REMOVAL METHOD OF NITROGEN OXIDE, SUPPLY METHOD OF OZONE GAS, AND OZONE GAS SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a removal method of nitrogen oxide which can continuously supply ozone gas, in which nitrogen oxide is removed, at a stable concentration.SOLUTION: A removal method of nitrogen oxide includes: a process of introducing ozone gas in a first container 51; a process of recovering nitrogen oxide absorption ability of a first absorbent in the first container 51 and introducing the ozone gas in a second container 52; a process of introducing the ozone gas in the first container 51 and suppressing ozone absorption ability of the first absorbent of which the nitrogen oxide absorption ability is recovered while introducing the ozone gas in a third container 52; and a process of introducing the ozone gas in the first container 51, making the first absorbent, of which the nitrogen oxide absorption ability is recovered and the ozone absorption ability is suppressed, absorb the nitrogen oxide, and discharging the ozone gas, of which a concentration of the nitrogen oxide is reduced, from the first container 51.SELECTED DRAWING: Figure 6