EXHAUST GAS CLEANING APPARATUS BY PLASMA METHOD

摘要

PROBLEM TO BE SOLVED: To surely generate plasma by forming an electrically discharging electrode in a reactor provided in a flue with a metal sheet and a plurality of electrically discharging needles being provided thereon and setting the ratio of the length to the diameter of the electrically discharging needle in a specified range. SOLUTION: This plasma method exhaust gas cleaning apparatus in which exhaust gas from a combustion furnace and exhaust gas from an automobile in a tunnel are objects to be processed is provided with a discharging electrode 13 and a facing electrode 14 and a high electric voltage pulse electric source 12 connected to both electrodes 3 and 14. Then, by continuously applying a high electric voltage pulse between both electrodes 3 and 14, a non-balance plasma is generated to convert toxic gas component in the exhaust gas into an easily collectable form or non-toxic form. In this case, the electrically discharging electrode 13 is constituted of a metal sheet 15 which the same area as that of the facing electrode 14 and a number of electrically discharging needles 16 provided on the metal sheet 15, and the ratio L/D of the length L to the diameter D of the electrically discharging needle 16 is made to be 3-20. Thereby, it is possible to surely generate a stable plasma.