321 コロナ放電によるディーゼル排ガス中のPMとNOxの除去(大気環境保全技術(I))(大気・水保全技術)

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A corona discharge collector for diesel particulate matter (CCPM) is designed to collect diesel particulate matter (PM) electrically on central electrode. Accumulated PM (mainly soot particles) will be removed by a controlled burning (regeneration) process whenever the sparks appeared. In a corona discharge reactor for NOx removal (CRNR), the NO is oxidized to NO_2, and OH radical generated from H_2O in gas reacts with NO_2, and NOx concentration decreases as a result of formation of HNO_3. The configuration of a prototype CCPM and CRNR is proposed in our study, CCPM contains φ54mm reactor with φ0.5mm roll nichrome wire serving as a central electrode. The NOx removal reactor has a stainless wire electrode of φ1.0mm. In this paper, the discharge instability of CCPM by the PM accumulation on electrodes is investigated in a electric voltage field, and PM collection efficiency 60% is obtained under the condition of 2.5kV, 0.1mA〜1.0mA, and the gas flow rate of 14liter/min.
2001-07-09