US 2007/0163443 A1Published application

System and method for recovering carbon dioxide in exhaust gas

OwnerHideshige Moriyama, Kentaro Matsunaga +1inventors

InventorsHideshige Moriyama, Kentaro Matsunaga, Katsuya Yamashita

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Abstract

An alkaline solution ref lux path which refluxes an alkaline solution being discharged from an alkaline solution discharge port 101 of an absorber 100 to an alkaline solution introduction port 102 to absorb carbon dioxide and the like, and an alkaline solution reflux path which refluxes a regenerated alkaline solution being discharged from a regenerated alkaline solution discharge port 111 of a regenerator 110 to an alkaline solution jet port 112 and discharges the carbon dioxide to regenerate an alkaline solution are disposed separately and independently. Thus, the flow rates and the like of the alkaline solutions flowing through the individual alkaline solution reflux paths can be set individually.

Claims11

Dependent claims

A system for recovering carbon dioxide in an exhaust gas, comprising:

an absorption device which is provided with an exhaust gas introduction port, an alkaline solution introduction port, a remaining exhaust gas discharge port and an alkaline solution discharge port and causes gas-liquid contact between an exhaust gas introduced from the exhaust gas introduction port and an alkaline solution introduced from the alkaline solution introduction port to absorb carbon dioxide contained in the exhaust gas by the alkaline solution;
a regeneration device which is provided with an alkaline solution spurt port, a regenerated alkaline solution discharge port and a carbon dioxide discharge port and discharges carbon dioxide from the alkaline solution having absorbed the carbon dioxide to regenerate the alkaline solution;
a first alkaline solution reflux line which refluxes the alkaline solution being discharged from the alkaline solution discharge port of the absorption device to the alkaline solution introduction port;
a second alkaline solution reflux line which refluxes the regenerated alkaline solution being discharged from the regenerated alkaline solution discharge port of the regeneration device to the alkaline solution spurt port;
and
a storage tank which is comprised of a plurality of split tanks capable of intervening in either the first alkaline solution reflux line or the second alkaline solution reflux line by switching the alkaline solution reflux lines.

3 more elements

A method for recovering carbon dioxide in an exhaust gas, comprising:

a first absorption step which refluxes a first alkaline solution being discharged from an alkaline solution discharge port of an absorption device to an alkaline solution introduction port of the absorption device through a first split tank among a plurality of split tanks configuring a storage tank to cause gas-liquid contact between the exhaust gas and the first alkaline solution to repeatedly absorb carbon dioxide contained in the exhaust gas by the first alkaline solution;
and
a first regeneration step which switches a reflux line of the first alkaline solution to introduce the first alkaline solution having absorbed the carbon dioxide in the first absorption step to an alkaline solution spurt port of a regeneration device, refluxes the first alkaline solution being discharged from a regenerated alkaline solution discharge port of the regeneration device to the alkaline solution spurt port through the first split tank, and discharges repeatedly the carbon dioxide into the regeneration device to regenerate the carbon dioxide absorption capacity of the first alkaline solution.

Dependencies are inferred from the claim text.