Apparatus for cooling a gas turbine in a gas and steam turbine plant

Claim 2

In a gas-turbine and steam-turbine plant with a gas turbine and a waste-heat steam generator having heating surfaces located downstream of the gas turbine and connected in a water/steam loop of a steam turbine, the heating surfaces including an evaporator heating surface, an apparatus for cooling a coolant of the gas turbine, comprising: a water/steam separating tank connected to the evaporator heating surface of the waste-heat steam generator; an intermediate circuit including a first heat exchanger for cooling the coolant of the gas turbine, and a second heat exchanger, said second heat exchanger having a primary side communicating with said water/steam separating tank and a secondary side communicating with said first heat exchanger.

Claim 3

The apparatus according to claim 1, wherein said water/steam separating tank has a water side and a steam side, said primary side of said second heat exchanger having a primary side inlet communicating with said water side and a primary side outlet communicating with said steam side of said water/steam separating tank.

Claim 4

The apparatus according to claim 1, wherein said intermediate circuit further includes a pump for conveying a medium in said intermediate circuit, said pump being connected upstream of said first heat exchanger as seen in a flow direction of the medium within said intermediate circuit.

Claim 5

The apparatus according to claim 1, wherein said water/steam loop includes water as a tertiary medium, and including a pump connected upstream of said second heat exchanger, as seen in a flow direction through said second heat exchanger, for conveying the water serving as a tertiary medium out of the water/steam loop.

Claim 6

The apparatus according to claim 1, including a feed conduit communicating with said intermediate circuit for feeding additional water into said intermediate circuit.

Claim 7

The apparatus according to claim 1, including a feed conduit communicating with said intermediate circuit for feeding deionized water into said intermediate circuit.

Claim 8

The apparatus according to claim 1, including an auxiliary cooler selectively connectible into said intermediate circuit.

Claim 9

The apparatus according to claim 1, including a compensating tank connected in said intermediate circuit.

Claim 10

A gas-turbine and steam-turbine plant, comprising: a coolant-cooled gas turbine generating waste heat; a waste-heat steam generator receiving the waste heat from said gas turbine, said waste-heat steam generator including heating surfaces connected in a water/steam loop of a steam turbine; and a cooling system for cooling a coolant of said gas turbine, said cooling system including a water/steam separating tank connected to one of the heating surfaces of said waste-heat steam generator, an intermediate circuit with a first heat exchanger for cooling the coolant of said gas turbine, and with a second heat exchanger, said second heat exchanger having a primary side communicating with said water/steam separating tank and a secondary side communicating with said first heat exchanger.

Claim 11

A gas-turbine and steam-turbine plant, comprising: a coolant-cooled gas turbine generating waste heat; a waste-heat steam generator receiving the waste heat from said gas turbine, said waste-heat steam generator including heating surfaces connected in a water/steam loop of a steam turbine; and a cooling system for cooling a coolant of said gas turbine, said cooling system including a water/steam separating tank connected to one of the heating surfaces of said waste-heat steam generator, an intermediate circuit with a first heat exchanger for cooling the coolant of said gas turbine, and with a second heat exchanger, said second heat exchanger having a primary side communicating with said water/steam separating tank and a secondary side communicating with said first heat exchanger.