Abstract: A method of controlling primary measures for reducing the thermal nitrogen oxide formation in gas turbines, the primary measures being controlled according to a characteristic which characterizes an air-quantity-specific heat release rate in a combustion chamber of the gas turbine. In order to approximately determine the heat release rate, the power output available at an output-side end of a useful-power shaft of the gas turbine is used, and the air quantity is determined as a function of the ambient conditions. The useful power is preferably determined from the electric terminal power output of a generator driven by the gas turbine, and the electric terminal power output is advantageously corrected with a term which takes into account the combustion-chamber pressure. Furthermore, when the air quantity is being determined, if need be the position of an adjustable preliminary guide row is also taken into account.

Abstract: A heat-insulating lining for a gas turbine which consists of a mat formed of ceramic fibers that is provided on its side facing the hot gas with a metal-oxide-containing layer, especially Al.sub.2 O.sub.3. The mat to be provided with the ceramic layer should possess a gross density of 350 to 450 kg/m.sup.3 and the fibers in the mat which are in contact with the metal oxide-containing layer are to be predominantly so oriented that the longitudinal axis of the fibers forms an angle of 30.degree. to 90.degree. with the metal oxide-containing layer. It is preferred if the fibers form an approximately right angle with the metal oxide-containing layer. The thus made coated heat-insulating linings possess a good mechanical stability with respect to the hot gases as well as an adequate thermo-shock resistance.