Submicron PM removal of an ESP combined with a metallic foam filter for large volumetric diesel engines

An electrostatic diesel particulate matter filtration device has been tested using 4000 cc-diesel engines operating at standard (European Stationary Cycle (ESC) 13 and European Transient Cycle (ETC)) conditions when temperature changed from 100 to 500^oC and gas velocity up to 30 m/s. The device consisted of an electrostatic precipitator(ESP) with edge to cylinder type and a metallic foam filter. To minimize the volume of the foam filter and reduce pressure drop through the filtration device, the thickness of the layer of a foam filter was reduced from 34.5 to 11.5 mm. PM emission of the newly developed filtration device with the thickness of foam sheets of 11.5 mm was less than 0.01 g/kWh which was the diesel PM regulation of EURO 6 for diesel vehicles, while the emission of the foam filter made with 11.5-mm layers was over 0.03 g/kWh. In particular, the pressure drop of the device with 11.5 mm of foam sheets was only 25% of that with 34.5-mm layers, and approximate 12 g of PMs that were burned out at temperature range from 300 to 400 ^oC by natural regeneration in the foam filter coated with Pt catalysts.