Reduction of dioxin emission by a multi-layer reactor with bead-shaped activated carbon in simulated gas stream and real flue gas of a sinter plant

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Title:	Reduction of dioxin emission by a multi-layer reactor with bead-shaped activated carbon in simulated gas stream and real flue gas of a sinter plant
Authors:	Hung,PC;Lo,WC;Chi,KH;Chang,SH;Chang,MB
Contributors:	環境工程研究所
Keywords:	WASTE INCINERATOR;ADSORPTION;PCDD/F;REMOVAL;DISTRIBUTIONS;CATALYSTS;PHASES;AIR
Date:	2011
Issue Date:	2012-03-27 17:05:11 (UTC+8)
Publisher:	國立中央大學
Abstract:	A laboratory-scale multi-layer system was developed for the adsorption of PCDD/Fs from gas streams at various operating conditions, including gas flow rate, operating temperature and water vapor content. Excellent PCDD/F removal efficiency (>99.99%) was achieved with the multi-layer design with bead-shaped activated carbons (BACs). The PCDD/F removal efficiency achieved with the first layer adsorption bed decreased as the gas flow rate was increased due to the decrease of the gas retention time. The PCDD/F concentrations measured at the outlet of the third layer adsorption bed were all lower than 0.1 ng I-TEQ Nm(-3). The PCDD/Fs desorbed from BAC were mainly lowly chlorinated congeners and the PCDD/F outlet concentrations increased as the operating temperature was increased. In addition, the results of pilot-scale experiment (real flue gases of an iron ore sintering plant) indicated that as the gas flow rate was controlled at 15 slpm, the removal efficiencies of PCDD/F congeners achieved with the multi-layer reactor with BAC were better than that in higher gas flow rate condition (20 slpm). Overall, the lab-scale and pilot-scale experiments indicated that PCDD/F removal achieved by multi-layer reactor with BAC strongly depended on the flow rate of the gas stream to be treated. (C) 2010 Elsevier Ltd. All rights reserved.
Relation:	CHEMOSPHERE
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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