Process for simultaneous removal of SO/sub 2/ and NO/sub x/ from gas streams
Patent
·
OSTI ID:6862280
A process is described for simultaneous removal of SO/sub 2/ and NO/sub x/ from a gas stream comprising: a. flowing the gas stream to a spray dryer and absorbing a portion of the SO/sub 2/ content of the gas stream and a portion of the NO/sub x/ content of the gas stream with ZnO by contacting the gas stream with a spray of an aqueous ZnO slurry; b. controlling the gas outlet temperature of the spray dryer to within the range of a 0/sup 0/ to 125/sup 0/F approach to the adiabatic saturation temperature; c. flowing the gas, unreacted ZnO and ZnO with absorbed SO/sub 2/ and NO/sub x/ from the spray dryer to a fabric filter and collecting any solids therein and absorbing a portion of the SO/sub 2/ remaining in the gas stream and a portion of the NO/sub x/ remaining in the gas stream with ZnO; and d. controlling the ZnO content of the aqueous slurry so that sufficient unreacted ZnO is present in the solids collected in the fabric filter to react with SO/sub 2/ an NO/sub x/ as the gas passes through the fabric filter whereby the overall feed ratio of ZnO to SO/sub 2/ plus NO/sub x/ is about 1.0 to 4.0 moles of ZnO per mole of SO/sub 2/ and about 0.5 to 2.0 moles of ZnO per mole of NO/sub x/.
- Assignee:
- Battelle Memorial Institute, Columbus, OH
- Patent Number(s):
- US 4640825
- OSTI ID:
- 6862280
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADIABATIC PROCESSES
ADSORPTION
AIR POLLUTION CONTROL
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DENITRIFICATION
DESULFURIZATION
DISPERSIONS
DRYING
FABRIC FILTERS
FILTERS
FLUE GAS
FLUID FLOW
GAS FLOW
GASEOUS WASTES
KINETICS
LOW TEMPERATURE
MEDIUM TEMPERATURE
MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
QUANTITY RATIO
REACTION KINETICS
REMOVAL
SATURATION
SLURRIES
SOLUTIONS
SORPTION
SPRAY DRYING
SPRAYS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SUSPENSIONS
TEMPERATURE CONTROL
WASTES
ZINC COMPOUNDS
ZINC OXIDES
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADIABATIC PROCESSES
ADSORPTION
AIR POLLUTION CONTROL
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DENITRIFICATION
DESULFURIZATION
DISPERSIONS
DRYING
FABRIC FILTERS
FILTERS
FLUE GAS
FLUID FLOW
GAS FLOW
GASEOUS WASTES
KINETICS
LOW TEMPERATURE
MEDIUM TEMPERATURE
MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
QUANTITY RATIO
REACTION KINETICS
REMOVAL
SATURATION
SLURRIES
SOLUTIONS
SORPTION
SPRAY DRYING
SPRAYS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SUSPENSIONS
TEMPERATURE CONTROL
WASTES
ZINC COMPOUNDS
ZINC OXIDES