Regeneration process for spent SO/sub 2/-NO/sub x/ sorbents
A regeneration process is described for MgO-vermiculite and MgO-perlite sorbents employed to remove nitrogen and sulfur oxides from a flue gas comprising the following steps: (a) Heating the spent sorbents in air to a temperature in the range of 100/sup 0/ to 350/sup 0/C to drive off substantially all free and chemically attached water; (b) Further heating the spent sorbents in an atmosphere containing a reducing gas selected from the group consisting of carbon monoxide, methane and hydrogen to a temperature in the range of 350/sup 0/ to 450/sup 0/C to drive off sorbed nitrogen oxides; (c) Further heating the spent sorbents in the same atmosphere containing a reducing gas to a temperature in the range of 450/sup 0/ to 700/sup 0/C to drive off approximately 90 percent of the sorbed sulfur in the form of sulfur oxides and elemental sulfur and to destroy substantially all nitrogen oxides present in the exit gases; (d) Cooling the sorbents to a temperature below 200/sup 0/C for reuse.
- Assignee:
- Sanitech, Inc., Twinsburg, OH
- Patent Number(s):
- US 4829036
- OSTI ID:
- 5932732
- Resource Relation:
- Patent File Date: Filed date 21 Apr 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
REGENERATION
FLUE GAS
DESULFURIZATION
AIR POLLUTION CONTROL
CHEMICAL COMPOSITION
DESORPTION
MAGNESIUM OXIDES
NITROGEN OXIDES
PERLITE
SULFUR DIOXIDE
VERMICULITE
ALKALINE EARTH
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
GASEOUS WASTES
IGNEOUS ROCKS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON COMPOUNDS
IRON SILICATES
MAGNESIUM COMPOUNDS
MAGNESIUM SILICATES
MATERIALS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
ROCKS
SILICATES
SILICON COMPOUNDS
SULFUR COMPOUNDS
SULFUR OXIDES
TRANSITION ELEMENT COMPOUNDS
VOLCANIC ROCKS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200200 - Fossil-Fueled Power Plants- Waste Management
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)