Recovery of lime from coal gasifier waste containing calcium sulfide

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Calcium-based materials hold great promise as sorbents for reduced sulfur compounds at high temperature. Such materials are needed for hot gas clean up or for direct addition to coal gasifiers in several types of integrated coal gasification, combined-cycle (IGCC) power generation systems under development. However, their use has been hindered by the lack of a suitable regeneration process for converting CaS back to CaO. Recently, it was discovered in the laboratory that CaS particles can be converted rapidly and almost completely to CaO by a cyclic process which exposures the material alternately and repeatedly to oxidation and reduction at 900 ... continued below

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7 p.

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Jagtap, S.B. & Wheelock, T.D. October 1, 1995.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

Calcium-based materials hold great promise as sorbents for reduced sulfur compounds at high temperature. Such materials are needed for hot gas clean up or for direct addition to coal gasifiers in several types of integrated coal gasification, combined-cycle (IGCC) power generation systems under development. However, their use has been hindered by the lack of a suitable regeneration process for converting CaS back to CaO. Recently, it was discovered in the laboratory that CaS particles can be converted rapidly and almost completely to CaO by a cyclic process which exposures the material alternately and repeatedly to oxidation and reduction at 900 to 1,100 C. During oxidation with air a small portion of CaS is converted to CaSO{sub 4} which upon treatment with a reducing gas is converted to CaO. By repeating the cycle numerous times, individual particles are converted completely to CaO. Such a process can be carried out in a fluidized bed reactor which either has both oxidizing and reducing zones or is supplied with gas that is alternately oxidizing and reducing. The cyclic oxidation/reduction process for converting CaS to CaO has been demonstrated with a thermogravimetric analysis (TGA) systems, and the results are reported below. The effects of temperature and gas composition on the overall rate of conversion are indicated as well as the effect of subjecting typical sorbent materials to repeated sulfidation and regeneration.

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7 p.

Notes

OSTI as DE96000208

Source

  • 8. international conference on coal science, Oviedo (Spain), 10-15 Sep 1995

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  • Other: DE96000208
  • Report No.: IS-M--830
  • Report No.: CONF-950963--2
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 106528
  • Archival Resource Key: ark:/67531/metadc618569

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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.

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  • October 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Dec. 3, 2015, 6:47 p.m.

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Jagtap, S.B. & Wheelock, T.D. Recovery of lime from coal gasifier waste containing calcium sulfide, article, October 1, 1995; Iowa. (digital.library.unt.edu/ark:/67531/metadc618569/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.