Abstract: The thrust nozzle opening angle of two cycle gas turbine jet engines is controlled in a system which comprises a low pressure compressor driven by a low pressure turbine. A first compressor is arranged radially inward for a first flow cycle or circuit and a second compressor is arranged radially outward for a second flow cycle or circuit. A high pressure compressor is driven by a high pressure turbine. A combustion chamber is situated upstream of the high pressure turbine. An afterburner is supplied with the turbine gases from the first, hot flow cycle and with compressed air from the second, relatively cool flow cycle or circuit. The system may have multiple shafts. The control is effected with reference to the instantaneous pressure relationship (.pi.NVZ) between the static pressure (p.sub.sD) downstream of the radially outer compressor (1a) of the second flow cycle (k2) and the static pressure (p.sub.sE) of the air flowing into the propulsion system. This ratio constitutes a variable rated control value (.

Abstract: A plant for producing power from solid fossil fuels, more particularly bituminous coal, is made up of at least one boiler in which the solid fuels are burned. The plant furthermore has a steam turbine and a gas turbine for producing power from the gas, the gases being cleaned of dust and sulfur before running into the gas turbine. The boiler of the plant is a pressure-fired boiler in which firing takes place in the dry condition, that is without melting of ash.