| 摘要 |
1500065 Gas/liquid contact apparatus ALFA-LAVAL AB 1 July 1975 [8 July 1974 9 Sept 1974] 27713/75 Headings B1F and BIR Apparatus for treating a gas with a liquid comprises a housing 1 defining a vertical channel 2 for flow of gas upwardly therethrough, means for producing and supplying foam containing the liquid via inlet tube 9, gas-permeable, foam-supporting elements 3, 4 vertically spaced in the channel, and constructed to cause turbulence in the channel and also allow foam to be carried by the gas from the space defined between the elements up through the upper element and a tubular body 6 extending below the upper element and defining with housing 1 an annular passage 8 which is shielded from the upward flow of gas therethrough by the deflection of the lower portion of 6 towards the housing 1, but which allows foam to descend from above the upper element to the space between the elements. A flap valve in the form of a rubber skirt 6a additionally prevents upward passage of gas through 8. At intervals, liquid is sprayed on to the lower element from nozzle 17 to prevent clogging. The height of the foam layer is controlled by sensing means 13, 14, unit 15 and valve 10 acting on foam delivery pipe 9. A further gas-permeable, foam-supporting element may also be provided.
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