METHOD FOR STEPWISE BURNING OF FUEL IN BOILER WITH COOLED COMBUSTION CHAMBERS AND FIRE TUBES Russian patent published in 2003 - IPC

FIELD: furnace equipment, applicable in heating, heat cumulative and steam power systems. SUBSTANCE: the method of stepwise burning of fuel in a boiler with cooled combustion chambers and fire tubes is perfected by its exothermic interaction with oxygen of the primary portion of air in the combustion chamber, final oxidation of the formed products of incomplete combustion by the jets of the secondary portion of air in the exhaust port of the combustion chamber and cooling of flue gases in the system of water-cooled fire tubes. The process of the exothermic reacting is accomplished in the fire tubes, and the air jets with oxygen for the process of the secondary thermal reactions are introduced tangentially to the circumference in the center of the inlet section of the system of fire tubes. EFFECT: enhanced efficiency of water heating and steam generation at a low exhaust of nitrogen oxides into the atmosphere. 5 dwg