Abstract: The invention relates to a method for operating a steam power plant comprising a steam generator and a combustion chamber associated therewith, wherein pre-warmed combustion air is guided therein in addition to a fossil fuel. According to the invention, said plant can be operated with a particularly high efficiency ratio in various operating conditions. As a result, the combustion air is at least partially released after the pre-warming thereof and before the introduction thereof into the combustion chamber. A steam power plant which is particularly suitable for carrying out said method comprises, in addition to a pre-air warmer, an air turbine which is mounted downstream from said pre-air warmer in a fresh air pipe.

Abstract: A gas turbine and air turbine installation includes a gas turbine to which, downstream of its exhaust gas end, the primary side of a heat exchanger for heating air is connected. In this arrangement, the heat exchanger includes an air turbine connected downstream of its secondary side. By this, a gas turbine and air turbine combined process can be realized which, compared with a pure gas turbine process, is associated with an increase in efficiency and power. The installation concept can be employed particularly advantageously in areas short of water where a conventional gas/steam installation or a steam power installation can hardly be realized because of the requirement for water. Further, a method of operating a power station installation involves waste heat in the exhaust gas of a gas turbine being used to do work to drive an air turbine.

Abstract: The invention relates to a method for operating a steam power plant comprising a steam generator and a combustion chamber associated therewith, wherein pre-warmed combustion air is guided therein in addition to a fossil fuel. According to the invention, said plant can be operated with a particularly high efficiency ratio in various operating conditions. As a result, the combustion air is at least partially released after the pre-warming thereof and before the introduction thereof into the combustion chamber. A steam power plant which is particularly suitable for carrying out said method comprises, in addition to a pre-air warmer, an air turbine which is mounted downstream from said pre-air warmer in a fresh air pipe.

Abstract: The invention relates to method for cooling a gas turbine according to which compressed air is extracted from a compressor connected upstream from the gas turbine for feeding said gas turbine and is used as cooling air. Cooling efficiency and yield are increased by means of cooling the compressed air through heat exchange with an air stream and feeding the gas turbine with cooled compressed air for cooling it. The invention also relates to a gas turbine installation comprising a gas turbine and a compressor connected upstream from said gas turbine, with at least one cooling air duct extending from the compressor. The primary side of a heat exchanger is connected to the air cooling duct and its secondary side is connected to a duct through which an air stream flows for supplying the heat exchanger.

Abstract: A gas turbine and air turbine installation includes a gas turbine to which, downstream of its exhaust gas end, the primary side of a heat exchanger for heating air is connected. In this arrangement, the heat exchanger includes an air turbine connected downstream of its secondary side. By this, a gas turbine and air turbine combined process can be realized which, compared with a pure gas turbine process, is associated with an increase in efficiency and power. The installation concept can be employed particularly advantageously in areas short of water where a conventional gas/steam installation or a steam power installation can hardly be realized because of the requirement for water. Further, a method of operating a power station installation involves waste heat in the exhaust gas of a gas turbine being used to do work to drive an air turbine.

Abstract: As the development of gas and steam turbine systems has progressed, the steam turbine section, in particular, has become highly sophisticated and complex by being configured as a three-pressure system. In order to make a gas and steam turbine system of economic interest for medium and low power levels as well, and with high efficiencies, the steam turbine section is configured as a two-pressure system, and the combustion air for the system is compressed in at least two stages. In the process, the combustion air is cooled after at least one compression stage, and is heated at least after the last stage of the two stages.