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A CO 2 recovery device includes: a CO 2 absorption tower in which CO 2 included in an exhaust gas is absorbed by a CO 2 absorption liquid; and a CO 2 absorption liquid regeneration tower that heats and regenerates the CO 2 absorption liquid that has absorbed CO 2 . The CO 2 absorption liquid regeneration tower includes: a main body part in which the CO 2 absorption liquid is temporarily stored; a boot part provided downward from a tank end of the main body part, having a relatively smaller capacity than the main body part; a flowmeter provided to the boot part, and measuring the liquid surface level of the CO 2 absorption liquid that changes between the main body part and the boot part; and a control device controlling the liquid surface level of the CO 2 absorption liquid between the main body part and the boot part on the basis of the measurement result of the flowmeter.
1. A CO 2 recovery device comprising:
a CO 2 absorption tower in which CO 2 contained in a gas to be treated is absorbed by a CO 2 absorption liquid by bringing the gas to be treated into contact with the CO 2 absorption liquid; and
a CO 2 absorption liquid regeneration tower that heats the CO 2 absorption liquid, which has absorbed CO 2 , to release CO 2 from the CO 2 absorption liquid to regenerate the CO 2 absorption liquid,
wherein the CO 2 absorption liquid regeneration tower includes
a first storage part in which the CO 2 absorption liquid is temporarily stored,
a second storage part that is provided below a bottom part of the first storage part and that has a relatively smaller capacity than the first storage part,
a liquid level measuring device that is provided in the second storage part and that measures a liquid surface level of the CO 2 absorption liquid supplied from the CO 2 absorption liquid regeneration tower to the CO 2 absorption tower, and
a control device that controls the liquid surface level of the CO 2 absorption liquid between the first storage part and the second storage part on the basis of the measurement result of the liquid level measuring device.
2. The CO 2 recovery device according to claim 1 ,
wherein an internal diameter d 2 of the second storage part is relatively smaller than an internal diameter d 1 of the first storage part.
3. The CO 2 recovery device according to claim 1 ,
wherein a ratio (d 2 :d 1 ) of the internal diameter d 2 of the second storage part to the internal diameter d 1 of the first storage part is within a range of 1:10 to 1:2.
4. The CO 2 recovery device according to claim 1 ,
wherein the second storage part is a cylindrical member provided at a bottom part of the CO 2 absorption liquid regeneration tower.
5. The CO 2 recovery device according to claim 1 ,
wherein a liquid flow speed of the CO 2 absorption liquid to be fed from the inside of the second storage part to the CO 2 absorption tower is equal to or lower than 0.3 m/s.