| abstract |
(57) [Problem] To provide a method for denitration of high-temperature exhaust gas which does not require excess ammonia as in the conventional method, in a flue gas denitration method in which the exhaust gas temperature becomes 500 ° C. or higher. SOLUTION: This is a method for denitrifying exhaust gas containing nitrogen oxides of 500 ° C. or more using a selective catalytic reduction denitration apparatus using ammonia as a reducing agent, wherein the denitration apparatus is provided with a catalyst layer in multiple stages, A high-temperature denitration method, wherein an ammonia injection point is disposed between an upstream of a catalyst layer and a multi-stage catalyst layer, and the ammonia is divided and injected while being treated. |