Duct injection technology prototype development

Technical Report · Sun Jul 01 00:00:00 EDT 1990

OSTI ID:5896977

Harper, S L ^[1]

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1. Babcock and Wilcox Co., Alliance, OH (USA). Research and Development Div.

Duct Injection systems remove the sulfur dioxide from flue gas streams by injecting a wet or dry sorbent in the flue gas. Calcium hydroxide is injected as a sorbent which reacts with sulfur dioxide in the flue gas to form a calcium sulfite compound. The major material concerns are: Corrosion from condensing flue gas (wall wetting) and underdeposit damage from deposited fly ash and calcium sulfite. Weld corrosion is also a concern; erosion from slurry injection of the chemical sorbent; and cracking of ceramic components from thermal cycling. Some components have a ceramic coating, such as aluminum oxide to provide protection from the highly erosive environment at the slurry injection sites. These components crack and fail prematurely because of thermal cycling. This test program was designed to determine the corrosion rates of the duct injection construction materials in a range of environments. Carbon steel and Corten A are alloys presently used as the ductwork material. Because the majority of installations of duct injection systems will be retrofits, it is appropriate to evaluate carbon steel and Corten corrosion behavior in this test program. Stainless steel (300 series) is a bolt and hanger material in existing duct structures and also a possible duct material. Hastelloy C-276, a nickel-based alloy, is being used in highly corrosive areas of wet scrubbers. A two-part test program was designed to meet the goals of this test program. First, retort tests were used to evaluate the corrosion behavior of materials under conditions closely simulating expected service environments. Second, electrochemical corrosion tests were performed to evaluate the effect of chlorides, oxygen, and pH upon corrosion rates. 6 refs., 11 figs., 7 tabs.

• Research Organization: United Engineers and Constructors, Inc., Denver, CO (USA). Stearns-Roger Div.; Babcock and Wilcox Co., Alliance, OH (USA). Contract Research Div.
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC22-88PC88852
• OSTI ID: 5896977
• Report Number(s): DOE/PC/88852-T3; ON: DE91009894
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
36 MATERIALS SCIENCE
CALCIUM HYDROXIDES
CORROSIVE EFFECTS
CARBON STEELS
CORROSION
CHLORINE COMPOUNDS
HASTELLOYS
STAINLESS STEEL-317
SULFURIC ACID
DEW POINT
DUCTS
EROSION
FLUE GAS
FLY ASH
PH VALUE
SLURRIES
SORBENT INJECTION PROCESSES
SULFUR DIOXIDE
TEMPERATURE EFFECTS
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ASHES
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
GASEOUS WASTES
HALOGEN COMPOUNDS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
MIXTURES
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDES
OXYGEN COMPOUNDS
RESIDUES
STAINLESS STEELS
STEELS
SULFUR COMPOUNDS
SULFUR OXIDES
SUSPENSIONS
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
360105 - Metals & Alloys- Corrosion & Erosion