Apparatus for capturing carbon dioxide

Abstract

The present invention relates to an apparatus for capturing carbon dioxide contained in exhaust gas and, more specifically, provides an apparatus for capturing carbon dioxide, the apparatus comprising: a heater capable of exchanging heat between an absorbent discharged from a regeneration tower, into which the absorbent supplied from an absorption unit is first introduced, and combustion gas discharged from a steam boiler; and a heating boiler capable of heating the absorbent through heat exchange between the absorbent and steam, wherein the heater is provided at a point at which an outlet line, through which the absorbent ultimately discharged after absorbing carbon dioxide in an absorption tower flows, and an outlet line, through which the regenerated absorbent is discharged, intersect, thus making it possible to increase the temperature of the absorbent introduced into the regeneration tower and thereby reduce regeneration energy and increase regeneration efficiency.

Description

carbon dioxide capture device

[0001] The present invention relates to a device for capturing carbon dioxide contained in exhaust gas, and more specifically, to a carbon dioxide capture device capable of reducing regeneration energy and increasing regeneration efficiency by providing a heater capable of heat-exchanging absorbent discharged from a regeneration tower into which absorbent supplied from an absorption unit is first introduced with combustion gas discharged from a steam boiler, a heating boiler capable of heating the absorbent through heat exchange between the absorbent and steam, and a heater provided at a point where an outlet line through which the absorbent finally discharged after absorbing carbon dioxide in the absorption tower flows intersects an outlet line through which the absorbent that has been regenerated is discharged.

[0002] Many technologies, including chemical absorption, adsorption, membrane separation, and deep-freezing, are being developed to reduce carbon dioxide, an acidic gas in exhaust gases. Chemical absorption, which uses an absorbent to absorb and capture carbon dioxide, is the most widely used due to its high efficiency and stable process.

[0003] The conventional carbon dioxide capture system of Fig. 1 includes an absorption tower (91) that removes carbon dioxide from exhaust gas by combining it with an absorbent, a heat exchanger (93) that receives the absorbent that has absorbed carbon dioxide through a pump (P) and performs heat exchange with it, and a regeneration tower (92) that removes carbon dioxide that is chemically bound to the heat-exchanged absorbent. Accordingly, the carbon dioxide absorption and removal device uses the above components to perform a carbon dioxide absorption process and an absorption liquid regeneration process (removal process), and the regenerated absorption liquid is resupplied to the absorption tower (91).

[0004] The exhaust gas flowing into the absorption tower (91) is supplied to the absorption tower (91) at least in part by being extracted from a scrubber used to reduce sulfur oxides. The scrubber is a device that removes sulfur oxides contained in the exhaust gas emitted from engines of ships and the like by spraying cleaning water on the exhaust gas. In the case of ships, seawater is used as the cleaning water. In this way, at least a part of the exhaust gas, in which sulfur oxides have been reduced by seawater, flows into the absorption tower (91). Then, the exhaust gas flowing into the absorption tower is absorbed into the absorbent sprayed there through the following chemical reaction.

[0005] In general, when carbon dioxide is absorbed in an aqueous absorbent solution containing alkanolamine, the reaction equation is as follows.

[0006] Reaction Scheme 1

[0007] CO2(g) ↔ CO2(aq) (1)

[0008] CO2(aq) + 2H2O ↔ HCO3 - + H3O + (2)

[0009] HCO3 - + H2O ↔ CO3 2- + H3O (3)

[0010] Amine + H2O ↔ Amine H + + OH - (4)

[0011] Amine H + + H2O ↔ Amine + H3O + (5)

[0012] Amine + CO2(aq) + H2O ↔ Amine COO - + H3O + (6)

[0013] The absorption reaction described above may vary depending on the type of absorbent used, but in general, the absorption efficiency is best when the ambient temperature is 35 to 45°C, so maintaining this temperature is very important for the carbon dioxide absorption process. However, in the case of ships, seawater is used as the cleaning water for the scrubber, and the temperature of seawater varies greatly, ranging from -2 to 32°C depending on the season and region. Therefore, if such seawater is used as cleaning water in the scrubber of a ship operating in the winter, the exhaust gas discharged from the scrubber becomes supercooled and does not meet the temperature conditions required for the above absorption reaction, which causes the problem of lowering the carbon dioxide absorption efficiency.

