Process monitoring and control: Ammonia measurements in off-gases
- Sandia National Labs., Livermore, CA (United States)
- Westinghouse Savannah River Company, Aiken, SC (United States)
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.
- Research Organization:
- Sandia Labs., Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 552756
- Report Number(s):
- SAND-97-8258; ON: DE97053781; TRN: 97:005920
- Resource Relation:
- Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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