Method of decreasing nitrogen oxides in combustion device which performs continuous combustion, and apparatus therefor

An apparatus for reducing nitrogen oxides from a combustion exhaust gas comprising:

• a combustion chamber;
• a first supply means for supplying said combustion chamber with fuel and air;
• an exhaust gas passageway for discharging exhaust gas produced by combustion of said fuel in said combustion chamber;
• a catalytic means arranged in said element exhaust passageway for purging toxic components contained in the exhaust gas discharged;
• and
• a second supply means for supplying reformed gas produced by a steam reforming process to contact with said exhaust gas which enters said catalytic means, said second supply means comprising:
• a deionized-water supply means for supplying deionized water;
• a mixing means for mixing the deionized water from said deionized-water supply means with fuel from said first supply means;
• a steam reformer, which is supplied with the mixture of deionized water and fuel from said mixing means, mounted in said combustion chamber at a position where a predetermined temperature will be attained;
• and
• hot- and cold-shift converters connected to a water-vapor modifying means for producing reformed gas that is supplied to the exhaust gas in said exhaust passageway.