| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas denitrification system allowing stable measurement of a concentration of nitrogen oxides in exhaust gas in the flue.SOLUTION: An exhaust gas denitrification system comprises: an ammonia injection unit 104 serving as a reductant supply means of supplying a reductant into combustion exhaust gas 102 from a boiler 101; a denitrification unit 105 provided with a denitrification catalyst 106 denitrifying NOx in the exhaust gas 102 containing the reductant; an NOx concentration distribution measurement unit 110 having a plurality of probe means each arranged on the inlet side and the outlet sides of the denitrification unit 105 and measuring an NOx concentration distribution in the exhaust gas in a divided surface region perpendicular to the gas flow of the denitrification unit 105, and measuring by laser measurement means; and a divergence setting portion 109 serving as control means of determining a NOx concentration distribution from the measurement results of the NOx concentration distribution measurement unit 110, determining any divisions of insufficient denitrification with a NOx concentration equal to or higher than a specified value on the basis of the determined NOx concentration distribution, and adjusting the supply amounts of the reductant from the reductant supply means corresponding to the divisions of insufficient denitrification. |
