[1]李金成,尧命发,郑尊清,等.实现低NOx排放的紧耦合后处理器匹配[J].内燃机学报,2023,(02):141-149.
　Li Jincheng,Yao Mingfa,Zheng Zunqing,et al.A Close-Couple Aftertreatment Matching Research for Low NOx Emissions[J].,2023,(02):141-149.
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实现低NOx排放的紧耦合后处理器匹配
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《内燃机学报》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年02
页码:
141-149
栏目:
出版日期:
2023-03-25

文章信息/Info

Title:
A Close-Couple Aftertreatment Matching Research for Low NOx Emissions
作者:
李金成; 尧命发; 郑尊清; 王浒
天津大学 内燃机燃烧学国家重点实验室，天津 300350
Author(s):
Li Jincheng; Yao Mingfa; Zheng Zunqing; Wang Hu
State Key Laboratory of Engines，Tianjin University，Tianjin 300350，China
关键词:
重型柴油机; 低NOx排放; 紧耦合柴油氧化催化器; 转化效率
Keywords:
heavy-duty diesel engine; low NOx emission; close-couple diesel oxidation catalytic(DOC); conversion efficiency
分类号:
TK421.5
文献标志码:
A
摘要:
重型柴油机排放法规不断降低氮氧化物(NOx)限值，采用紧耦合选择性催化还原(SCR)是预期技术路线之一，但是否需采用紧耦合柴油氧化催化器(DOC)以改善紧耦合SCR入口NO2比例仍需要进一步探讨．通过一台商用柴油机，在GT-Power平台分别搭建DOC和SCR小样模型，基于小样试验数据和遗传算法对反应动力学机理参数进行初步标定，然后使用测试循环数据对机理参数进行修正，进而构建了DOC-DPF-SCR-ASC系统模型．基于系统模型对采用紧耦合DOC的必要性进行了探讨，结果表明：紧耦合DOC会增加紧耦合SCR前的热惯性，使紧耦合SCR的冷起动性能变差．基于系统模型还开展了两级SCR之间的体积匹配，可知柴油机采用主SCR体积为9.94L时，匹配紧耦合体积为2.13L的SCR可使系统冷起动工况SCR转化效率由63.0%提高到77.8%，NOx排放降低了42.4%；冷热世界统一瞬态循环(WHTC)加权后的NOx排放由0.38g/(kW·h)下降到0.21g/(kW·h)，降低了44.7%．
Abstract:
Heavy-duty diesel engine emission regulations continue to reduce NOx limits，and using close-couple selective catalytic reduction(SCR) is one of the expected technical routes. However，whether it is necessary to use a close-couple diesel oxidation catalytic(DOC) to improve the NO2 ratio at the inlet of the close-couple SCR still needs further investigation. The DOC and SCR sample models were respectively developed in this study based on GT-Power platform for a diesel engine. Initial calibration of reaction kinetic mechanism parameters based on small sample test data and genetic algorithms，a DOC-DPF-SCR-ASC combined system model was built by preliminary calibration，and then using the test cycle data to correct the mechanism parameters. Based on the system model，the necessity of using close-couple DOC was discussed，and the results show that close-couple DOC will increase the thermal inertia before the close-couple SCR and reduce the cold start performance of the close-couple SCR. A volume matching study between the two-stage SCRs was also carried out. When the main SCR volume is 9.94L，matching the close-couple SCR with a volume of 2.13L can make the SCR conversion efficiency under cold start to increase from 63.0% to 77.8% and NOx is decreased by 42.4%. NOx specific emissions obtained on hot and cold world harmonized transient cycle(WHTC) operating cycles are decreased from 0.38g/(kW·h) to 0.21g/ (kW·h)，a decrease of 44.7%.

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　Li Linpeng,Mao Bin,Zheng Zunqing,et al.Effect of Gasoline/Diesel and n-Butanol/Diesel Blends on Combustion and Emissions of PPCI[J].,2020,(02):289.
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更新日期/Last Update: 2023-03-25