Catalytic oxidation of SO sub 2 to SO sub 3 in the presence of fly ash

Patent · Tue Apr 30 04:00:00 EDT 1991

OSTI ID:5135534

Altman, R A; Gooch, J P; Dismukes, E B

This patent describes a combustion gas conditioning method whereby particulates are removed from the main stream of combustion gases containing sulfur dioxide in a flue by electrostatic precipitation means. It comprises: the steps of withdrawing from a location upstream of the electrostatic precipitation means a minor amount of the total volume of the combustion gases entering the flue, including the particulates associated with the minor amount of combustion gases; contacting the minor amount of combustion gases and particulates associated therewith with catalytic means to convert SO{sub 2} contained therein to SO{sub 3}; and mixing the minor amount of combustion gases and SO{sub 3} into the main stream of combustion gases and subjecting the mixture formed thereby to electrostatic precipitation; wherein the catalytic means is exposed to the combustion gases within an open gas flow passage whereby particulates freely flow therethrough without substantially interfering with the catalytic conversion of SO{sub 2} to SO{sub 3} by the catalytic means.

• Assignee: Electric Power Research Inst., Palo Alto, CA (USA)
• Patent Number(s): US 5011516; A
• Application Number: PPN: US 7-432068
• OSTI ID: 5135534
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AEROSOL WASTES
AIR POLLUTION CONTROL
ASHES
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
COMBUSTORS
CONTROL
DESULFURIZATION
ELECTROSTATIC PRECIPITATORS
EQUIPMENT
FLUE GAS
FLY ASH
GASEOUS WASTES
KINETICS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REACTION KINETICS
RESIDUES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TECHNOLOGY ASSESSMENT
WASTES