Monitoring Characteristic of NOx Sensor Based on CFD

BIAN Zengtao; WANG Fengshuang; LIU Xinglong; LI Junpu; GENG Lei; LI Zhaoyang

doi:10.3969/j.issn.1001-2222.2021.04.013

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (4) : 86. DOI: 10.3969/j.issn.1001-2222.2021.04.013

Monitoring Characteristic of NO^_xSensor Based on CFD

BIAN Zengtao^1,2，WANG Fengshuang^1,2，LIU Xinglong^1,2，LI Junpu^1,2，GENG Lei^1,2，LI Zhaoyang^1,2

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Abstract

According to the bench test experience of China Ⅵ diesel engine, a large difference of NO_xcontent occurred between NO_x sensor of downstream of some SCR system and bench gas analyzer. Two SCR schemes were calculated by using computational fluid dynamics (CFD) technology, and the shape of urea spray and the evaporation and decomposition were analyzed. Then the uniformity of ammonia distribution on the front face of SCR carrier and the installation position of NO_x sensor was evaluated. The proportion of ammonia distribution deviation at NO_x probe was further analyzed. The simulation results show that the ammonia unevenness before SCR is the reason of NO_x deviation. The deviation reduces from 15% to 0.5% after introducing the mixing device at downstream of SCR substrate, which solves the problem of large deviation. The bench test shows that the simulation and test results are in good agreement, which proves the credibility of CFD analysis.

Key words

NO_xsensor / ammonia / uniformity / SCR

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BIAN Zengtao，WANG Fengshuang，LIU Xinglong，LI Junpu，GENG Lei，LI Zhaoyang. Monitoring Characteristic of NO^_xSensor Based on CFD[J]. Vehicle Engine. 2021, 0(4): 86 https://doi.org/10.3969/j.issn.1001-2222.2021.04.013