| 摘要 |
<p>PURPOSE:To smooth adsorption and desorption cycles and to simplify control by dividing the waste gas flow as rising flow at the time of ammonia adsorption and the high-temp. gas flow as descending flow at the time of ammonia desorption to two systems and introducing the ammonia-contg. gas at the time of desorption to the upstream side of denitrification equipment. CONSTITUTION:The waste gases contg. the ammonia excessively injected by an ammonia injector 3 are forced as rising flow into an ammonia adsorption column A5 on the downstream side of the denitrification equipment 4 by holding dampers 11, 12 open. The adsorption operation is changed over to an absorption column B5 by closing the dampers 11, 12 and opening dampers 13, 14 after the adsorption column A5 sufficiently adsorbs the ammonia. The adsorption column A5 where the ammonia is sufficiently adsorbed is heated a damper 18 as descending flow from above. The desorbed ammonia is returned to the upstream side of the denitrification equipment 4 by opening a damper 16.</p> |
