| 摘要 |
PURPOSE:To obtain a waste gas denitration apparatus capable of performing stable operation continuously for a long period by constructing the apparatus to have a duct structure capable of separating and removing large sized dust grains contained in waste combustion gas continuously and efficiently and preventing clogging of a denitration catalyst bed and deterioration of the performance of the apparatus. CONSTITUTION:A flue for waste gas at the upstream side of a denitration reactor 3 housing the catalyst bed 8 is constructed to have a duct structure having a rising part which changes the direction of the stream of the waste gas from almost horizontal direction to vertical direction. A sectional area of the horizontal duct 1 is designed to be smaller than a sectional area of the vertical duct 2, thus the flow rate of the waste gas in the vertical duct 2 is lessened so as to facilitate falling of the large sized dust grains contained in the waste gas. Further, a hopper 6 for collecting the large sized dust and a means 7 for discharging the large sized dust collected in the hopper 6 out of the duct system are provided to below the vertical duct 2. Or, a withdrawing duct having a flow rate controlling means for withdrawing the large sized dust is provided to a dust discharging line provided to the down stream side of the denitration reactor 3. |
