Patent GB-947180-A (GB)
Title: Improvements in or relating to apparatus for separating a constituent from a stream of material
IPC: B04C9/00
Filed: 1960-04-28
Abstract: 947,180. Centrifugal separators. SIEMENS SCHUCKERTWERKE A.G. April 28, 1960 [April 28, 1959], No. 14987/60. Addition to 933,224. Heading B2P. In a separator for removing dust from gases, partial separation of the dust particles is effected in a casing 1, Fig. 1a, and the partially cleaned gases then pass axially into a tube 5 having ducts 6, 7 injecting air obliquely and tangentially into the tube, or stirring means arranged to rotate about the tube axis, for producing a potential flow whereby final separation of the dust particles takes place in the manner described in the parent Specification. The dustladen gases enter the casing 1 tangentially at 4, the cleaned gas leaves at 9 and the coarse dust particles are removed at 3 while the fine particles accumulate around a member 10 and are removed at 8. In modifications, the tube 5 extends within the casing 1 and the gases enter horizontally through a spiral inlet or axially through tangentially-directed vanes, the member 10 being omitted. Secondary air may be injected through nozzles 19 to aid in the centrifugal operation. In a further modification, a second member 10 is disposed in the tube 5 between the ducts 6 and 7 which are further spaced apart, a second dust discharge duct being provided at the side of the second member. In Fig. 7a, the fine dust particles are redirected to the casing 1 through a pipe 8 opening tangentially or at an angle into the inlet 4 which may be provided with nozzle 14. In a modification, the pipe 8 opens into the casing 1 above or below the inlet 4. In a further modification, the tube 5 may be extended and a ring of vanes disposed around it below the inlet 4, the fine particles being returned as in Fig. 7a or through ducts or passages around the member 10 opening inside the casing 1 above the ring of vanes. In Fig. 4, secondary air is injected tangentially or diagonally into the inlet 4, vanes 11 assist in whirling the gases and a body 61, which may also be incorporated in all the embodiments described, is located centrally in the tube 5 to stabilize the flow. In Fig. 10, a frustum-shaped member 15, which may be rotated to assist separation, is provided with a central aperture 16 for the passage of the gases into the tube 5. The fine dust particles are returned to the casing 1 through pipes 8 and/or ducts 17. In Fig. 12, members 20, 25 are provided, one of which is rotated. In a modification, the member 20 is eliminated. In Fig. 14, a member 29 is rotated by a motor 30 which also drives a vane ring 38 for effecting further separation of the dust particles before the partially cleaned gas passes into the tube 5. Coarse, medium and fine particles are separated as indicated by the arrows 32, 33, 35. A hollow frustum 34 is secured to the vane ring and acts as a seal. In Fig. 15 a tapered member 37 is rotated by a motor 32 in the casing 1. A stationary deflector 41 may be provided above the member 37 to intercept particles flowing spirally towards the axis of the separator. Auxiliary air may be injected by way of ducts 42 in the member 37. A number of separators may be connected in series.