| 摘要 |
PURPOSE:To simultaneously attain both the denitrification and desulfurization with economicity and high efficiency by reacting NOx and NH3 in waste gas in a reduction denitrification reactor before introducing the waste gas contg. residual NH3 into a wet type denitrification device to remove SO2 in the waste gas. CONSTITUTION:In a passage from a boiler 1 for combustion waste gas, an NH3 injection part 3 for injecting NH3 fed from an ammonia tank 2 is installed. The waste gas into which NH3 has been injected is introduced into a reduction denitrification reactor 4 packed with a reducing catalyst to denitrify it. On the downstream side of the reduction denitrification reactor 4, an air heater 5 and an electrostatic precipitator 6 are arranged. On the downstream side of the electrostatic precipitator 6, a wet type denitrification device 7 is arranged. In the wet type denitrification device 7, a suspension (slurry) including CaCO3 that is an adsorbent for SO2 is circulated to absorb and remove SO2 from the waste gas by gas-liquid contact with the waste gas. On the other hand, NH3 which has become excessive in the reducing catalytic reactor 4 is fed into the wet type denitrification device 7 together with the waste gas to absorb it into the slurry. |
