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Spraying and Mixing Characteristics of Urea in a Static Mixer Applied Marine SCR System

Author

Listed:
  • Jaehwan Jang

    (School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Korea)

  • Sangkyung Na

    (School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Korea)

  • Heehwan Roh

    (STX Engine Co., Ltd., Gongdan-ro 474 36 beon-gil, Seongsan-gu Changwon, Gyengsangnamdo 51574, Korea)

  • Seongyool Ahn

    (Consortium for Research Engineer Education for Next Generation Smart Appliance, Pusan National University, Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Korea)

  • Gyungmin Choi

    (School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Korea)

Abstract

The most effective de-NOx technology in marine diesel applications is the urea-based selective catalytic reduction (SCR) system. The urea-SCR system works by injecting a urea solution into exhaust gas and converting this to NH 3 and CO 2 . The injection, mixing, and NH 3 conversion reaction behavior of the urea-water solution all have a decisive effect on the performance of the system. To improve de-NOx efficiency, it is important to provide enough time and distance for NH 3 conversion and uniform distribution prior to the solution entering the catalyst. In this study, therefore, the characteristics of gas flow, NH 3 conversion, and its distribution are investigated with a static mixer by means of numerical methods, providing a special advantage to ship manufacturing companies through the optimization of the urea-SCR system. The results show that the inclusion of the mixer induces strong turbulence and promotes the NH 3 conversion reaction across a wider region compared to the case without the mixer. The mean temperature is 10 °C lower due to the activated endothermic urea-NH 3 conversion reaction and the NH 3 concentration is 80 PPM higher at 1D than those without the mixer. Moreover, the uniformity of NH 3 distribution improved by 25% with the mixer, meaning that the de-NOx reaction can take place across all aspects of the catalyst thus maximizing performance. In other words, ship manufacturing companies have degrees of freedom in designing post-processing solutions for emissions by minimizing the use of the reduction agent or the size of the SCR system.

Suggested Citation

  • Jaehwan Jang & Sangkyung Na & Heehwan Roh & Seongyool Ahn & Gyungmin Choi, 2021. "Spraying and Mixing Characteristics of Urea in a Static Mixer Applied Marine SCR System," Energies, MDPI, vol. 14(18), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5788-:d:635041
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    References listed on IDEAS

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    1. Millstein, Dev E. & Harley, Robert A, 2010. "Effects of Retrofitting Emission Control Systems on In-Use Heavy Diesel Vehicles," University of California Transportation Center, Working Papers qt6k02k1fw, University of California Transportation Center.
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    Cited by:

    1. Yonmo Sung, 2023. "Advances in Reduction Technologies of Gas Emissions (CO 2 , NO x , and SO 2 ) in Combustion-Related Applications," Energies, MDPI, vol. 16(8), pages 1-4, April.

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