SCR反应中NH3的存储释放特性及影响因素的数值研究

建立了SCR催化反应的动态反应模型,研究了反应温度和空速对NH3存储与释放特性的影响.结果表明:随着反应温度的升高,NH3的存储量逐渐减小;处于不同温度区间时,空速对于NH3的存储量的影响表现出了不同的特征,在200～300℃区间,随着空速的增大,NH3存储量的减少幅度大;而在300℃以上时,空速增大,NH3存储量的减少幅度小.温度越高,NH3的存储与释放速度越快;相同温度下,空速越高,NH3的存储与释放越快.研究结果对于柴油机SCR系统还原剂喷射控制策略的制定具有参考价值.

Numerical Study of the Storage-release Characteristics and the Influencing Factors of NH3 in Selective Catalytic Reduction Reaction

The effect of reactive temperature and space velocity on the storage-release characteristics of NH3 was investigated on the dynamic reaction model of SCR catalytic reaction.The result has shown that the storage amount of NH3 increases with the increase of reactive temperature,the impact of reactive space velocity on NH3 storage amount shows different characteristics in different temperature ranges,the decreasing trend of NH3 storage amount increases with the increase of reactive space velocity when the temperature is between 200 ℃ and 300 ℃,and the decreasing trend of NH3 storage amount decreases with the increase of reactive space velocity when the temperature is over 300 ℃.Reactive temperature and space velocity also have effect on the storage and release velocity of NH3.