Abstract
Improving the flow field uniformity of catalytic converter can promote the catalytic conversion of NO to NO2. Firstly, the physical and mathematical models of improved catalytic converter are established, and its accuracy is verified by experiments. Then, the NO catalytic performances of standard and improved catalytic converters are compared, and the influences of structural parameters on its performance are investigated. The results showed that: (1) The gas uniformity, pressure, drop and NO conversion rate of the improved catalytic converter are increased by 0.0643, 6.78%, and 7.0% respectively. (2) As the cell density combination is 700 cpsi/600 cpsi, NO conversion rate reaches the highest, 73.7%, and the gas uniformity is 0.9821. (3) When the tapered height is 20 mm, NO conversion rate reaches the highest, 72.4%, and the gas uniformity is 0.9744. (4) When the high cell density radius is 20 mm, NO conversion rate reaches the highest, 72.1%, and the gas uniformity is 0.9783. (5) When the tapered end face radius is 20 mm, NO conversion rate reaches the highest, 72.0%, and the gas uniformity is 0.9784. The results will provide a very important reference value for improving NO catalytic and reducing vehicle emission.
Highlights
Environmental pollution brings serious ecological problems (Matsuzawa et al 2001; Baumard et al.1998), and automobile exhaust pollution is one of the sources of serious environmental pollution, so it is urgent to reduce automobile emissions (Zhang et al 2021; Sun et al 2021; Lichtfouse et al 1997)
The results revealed that the pressure drop was reduced by 12%, and the gas uniformity was better
The results showed that after the exhaust gas passed through the catalytic converter, the particles of 4-8 nm were reduced by 96%, while the purification effect of particles larger than 50 nm was not obvious
Summary
Environmental pollution brings serious ecological problems (Matsuzawa et al 2001; Baumard et al.1998), and automobile exhaust pollution is one of the sources of serious environmental pollution, so it is urgent to reduce automobile emissions (Zhang et al 2021; Sun et al 2021; Lichtfouse et al 1997). For catalytic converters, Hesham et al (2018) proposed that insulating material was placed in the carrier channel to investigated the distribution of the internal flow field They found that the gas uniformity was improved by 5%. The results showed that after the exhaust gas passed through the catalytic converter, the particles of 4-8 nm were reduced by 96%, while the purification effect of particles larger than 50 nm was not obvious. Takeru et al (2017) found, compared with the standard carrier structure, the catalyst durability of the radial variable cell density carrier was better, and the NOx reaction temperature was reduced by 10°C. The purification performance and flow characteristic of standard and improved catalytic converters are compared, and the effects of different structural parameters on the improved catalytic converter are analyzed. The research results will provide a very important reference value for improving the purification performance and service life of catalytic converters
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