GB696191A - Plants for producing compressed air - Google Patents

Abstract

696,191. Gas turbine plant; axial-flow compressors. SULZER FRERES SOC. ANON. March 11, 1952 [March 15, 1951], No. 6248/52. Classes 110(i) and 110(iii) In a plant for producing compressed air, in which the working air compressor 1 is driven by a gas turbine 4 which has its own compressor 2 for its combustion air, the compressor 1 is connected through a conduit 24 to an intermediate stage 25 of the compressor 2; the flow of air thus bled from the compressor 1 to the compressor 2 is adjusted by a valve 26. By this means, the amount of air delivered through a pipe 23 to the point of use, which may be a blast furnace, can be regulated. For further regulation, a blow-off valve 28 and, it may be, a valve 36, can be used. A non-return valve 33 and a cooler 32 may be provided. Fuel gas, such as blast furnace gas, is supplied by a compressor 6 to the combustion chamber 3, the supply being regulated. by adjusting a valve 20 and also by returning a proportion of the gas to the inlet pipe 19 through an adjustable valve 17 and, it may be, a turbine 34. The returned gas is cooled by a cooler 18. An alternating current dynamoelectric machine 30 normally acts as a generator to supply a network 31, but on occasion it acts as a motor to assist the turbine 4. It is connected to the turbine through gearing 29 and, it may be, means for disconnecting the drive, such as a hydraulic coupling or torque converter 35 or disengageable gearing. The turbine 4 exhausts through a preheater 5 for the combustion air. The fuel may be coal, preferably pulverized, or oil.