The majority of boiler pulverised fuel grit and ash hoppers, bunkers and silos in power stations around the world are designed on cement plant technology. In essence this means that they are invariably core flow having shallow wall slopes and small outlets. Whilst mass flow technology, based on the flow properties of the stored materials, has been reasonably well applied to power station coal handling systems (1) there has been little or no application in the area of collection and conditioning of particulate products of combustion. This paper gives details of how mass and core flow design principles have been combined (2), in geometrically restricted economiser hopper locations, to eliminate blockage thus providing trouble free operation with minimum maintenance. This forms part of the Ironbridge Power Station's on-going environmental improvement policy.
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