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Title: Fluidized bed calciner apparatus

Abstract

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

Inventors:
 [1];  [2];  [2]
  1. (West Richland, WA)
  2. (Richland, WA)
Publication Date:
Research Org.:
WESTINGHOUSE HANFORD CO
OSTI Identifier:
866638
Patent Number(s):
US 4755138
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:
AC06-76FF02170
Resource Type:
Patent
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/

Citation Formats

Owen, Thomas J., Klem, Jr., Michael J., and Cash, Robert J. Fluidized bed calciner apparatus. United States: N. p., 1988. Web.
Owen, Thomas J., Klem, Jr., Michael J., & Cash, Robert J. Fluidized bed calciner apparatus. United States.
Owen, Thomas J., Klem, Jr., Michael J., and Cash, Robert J. 1988. "Fluidized bed calciner apparatus". United States. doi:. https://www.osti.gov/servlets/purl/866638.
@article{osti_866638,
title = {Fluidized bed calciner apparatus},
author = {Owen, Thomas J. and Klem, Jr., Michael J. and Cash, Robert J.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1988,
month = 1
}

Patent:

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  • A fluidized bed calciner is described including a shell, a fluidized bed disposed in the shell, a fluidized bed support member disposed in the shell, the support member in communication with the fluidized bed for supporting the fluidized bed. The support member has substantially rectangularly shaped slots for providing means for uniform fluidization, comprising: (a) parallel first channels traversing the top surface of the support member without interruption from one edge to the other edge thereof; and (b) parallel second channels disposed perpendicularly to the first channels and traversing the bottom surface of the support member without interruption from onemore » edge to the other edge thereof, the first channels and the second channels forming a checkerboard lattice through which the fluidizing gas passes.« less
  • This patent describes a fluidized bed calciner operating with a coal fired boiler comprising: a fluidized bed combustion chamber wherein coal is burned and hot flue gases and lime are produced; a first fluidized lime cooler bed adjacent the combustion chamber including means for receiving lime produced in the combustion chamber and means for supplying air to fluidize the fluidized bed combustion chamber; a second fluidized lime cooler bed adjacent the first fluidized lime cooler bed including means for receiving lime from the first fluidized lime cooler bed and means for supplying air to fluidize the first fluidized lime coolermore » bed; a windbox adjacent the second fluidized lime cooler bed for supplying air to fluidize the second fluidized lime cooler bed; air supply means for supplying air to the windbox; bypass means for selectively circulating a portion of the air from the air supply means to fluidize the first fluidized lime cooler bed. The bypass means has steam coil heating means for selectively heating the air supplied to the first fluidized lime cooler bed; first-removal means for removing lime from the second fluidized lime cooler bed; and, second removal means for separately removing combustion by-products from the fluidized bed combustion chamber.« less
  • A nozzle employed as a burner within a fluidized bed is coaxially enclosed within a tubular shroud that extends beyond the nozzle length into the fluidized bed. The open-ended shroud portion beyond the nozzle end provides an antechamber for mixture and combustion of atomized fuel with an oxygen-containing gas. The arrangement provides improved combustion efficiency and excludes bed particles from the high-velocity, high-temperature portions of the flame to reduce particle attrition.
  • A nozzle employed as a burner within a fluidized bed is coaxially enclosed within a tubular shroud that extends beyond the nozzle length into the fluidized bed. The open-ended shroud portion beyond the nozzle end provides an antechamber for mixture and combustion of atomized fuel with an oxygen-containing gas. The arrangement provides improved combustion efficiency and excludes bed particles from the high-velocity, high-temperature portions of the flame to reduce particle attrition. 4 claims, 2 figures.
  • This patent describes an apparatus for providing a fluidized bed to effect a separation of a mixture of articles having at least a first density and a second density that is greater than the first density into separate groups. It comprises an inclined channelization means having input and output ends and otherwise enclosed along the length of the sides and bottom thereof; medium feed means for supplying to the input end of the channelization means a fluidization medium from which to create the fluidized bed in the channelization means; pneumatic means for forcing gas upwardly through the fluidization medium inmore » the channelization means to create from the fluidization medium a fluidized bed; and vertical oscillation means for uniformly imparting to the entire inclined channelization means essentially only a vertical oscillatory movement of selected frequency so that there is no significant horizontal movement imparted to the fluidized bed.« less