Coal-liquefaction-plant fractionation-column corrosion-coupon studies
Severe corrosion has been observed in fractionation columns at the Fort Lewis, Washington, and Wilsonville, Alabama, solvent refined coal pilot plants. This corrosion is most severe for materials exposed in the 220 to 260/sup 0/C (430 to 500/sup 0/F) range and results in corrosion rates of as much as 6.4 mm/y (250 mils/y) for type 18-8 stainless steels. Studies at ORNL of this corrosion problem include exposure of coupons in the columns, analysis of failed components from the pilot plants, chemical analyses of liquids from the pilot plants, and operation of laboratory experiments. This report describes the coupon exposure studies, gives the results of these studies, and discusses the selection of fractionation column materials on the basis of our experience. The studies show that several high-nickel alloys have corrosion rates of less than 0.25 mm/y (10 mils/y) and would be suitable in a fractionation column environment even if no process changes are made to reduce offending species such as chlorine.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5383961
- Report Number(s):
- ORNL/TM-7933; ON: DE82007469
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COAL LIQUIDS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DIAGRAMS
DISTILLATION EQUIPMENT
EQUIPMENT
FAILURE MODE ANALYSIS
FLOWSHEETS
FLUIDS
FUNCTIONAL MODELS
HALIDES
HALOGEN COMPOUNDS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
LIQUIDS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXYGEN COMPOUNDS
PILOT PLANTS
PRICES
RECOMMENDATIONS
SODIUM CARBONATES
SODIUM COMPOUNDS
SRC PROCESS
STAINLESS STEELS
STEELS
SULFIDATION
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TESTING
THERMOCHEMICAL PROCESSES