Exhaust gas treatment method, exhaust gas treatment device, and carbon fiber production system

摘要

One object of the present invention is to provide an exhaust gas treatment method for treating exhaust gases discharged from a carbon fiber manufacturing steps which can suppress a cost increase due to an increase in an amount of an exhaust gas treated, the present invention provides an exhaust gas treatment method including: a first combusting step in which a carbonizing step-exhaust gas discharged from a carbonizing step in which the fibrous substance is carbonized in an inert gas atmosphere is treated; and a second combusting step in which a flameproofing step-exhaust gas discharged from a flameproofing step in which the fibrous substance is flameproofed in an air atmosphere and a first combusting step-exhaust gas discharged from the first combustion step are treated; and an air separating step in which nitrogen for producing the inert gas atmosphere in the carbonizing step, and the oxygen-enriched air used in the first combusting step are produced by separating air.