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Study of the Optimization of the SCR Catalyst Position in by Exhaust System of using Mixer


  • Department of Mechanical Engineering, Graduate School, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, 31080, Korea, Republic of
  • Division of Mechanical and Automotive Engineering, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, 31080, Korea, Republic of


Background/Objectives: This research analyzes the influence of Urea SCR System's mixer and optimization of the Catalyst's position through post technologies in order to satisfy the Euro 6 regulations. Methods/Statistical Analysis: The simplified modeling was facilitated to interpret the current exhaust system. Considering the latter as the background, ANSYS was used for the Analysis. As for the method of Analysis, 5 flux variables were considered from exhaust flux of 1,000rpm~3,000 rpm in increments of 500 rpm. Findings: When the flux passes through the mixer, the speed dispersion increased and as the rpm increased, the results showed that 1,000 rpm compared to 3,000 rpm, the back pressure elevated over 500 Pa. By assessing the degree of uniformity, the uniformity expanded faster at high rpm and in low rpm, the flux itself is low so the uniformity gradually increased as it reached the latter part. Overall efficiency of over 95% was achieved at approximately 15~20 cm and in the points after that, the degree of uniformity gradually decreased in the graph. Therefore, it was determined that optimal position for the SCR catalyst should be 20~50 cm from the posterior of the mixer. Application/Improvements: This research was analyzed of the distribution uniformity effect in the exhaust system, the analysis result could be optimized of catalyst-position and improved uniformity index.


Back Pressure, Exhaust System, Mixer, SCR Catalyst, Uniformity Index.

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