Patent ID: 8202354

Claim:
An air pollution control apparatus comprising: a stack that discharges flue gas, discharged from an industrial facility, outside; a blower that is provided downstream of the stack and draws in the flue gas; and a CO 2 recovering apparatus that recovers CO 2 in the flue gas drawn in by the blower, wherein the stack includes a controlling unit that suppresses release of the flue gas outside from the stack and suppresses inflow of atmosphere to the stack, and the controlling unit is a channel forming unit that forms a serpentine channel through which the flue gas and the atmosphere in the stack flow, wherein the channel forming unit includes: an upper flue gas guiding unit extending from a wall surface of the stack on a side in which the flue gas flows when viewed from a cross-sectional direction of a longitudinal direction of the stack, and including, at a leading end thereof, a first projection that projects downward; and a lower flue gas guiding unit extending from a wall surface of the stack on a side from which the flue gas is discharged, and including, at a leading end thereof, a second projection that projects upward, and the second projection of the lower flue gas guiding unit is provided between the wall surface of the stack and the first projection of the upper flue gas guiding unit so that a channel for the flue gas is formed in the stack.