Meeting future NOX emission regulations by adding an electrically heated mixer
Meeting future NOX emission regulations by adding an electrically heated mixer
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通过添加电加热混合器满足未来的氮氧化物排放法规
DOI：
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发表时间：
2022
影响因子：
4.5
通讯作者：
S. Noorfeshan
中科院分区：
文献类型：
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作者：
P. Meruva;A. Matheaus;C. Sharp;J. McCarthy;M. Masoudi;N. Poliakov;S. Noorfeshan
加州空气资源委员会（CARB）的新法规要求到2027年严格的0.02 g/hp-hr排气管NOx限制，要求选择性催化还原（SCR）催化剂即使在低（低于200°C）排气温度下也提供高NOx转化率。这项工作描述了利用电加热混合器系统（EHM系统）的点火选择性催化还原（LO-SCR）催化剂的上游，然后是一个传统的后处理（AT）系统包含DOC，DPF和SCR，使高NOx转化率满足CARB的NOx排放目标。将AT催化剂水热老化至完全使用寿命。在LO-SCR和主要下游SCR两者的上游注入常规未加热的柴油机排气流体（DEF）。EHM系统允许DEF在LO-SCR的上游低至130°C喷射，而在先前的研究中，未加热的DEF在180°C下喷射或在130°C下与加热的DEF一起投配。未加热的DEF、EHM系统、LO-SCR和下游SCR的组合使得能够在低排气温度下实现NOx效率的所需增加，这在诸如冷FTP、LLC、LLC、LLC、LLC、LHC和LHC的驱动循环中观察到。世界协调瞬态循环（WHTC）与其基线相比，使用这种配置的排气管NOx减少了几倍：FTP减少了3.3倍，低负荷循环（LLC）减少了22倍，饮料循环减少了38倍，“Stay Hot”循环减少了8倍，WHTC减少了10倍。最后，它表明，EHM系统可以加热废气，如在冷启动，而不需要额外的加热硬件集成到系统中。这些结果是在没有对发动机基础校准进行更改的情况下观察到的。
New regulations by the California Air Resources Board (CARB) demand a stringent 0.02 g/hp-hr tailpipe NOx limit by the year 2027, requiring Selective Catalytic Reduction (SCR) catalysts to provide high NOx conversions even at low (below 200°C) exhaust temperatures. This work describes utilizing an Electrically Heated Mixer System (EHM system) upstream of a Light-Off Selective Catalytic Reduction (LO-SCR) catalyst followed by a conventional aftertreatment (AT) system containing DOC, DPF, and SCR, enabling high NOx conversions meeting CARB’s NOx emission target. The AT catalysts were hydrothermally aged to Full Useful Life. Conventional unheated Diesel Exhaust Fluid (DEF) was injected upstream of both the LO-SCR and primary downstream SCR. The EHM system allowed for DEF to be injected as low as 130°C upstream of the LO-SCR, whereas, in previous studies, unheated DEF was injected at 180°C or dosed at 130°C with heated DEF. The combination of unheated DEF, EHM system, LO-SCR, and downstream SCR enabled the needed increase in NOx efficiency in low exhaust temperatures, which was observed in drive cycles such as in cold-FTP, LLC, and World Harmonized Transient Cycle (WHTC). There were several-fold reductions in tailpipe NOx using this configuration compared to its baseline: 3.3-fold reduction in FTP, 22-fold in Low Load Cycle (LLC), 38-fold in Beverage Cycle, 8-fold in “Stay Hot” Cycle, and 10-fold in WHTC. Finally, it is shown that the EHM system can heat the exhaust gas, such as during a cold start, without needing additional heating hardware integrated into the system. These results were observed without performing changes in the engine base calibration.
加热 AdBlue/DEF 混合器，可在低温驾驶循环、RDE 和城市驾驶中高效减少氮氧化物
影响因子：
3.6
作者：
Masoudi, M.;Poliakov, N.;Noorfeshan, S.;Hensel, J. and
通讯作者：
Hensel, J. and
一种新型电加热混合器 (EHM)，可在低负载循环中高效去除 NOx
影响因子：
--
作者：
Masoudi, M;Poliakov, N.;and Noorfeshan, S.
通讯作者：
and Noorfeshan, S.