Combined SO sub 2 /NO sub x control using ferrouster dot EDTA and a secondary additive in a lime-based aqueous scrubber system. [Sodium ascorbate]
Integration of NO{sub x} control into existing flue-gas desulfurization (FGD) systems addresses site-specific control requirements while minimizing retrofit difficulties. Argonne has studied the use of the metal-chelate additives, such as ferrous{center dot}EDTA in various wet FGD chemistries, to promote combined SO{sub 2}/NO{sub x} scrubbing. A major process problem is oxidation of the iron to the ferric species, leading to a significant decrease in NO{sub x}-removal capability. Argonne discovered a class of organic compounds that, when used with ferrous{center dot}EDTA in a sodium carbonate chemistry, could maintain high levels of NO{sub x} removal. However, those antioxidant/reducing agents are not effective in a lime-based chemistry, and a broader investigation of antioxidants was initiated. This paper discusses results of that investigation, which found a practical antioxidant/reducing agent capable of maintaining NO{sub x} removals of about 50% (compared with about 15% without the agent) in a lime-based FGD chemistry with FE(II){center dot}EDTA. 5 refs., 10 figs.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6025595
- Report Number(s):
- ANL/CP-72760; CONF-911226-1; ON: DE92003419
- Resource Relation:
- Conference: SO/sub 2/ control symposium, Washington, DC (United States), 3-6 Dec 1991
- Country of Publication:
- United States
- Language:
- English
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20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
ANTIOXIDANTS
FLUE GAS
DESULFURIZATION
NITROGEN OXIDES
AIR POLLUTION CONTROL
SULFUR DIOXIDE
ADDITIVES
CALCIUM HYDROXIDES
COMBINED SOXNOX PROCESSES
EDTA
IRON
PYROGALLOL
SCRUBBERS
SODIUM CARBONATES
UREA
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMIDES
AMINO ACIDS
AROMATICS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL REACTIONS
CONTROL
DEVELOPERS
ELEMENTS
EQUIPMENT
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
METALS
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POLYPHENOLS
SODIUM COMPOUNDS
SULFUR COMPOUNDS
SULFUR OXIDES
TRANSITION ELEMENTS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)