| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas denitration method for satisfactorily continuing denitration of nitrogen oxides in exhaust gas. <P>SOLUTION: An exhaust pipe 13 for exhausting exhaust gas 12 emitted from an internal combustion engine 11 is provided with a reducing agent feeding means 15 for feeding ammonia water or ammonia reducing agent 14 such as a urea, and a vanadium denitration catalyst 16. The ammonia reducing agent 14 is sprayed into the exhaust gas 12 to be reacted with NOx and NH<SB>3</SB>in the exhaust gas and reduced to N<SB>2</SB>. When a predetermined temperature in the exhaust gas is detected with a thermometer 20, the ammonia reducing agent feeding is stopped by closing a valve 21. <P>COPYRIGHT: (C)2004,JPO |
