Alloy corrosion and erosion in coal preparation plants
- Dept. of Mechanical Engineering and Energy Processes, Southern Illinois Univ. at Carbondale, Carbondale, IL (US)
This paper discusses piping and other hardware in coal preparation plants which are susceptible to degradation by dissolved salts and suspended coal in the process water. Because the coal mined underground in Appalachia and the Midwest is now increasing in chlorine content, there could be an adverse impact on materials performance. In-plant tests were conducted to determine the effect of chlorine concentration in process water on corrosion and erosion rates and to explore methods of corrosion control. The results showed an inverse dependence of corrosion rate on chloride ion content of the process water. Supplementary experiments conducted in the laboratory showed that the corrosion rate of 1018 steel goes through a maximum as a function of the chloride plus sulfate concentrations in water. Also in the plant tests, cupronickel alloys not considered previously for this application performed well, but metal wastage of the cupronickels was greater than for 304 stainless steel. Success was achieved in cathodically protecting two wear-resistant alloys in coal slurry piping.
- OSTI ID:
- 7046307
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 47:5; ISSN CORRA; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COAL PREPARATION PLANTS
COPPER ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DISPERSIONS
ELEMENTS
HALOGENS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MIXTURES
NICKEL ALLOYS
NONMETALS
OXYGEN COMPOUNDS
PIPELINES
SLURRIES
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
SULFATES
SULFUR COMPOUNDS
SUSPENSIONS
TESTING
WATER CHEMISTRY