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Title: Staged fluidized-bed combustion and filter system

A staged fluidized-bed combustion and filter system for substantially reducing the quantity of waste through the complete combustion into ash-type solids and gaseous products. The device has two fluidized-bed portions, the first primarily as a combustor/pyrolyzer bed, and the second as a combustor/filter bed. The two portions each have internal baffles to define stages so that material moving therein as fluidized beds travel in an extended route through those stages. Fluidization and movement is achieved by the introduction of gases into each stage through a directional nozzle. Gases produced in the combustor/pyrolyzer bed are permitted to travel into corresponding stages of the combustor/filter bed through screen filters that permit gas flow but inhibit solids flow. Any catalyst used in the combustor/filter bed is recycled. The two beds share a common wall to minimize total volume of the system. A slightly modified embodiment can be used for hot gas desulfurization and sorbent regeneration. Either side-by-side rectangular beds or concentric beds can be used. The system is particularly suited to the processing of radioactive and chemically hazardous waste.
 [1];  [2]
  1. (Morgantown, WV)
  2. (Waynesburg, PA)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) NETL
Patent Number(s):
US 5325797
Research Org:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
Country of Publication:
United States
staged; fluidized-bed; combustion; filter; substantially; reducing; quantity; waste; complete; ash-type; solids; gaseous; products; device; portions; primarily; combustor; pyrolyzer; bed; internal; baffles; define; stages; material; moving; therein; fluidized; beds; travel; extended; route; fluidization; movement; achieved; introduction; gases; stage; directional; nozzle; produced; permitted; corresponding; screen; filters; permit; gas; flow; inhibit; catalyst; recycled; share; common; wall; minimize; total; volume; slightly; modified; embodiment; hot; desulfurization; sorbent; regeneration; side-by-side; rectangular; concentric; particularly; suited; processing; radioactive; chemically; hazardous; fluidized-bed combustion; filter bed; total volume; gas desulfurization; fluidized beds; bed combustion; particularly suited; hazardous waste; gas flow; fluidized bed; hot gas; gaseous product; gaseous products; solids flow; substantially reducing; complete combustion; sorbent regeneration; permit gas; gases produced; staged fluidized-bed; material moving; screen filter; type solid; staged fluidized; /110/122/422/588/