Establishing isokinetic flow for a plasma torch exhaust gas diagnostic for a plasma hearth furnace

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Real time monitoring of toxic metallic effluents in confined gas streams can be accomplished through use of Microwave Induced Plasmas to perform atomic emission spectroscopy, For this diagnostic to be viable it is necessary that it sample from the flowstream of interest in an isokinetic manner. A method of isokinetic sampling was established for this device for use in the exhaust system of a plasma hearth vitrification furnace. The flow and entrained particulate environment were simulated in the laboratory setting using a variable flow duct of the same dimensions (8-inch diameter, schedule 40) as that in the field and was ... continued below

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107 p.

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Pollack, B.R. May 1, 1996.

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Real time monitoring of toxic metallic effluents in confined gas streams can be accomplished through use of Microwave Induced Plasmas to perform atomic emission spectroscopy, For this diagnostic to be viable it is necessary that it sample from the flowstream of interest in an isokinetic manner. A method of isokinetic sampling was established for this device for use in the exhaust system of a plasma hearth vitrification furnace. The flow and entrained particulate environment were simulated in the laboratory setting using a variable flow duct of the same dimensions (8-inch diameter, schedule 40) as that in the field and was loaded with similar particulate (less than 10 {mu}m in diameter) of lake bed soil typically used in the vitrification process. The flow from the furnace was assumed to be straight flow. To reproduce this effect a flow straightener was installed in the device. An isokinetic sampling train was designed to include the plasma torch, with microwave power input operating at 2.45 GHz, to match local freestream velocities between 800 and 2400 ft/sec. The isokinetic sampling system worked as planned and the plasma torch had no difficulty operating at the required flowrates. Simulation of the particulate suspension was also successful. Steady particle feeds were maintained over long periods of time and the plasma diagnostic responded as expected.

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107 p.

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OSTI as DE97053621

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  • Other Information: TH: Thesis (Ph.D.)

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  • Other: DE97053621
  • Report No.: DOE/OR/00033--T744
  • Grant Number: AC05-76OR00033
  • Office of Scientific & Technical Information Report Number: 582269
  • Archival Resource Key: ark:/67531/metadc692687

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Office of Scientific & Technical Information Technical Reports

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  • May 1, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 19, 2016, 1:24 p.m.

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Pollack, B.R. Establishing isokinetic flow for a plasma torch exhaust gas diagnostic for a plasma hearth furnace, thesis or dissertation, May 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc692687/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.