General Electric Review Volume 21 (Paperback)

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. 1918 Excerpt: ...for such plants. Something may be gained by such a plan, but the probable saving would be small compared to the amount which would be saved by substituting central-station power. Fig. 1 shows the approximate coal consumption for Coal Consumption (1915) of Small Central Stations; Data from Tenth Annual Report Public Service Commission, State of New York small central stations. The large modern central station can produce power on 1J4 to 2% pounds of coal per kw-hr. Fig. 2 is a similar curve for isolated plants and is drawn from published data. Coal for heating or manufacturing processes is not included. If all the load of these isolated plants (Fig. 2) could be taken over by the central stations (Fig. 1), the minimum saving in coal would be about 40 per cent. If the load could be taken over by some of the larger central stations, the saving would be from 40 to 60 per cent. Fig. 3 is an approximate comparison of fuel consumption (under test conditions) i /2 tS /, /S Mitlion /tiiowatt tiours Output per Yeor Fig. 2. Coal Consumption of Isolated Power Plants (a) Actual test on 500-kw. isolated plant, reciprocating engine (condensing). (b) Possible economy based on remodeling boiler plant of (a). (c) Small turbo-generator plant. (d) Large modern turbo-generator plant. (c) Typical fuel consumption curve for a small turbo-generator such as is used by small central stations. (d) Same as (c) except for a large modern turbo-generator such as is used by large central stations. The fuel consumption of an electric power plant is affected to a considerable extent by the peak or maximum load which must be carried for a short time, and also by the size of the installation required to care for the maximum probable load. The diversity-factor, which is the ratio of the maximum ..