High Temperature Millimeter Wave Radiometric and Interferometric Measurements of Slag-Refractory Interaction for Application to Coal Gasifiers |
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Authors: | John S McCloy Jarrod V Crum S K Sundaram Ryan Slaugh Paul P Woskov |
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Affiliation: | (1) Pacific Northwest National Laboratory, 902 Battelle Blvd, MSIN K6-24, PO Box 999, Richland, WA 99352, USA;(2) Kazuo Inamori School of Engineering, Alfred University, Alfred, NY 14802, USA;(3) Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |
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Abstract: | Millimeter wave (MMW) radiometry can be used for simultaneous measurement of emissivity and temperature of materials under
extreme environments such as in slagging coal gasifiers, where sensors have been identified as a key enabling technology need
for process optimization. We present a dual-channel MMW heterodyne radiometer with active interferometric capability that
allows simultaneous measurements of sample temperature, emissivity, and flow dynamics. Interferometric capability at 137 GHz
is supplied via a probe signal originating from a local oscillator allowing monitoring of sample dynamics such as volume expansion
and thickness change. This capability has been used to monitor characteristic behavior between refractories and slag such
as slag infiltration, slag melting, viscous flow, foaming, and crucible corrosion by the molten slag. These results show the
promise of the MMW system for extracting process parameters from operating slagging coal gasifiers, providing valuable information
for process efficiency, control, and increased productivity. |
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