Alstom Technology Limited

Asea Brown Boveri Ag

Jost Braun

Jürgen Gerhard Hoffmann

Stefan Rofka

Juergen Gerhard Hoffmann

Thomas Zierer

Dieter Rebhan

Uwe Möller

A gas turbine group is provided with at least one cooling apparatus for cooling the working medium before and/or during the compression. The cooling power of the cooling apparatus can be adjusted by suitable means. A controller controls the cooling power of the cooling apparatus as a function of a control deviation in the useful power of the gas turbine group. The cooling controller interacts with other controllers of the gas turbine group in such a way that the gas turbine group is itself always operated at least close to its full load operating state. In this context, it is preferable for the inlet guide vane row of the compressor to be maximally open, and for the hot-gas temperature on entry into the turbines to be controlled so that it is constantly at an upper limit value.

Method for operating a gas turbine group

A method of operating a gas-turbine power plant is described, having a gas-turbine plant ( ) in which an oxygen-containing gas is drawn in, compressed and fired and, after passing through a turbine stage, is fed as discharging hot gas ( ) to a waste heat boiler ( ), from which the cooled exhaust gas ( ) is fed to an outlet ( ) and then to the free atmosphere. The invention is characterized in that a specific reduction in the flow velocity with which the exhaust gas ( ) flows through the outlet ( ) is effected in the region of the latter, with a simultaneous pressure increase downstream in the outlet ( ), and in that the pressure conditions occurring inside the outlet ( ) are transmitted free of losses between the gas turbine ( ) and the outlet ( ) via a gas-tight flow path of the hot and exhaust gases ( ).

Gas-turbine power plant

A gas turbine plant includes at least one compressor compressing intake air, at least one component for heat supply heating the intake air compressed by the compressor, at least one gas turbine using as a working medium the hot air from the component for heat supply, and at least one generator coupled to the gas turbine. A cooling device is provided which permits the cooling of at least a portion of the intake air and/or a portion of partially compressed intake air within the at least one compressor.

Gas turbine plant and process for limiting a critical process value

A turbomachine, in particular a gas turbine, is in the traditional manner provided with air cooling of the components that are subject to a high thermal stress. The cooling system (21, 31, 41) is provided with elements through which another medium (25, 35, 45), for example water or steam, can be added to the cooling system during peak demand. This medium displaces cooling air (26, 36, 46) from the cooling system, the air being then available additionally in a heat generator (2, 4). This means that more fuel (12, 13) can be added without increasing the hot gas temperature (T.sub.1, T.sub.3) at the turbine inlet (301, 501), and the power is increased. The quantity of the medium added to the cooling system is controlled by control elements (24, 34, 44) as a function of a control deviation (P.sub.set -P.sub.act) of the power.

Growing community of inventors

Waldshut-Tiengen, Germany

Jost Braun