Labor Saving at Limestone Quarries

Labor Saving at Limestone Quarries

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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. 1919 edition. Excerpt: ... slicing of the fire, too large openings in the dampers of the firing door, badly warped fire doors that can not be shut tightly, leaky settings, and firing doors kept open too long., HOLES IN THE FIRE. Holes in the fire are by far the most common cause of large excess of air in the flue gases and large losses of heat up the chimney. Such holes are entirely within the control of the fireman; therefore it is evidently his duty to prevent them. The forming of holes can be avoided by firing frequently and placing the coal on the thin spots of the fuel bed. The more frequent the firing the less chance there is for holes to form. Complete directions for firing are given in the first 20 pages of Technical Paper 80, Bureau of Mines, " Hand Firing Soft Coal Under Power-Plant Boilers." It often happens that if the fireman keeps the fire level by small and frequent firings, the steam pressure rises to the blowing-off point. The rise of the steam pressure is a result of two causes--Omore coal is burned than is needed, and there is no cooling effect from air entering through holes in the fuel bed. Then the fireman, in order to avoid wasting of steam, usually fires less often and thus lets the fire burn out in spots. As soon as he discovers that the fire is burning through, he should take steps to keep the fire free from holes. If he must put on more coal than is necessary to keep the pressure up, he should reduce the draft by partly closing the uptake damper, so that the coal will burn more slowly. In other words, the amount of coal fired should be adjusted to the demand for steam, and the volume of air flowing through the fuel bed should be adjusted by the draft damper to the amount of coal that must be burned. The fireman must grasp this...show more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236501403
  • 9781236501400