Application Study on a New Hybrid Canning Structure of After-Treatment System for Diesel Engine

Zhao, Chuang; Lou, Diming; Zhang, Yunhua; Lü, Kai; Liu, Shusen

doi:10.3390/en13030734

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…The temperature at the center of the nozzle holder is lower than other positions, but the temperature of the nozzle holder wall is higher than the center, the wall film thickness on the wall is minimal, which can also be seen from the Figure 13. According to the crystallization evaluation criteria [26] and the calculated wall film thickness and temperature, the wall film thickness at the connection between the nozzle holder and the pipeline is large, but the temperature is high, so the crystallization risk is judged to be medium. The wall film thickness on the pipeline is small, so the crystallization risk is relatively low, and the crystallization risk at the mixer is medium.…”

Section: Temperature Distribution At the Wall Filmmentioning

confidence: 99%

A study on the high-efficiency mixer of the SCR system

Lü¹,

Liu²,

Wu³

et al. 2021

Mechanics & Industry

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A new mixer for a diesel engine after-treatment system is developed to meet the requirements of China VI emission regulation. As for the structure of the mixer, it is surrounded by spiral blades, and the center is staggered with small blades, which is conducive to the crushing of urea droplets and can make the droplets fully mixed with air, improve the conversion efficiency of nitrogen oxides (NOx) and reduce ammonia leakage. The numerical analysis, engine bench test, and vehicle road test were carried out on the after-treatment system equipped with the new mixer. The numerical calculation results show that the velocity uniformity index of the selective catalytic reduction (SCR) carrier can reach 0.98, as well as the ammonia uniformity can reach 0.95, meanwhile, the low wall film height shows excellent anti-crystallization properties. engine bench test results are consistent with numerical results. The crystallization status of the mixer after the vehicle durability test is acceptable and well performed.

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Section: Temperature Distribution At the Wall Filmmentioning

confidence: 99%

A study on the high-efficiency mixer of the SCR system

Lü¹,

Liu²,

Wu³

et al. 2021

Mechanics & Industry

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“…Shape (b) was a bent pipe, and it was modeled to analyze the characteristics of the gas flow passing through the wall. Shape (c) was a pipe composed of tapered pipes and was the shape of the expansion duct of SCR [20]. Shape (d) was a model of an orifice installed in the center of the pipe.…”

Section: Modelingmentioning

confidence: 99%

A 1D–3D Approach for Fast Numerical Analysis of the Flow Characteristics of a Diesel Engine Exhaust Gas

Kong

2021

Machines

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It is necessary to analyze the intake/exhaust gas flow of a diesel engine when turbocharger matching and when installing emission control devices such as exhaust gas recirculation (EGR), selective catalytic reduction (SCR), and scrubbers. Analyzing the intake/exhaust gas flow using a 3D approach can use various analytical models, but it requires a significant amount of time to perform the computation. An approach that combines 1D and 3D is a fast numerical analysis method that can utilize the analysis models of the 3D approach and obtain accurate calculation results. In this study, the flow characteristics of the exhaust gas were analyzed using a 1D–3D coupling algorithm to analyze the unsteady gas flow of a diesel engine, and whether the 1D–3D approach was suitable for analyzing exhaust systems was evaluated. The accuracy of the numerical analysis results was verified by comparison with the experimental results, and the flow characteristics of various shapes of the exhaust system of a diesel engine could be analyzed. Numerical analysis using the 1D–3D approach was able to be computed about 300 times faster than the 3D approach, and it was a method that could be used for research focused on the exhaust system. In addition, since it could quickly and accurately calculate intake/exhaust gas flow, it was expected to be used as a numerical analysis method suitable for analyzing the interaction of diesel engines with emission control devices and turbochargers.

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“…Zhao et al studied the possibility to decrease the emissions from diesel engines by designing a new packaging structure based on the airflow rotation concept, and composed of a hybrid structure of spiral space with small blades and conical plates [89]. In particular, the authors used both the CFD simulation and experimental tests to analyze the velocity uniformity inside the structure and to assess this new design.…”

Section: Other Simulation Approachesmentioning

confidence: 99%

Most Recent Advances in Diesel Engine Catalytic Soot Abatement: Structured Catalysts and Alternative Approaches

Meloni

Palma

2020

Catalysts

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Diesel engine emissions are typically composed of several hundred chemical compounds, partly present in the gas phase and partly in solid phase as particles, the so-called particulate matter or soot. The morphology of the catalyst is an important characteristic of soot particles’ abatement, since a good contact between catalyst and soot is mandatory. For practical purposes, the active species should be supported as a film on the structured carrier, in order to allow simultaneous soot filtration and combustion. This review focuses on the most recent advances in the development of structured catalysts for diesel engine catalytic soot combustion, characterized by different active species and supports, as well as by different geometric configurations (monoliths, foams, ceramic papers, or wire mesh); the most important peculiar properties are highlighted and summarized. Moreover, a critical review of the most recent advances in modeling studies is also presented in this paper. In addition, some highlights on some of the most recent alternative approaches proposed for limiting the soot emissions from diesel engines have been given, delineating feasible alternatives to the classical strategies nowadays used.

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Application Study on a New Hybrid Canning Structure of After-Treatment System for Diesel Engine

Cited by 6 publications

References 24 publications

A study on the high-efficiency mixer of the SCR system

A study on the high-efficiency mixer of the SCR system

A 1D–3D Approach for Fast Numerical Analysis of the Flow Characteristics of a Diesel Engine Exhaust Gas

Most Recent Advances in Diesel Engine Catalytic Soot Abatement: Structured Catalysts and Alternative Approaches

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