| 摘要 |
<p>A steam turbine system comprises a steam turbine (6) driving electric generator (10), a heat recovering steam generator (8), and a gas turbine (2) driving electric generator (4). The steam generator (8) converts feed water into steam using heat exchanger coils (22, 24, 26, 28, 30 and 32) disposed at different places along a duct (20) carrying the hot exhaust gases from the gas turbine in directions A and B. Coil (22) is a boiler feed water heater, (24) a low pressure evaporator, (26) an economiser, (28) a high pressure evaporator, (30) a reheater, and (32) a superheater. The steam turbine has a high pressure cylinder (34), and intermediate pressure cylinder (36), and a low pressure cylinder (38). Superheater (32) supplies high pressure steam to the cylinder (34), reheater (30) supplies intermediate pressure steam to the cylinder (36) which supplies an output of low pressure steam to the cylinder (38). A fuel gas burner (56) is mounted in the duct between the superheater (32) and the reheater (30) to provide heat augmenting the heat in the exhaust gases. If desired another fuel gas burner (58) may be provided between the reheater (30) and the evaporator (28), and/or another fuel gas burner (60) may be provided between the gas turbine (2) and the superheater (32). The fuel gas can be natural gas which may power the gas turbine (2). The system can be used to generate electric power in a power station.</p> |
