Tubing wastage in fluidized-bed coal combustors: Examinations of tubing from Test Series 2, NCB (IEA Grimethorpe) Ltd. Facility

Conference · Fri Oct 30 04:00:00 EST 1987

OSTI ID:5784854

Witherell, C E; Meisenheimer, R G

This study of wasted heat-exchanger tubing from the Grimethorpe PFBC Facility was conducted to characterize affected fireside surfaces and identify the mechanism/s responsible. Examinations showed that the wasted surfaces are not typical of those produced by erosion alone, as oxide deposits are present on all surfaces. Continual exfoliation of the normally-protective oxide layer is probably responsible for a major portion of tubing wastage. There are also indications of direct metal loss occurring through a series of events wherein repeatd formation and exfoliation of surface oxides produce an irregular metal interface that is mechanically deformed during combustor operation. The cold-worked metal protrusions, or platelets, on the roughened surface readily fracture from the tubing wall and are lost into the bed. 27 refs., 23 figs., 3 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5784854
• Report Number(s): UCRL-97569; CONF-871191-1; ON: DE88002668
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
420400 -- Engineering-- Heat Transfer & Fluid Flow
BINDING ENERGY
CHALCOGENIDES
CHEMICAL ANALYSIS
COMBUSTORS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEPOSITS
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
FLUIDIZED BED HEAT EXCHANGERS
FLUIDIZED-BED COMBUSTORS
HEAT EXCHANGERS
IRON COMPOUNDS
IRON OXIDES
LINE DEFECTS
LOSSES
METALS
MICROSCOPY
MICROSTRUCTURE
NONDESTRUCTIVE ANALYSIS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
SULFUR
SURFACES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
TUBES
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS