Fluidized bed calciner apparatus
- West Richland, WA
- Richland, WA
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 external 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.
- Research Organization:
- WESTINGHOUSE HANFORD CO
- DOE Contract Number:
- AC06-76FF02170
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4755138
- OSTI ID:
- 866638
- Country of Publication:
- United States
- Language:
- English
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25
ammonium
apparatus
approximately
beads
bed
bed temperature
calcined
calciner
calcining
chemical
circumferentially
cleaning
comprising
connected
cylindrical
cylindrical inner
cylindrical outer
degree
delivering
directing
disclosed
disposed
disposed circumferentially
diurante
electric
electric resistance
extending
external
external heat
feed
feed material
feed nozzle
feed stream
flow
fluidized
fluidized bed
fluidizing
fluidizing gas
gas
gas flow
hazardous
hazardous material
heat
heat transfer
heaters
heating
inner
inner shell
internal
length
maintaining
material
means
minus
nitrate
nitrate solution
nozzle
orifice
outer
outer shell
outside
plurality
plus
portion
predetermined
providing
radiative
radiative heat
reflection
remotely
resistance
resistance heat
resistance heater
shell
shells
slots
slurry
solution
solution feed
spherical
spherical beads
stream
substantially
substantially cylindrical
support
supporting
temperature
toxic
transfer
uniform
upstream
uranyl
uranyl nitrate
vertical