Abstract: An arrangement for inserting a nozzle unit in a spinning device for spinning synthetic fibers has shafts extending through and movable relative to the opening of the device, means for detachably connecting the first end portion of the shafts to the nozzle unit, and drive means connected to the second end portion of the shafts and operative for pulling the latter. When the nozzle unit is connected to the shafts, and the latter are pulled by the drive means, the nozzle unit enters the opening of the device. The shafts may move vertically or along a curved trajectory. The connecting means may be formed as hooks pivotally connected to the first end portions of the shafts by hinges and engageable with loops mounted on the nozzle unit. Hollow beams filled with a heat-carrying agent are built in a body part of the device. Means for actuating the drive means are located outside the hollow beam, and preferably, below the same.

Abstract: Wet particulate coal and a current of hot dry gas at superatmospheric pressure are introduced into a substantially closed drying chamber to contact the material with the gas while maintaining the drying chamber under superatmospheric pressure so that the material is dried by the gas. The dried material is withdrawn from the drying chamber and the gas is withdrawn from the drying chamber and itself mixed with a stream of hot dry gas produced by burning a combustible and a combustion-supporting gas. This mixture is then reintroduced into the drying chamber as the current of hot gas used to dry the coal. The burner is operated at superatmospheric pressure and is formed of a jet-pump type injector, and a diffusor is provided downstream of this injector in the circulation path.

Abstract: In a coking installation moist coal to be converted into coke is dried and preheated by being contacted by a hot drying gas. The hot coke which is formed is subjected to a dry quenching in which at least a portion of the heat lost by the hot coke during the drying quenching thereof is imparted to the drying gas. There is provided a closed flow circuit for the continual recirculation of a body of drying gas. The closed flow circuit includes a portion in which the drying gas comes into contact with moist coal which is to be dried and preheated. When the drying gas comes into contact with the moist coal water vapor becomes mixed with the drying gas. The water vapor is removed from the drying gas by means of condensation.

Abstract: A roof ventilator for radial or axial exhaust, comprising a ventilator housing supported on a base plate and enclosing an impeller wheel driven by a motor of the internal-rotor type or the external-rotor type, said ventilator housing comprising bottom and hood components of mutually similar bowl-shape, and said components for different capacity ventilators and different mounting of the motors being interchangeable to selectively accommodate radial and axial exhaust installations.