Patent GB-1320164-A (GB)
Title: Method of treating gas phase materials
IPC: B01D45/14
Filed: 1970-05-21
Abstract: 1320164 Centrifugal separation; gas scrubber G PETERSEN 21 May 1970 [24 May 1969 19 Feb 1970] 24706/70 Headings B2P and B1R Suspended solid and/or liquid particles are separated from a gaseous phase material, or a gaseous component of the gaseous phase material is absorbed in a liquid phase absorbent injected in the gaseous phase material in finely divided form, by causing the gaseous phase material to flow through a rotating chamber in a radially inward direction from the periphery towards the axis of rotation of the chamber so that the particles are separated out, or the gaseous component is absorbed in the liquid absorbent, under the action of centrifugal force acting opposite to the directions of flow of the gaseous material. In Figs. 1 and 2, a centrifuge motor, consisting of chambers 2 delimited by disc-like boundary walls 3 and radial partition walls 4, is mounted on a drive shaft 1 for rotation in a spiral housing 7 provided with a tangential inlet 6 for gas containing impurities and an outlet 8 for cleaned gas. A blower may be provided at the inlet or outlet to blow in or suck out the gas. At the outer edge of the chambers 2 are arranged perforated or slotted plates 5 arranged in a circle and entrainment vanes 12. A wire net may be substituted for the plates 5. The chambers 2 may alternatively be filled with nets or mats made of wires or cords. Liquid is sprayed into the gas inlet through a nozzle 10 and, as it passes through the plates 5, it is atomised in a fine mist. The vanes 12 serve to bring the gas-liquid mixture to the speed of the rotating chambers 2. In the chambers 2 due to centrifugal force the mist and impurities agglomerate and are separated out. A gland 11 and a liquid seal 9 prevent the gas from escaping. In a modification, Fig. 3 (not shown), the perforated plates 5 are dispensed with and the partition walls 4 defining each chamber are parallel and non- radial, being inclined forwardly in the direction of rotation which is opposed to the direction of entry of the gas. The liquid injected into the inlet is in this case atomised by the entrainment vanes 12. In a further modification Fig. 4 (not shown), the liquid is injected through the drive shaft and through radial pipes depending therefrom and opening into the chambers. In Figs. 5 and 6, the partition walls 4 are curved forwardly in the direction of rotation and entrainment fingers 13 at the outer end of the chambers 2 dip into a pool of liquid 15 to provide a spray thereof in the housing 7. In Fig. 7, a blower 16 is mounted on the drive shaft 1 upstream of the chambers 2. Alternatively, the blower is mounted downstream of the chambers. In a modification, the disc-like boundary wall 3 on the gas outlet side may be omitted. In Figs. 8 and 9, the liquid is injected through a nozzle 10 and vanes 17 provide for acceleration of the injected liquid to the speed of the rotating chambers. Separated liquid and impurities leave the housing 7 through a pipe 21. The acceleration vanes 17 may be curved. Alternatively, the vanes may not be attached directly to the periphery of the gas outlet 8 but may be displaced radially outwards; they may be straight and inclined rearwardly or forwardly. The partition walls 4 may not extend to the outer periphery of the rotor. In Fig. 13, curved entrainment vanes are provided at 12 and curved acceleration vanes at 17. The walls 4 are curved and do not extend to the periphery of the outlet 8. In a modification of this figure, the walls 4 are dispensed with so that a single chamber 2 is provided in the rotor. In a further modification, the walls 4 and the vanes 17 are dispensed with. In a still further modification, the walls 4 are dispensed with and the vanes 12 and 17 are straight and staggered. In Fig. 17, liquid is fed by a pipe 22 to a fan wheel 19 connected to spray nozzles 14. Concentric rings 18 at the gas outlet side of the rotor secure and support entrainment and acceleration vanes 12, 17 respectively. A cyclone is provided at 20 for separation of entrained liquid droplets.