AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
SO2 and PM Removal Performance of a Packed-Bed Scrubber Combined with Electrostatic Precipitation for Marine Diesel Engines
HAK-JOON KIM, Bangwoo Han, Yong-Jin Kim, Hwang Sung-Chul, Korea Institute of Machinery and Materials
Abstract Number: 227 Working Group: Control Technology
Abstract Wet scrubbers have been used as a SOx and particulate matter (PM) removal method for marine diesel engines. Even though the scrubbers show high removal efficiency against SOx higher than 95%, their PM removal efficiency is relatively very low because PMs from marine diesel engines are ultrafine particles which are hardly removed by droplet and particle collisions. In this study, we combined a cylinder-edge type electrostatic precipitator to a wet scrubber at its inlet to compensate the low efficiency of the scrubber against ultrafine particles. A 3000 cc diesel engine was operated at various speeds and loads, and 0.8%v/v sulphur marine oil was used to generate SO2 and PMs. The flow rate though the scrubber was varied from 3.6 to 7.5 m3/min, and various packing balls made of stainless and plastic (1, 2, 3.5 inch) were used. A SMPS system and photochemical gas analyzer were used to measure concentrations of ultrafine PMs and SO2 gas. Despite of various engine conditions, the SO2 removal efficiency was linearly proportional to L/G. However, the change in size of the packing balls from 1 to 2 inch did not affect on the removal performance. On the other hand, the pressure drop was decreased twice when the packing size was changed from 1 to 2 inch. Finally, we evaluated PM removal efficiency of the standalone wet scrubber and the combined wet scrubber with electrostatic precipitator at the inlet. The PM removal performance with only spraying sea water of 2.5 L/m3 was nearly ineligible because the PMs from the engine even with 0.8%v/v sulphur were mostly ranged at submicrometer range with the mode diameter of approximately 100 nm. However, the combination system with an applied voltage and current of -8 kV/ 0.5 mA removed 100 nm-particles by 80% based on particle number.