrogen, the three latter gases being combustible. The iron tapped from the blast furnace is run into sand moulds, forming ingots about 3 feet long and 3 or 4 inches in diameter, termed pigs. Various methods have from time to time been devised for collecting the waste gases of a blast furnace besides the cup and cone contrivance already described. In some small charcoal furnaces the top was left open, and an annular space formed in the masonry at the upper end of the body of the furnace. This space communicated with the interior by a number of openings, inclining upwards from...show more

Product details

  • Paperback | 58 pages
  • 189 x 246 x 3mm | 122g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236799801
  • 9781236799807