Process for reducing the emission of pollutants in combustion devices with circulating fluidised bed.

摘要

Process for reducing emissions of pollutants in a combustion plant with a circulating fluidised bed, comprising a hearth (1) from which the dust is recovered at least partially by a cyclone (12), the gases partially stripped of dust leaving this cyclone (12) flowing into a recovery boiler (3) and then into a dust remover (7), and according to which a desulphurising agent is introduced into the hearth (1). According to the invention, downstream of the said recovery boiler (3) and upstream of the dust remover (7) the flue gases are desulphurised by a semiwet route in a reaction vessel (4) equipped with water injection (5). Downstream of the said dust remover (7) the desulphurisation products obtained are oxidised thermally. <IMAGE>