FIELD: separation of catalyst particles from hydrocarbons after cranking. SUBSTANCE: cyclone cover has a hole and an outlet pipe passing through the hole. A ring flat member lies on the cover, and the diameter of its hole is less than the diameter of the hole in the cover. The hole has an anticorrosion facing and forms an annular exhaust nozzle between the protective facing and outlet pipe. EFFECT: considerable relative motion of vertically interconnected cyclones of the first and second stages. 7 cl, 1 dwg
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