壁流式重结晶碳化硅柴油机颗粒过滤器的设计与优化

Design and Optimization of Wall-flow Re-crystallization Silicon Carbide Diesel Particulate Filters

壁流式重结晶碳化硅柴油机颗粒过滤器已经被证明能有效地控制柴油机碳烟颗粒排放物,达到日趋严格的柴油机排放标准。高纯度的碳化硅原材料是生产一致性良好的碳化硅过滤器的必备条件。为了减少壁流式重结晶碳化硅柴油机颗粒过滤器的使用成本,通过对碳化硅载体生产工艺的简化与优化,节省了碳化硅原材料的消耗;通过对非对称孔结构的优化设计,增加了机油灰分的储存能力,从而缩短过滤器的长度;通过对粘合剂厚度的优化,提升了过滤器的性能。数值结果表明,上述优化手段是合理可行的。另外,对粘合剂在高温条件下的进行老化性能试验,XRD结果表明,粘合剂在高温1000℃老化10h后,没有明显的特征峰值。

Wall-flow re-crystallized silicon carbide diesel particulate filters(DPFs)have been proved to be one of the most effective technologies for controlling particulate matters from diesel engines in order to meet the more and more stringent diesel emission regulation.High purity silicon carbide is very crucial for producing consistent diesel particulate filters.The manufacturing process has been simplified and optimized for the sake of saving silicon carbide raw material consum ption,reducing the cost of re-crystallized silicon carbide DPFs.The lube oil ash storage capacity of DPFs is enhanced by the optimized design of asymmetrical cell structure,which could shorten DPF length;DPFs performance is improved by optimizing bond thickness.Simulation results show that the optimization measure is feasible.In addition,the XRD result of aging experiment of cement at 1000℃for 10 hours presents no characteristic peak compared with fresh sample.