炉内脱硝における酸化プロセスのシミュレーション

抄録

The second oxidation process of the tw-ostage reaction between hydrocarbons and nitrogen oxides was simulated by use of 112 reactions containing N₂, O₂, H₂, H₂O, H₂O₂, H, O, OH, HO₂, NH3, NH₂, NH, N, HNO, NO, NO₂, N₂O, HCN, CN, NCN, C₂N₂, NCO, CHO, CO, CO₂.
Though Calculated concentrations of NO_x at the outlet of the reactor did not agree precisely with the experimental results, the calculations followed the experiment at various conditions. The results of the calculations revealed the following features of the oxidation of nitrogen compounds. Most of the HCN changed to CN, NCO, NH. Nitic oxide and nitrogen were formed mainly through NCO+O →CO +NO, NH+OH→NO+H₂, and through NO+N→N₂+O, respectively. The decrease of oxygen at the inlet of the reactor decreased NCO and increased N, NH in the reactor and caused the reduction of NCO+O→CO+NO and acceleration of NO+N→N₂+O, NH+NO→N₂+OH. The concentrations of NO, NCO, N, NH in the reactor were lowered and the formation rate of NO and N₂ were decreased with decrease of nitrogen compounds at the inlet. The decrease of the latter was larger than the former. The high concentration of NO at the inlet of the reactor reduced the formation of NO and accelerated the formation of N₂.