| 摘要 |
PROBLEM TO BE SOLVED: To reduce the SOx concn. together with the amt. of NH3 injected in a method for reducing SOx and NOx concns. in an exhaust gas produced by burning a fuel having high S and V contents in a boiler by injecting a gas for an ignition burner into the vicinity of an exhaust gas introduction port of a denitration apparatus at the downstream side of the boiler. SOLUTION: A fuel having high S and V contents, such as an olimulsion, is fed from burners 5 installed in a boiler 1 and is burned. Then, enough air is supplied from an over air port 6 installed at the downstream side of the burners 5 to conduct two-step burning to completely burn CO. An exhaust boiler gas is discharged through the top of the boiler 1, is caused to pass through a gas mixer to make the concn. distribution of each gas in the exhaust gas uniform, and is introduced into a denitration apparatus 2. An LPG gas, as a reducing component for the exhaust gas, is injected into the vicinity of the exhaust gas introduction port of the denitration apparatus 2 through an LPG gas supply device 8 and an LPG gas injection line 9. Thus, the amt. of NH3 injected into the exhaust gas is decreased. |
