GB1001271A - Improvements in steam turbine and gas turbine power plants - Google Patents

Abstract

1,001,271. Steam turbine and gas turbine power plant. BABCOCK & WILCOX Ltd. Nov. 9, 1961 [Nov. 16, 1960; Oct. 3, 1961], No. 40128/61. Heading F1Q. A steam turbine and gas turbine power plant comprises a steam generator which supplies steam to the steam turbine or steam turbine group, and an air compressor which supplies combustion air to the furnace of the steam generator and air to the combustion chamber of the gas turbine, the steam generator furnace and the gas turbine combustion chamber being arranged for serial flow of gaseous fluid therethrough, an auxiliary steam turbine which receives part at least of the steam generated in the steam generator being provided to drive the air compressor. The steam generator 1 shown in Fig. 1 comprises economiser, evaporator, superheater and re-heater surfaces 2, 3, 4, 5 respectively, also a steam and water drum 6, steam from the superheater 4 passing to the high pressure auxiliary steam turbine 10 which drives an air compressor 31. Steam discharged from the turbine 10 passes through the re-heater 5 and then to the low pressure main steam turbine 13 which drives an electrical generator 27, steam discharging from the turbine to a condenser 14. The condensate then passes through feed water heaters 21, 22, 23 back to the economiser 2. The feed heaters 21, 22 are heated by steam bled from the turbine 13 while the feed heater 23 is heated by steam tapped from the line between the turbine 10 and the re-heater 5. A portion of the feed water may be passed through a by-pass 48 and heated in a heater 45 by exhaust gases from the gas turbine 42. Air from the compressor 31 passes through lines 30 and 29 to the furnace of the steam generator to which fuel is supplied through line 28, combustion gases from the furnace discharging through line 36 to the gas turbine combustion chamber 33, the combustion gases then passing to the gas turbine 42 which drives an electric generator 43, the turbine exhaust gases passing through the feed heater 45 and finally discharging to atmosphere. Air from the compressor 31 may pass direct to the combustion chamber 33 through line 35 under control of valve 41, or may pass through line 52 controlled by valve 53 into the line 36 through which gases from the furnace of the steam generator are passing to the combustion chamber. Fuel is supplied to the combustion chamber through line 34. A second high pressure steam turbine 61 may be disposed in parallel flow relation with the turbine 10, the turbine 61 being drivingly connected with the main turbine 13. In a second embodiment, Fig. 2, air delivered by the air compressor 131 passes straight to the combustion chamber 171, gases produced therein passing to the gas turbine 142 which drives an electric generator 143. Exhaust gases from the turbine pass through line 176 into the furnace of the steam generator 101, fuel supplied thereto through line 128 being burned with the unconsumed oxygen in the exhaust gases. The combustion gases from the furnace discharge through line 178 and after passing through the feed water heater 145 discharge to atmosphere. Exhaust gases from the turbine 142 may pass direct into the line 178 through the valvecontrolled line 179. The steam circuit is similar to that of Fig. 1.