Analysis of composite tube cracking in recovery boiler floors

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Description

Cracking of co-extruded (generally identified as composite) floor tubes in kraft black liquor recovery boilers was first observed in Scandinavia, but this problem has now been found in many North American boilers. In most cases, cracking in the outer 304L stainless steel has not progressed into the carbon steel, but the potential for such crack propagation is a cause of concern. A multidimensional study has been initiated to characterize the cracking seen in composite floor tubes, to measure the residual stresses resulting from composite tube fabrication, and to predict the stresses in tubes under operating conditions. The characterization studies include ... continued below

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14 p.

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Keiser, J.R.; Taljat, B.; Wang, X.L.; Maziasz, P.J.; Hubbard, C.R.; Swindeman, R.W. et al. August 1, 1996.

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Description

Cracking of co-extruded (generally identified as composite) floor tubes in kraft black liquor recovery boilers was first observed in Scandinavia, but this problem has now been found in many North American boilers. In most cases, cracking in the outer 304L stainless steel has not progressed into the carbon steel, but the potential for such crack propagation is a cause of concern. A multidimensional study has been initiated to characterize the cracking seen in composite floor tubes, to measure the residual stresses resulting from composite tube fabrication, and to predict the stresses in tubes under operating conditions. The characterization studies include review of available reports and documents on composite tube cracking, metallographic examination of a substantial number of cracked tubes, and evaluation of the dislocation structure in cracked tubes. Neutron and X-ray diffraction are being used to determine the residual stresses in composite tubes from two major manufacturers, and finite element analysis is being used to predict the stresses in the tubes during normal operation and under conditions where thermal fluctuations occur.

Physical Description

14 p.

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OSTI as DE96013784

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  • Technical Association of Pulp Paper Institute (TAPPI) engineering conference, Chicago, IL (United States), 15-19 Sep 1996

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  • Other: DE96013784
  • Report No.: CONF-9609222--1
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/383558 | External Link
  • Office of Scientific & Technical Information Report Number: 383558
  • Archival Resource Key: ark:/67531/metadc683456

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Office of Scientific & Technical Information Technical Reports

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  • August 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 21, 2016, 3:24 p.m.

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Keiser, J.R.; Taljat, B.; Wang, X.L.; Maziasz, P.J.; Hubbard, C.R.; Swindeman, R.W. et al. Analysis of composite tube cracking in recovery boiler floors, report, August 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc683456/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.