Gas turbine and air turbine installation and method of operating a power station installation, in particular a gas turbine and air turbine installation

摘要

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.