Characteristics of dioxin emissions from a Waelz plant with acid and basic kiln mode

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Title:	Characteristics of dioxin emissions from a Waelz plant with acid and basic kiln mode
Authors:	張木彬;Hung, Pao Chen;Chi, Kai Hsien;Chen, Mei Lien;Chang, Moo Been
Contributors:	工學院環境工程研究所
Keywords:	activated carbon;adsorbents;Adsorption;Air Pollutants - analysis;Air Pollutants - isolation & purification;Basic kiln mode;Benzofurans - analysis;Benzofurans - isolation & purification;calcium hydroxide;Calcium Hydroxide - chemistry;catalysts;Charcoal - chemistry;Coal Ash - chemistry;Dibenzofurans, Polychlorinated;Dioxins - analysis;Dioxins - isolation & purification;Dust;Electric arc furnaces;Electric filters;Filtration;Flue gases;Flues;Fly ash;gases;Hazardous Waste;Hydrochloric Acid - chemistry;Incineration;Kilns;Metal recovery;Partitioning;PCDD/F;pollutants;polychlorinated dibenzodioxins;Polychlorinated Dibenzodioxins - analogs & derivatives;Polychlorinated Dibenzodioxins - analysis;Polychlorinated Dibenzodioxins - isolation & purification;polychlorinated dibenzofurans;Power plants;Waelz process
Date:	2012-01-30
Issue Date:	2026-04-23 15:00:17 (UTC+8)
Publisher:	Elsevier;Netherlands: Elsevier B.V
Abstract:	摘要： ► Characteristics of PCDD/F emission from Waelz process with acid/basic operating modes are compared. ► Ca(OH) 2 added in basic mode effectively reacted with and HCl (g) and reduced PCDD/F formation. ► Operating the Waelz process in basic more greatly reduced total PCDD/F emissions. ► Total PCDD/F emission is reduced from 640 to 269 ng I-TEQ/kg EAF-dust treated. The concentrations of polychlorinated dibenzo- p-dioxins and dibenzofurans (PCDD/Fs) were measured in the flue gas of a Waelz plant operated in acid and basic modes, respectively. To abate (PCDD/F) and other pollutants, the plant operates with a post-treatment of flue gases by activated carbon injection and subsequent filtration. Relatively high PCDD/F discharge by fly ashes is found with acid kiln mode of the Waelz process. Therefore, basic kiln mode of the Waelz process is investigated and compared in this plant. With the adsorbent injection rate of 7 kg/h (95 mg/Nm 3), the PCDD/F concentration in stack gas was measured as 0.123 ng I-TEQ/Nm 3 in the basic operating mode. The added Ca(OH) 2 reacted with metal catalysts and HCl (g) in the flue gas and thus effectively suppressed the formation of PCDD/Fs. PCDD/F concentrations in fly ashes sampled from the dust settling chamber, cyclone, primary filter and secondary filter in basic kiln mode were significantly lower than that in acid kiln mode. Total PCDD/F emission on the basis of treating one kg of electric arc furnace dust in the basic operation mode was 269 ng I-TEQ/kg EAF-dust treated which was significantly lower than that in acid mode (640 ng I-TEQ/kg EAF-dust treated). 其他題名： J Hazard Mater 出版者： Netherlands: Elsevier B.V 出版日期： 2012-01-30 出處： Journal of hazardous materials, 2012-01, Vol.201 (30), p.229-235 版權： 2011 Elsevier B.V. 版權： Copyright © 2011 Elsevier B.V. All rights reserved. 識別號： ISSN: 0304-3894 識別號： ISSN: 1873-3336 識別號： EISSN: 1873-3336 識別號： DOI: 10.1016/j.jhazmat.2011.11.075 識別號： PMID: 22178278
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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