Notes on Electric Railway Economics and Preliminary Engineering

Notes on Electric Railway Economics and Preliminary Engineering

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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. 1904 edition. Excerpt: ...But with the introduction of steam turbines where no lubrication is required in the steam chambers, surface condensers will undoubtedly come into more general favor. In the siphon condensers the steam is led to a point about 34 feet above the surface of the water in the hot well, and is there mingled with the circulating water and condensed, producing a vacuum. Feed-water heaters are used to heat the water fed to the boilers, and utilize for this purpose the exhaust steam from the engine or auxiliaries before it is led to the condenser. They form a necessary part of the economical equipment of a power station. In some cases two sets of feed-water heaters are used--primary heaters for utilizing steam from the engines, and the secondary, steam from the pumps. From the heaters the feed water is often led to economizers, which consist of nests of tubes surrounding the flues at the base of the stack. Draft is provided either by a chimney or mechanically by fans. Mechanical draft possesses many advantages over natural draft, of which the most important is that the draft can be regulated according to the needs of the furnaces. In some stations natural draft is depended upon for all times, except to care for the peak of the load, when the capacity of the stacks is increased by running the fans. The cost of the main power station will vary from $78 to $133 per rated kilowatt capacity of the station, divided as follows: TABLE XII. Reciprocating Steam Engine Poicer-Station Costs Per Kilowatt. Jj0 Item. Maximum. Minimum. 1. Buildings $15 00 $8 00 2. Foundations 3 50 1 50 3. Boilers and settings 17 00 9 00 4. Steam piping and covering, etc 12 00 4 00 5. Engines 32 00 20 00 6. Generators 21 00 18 00 7. Pumps, etc' 1 00 1 00 8. Switchboards, etc 4 00 more

Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • United States
  • English
  • black & white illustrations
  • 1236898478
  • 9781236898470