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Abstract

The aim of the project is to demonstrate the feasibility of dioxine removal from sinter plant off-gas by means of a special regenerative thermal oxidiser. This oxidiser makes use of a new regenerator (known as a 'pebble heater') from which efficient low-price dioxin destruction can be expected due to : long residence time in the high temperature zone, high heat regeneration efficiency, i.e. low energy consumption, rapid cooling (quenching) of the off-gas. A demonstration facility with 10 000 m3 (STP)/h was designed, constructed and installed in by-pass on a sinter plant. In trial campaigns several operational parameters (reaction temperature, residence time, specific flow rate) were varied. The experiments showed a pronounced temperature effect for the removal of dioxins. This effect is mainly caused through adsorption/desorption effects combined with the fact that clean gas temperature is higher than crude gas temperature (a general feature of thermal oxidisers). For further investigation, the crude gas temperature was varied. Lower crude gas temperature (~80 °C) showed improved dioxin removal. In this case, of course, pronounced memory effects occurred upon lifting the temperature back to normal values (170 °C). Higher crude gas temperature (205 °C) showed dioxin formation rather than dioxin removal. Here, heating of the crude gas obviously shifted reactions from the regime of adsorption/desorption into the regime of DeNovo synthesis. The pilot plant could be operated in autothermal mode, i.e. heat losses are covered from the heat generated in thermal oxidation of the off-gas. Furthermore, it performed well for removing dust, PAH and SO2.

Additional information

Authors: ARLT K J, AG der Dillinger Hüttenwerke, Dillingen/Saar (DE);GÜNTHER C, Saarstahl, Völklingen (DE);STEVANOVIC D, Sulzbach-Rosenberg (DE)
Bibliographic Reference: EUR 22031 EN (2006), 34 pp. Euro: 15
Availability: Katalogue Number: KI-NA-22031-EN-S The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN: 92-79-01373-4
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