Corrosion and degradation of materials in the Synthane coal-gasification pilot plant
Corrosion monitoring of materials was conducted in the operating environments of the Synthane coal gasification pilot plant between 1976 and 1978. Metal and refractory specimens were exposed in the gasifier vessel in two test locations (fluidized bed, freeboard). Metal coupons only were exposed in the gasifier char cooler (freeboard) and four test locations in the quench system (vapor and liquid phases). Exposure times under operating conditions were 181 to 782 h. In two gasifier test locations (600 psig, 1284/sup 0/F and 1434/sup 0/F), the performance of nickel-base alloys with >20 wt % Cr, 40 to 46 wt % Ni, and 3 to 9.1 wt % Mo was consistently better than for other test alloys. Equivalent linear corrosion rates for these better alloys were < 20 mpy (782 h) with Montana Rosebud coal as feedstock; however, with Illinois No. 6 coal the linear rates were >20 mpy but <75 mpy (181 h). IN-600 (76.5 wt % Ni, 15.8 wt % Cr) was found unsuitable for gasifier internal application. All refractories tested in the two gasifier test locations (600 psig, 1284/sup 0/F and 1434/sup 0/F), with the exception of silicon nitride, were not greatly affected during either exposure period. The better materials were monolithic refractories with 5 to 30% porosity and 50 to 60% alumina content. Corrosion monitoring of metals in the gasifier char cooler freeboard (600 psig, 800/sup 0/F) showed that Type 304 was more resistant to corrosion attack than Type 410 and carbon steel (A-515).During exposure in the product gas quench system (5 to 600 psig, 200/sup 0/ to 445/sup 0/F), austenitic stainless steels, IN-600, and Type 430 experienced only limited corrosion loss and slight to moderate pitting attack (maximum pit depth <7 mils). Monel 400 and carbon steel specimens incurred unacceptable levels of degradation.
- Research Organization:
- IIT Research Inst., Chicago, IL (USA)
- DOE Contract Number:
- AC05-76ET10670
- OSTI ID:
- 5324166
- Report Number(s):
- DOE/ET/10670-T2; ON: DE82006223
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
CARBON STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL GASIFICATION
COPPER ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
ELEMENTS
EXPERIMENTAL DATA
FUNCTIONAL MODELS
GASIFICATION
INCONEL 600
INCONEL ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MATERIALS TESTING
METALLOGRAPHY
METALS
MONEL 400
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PILOT PLANTS
PNICTIDES
REFRACTORIES
SILICON COMPOUNDS
SILICON NITRIDES
STAINLESS STEELS
STEELS
SYNTHANE PROCESS
TESTING
THERMOCHEMICAL PROCESSES