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October
26, 2000
Nisshin Steel Co., Ltd. |
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Development of Metallic Diesel
Particulate Filter
(Exhaust Gas Cleaning System) |
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Nisshin Steel Co., Ltd. and Oparts have jointly developed a metallic diesel particulate filter (M-DPF), a system that applies stainless steel foil to clean particulate matter (PM) in black smoke and other exhaust gas from diesel engines. The M-DPF uses a heat-resistant stainless steel foil with high electrical resistance developed by Nisshin Steel and specially treated in a process developed by Oparts. The foil is coiled with a porous electrical insulation membrane into a filter with heating function. Then the filter is corrugated, the peaks and valleys of which are uniformly perforated in the special process that folds over the edges of the perforation to form a burrs so that exhaust gas is diffused through the filter with its flow disrupted, and the PM collides with and is collected by the stainless steel foil and porous insulation membrane, resulting in a significantly reduced amount of PM in the exhaust gas. Moreover, by heating the M-DPF in a short time by sending an electric current directly through the stainless steel foil, the collected PM can be burned off and the filter itself renewed. M-DPF is a simple, vibration-resistant, high-performance system and downsized enough to be fit into diesel-powered vehicles currently in service, thus satisfying the needed DPF functions. Due to its simplicity and compactness to fit into vehicles in service, the M-DPF has garnered attention from the Tokyo Bureau of Environment. M-DPF's Special Characteristics: 1. One filter has both functions : PM collection / burn-off and self-renewal. 2. With PM reduction rate of over 80%, it is as efficient as the ceramic DPF. 3. Vibration resistant, simple, and compact (it is about half the size of a conventional ceramic system), it can be fit into vehicles in service. 4. It can be used with light oil currently in use. 5. An oxidation catalyst may be added (through coating the catalyst on the stainless steel foil), for enhanced burn-off efficiency and removal of unburned particles through oxidation. 6. Can be used not only for PM removal in diesel-powered vehicles, but in a wide range of diesel-powered machinery, including generators and ships as well as the PM removal in factory smoke. |
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