Oxyfuel fluidized bed combustion

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Oxyfuel Technology is one of the few potential technologies that can offer pure streams of CO2 from the combustion of fossil fuels for sequestration. The technology has now advanced to the stage of demonstration in using conventional suspension fired technology, and there are plans to build units as large as 600 MWe. Oxyfuel Circulating Fluidized Bed Combustion (CFBC) is by contrast a largely unexplored technology, which has a large number of potential advantages over conventional coal burning even in the oxygen fired mode. First, Circulating Fluidized Beds are able to burn a large range of fuels, and co-fire with biomass over any desired range, which offers the possibility of using such seasonally available fuels in a CO2 negative fashion. Second, because of the fact that CFBC circulate large amounts of solids it is possible to reduce the amount of flue gas being recycled thus allowing a size reduction of the boiler by up to 30%, and finally the technology is extremely fuel flexible thus allowing a complete range of Canadian feedstocks from asphaltenes, petroleum cokes, waste coal and lignitic fuels to be used in a given unit. At the moment CANMET is in discussions with both Foster Wheeler who are schedule to build a full-scale demonstration unit in 2011, and the Canadian Clean-Coal Power Coalition to support these developments.