GB709476A - Improvements in or relating to electrostatic precipitators - Google Patents

Abstract

709,476. Electrostatic precipitation. POWER JETS (RESEARCH & DEVELOPMENT), Ltd. Dec. 31, 1951 [Jan. 5, 1951], No. 459/51. Class 39(1) An electrostatic gas cleaner of the type in which gas-borne particles are deposited on a wetted collecting surface under the action of an electrostatic field, comprises a tube, the axis of which is inclined to the vertical, preferably at a small angle to the horizontal, and through which the gas to be cleaned is passed, the outer surface of the tube being immersed in a liquid and the tube wall being of liquid-pervious material through which the liquid percolates to wet the inner surface of the tube, which constitutes the collecting surface. In the construction shown in Fig. 1 the tube 1 is mounted at a small angle to the horizontal and comprises an inner wall 2 of liquid-pervious material, e.g. concrete or unglazed earthenware, and an outer impervious wall 3 and is formed with end flanges 4, 5 connected to inlet and outlet ducts 6, 7. A tensioned wire 8 and insulators 9, 10 are mounted coaxially within the tube by the spiders 11, 12, one end of the wire being connected to a H.T. supply by a lead 13 carried by an insulator 14. The inner wall 2 is earthed. The space 15 between the inner and outer walls 2 and 3 is sup-. plied with distilled water from a circulation system comprising a tank 16, filter 17, pump 18; tube 19 and drain 20 which is made of metal and earthed. In the construction shown in Figs. 2 and 3 the cleaner comprises nine elements mounted in a box divided into three compartments one above the other by impervious walls 31. Each element comprises a liquid-pervious tube 32 and an impervious tube 33 in abutting relation therewith, the tubes being formed with flanges 34, 35 36, 37 which are square in end elevation. Within and coaxial with each tube 32 is mounted a gas-pervious tubular metallic screen 38 of wire gauze, the upper end of which is connected to a non-conducting diffuser 39 and the lower end of which is attached to a stream-lined, non-conducting fairing 40 at the apex of which is mounted an insulator 41 carried by a spider 42. Tensioned wires 43 are attached to the insulators 41 and are connected to a metallic frame 44 carried on insulators 45 and connected to a H.T. supply. The screens 38 are connected by leads 46 to a metallic frame 47 carried on insulators 48 and connected to a H.T. supply. The tubes and body of the cleaner are maintained at earth potential. The space 49 surrounding each of the tubes 32 is kept supplied with liquid through a pipe 50 and perforations in the flanges 37, 36 and 35. The same head of liquid is maintained in each layer of tubes by adjusting valves 51. Gutters 52 and drain pipe 53 are provided. If desired a liquid circulation system as in Fig. 1 can be used. In the construction shown in Fig. 4 the tubes 32 and the gas-pervious screens 38 are hexagonal in crosssection, the tubes being spaced apart by strips 54. Specification 698,874 is referred to.