Process monitoring and control: Ammonia measurements in off-gases

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Description

This interim report describes technical progress in the development of a laser-based, real-time optical monitor for ammonia in off-gas streams from defense waste processing applications at the Savannah River Site (SRS). An optimized monitor has been fabricated by Spectrum Diagnostix using a tunable diode laser operating in the 1.55-{mu}m wavelength region. Instrument detection limits of 2-3 ppm for ammonia are demonstrated that are more than adequate for the SRS required sensitivity of 10 ppm. Laboratory research at Sandia revealed a lack of interference at the operating wavelength by other molecular species that might be present in the SRS off-gas stream. ... continued below

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21 p.

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Allendorf, S.; Ottesen, D.; Johnson, H. & Lambert, D. May 1, 1997.

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Description

This interim report describes technical progress in the development of a laser-based, real-time optical monitor for ammonia in off-gas streams from defense waste processing applications at the Savannah River Site (SRS). An optimized monitor has been fabricated by Spectrum Diagnostix using a tunable diode laser operating in the 1.55-{mu}m wavelength region. Instrument detection limits of 2-3 ppm for ammonia are demonstrated that are more than adequate for the SRS required sensitivity of 10 ppm. Laboratory research at Sandia revealed a lack of interference at the operating wavelength by other molecular species that might be present in the SRS off-gas stream. Initial tests of the ammonia monitor by Sandia were conducted at SRS using a bench-scale processing system for surrogate defense waste sludges. The results of these experiments confirmed that ammonia concentrations issuing from the ammonia-scrubber section of the bench-scale reactor were below the design limit of 10 ppm. We also found that no other molecular species in the off-gas produced observable false-positive readings from the monitor. 5 refs., 6 figs.

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21 p.

Notes

OSTI as DE97053781

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  • Other Information: PBD: May 1997

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  • Other: DE97053781
  • Report No.: SAND--97-8258
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/552756 | External Link
  • Office of Scientific & Technical Information Report Number: 552756
  • Archival Resource Key: ark:/67531/metadc695717

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 3, 2015, 6:15 p.m.

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Allendorf, S.; Ottesen, D.; Johnson, H. & Lambert, D. Process monitoring and control: Ammonia measurements in off-gases, report, May 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc695717/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.