Carbon formation and metal dusting in advanced coal gasification processes Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

  • Main Title Carbon formation and metal dusting in advanced coal gasification processes

Creator

  • Author: DeVan, J.H.
    Creator Type: Personal
  • Author: Tortorelli, P.F.
    Creator Type: Personal
  • Author: Judkins, R.R.
    Creator Type: Personal
  • Author: Wright, I.G.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Office of the Assistant Secretary for Fossil Energy.
    Contributor Type: Organization
    Contributor Info: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)

Publisher

  • Name: Oak Ridge National Laboratory
    Place of Publication: Tennessee
    Additional Info: Oak Ridge National Lab., TN (United States)

Date

  • Creation: 1997-02-01

Language

  • English

Description

  • Content Description: The product gases generated by coal gasification systems contain high concentrations of CO and, characteristically, have relatively high carbon activities. Accordingly, carbon deposition and metal dusting can potentially degrade the operation of such gasifier systems. Therefore, the product gas compositions of eight representative gasifier systems were examined with respect to the carbon activity of the gases at temperatures ranging from 480 to 1,090 C. Phase stability calculations indicated that Fe{sub 3}C is stable only under very limited thermodynamic conditions and with certain kinetic assumptions and that FeO and Fe{sub 0.877}S tend to form instead of the carbide. As formation of Fe{sub 3}C is a necessary step in the metal dusting of steels, there are numerous gasifier environments where this type of carbon-related degradation will not occur, particularly under conditions associated with higher oxygen and sulfur activities. These calculations also indicated that the removal of H{sub 2}S by a hot-gas cleanup system may have less effect on the formation of Fe{sub 3}C in air-blown gasifier environments, where the iron oxide phase can exist and is unaffected by the removal of sulfur, than in oxygen-blown systems, where iron sulfide provides the only potential barrier to Fe{sub 3}C formation. Use of carbon- and/or low-alloy steels dictates that the process gas composition be such that Fe{sub 3}C cannot form if the potential for metal dusting is to be eliminated. Alternatively, process modifications could include the reintroduction of hydrogen sulfide, cooling the gas to perhaps as low as 400 C and/or steam injection. If higher-alloy steels are used, a hydrogen sulfide-free gas may be processed without concern about carbon deposition and metal dusting.
  • Physical Description: 41 p.

Subject

  • Keyword: Coal Gasification
  • Keyword: Carbon Steels
  • Keyword: Carbon Monoxide
  • STI Subject Categories: 01 Coal, Lignite, And Peat
  • STI Subject Categories: 36 Materials Science
  • Keyword: Iron Carbides
  • Keyword: Fouling
  • Keyword: Iron Oxides
  • Keyword: Low Alloy Steels
  • Keyword: Iron Sulfides
  • Keyword: Gas Generators
  • Keyword: Hydrogen Sulfides
  • Keyword: Hot Gas Cleanup
  • Keyword: Recommendations

Source

  • Other Information: PBD: Feb 1997

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE98003630
  • Report No.: ORNL/TM--13014
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/663389
  • Office of Scientific & Technical Information Report Number: 663389
  • Archival Resource Key: ark:/67531/metadc706082

Note

  • Display Note: OSTI as DE98003630