Energy-saving type dielectric barrier discharge plasma nox reduction device

Abstract

Disclosed is a nitrogen oxide reduction device using dielectric barrier discharge plasma. The plasma nitrogen oxide reduction device may limitedly emit nitrogen oxide with a form of NO 2 at a final outlet of the plasma nitrogen oxide reduction device by arranging a combustion unit, a wet treatment unit, and a plasma oxidizing unit in a housing. The emitted nitrogen oxide is finally treated in a wet scrubber operated as a reducer at a final exhaust end.

What is claimed is: 
     
         1 . An energy saving-type DBD plasma nitrogen oxide reduction device configured to treat waste gas, comprising:
 a combustion unit combusting the waste gas;   a wet treatment unit configured to receive the combusted gas from the combustion unit and perform wet treatment on the gas; and   a plasma oxidizing unit arranged to insert plasma gas for treating nitrogen oxide included in the gas passing through the wet treatment unit.   
     
     
         2 . The device of  claim 1 , further comprising a housing, wherein the combustion unit, the wet treatment unit, and the plasma oxidizing unit are arranged in the housing. 
     
     
         3 . The device of  claim 2 , further comprising a main emission tube configured to emit the nitrogen oxide, treated by the plasma gas, to outside of the housing, wherein the plasma oxidizing unit is connected and mounted to a connection path connected to the main emission tube in the housing. 
     
     
         4 . The device of  claim 1 , wherein the plasma gas is O 3  generated through plasma discharge of the plasma oxidizing unit. 
     
     
         5 . The device of  claim 4 , wherein the nitrogen oxide is converted into NO 2  by oxidizing with O 3  generated in the plasma oxidizing unit. 
     
     
         6 . The device of  claim 5 , wherein the converted NO 2  is treated through a reduction reaction in a wet treatment process which is a post treatment process. 
     
     
         7 . The device of  claim 1 , wherein the plasma oxidizing unit comprises a rod-shaped internal electrode, a dielectric configured to surround the internal electrode, and an external electrode inserted and mounted into an outer part of the dielectric in a coil form, wherein the internal electrode and the external electrode are applied with alternating current power for generation of plasma. 
     
     
         8 . The device of  claim 7 , wherein the external electrode has a surface coated with thermal spraying. 
     
     
         9 . The device of  claim 7 , wherein an external surface of dielectric and an external surface of external electrode are formed at the same height. 
     
     
         10 . The device of  claim 1 , wherein the plasma oxidizing unit is configured to generate plasma using DBD plasma.