Overview of the DOE studies of recovery boiler floor tube cracking

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Description

Cracking of the stainless steel layer of coextruded 304L/SA210 recovery boiler floor tubes has been observed in an increasing number of black liquor recovery boilers. Because failure of such tubes is a serious safety concern as well as an economic issue, this project was initiated with the objective of identifying alternate materials or process changes that would prevent tube cracking. Tensile stresses are essential for the most likely failure mechanisms, i.e., fatigue or stress corrosion cracking, therefore stresses were measured at room temperature and modeling was used to predict stresses under operating conditions. Laboratory studies have identified conditions under which ... continued below

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18 p.

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Keiser, J.R.; Taljat, B. & Wang, X.L. March 1, 1998.

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Description

Cracking of the stainless steel layer of coextruded 304L/SA210 recovery boiler floor tubes has been observed in an increasing number of black liquor recovery boilers. Because failure of such tubes is a serious safety concern as well as an economic issue, this project was initiated with the objective of identifying alternate materials or process changes that would prevent tube cracking. Tensile stresses are essential for the most likely failure mechanisms, i.e., fatigue or stress corrosion cracking, therefore stresses were measured at room temperature and modeling was used to predict stresses under operating conditions. Laboratory studies have identified conditions under which composite tubes crack due to thermal fatigue and stress corrosion. Floor tube temperature measurements have defined the magnitude and frequency of temperature fluctuations experienced by such tubes, and smelt corrosion studies have measured the degradation rate when molten smelt comes in contact with tubes. Based on these observations, certain materials appear more likely to resist cracking and certain process changes should help avoid conditions that cause composite tube cracking.

Physical Description

18 p.

Notes

OSTI as DE98004897

Source

  • TAPPI - 1998 international chemical recovery conference, Tampa, FL (United States), 1-4 Jun 1998

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  • Other: DE98004897
  • Report No.: ORNL/CP--97302
  • Report No.: CONF-980647--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/672108 | External Link
  • Office of Scientific & Technical Information Report Number: 672108
  • Archival Resource Key: ark:/67531/metadc703945

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 25, 2016, 12:13 p.m.

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Keiser, J.R.; Taljat, B. & Wang, X.L. Overview of the DOE studies of recovery boiler floor tube cracking, report, March 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc703945/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.