放电能量密度对NTP-SCR系统降低柴油机NOX排放的影响

Effect of discharge energy density on reduction of NOX emissions from diesel engine by NTP-SCR system

放电能量密度对NOX转换效率具有直接影响,传统方法选取的放电能量密度在NOX转换上,转换效率较低,严重影响柴油机NOX的排放。因此,以试验的方式研究了放电能量密度对NTP-SCR系统降低柴油机NOX排放的影响。制备催化剂,以常柴4FCTCI柴油机、测功机、内燃机测控系统、NTP-SCR系统、流量计、气体采样管和柴油机排气分析测试设备构成实验平台,在该实验平台上,研究不同放电能量密度下,NOX的转换效率。试验结果表明,在放电能量密度过低或过高时,NOX的转换效率都较低,而在放电能量密度为60J/L时,NOX转换效率最高。并通过仿真实验的方式,证明应用此次研究的放电能量密度后NOX的转换效率比应用传统方法的NOX的转换效率高,说明此次试验得到的放电能量密度值是有效的,可提高NOX转换效率,以降低柴油机NOX排放,在柴油机排气后处理领域有着广泛的应用前景。

The discharge energy density has a direct impact on the NOX conversion efficiency.The discharge energy density selected by the traditional method is on the NOX conversion,and the conversion efficiency is low,which seriously affects the NOX emissions of the diesel engine.Therefore,the effect of discharge energy density on the reduction of NOX emissions from diesel engines by NTP-SCR system was studied experimentally.The catalyst is prepared,and an experimental platform is constructed with Changchai 4FCTCI diesel engine,dynamometer,internal combustion engine measurement and control system,NTP-SCR system,flow meter,gas sampling tube,and diesel exhaust analysis test equipment.On this experimental platform,different discharge energy densities are studied Under the NOX conversion efficiency.The test results show that when the discharge energy density is too low or too high,the NOX conversion efficiency is low,and when the discharge energy density is 60J/L,the NOX conversion efficiency is the highest.And through simulation experiments,it is proved that the conversion efficiency of NOX after applying the discharge energy density of this study is higher than the conversion efficiency of NOX using the traditional method,indicating that the discharge energy density value obtained in this experiment is effective and can improve NOX conversion.Efficiency in order to reduce the NOX emissions of diesel engines has a broad application prospect in the field of diesel exhaust aftertreatment.