GB562345A - Improvements in methods and devices for washing gases - Google Patents

Abstract

562,345. Spray producers. LINDEROTH, E. T. Feb. 9, 1943, No. 2162. Convention date, Feb. 10, 1942. [Class 69 (iii)] [Also in Group II] Several centrifugal machines are described, for removing dust particles from gas, and operate by the method of driving the dust-laden current b (see Fig. 1) against a series of guiding surfaces 2 on a rotor so that thin layers of gas are sharply deflected and dust particles flung centrifugally against the surfaces 2, the faces of which are moistened. The ratio of the gas velocity of entry into the rotor w1 to the peripheral velocity of the rotor w2 is very small, the relative velocity wr being high. In Figs. 7 and 8 a perforated drum 3 in a spiralshaped casing 4 rotates at high speed, the unclean gas entering through a pipe 6 and clean gas passing up a diffuser 7. The gas velocity in the casing 4 varies from 7 per cent to over 100 per cent of the rotor peripheral velocity. Equations for calculating the various gas velocities in the machine in accordance with the dimensions R1, R2, the diffuser angle, &c., are given in the Specification. The energy contained in the gas passing through an outlet 17 may be utilized for outside work. Liquid from a sprayer 8 after wetting the vanes is separated by a screen 9 and re-enters a reservoir 11 supplied by a pipe 14 under control of a float valve 15. A strainer 13 and a drain cock are provided. To prevent the overflow of uncleaned gas into the cleaned gas, an annular slot 19 allows a stream of outer air to enter, or a fan may blow cleaned gas through the slot 19 into the casing. Figs. 11 and 12 show an arrangement wherein gas enters an inlet 32 and passes out through a diffuser 33. Washing liquid drains through slots 34, 35 into a reservoir 36, being guided by strips 39. The spray 40b is generated by air pressure in the reservoir and the shape of the ejectors 40, 41. A strainer 42 is used. The liquid may be heated or cooled by means of a coil 44, and the gas in the inlet 32 heated by a medium circulating through a jacket 45. A further arrangement is described wherein the gas flows from the outside of a volute-shaped casing into the rotor chamber, and is led axially to an outlet diffuser. Axially-arranged sprays play on the outside of the rotor. Figs. 15 and 16 show a further arrangement in which the rotor rotates against the flow of gas entering an inlet 63 at the side of the rotor chamber. The spray is formed by a series of nozzles 66, Fig. 15a, such that the gas may be cooled below its dew point. The film of liquid moves obliquely into the gas current. Drainage slots 67 for the liquid are provided. The liquid may be pumped through a cooler 70. In another arrangement, the rotor has concentric rings of vanes, the gas passes radially inwards through the rings, and is delivered axially to an outlet. In passing through the inner ring, the gas assists in driving the rotor. Axial spray tubes for liquid, are arranged inside and outside the rings of vanes.