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The precipitation of sticky and ultrafine particles has become increasingly important. Biomass burners are one important example for ultrafine dust emission sources with ever growing importance. Therefore, a baghouse filter has been developed, which combines excellent separation efficiency (> 99%, clean air dust loading of Therefore, extended tests on recycling of used precoat material have been performed. Particularly, the influence of precoat injection parameters and various mixing strategies of used and virgin powder for refreshing the precoat material have been investigated. Different mixtures have been characterised by their ability to disintegrate, flowability and filtration behaviour. It is clearly demonstrated that upon redispersing the used precoat fine dust mainly adheres to the coarse precoat with only a limited number of dust agglomerates being produced in addition. For each kind of precoat a minimum amount is determined in order to ensure a long-term stable process. This way a saving potential of between 40–67% has been found. An economic and ecologic process has been developed to precipitate ultrafine dust in a baghouse filter system using precoat materials.

Zur Erfullung der Anforderungen der novellierten ersten Bundesimmissionsschutzverordnung (1. BImSchV: Verordnung uber kleine und mittlere Feuerungsanlagen) wurde ein Schlauchfiltersystem fur den Gebrauch in kleinen und mittleren Feuerungsanlagen entwickelt. Ein zur Filtration benotigtes Filterhilfsmittel wird vollautomatisch portioniert, dispergiert und dem Prozess zugefuhrt. Mit dieser Technik ist es moglich, den Feinstaubgehalt im Abgas auf unter 1 mg m–3 i.N. zu senken und damit die geforderten Grenzwerte weit zu unterschreiten. To comply with the legal requirements in Germany a baghouse filter system for small and medium-sized wood-fired heaters has been developed. For the filtration a precoat material is required, which is automatically portioned, dispersed, and injected. With this technology it is possible to minimize the fine dust concentration in the waste gas below 1 mg m–3 at standard conditions and to fall far below the legal requirements.