Analysis of soot filter regeneration by combined numerical and experimental investigations
通过数值和实验研究相结合的烟灰过滤器再生分析
基本信息
- 批准号:446381321
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:
- 资助国家:德国
- 起止时间:
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
In this project we aim to predict the morphology evolution of a porous solid due to chemical reactions between a solid and a penetrating gas phase. The oxidation of soot by diluted oxygen and NO2, passing through a porous soot layer, will serve as an example of practical relevance. It is well known that the overall oxidation rate during soot filter regeneration is a strong function of time, even under isothermal conditions. By combining experimental investigations and detailed numerical simulations we will try to show from first principles if (and to what extent) the change in the overall reaction rate primarily originates from morphological changes of the soot. Therefor the project aims to separate kinetics on the primary soot particles from morphological changes which affect the accessible surface area in the soot structure.Within the project a special reactor will be constructed that allows to oxidize a soot layer stepwise under isothermal conditions. From analysis of exhaust gas, the integral rate of soot conversion can be monitored. At discrete times the oxidation will be interrupted, and the overall BET surface of the partially oxidized soot layer will be measured without dismounting the sample. Thus, we can simultaneously obtain the effective reaction rates and changes of the overall surface.Detailed information of the porous soot structure has recently become assessable by Focused Ion Beam - Scanning Electron Microscope (FIB-SEM) images. This allows to reconstruct the porous medium in microscopic scale with high resolution and provides initial conditions for direct numerical simulations.A detailed 3D Lattice-Boltzmann (LB) model will be developed to simulate the soot morphology change during soot oxidation. While the transport of a multicomponent gas mixture inside pores will be simulated using the discrete form of the Boltzmann kinetic equation, the heterogeneous soot morphology change during soot oxidation will be modeled as new boundary condition. LB method can handle complex geometries efficiently, thus it is well suited to model solid-gas phase transition.We can calculate the effective oxidation rate and compare it to experimental values, and furthermore, FIB-SEM images obtained from soot samples after partial oxidation can be compared to simulation results.Once a detailed model is available, this will serve as a basis for the development of an extended application-oriented model. For deriving anisotropic macroscopic transport parameters asymptotic homogenization will be used. The derived macroscopic model comprises the classical mass and energy balances as well as balance equations for characteristic structural properties such as BET surface.
在这个项目中,我们的目标是预测多孔固体的形态演变,由于固体和渗透气相之间的化学反应。通过稀释的氧气和NO2,通过多孔烟灰层的烟灰的氧化,将作为一个实际相关的例子。众所周知,即使在等温条件下,烟灰过滤器再生期间的总氧化速率也是时间的强函数。通过结合实验研究和详细的数值模拟,我们将试图从第一原理表明,如果(以及在何种程度上)的变化,在整个反应速率主要源于形态变化的烟尘。因此,该项目旨在将主要烟灰颗粒的动力学与影响烟灰结构中可及表面积的形态变化分开。在该项目中,将建造一个特殊的反应器,允许在等温条件下逐步氧化烟灰层。通过分析废气,可以监测碳烟转化的积分速率。在不连续的时间,氧化将被中断,并且部分氧化的烟炱层的总BET表面将被测量,而不需要测量样品。因此,我们可以同时获得有效的反应速率和变化的整体surface.Detailed信息的多孔烟灰结构最近已成为评估的聚焦离子束扫描电子显微镜(FIB-SEM)图像。这为在微观尺度上重构多孔介质提供了高分辨率的模型,并为直接数值模拟提供了初始条件。建立了详细的三维Lattice-Boltzmann(LB)模型,用于模拟碳烟氧化过程中碳烟形貌的变化。虽然多组分气体混合物在孔隙内的传输将使用离散形式的Boltzmann动力学方程进行模拟,但是在碳烟氧化期间的非均质碳烟形态变化将被建模为新的边界条件。LB方法可以有效地处理复杂的几何形状,因此非常适合模拟固-气相变。我们可以计算有效氧化速率并将其与实验值进行比较,此外,从部分氧化后的烟灰样品获得的FIB-SEM图像可以与模拟结果进行比较。一旦获得详细的模型,这将作为开发面向应用的扩展模型的基础。对于推导各向异性宏观输运参数渐近均匀化将被使用。导出的宏观模型包括经典的质量和能量平衡,以及平衡方程的特征结构性能,如BET表面。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professor Dr.-Ing. Ulrich Nieken其他文献
Professor Dr.-Ing. Ulrich Nieken的其他文献
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{{ truncateString('Professor Dr.-Ing. Ulrich Nieken', 18)}}的其他基金
Yield and selectivity analysis of a bubble flow using the example of toluene oxidation
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256634524 - 财政年份:2014
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Priority Programmes
Simulation der Morphologieausbildung von offenporigen Materialien
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81589419 - 财政年份:2009
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121732584 - 财政年份:2009
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316993420 - 财政年份:
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507026050 - 财政年份:
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