Reduction PCDD/F and Heavy Metals by Using Activated Lignite, HOK (Application for Sinter Plant and EAF)

Posted on 08 February 2013
 

Reduction PCDD/F and Heavy Metals by Using Activated Lignite, HOK (Application for Sinter Plant and EAF)
Reduction PCDD/F and Heavy Metals by Using Activated Lignite, HOK (Application for Sinter Plant and EAF) BY O JOON KWON*,JUERGEN WIRLING** SYNOPSIS The environmental regulation in EU for the steel industry from sinter plant and electric arc furnace set a schedule for emission limit as 0.4 ngTEQ/nm3 for sinter strand , and 0.1 ngTEQ/nm3 for EAF, and it is going to point out for the huge amount of exhaust gas from the process which contains also the most toxic component like, PCDD/F and Heavy Metals. This heightens the need for the timely identification and demonstration of cost-effective PCDD/F and heavy metal control technologies for retrofit application to existing sinter plant and EAF. Complex technologies that involve high investment of operating costs or create solid waste management problems are unlikely to find commercial application. Faced with increasing pressure to control costs generators need to demonstrated process engineering solutions that avoid or minimized these disadvantages. RWE Power AG, Germany has demonstrated a simple and effective PCDD/F and heavy metal control process in Europe that is well studied to help meet the environmental emission control requirement in E.U. Extensive measurements performed during sinter and EAF process in well-known more than 12 industrial plants including Thyssen Steel, Arcelor Mittal Steel have shown that process integrated entrained-phase adsorption using activated lignite HOK constitutes a technical reliable, ecologically reasonable and , same time, low-cost solution ensuring compliance with the limit values. Depends an existing process dust filtration equipment, effective solution using different type of activated lignite can ensure efficient emission reduction and its the separation efficiency. On this article, following interesting subjects will be described. - Tendency and Requirement of EU regulation for the Steel Industry. - Case studies in existing plants. - Process applications of activated lignite HOK - Consideration for the metal dust To facilitate efficient and cost-effective mercury control, RWE developed adsorbent process and injection technology using activated lignite HOK which is less expensive than activated carbon and is just as effective HOK has been used in RWE plants since 1999 and has been used in a 2 x 400 MW coal-fired power plant in the USA since January 2007,as well. 2011 ESCO Seminar

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