REMOVAL OF TOLUENE FROM AIR BY CORONA DISCHARGE REACTOR AT HIGH TEMPERATURE: INFLUENCE OF ELECTRIC FIELD STRENGTH

抄録

A cylindrical d.c. corona discharge reactor was used to remove toluene from air. Using this reactor, the effect of electric field strength was investigated varying wire-cathode diameters in the elevated temperature which range from room temperature to 400°C. Electron energy depends on wire cathode diameters and gas temperature. When a thicker cathode was used, the required voltage to generate corona discharge increases. This voltage increase causes the higher electron energy. Also, when temperature is elevated, the accompanying gas expansion results in an increase at electron energy because the collision frequency of electron with gas molecules decreases. However, the gas expansion by temperature elevation causes the less resident time of the treated gas in the reactor. The experimental results show that in all temperature range examined here the removal efficiency is higher when the thicker wire-cathode is used at a constant current. When the removal efficiency based on consumed electric energy is considered, this energetic efficiency becomes higher when temperature is elevated.