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A method for estimating the temperature downstream of the SCR (selective catalytic reduction) catalyst in diesel engines

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  • Qiu, Tao
  • Li, Xuchu
  • Liang, Hong
  • Liu, Xinghua
  • Lei, Yan

Abstract

Because of the stringent nitrogen oxides (NOx) emissions legislation for heavy-duty diesel engines, the SCR (selective catalytic reduction) has been investigated by many researchers. The objective of these studies is to investigate the reasons why the temperature downstream of the SCR catalyst is not always equal to that upstream with a commercial V2O5 catalyst applied in a heavy-duty diesel engine. Using the energy conservation equation and SCR reaction model, a method for estimating the exhaust gas temperature downstream of the catalyst was proposed. The SCR downstream temperature was calculated and experimentally measured under the standard ESC (European steady-state cycle) and different speeds and torques. The results indicated that when the diesel engine operated under steady-state conditions, the temperature downstream of the catalyst was similar to that upstream. Compared with the change of the temperature upstream of the catalyst, the change of downstream is delayed under unsteady-state conditions. According to the analysis, the main reason for this result is that temperature gradients exist along the substrate channels, accounting for inter-phase (gas–solid) heat transfer. The downstream temperature estimation is important for confirming the SCR catalyst temperature.

Suggested Citation

  • Qiu, Tao & Li, Xuchu & Liang, Hong & Liu, Xinghua & Lei, Yan, 2014. "A method for estimating the temperature downstream of the SCR (selective catalytic reduction) catalyst in diesel engines," Energy, Elsevier, vol. 68(C), pages 311-317.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:311-317
    DOI: 10.1016/j.energy.2014.02.101
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    References listed on IDEAS

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    Cited by:

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    2. Wejkowski, Robert & Wojnar, Wacław, 2018. "Selective catalytic reduction in a rotary air heater (RAH-SCR)," Energy, Elsevier, vol. 145(C), pages 367-373.
    3. Myung, Cha-Lee & Jang, Wonwook & Kwon, Sangil & Ko, Jinyoung & Jin, Dongyoung & Park, Simsoo, 2017. "Evaluation of the real-time de-NOx performance characteristics of a LNT-equipped Euro-6 diesel passenger car with various vehicle emissions certification cycles," Energy, Elsevier, vol. 132(C), pages 356-369.
    4. Kang, Lulu & Lou, Diming & Zhang, Yunhua & Fang, Liang & Luo, Chagen, 2023. "Research on cross sensitivity of NOx sensor and Adblue injection volume in accordance with the actual situation based on cubature Kalman filter," Energy, Elsevier, vol. 284(C).
    5. Hasannuddin, A.K. & Wira, J.Y. & Sarah, S. & Ahmad, M.I. & Aizam, S.A. & Aiman, M.A.B. & Watanabe, S. & Hirofumi, N. & Azrin, M.A., 2016. "Durability studies of single cylinder diesel engine running on emulsion fuel," Energy, Elsevier, vol. 94(C), pages 557-568.
    6. Wei, Li & Yan, Fuwu & Hu, Jie & Xi, Guangwei & Liu, Bo & Zeng, Jiawei, 2017. "Nox conversion efficiency optimization based on NSGA-II and state-feedback nonlinear model predictive control of selective catalytic reduction system in diesel engine," Applied Energy, Elsevier, vol. 206(C), pages 959-971.
    7. Song, Heping & Liu, Changpeng & Li, Yanfei & Wang, Zhi & Chen, Longfei & He, Xin & Wang, Jianxin, 2018. "An exploration of utilizing low-pressure diesel injection for natural gas dual-fuel low-temperature combustion," Energy, Elsevier, vol. 153(C), pages 248-255.

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