柴油机用壁流式过滤体结构参数优化

OPTIMIZATION OF CERAMIC WALL FLOW FILTER

壁流式陶瓷过滤体是柴油机微粒过滤技术中最为关键的部件。根据壁流式过滤体开发的需要,对过滤体结构参数的优化进行研究。根据汽车柴油机排量,将过滤体分为3类,分别对应于2～4 L、6～8 L和10 L以上的柴油机。将不同规格过滤体的最低过滤效率分为3个等级:80％、90％和98％。在此基础上,对过滤体结构参数进行优化。提出一种区域优化与二次优化相结合的优化方法,利用区域优化确定过滤体通道宽度和壁面厚度,利用二次优化确定过滤体孔隙率和微孔径,从而得出不同规格过滤体在不同过滤效率下的优化结构参数范围。

The technology of diesel particulate filter is recognized as one of the most effective purifying technologies of diesel particulate at present, and the ceramic wall flow filter is the most important component of the DPF technology. In order to satisfy the need of the development of ceramic wall flow filter, the optimization study of the configuration parameters of ceramic wall flow filter is conducted. According to the dis- placement of diesel engine, the filters are divided into three kinds of sizes corresponding to 2-4 L, 6-8 L and 10 L or more displacement of the diesel engine respectively, the lowest filter efficiencies of the filter of different sizes are divided into three grades： 80%, 90% and 98%, and the configuration size and the inside parameters of the filter are optimized based on the dividing of the sizes and filter efficiencies. An optimization method combining the method of region optimization with the second optimization is used in the process of filter optimization. The range of the routeway width and the thickness of the filter wall are determined by using the method of region optimization, and the optimization parameters of porosity and pore diameter are determined by using the second optimization. Consequently, the optimization parameter ranges of different size filters are determined under different filter efficiencies.