GB679026A - Process for the conversion of thermal energy into mechanical energy in a heat power plant comprising a gas turbine and a steam engine, and plant for carrying out this process - Google Patents

Abstract

679,026. Turbine plant. PAUKER, F. Sept. 26, 1949 [Aug. 11, 1943; Nov. 17, 1943; May 5, 1944], Nos. 24705/49, 24706/49 and 247 07/49. Class 110(iii) [Also in Group XII] A plant comprising a combination of gas and steam turbines is provided with extra air to cool the combustion gases before the resultant mixture enters the gas turbine, and the exhaust gases from the latter are used to generate steam in a boiler surrounding the steam turbine for the latter. Cooling air and fuel may be fed from a hollow shaft 57, Fig. 5, by way of ducts 59 in a rotor 58 and hollow blades 60 to an annular combustion chamber 61. The gases pass through nozzle 70 and mix with air from passages 69 and pass through guide and moving blades 67, 60 to the steam generator. The firing means 66 may be used only for starting up or continuously. In a second arrangement, Fig. 4, a compressor 1a supplies combustion air and cooling air to a central combustion chamber 5a which feeds gas turbines 2a, 3a, and the exhaust gases plus the warmed cooling air are then led to the steam generator for the steam turbine (not shown). The compressor and turbines are arranged on a common shaft. The burner 6a for the combustion chamber is annular and supplied with compressed air through nozzles 7a arranged peripherally on both sides of the burner. Additional air is supplied to the combustion chamber, after cooling various parts, through inlets 8a. Part of this air flows through a duct 10a to cool parts of the turbine 3a. One air cooling stream is branched off at 17 to pass through a duct 19 around the exhaust gas collecting chamber 12a. The air stream then flows to the hub of the impeller 22 upwards through a chamber 21 on the impeller, through the hollow blades 23 to join the exhaust gas stream. A further air current 24 is led through a channel 26 and is divided into streams 25, 27, the former feeding the inlets 8a. Part of the stream 27 flows radially inwards through hollow guide blades 30. Some warmed air passes down ducts 31 to supply nozzle 7a. In Fig. 7 automatic control means are supplied to maintain constant the gas temperature (through the fuel inlet) and to maintain constant the steam temperature by varying the feed-water admission to the steam boiler. A gas turbine 71 is supplied with fuel by a tank 72 and drives an air compressor 73. The steam turbine 76 is jacketed by a boiler 75 and is connected to a condenser 77. A temperature control device 78 is heated by exhaust gases from the turbine 71 to control a fuel pump 86 which feeds the fuel tank 72. A similar device 79 controls the boiler feed pump 81 which conveys water from the condenser 77 to the boiler 75. The device 79 may vary the pump speed or adjust a valve position. For starting purposes, an auxiliary blower may supply hot air through the stationary gas turbine to generate steam in the boiler to start up the steam turbine.