Combustion gas desulfurization

Patent · Tue Nov 06 04:00:00 EST 1979

OSTI ID:5426389

Erickson, D C

Hot combustion gas from a coal or oil fired furnace is desulfurized by a regenerative molten alkali salt process. The process is both highly efficient and uncomplicated. Only three major pieces of equipment are required - scrubber, regenerator, and auxiliary combustor. All reactions are adiabatic, no solids handling is required, only steam is required for salt regeneration, and the regeneration product is H/sub 2/S. Process temperature is low enough to minimize corrosion by the salt and to permit efficient fly ash removal prior to salt contact. High regeneration efficiency is achieved using only steam optionally mixed with CO/sub 2/ as regenerant as follows: the combustion gas is maintained slightly reducing which causes the dominant sulfur species in the salt to be the sulfide; the salt cation composition is controlled to yield an acceptably high sulfide concentration in the salt; and salt regeneration is conducted at a significantly higher pressure than scrub.

• Assignee: TIC; EDB-80-065513
• Patent Number(s): US 4173619
• OSTI ID: 5426389
• Country of Publication: United States
• Language: English

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20 FOSSIL-FUELED POWER PLANTS
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AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
DESULFURIZATION
FLUE GAS
FOSSIL-FUEL POWER PLANTS
FURNACES
GASEOUS WASTES
MOLTEN SALTS
OXIDES
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POLLUTION CONTROL
POWER PLANTS
SALTS
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES