NOX EMISSION PURIFICATION SYSTEM USING MULTI NOZZLE INJECTION OF UREA POWDER

摘要

The present invention relates to a technique for reducing nitrogen oxide (NO_x) that is harmful exhaust gas exhausted from an internal combustion engine or a combustor and, more particularly, to a nitrogen oxide purifying system based on urea powder injection using porous nozzle, in which urea powder is injected into an exhaust pipe to be converted into ammonia gas and is allowed to react to nitrogen oxide on selective reduction catalysts to purify the gas to nitrogen harmless to the human body, and efficiency of converting the urea powder into the ammonia gas is improved using porous injection nozzle, thereby improving efficiency of purifying the nitrogen oxide. The nitrogen oxide purifying system based on urea powder injection using porous nozzle comprises: an injection nozzle that is installed in an exhaust pipe of a selective reduction catalyst front end; an air supply unit that supplies compressed air to the injection nozzle; an urea powder supply unit that supplies urea powder to the injection nozzle; and a control unit that is connected to the air supply unit and the urea powder supply unit and controls the air and the urea powder to be supplied.