The effect of exhaust gas composition on the kinetics of soot oxidation and diesel particulate filter regeneration
The effect of exhaust gas composition on the kinetics of soot oxidation and diesel particulate filter regeneration
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DOI：
10.1016/j.fuel.2018.02.037
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发表时间：
2018-05-15
期刊：
影响因子：
7.4
通讯作者：
Andersson, Bengt
中科院分区：
文献类型：
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作者：
Soltani, Soheil;Andersson, Ronnie;Andersson, Bengt
水蒸气对 NO2 非催化碳氧化作用的实验研究表明，其促进作用约为 2 倍。水的促进作用随着温度的降低而增加。类似地，观察到水促进分子氧的碳氧化。此外，当NO2、水和氧气都以气相存在时，观察到协同效应。已发现的证据表明水的促进作用是通过与表面氧复合物的相互作用来实现的。在柴油车的控制单元中实施这项研究的结果将提高过滤器再生的效率。因此，与主动再生循环相关的燃料损失可以最小化。为此，开发了一个全局动力学模型，可以成功地拟合在整个碳转化范围内观察到的反应速率。该模型可用于通过预测所需的排气条件来优化过滤器再生，以保持烟灰积累和燃烧之间的平衡。制定了群体平衡模型，可以跟踪反应器通道或烟灰过滤器中的年龄分布。
Experimental investigation of the effect of water vapor on non-catalyzed carbon oxidation with NO2 has shown a promoting effect of about a factor 2. The promoting effect of water increases with decreasing temperature. Similarly, water was observed to promote carbon oxidation with molecular oxygen. Furthermore, a synergistic effect was observed when NO2, water and oxygen were all present in the gas phase. Evidences have been found suggesting that the promoting effect of water proceeds via an interaction with surface oxygen complexes. Implementing the results of this study in the control unit of diesel vehicles will increase the efficiency of filter regeneration. Therefore, the fuel penalty associated with active regeneration cycles can be minimized. To this end, a global kinetic model was developed that can successfully fit the observed reaction rates over the entire range of carbon conversion. The model can be used to optimize filter regeneration by predicting the required exhaust condition for maintaining a balance between soot accumulation and burn-off. A population balance model was formulated that makes it possible to keep track of age distribution in a reactor channel or in a soot filter.