Solid SCR System Operation and NOx Emission Characteristics of Diesel Vehicle

LIU Ming; HE Chao; LI Jiaqiang; LIU Xueyuan; PENG Qikai; ZOU Lang

doi:10.3969/j.issn.1001-2222.2019.01.009

Vehicle Engine ›› 2019, Vol. 0 ›› Issue (1) : 53-57. DOI: 10.3969/j.issn.1001-2222.2019.01.009

Solid SCR System Operation and NOx Emission Characteristics of Diesel Vehicle

LIU Ming，HE Chao，LI Jiaqiang，LIU Xueyuan，PENG Qikai，ZOU Lang

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Abstract

A total of 1.35 million effective realtime working and emission data within 38 days for diesel sanitation vehicle with solid SCR system were acquired by using the realtime monitoring platform of automobile exhaust gas. The results show that diesel vehicle runs at an average speed of 13.45 km/h and 90% of acceleration points fluctuates within ±1.5 m/s².The average mass concentration of NO_x is 0.023 g/s and its average emission factor is 4.17 g/km. The NO_xconversion rate increases with the increase of vehicle velocity and increases and then becomes stable with the increase of exhaust temperature. When the average exhaust temperature is lower than 150 ℃，the average conversion rate of NO_x is 61%. Accordingly, the solid SCR system can greatly reduce NO_x emissions of diesel vehicles at low exhaust temperature.

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diesel vehicle / solid SCR / exhaust measurement / nitrogen oxides

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LIU Ming，HE Chao，LI Jiaqiang，LIU Xueyuan，PENG Qikai，ZOU Lang. Solid SCR System Operation and NOx Emission Characteristics of Diesel Vehicle[J]. Vehicle Engine. 2019, 0(1): 53-57 https://doi.org/10.3969/j.issn.1001-2222.2019.01.009