Abstract: The invention relates to a drive system for interior wind turbines, consisting of a rotatable tower (5) with a rotor mounted at hub height, the generator (16) being located at the foot of the tower (5) on a drive/generator platform (13) and the rotor torque being transferred from above downwards to the generator (16). Particular requirements are placed on such a drive system as the height of the interior wind turbine increases. A steel-wire-cable-reinforced flat belt (18) is used as a transfer element, the ends of which are joined in a particular way to form an endless belt the pretensioning of which is regulated dependent on the properties of the wind, and automatic monitoring is provided which executes an immediate controlled shut-down of the drive system if damage occurs.

Abstract: There is disclosed a process to produce fertilizer granules containing urea and ammonium sulfate with a high ammonium sulfate concentration of ≦60 wt. % in a fluidized bed granulator, which process comprises the steps of: a) a molten urea suspension consisting of ammonium sulfate having an average particle size of 30 to 300 &mgr;m and urea having a temperature range of 120 to 155° C. is produced, b) the molten urea suspension produced at the stage a) is then injected from below on the fine particles of urea/ammonium sulfate in a fluidized bed granulator by means of at least a nozzle, while the fluidized bed is loosened by a spouting air flow in the injection area, and subsequently, c) the fertilizer granules generated in the fluidized bed are separated and, if necessary, treated. Homogeneous urea/ammonium sulfate granules of an ammonium sulfate content between 30 and 60 wt.

Abstract: The invention relates to the utilisation of a decommissioned power station or industrial chimney (1) made of concrete as a tower for a wind converter (2) with a high electrical output with a rotor with a substantially horizontally arranged rotor axis (20), on whose point rotor vanes (9) are located in a flying manner, after shortening by a degree determinable on the basis of static and dynamic conditions, and attachment of securing means, upon which the wind converter is rotated eccentrically to and with a degree of rotational freedom about the vertical axis of the chimney, into the respectively optimum wind direction.Alternatively, a steel base (6, 7, 12, 16) may be set on the thus shortened chimney in order to mount the wind converter, in such a way that the rotor vanes can pass the chimney at a predeterminable spacing. (FIG.

Abstract: Disclosed herein is a process for the separate control of the methane and rare gas contents of an ammonia-hydrogen recovery-rare gas plant complex. By the controlled withdrawal of a purge gas from the synthesis gas circulation, splitting of the purge gas into two partial streams and recycling of a partial stream to the synthesis gas generation section, the increase in inert gas to be taken out of the synthesis gas circulation as a result of the modernization of the ammonia plant can be prevented negative effect on the downstream hydrogen recovery/rare; thus energetic disadvantages or costly expansions or modifications of the ammonia-hydrogen recovery-rare gas plant complex are voided.