Reaction of FeS with simulated slag and atmosphere

S. Ranjan, S. Sridhar, R. J. Fruehan

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Dependent upon the size and density of coal particles used in gasifiers, the resulting ash may contain significant quantities of FeS. It is desirable to have these ash particles react and dissolve in the slag. The rate and rate-controlling reaction of FeS droplets with simplified reactor gas and slags were determined using a confocal scanning laser microscope (CSLM) and a thermogravimetric analyzer (TGA). The shrinking FeS droplets were found to remain at the slag/gas interface for a period and conformed to a lens shape, and size change was attributed to both the reaction and submersion into the slag. Whereas the exact rate could not be determined using the CSLM, the rate increased with increasing CO2, decreasing FeO in the slag, and was slow in argon. The change in the rate with experimental values is consistent with the hypothesis that the rate is controlled by mass transfer of the product gases, COS and SO2, away from the particles. TGA results indicated that the measured rate was consistent with the rate computed from the relevant mass-transfer equations and the experimentally determined mass-transfer coefficient. The results indicate that FeS should react, thereby forming FeO, which dissolves in the gasifier slag in a coal gasifier.

Original languageEnglish (US)
Pages (from-to)5002-5007
Number of pages6
JournalEnergy and Fuels
Volume24
Issue number9
DOIs
StatePublished - Sep 16 2010
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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