โ Scribed by R.H.O.
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Steam Pipes for Hottest Turbine to Run Dull Red.--The 100,000-kw. turbine recently shipped by the Westinghouse Electric Corp. for installation at the Sewaren Generating Station of the Public Service Electric and Gas Co. of New Jersey will operate at such high temperatures and pressures that the steam pipes feeding it will glow a dull red. Steam at 1500 lb. pressure and 1050ยฐF. will feed the new 3600-rpm. tandem compound double flow machine. This is the first steam power plant to be constructed for operation under such conditions.
While the highest temperature previously used in turbines is 1000ยฐF., it is the last 50ยฐF. that makes the job tougher. To withstand operating in the dull red region steam containers such as the throttle valves, steam chests and other high pressure parts of the turbine are constructed of 18-8 stainless steel. Fabrication of parts from this hard-to-work material has been a problem in itself.
The importance of the 50 ยฐ rise in temperature is in the fuel savings. For each 50 ยฐ increase, the quantity of coal required to produce one kilowatt hour of electrical energy is decreased by about 1.4 per cent. In 1915 the output of all our steam power plant turbines averaged only 525 Kwh. per ton of coal burned. With further developments towards increased plant efficiency, the output of all steam power plants by โข945 was 1550 Kwh. per ton of coal burned. These figures include both old and modern plant equipment in service during the year mentioned. This new turbine will produce about 2500 Kwh. of electrical energy from each ton of coal burned.
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