Abstract: In a rake system, a reamer element is attached to a reamer arm, which is movable backward and forward. A pivot axle of the reamer arm is formed on the distal end of a control arm, which is pivotable around a further pivot axle. During forward movement of the reamer arm, the reamer element pushes raked material collected by the rake to a discharge edge at the upper end of the rake. During backward movement of the reamer arm, the control arm is lifted, and the reamer element is moved back at a distance from the rake.

Abstract: The invention relates to a catalytic reactor (1) with a compact construction, whose assembly prevents the biomaterial present in said reactor from fusing together and causing a malfunction. The reactor is characterized in that it is arranged vertically and consists of a reactor tube (2) and an internal tube (5). This forms an annular gap (7), across which the biomaterial to be treated is conducted from a mixing vat (3) to a conversion coal collector (4). The biomaterial is catalytically decomposed in the mixing vat (3) and the reactor tube (2) as a result of the supplied heat. The gas that forms is evacuated by a gas vent (10). The residual conversion coal is collected in the conversion coal collector (4) and is partially returned to the mixing vat (3) via a screw conveyor (6) in the internal tube (5).

Abstract: The invention relates to a sand catcher comprising a deposition chamber (1) that is configured as a steel container with a cylindrical cross-section, traversed in a longitudinal direction. Said deposition chamber comprises air-supply nozzles (4) on one longitudinal side for generating a circulatory motion or the water transversally to the longitudinal direction of the deposition chamber (1) and a sand collection channel (3), located in the lower section, that runs in a longitudinal direction. A waste water inlet (6) for generating the circulatory motion of the water leads into the upper section of the deposition chamber (1), running transversally to said chamber. The air-supply nozzles (4) are provided on the side of the waste water inlet (6) below the latter (6).