CO
A CO 2 recovery device includes: a cooling tower into which an exhaust gas containing carbon dioxide is introduced to cool the exhaust gas; and an absorption tower into which the exhaust gas cooled in the cooling tower is introduced and which brings the exhaust gas into contact with an absorption liquid to remove the carbon dioxide from the exhaust gas, in which the absorption tower has an absorption tower body through which the exhaust gas is flowable and which has a tubular shape, and a demister that is disposed inside the absorption tower body and is configured to remove mist contained in the exhaust gas as the exhaust gas flows therethrough, and the CO 2 recovery device further comprises a flow velocity regulating section that regulates the flow velocity of the exhaust gas flowing through the demister to be within a predetermined range.
1 . A CO 2 recovery device comprising:
a cooling tower into which an exhaust gas containing carbon dioxide is introduced to cool the exhaust gas; and
an absorption tower into which the exhaust gas cooled in the cooling tower is introduced and which brings the exhaust gas into contact with an absorption liquid to remove the carbon dioxide from the exhaust gas, wherein
the absorption tower comprises:
an absorption tower body through which the exhaust gas is flowable and which has a tubular shape; and
a demister that is disposed inside the absorption tower body and is configured to remove mist contained in the exhaust gas as the exhaust gas flows therethrough,
the CO 2 recovery device further comprises a flow velocity regulating section that is configured to regulate a flow velocity of the exhaust gas flowing through the demister to be within a predetermined range, and
the flow velocity regulating section comprises:
a differential pressure acquisition unit that acquires information on a differential pressure between a position upstream of the demister and a position downstream of the demister in a flow direction of the exhaust gas in the absorption tower; and
a control unit configured to control the differential pressure acquired by the differential pressure acquisition unit by controlling the flow velocity such that:
the differential pressure is increased in response to decrease of the differential pressure, and
the differential pressure is decreased in response to increase of the differential pressure.
2 . The CO 2 recovery device according to claim 1 , wherein
the flow velocity regulating section further includes:
an additional supply line configured to supply a fluid to the exhaust gas before being supplied to the absorption tower body, and
a flow rate regulating valve configured to regulate a supply amount of the fluid through the additional supply line,
the differential pressure acquired by the differential pressure acquisition unit is a differential pressure between a pressure of the exhaust gas before being supplied to the demister inside the absorption tower and a pressure of the exhaust gas after passing through the demister inside the absorption tower, and
the control unit controls an opening of the flow rate regulating valve and controls to increase the opening of the flow rate regulating valve in a case in which the differential pressure acquired by the differential pressure acquisition unit is below a specified differential pressure value determined in advance.
3 . The CO 2 recovery device according to claim 2 , wherein the additional supply line supplies the exhaust gas from which the carbon dioxide has been removed in the absorption tower, as the fluid.
4 . The CO 2 recovery device according to claim 2 , wherein the additional supply line supplies outside air as the fluid.
5 . The CO 2 recovery device according to claim 1 , wherein the flow velocity regulating section has an internal regulating portion that is disposed inside the absorption tower body and is configured to regulate a flow rate of the exhaust gas supplied to the demister such that the flow rate falls within a predetermined reference range.
6 . The CO 2 recovery device according to claim 5 , wherein the internal regulating portion is disposed in contact with the demister.