Helical duct gas/meal separator

Details Helical duct gas/meal separator Helical duct gas/meal separator

1981-01-02

1982-03-09

Camby, John J.

Heating

With heating gas conveying, agitating, scattering or...

432106, F27B 1500, F27B 702

Patent

active

043186920

ABSTRACT:
A helical duct separator particularly suited for use in the suspension preheater of a cement calcining plant to separate raw cement meal from kiln-off gases in which the meal is suspended comprises a hollow elongated continuous duct having its longitudinal axis disposed along a downwardly inclined helical path, an inlet opening in a vertical plane for receiving a horizontal stream of gas with entrained meal, a downwardly inclined upper wall and a concave outer sidewall in the path of the gas stream to deflect the gas stream into a downwardly inclined helical path, a horizontal bottom wall adjacent the outlet end of the duct, a meal exit opening in the bottom wall and a gas exhaust opening in a horizontal plane in the upper wall adjacent the outlet end of the duct. The gas stream so directed in a downwardly inclined helical path impinges on the horizontal bottom wall and is deflected upward and drawn upward by suction from an induced draft fan toward the gas exhaust opening while the heavier meal is precipitated from the gas stream and urged by centrifugal and inertial forces to flow along the bottom wall and through the meal exit opening. The helical duct separator is substantially shorter in height, and has a substantially lower pressure drop, than a cyclone separator, thereby permitting reduction in the height of, and the energy required to operate, a suspension preheater in comparison to one of the cyclone separator type.

REFERENCES:
patent: 3836323 (1974-09-01), Engel
patent: 4119396 (1978-10-01), Abelitis et al.

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