[0014] Meanwhile, ships are constantly faced with tight space constraints due to the dense placement of numerous devices within a limited space. Therefore, space optimization is a crucial factor in equipment installed onboard ships. As illustrated in Figure 1, conventional ship-mounted absorption towers, often based on land-based systems, have a cylindrical shape, resulting in poor space efficiency. Therefore, there is a pressing need for technologies that can enhance absorption efficiency while maintaining space efficiency.

[0015] Furthermore, as illustrated in Figure 1, another important technical issue in carbon dioxide capture devices is the regeneration efficiency in the regeneration tower. Unlike absorption towers, regeneration towers separate carbon dioxide from the absorbent and regenerate the absorbent. This regeneration process is an endothermic reaction that requires significant energy. As such, the energy required for absorbent regeneration accounts for a significant portion of the energy required to operate the entire carbon capture system. For this reason, reducing regeneration energy is directly related to the regeneration efficiency of the absorbent. Therefore, the development of technologies that can reduce regeneration energy is required to increase regeneration efficiency.

[0016] (Patent Document 1) Korean Patent Publication No. 10-2013-0002828 (January 8, 2013)

[0017] (Patent Document 2) Korean Patent Publication No. 10-1709867 (February 17, 2017)

[0018] (Patent Document 3) U.S. Patent Publication No. US 9,272,241 (March 1, 2016)

[0019] The present invention has the following objectives in order to solve the problems of the above prior art.

[0020] The purpose of the present invention is to provide a carbon dioxide capture device capable of saving regeneration energy and increasing regeneration efficiency by having a heater capable of exchanging heat between absorbent discharged from a regeneration tower into which absorbent supplied from an absorption unit is first introduced and combustion gas discharged from a steam boiler, and a heating boiler capable of heating the absorbent through heat exchange between the absorbent and steam.

[0021] Another object of the present invention is to provide a carbon dioxide capture device capable of reducing regeneration energy and increasing regeneration efficiency by increasing the temperature of the absorbent flowing into the regeneration tower by providing a heater at a point where the outlet line through which the absorbent finally discharged after absorbing carbon dioxide in the absorption tower intersects the outlet line through which the absorbent after regeneration is discharged.

[0022] Another object of the present invention is to provide a carbon dioxide capture device that can increase the absorption efficiency in an absorption tower by increasing the temperature of the clean water using the waste heat of the gas and increasing the temperature of the exhaust gas flowing into the absorption tower by having a heater capable of exchanging heat between the gas composed of carbon dioxide and water vapor discharged from the regeneration tower and the clean water of the pretreatment unit.

[0023] Another object of the present invention is to provide a carbon dioxide capture device capable of increasing carbon dioxide absorption efficiency in an absorption tower by including a pretreatment unit capable of raising the temperature of exhaust gas to a temperature range required in an absorption tower through heat exchange between exhaust gas extracted at least in part from a scrubber and fresh water used as cooling water for a heater in a regeneration unit.

[0024] Another object of the present invention is to provide a carbon dioxide capture device that is capable of increasing carbon dioxide absorption efficiency in an absorption tower by lowering the temperature of fresh water discharged from a pretreatment unit and sending it to a heater of a regeneration unit by providing a cooler so that it can be used stably not only in winter but also in summer when the temperature of seawater rises, thereby lowering the temperature of fresh water supplied from the heater to the pretreatment unit and preventing it from overheating.

[0025] Another object of the present invention is to provide a carbon dioxide capture device that can increase carbon dioxide absorption efficiency and simultaneously optimize space or increase space efficiency by integrating the pretreatment unit with a scrubber.

[0026] Another object of the present invention is to provide a carbon dioxide capture device having a water treatment unit capable of filtering the clean water sprayed to the pretreatment unit, thereby increasing the replacement cycle of the clean water and preventing damage to the pretreatment unit, heater, pipe, absorbent, etc. due to contamination of the clean water.

