| 摘要 |
<p>976,801. Drying air; evaporating solutions. C. G. MUNTERS. Dec. 22, 1960 [Dec. 23, 1959], No. 44060/60. Headings B1B and BIL. Air is dried by passing it up through the channels of a contact body 16 in a casing 14, while a solution of a hygroscopic salt, such as lithium chloride or bromide, flows down over the surfaces of the contact body. The air is drawn at the sides of the lower part of the casing by means of a fan 28. The contact body is made up of parallel sheets of water-absorbent material (e.g. cellulose or asbestos, impregnated with phenolic resin), the sheets being corrugated, and interconnected along the ridges of the corrugations. The hygroscopic solution is distributed over the top face of the contact body by a rotating arm 36 which has apertures 38. The arm slowly rotates due to the reactionforce produced as the liquid is sprayed from the apertures. The dried air is withdrawn through duct 30. The solution drips off the lower ends of the contact sheets into tray 40, and is collected in basin 42. This solution has now to be re-concentrated by evaporation of some of the water; and this is achieved in regenerator 12, which also contains a contact body 20, similar to that in the drying-section 14. The solution is supplied, via conduit 54, to sprayer-arm 44 which is slowly moved, by motor 46, over contact body 20 ; and the solution is distributed over the sheets from the apertures 50 in the bottom of the arm. Gas, which is heated by burner 82, is blown through conduit 80 ; and the hot gas rises through the channels between the sheets of the contact body, evaporating water from the solution flowing down the sheets as a thin film. Those sheets which are being momentarily supplied with solution are shut off from the current of hot gas ; for the arm 44 and its attached baffles 52 close the top of the feed-channels. Most of the liquid supplied through arm 44 flows off the sheets before the hot gas comes into contact with it, and at the same time flushes down the concentrated solution and any precipitated salt formed in the previous evaporation period. The concentrated solution is collected in tray 70. This solution is mixed, in conduit 62, with the solution withdrawn from the air-dryer. From the conduit 62 a major part of the liquid is passed through conduit 34 to the air-dryer, while the remainder is passed to the regenerator. The heat supplied to the solution during its regeneration may be recovered in heat-exchanger 64. The hot gas, leaving the top of the regenerator through conduit 84, may be recirculated through conduit 85 ; fresh air being introduced through conduit 86 in order to maintain the combustion in burner 82. Specifications 837,601 and 890,790 are referred to.</p> |
