The Effect of Exhaust Temperature on Urea-Water Decomposition in Marine SCR Systems

Year 2019, Volume: 5 Issue: 3, 112 - 118, 30.11.2019

Kubilay Bayramoğlu , Güner Özmen A. Güldem Cerit

https://doi.org/10.22399/ijcesen.578973

Abstract

Reduction
of nitrogen oxide (NO_x) emissions from ships due to environmental
pollution and greenhouse gas impact has been made obligatory by regulations
introduced by the International Maritime Organization (IMO). Basically, NO_x
emission control mechanisms are divided into primary methods and
after-treatment methods. After-treatment methods focus on reducing NO_x
emissions from the exhaust gas by various methods. In this study, the
efficiency of the urea transformation for different exhaust temperature values
for a modelled Selective Catalytic Reduction (SCR) system has been investigated
numerically. As a result of numerical model, isocyanic acid, temperature, urea
and ammonia values have been determined for Urea-Water Solutions (UWS) process
values. The study has been calculated by the computational fluid dynamics (CFD).
The numerical results obtained were confirmed by experimental studies from the
literature.

Keywords

Marine SCR, Simulation, NOxReduction, Urea decomposition

References

• [1] Tian X. ‘Study on mixing , modelling and control of an SCR system’. Doctor of Philosophy, Strathclyd (2016).
• [2] Guo Y, Deng Y, Zhang J, Shen Y, Wilson C. ‘Experimental and numerical analysis of NOx reduction in marine urea-SCR system’. International Conference on Information, Cybernetics, and Computational Social Systems, (2017) 450–5. 10.1109/ICCSS.2017.8091457.
• [3] Kilpinen P. ‘Optimization of a simplified sub-model for NO emission prediction by CFD in large 4-stroke marine diesel engines’. Fuel Processing Technology, 91(2) (2010) 218–28. 10.1016/J.FUPROC.2009.10.001.
• [4] Tan L, Feng P, Yang S, Guo Y, Liu S, Li Z. ‘CFD studies on effects of SCR mixers on the performance of urea conversion and mixing of the reducing agent’. Chemical Engineering and Processing: Process Intensification, 123 (2018) 82–8. 10.1016/J.CEP.2017.11.003.
• [5] Sadashiva Prabhu S, Nayak NS, Kapilan N, Hindasageri V. ‘An experimental and numerical study on effects of exhaust gas temperature and flow rate on deposit formation in Urea-Selective Catalytic Reduction (SCR) system of modern automobiles’. Applied Thermal Engineering, 111 (2017) 1211–31. 10.1016/J.APPLTHERMALENG.2016.09.134.
• [6] Um HS, Kim D, Kim KH. ‘Numerical study on the design of urea decomposition chamber in LP SCR system’. International Journal of Naval Architecture and Ocean Engineering, (2018). 10.1016/J.IJNAOE.2018.06.005.
• [7] Capetillo A, Ibarra F. ‘Multiphase injector modelling for automotive SCR systems: A full factorial design of experiment and optimization’. Computers & Mathematics with Applications, 74(1) (2017) 188–200. 10.1016/J.CAMWA.2017.01.025.
• [8] Ström H, Lundström A, Andersson B. ‘Choice of urea-spray models in CFD simulations of urea-SCR systems’. Chemical Engineering Journal, 150(1) (2009) 69–82. 10.1016/J.CEJ.2008.12.003.
• [9] Shen B, Li Z, Li J, Kong X, He L, Song J, et al. ‘Development of a 1D Urea-SCR system model coupling with wall film decomposition mechanism based on engine bench test data’. Energy Procedia, 142 (2017) 3492–7. 10.1016/J.EGYPRO.2017.12.235.
• [10] Kim JY, Ryu SH, Ha JS. ‘Numerical Prediction on the Characteristics of Spray-Induced Mixing and Thermal Decomposition of Urea Solution in SCR System’. Fall Technical Conference of the ASME Internal Combustion Engine Division, (2004) 165–70. 10.1115/icef2004-0889.
