METHOD AND MEANS FOR CONTROLLING THE OPERATION OF FLUIDISED BED COMBUSTION APPARATUS

摘要

In a fluidised bed combustion apparatus the supply of combustion air (19) fed to the apparatus to fluidise the bed (11) and to support combustion is augmented by inert gas (26), preferably apparatus exhaust gas. The proportion of inert gas is determined by the quantity supplied by a valve (27) to a mixer (23) supplying the mix of fluidising gases to tubes (12). Operation of the bed is controlled by a sensor 22 responsive to the thermal demand of the apparatus and by a sensor 30 responsive to the temperature of the bed. Sensor 22 controls fuel supply by a feeder (16) and combustion air supplied by a valve 21 to the mixer (23) and to a valve (31) for supplying air above the bed. Sensor 30 controls the proportion of inert gas in the mixer and the degree of opening of valve 31 supplying combustion air above the bed. IMAGE