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Research on coordination control of N2O and NOx in dual-stage SCR system
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Shenggang Guo1, 2, 3, Fuyuan Yang1, Nannan Sun2, 3, Zhihua Lyu2, 3
Transactions of CSICE | 2025, 43(3) : 232 - 240
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Transactions of CSICE | 2025, 43(3): 232-240
Research on coordination control of N2O and NOx in dual-stage SCR system
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Shenggang Guo1, 2, 3, Fuyuan Yang1, Nannan Sun2, 3, Zhihua Lyu2, 3
Affiliations
  • 1.School of Vehicle and Mobility，Tsinghua University，Beijing 100084，China
  • 2.Weichai Power Company Limited，Weifang 261061，China
  • 3.State Key Laboratory of Engine and Powertrain System，Weifang 261061，China
Published: 2025-05-25 doi: 10.16236/j.cnki.nrjxb.202503027
Outline
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A dual-stage selective cataiytic reduction(SCR) system effectively reduces NOx emissions during cold start-up by adding a close-coupled SCR in the upstream position. However, copper-based SCR produces more N2O in the low temperature section. In order to reduce N2O emission, a vanadium-based SCR catalyst is selected for the close-coupled SCR, and a copper-based SCR catalyst is selected for the downstream position. This selected aftertreatment system can not only reduce NOx emissions at low temperatures, but also limit N2O emission to lower levels. In this paper, vanadium-based and copper-based SCR catalyst models were built using AVL CruiseM simulation software, and N2O chemical reaction kinetics equations were added to the models. The influence of urea injection amount and NO2 ratio on NOx and N2O emissions was studied by simulation, and coordination control of N2O and NOx was verified by experiment. The results show that the co-control of NOx and N2O emission can be achieved by selecting the vanadium-based SCR catalyst at the front and the copper-based SCR catalyst in the downstream SCR.

dual-stage selective cataiytic reduction  /  NOx emission  /  N2O emission  /  coordination control
郭圣刚, 杨福源, 孙楠楠, 吕志华. 双级SCR系统中N2O和NOx协调技术研究. 内燃机学报, 2025 , 43 (3) : 232 -240 . DOI: 10.16236/j.cnki.nrjxb.202503027
Shenggang Guo, Fuyuan Yang, Nannan Sun, Zhihua Lyu. Research on coordination control of N2O and NOx in dual-stage SCR system[J]. Transactions of CSICE, 2025 , 43 (3) : 232 -240 . DOI: 10.16236/j.cnki.nrjxb.202503027
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Year 2025 volume 43 Issue 3
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Article Info
doi: 10.16236/j.cnki.nrjxb.202503027
  • Receive Date：2024-07-11
  • Online Date：2026-11-06
  • Published：2025-05-25
Article Data
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History
  • Received：2024-07-11
  • Revised：2025-02-11
Funding
Affiliations
    1.School of Vehicle and Mobility，Tsinghua University，Beijing 100084，China
    2.Weichai Power Company Limited，Weifang 261061，China
    3.State Key Laboratory of Engine and Powertrain System，Weifang 261061，China
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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