Process for producing CO/sub 2/, and CO/sub 2/ so produced
Fuel is passed to a fluidized fuel conversion bed containing reactive CaO and CaSo/sub 4/ at a fuel-oxidation temperature (e.g. 730/sup 0/ C.) below the temperature at which CaO reacts with CO/sub 2/ to form CaCO/sub 3/. The bed is fluidized by an inerts-free gas containing hydrogen (and/or a source thereof, e.g. steam) and fuel is therein partially oxidized, CaSO/sub 4/ being reduced to CaS. CO/sub 2/ thus formed is fixed as CaCO/sub 3/, and bed solids containing CaS and CaCO/sub 3/ pass to a fluidized decarbonation bed operated at a temperature (e.g. 850/sup 0/C.) above the decarbonation temperature of CaCO/sub 3/ whereby CO/sub 2/ is liberated and is recovered after passage through a heat recovery device. Decarbonation bed is preferably fluidized by the gas products from the fuel conversion which reduce CaSO/sub 4/ therein to CaS and form additional CO/sub 2/. Bed solids containing CaS and CaO pass to an oxidation bed fluidized with air to convert CaS to CaSO/sub 4/ with much heat liberation. Hot bed solids are returned to the decarbonation and fuel conversion beds to furnish heat and CaSO/sub 4/ to maintain the reactions therein.
- Assignee:
- Exxon Research and Engineering Co.
- Patent Number(s):
- US 4431622
- OSTI ID:
- 7078077
- Resource Relation:
- Patent Priority Date: Priority date 24 Mar 1981, United Kingdom of Great Britain and Northern Ireland (UK); Other Information: PAT-APPL-360412
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CALCIUM CARBONATES
DECARBONIZATION
CALCIUM OXIDES
FLUIDIZED BED
CALCIUM SULFIDES
CARBON DIOXIDE
PRODUCTION
RECYCLING
DESULFURIZATION
DISPLACEMENT FLUIDS
FUELS
HEAT RECOVERY
OXIDATION
REDUCTION
WASTE HEAT UTILIZATION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
ENERGY RECOVERY
FLUIDS
OXIDES
OXYGEN COMPOUNDS
RECOVERY
SULFIDES
SULFUR COMPOUNDS
WASTE PRODUCT UTILIZATION
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)
320303 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes