Testing of Continuous Sampling Air-ICP and Mercury Systems as Continuous Emission Monitors at the Diagnostic Instrumentation and Analysis Laboratory

Baldwin, David P.; Bajic, Stanley J.; Eckels, D.E.; Zamzow, Daniel S.; Miller, George P.; Tao, Shi Di; Waggoner, Charles A.

doi:10.2172/797627

Cited by 8 publications

(9 citation statements)

References 3 publications

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“…Continuous Sampling System A description of the continuous sampling system developed for this project has been published, 2,3 and is only summarized here. A schematic diagram of the system is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…The differential pressure is monitored using an oil-filled manometer (Dwyer Mercury CEM The Hg CEM system was assembled and tested at Ames Laboratory and used for stack Hg monitoring during an FY00 field test at the Diagnostic Instrumentation and Analysis Laboratory (DIAL) at Mississippi State University. 4 The Hg CEM was modified in FY01 to sequentially monitor elemental and total (oxidized plus elemental) Hg and tested at the EPA-Rotary Kiln in Durham, NC. Mercury is detected as elemental Hg by atomic absorption in a 1-m pathlength absorption cell, using a Hg pen lamp as the light source, a 0.38-m focal-length echelle spectrometer, and a photodiode array (PDA) detector.…”

Section: Wall Of Exhaust Stackmentioning

confidence: 99%

See 1 more Smart Citation

Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility

Baldwin¹,

Bajic²,

Eckels³

et al. 2002

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Section: Methodsmentioning

confidence: 99%

Section: Wall Of Exhaust Stackmentioning

confidence: 99%

Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility

Baldwin¹,

Bajic²,

Eckels³

et al. 2002

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“…Initially, a conventional 1 m monochromator/CCD combination was used to analyse the ICP emissions, but this was later replaced by an échelle/acousto-optic filter (AOTF) spectrometer system [375] for better spectral resolution and coverage as well as multiple element detection capability and suppression of plasma background emissions.…”

Section: Intracavity Plasma E Atomic Emission Spectroscopy (Icp-aes)mentioning

confidence: 99%

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

Monkhouse

2011

Progress in Energy and Combustion Science

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“…The addition of quartz beads or chips will allow the temperature to be elevated to the oven limit of 1100ºC. A previous report 13 of atomizing a gas stream with mercury species indicates a temperature of 1000ºC should be sufficient for pyrolysis. Adjusting the flow rate can be done to ensue enough resident time in the oven for full pyrolysis.…”

Section: Sensor Research and Development Corporation De-fc26-01ft41221mentioning

confidence: 99%

A Cavity Ring-Down Spectroscopy Mercury Continuous Emission Monitor

Carter¹

2004

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Abstract:The Sensor Research & Development Corporation (SRD) has undertaken the development of a Continuous Emissions Monitor (CEM) for mercury based on the technique of Cavity Ring-Down Spectroscopy (CRD). The project involved building an instrument for the detection of trace levels of mercury in the flue gas emissions from coal-fired power plants.The project has occurred over two phases. The first phase concentrated on the development of the ringdown cavity and the actual detection of mercury. The second phase dealt with the construction and integration of the sampling system, used to carry the sample from the flue stack to the CRD cavity, into the overall CRD instrument.The project incorporated a Pulsed Alexandrite Laser (PAL) system from Light Age Incorporated as the source to produce the desired narrow band 254 nm ultra-violet (UV) radiation. This laser system was seeded with a diode laser to bring the linewidth of the output beam from about 150 GHz to less than 60 MHz for the fundamental beam. Through a variety of non-linear optics the 761 nm fundamental beam is converted into the 254 nm beam needed for mercury detection.Detection of the mercury transition was verified by the identification of the characteristic natural isotopic structure observed at lower cavity pressures. The five characteristic peaks, due to both natural isotopic abundance and hyperfine splitting, provided a unique identifier for mercury. SRD scientists were able to detect mercury in air down below 10 parts-per-trillion by volume (pptr). This value is dependent on the pressure and temperature within the CRD cavity at the time of detection. Sulfur dioxide (SO 2 ) absorbs UV radiation in the same spectral region as mercury, which is a significant problem for most mercury detection equipment. However, SRD has not only been able to determine accurate mercury concentrations in the presence of SO 2 , but the CRD instrument can in fact determine the SO 2 concentration as well. Detection of mercury down to the low hundreds of pptr has been accomplished in the presence of SO 2 at concentration levels much higher than that found in typical flue gas emissions. SRD scientists extended the interferent testing to each individual component found in flue gas. It was found that only SO 2 had a significant effect on the ring-down decay curve. Upon completion of testing the components of flue gas individually a simulated flue gas stream was used to test to the CRD instrument. The result showed accurate detection of mercury down to levels below 100 pptr in a simulated flue gas stream with the concentrations of the various components above that found in a typical untreated flue gas.A sampling system was designed and integrated into the CRD instrument to carry the sample from the flue gas stack to the CRD cavity. The sampling system was constructed so that it could be placed very close to the sampling port. SRD scientists were able to couple the UV laser light into an optical fiber, which is then sent to the sampling system. This allows the laser system to b...

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Testing of Continuous Sampling Air-ICP and Mercury Systems as Continuous Emission Monitors at the Diagnostic Instrumentation and Analysis Laboratory

Cited by 8 publications

References 3 publications

Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility

Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

A Cavity Ring-Down Spectroscopy Mercury Continuous Emission Monitor

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