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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Comprehensive performance test of diesel engine aftertreatment system based on China VI standard

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基于国Ⅵ柴油机后处理系统综合性能试验研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Oct.2023, Vol.46 No.10: 1349-1354, 1368

DOI: 10.3969/j.issn.1003-5060.2023.10.008

Authors

CHENG Xiaozhang, LIU Fan, ZHANG Zihan, GUAN Jinbiao, WANG Tao

(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to study the performance of the diesel engine aftertreatment system, this paper builds a diesel engine aftertreatment test bench based on China V| standard, and adopts the aftertreatment technology route with diesel oxidation catalyst(DOC), diesel particulate filter(DPF), selective catalytic reduction(SCR) and ammonia slip catalyst(ASC). The test first corrected the temperature and $ NO_{x} $ sensor deviation in the aftertreatment bench, which improved the accuracy of the test. Then, the relationship between engine power and emission performance was explored through experiments, and the relationship between temperature, $ NH_{3} $ storage capacity and $ NO_{x} $ conversion rate at a certain exhaust gas flow was studied. The results show that when the engine is at the maximum torque point, the exhaust gas temperature and fuel consumption rate reach the maximum, and the emission performance is poor; the $ NO_{x} $ conversion rate increases with the increase of $ NH_{3} $ storage, and the $ NH_{3} $ storage decreases with the increase of temperature. In addition, the influence of the DPF carrier coating on the aftertreatment performance was explored, and it is shown that the carrier with an alkali metal coating has little effect on the engine emission performance.

Keywords: aftertreatment system; engine power performance; $ NO_{x} $ conversion rate; $ NH_{3} $ storage capacity; coating

作者信息

程晓章，刘凡，张子涵，管金彪，王涛

（合肥工业大学汽车与交通工程学院，安徽合肥230009）

摘要和关键词

摘要: 为了研究柴油机后处理系统性能,文章搭建基于国Ⅵ标准下的柴油机后处理试验台架,采用柴油机氧化催化器(diesel oxidation catalyst, DOC)+柴油颗粒捕集器(diesel particulate filter, DPF)+选择性催化还原(selective catalytic reduction, SCR)+氨氧化催化器(ammonia slip catalyst, ASC)后处理技术路线进行试验。首先校对后处理台架中的温度和氮氧化物 $ \left(\mathrm{NO}_{x}\right) $传感器偏差,提升试验的精确性;然后通过试验研究发动机动力性能与排放性能之间的关系,分析在一定废气流量下温度、氨 $ \left(\mathrm{NH}_{3}\right) $存储量和 $ NO_{x} $转化率之间的关系;最后探究DPF载体涂敷层对后处理性能的影响。结果表明:发动机在最大转矩点,排气温度、油耗率达到最大,排放性能较差; $ NO_{x} $转化率随着 $ NH_{3} $存储量的增加而增加, $ NH_{3} $存储量随着温度的增加而降低;载体涂敷碱金属涂层后对发动机排放性能的影响较小。

关键词: 后处理系统；发动机动力性； $ NO_{x} $ 转化率； $ NH_{3} $ 存储量；涂敷层

Funding

合肥工业大学产学研校企合作资助项目（W2018JSKF0594）

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