Duct injection technology prototype development

Technical Report · Sun Jul 01 04:00:00 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: DOE; 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
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ASHES
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CARBON STEELS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CORROSION
CORROSIVE EFFECTS
DEW POINT
DISPERSIONS
DUCTS
EROSION
FLUE GAS
FLY ASH
GASEOUS WASTES
HALOGEN COMPOUNDS
HASTELLOYS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
MIXTURES
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
RESIDUES
SLURRIES
SORBENT INJECTION PROCESSES
STAINLESS STEEL-317
STAINLESS STEELS
STEELS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFURIC ACID
SUSPENSIONS
TEMPERATURE EFFECTS
WASTES