863,558. Gas turbine plant. PRVNI BRNENSKA STROJIRNA ZAVODY KLEMENTA GOTTWALDA, NARODNI PODNIK. Sept. 19, 1958 [Sept. 20, 1957], No. 30039/58. Class 110(3). In a gas turbine plant working on a mixed cycle, heat extracted by cooling water during the compression phase from both the open and closed parts of the cycle is utilized by mixing the cooling water with the gaseous medium flowing in the open part of the cycle. In Fig. 1, air from the atmosphere is compressed in compressor K 1 and is then mixed with air from the closed part of the cycle discharging from air preheater R 2 . The mixture of air then flows through cooler CH 1 where it is cooled by water, the air then flowing through a second compressor K 2 having an interstage cooler CH 2 wherein the air is again cooled by water. The high-pressure air then divides into two streams, one for the open cycle part of the system and the other for the closed cycle part. The first air stream flows through a saturator S into which the cooling water from the coolers CH 1 , CH 2 is injected being thereby vaporized. The mixture of air and water vapour then flows through heat-exchanger R 1 wherein it is preheated before passing to combustion chamber S 1 wherein fuel is burned in the air, the combustion products then passing to the turbine T 1 . The gases from the turbine T 1 are reheated in combustion chamber S 2 and then pass to the low-pressure turbine T 2 , the exhaust gases therefrom passing through the heat-exchanger R 1 and finally discharging to atmosphere. The second stream of air from the compressor K 2 is preheated in a heat-exchanger R 2 and is then further heated indirectly in a heat-exchanger in the main combustion chamber S 1 , the heated air then passing to the turbine T 3 , the exhaust air then passing through the heat-exchanger R where it gives up heat, and is then mixed with air discharging from the compressor K 1 as before. In Fig. 2, air from the atmosphere is compressed in compressor K 1 and then together with air from the closed cycle part of the system, is further compressed in compressor K 2 , the air being cooled by water in interstage coolers CH 1 and CH 2 and after cooler CH 3 . The air from the cooler CH 3 divides into two streams, one for the open cycle part of the system and the other for the closed cycle part. The first stream of air passes through a further cooler CH 4 and is then further compressed in compressor K 3 before discharging into saturator S where heated water from the coolers CH 1 , CH 2 , CH 3 , also CH 5 , is mixed with it being thereby vaporized. The mixture of air and water vapour is then preheated in heat-exchanger R 1 and then passes to combustion chamber S 1 where fuel is burned in it, the resulting combustion products then passing through turbine T 1 , reheat chamber S 2 , where further fuel is burned in them, turbine T 2 , heat-exchanger R 1 , where the gases give up heat to the air and water vapour mixture from saturator S and finally discharge through turbine T 3 and exhaust to atmosphere. The second stream of air from the cooler CH 3 is further compressed in compressor K 4 and is then pre-heated in heat-exchanger R 2 and further heated in a heat-exchanger disposed in the main combustion chamber S 1 . The heated air then passes to turbine T 4' is re-heated in a heatexchanger disposed in the re-heat combustion chamber S 2 , then passes to low-pressure turbine T 5 , discharges therefrom to flow through heatexchanger R 2 where it gives up heat to air issuing from the compressor K 4 , and is finally cooled in cooler CH 5 before again entering compressor K 2 together with air from the compressor K 1 . The water to be injected into the compressed air may be further heated by providing water cooling spaces around the combustion chambers, heat-exchangers and other hot parts of the plant.
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