烟气中N_2O生成反应的动力学研究

STUDY ON THE KINETICS OF N_2O FORMATION REACTIONS IN FLUE GASES

采用静态法,模拟烟道气中对N_2O生成有影响的组分NO,SO_2和H_2O,以及温度进行了动力学研究。结果表明,随着NO,SO_2和H_2O浓度的增加和反应时间的加长,N_2O的生成量增加,反应温度升高,N_2O的生成速率下降,将实验数据用尝试法和微分法进行处理,得到如下结果:在N_2O的生成反应中对NO,SO_2和H_2O均为一级反应,反应速率常数分别为:2.0×10^(-5),8.9×10^(-6),8.8×10^(-8)m^3·mol^(-1)·s^(-1),而反应活化能分别为43.6,42.7和73.7kJ·mol^(-1)

The kinetics of N2O formation reactions from NO, SO2, O2 and H2O in simulated flue gas was studied by static method. The influences of NO, SO2 and H2O contents and temperature to N2O formation have been investigated. The results showed that the con-centration of formed N2O increased with increase of NO,SO2,O2and H2O contents in the system, and it increased also with time. The formation rate of N2O decreased when the reaction temperature increased. Treated with the experimental data by attempting and differential methods,the following results were obtained. In the N2O formation reactions there were first-degree reactions for all NO,SO2 and H2O. The constants of reaction rate for NO,SO2and H2O were 2.0×10-5,8.9 #10-5 and 8.8×10-8m3 ° mol-1 ° s-1.The ac-tivation energy were 43. 6, 42. 7 and 73. 7kJ ° mol-1 for NO, SO2 and H2O.