Process and apparatus for combustion of liquid and gaseous fuels with nitric oxide-free exhaust gas

An apparatus for nitric oxide-free combustion of fuel comprising:

• a first combustion chamber having a combustion zone, a means for introducing a fuel and air mixture into said combustion zone, a means for igniting said fuel and air mixture thereby forming a hot combustion gas, a means associated with the wall of said combustion chamber for partially cooling said combustion gas, a means for mixing said partially cooled combustion gases with additional fuel after said combustion, a catalyst for reacting with said partially cooled combustion gases mixed with said additional fuel to form a fission gas, said air introduced into said combustion chamber being insufficient to react with said fuel;
• a second combustion chamber;
• a first conduit for transporting part of said fission gas to a second combustion chamber;
• said second combustion chamber including means for introducing more than sufficient air for the complete combustion of said part of said fission gas into a combustion zone therein, a means for igniting said part of said fission gas in said combustion zone;
• a second conduit for transporting the remainder of said fission gas to said second combustion chamber after said combustion zone therein;
• and
• said second combustion chamber further having a means for mixing the combusted part of said fission gas and said remainder of said fission gas and reacting said mixing with a catalyst thereby forming a slightly overstoichiometric flue gas.