Selenium emission control at high temperatures with mineral sorbents. Final report, September 1, 1994--February 29, 1996

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Description

The focus of this project is on toxic metal removal by sorbent injection in the upper furnace and economizer sections of a coal- fired boiler. Selenium was chosen as the candidate heavy metal to be studied because of its high volatility and associated difficulties in removal. A thorough mechanistic investigation of the SeO{sub 2}-Ca(OH){sub 2} interaction at both medium and high temperatures has been conducted in this project. Experiments were performed in the two temperature ranges in the presence and absence of O{sub 2}; desorption studies were conducted to characterize the nature of interaction; and XRD/XPS and Ion Chromatography studies ... continued below

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30 p.

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Ghosh-Dastidar, A.; Mahuli, S.; Agnihotri, R. & Fan, Liang-Shih March 1, 1996.

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Description

The focus of this project is on toxic metal removal by sorbent injection in the upper furnace and economizer sections of a coal- fired boiler. Selenium was chosen as the candidate heavy metal to be studied because of its high volatility and associated difficulties in removal. A thorough mechanistic investigation of the SeO{sub 2}-Ca(OH){sub 2} interaction at both medium and high temperatures has been conducted in this project. Experiments were performed in the two temperature ranges in the presence and absence of O{sub 2}; desorption studies were conducted to characterize the nature of interaction; and XRD/XPS and Ion Chromatography studies were performed for species identification. It was inferred from these findings that the selenium capture was significantly more in the medium temperature range (450-650{degrees}C) than in high temperature range (800-1000{degrees}C) and the captured selenium species in the medium temperature range is in the form of calcium selenite (CaSeO{sub 3}) and a reaction scheme was proposed for the CaO/SeO{sub 2} interaction: CaO (s) + SeO{sub 2} (g) = CaSeO{sub 3} (s). This reaction process does not require the participation of oxygen, as was confirmed by various analytical techniques and supported by the experimental evidence. Results of the high-temperature studies indicate much reduced capture at these temperatures with negligible selenium sorption above 900{degrees}C. This behavior was attributed to the decomposition of calcium selenite at higher temperatures.

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30 p.

Notes

Ohio Coal Development Office, 77 S. High Street, P.O. Box 1001, Columbus, OH 43266-0001 (United States); OSTI as TI97001484

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  • Other Information: PBD: Mar 1996

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  • Other: TI97001484
  • Report No.: OCDO--97001484
  • DOI: 10.2172/419438 | External Link
  • Office of Scientific & Technical Information Report Number: 419438
  • Archival Resource Key: ark:/67531/metadc684523

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  • March 1, 1996

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  • July 25, 2015, 2:20 a.m.

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Ghosh-Dastidar, A.; Mahuli, S.; Agnihotri, R. & Fan, Liang-Shih. Selenium emission control at high temperatures with mineral sorbents. Final report, September 1, 1994--February 29, 1996, report, March 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc684523/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.