Gas turbine combined cycle system
AssigneeCombustion Engineering, Inc.
InventorsCarl R. Bozzuto, Joseph D. Bianca, Walter F. Siddall
Life of this patent
Estimating the term…
Abstract
An improved gas turbine combined cycle system having a diffuser duct between the gas turbine and steam generator. The diffuser duct has boundary layer suction to prevent gas jet separation, thereby reducing pressure loss and improving gas velocity profiles in the duct, while eliminating the need for internal flow controls. The gas turbine combined cycle system can be vertically oriented to reduce the plan area of the system and provide for convenient use of a symmetrical diffuser duct and the use of forced circulation on the water side of the steam generator.
Claims16
A gas turbine combined cycle system, comprising:
- a gas turbine which emits an exhaust gas,
- a steam generator for receiving the exhaust gas,
- a diffuser duct between the gas turbine and steam generator for reducing the flow velocity of the exhaust gas prior to entry into the steam generator, the diffuser duct having a diverging portion including a wall with an inner wall surface,
- boundary layer suction means for removing gas from along the inner wall surface of the diffuser duct in order to minimize the overall pressure drop in the diffuser duct, and
- means for reinserting into the system at least a portion of the removed gas.
A method for reducing separation of a gas jet in a diffuser duct of a gas turbine combined cycle system, the diffuser duct:
- having a diverging portion including a wall with an inner wall surface, the method comprising using boundary layer suction means to remove gas from along the inner wall surface of the diverging portion of the diffuser duct, and reinserting the removed gas at an upstream or downstream location.
A gas turbine combined cycle system comprising:
- a gas turbine having an inlet and which emits an exhaust gas,
- a steam generator for receiving the exhaust gas,
- a diffuser duct between the gas turbine and steam generator for reducing the flow velocity of the exhaust gas prior to entry into the steam generator, the diffuser duct having a diverging portion including a wall with an inner wall surface, and
- a gas removal line for removing gas from along the inner wall surface of the diffuser duct in order to minimize the overall pressure drop in the diffuser duct, the gas removal line having an inlet end formed in the wall of the diffuser duct and an outlet end connected to the turbine inlet.
Dependencies are inferred from the claim text.