| 摘要 |
PURPOSE:To obtain a method of recycling an exhaust gas treatment catalyst by which to make it possible to recycle a catalyst with excellent desulfurization/ denitration activities by water-washing a carbonaceous catalyst used for exhaust gas desulfurization and denitration after thermal treatment. CONSTITUTION:In an exhaust gas treatment device, an exhaust gas is guided to a moving bed reactor 3 filled with a carbonaceous catalyst 4 with ammonia injected from a line 2, through a line 1. Further, the exhaust gas comes in contact with the descending carbonaceous catalyst 4 to be desulfurized/ denitrated. A clean gas after treatment is released into an atmosphere from a line 5. The carbonaceous catalyst 4 in the reactor 3 is extracted from below after exhaust gas treatment, then is heated to 300 to 600 deg.C by a heater 6 in an inert gas atmosphere, and sulfuric acid and its ammonium salt are desorbed as SO2, NH3 and N2. This catalyst 4 after heating is loaded in a separator 7 and the pulverized catalyst and dust are removed. After that, the catalyst 4 is sent to a waver washer 8 to have an alkali metal salt removed by water wash, and is returned to the top of the reactor 3 after drying. |
