A dedusting apparatus is provided with movable inlet deflectors that are positionally controlled by actuators to vary the rate of flow of particulate material over the wash decks. The inlet deflectors are formed with a fixed member that extends between the front and rear walls of the dedusting apparatus and extends downwardly from the top wall to terminate in a spaced relationship to the surface of the wash decks. A movable member is operatively coupled to an actuator to overlie the fixed member and be movable to be adjacent the surface of the wash deck to terminate flow of material past the deflectors. Particulate material can accumulate above the wash decks and between the deflectors to fill the volume to the inlet opening to permit a full loading of flow over the full width of the wash decks when the deflectors are raised by the actuators.

A dedusting apparatus is provided with movable inlet deflectors that are positionally controlled by actuators to vary the rate of flow of particulate material over the wash decks. The inlet deflectors are formed with a fixed member that extends between the front and rear walls of the dedusting apparatus and extends downwardly from the top wall to terminate in a spaced relationship to the surface of the wash decks. A movable member is operatively coupled to an actuator to overlie the fixed member and be movable to be adjacent the surface of the wash deck to terminate flow of material past the deflectors. Particulate material can accumulate above the wash decks and between the deflectors to fill the volume to the inlet opening to permit a full loading of flow over the full width of the wash decks when the deflectors are raised by the actuators.

Fine particulate material is separated from a mixture of coarse particulate material and fine particulate material by passing sweep gas through the chamber of a rotating tumbler drum that contains an introduced material that is a mixture of coarse particulate material and fine particulate material. In particular, polysilicon powder may be separated from granular polysilicon. Seals are present, at locations where gas-conveying parts of the apparatus move relative to one another, to block the escape of sweep gas to the atmosphere surrounding the apparatus. A downstream seal extends between a stationary exhaust duct and an exhaust tube that rotates with the tumbler drum. The seal is protected by a flow of clean flush gas that is delivered to a gap between the exhaust duct and the exhaust tube.

A device for separating and recovering flat-plate catalyst powder and a method for determining a wear ratio are provided. The device includes a powder separation unit and a powder recovery unit, a powder accumulation bin is respectively connected with a shell and a catalyst powder outlet, a cyclone outlet is configured on an inner side of a recovery shell, and a primary filter and a secondary filter are configured on an inner side wall of the recovery shell.

A device for separating and recovering flat-plate catalyst powder and a method for determining a wear ratio are provided. The device includes a powder separation unit and a powder recovery unit, a powder accumulation bin is respectively connected with a shell and a catalyst powder outlet, a cyclone outlet is configured on an inner side of a recovery shell, and a primary filter and a secondary filter are configured on an inner side wall of the recovery shell.

A passive food screen device (1) for flour in a delivery flow comprising: a housing (2) with a housing inlet (3) and a housing outlet (4); a closed screen insert (5) arranged substantially within the housing (2) such that a spatial area (6) is formed between the inner wall (7) of the housing (2) and the outer wall (8) of the screen insert (5) and screen elements (9) of the screen insert (5) are arranged substantially parallel to the main conveying direction (F); and a hose coupling (10) on the housing inlet (3) and/or on the housing outlet (4). The food screen device allows a high delivery capacity, and, by virtue of its narrow design, can be carried on a silo vehicle and used as a control screen when delivering flour. The food screen device (1) is designed such that the flour can be moved in an air delivery stream.

A passive food screen device (1) for flour in a delivery flow comprising: a housing (2) with a housing inlet (3) and a housing outlet (4); a closed screen insert (5) arranged substantially within the housing (2) such that a spatial area (6) is formed between the inner wall (7) of the housing (2) and the outer wall (8) of the screen insert (5) and screen elements (9) of the screen insert (5) are arranged substantially parallel to the main conveying direction (F); and a hose coupling (10) on the housing inlet (3) and/or on the housing outlet (4). The food screen device allows a high delivery capacity, and, by virtue of its narrow design, can be carried on a silo vehicle and used as a control screen when delivering flour. The food screen device (1) is designed such that the flour can be moved in an air delivery stream.

A sieving apparatus for fractionating a grain product comprises a top chamber separated from a bottom chamber by a sieve; a top chamber cover defined by a plurality of openings that allow substantially vertical entry of an air stream into the top chamber when the interior of the sieving apparatus is under vacuum via first exit port in a side wall of the bottom chamber for exit of air; an inlet port in a sidewall of the top chamber, the inlet port configured for feeding of dry grain particles into the top chamber and for substantially horizontal entry of air into the top chamber; and a first exit port in a sidewall of the bottom chamber for exit of air and exit of a first grain fraction from the bottom chamber when the interior of the sieving apparatus is under vacuum via the exit port.

A device for retaining and removing filaments of plastic material, or angel's hairs, from a flow of plastic material in form of granules, powders or flakes is disclosed. The device includes a main body defining a through channel through which the plastic material flows, a plurality of retractable elements carried by the main body and are movable between a retracted position, in which they leave the through channel unobstructed, and an extracted position, in which they protrude into the through channel for trapping the angel's hairs flowing together with the flow of plastic material along the through channel, and an actuating system for moving each retractable element between the retracted and extracted positions.

A granulate production device and methods for open-loop and/or closed-loop control of the granulate production device. The granulate production device includes a granulator, a screening device connected to the granulator via a granulate feed line, a processing apparatus which is connected to a screen product chamber of the screening device via a granulate transfer line, and a measuring device which is suitable for detecting a physical parameter of a transfer gas. The transfer gas can be conveyed by a conveyor device arrangement on a transfer gas conveyor path extending from a feed line inlet to a transfer line outlet. The measuring device is suitable for detecting a physical parameter of the transfer gas selected from flow rate, mass flow, and flow velocity on the transfer gas conveyor path.