PM removal of an electrostatic filtration device combined with a metallic foam filter under high velocity and temperature conditions for large volumetric diesel engines

摘要

An electrostatic diesel particulate matter filtration device has been tested using 4000 cc diesel engines operating at standard (European Stationary Cycle (ESC) 13 mode) conditions when temperature changed from 300 to 500℃ and normal gas flow rate from 2 to 8 m~3/min. The device consisted of an electrostatic precipitator 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 layer of a foam filter was reduced from 20 to 6 layers. PM emission of the newly developed filtration device with 6 layers of foam sheets was 0.011 g/kWh which was much less than PM regulation of EURO 5 (0.02 g/kWh), while the emission of the foam filter made with 20 layers was 0.0235 g/kWh. In particular, the pressure drop of the device with 6 layers of foam sheets was only 20% of that with 20 layers.