Nitrogen oxide reduction type regenerative thermal oxidation system and nitrogen oxide reduction method thereof

A nitrogen oxide reduction type regenerative thermal oxidation system comprising:

• a first reduction device for primarily reducing nitrogen oxides generated by a regenerative thermal oxidation device based on a selective non-catalytic reduction method;
• an exhaust gas storage device for storing the exhaust gas being discharged from the first reduction device;
• a second reduction device for secondarily reducing nitrogen oxides based on a selective catalytic reduction method for an exhaust gas stored in the exhaust gas storage device;
• and
• a suction and discharge device for sucking in the exhaust gas with secondarily reduced nitrogen oxides from the exhaust gas storage device and discharging it into the atmosphere,
• wherein the first reduction device sprays a reduction agent on the regenerative thermal oxidation device through a plurality of atomizers installed on the upper inner wall of the regenerative thermal oxidation device,
• wherein the exhaust gas storage device stores the cooled gas after waste heat is recovered by the regenerative thermal oxidation device,
• wherein the second reduction device supplies a reduction agent to the exhaust gas storage device, and adjusts the input flow rate and the input amount of the reduction agent according to the amount of the nitrogen compound contained in the exhaust gas being discharged from the regenerative thermal oxidation device, and
• wherein the suction and discharge device sucks the exhaust gas stored in the exhaust gas storage device.