DPFにおける粒子捕集メカニズム

概要

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After-treatment systems consisting of new catalyst technologies and particulate filters will be indispensable to meet increasingly stringent global regulations limiting particulate matter (PM) and NO_x emissions from heavy duty and light duty diesel vehicles. Diesel particulate filter (DPF) has been established as a key technology in reducing diesel particulate emission. But particulate filtering characteristics in a DPF have not been fully understood yet. We investigated effects of particle size and particulate load on particle trapping efficiency in a DPF both by flow reactor experiments and computer simulations for the purpose of developing high-performance DPF. In a flesh DPF, the dominant particle trapping mechanism transferred from the Brownian diffusion to the interception at around 200nm in particle diameter, and these particles showed the lowest particle trapping efficiency. Particle size dependency of the particle trapping efficiency disappeared when PM accumulated in a DPF. These results led to availability of DPF for the reduction of diesel nanoparticles.
2006-09-25