Dry ballast separator for pulverised coal - separates pulverised mineral matter by compressed air fluidising of pulverised material

摘要

The separator removes solid mineral ballast from the pulverised coal before the latter is blown into the boiler furnace. The arrangement is used when low grade coal has to be used in boiler operation. The ballast is separated from pulverised coal after it has been ground. The system hence improves the efficiency of the firing system and better utilisation of the fuel. The duct (14) transferring the milled and dried coal to the burner (8) of the boiler furnace has a connected duct (14a) connected toa multistage separator (4). Ballast components are separated in dry state. The pulverised coal is fluidised in the first stage of separator by air in the dry state. The ballast components are separated in relation to their specific weight and grain size range.