Coal gasifier having an elutriated feed stream
Gulf Oil Corp.'s newly developed nonpolluting coal gasification process incorporates improved process economy (especially in water usage) and reliability. Water makeup for use as steam or as wash water may include polluted, solids-containing water from other processes. In the process, a first stream of coal is burned without bed formation in a combustion zone in the presence of water under oxidation conditions (2200 to 3300/sup 0/F; residence time of up to 30 sec) to produce gases containing carbon dioxide and steam. A second stream of coal is maintained as a fluidized bed in a separate gasifier zone by upflowing carbon dioxide and steam from the combustion zone, while being gasified under reducing conditions (1400 to 2000/sup 0/F; 10 psi) to produce carbon monoxide and hydrogen. Feed coal for both streams is crushed and then elutriated to remove coal fines (which are too small to be retained in the gasifier fluidized bed) from coarse particulates. The elutriated fines are water-scrubbed to form a slurry which comprises all or part of the first stream of coal entering the combustion zone, while the coarse particulates comprise the second stream.
- Assignee:
- Gulf Oil Corp.
- Patent Number(s):
- US 3971635
- OSTI ID:
- 6727609
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL FINES
COAL GASIFICATION
COMBUSTION
CRYOGENIC FLUIDS
DISPERSIONS
ELEMENTS
ELUTRIATION
FLUIDIZED BED
FLUIDS
FUEL SLURRIES
FUELS
GASIFICATION
HYDROGEN
MIXTURES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SCRUBBING
SEPARATION PROCESSES
SLURRIES
STEAM
SUSPENSIONS
THERMOCHEMICAL PROCESSES