| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase the gas flow velocity by reducing the sectional area in a low load condition to prevent any catalyst clogging by varying the exhaust gas passing sectional area of a denitration catalyst layer, and make the dust wear resistance retainment compatible with the dust clogging resistance with respect to a catalyst by changing the gas passing sectional area of the denitration reactor according to the boiler load factor. <P>SOLUTION: In this flow velocity control device, the exhaust gas passing sectional area of a denitration catalyst layer is varied by providing a damper 4 for blocking the exhaust gas directly on the upstream side of the denitration layer 2 in an exhaust gas flue, and controlling the blocking of the exhaust gas flow by the damper. <P>COPYRIGHT: (C)2007,JPO&INPIT |
