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Title: Fluidized bed calciner apparatus

An apparatus for remotely calcining a slurry or solution feed stream of toxic or hazardous material, such as ammonium diurante slurry or uranyl nitrate solution, is disclosed. The calcining apparatus includes a vertical substantially cylindrical inner shell disposed in a vertical substantially cylindrical outer shell, in which inner shell is disposed a fluidized bed comprising the feed stream material to be calcined and spherical beads to aid in heat transfer. Extending through the outer and inner shells is a feed nozzle for delivering feed material or a cleaning chemical to the beads. Disposed in and extending across the lower portion of the inner shell and upstream of the fluidized bed is a support member for supporting the fluidized bed, the support member having uniform slots for directing uniform gas flow to the fluidized bed from a fluidizing gas orifice disposed upstream of the support member. Disposed in the lower portion of the inner shell are a plurality of internal electric resistance heaters for heating the fluidized bed. Disposed circumferentially about the outside length of the inner shell are a plurality of external heaters for heating the inner shell thereby heating the fluidized bed. Further, connected to the internal and externalmore » heaters is a means for maintaining the fluidized bed temperature to within plus or minus approximately 25.degree. C. of a predetermined bed temperature. Disposed about the external heaters is the outer shell for providing radiative heat reflection back to the inner shell.« less
Authors:
 [1] ;  [2] ;  [2]
  1. (West Richland, WA)
  2. (Richland, WA)
Publication Date:
OSTI Identifier:
866638
Report Number(s):
US 4755138
DOE Contract Number:
AC06-76FF02170
Resource Type:
Patent
Research Org:
WESTINGHOUSE HANFORD CO
Country of Publication:
United States
Language:
English
Subject:
fluidized; bed; calciner; apparatus; remotely; calcining; slurry; solution; feed; stream; toxic; hazardous; material; ammonium; diurante; uranyl; nitrate; disclosed; vertical; substantially; cylindrical; inner; shell; disposed; outer; comprising; calcined; spherical; beads; heat; transfer; extending; shells; nozzle; delivering; cleaning; chemical; portion; upstream; support; supporting; uniform; slots; directing; gas; flow; fluidizing; orifice; plurality; internal; electric; resistance; heaters; heating; circumferentially; outside; length; external; connected; means; maintaining; temperature; plus; minus; approximately; 25; degree; predetermined; providing; radiative; reflection; radiative heat; bed temperature; nitrate solution; uranyl nitrate; external heat; fluidizing gas; cylindrical outer; hazardous material; inner shell; outer shell; feed material; gas flow; fluidized bed; heat transfer; feed stream; substantially cylindrical; spherical beads; electric resistance; solution feed; cylindrical inner; disposed circumferentially; feed nozzle; resistance heat; resistance heater; /432/110/976/