Advertisement

Combustion and emission characteristics for a marine low-speed diesel engine with high-pressure SCR system

  • Yuanqing Zhu
  • Chong Xia
  • Majed Shreka
  • Zhanguang Wang
  • Lu Yuan
  • Song Zhou
  • Yongming FengEmail author
  • Qichen Hou
  • Salman Abdu Ahmed
Sustainable development of energy, water and environment systems
  • 27 Downloads

Abstract

In order to avoid the production of sulfates and nitrates in marine diesel engines that burn sulfur-containing fuels, the operating temperature of their high-pressure selective catalytic reduction (HP-SCR) systems should be higher than 320 °C. For marine low-speed diesel engines, only the pre-turbine exhaust gas temperature can meet this requirement under specific conditions, with the main engine modulation method helping to increase the exhaust gas temperature. However, the main engine modulation method brings down the power output and fuel economy of the main engine and causes the matching problem of the turbine and the other devices with the main engine. The original engine model of the marine low-speed diesel engine and the high-pressure SCR system configuration model have been constructed using one-dimensional simulation software. In addition, the performance of the high-pressure SCR system under the conditions of low-sulfur and high-sulfur exhaust gas was thoroughly analyzed. Moreover, the two main engine modulation schemes of the scavenging bypass and the turbine exhaust bypass of the original engine matching with the high-pressure SCR system were studied. The study found that the weighted average value of the NOx under the condition of low-sulfur exhaust gas met with the requirement of the IMO Tier III regulations when the low-speed diesel engine was matched with the high-pressure SCR system. However, the weighted average value of the NOx under the condition of high-sulfur exhaust gas was slightly higher than that required by the IMO Tier III regulation. In addition, the optimal main engine modulation scheme for this low-speed diesel engine was clarified by comparing the effects of the scavenging bypass and the turbine exhaust bypass modulation on the exhaust performance, and the working performance of the original engine. With an opening of 0.4 of the CBV valve under 25% engine load, the weighted average NOx of the original exhaust gas was 3.38 g/(kW·h), the power had decreased by 0.7%, and the fuel consumption had increased by 1.0%. Furthermore, when the EGB valve opening was 0.3, the weighted average value of NOx was 3.31 g/(kW·h), the power had reduced by 2.4% and the fuel consumption had increased by 2.5%. Both modulation scheme methods made the exhaust performance of the original engine meet the requirements of the IMO Tier III emission regulations, but the scavenging bypass modulation scheme had less impact on the original engine’s performance.

Keywords

High-pressure SCR system Low-speed diesel engine Main engine modulation Matching performance Simulation calculation 

Notes

Funding information

This study was supported by the National Key Research and Development Program of China (No. 2016YFC0205400) and the Provincial Funding for National Projects of Heilongjiang Province in China (No. GX17A020).