• [11] Birkhold F, Meingast U, Wassermann P, Deutschmann O. ‘Analysis of the Injection of Urea-Water-Solution for Automotive SCR DeNOx-Systems: Modeling of Two-Phase Flow and Spray/Wall-Interaction’. SAE International, (2006). 10.4271/2006-01-0643.
• [12] Birkhold F, Meingast U, Wassermann P, Deutschmann O. ‘Modeling and simulation of the injection of urea-water-solution for automotive SCR DeNOx-systems’. Applied Catalysis B: Environmental, 70(1–4) (2007) 119–27. 10.1016/J.APCATB.2005.12.035.
• [13] Park, K., Hong, C.-H., Oh, S., and Moon, S. (2014). Numerical Prediction on the Influence of Mixer on the Performance of Urea-SCR System. International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, 8 (5): 998–1004.
• [14] Millo F, Rafigh M, Fino D, Miceli P. ‘Application of a global kinetic model on an SCR coated on Filter (SCR-F) catalyst for automotive applications’. Fuel, 198 (2017) 183–92. 10.1016/J.FUEL.2016.11.082.
• [15] Nguyen, T.D.B., Lim, Y.-I., Eom, W.-H., Kim, S.-J., and Yoo, K.-S. (2010). Experiment and CFD simulation of hybrid SNCR–SCR using urea solution in a pilot-scale reactor. Computers & Chemical Engineering, 34 (10): 1580–1589. 10.1016/J.COMPCHEMENG.2009.12.012.
• [16] Nguyen, T.D.B., Kang, T.H., Lim, Y. Il, Eom, W.H., Kim, S.J., and Yoo, K.S. (2009). Application of urea-based SNCR to a municipal incinerator: On-site test and CFD simulation. Chemical Engineering Journal, 152 (1): 36–43. 10.1016/j.cej.2009.03.025.
• [17] Bayramoğlu K, Yilmaz S, Kaya KD. ‘Numerical and Theoretical Thermal Analysis of Ship Provision Refrigeration System’. Journal of ETA Maritime Science, 7(2) (2019) 137–49. DOI ID: 10.5505/jems.2019.30922.
• [18] Baleta J, Vujanović M, Pachler K. ‘Numerical modeling of urea water based selective catalytic reduction for mitigation of NOx from transport sector’. Journal of Cleaner Production, 88 (2015) 280–8. 10.1016/J.JCLEPRO.2014.06.042.
• [19] Baleta J, Martinjak M, Vujanović M, Pachler K, Wang J, Duić N. ‘Numerical analysis of ammonia homogenization for selective catalytic reduction application’. Journal of Environmental Management, 203 (2017) 1047–61. 10.1016/J.JENVMAN.2017.04.103.
• [20] Nishad K, Ries F, Janicka J, Sadiki A. ‘Analysis of spray dynamics of urea–water-solution jets in a SCR-DeNOx system: An LES based study’. International Journal of Heat and Fluid Flow, 70 (2018) 247–58. 10.1016/J.IJHEATFLUIDFLOW.2018.02.017.
• [21] Choi C, Sung Y, Choi GM, Kim DJ. ‘Numerical analysis of NOx reduction for compact design in marine urea-SCR system’. International Journal of Naval Architecture and Ocean Engineering, 7(6) (2015) 1020–34. 10.1515/IJNAOE-2015-0071.
• [22] Wu B, Tang G, Chen X, Zhou CQ, Colella CP, Okosun T. ‘Optimization of an urea decomposition chamber using CFD and VR’. Applied Thermal Engineering, 70(1) (2014) 827–37. 10.1016/J.APPLTHERMALENG.2014.05.044.
• [23] ANSYS. ‘ANSYS Fluent Theory Guide’. ANSYS 162 Documentation, 15317(July) (2015) 80. 10.1016/0140-3664(87)90311-2.
• [24] Xu Y, Zhang Y, Liu F, Shi W, Yuan J. ‘CFD analysis on the catalyst layer breakage failure of an SCR-DeNOx system for a 350 MW coal-fired power plant’. Computers & Chemical Engineering, 69 (2014) 119–27. 10.1016/J.COMPCHEMENG.2014.07.012.
• [25] Birkhold F, Meingast U, Wassermann P, Deutschmann O. ‘Modeling and simulation of the injection of urea-water-solution for automotive SCR DeNOx-systems’. Applied Catalysis B: Environmental, 70(1–4) (2007) 119–27. 10.1016/J.APCATB.2005.12.035.
• [26] Bayramoğlu K. MSc Thesis. ‘HAD (Hesaplamalı Akışkanlar Dinamiği) Yöntemiyle Gemi Dizel Motorlarinda Yanma Analizi’. 2018.