| 摘要 |
PURPOSE:To provide a method for efficiently adsorption removing nitrogen oxide relatively low in concentration in a ventilating gas of roads or tunnels or the like by rotary adsorption type denitrating device to purify a ventilation gas even in the case of using an adsorbent having no or insufficient denitration catalytic ability. CONSTITUTION:In the rotary adsorption device 2, a non-denitrating material is used as the adsorbent, a recirculating gas for reproduction is passed through a denitration reactor 5 in a gas recirculating passage after NH3 is infected, or the recirculating gas for reproduction is passed through a NOx decomposition reactor and the adsorbent is reproduced by the denitration treated or decomposition treated gas. |
