Título

OPERATING EXPERIENCES WITH THE USE OF FABRIC FILTERS AS FINE CLEANING STAGE FOR ALKALIS, DIOXINS, SOx AND HEAVY METALS DOWNSTREAM SINTER PLANTS

Autoria

Margraf, Ruediger

DOI

10.5151/2594-357X-17271

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Resumo

The nowadays requested emission limit values at new and existing plants for the gas cleaning systems downstream sinter strands can often only partly be maintained with the currently installed systems – in most of the cases multiple-stage electric precipitators. Very often the integration of an additional fine cleaning stage becomes necessary for the observance of emission limit values, i.a. for alkalis, dioxins, SOx and heavy metals. With regard to the process technology, dry and conditioned dry procedures have meanwhile become accepted for these applications. In most of the cases, CaO / Ca(OH)2 and activated coke are used as additive powders. All procedures offered on the market use a multiple re-circulation of the particles separated in the filter into the upstream installed reactor, in order to increase the efficiency. A process variant several times realised in the meantime is the LUEHR FILTER Conditioning Rotor – Recycle Process. In Europe four plants are in successful operation and another four sinter strands are now under construction. This lecture introduces two plants in Europe, realised as Conditioning Rotor – Recycle Process: ArcelorMittal Bremen – commissioning in 1993 and Voest Alpine Stahl Donawitz – commissioning in 2002. The operating results of both plants are discussed with regard to the achieved degree of separation for the separate components, the plant availability and the consumption figure for additive.

 

The nowadays requested emission limit values at new and existing plants for the gas cleaning systems downstream sinter strands can often only partly be maintained with the currently installed systems – in most of the cases multiple-stage electric precipitators. Very often the integration of an additional fine cleaning stage becomes necessary for the observance of emission limit values, i.a. for alkalis, dioxins, SOx and heavy metals. With regard to the process technology, dry and conditioned dry procedures have meanwhile become accepted for these applications. In most of the cases, CaO / Ca(OH)2 and activated coke are used as additive powders. All procedures offered on the market use a multiple re-circulation of the particles separated in the filter into the upstream installed reactor, in order to increase the efficiency. A process variant several times realised in the meantime is the LUEHR FILTER Conditioning Rotor – Recycle Process. In Europe four plants are in successful operation and another four sinter strands are now under construction. This lecture introduces two plants in Europe, realised as Conditioning Rotor – Recycle Process: ArcelorMittal Bremen – commissioning in 1993 and Voest Alpine Stahl Donawitz – commissioning in 2002. The operating results of both plants are discussed with regard to the achieved degree of separation for the separate components, the plant availability and the consumption figure for additive.

Palavras-chave

Sinter plant; Emissions; Flue gas treatment; SO2-removal; Dioxin- removal.

Sinter plant; Emissions; Flue gas treatment; SO2-removal; Dioxin- removal.