Device for removing volatile organic compounds in air using discharge plasma

摘要

PROBLEM TO BE SOLVED: To crack treating gases under and at the atm. pressure and ordinary temp. and to make the secondary products of discharge non-polluting by arranging needle electrodes in the inlets and outlets of respective capillary discharge tubes so as to face these inlets and outlets and connecting a high-voltage source between these needle electrodes. SOLUTION: The treating gases contg. volatile org. compds. are supplied to the inlet header 11 of a plasma reactor 10. When the gases pass the respective capillary discharge tubes 13, the gases are ionized to plasma by the impulsive DC high voltages impressed between the needle electrodes 15 and 16 and are cracked by ions and the generated ozone. The cracked gas flow to an outlet header 12 and are removed by an active carbon filter device 21. The NOx in the secondary products of the plasma generated in the plasma reactor 10 is removed as well. If there is much carbon monoxide formed by the plasma cracking, CO is converted to CO, by a shift converter 22. If the concn. of particulates, such as dust, is high, the particulates are removed by an air filter 23. As a result, the volatile org. compds. included in the treating gases are easily cracked and removed.