Hydrogen sulfide corrosion in low NO sub X staged combustion systems

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5364465

Chou, S F; Daniel, P L; Blazewicz, A J; Dudek, R F ^[1]

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1. Babcock and Wilcox, Alliance, OH (USA)

Various alloys and coatings were tested in simulated low NO{sub x} staged combustion gases containing 0.5 and 2.0 percent H{sub 2}S at 260, 371 and 482 C for 1,000, 2,000, and 4,000 hours. Alloys that were tested include carbon steel, low chromium steels, austenitic stainless steels, Fe-16% Cr-5% Al Alloy, Inconel 671 and Incoloy 800. Coatings on carbon steel that were tested included aluminum and chromium diffusion coatings, and plasma sprayed coatings. The effects of thermal cycling, ash deposit and gas chemistry on the corrosion rates were determined. In general, the corrosion products on austenitic stainless steels and low chromium steels consist of an outer sulfide layer and an inner oxide layer containing sulfur. The outer sulfide layer is nonadherent and exfoliates easily. The inner layer is dense, compact and adherent, and provides some protection against corrosion. Nonetheless, the corrosion rates are much greater than those in air or steam and are close to those in H{sub 2}-H{sub 2}S gas mixtures at the same temperature. The corrosion rates are proportional to the H{sub 2}S concentration. Adding one percent of oxygen to the test gas reduces the corrosion rates significantly. Corrosion resistance and resistance to the detrimental effects of thermal cycling increase as the chromium content in the alloy increases. Inconel 671, Fe-16% Cr-5% A1 Alloy and Types 310 and 309 stainless steels have good resistance to H{sub 2}S corrosion. The Fe-16% Cr-5% A1 plasma coating also appears to be quite resistant to corrosion by H{sub 2}S.

• OSTI ID: 5364465
• Report Number(s): CONF-840909--
• Journal Information: TMS (The Metallurgical Society) Paper Selection; (USA), Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Vol. 56; ISSN 0197-1689; ISSN TMPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AIR POLLUTION ABATEMENT
ALLOY-FE46NI33CR21
ALLOY-NI51CR48
ALLOYS
ALUMINIUM
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
ASHES
AUSTENITIC STEELS
CARBON STEELS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COATINGS
COMBUSTION
COMBUSTORS
CORROSION
CORROSION PRODUCTS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DEPOSITION
ELEMENTS
FLUIDS
GASES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INCOLOY 800
INCOLOY ALLOYS
INCONEL 671
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
LAYERS
MATERIALS
METALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLASMA ARC SPRAYING
POLLUTION ABATEMENT
QUANTITY RATIO
RESIDUES
SPRAY COATING
SPRAYED COATINGS
STAGED COMBUSTION
STAINLESS STEEL-309
STAINLESS STEEL-310
STAINLESS STEELS
STEEL-CR23NI14
STEEL-CR25NI20
STEELS
SULFIDES
SULFUR COMPOUNDS
SURFACE COATING
THERMAL CYCLING
THERMOCHEMICAL PROCESSES
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENTS