초록 ▼

A steam cooling system (30) and associated methods are provided which have a first high pressure (HP) steam turbine (12) having a straight through configuration, a second intermediate pressure (IP) steam turbine (16) having a straight through configuration positioned adjacent the first HP steam turb

A steam cooling system (30) and associated methods are provided which have a first high pressure (HP) steam turbine (12) having a straight through configuration, a second intermediate pressure (IP) steam turbine (16) having a straight through configuration positioned adjacent the first HP steam turbine (12), and a balance piston (40) positioned adjacent the inlet (17) of the second IP steam turbine (16) and between the second IP steam turbine (16) and the first HP steam turbine (12). A steam cooling conduit (32) is preferably positioned to have an inlet adjacent the first HP steam turbine (12) and an outlet adjacent the balance piston (40) for providing a steam cooling path therebetween. The system (10) also has a controller (31) positioned to control cooling steam pressure, a cooling steam control valve (35) connected to the conduit (32) and the controller (31), a first pressure sensor (33) in communication with the controller (31) and positioned adjacent the inlet (17) of the IP turbine (16) and downstream from the balance piston (40) for sensing inlet pressure to the second IP steam turbine (16), and a second pressure sensor (34) positioned in communication with the controller (31) in the conduit (32) upstream from the first pressure sensor (33) and the balance piston (40) and downstream from the cooling steam control valve (35) for sensing conduit cooling steam pressure so that the cooling steam control valve (35) operationally opens and closes to maintain the cooling steam conduit pressure at a predetermined level greater than the inlet pressure of the second IP turbine (16).

대표청구항 ▼

1. A steam cooling system comprising:a first high pressure (HP) steam turbine having a straight through configuration; a second intermediate pressure (IP) steam turbine having a straight through configuration positioned adjacent the first HP steam turbine; a common heated steam conduit region positi

1. A steam cooling system comprising:a first high pressure (HP) steam turbine having a straight through configuration; a second intermediate pressure (IP) steam turbine having a straight through configuration positioned adjacent the first HP steam turbine; a common heated steam conduit region positioned between the HP steam turbine and the IP turbine to supply steam substantially simultaneously to the IP steam turbine and the HP steam turbine; a balance piston positioned adjacent the inlet of the second IP steam turbine and between the second IP steam turbine and the first HP steam turbine; a cooling steam conduit having an inlet adjacent the first HP turbine and an outlet adjacent the balance piston for providing a steam cooling path therebetween; and steam pressure controlling means responsive to sensing differences in steam pressures and connected to the cooling steam conduit for controlling cooling steam pressure during cooling steam flow between the first HP turbine and the second IP turbine so that the cooling steam conduit pressure is operationally maintained at a predetermined level greater than the inlet pressure of the second IP turbine.