METHOD FOR REDUCING NITROGEN OXIDE EMISSION FROM PULVERIZED COAL COMBUSTION SYSTEMS FOR STEAM GENERATORS WITH DRY ASH REMOVAL

摘要

The method reduces emission of nitrogen oxides from a steam-generator firing system using pulverised coal and with dry ash extraction. Carbonaceous material is delivered into a fluidised bed (2) at the funnel outlet (1) from the combustion chamber, where it undergoes substochiometric combustion. The fine grains separated from the subsequent fluidised-bed ash sifter (3) are returned to the bed (2). Combustion in the fuel bed is regulated separately from the main combustion system (4). USE/ADVANTAGE - Pulverised coal combustor system keeps NOX emission below prescribed level even when the load alters or mills are cut in and out of use.