High temperature rotating vacuum kiln for heat treating solid particulate material under a vacuum
AssigneeCabot Corporation
InventorAllan C. Morgan
Life of this patent
Estimating the term…
Abstract
A rotating vacuum kiln for heat treating solid particulate material under vacuum conditions uses a rotating refractory metal cylindrical vessel with a cool inlet zone, hot intermediate zone, and cool exit zone, with a first series of inner radiation shields provided at the hot intermediate zone adjacent to the cool inlet zone and a second series of inner radiation shields provided at the hot intermediate zone adjacent the cool exit zone to protect those two zones from the high temperatures in the hot intermediate zone. Heat for the hot intermediate zone of the cylindrical vessel is provided indirectly by electrical resistance heaters that surround the vessel and outer radiation shields are provided about the heaters to direct heat to the cylindrical vessel.
Claims16
A rotating vacuum kiln comprising:
- a rotating refractory metal cylindrical vessel having inner and outer walls, a cool inlet zone, a hot intermediate zone and a cool exit zone;
- means for charging solid particulate material for heating into said cool inlet zone while under a vacuum;
- means for discharging said solid particulate material after heating from said cool exit zone while under a vacuum;
- means for moving the solid particulate material in a direction from the charging means to the discharging means;
- a first series of inner radiation shields in the cylindrical vessel at said hot intermediate zone, adjacent to said cool inlet zone, and a second series of inner radiation shields at said hot intermediate zone adjacent to said cool exit zone;
- a gaseous exhaust conduit extending into said cool exit zone and at least partially into said hot intermediate zone for removing gases and vaporized material therefrom;
- means for indirectly heating said hot intermediate zone;
- and
- radiation shields surrounding the rotating refractory metal cylindrical vessel along said hot intermediate zone.
A rotating vacuum kiln comprising:
- a rotating refractory metal cylindrical vessel having inner and outer walls, a cool inlet zone, a hot intermediate zone and a cool exit zone;
- means for charging solid particulate material for heating into said cool inlet zone while under a vacuum;
- means discharging said solid particulate material after heating from said cool exit zone while under a vacuum;
- a first series of inner radiation shields attached to the inner wall of the cylindrical vessel, at said hot intermediate zone, adjacent to said cool inlet zone;
- a second series of inner radiation shields positioned in the cylindrical vessel at said hot intermediate zone, adjacent to said cool exit zone;
- a series of screw flights attached to the inner wall of the cylindrical vessel adapted to move solid particulate material in a direction from the charging means to said discharging means;
- a gaseous exhaust conduit extending into said cool exit zone and at least partially into said hot intermediate zone for removing gases and vaporized material therefrom;
- electrical resistance heaters spaced from and about the outer wall of said cylindrical vessel along the hot intermediate zone;
- and
- a plurality of outer radiation shields which are spaced from each other and spaced from, surround and radially enclose said electrical resistance heaters.
Dependencies are inferred from the claim text.