NOx control in fluidized bed combustion
Patent
·
OSTI ID:5951308
This patent describes a fluidized catalytic cracking (FCC) process wherein conventional FCC catalyst contacts conventional FCC feedstock in a conventional FCC reactor to produce cracked products and coked catalyst which is regenerated in a conventional FCC regenerator. It consists of a single dense bed to which air or an oxygen-containing gas is added to produce a regenerated catalyst and flue gas containing CO/sub 2/ and NO/sub x/ resulting from coke combustion, and wherein carbon monoxide (CO) combustion promotor is uniformly distributed in the catalyst bed to promote complete combustion of CO to CO/sub 2/. The improvement consists of maintaining a majority of the CO combustion promoter as a solid particle with a volume at least 10 times greater than the conventional FCC catalyst and having a low density, relative to the dense bed density, so that the promoter floats to the top of the regenerator dense bed of FCC catalyst in the FCC regenerator, and maintaining a reducing atmosphere in a lower one-half portion of the dense bed of FCC catalyst in the FCC regenerator and converting in the reducing atmosphere at least a portion of the NO/sub x/ formed during coke combustion to nitrogen.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4812431
- OSTI ID:
- 5951308
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400 -- Petroleum-- Processing
020900* -- Petroleum-- Environmental Aspects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
CONTROL
CRACKING
DECOMPOSITION
EMISSION
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYROLYSIS
REGENERATION
THERMOCHEMICAL PROCESSES
020400 -- Petroleum-- Processing
020900* -- Petroleum-- Environmental Aspects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
CONTROL
CRACKING
DECOMPOSITION
EMISSION
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYROLYSIS
REGENERATION
THERMOCHEMICAL PROCESSES