| 摘要 |
PURPOSE: To provide the high denitration performance by injecting ammonia of required amount based on the constitution of NO2 and NO and exhaust gas amount after feeding NO2 of required amount into an exhaust pipe in a process for reduction removing a nitrogen oxide in exhaust gas by injecting ammonia into the exhaust gas pipe. CONSTITUTION: When exhaust gas exhausted from a combustion furnace 1 through an exhaust pipe 2 is fed into a denitration device 3, ammonia 9 is injected into the exhaust pipe 2 to reduction remove a nitrogen oxide in the exhaust gas. At that time, the NO and NO2 concentration in the exhaust gas is sensed by a concentration measuring meter 8 and the exhaust gas amount is sensed by a flowmeter 7 and based on the sensed values fuel an NO2 generation accelerating material and combustion air of the amounts computed by a control device 20 are fed to an NO2 generation combustion burner 6 to generate the NO2 gas of required amount. The NO/NO2 ratio in the exhaust gas is almost close to 1 (one) in the exhaust pipe 2, and ammonia 9 of required amount based on the NO2 and NO concentration in the exhaust gas and the exhaust gas amount is injected into the exhaust pipe 2. |
