Staged fluidized-bed combustion and filter system
A staged fluidized-bed combustion and filter system are described 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. 10 figures.
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5325797; A
- Application Number:
- PPN: US 8-108501
- OSTI ID:
- 7281299
- Resource Relation:
- Patent File Date: 18 Aug 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
REGENERATION
FLUIDIZED-BED COMBUSTORS
DESIGN
GASES
DESULFURIZATION
GRANULAR BED FILTERS
HAZARDOUS MATERIALS
COMBUSTION
POLLUTION CONTROL EQUIPMENT
RADIOACTIVE WASTES
ASHES
PYROLYSIS
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
COMBUSTORS
DECOMPOSITION
EQUIPMENT
FILTERS
FLUIDS
MATERIALS
MECHANICAL FILTERS
OXIDATION
RADIOACTIVE MATERIALS
RESIDUES
THERMOCHEMICAL PROCESSES
WASTES
052001* - Nuclear Fuels- Waste Processing
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)