Real-time alkali monitoring system
A fiber optics based optical emission line monitoring system is provided in which selected emission lines, such as the sodium emission line, may be detected in the presence of interfering background radiation. A combustion flame is fed by a diverted portion of a process stream and the common end of a bifurcated or quadfurcated fiber optic light guide is adapted to collect light from the flame. The light is guided through the branches of the fiber optic cable to bandpass filters, one of which is adapted to each of the branches of the fiber optic light guide. The bandpass filters are centered at wavelengths corresponding to the emission lines to be detected and two separate filters are required for each species being detected. The first filter has a bandwidth of about 3 nms and the second filter has a bandwidth of about 10 nms. Light detectors are located to view the light passing through the bandpass filters and amplifiers are connected to receive signals from the light detectors. The amplifier corresponding to the bandpass filter having the narrower bandwidth is preset to scale the signal by a factor equal to the ratio of the wide and narrow bandwidths of the bandpass filters. This scaling produces a scaled signal from which the difference between the scaled signal on the other signal can be calculated to produce a signal having an amplitude directly proportional to the concentration of the species of interest and independent of background radiation. 4 figs., 1 tab.
- Research Organization:
- USDOE Morgantown Energy Technology Center, WV (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- Assignee:
- Dept. of Energy
- Patent Number(s):
- PATENTS-US-A7244759
- Application Number:
- ON: DE91017342; PPN: US 7-244759
- OSTI ID:
- 5399314
- Country of Publication:
- United States
- Language:
- English
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Real-time alkali monitoring system
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20 FOSSIL-FUELED POWER PLANTS
FUEL GAS
ACID NEUTRALIZING CAPACITY
MONITORING
ON-LINE MEASUREMENT SYSTEMS
DESIGN
ACETYLENE
AMPLIFIERS
CALIBRATION STANDARDS
COAL
COMPUTER CALCULATIONS
CORROSION
EQUATIONS
EROSION
FIBER OPTICS
INVENTIONS
NITROUS OXIDE
OPALS
OPTICAL FILTERS
OPTICS
POTASSIUM
SODIUM
TIME DEPENDENCE
TURBINES
ALKALI METALS
ALKYNES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
ELECTRONIC EQUIPMENT
ELEMENTS
ENERGY SOURCES
EQUIPMENT
FILTERS
FLUIDS
FOSSIL FUELS
FUELS
GAS FUELS
GASES
HYDROCARBONS
MACHINERY
MATERIALS
METALS
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ON-LINE SYSTEMS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
STANDARDS
TURBOMACHINERY
WATER CHEMISTRY
440600* - Optical Instrumentation- (1990-)
200104 - Fossil-Fueled Power Plants- Components