| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent choke of a urea water injection nozzle 4 due to deposition of urea inside the urea water injection nozzle 4, in denitration equipment reducing and removing nitrogen oxides in combustion exhaust gas by injecting urea water from the urea water injection nozzle 4. <P>SOLUTION: In the denitration equipment, the urea water injection nozzle 4 is installed on an exhaust gas passage 3 through which combustion exhaust gas generated in a combustion device such as a prime mover passes, and urea water is injected from the urea water injection nozzle 4 toward the combustion exhaust gas to reduce and remove nitrogen oxides in the combustion exhaust gas. In the denitration equipment capable of supplying air and water to the urea water injection nozzle 4 in addition to urea water, when denitration operation is started, control is performed such that air is supplied to the urea water injection nozzle 4 first, water is supplied to the urea water injection nozzle 4 next, and then, urea water supply to the urea water injection nozzle 4 is started. <P>COPYRIGHT: (C)2007,JPO&INPIT |
