Apparatus and method for removing nitrogen oxide from exhaust gas
AssigneeKorea Institute of Machinery & Materials
InventorsHak Joon Kim, Yong-Jin Kim, Bangwoo Han
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Abstract
An exemplary embodiment of the present invention relates to an apparatus and method for removing nitrogen oxide from exhaust gas. The apparatus for removing nitrogen oxide from exhaust gas includes: a chamber through which exhaust gas is introduced and discharged; a nozzle injecting a solution, which reacts with the exhaust gas introduced into the chamber, into the chamber; and an electric dust collecting unit installed at a rear end of the chamber to be supplied with the exhaust gas processed in the chamber and including a discharge unit and a dust collecting unit.
Claims18
An apparatus for removing nitrogen oxide from exhaust gas, comprising:
- a chamber through which exhaust gas is introduced and discharged;
- a nozzle injecting a solution into the chamber, the solution reacting with the exhaust gas introduced into the chamber;
- an electric dust collecting unit installed at a rear end of the chamber to be supplied with the exhaust gas processed in the chamber and including a discharge unit and a dust collecting unit;
- a gas analyzer measuring a concentration of NOx and H2S of the exhaust gas discharged from the electric dust collecting unit;
- and
- a storage tank located under the chamber to store the solution,
- wherein the solution is circulated between the nozzle and the storage tank through a pump.
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.
Dependencies are inferred from the claim text.