Corrosion and degradation of test materials in the Mountain Fuel Resources 30 ton/day coal gasification Process Development Unit
One period of in-plant exposure (lower section of gasifier and steam superheater) of candidate alloys for gasification applications was completed in the Mountain Fuel Resources, Inc. (MFR) Process Development Unit (PDU). During this brief period of exposure (294 h gasifying coal), temperatures at the test sites were 140/sup 0/F (60/sup 0/C) at the lower section of the gasifier and ranged from 350/sup 0/ to 500/sup 0/F (177/sup 0/ to 260/sup 0/C) during steady-state periods in the steam superheater but were sometimes <300/sup 0/F (149/sup 0/C). These lower temperatures, encountered during process upsets, were in many cases lower than the dew point of the product gas. Operating pressures were 300 psi (2.1 MPa) in the gasifier and ranged from 50 to 200 psig (0.4 to 1.4 MPa gauge) in the superheater. Fouling of heat exchanger surfaces was also reported. At the lower section of the gasifier, A515 carbon steel, aluminized carbon steel, 2 1/4Cr-1Mo, 1 1/4Cr-1Mo, 9Cr-1Mo, and 410 SS suffered from heavy corrosion and they cannot be considered for use in this system. Types 304 SS and 316 SS showed acceptable general corrosion resistance, but they suffered from pitting. Incoloy 800 was the only one of the alloys tested that exhibited excellent resistance to overall corrosion and pitting. In the steam superheater, high alloy steels Type 310, 26-1, 18-2, and Type 304 incurred the least amount of corrosion damage; corrosion rates were <10 mpy (0.25 mm/y). Alloy Incoloy 800 performed nominally at 21 mpy (0.53 mm/y). The remaining alloys 1 1/4Cr-1/2Mo, 2 1/4Cr-1Mo, Type 410, 253MA and 9Cr-1Mo(Mod.) experienced unacceptable localized corrosion losses; corrosion rates were >150 mpy (3.81 mm/y). Pack-aluminized carbon steel A515 showed no evidence of diffusion zone penetration and was acceptable in corrosion performance. 14 refs., 9 figs., 7 tabs.
- Research Organization:
- Metal Properties Council, Inc., New York (USA); IIT Research Inst., Chicago, IL (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5708396
- Report Number(s):
- DOE/OR/21400-T151; MPCI-22241-2; ON: DE85012387
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
ALLOYS
CARBON STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION
COAL GASIFICATION PLANTS
CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
DEW POINT
EXPERIMENTAL DATA
FUNCTIONAL MODELS
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NUMERICAL DATA
PROCESS DEVELOPMENT UNITS
STAINLESS STEEL-304
STAINLESS STEEL-310
STAINLESS STEEL-410
STAINLESS STEELS
STEELS
SUPERHEATERS
TESTING
THERMOCHEMICAL PROCESSES