Patent ID: 11883781
Assignee: KOREA INSTITUTE OF MACHINERY & MATERIALS
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 14:
15. A method of removing nitrogen oxide from exhaust gas, comprising:
introducing the exhaust gas into a chamber;
removing the nitrogen oxide by spraying a solution into the chamber; and
collecting an acidic material particle in an electric dust collecting unit and removing the acidic material particle from the exhaust gas,
wherein in the removing of the nitrogen oxide,
a reducing agent made of sodium thiosulfate (Na2S2O3) and sodium sulfite (Na2SO3) mixed in a one-to-one mass ratio is sprayed into the chamber to react the reducing agent with the nitrogen dioxide contained in the exhaust gas, and
the reducing agent controls input timing and an input amount according to the set reference value of NOx removal rate or a set reference value of H2S generation concentration.