. Electric railway review . imilar buildings it wouldbe safe to estimate for 60-boiler-horsepower capacity for theheating of a 5,000-boiler-horsepower station. Of the totalamount of steam the percentage used foi heating is If the exciter engines have no other load than that ofexcitation, the exhaust of one engine will be just aboutenough to take care of the heating system. The heating system, together with the heater auxiliaries,■etc., should be connected to the atmospheric exhaust system. Heating system requirements cannot be determined to anygreat degree of nicety. There will be a
. Electric railway review . imilar buildings it wouldbe safe to estimate for 60-boiler-horsepower capacity for theheating of a 5,000-boiler-horsepower station. Of the totalamount of steam the percentage used foi heating is If the exciter engines have no other load than that ofexcitation, the exhaust of one engine will be just aboutenough to take care of the heating system. The heating system, together with the heater auxiliaries,■etc., should be connected to the atmospheric exhaust system. Heating system requirements cannot be determined to anygreat degree of nicety. There will be a constantly varyingdemand for exhaust steam and since the supply of exhauststeam is determined by the quantity of steam used to gen-erate power the boiler feedwater fed through the economiz-ers may vary in temperature between 125 and 210 is no serious objection to this change in feedwater tem-perature, nor is there any other way to better the a condensing plant using economizers it would be quite. Figure 176—(C18-4). wasteful and unnecessary to deliver live steam to the heaterin order to maintain a high water temperature. The system of exhaust steam heating which is beingconsidered may be operated with a back pressure on theauxiliaries or a vacuum return system on the heating collsand radiators. If a vacuum return system is used the airshould be allowed to enter and be discharged from the heateras shown in Figure 166. If the air were removed from theheater itwould cause a vacuum on the heater as well as onthe heating system. The vacuum pump for a heating sys-tem should be independent of the other station apparatus inorder that it may be shut down in the summer and run atnight in case all other machines were shut down. Thevacuum pump should deliver the return condensation andair to the exhaust heater, allowing the air to be precipitatedand leave the heater through the vent. If the plant is provided with surface condensers and buta small amount of st
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
