Air pollution control apparatus and air pollution control method

1. 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.

2. The air pollution control apparatus according to claim 1 , wherein the channel forming unit further includes: a partition including a portion defining an opening formed at a central portion of the stack in a cross-sectional direction in a longitudinal direction and a projection that projects to a tower head of the stack; and a hood-like cover provided to face the partition with a given gap therebetween.

3. An air pollution control method using the air pollution control apparatus according to claim 1 , the method comprising using a density difference between flue gas discharged from the industrial facility and atmosphere flowing in from outside of the stack, the density difference being caused by a temperature difference therebetween, to prevent the flue gas from flowing outside.

4. An air pollution control method using the air pollution control apparatus according to claim 1 , the method comprising mixing flue gas discharged from the industrial facility and atmosphere flowing in from outside of the stack to prevent the atmosphere from flowing further inside of the stack.

5. An air pollution control method using the air pollution control apparatus according to claim 1 to prevent the flue gas from flowing outside of the stack.

6. 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: a first dam provided at an upper portion of a flue gas channel through which the flue gas is fed from the industrial facility to the stack when viewed from a cross-sectional direction in a longitudinal direction of the stack; a second dam provided at a lower portion of an inlet of the stack through which the flue gas is fed to the stack; and a flue gas guiding unit extending from a wall surface of the stack on which the inlet is formed, and including, at a leading end thereof, a projection that projects downward.