Theoretical evaluation of thermal imaging for detection of erosive wear of internally refractory-lined transfer lines
Infrared scanning has potential use in detecting erosive wear (thickness change) of the refractory surface of large-diameter steel pipes internally lined with refractory concrete, which are typical of those used in coal-conversion processes. An analytical study was conducted to determine the viability of this method. Heat-transfer models were developed to predict surface-temperature distributions on the outer metal surface for various erosive-wear conditions on the inner surface, assuming uniform inner-surface temperature. Variables investigated included thermal conductivity of the refractory concrete, thermal contact resistance between the steel shell and the refractory, outer-surface convective coefficient, outer-surface radiative properties, and refractory-lining thickness and composition. The study used two- and three-dimensional heat-transfer models and various well-defined rectangular cavities on the inner surface. Temperature resolution, and thus calculation of cavity sizes from surface-temperature profiles, is better when the convective coefficient is small and the interfacial contact resistance is uniformly low. The presence of dual refractory-concrete liners using a layer of insulating concrete between the hot-face lining and the steel shell, together with thick steel (t > 25 mm), tends to smear temperature patterns and reduce the temperature gradient so that calculation of cavity shapes becomes impractical. 44 figures, 15 tables.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5091092
- Report Number(s):
- ANL-78-82
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
COAL GASIFICATION PLANTS
PIPES
COAL LIQUEFACTION PLANTS
EROSION
REFRACTORIES
COMPUTER CODES
CONCRETES
CONVECTION
HEAT TRANSFER
LAYERS
LINERS
NONDESTRUCTIVE TESTING
SURFACES
THERMAL CONDUCTIVITY
THERMOGRAPHY
THICKNESS
WEAR
BUILDING MATERIALS
DIMENSIONS
ENERGY TRANSFER
INDUSTRIAL PLANTS
MATERIALS
MATERIALS TESTING
MEASURING METHODS
PHYSICAL PROPERTIES
TESTING
THERMODYNAMIC PROPERTIES
010404* - Coal
Lignite
& Peat- Gasification
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion