US 11,229,873 B2Granted

CO2 recovery device and CO2 recovery method

AssigneeMitsubishi Heavy Industries Engineering, Ltd.

InventorsYosuke Nakagawa, Daisuke Shimada, Tatsuya Tsujiuchi

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Abstract

A CO2 recovery device includes: an absorption tower configured to bring an emission gas including CO2 in contact with an absorbent solution, to remove the CO2 from the emission gas, and to thereby generate a rich solution corresponding to the absorbent solution having absorbed the CO2; a regeneration tower configured to regenerate the absorbent solution by removing the CO2 from the rich solution; a heat exchanger configured to carry out heat exchange between the rich solution and the absorbent solution which is higher in temperature than the rich solution and from which the CO2 is removed; an absorbent-solution delivery pipe configured to deliver the absorbent solution subjected to the heat exchange in the heat exchanger to the absorption tower; and a bypass pipe configured to deliver the rich solution before the heat exchange to the absorbent-solution delivery pipe.

Claims6

Dependent claims

A CO2 recovery device comprising:

an absorption tower configured to bring an emission gas including CO2 in contact with an absorbent solution, to remove the CO2 from the emission gas, and to thereby generate a rich solution corresponding to the absorbent solution having absorbed the CO2;
a regeneration tower configured to regenerate the absorbent solution by removing the CO2 from the rich solution;
a heat exchanger configured to carry out heat exchange between the rich solution and the absorbent solution which is higher in temperature than the rich solution and from which the CO2 is removed;
an absorbent-solution delivery pipe configured to deliver the absorbent solution subjected to the heat exchange in the heat exchanger to the absorption tower;
a bypass pipe configured to deliver the rich solution before the heat exchange to the absorbent-solution delivery pipe;
and
a control device configured to control a bypass control valve attached to the bypass pipe to increase its opening when a liquid level of the absorbent solution accumulated in a base of the regeneration tower is below a predetermined level.

4 more elements

A CO2 recovery method for a CO2 recovery device, comprising:

bringing an emission gas including CO2 in contact with an absorbent solution, removing the CO2 from the emission gas, and thereby generating a rich solution in an absorption tower;
regenerating the absorbent solution by removing the CO2 from the rich solution in a regeneration tower;
carrying out by a heat exchanger a heat exchange between the rich solution and the absorbent solution which is higher in temperature than the rich solution and from which the CO2 is removed;
delivering by an absorbent-solution delivery pipe the absorbent solution subjected to the heat exchange in the heat exchanger to the absorption tower;
delivering the rich solution before the heat exchange to the absorbent-solution delivery pipe through a bypass pipe;
and
controlling a bypass control valve attached to the bypass valve to increase its opening when the liquid level of the absorbent solution accumulated in a base of the regeneration tower is below a predetermined level.

4 more elements

Dependencies are inferred from the claim text.