Process using sorbents for the removal of SO sub x from flue gas
This patent describes a process for removing the SO{sub x} components from a flue gas stream containing oxygen, sulfur dioxide and sulfur trioxide from the combustion of coal from a coal-fired boiler which comprises combusting the coal in the boiler to provide the flue gas stream and contacting the the gas stream with a heated sorbent composition at 400{degrees} to 1000{degrees} C wherein the the sorbent before being heated is selected from the group consisting of a layered double hydroxide composition of formula: (M{sub 1{minus}x}{sup II}M{sub x}{sup III}(OH){sub 2})(A{sup n{minus}}){sub x/n} {center dot} yH{sub 2}O wherein M{sup II} is a divalent metal cation and M{sup III} is a trivalent metal cation selected from the group consisting of Group IIA. IIB and IIIA metals as the cation which form metal oxides and which are capable of reacting with SO{sub 2} to form metal sulfites and SO{sub 3} to form metal sulfates, A is an interlayer anion of charge n- which comprises at least one metal atoms selected from the group consisting of main group metals and transition metals which provide oxidation of sulfur dioxide to sulfur trioxide in an amount sufficient that the layered double hydroxide structure promotes the oxidation of the sulfur dioxide to the sulfur trioxide at the combustion conditions within the coal-fired boiler, wherein y is moles of water.
- Assignee:
- Board of Trustees, Michigan State Univ., East Lansing, MI (United States)
- Patent Number(s):
- US 5114691; A
- Application Number:
- PPN: US 7-535147
- OSTI ID:
- 5062531
- Resource Relation:
- Patent File Date: 8 Jun 1990
- Country of Publication:
- United States
- Language:
- English
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Layered double hydroxide sorbents for the removal of SO sub x from flue gas resulting from coal combustion
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20 FOSSIL-FUELED POWER PLANTS
42 ENGINEERING
AIR POLLUTION CONTROL
SORBENT INJECTION PROCESSES
COAL
COMBUSTION PRODUCTS
DESULFURIZATION
FLUE GAS
SULFUR DIOXIDE
SORBENT RECOVERY SYSTEMS
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
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010800* - Coal
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200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
421000 - Engineering- Combustion Systems