Electrostatic Charging and Precipitation of Diesel Soot
Electrostatic Charging and Precipitation of Diesel Soot
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静电充电和柴油机烟灰沉淀
DOI：
10.1109/ias.2009.5324852
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
M. Chang
中科院分区：
文献类型：
--
作者：
H. Hayashi;Y. Takasaki;Kazuki Kawahara;T. Takenaka;K. Takashima;A. Mizuno;M. Chang
由新型催化剂技术和颗粒过滤器组成的排气处理系统是满足全球日益严格的颗粒物和氮氧化物（NOX）排放限制法规所必不可少的，这些法规从重型到轻型柴油车。柴油机微粒捕集器（DPF）是降低柴油机微粒排放的关键技术.然而，仍然需要对压降、耐久性和纳米颗粒的收集效率不足进行技术改进。静电除尘器（ESP）是另一种用于废气处理的领先技术，但目前仅限于固定源的应用。在本文中，我们已经证明，同时使用的ESP和DPF显示出协同效应，非常高的收集效率和缓慢的压力降的增加。与单独DPF相比，在组合系统下游观察到的颗粒数浓度减少了98%。同时，确认DPF的压降的增加较慢。本文采用扫描电镜对暴露于废气中的过滤器进行了观察。此外，用抽吸型法拉第笼测量了过滤器表面上带电粒子引起的电位增加。通过该实验可以明确柴油机微粒对DPF的影响。
Exhaust treatment systems consisting of new catalyst technologies and particulate filters are indispensable to meet increasingly stringent global regulations on limits particulate matter and nitrogen oxide (NOX) emissions from heavy-duty to light-duty diesel vehicles. Diesel particulate filter (DPF) has been established as a key technology in reducing diesel particulate emission. However, technological improvements to pressure drop, durability, and insufficient collection efficiency for nanoparticles are still required. Electrostatic precipitator (ESP) is another leading technology used in exhaust treatment, but it is currently limited to applications for stationary sources. In this paper, we have proven that concurrent use of ESP and DPF shows synergetic effects with very high collection efficiency and slower increase of the pressure drop. The number concentration of particles observed downstream of the combined system was 98% less compared with that of DPF only. At the same time, it was confirmed that increase in the pressure drop of DPF was slower. In this paper, the filter that was exposed to exhaust gas was observed by using scanning electron microscope. In addition, potential increase by charged particles on the surface of the filter was measured with a suction-type Faraday cage. The influence of the diesel particulate exerting on DPF by such an experiment was able to be clarified.