| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate clogging of a nozzle automatically when a urea water injection nozzle is clogged and recover denitration operation of a denitration device for reducing and removing nitrogen oxides in combustion exhaust gas by injecting urea water from a urea water injection nozzle. Ž<P>SOLUTION: The denitration device is provided with a pressure measuring device 6 for measuring a pressure in the urea water injection nozzle 4 or a urea water supply path, and a pressurized air supply means 7 for supplying pressurized air in the urea water injection nozzle 4. The denitration device is provided with a control device 8 for controlling to stop urea water supply to the urea water injection nozzle 4 and supply pressurized air to the urea water injection nozzle 4 when a pressure value measured by the pressure measuring device 6 exceeds a pressure high abnormality determination value, and controlling to stop supply of the pressurized air to the urea water injection nozzle 4 and restart the urea water supply to the urea water injection nozzle 4 when the pressure value by the pressure measuring device is less than the pressure high abnormality determination value. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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