C3H6、SO2和温度对非热等离子体促进NH3-SCR混合反应器系统减少柴油机尾气NOx排放的影响

IF 3.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Bin Guan, Junyan Chen, Zhongqi Zhuang, Lei Zhu, Zeren Ma, Xuehan Hu, Chenyu Zhu, Sikai Zhao, Kaiyou Shu, Hongtao Dang, Junjie Gao, Luyang Zhang, Tiankui Zhu, Zhen Huang
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引用次数: 0

摘要

通过一系列实验研究了C3H6、SO2、温度及其组合对等离子体促进NH3-SCR混合反应器(PFSHR)系统综合性能的影响。C3H6的加入极大地改变了介质阻挡放电(DBD)过程中NO氧化的途径,可以有效地促进NO氧化为NO2,使其更容易实现快速SCR反应,从而显著提高了低温下NOx的还原效果。此外,由于DBD具有较强的选择性氧化作用,NO氧化为NO2的速率远高于SO2氧化为SO3的速率,这是PFSHR系统具有较强的抗SO2中毒能力和耐久性的重要因素之一。此外,在250℃以下的低温条件下,SO2对PFSHR体系的活性有一定的抑制作用,而在中高温条件下,对NOx的去除效率有一定的促进作用。此外,在250°C以下,PFSHR系统的NOx减排效率受到SIED的显著影响,而在250°C以上,NOx的还原变化相对平稳,这表明dbd辅助SCR在低温下对NOx的还原是有效的。随着DBD反应器温度的升高,NO氧化为NO2的效率和C3H6的分解速率下降,但不影响高温下NOx的还原。此外,在PFSHR系统中产生了一些调控副产物N2O和CO以及调控副产物HCHO和CH3CHO, HCHO和CH3CHO可以有效地参与SCR反应,进一步提高NOx的去除效率,导致PFSHR系统出口只有少量的HCHO和CH3CHO残留物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of C3H6, SO2, and Temperatures on the Nonthermal Plasma-Facilitated NH3–SCR Hybrid Reactor System to Reduce NOx from Diesel Engine Exhaust

Effects of C3H6, SO2, and Temperatures on the Nonthermal Plasma-Facilitated NH3–SCR Hybrid Reactor System to Reduce NOx from Diesel Engine Exhaust
An extensive series of experiments have been conducted to investigate the effects of C3H6, SO2, temperatures, and their combination on the comprehensive performance of the plasma-facilitated NH3–SCR hybrid reactor (PFSHR) system. The addition of C3H6 drastically changes the pathway of NO oxidation in the process of dielectric barrier discharge (DBD), which can efficiently promote the oxidation of NO to NO2, making it easier to achieve the fast SCR reaction and thus significantly improve the NOx reduction at lower temperatures. In addition, the oxidation rate of NO to NO2 is much higher than that of SO2 to SO3 due to the strong selective oxidation of DBD, which is one of the most important factors attributing to the robust resistance to SO2 poisoning and the durability of the PFSHR system. Besides, SO2 has some inhibiting effects on the activity of the PFSHR system at low temperatures below 250 °C, while the NOx removal efficiency can be facilitated to a certain extent at medium to high temperatures. Moreover, the NOx abatement efficiency of the PFSHR system is remarkably influenced by the SIED below 250 °C, and the change of NOx reduction is relatively flat above 250 °C, which indicates that it is efficient for the DBD-assisted SCR to reduce NOx at low temperatures. Additionally, the efficiency of NO oxidation to NO2 and the C3H6 decomposition rate drops with the increase of the DBD reactor temperature, which, however, does not affect the NOx reduction at high temperatures. Furthermore, some regulated byproducts, N2O and CO, and unregulated byproducts, HCHO and CH3CHO, generated in the PFSHR system, from which HCHO and CH3CHO can efficiently participate in the SCR reactions and further enhance the NOx removal efficiency, result in only a small amount of HCHO and CH3CHO residue at the outlet of the PFSHR system.
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来源期刊
Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research 工程技术-工程:化工
CiteScore
7.40
自引率
7.10%
发文量
1467
审稿时长
2.8 months
期刊介绍: ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.
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