Abstract: A radial expander having a rotor mounted in a housing and comprising multiple blades. The blades together with a radially inner hub contour of a rotor hub and a radially outer housing contour define flow channels for the process gas, which process gas to be expanded enters in a radial direction and from which expanded process gas exits in the axial direction. The radially inner hub contour of the rotor includes a curvature change at least in some circumferential positions seen in the meridional section such that adjacent to a flow leading side of the rotor, the radially inner hub contour, seen in the meridional section, is curved radially to the outside and adjacent to a flow trailing side of the rotor, the radially inner hub contour, seen in the meridional section, is curved radially to the inside.

Abstract: A method for operating a compressor. A flow rate of the process gas through the compressor is determined. Dependent on a measured inlet pressure of the compressor and a measured outlet pressure of the compressor, a delivery head of the compressor is determined. A surge limit controller, dependent on the flow rate and dependent on the delivery head determines a control variable for a control element interacting with the compressor such that the compressor is operated along a control line, which has a defined distance from the surge limit of the compressor. A proportion of steam of the process gas is determined, and the control line, along which the compressor is operated, is adapted dependent on the proportion of steam.

Abstract: The disclosure relates to a method for controlling a system for separating carbon dioxide from the ambient air. The method distinguishes between normal operation, in which carbon dioxide is separated from the ambient air, and special operation, which is not primarily used to separate carbon dioxide. Normal operation comprises conveying a stream of air of ambient air into a first process space of the system, wherein the stream of air is dried in the first process space. The dried stream of air of the ambient air is conducted from the first process space into a second process space, in which adsorption and subsequent desorption of carbon dioxide takes place. In the special operation mode, which takes place before or after normal operation, the system is operated with operating parameters that deviate from normal operation.

Abstract: The disclosure relates to a method for controlling a system for separating carbon dioxide from the ambient air. The method comprises conveying a stream of air of the ambient air into a first process space, wherein the stream of air is dried in the first process space, conducting the dried ambient air from the first process space to a second process space, adsorbing carbon dioxide from the dried stream of air with a sorbent material in the second process space, desorbing the carbon dioxide adsorbed in the sorbent material, and storing the desorbed carbon dioxide in a storage unit or transferring the carbon dioxide to a subsequent process. It is provided that the process parameters of the system for drying, adsorption and/or desorption are adjusted on the basis of a degree of loading of the drying agent or the sorbent material.

Abstract: A fuel injector for an internal combustion engine, which is configured for feeding fuel to a cylinder, having a housing, via which the fuel injector can be mounted to the internal combustion engine, a valve body engaging with a valve stem interacting with a valve seat, which can be moved relative to the valve seat for opening a fuel flow, having a bellows sealing element, which with a first end engages with the valve stem and with a second end with the housing, a sleeve body, which at least partly decouples the bellows sealing element from a fuel flow through the fuel injector and from fuel pressure pulsations.