Optimization of the Urea Injection Angle and Direction: Maximizing the Uniformity Index of a Selective Catalytic Reduction System

Seokhoon Jeong, Hoonmyung Kim, Hyunjun Kim, Ohyun Kwon, Eunyong Park and Jeongho Kang
Additional contact information
Seokhoon Jeong: Powertrain Efficiency R&D Center, Korea Automotive Technology Institute, 303, Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si 31214, Korea
Hoonmyung Kim: Powertrain Efficiency R&D Center, Korea Automotive Technology Institute, 303, Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si 31214, Korea
Hyunjun Kim: Powertrain Efficiency R&D Center, Korea Automotive Technology Institute, 303, Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si 31214, Korea
Ohyun Kwon: Engin Development Team, Daedong Industrial Co., Ltd., 602, Nongong-ro, Nongong-eub, Dalseong-gun 42981, Korea
Eunyong Park: TESK R&D Center, 20, Saneopdanji-ro, Eomo-myeon, Gimcheon-si 39536, Korea
Jeongho Kang: Powertrain Efficiency R&D Center, Korea Automotive Technology Institute, 303, Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si 31214, Korea

Energies, 2020, vol. 14, issue 1, 1-13

Abstract: The uniformity of ammonia is very crucial for reducing the NO X emissions in a selective catalytic reduction system since the uniformity highly affects the chemical reaction between the ammonia and NO X emission. However, increasing ammonia uniformity in a short time period while injecting a urea solution is not a trivial task. Therefore, in this study, the uniformity of various urea injector designs is compared and an optimal design for the urea injector angle and direction is selected. The uniformity index (UI) was calculated using numerical analysis and compared with experimental result to achieve high reliability. The boundary condition of the analysis is extracted from the dominant operating region of the non-road transient cycle (NRTC) to guarantee a realistic analysis result. The design candidates were generated from the combination of three urea injection angles and eight urea injection directions and thoroughly compared to provide an insightful analysis. The conclusion is that injecting urea in the opposite direction to the main stream of exhaust gas increases the kinetic energy and thus the uniformity is highly increased. For example, urea injection in the opposite direction and angle to the mainstream flow could increase the UI to 0.966, which is a 16.7% improvement compared to the same direction and angle injection.

Keywords: design optimization; numerical analysis; selective catalytic reduction; uniformity index; urea injector design (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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