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Environ Sci Technol

Title:		Temperature control during regeneration of activated carbon fiber cloth with resistance-feedback
Author(s):		Johnsen DL; Rood MJ;
Address:		"Department of Civil and Environmental Engineering, University of Illinois, 205 North Mathews Avenue, Urbana, Illinois 61801, USA"
Journal Title:		Environ Sci Technol
Year:		2012
Volume:		20121005
Issue:		20
Page Number:		11305 - 11312
DOI:		10.1021/es303099t
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Electrothermal swing adsorption (ESA) of organic compounds from gas streams with activated carbon fiber cloth (ACFC) reduces emissions to the atmosphere and recovers feedstock for reuse. Local temperature measurement (e.g., with a thermocouple) is typically used to monitor/control adsorbent regeneration cycles. Remote electrical resistance measurement is evaluated here as an alternative to local temperature measurement. ACFC resistance that was modeled based on its physical properties was within 10.5% of the measured resistance values during electrothermal heating. Resistance control was developed based on this measured relationship and used to control temperature to within 2.3% of regeneration set-point temperatures. Isobutane-laden adsorbent was then heated with resistance control. After 2 min of heating, the temperature of the adsorbent with isobutane was 13% less than the adsorbent without isobutane. This difference decreased to 2.1% after 9 min of heating, showing desorption of isobutane. An ACFC cartridge was also heated to 175 degrees C for 900 cycles with its resistance and adsorption capacity values remaining within 3% and 2%, respectively. This new method to control regeneration power application based on rapid sensing of the adsorbent's resistance removes the need for direct-contact temperature sensors providing a simple, cost-efficient, and long-term regeneration technique for ESA systems"
Keywords:		"Adsorption Air Pollutants/analysis/chemistry Carbon/*chemistry Carbon Fiber Environmental Restoration and Remediation/instrumentation/methods Models, Chemical *Temperature Volatile Organic Compounds/analysis/chemistry;"
Notes:		"MedlineJohnsen, David L Rood, Mark J eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2012/09/13 Environ Sci Technol. 2012 Oct 16; 46(20):11305-12. doi: 10.1021/es303099t. Epub 2012 Oct 5"