Patent GB-937549-A (GB)
Title: Improvements in cyclonic fluid separators
Inventor: MORNS JAMES GREENWELL
IPC: B04C5/00
Filed: 1961-08-29
Abstract: 937,549. Cyclone separators. CLARKE, CHAPMAN & CO. Ltd. Aug. 21, 1962 [Aug. 29, 1961; April 11, 1962], Nos. 31106/61 and 13985/62. Class 23. In a cyclone separator for separating solid or liquid particles from a gas stream and comprising a cylindrical casing 1, Fig. 1, into which the particle-laden gas is introduced tangentially, Fig. 3, or spirally, Fig. 5, and from which the cleaned gas and the separated particles are discharged respectively at the top and bottom, the entry duct 2, which is of rectangular section, is helically disposed about the axis of the casing and is fully enclosed, from the radius at which its inner wall 4 (Fig. 5) or outer wall 3 (Fig. 3) merges tangentially into the casing, for substantially 180 degrees about the casing axis, its upper and lower walls 5, 6 thereafter continuing helically within the casing. In Fig. 3 the inner wall 4 extends inside the casing for 180 dgrees from the plane A-A at which the outer wall merges tangentially with the casing 1. In Fig. 5 the inner wall 4 is tangential to the casing at plane A-A and continues as a spiral portion 17 within the casing to the opposite plane B-B whereas the outer wall 3 extends between the two planes as an external spiral portion which merges tangentially with the easing at the plane B-B. In both figures, the upper and lower walls 5, 6, after their first 180 degrees portion from the plane A-A, form inside the cavity an inwardly open helical channel the base of which is constituted by the casing. When treating wet steam, the upper part of the casing may be provided with a pad of wire mesh fabric 12 which retains the last traces of water remaining in the steam. A plate or disc 10 is suspended from the lower end of the casing for supporting a water vortex inside the casing independently of the level of the water outside it so that the separated water issues through the gap 11 tangentially and nearly horizontally thereby preventing water external to the casing from entering the bottom of the casing and minimizing re-entrainment of steam in the separated water. In Fig. 6, the inlet branches 2 of a number of separators 1 disposed in one or two horizontal ranks are respectively connected to one vertical portion 15 or opposite vertical portions of a polygonal baffle 14 longitudinally extending inside a steamwater drum 13 of a steam generator. Steamwater mixture entering the drum from evaporator tubes led into the drum wall is thus caused to flow through the separators, the separated water returning to the water in the drum and the saturated steam passes out towards dryers 16 before being directed to the superheater section of the generator. In Figs. 7 and 8, a number of separators, are spaced around an inlet duct 48 to form a unitary assembly. The inlet duct 32 of each separator does not protrude beyond its casing 31, its outer wall being constituted only by the casing wall. The duct 48 opens into the top or, as shown, the bottom of an enclosure 40 bounded by the portions 41 of the casings 31, vertical plates 42 between the casings (these being omitted if the casings are in mutual contact) and upper and lower plates 43, 45. The assembly may be used in conjunction with a nuclear reactor for producing steam. Specification 937,549 is referred to.