Experimental Investigation of Combined LNT + SCR Diesel Exhaust Aftertreatment
Experimental Investigation of Combined LNT + SCR Diesel Exhaust Aftertreatment
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组合式LNT SCR柴油机尾气后处理实验研究
DOI：
10.1007/s40825-015-0012-0
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发表时间：
2015
影响因子：
1.6
通讯作者：
S. Pischinger
中科院分区：
文献类型：
--
作者：
T. Wittka;B. Holderbaum;P. Dittmann;S. Pischinger
在本工作中，开发了一种排气后处理系统，该系统采用稀薄NOX捕集器(LNT)+排气旁路、被动选择性催化还原催化剂(SCR)和车载排气燃料重整供应非发动机LNT还原剂相结合的系统。此外，在发动机试验台上进行了稳态运行的实验研究，并在样车上进行了道路试验。深入研究了LNT再生过程中固有的NH3生成作为无活性尿素投加的被动式SCR的关键作用。LNT再生时间和温度是影响NH3排放的最重要参数。在稳态运行时，被动式SCR对总NOX转化率的贡献最高可达35%。在170℃时，可以实现50%的稳态总NOX转化；在250℃和2%的燃油消耗损失下，可以实现完全的NOX转化。与发动机频繁浓缩的传统LNT操作相比，发动机不依赖发动机的重整气LNT再生在能量上更高效，在二氧化碳排放方面也更有利。此外，通过将NOX减排从LNT转换为SCR，可以减少由于LNT浓缩而造成的燃油消耗损失。最后，在瞬变测试循环和道路实际行驶中对该组合系统进行了验证。
In the present work, an exhaust aftertreatment system combining lean NOXtrap (LNT) plus exhaust bypass, passive selective catalytic reduction catalyst (SCR) and engine-independent LNT reductant supply by onboard exhaust fuel reforming was developed. Further, it was experimentally investigated in steady-state operation on an engine test bench and on road in a demonstrator vehicle. The intrinsic NH3formation during the LNT regeneration was intensively studied as one key function for passive SCR without active urea dosing. LNT regeneration duration and temperature are the most significant parameters for NH3emission. In steady-state operation, the passive SCR could be forced to a contribution to the total NOXconversion of up to 35 %. At 170 °C, 50 % steady-state total NOXconversion was achieved, and at 250 °C and a fuel consumption penalty of <2 %, complete NOXconversion could be demonstrated. Compared to conventional LNT operation with frequent engine enrichment, the engine-independent LNT regeneration with reformate gas is energetically more efficient and advantageous regarding CO2emissions. Additionally, by shifting NOXreduction from LNT to SCR, fuel consumption penalty due to LNT enrichment can be reduced. Finally, the combination system was demonstrated in transient test cycles and by real driving operation on road.
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影响因子：
1
作者：
Lifeng Xu;R. McCabe;M. Dearth;W. Ruona
通讯作者：
Lifeng Xu;R. McCabe;M. Dearth;W. Ruona
不同再生定时方案对模型 NOX 存储/还原催化剂性能的影响
影响因子：
5.3
作者：
M. Al‐Harbi;W. Epling
通讯作者：
W. Epling
影响因子：
5.3
作者：
S. Mulla;S. S. Chaugule-S.;A. Yezerets;N. Currier;W. Delgass;F. Ribeiro
通讯作者：
S. Mulla;S. S. Chaugule-S.;A. Yezerets;N. Currier;W. Delgass;F. Ribeiro
影响因子：
1.9
作者：
K. Okumura;T. Motohiro;Y. Sakamoto;H. Shinjoh
通讯作者：
K. Okumura;T. Motohiro;Y. Sakamoto;H. Shinjoh
影响因子：
22.1
作者：
Yi Liu;M. Harold;D. Luss
通讯作者：
Yi Liu;M. Harold;D. Luss