| 摘要 |
Apparatus for injecting antifoulant solution into a hot gaseous process stream in a thermal cracking furnace tube to inhibit coke deposition includes an inner antifoulant supply tube having one end connected to a pressurized supply of antifoulant solution and an access port along the furnace tube and the other end connected to an inlet of a centrifugal, atomizing nozzle having an outlet for discharging the antifoulant solution as a spray of small drops. An outer tube extends in concentric, insulating relation along the antifoulant supply tube between the access port and the nozzle, A flow deflector has an apertured peripheral wall with a portion defining a tubular mixing and vaporizing chamber extends coaxially along the furnace tube and an axial inlet end mounted in registration with the nozzle outlet to receive all spray therefrom. An axial outlet end is radially enlarged so as to deflect the gaseous process stream through wall apertures into the chamber. All drops of antifoulant solution are vaporized and dispersed within the chamber without the antifoulant solution contacting the furnace tube wall so that only particulate antifoulant is entrained in the gas process stream. The chamber is conical or cylindrical and the wall portion is formed with lateral apertures for admitting deflected gas stream into the chamber. The conical shape can be formed by a series of axially displaced, coaxial, hollow cylindrical portions of progressively increasing diameter.
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