Cyclone reburning retrofit-corrosion evaluation

Technical Report · Tue Jan 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/6083783· OSTI ID:6083783

Sarv, H

Reduction of oxides of nitrogen (NO{sub x}) from cyclone-equipped boilers is best accomplished by the application of reburning technology. Reburning process involves injection of a supplementary fuel above the cyclone to create a reducing zone for NO{sub x} removal. Overfire air is introduced above this zone to achieve complete combustion. Since the reburning zone must operate substoichiometrically, tube corrosion due to H{sub 2}S formation within the modified combustion zones can be a potential concern when the reburning fuel is a high-sulfur coal. H{sub 2}S is a corrosive gas and its concentration is an indicator of the tendency for fireside corrosion in fuel-rich combustion systems. This research program was undertaken to assess corrosion resistance of three commercially available alloys (carbon steel, SA210-A1; low-alloy steel, SA213-T22; and stainless steel, SA213-TP304) as well as coated steel alloy (SA213-T2). The surface chromium contents of the alloys ranged from 0 to 30%. Four air-cooled corrosion probes, each containing segments of the selected alloys were constructed. The probes were exposed for up to 1200 hours and at a metal temperature of 850{degrees}F to combustion gases generated by firing a high-sulfur Illinois {number sign}6 coal at conditions simulating coal reburning.

• Research Organization: Babcock and Wilcox Co., Alliance, OH (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90176
• OSTI ID: 6083783
• Report Number(s): DOE/PC/90176-T54; ON: DE92004190
• Country of Publication: United States
• Language: English

Related Subjects

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200104 -- Fossil-Fueled Power Plants-- Components
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36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
AIR POLLUTION ABATEMENT
ALLOYS
CARBON STEELS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM
COMBUSTION
COMBUSTORS
CORROSION
CORROSIVE EFFECTS
CYCLONE COMBUSTORS
DOCUMENT TYPES
ELEMENTS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
PROGRESS REPORT
STAGED COMBUSTION
STAINLESS STEELS
STEELS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
TUBES