Method and device for removing nitrogen oxide

PURPOSE: To remove nitrogen oxide in exhaust gas with high efficiency by preventing a nozzle and its tip part from being clogged by a solid reducing agent and its reaction product to stably and continuously spray water solution of the solid reducing agent into the exhaust gas and simultaneously uniformly mixing the water solution of the solid reducing agent in the exhaust gas. CONSTITUTION: A nozzle 11 which has double-pipe construction consisting of an inner pipe and an outer pipe and where the tip part of the inner pipe projects 1-5mm from the tip part of the outer pipe is provided on the side circumferential surface of a duct 2. Water solution of a solid reducing agent is fed into the inner pipe 13 of the nozzle 11 and simultaneously spraying gas is fed into between the inner pipe and the outer pipe, causing the water solution of the solid reducing agent to be sprayed into the exhaust gas. COPYRIGHT: (C)1993,JPO&Japio