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04 December 2009

Hoval has launched its new CF ceramic filter for filtering particulate emissions from any make of new or existing biomass boiler. Capable of removing up to 96% of particles down to a diameter of 2.5 microns (PM2.5), the CF allays many of the current concerns about particulate emissions from biomass installations.

When EC Directive 2008/50/EC, Ambient Air Quality and Cleaner Air for Europe, comes into force in June 2010 it could create a difficult situation for biomass boilers. This is because the Directive seeks to create a control framework for particulate emissions down to PM2.5, and the current cyclone and multi-cyclone technologies only remove particles down to 10 microns (PM10). Potentially, this could severely curtail the use of biomass in the UK and some local authorities are already considering a ban.

The Hoval CF contains a matrix of porous ceramic tubes which are closed at the lower end. As flue gases are drawn through the filter by an inline fan, the gases are able to pass through the walls of the ceramic tubes, while particles are trapped. At regular intervals (timed and/or in response to a pressure drop across the filter) a pulse of air is used to dislodge the particles, which fall into a collection bin.

The CF has been developed from technologies widely used in the aluminium smelting industry, and optimised for use with biomass boilers.

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