Method for removing nitrogen oxides from exhaust gas

摘要: In an apparatus for selectively reduction-removing nitrogen oxides in exhaust gas presence of catalyst by spraying aqueous solid reducing agent solution into flowing through a duct to mix the gas, present invention prevents nozzle-clogging caused or its reaction product, permits stable and continuous uniform mixing thus removes at high efficiency. The nozzle is cooled supplying least one water before nozzle. Upon discontinuing supply nozzle, supplied remove remaining stored concentration sprayed after diluting it with course transfer spraying. A line added solution. On side peripheral surface duct, having double-tube structure comprising inner outer tube which tip projects 1 5 mm from installed, spray between tubes gas.