CO
A CO 2 recovery device includes an advanced desulfurization-cooling column that removes sulfur oxides in an exhaust gas and reduces a temperature of the exhaust gas; a CO 2 absorption column that removes CO 2 in the exhaust gas by bringing the CO 2 into contact with a CO 2 absorption liquid; and a regeneration column that recovers the CO 2 by causing the CO 2 absorption liquid to release the CO 2 while regenerating the CO 2 absorption liquid, and feeds the regenerated CO 2 absorption liquid to the CO 2 absorption column, where the advanced desulfurization-cooling column includes a circulating line that supplies and circulates a desulfurization-cooling circulation liquid used in order to conduct desulfurization and cooling from a lower part to an upper part of the advanced desulfurization-cooling column, a deep SO x recovery packed bed, and a first cooler that cools the circulation liquid.
1. A CO 2 recovery device comprising:
an advanced desulfurization-cooling column configured to remove sulfur oxides in an exhaust gas and to reduce a temperature of the exhaust gas;
a CO 2 absorption column configured to remove CO 2 in the exhaust gas by bringing the CO 2 into contact with a CO 2 absorption liquid; and
a regeneration column configured to recover the CO 2 by causing the CO 2 absorption liquid to release the CO 2 while regenerating the CO 2 absorption liquid, and to feed the regenerated CO 2 absorption liquid to the CO 2 absorption column,
wherein
the advanced desulfurization-cooling column comprises:
a circulating line configured to supply and circulate a desulfurization-cooling circulation liquid used in order to conduct desulfurization and cooling from a lower part to an upper part of the advanced desulfurization-cooling column,
a deep SO x recovery packed bed located above a connection position between the circulating line and an upper part of the advanced desulfurization-cooling column,
a first demister located above the deep SO x recovery packed bed, and
a first cooler configured to cool the circulation liquid, and
the advanced desulfurization-cooling column directly mixes a liquid flowing down from the deep SO x recovery packed bed with the circulation liquid from the circulating line.
2. The CO 2 recovery device according to claim 1 , wherein the advanced desulfurization-cooling column comprises a dilution water supply line located above the deep SO x recovery packed bed and configured to supply water from outside.
3. The CO 2 recovery device according to claim 1 , wherein the advanced desulfurization-cooling column further comprises a branched circulating line coupled to a portion of the circulating line downstream of the first cooler and configured to supply part of the circulation liquid to a section above the deep SOx recovery packed bed and below the first demister, and wherein the branched circulating line comprises a second cooler configured to cool the part of the circulation liquid.
4. The CO 2 recovery device according to claim 1 , wherein the advanced desulfurization-cooling column comprises a second demister located between a circulation liquid supply position at the upper part of the circulating line and the deep SO x recovery packed bed.
5. The CO 2 recovery device according to claim 2 , wherein the circulating line further comprises an alkaline compound supply line coupled to a portion downstream of a junction with the first cooler.
6. The CO 2 recovery device according to claim 1 , wherein the circulating line further comprises an excess liquid discharge line coupled to a portion upstream of the first cooler.
7. The CO 2 recovery device according to claim 3 , wherein the circulating line further comprises an alkaline compound supply line coupled to a portion downstream of a junction with the branched circulating line.
8. A CO 2 recovery method of applying the CO 2 recovery device according to claim 1 , comprising:
an advanced desulfurization-cooling step of removing the sulfur oxides in the exhaust gas and reducing the temperature of the exhaust gas;
a CO 2 absorbing step of removing the CO 2 in the exhaust gas by bringing the CO 2 into contact with the CO 2 absorption liquid; and
a regeneration step of recovering the CO 2 by causing the CO 2 absorption liquid to release the CO 2 while regenerating the CO 2 absorption liquid, and to feed the regenerated CO 2 absorption liquid to the CO 2 absorption column to reuse the regenerated CO 2 absorption liquid, wherein
the advanced desulfurization-cooling step further includes
a circulating step of supplying and circulating the desulfurization-cooling circulation liquid used in order to conduct the desulfurization and the cooling from the lower part to the upper part of the advanced desulfurization-cooling column, and a mixing step of directly mixing the liquid flowing down from the deep SO x recovery packed bed, which is located above the connection position between the circulating line and the upper part of the advanced desulfurization-cooling column, with the circulation liquid from the circulating line, and
a step of removing and recovering mist of the desulfurization-cooling circulation liquid entrained with the exhaust gas, and accumulating mist at a bottom part of the advanced desulfurization-cooling column, in the first demister.