Circulating Fluidized-Bed combustion (CFB) technology
CFB is a well proven technology suitable for medium size (less than 300 MW) coal-fired plants located inland, i.e it does not require the availability of seawater for flue gas desulphurisation. For the purposes of this study, we assume that a prospective developer of a CFB plant would optimise the plant to incorporate the following design features:
• Injection of sorbent into the boiler to control sulphur emissions, with sorbent recirculation from the bag filter to enhance utilization.
• Use of bag filters to control the emission of particulates and enhance sulphur capture. It is our view that a coal-fired CFB plants constructed today will be of the subcritical type, which has an overall net efficiency of about 38 per cent. In the future, supercritical steam conditions will likely be employed for larger plants resulting in an overall efficiency gain equivalent to about 2 percentage points.
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