Document waqB6Jna5ZoBNgjg7x8mvLG6

U \\ r & 6j000 3POO K Got Mint s s, u tv din* " wit OUi pr MX tor TwravatM ol ccrrpri*w tnkl, f 4. Precooler ot compressor Inlet raises unit output ot high air temperatures J ILL Outdoor oi --tompemtun n(Aoo-to.t* r / / \ - r/ > Gottytn xn at tmpfrxrfurt T_L 2 S 9 12 91 How precooler will lower compressor Inlet temperature during summer doy I The 15rh*stoge compressor wheel shows method of -mounting blades temperature makes it attractive lor re* demotion of heat for feedwater. . Eshauit-Haot Recovery. In applying an exhaust-gas heat exchanger to the unit, determination of amount of trans fer surface was one of economics end indicated a unit of 18,950 eq ft Per formance of this heat exchanger with variable water and exhautt*gai Bow is shown in Fig. 6. -In normal routing of feedwater the heat exchanger will function in parallel with the closed heaters. Automatic con* trol will divide the flow to hold either constant feedwater temperature or fine! steam temperature. This control U desirable since the final steam temper* ature on the boilers is a function of feed temperature, see Fig. 7. For periods of redueed-load operation it may be necessary to operate steam units non* bleeding. For such operation the heal exchanger will be In series with the closed heaters. This will allow theji turbine to operate at full load. If it' desired to reduce the gas-turbine Igsldj during load-reduction periods, howevew then the routing can be left os describw] for normal. Performance. Fig. 8 shows the gsra] In kw output of the station by usliffl the gas turbine, also the heat rate of Ur1 additional capability and the heat ret of the gas turbine with no exhausi-ij recovery. Fig. 3 shows the station'heat balance] with the gas 'turbine operating and directly comparable with Fig. 2 showing the original heat balance. Results'ojj comparative performance studies\ijj variable backpressures and loads-srg shown In Figs. 9,16 and 17. Installation. Tbe entire project yrij] be engineered and designed by tnfl Pioneer Service & Engineering Co, Chi: csgo, and will be installed by the Cw Wt h w tut Vtf ? m dt go to 130 MO 130 160 170 160 190 200 210 Steam flow; 1,000 lb par hr it* J Boiler steam temperature depends on I feedwoter temperature and sfoom flow Stssm iwbtos Soc^vuwo, V* Ho 30 TO 00 CcnllpondVo tnbM lwp,F O For constant steom flow, combined . performance varies with backpressure 1 l4 $taem turbine bflrtprsssws.il, Hg Q With constant steom flow, combined v copocify remains olmost constant E1?* ^ruction 'Dept of .the OG&E Co. The ' gss turbine will be housed in an Inex* f,' peosive building added to one side of the existing plant, Fig. 18. With oper* ft! sling floor at seme level as existing turbine-room basement, the auxiliary .engineer will be responsible for the gas- * turbine operation. Natural- gas will be supplied to the Took at a minimum pressure of 100 psi. Ij^The compressor eir inlet equipped with js- s' filter and precooler is expeeted to gjbreduce intake air noise to* a reasonable level. b Turbine exhaust will flow through the rebuilding wall in an insulated duct and then downward through the heat, ex itchanger. The Inlet piece will heve a damper which can be positioned to allow K^free atmospheric exhaust if it becomes ^.-necessary to operate the gas turbine gcwith no water flow through the heat ex^changer. Exit gas will be convoyed from the heat exchanger to an unlined steel staek placed against the existing building well, extending up to just above the coping. The gos-turbioe building will have a standard crane with power hoist oper ated from the floor. Amplo laydown space is provided for overhaul of the unit. A lorge door will allow trucking or dollying any part of the equipment into the mein plant machine shop. The control board will be adjacent to the starting motor to make it more acces sible for tbe auxiliary engineer. The gas-turbine generator output .will go to the plant bus at 13.8 kv and will be used for system capacity, just as does the steam-turbine output. Gas Turbine Unit. Though the Gen eral Electric unit is designed for initial temperature of 1400 F, tests on an exact duplicate unit indicate that full load can be developed at a somewhat lower Eoch turbfno wheel Is built up of stainless rim- end few-olloy center 4 A The 15-stoge compressor rotor Is mode up of individual 1 A First holf of eompressor.eotlng Is also mode of on < I wheels bolted together, first six ore of aluminum ahoy -I v num alloy, remainder of rotor ond cosing Is of U (570] POWER September iM?"1'0'00 ld ol turbine flm- gfo ' . 00! OIM ol 1400 F >WtR , September 1948 1 C Turbine rotor consists of two wheels, eoch with Its own shaft/ bolted together. V First of two Impulse stages operates ot 1160 F. A fan cools the exhaust cosing. (521| 67