Nitrogen oxide reduction apparatus and gas treating apparatus

A gas treating apparatus comprising:

• a reaction chamber configured to process a gas supplied from an outside by a plasma;
• a nitrogen oxide reduction apparatus connected to the reaction chamber;
• and
• a misting pipe configured to receive the processed gas from the nitrogen oxide reduction apparatus, the misting pipe comprising at least one water injection nozzle,
• wherein the nitrogen oxide reduction apparatus includes a cooling unit,
• wherein the nitrogen oxide reduction apparatus is configured to receive the processed gas from the reaction chamber,
• wherein the cooling unit is located such that processed gas would pass through the cooling unit of the nitrogen oxide reduction apparatus,
• wherein the cooling unit includes a plurality of gas injection nozzles configured to inject a low-temperature gas, wherein the plurality of gas injection nozzles are separate from the at least one water injection nozzle,
• wherein gas injection nozzles of the plurality of gas injection nozzles are formed at multiple locations of the nitrogen oxide reduction apparatus with multiple and different axial heights of the cooling unit,
• wherein the processed gas from the reaction chamber reaches the gas injection nozzles of the cooling unit, and the low-temperature gas is configured to cool the processed gas within the cooling unit to a temperature lower than a nitrogen oxide generation temperature vet maintain the processed gas above a harmful-gas processing temperature, and
• wherein the misting pipe is configured to further cool the processed gas.