Evaluation of near-infrared tunable diode lasers for detection of transient emissions from a rotary kiln.

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Near-infrared tunable diode lasers (TDLs) were evaluated for their suitability as fast-response combustion performance indicators during tests at the U.S. Environmental Protection Agency's pilot-scale Rotary Kiln Incinerator Simulator (RKIS) facility. Transient emissions (i.e., 'puffs') of various magnitudes and duration were generated by injecting a mixture of toluene and methylene chloride into the rotary kiln, through use of a computer-controlled liquid gun or by ram-loading containers of the waste surrogate adsorbed onto corncob. Two wavelength-modulated TDLs that span carbon monoxide (CO) and methane absorption lines at 1.57 and 1.65 pm, respectively, provided information on these species as well as total laser ... continued below

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28 p.

Creation Information

Shaddix, Christopher R.; Ottesen, David K.; Allendorf, Sarah W.; Miller, C. Andy (U.S. Environmental Protection Agency, Research Triangle Park, NC) & Lemieux, Paul M. (U.S. Environmental Protection Agency, Research Triangle Park, NC) December 1, 2003.

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Description

Near-infrared tunable diode lasers (TDLs) were evaluated for their suitability as fast-response combustion performance indicators during tests at the U.S. Environmental Protection Agency's pilot-scale Rotary Kiln Incinerator Simulator (RKIS) facility. Transient emissions (i.e., 'puffs') of various magnitudes and duration were generated by injecting a mixture of toluene and methylene chloride into the rotary kiln, through use of a computer-controlled liquid gun or by ram-loading containers of the waste surrogate adsorbed onto corncob. Two wavelength-modulated TDLs that span carbon monoxide (CO) and methane absorption lines at 1.57 and 1.65 pm, respectively, provided information on these species as well as total laser transmittance (an indicator of soot loading). Fiber-optic cables transmitted the laser light from the remotely situated TDLs to two line-of-sight measurement locations. In addition, the TDLs were used with a multi-pass optical cell to perform more sensitive extractive measurements. Over the optical pathlength available in this facility, in situ measurements of methane down to a concentration of {approx} 100 ppm were demonstrated during non-sooty conditions. CO could not be reliably quantified in situ, even at concentrations as high as 0.7%, due to the combination of weak absorption line strength and interfering water and carbon-dioxide hot-bands. The soot produced during the toluene/methylene chloride puffs typically attenuated over 90% of the TDL laser beam, preventing effective in situ TDL measurements during the puffs. In contrast, the extractive TDL measurements demonstrated good accuracy and sensitivity for both methane and CO under all reactor conditions. Furthermore, the in situ laser transmittance profiles during the puffs provided new insights into the composition of the puffs as a function of puff magnitude and residence time.

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28 p.

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  • Report No.: SAND2003-8721
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/918248 | External Link
  • Office of Scientific & Technical Information Report Number: 918248
  • Archival Resource Key: ark:/67531/metadc877673

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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.

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Creation Date

  • December 1, 2003

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

Description Last Updated

  • Dec. 5, 2016, 3:22 p.m.

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Shaddix, Christopher R.; Ottesen, David K.; Allendorf, Sarah W.; Miller, C. Andy (U.S. Environmental Protection Agency, Research Triangle Park, NC) & Lemieux, Paul M. (U.S. Environmental Protection Agency, Research Triangle Park, NC). Evaluation of near-infrared tunable diode lasers for detection of transient emissions from a rotary kiln., report, December 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc877673/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.