Patent GB-1000183-A (GB)
Title: Method of, and apparatus for, purifying gases charged with solid particles
IPC: B04C5/14
Filed: 1962-05-04
Abstract: 1,000,183. Centrifugal separators. E. P. BURION. May 4, 1962 [May 9, 1961], No. 17281/62. Heading B2P. Gases charged with solid particles are purified by causing the gases to follow successively at least two upright trajectories of successively opposite directions in at least one annular channel and in a cylindrical channel, each channel having a substantially constant area, causing the gases to follow a helical path in one of the channels thereby subjecting the gases to a centrifugal separating action, and causing the whole flow of the particles to be disturbed in at least one of the channels over substantially the length thereof so as to cause particles to be separated from the gases. In Fig. 1 the enclosure is formed between an outer cover 30, connected by a cone 31 to a smoke-stack 32, and a receptacle 36 terminated by a hopper 37 communicating by a tube 38 to a discharge pipe 39. Particle-laden fumes from the smoke-stack are whirled by helical vanes 35a at the entrance to the enclosure. The separated particles are removed through a vertical slot 41 (which acts as the disturbing means) in the cover 30 and pass via a collector 40 into the discharge pipe 39. The substantially particle-free fumes escaping from the chamber are reversed in axial direction by a lid 33 and pass through further helical vanes 35 into the receptacle 36 where the remaining particles are separated. The clean fumes escape into the atmosphere through a central duct 34 which is surrounded by a static exhauster 42 to facilitate the draught. In Figs. 3 and 4 the enclosure is subdivided into two chambers 53, 54 bounded by partitions 50, 51 extending respectively over the whole and approximately half the height of the enclosure. The particle-laden fumes entering through apertures 49 pass successively through the chamber 53 and, over the partition 51, through the chamber 54 where most of the particles escape through a slot 56 and the fumes together with the remaining particles pass through slots 45, 46 into the interior of the receptacle 44. Apertures 47 are provided at the bottom of the enclosure for the evacuation of any particles which have fallen by gravity after separation in the enclosure. The central exhaust duct 58 for the clean fumes has a corrugated wall offering an impact surface to the particles and thus facilitating their separation. In Fig. 8 particle-laden gases enter the enclosure through a tangential inlet 61. The inner wall of the enclosure comprises two segmental portions 62, 62a made of corrugated steel sheeting to provide impact surfaces. Slots 65, 66 are provided for the flow of the substantially particle-free gases. In another embodiment, the enclosure is formed between a vertical gas exhaust duct and an outer cover having a vertical slot in its wall communicating with a side collector for the particles. The gases enter the enclosure tangentially or axially and are whirled by vanes located at the top of the enclosure, propeller-like helical blading being provided on the outside of the central duct to aid the whirling movement of the gases.