Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Reexamination Certificate
2006-04-11
2006-04-11
Evans, F. L. (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
C250S458100
Reexamination Certificate
active
07027150
ABSTRACT:
Corrosion of refractory silica brick and air quality issues due to particulate emissions are two important glass manufacturing issues that have been tied to sodium vapor and its transport throughout the melt tank. Knowledge of the relationship between tank operating conditions and tank atmosphere sodium levels are therefore important considerations in correcting corrosion and air quality issues. However, until recently direct quantitative measurements of sodium levels has been limited to extractive sampling methods followed by laboratory analysis. Excimer laser induced fragmentation (ELIF) fluorescence spectroscopy is a technique that permits the measurement of volatilized NaOH in high temperature environments on a timescale of less than one second. The development of this method and the construction of field-portable instrumentation for glass furnace applications are herein disclosed. The method is shown to be effective in full-scale industrial settings. Characteristics of the method are outlined, including equipment configuration, detection sensitivity, and calibration methodology.
REFERENCES:
Damm et al, Excimer laser fragmentaton-fluorescence spectroscopy as a method for monitoring ammonium nitrate and ammonium sulfate particles, Chemosphere, vol. 42, issue 5-7, Feb. 2001, pp. 655-661.
Gottwald et al, Simultaneous detection of nickel and potassium in the flue gas of a fluidised bed coal combustor by excimer laser-induced fragmentation fluorescence, Fuel Processing Technology, vol. 80, issue, 2, Feb. 15, 2003, pp. 143-153.
Monkhouse et al, Phase discrimination of alkali species in PCFB combustion flue gas using simultaneous monitoring by surface ionisation and photofragmentation fluorescence, Fuel, vol. 82, issue 4, Mar. 4, 2003, pp. 365-371.
Allendorf Mark D.
Rice Steven F.
Evans F. L.
Evans Timothy P.
Sandia National Laboratories
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