分会场

后处理技术

摘要

The accumulation and distribution of soot particle inside a diesel particulate filter (DPF) affect pressure drop, regeneration efficiency, and the peak temperatures at different positions of the filter during soot loading and regeneration, and thus affecting the performance of the engine upstream and the regeneration frequency and service life of the DPF. It is of great significance to study the soot particle distribution inside the filter and its influencing factors during soot loading for improving the performance and reliability of DPF. A three-dimensional DPF simulation model was developed by using AVL FIRE software to study the effect of four factors on the soot particle distribution along the axial and radial directions in the DPF after the accuracy of the model was verified. In addition, the orthogonal test method was used to determine the weight of influencing factors, such as the expanding angle, the channels per square inch, and the exhaust mass flow rate, on the uniformity of soot particle distribution. The results show that when the soot loading time is 400s, the soot particle inside the filter along the axial direction exhibits a “bowl” shape which is high on both two ends and low in the middle. The uniformity of the axial soot particle distribution decreases significantly with the rise of the channels per square inch, and the uniformity of soot particle distribution along the radial direction reduces evidently with the increase of the expanding angle of the divergent tube. According to the degree of influence on the uniformity of axial soot particle distribution, the three influencing factors in descending order is the channels per square inch, the exhaust mass flow rate, and the expanding angle of the divergent tube.

关键词

diesel particulate filter (DPF); soot distribution; plateau; pressure loss; orthogonal test method

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