DEVICE FOR ELIMINATING N2O WITHIN EXHAUST GAS AND METHOD FOR ELIMINATING N2O

摘要

By use of an N2O removing system comprising a plurality of gas flow passages 1 and catalyst packed layers 2 packed with N2O decomposition catalysts, which are alternately arranged, wherein the gas flow passages 1 next to each other via the catalyst packed layers 2 comprise a gas introduction passage 11 and a gas discharge passage 12, and wherein the respective gas flow passages are provided with valves 3 sequentially opened along with the deterioration of N2O catalysts due to their time-dependent changes to cumulatively increase the number of the catalyst packed layers used, the valves 31 and 32 are opened along with time-dependent changes after the beginning of N2O removal treatment, thereby cumulatively increasing the number of the catalyst packed layers 2 used.