| abstract |
The present invention relates to a technology for decreasing nitrogen oxide (NOx), which is a hazardous exhaust gas discharged from an internal combustion engine or a combustor, and, more particularly, to a reactor for a nitrogen oxide purification system using a solid ammonium salt and a selective reduction catalyst, wherein a solid ammonium salt is put into the reactor and is changed into ammonia through pyrolysis using engine cooling water, exhaust gas, or an electric heater installed inside the reactor, the ammonia is ejected using a pressure valve and a dosing valve, thereby to reducinge nitrogen oxide, which exists in an exhaust pipe, into nitrogen on a selective reduction catalyst., and Tthe reactor has first and second chambers formed separately such that the temperature of the first chamber can be raised quickly to a temperature at which pyrolysis of the solid ammonium salt is possible, thereby decreasing nitrogen oxide within a short period of time during initial startup and reducing energy consumption needed to heat the reactor. |