Fireside corrosion testing of candidate superheater tube alloys, coatings, and claddings

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Description

Fireside corrosion, caused by liquid alkali-iron trisulfates, has been an obstacle to higher steam temperatures and to efficient utilization of high-sulfur coals. Tests simulating the environment in the superheater bank of a pulverized-coal-fired boiler were conducted on several promising new alloys and claddings. Alloys were exposed to a variety of synthetic ash and simulated flue gas compositions at 650 and 700{degrees}C for times ranging up to 800 hours. Included in the testing program were new high-chromium/high-nickel alloys, modified commercial alloys, lean stainless steels (modified Type 316) clad with high-chromium/high-nickel alloys, and intermetallic aluminides. Thickness loss measurements indicated that resistance to ... continued below

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Pages: (116 p)

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Van Weele, S. (Foster Wheeler Development Corp., Livingston, NJ (United States)) August 1, 1991.

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Description

Fireside corrosion, caused by liquid alkali-iron trisulfates, has been an obstacle to higher steam temperatures and to efficient utilization of high-sulfur coals. Tests simulating the environment in the superheater bank of a pulverized-coal-fired boiler were conducted on several promising new alloys and claddings. Alloys were exposed to a variety of synthetic ash and simulated flue gas compositions at 650 and 700{degrees}C for times ranging up to 800 hours. Included in the testing program were new high-chromium/high-nickel alloys, modified commercial alloys, lean stainless steels (modified Type 316) clad with high-chromium/high-nickel alloys, and intermetallic aluminides. Thickness loss measurements indicated that resistance to attach improved with increasing chromium level. Silicon and aluminum were also helpful in resisting attack, while molybdenum was detrimental to the resistance of the alloys to attack. Three different attack modes were observed on the alloys tested. Alloys with low resistance to attack exhibited uniform wastage, while pitting was observed in more resistant alloys. In addition to surface fluxing by molten alkali-iron trisulfates, subsurface sulfur penetration and intergranular attack also occurred.

Physical Description

Pages: (116 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92008500
  • Report No.: ORNL/Sub-89-SA187/02
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/5767769 | External Link
  • Office of Scientific & Technical Information Report Number: 5767769
  • Archival Resource Key: ark:/67531/metadc1101188

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Office of Scientific & Technical Information Technical Reports

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  • August 1, 1991

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • March 2, 2018, 5:52 p.m.

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Van Weele, S. (Foster Wheeler Development Corp., Livingston, NJ (United States)). Fireside corrosion testing of candidate superheater tube alloys, coatings, and claddings, report, August 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1101188/: accessed April 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.