コロナ放電によるディーゼル排ガス中の粒子状物質と窒素酸化物の除去

概要

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In order to remove particulate matter (PM) and nitrogen oxides (NO_χ) contained in diesel exhaust gas, the gas is excited by passing through a corona discharge tubes in a high electric voltage field. A corona discharge collector for PM (CCPM) is designed to collect diesel PM electrically on central electrode and accumulated PM will be removed by a controlled burning (regeneration) process every 15-20 minutes. In a corona discharge reactor for NO_χ removal (CRNR), the NO is oxidized to NO_2, and OH radical generated from H_2O in gas reacts with NO_2, and NO_χ concentration decreases as a result of formation of HNO_3. In this paper, the discharge instability of CCPM by the PM accumulation on electrodes is investigated, and PM collection efficiency>90% is obtained under the condition of 23kV, 0.35mA. As for CRNR, the effect of inlet temperature on the NO_χ reduction rate is discussed experimentally. The NO_χ removal rate of about 95% is observed at an input power of 80 watts. The configuration of a prototype reactor coupled with CCPM and CRNR is proposed in our study.
2000-03-25