Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems

Technical Report · Thu Dec 01 04:00:00 EST 2005

DOI:https://doi.org/10.2172/876011· OSTI ID:876011

Krishnan, Gopala N ^[1]; Malhotra, Ripudaman; Alvarez, Esperanza; Lau, Kai-Hung; Sanjurjo, Angel

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1. SRI International

Heat exchangers, particle filters, turbines, and other components in an integrated coal gasification combined cycle system must withstand the highly sulfiding conditions of the high-temperature coal gas over an extended period of time. The performance of components degrades significantly with time unless expensive high-alloy materials are used. Deposition of a suitable coating on a low-cost alloy may improve its resistance to such sulfidation attack, and decrease capital and operating costs. The alloys used in the gasifier service include austenitic and ferritic stainless steels, nickel-chromium-iron alloys, and expensive nickel-cobalt alloys. During this reporting period, we conducted a simulated gasifier test primarily with TiN-coated steel samples. Although the test showed these coatings to offer significant protection against corrosion, they also revealed a lack of uniformity in the coatings. We spent a considerable amount of effort improving our coatings procedure as well as the fluidized bed reactor and its heater. Based on the results collected thus far, we selected 12 samples and sent them to ConocoPhillips for testing in their gasifier at the Wabash River Energy plant.

• Research Organization: SRI International
• Sponsoring Organization: USDOE
• DOE Contract Number: FC26-03NT41616
• OSTI ID: 876011
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
ALLOYS
CAPITAL
COAL GAS
COAL GASIFICATION
COATINGS
COMBINED CYCLES
CORROSION
DEPOSITION
DIFFUSION COATINGS
FLUIDIZED BED REACTORS
HEAT EXCHANGERS
OPERATING COST
PROGRESS REPORT
STAINLESS STEELS
SULFIDATION
TESTING
TURBINES