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Mr. Hardy
To ask the Secretary of State for Energy what assessment he has made of the effectiveness of solid ceramic-based candle filters in dealing with dust within and from industrial plant flues.
Mr. Heathcoat-Amory
British Coal has undertaken extensive work to develop candle filters for cleaning dust from pressurised combustors such as utilised at the Grimethorpe fluidised bed installation. Information on its work is within the public domain. British Coal has not funded comparable activity of non-utility scale industrial plant where it is felt candle filters would probably not be economic compared with current established technology.