基于不同测量原理的柴油机氮氧化物排放测量结果对比研究

Comparative Research on Nitrogen Oxides Emission Measurement Results of Diesel Engine Based on Different Measurement principle

采用三种不同测量原理的氮氧化物(NO_(x))测量设备对某柴油机进行了10个稳态点和全球统一的瞬态循环(WHTC)排放试验,以化学发光法(CLD)测量原理的HORIBA MEXA-1600DSEGR设备测量NO_(x)体积浓度结果为基准,分析对比了以电化学法测量原理的NO_(x)传感器和非分散紫外吸收法(NDUV)原理的AVL 493D GAS PEMS IX设备的稳定性和响应性。试验结果表明,三种设备稳态工况时测量结果一致性较好;WHTC循环测量低浓度NO_(x)时,电化学法与CLD法测量值偏差较大;在进行瞬态试验时,电化学法测量NO_(x)的响应较慢,NDUV法响应基本上与CLD法一致。

The nitrogen oxide(NO_(x))measurement equipment with three different measurement principles was used to carry out 10 steady-state points and world harmonized transient cycle(WHTC)emission test on a diesel engine and the HORIBA MEXA-1600DSEGR based on the Chemiluminescent Detector(CLD)measurement principle equipment measured bulk concentration of NO_(x)results as a benchmark,analysis and comparison of the NO_(x)sensor based on the electrochemical measurement principle and the Non-Dispersive Ultra-Violet(NDUV)method principle of AVL 493D GAS PEMS IX equipment stability and responsiveness.The three different instrument showed good consistency on the steady state test condition.The WHTC test results show that when measuring low concentrations of NO_(x),the electrochemical method and the CLD method have large deviations;when the transient test is performed,the electrochemical method has a slower response to NO_(x)measurement,and the response of the NDUV method is basically the same as that of the CLD method.