References

  1. Adjustment plan for marine emission control areas - draft for soliciting opinions (2018) Ministry of Transport of the People’s Republic of China, BeijingGoogle Scholar
  2. Ayodhya AS, Narayanappa KG (2018) An overview of after-treatment systems for diesel engines. Environ Sci Pollut Res 25:35034–35047CrossRefGoogle Scholar
  3. Cai XX, Sun W, Xu CC, Cao LM (2016) Highly selective catalytic reduction of NO via SO2/H2O-tolerant spinel catalysts at low temperature. Environ Sci Pollut Res 23:18609–18620CrossRefGoogle Scholar
  4. Chen CM, Cao Y, Liu ST, Chen JM, Jia WB (2018) Review on the latest developments in modified vanadium-titanium-based SCR catalysts. Chin J Catal 39:1347–1365CrossRefGoogle Scholar
  5. Christensen H, Pedersen MF, Skjoldager P, Fam M (2011) Tier III SCR for large 2-stroke MAN B&W diesel engines. In: Proceedings of the International Symposium on Marine Engineering (ISME), Kobe and Japan, Paper No. 587Google Scholar
  6. Ciardelli C, Nova I, Tronconi E, Chatterjee D, Bandl-Konrad B, Weibel M, Krutzsch B (2007a) Reactivity of NO/NO2-NH3 SCR system for diesel exhaust aftertreatment: identification of the reaction network as a function of temperature and NO2 feed content. Appl Catal B Environ 70:80–90CrossRefGoogle Scholar
  7. Ciardelli C, Nova I, Tronconi E, Chatterjee D, Burkhardt T, Weibel M (2007b) NH3 SCR of NOx for diesel exhausts aftertreatment: role of NO2 in catalytic mechanism, unsteady kinetics and monolith converter modelling. Chem Eng Sci 62:5001–5006CrossRefGoogle Scholar
  8. CIMAC Working Group WG5 - Exhaust Emissions Control (2008) Guide to diesel exhaust emissions control of NOx, SOx, particulates, smoke and CO2-Seagoing ships and large stationary diesel power plants. The International Council on Combustion Engines, CIMAC congress. CIMAC Position Paper. Available online: https://www.cimac.com/cms/upload/Publication_Press/Recommendations/Recommendation_28.pdf
  9. Döring A, Bugsch M, Hetzer J, et al. (2016) The MAN SCR system – more than just fulfilling IMO Tier III. IN: 28th CIMAC Congress, Helsinki, Finland, Paper No. 26Google Scholar
  10. Ebrahimian V, Nicolle A, Habchi C (2012) Detailed modeling of the evaporation and thermal decomposition of urea-water solution in SCR systems. AICHE J 58(7):1998–2009CrossRefGoogle Scholar
  11. Exhaust aftertreatment-Application Manual (2016) Gamma Technologies, LLC, USGoogle Scholar
  12. Final report of the correspondence group on assessment of technological developments to implement the Tier III NOx emission standards under MARPOL Annex VI (2013) International Maritime OrganizationGoogle Scholar
  13. Fung F, Zhu ZX, Becque R, Finamore B (2014) Prevention and control of shipping and port air emissions in China. Natural Resources Defense Council, BeijingGoogle Scholar
  14. Li X, Li XS, Yang RT, Mo JS, Li JH, Hao JM (2017a) The poisoning effects of calcium on V2O5-WO3/TiO2 catalyst for the SCR reaction: comparison of different forms of calcium. Mol Catal 434:16–24CrossRefGoogle Scholar
  15. Li XS, Liu CD, Li X, Peng Y, Li JH (2017b) A neutral and coordination regeneration method of Ca-poisoned V2O5-WO3/TiO2 SCR catalyst. Catal Commun 100:112–116CrossRefGoogle Scholar
  16. Ma SC, Jin X, Sun YX, Cui JW (2010) The formation mechanism of ammonium bisulfate in SCR flue gas denitrification process and control. Therm Power Gener 8:12–17Google Scholar
  17. MAN Energy Solutions SE (2018) MAN B&W Two-stroke marine engines emission project guide for MARPOL Annex VI regulations, 9th edn. MAN Diesel & Turbo. Available online: https://marine.manes.com/applications/projectguides/2stroke/content/special_pg/7020-0145-09_uk.pdf
  18. Nova I, Ciardelli C, Tronconi E, Chatterjee D, Bandl-Konrad B (2006) NH3–NO/NO2 chemistry over V-based catalysts and its role in the mechanism of the fast SCR reaction. Catal Today 114:3–12CrossRefGoogle Scholar
  19. Nova I, Ciardelli C, Tronconi E, Chatterjee D, Weibel M (2007) NH3-NO/NO2 SCR for diesel exhausts after treatment: mechanism and modelling of a catalytic converter. Top Catal 42-43:43–46CrossRefGoogle Scholar
  20. Ryu C, Hwang J, Cheon J et al (2016) The world’s first commercialized low-pressure SCR system on 2-stroke engine DeNOx system. In: 28th CIMAC World Congress on Combustion Engines, Helsinki, Finland, Paper No. 305Google Scholar
  21. Sandelin K, Peitz D (2016) SCR under pressure - pre-turbocharger NOx abatement for marine 2-stroke diesel engines. In: 28th CIMAC World Congress on Combustion Engines, Helsinki, Finland, Paper No. 111Google Scholar
  22. Thogersen JR, Slabiak T, White N (2010) Ammonium bisulphate inhibition of SCR catalysts. Haldor Topsoe A/S, DanmarkGoogle Scholar
  23. Topsoe NY, Topsoe H, Dumesic JA (1995) Vanadia/titania catalysts for selective catalytic reduction (SCR) of nitric oxide by ammonia 1. Combined temperature programmed in situ FTIR and on-line mass spectroscopy studies. J Catal 151:226–240CrossRefGoogle Scholar
  24. Topsoe NY, Dumesic JA, Topsoe H (1998) Vanadia/titania catalysts for selective catalytic reduction (SCR) of nitric oxide by ammonia 2. Studies of active sites and formulation of catalytic cycle. J Catal 151:241–252CrossRefGoogle Scholar
  25. Wang YJ, Ge DJ, Che MX, Gao S, Wu ZB (2018) A dual-functional way for regenerating NH3-SCR catalysts while enhancing their poisoning resistance. Catal Commun 117:69–73CrossRefGoogle Scholar
  26. Xie B, Luo H, Tang Q, Du J, Liu ZH, Tao CY (2017) The black rock series supported SCR catalyst for NOx removal. Environ Sci Pollut Res 24:21761–21769CrossRefGoogle Scholar
  27. Xu TF, Wu XD, Gao YX, Lin QW, Hu JF, Weng D (2017) Comparative study on sulfur poisoning of V2O5-Sb2O3/TiO2 and V2O5-WO3/TiO2 monolithic catalysts for low-temperature NH3-SCR. Catal Commun 93:33–36CrossRefGoogle Scholar
  28. Xue YD, Wang YT (2018) Effective industrial regeneration of arsenic poisoning waste selective catalytic reduction catalyst: contaminants removal and activity recovery. Environ Sci Pollut Res 25:34114–34122CrossRefGoogle Scholar
  29. Zhu Y, Hou Q, Shreka M, Yuan L, Zhou S, Feng Y, Xia C (2019) Ammonium-Salt Formation and Catalyst Deactivation in the SCR System for a Marine Diesel Engine. Catalysts.  https://doi.org/10.3390/catal9010021
  30. Zhu YQ, Zhang RP, Zhou S, Huang CN, Feng YM, Shreka M, Zhang CL (2018a) Performance optimization of high-pressure SCR system in a marine diesel. Part II: catalytic reduction and process. Top Catal.  https://doi.org/10.1007/s11244-018-1088-x
  31. Zhu YQ, Zhou S, Feng YM, Wang ZY (2018b) Influence of NH4NO3 formation on the NOx reduction pathways over vanadium-based catalyst under diesel exhaust conditions. Russ J Phys Chem A 92(8):1473–1480CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Power and Energy EngineeringHarbin Engineering UniversityHarbinPeople’s Republic of China

Personalised recommendations