[0027] Another object of the present invention is to provide a carbon dioxide capture device having a high absorption capacity compared to the same space occupancy by providing an absorption tower having a hexahedral shape with a flat cross-section and a side cross-section having a square or rectangular shape.

[0028] Another object of the present invention is to provide a carbon dioxide capture device in which at least two absorption towers are arranged in a row so as to be horizontally interconnected, thereby ensuring a high absorption capacity even in a narrow space.

[0029] Another object of the present invention is to provide a carbon dioxide capture device capable of securing a high absorption capacity even in a narrow space by sequentially injecting the regenerated absorbent supplied from the regeneration unit from the absorption tower located at the farthest position from the exhaust gas inlet to the absorption tower closest to the exhaust gas inlet, thereby ensuring that each absorption tower has the most uniform carbon dioxide absorption capacity possible.

[0030] Another object of the present invention is to provide a carbon dioxide capture device that has a post-treatment tower at the rear end of an absorption tower to prevent droplets of an absorbent remaining in exhaust gas discharged to the atmosphere after removal of carbon dioxide from being discharged to the atmosphere.

[0031] Another object of the present invention is to provide a carbon dioxide capture device that has a condensation chamber provided on the upper side of an absorption tower and a post-treatment tower so that droplets of absorbent or clean water that may be generated during a cleaning process in the post-treatment tower can be condensed, thereby preventing the droplets from being emitted into the atmosphere.

[0032] Another object of the present invention is to provide a carbon dioxide capture device capable of increasing the absorption efficiency of carbon dioxide by providing a baffle between at least two absorption towers and allowing the baffles to be mutually connected to each other to induce the exhaust gas to flow in a desired direction.

[0033] Another object of the present invention is to provide a carbon dioxide capture device that can increase the carbon dioxide absorption efficiency by maintaining the absorbent concentration in each absorption tower at a desired level by providing a demister in a communication hole formed in a partition between absorption towers to block the movement of absorbent or vapor droplets to the neighboring absorption tower.

[0034] Another object of the present invention is to provide a carbon dioxide capture device capable of increasing absorption efficiency by opening the lower portion of a partition between an absorption tower furthest from an exhaust gas inlet and a post-treatment tower installed at the rear end of the absorption tower to allow storage space to be shared, thereby maintaining the absorbent concentration at a desired level.

[0035] Another object of the present invention is to provide a carbon dioxide capture device configured to spray clean water from a buffer tank into the lower and upper regions of a post-treatment tower, respectively, and to allow the clean water sprayed into the upper region to return to the buffer tank, but the clean water sprayed into the lower region to not return to the buffer tank but to be supplied to the storage space of an adjacent absorption tower, thereby allowing the concentration of the absorbent to be adjusted to a desired level, thereby continuously maintaining and increasing absorption efficiency.

[0036] Another object of the present invention is to provide a carbon dioxide capture device that has a filter installed in an inlet line through which an absorbent supplied from a regeneration unit flows to remove foreign substances such as salt and dust contained in the absorbent, thereby preventing damage to the structure of the absorbent unit and increasing the absorption efficiency of carbon dioxide.

[0037] Another object of the present invention is to provide a carbon dioxide capture device capable of increasing absorption efficiency by providing a cooler in an inlet line through which regenerated absorbent is supplied to lower the temperature of the absorbent supplied from the regeneration unit, thereby cooling it to a temperature range optimal for the absorption reaction in the absorption tower and then introducing it into the absorption tower.

[0038] Another object of the present invention is to provide a carbon dioxide capture device capable of increasing regeneration efficiency by providing a filter in the outlet line through which the absorbent finally discharged after absorbing carbon dioxide in an absorption tower flows, thereby removing foreign substances such as salt and dust remaining on the absorbent and then introducing the absorbent into a regeneration tower.

[0039] In order to achieve the above-mentioned purpose, the present invention is implemented by an embodiment having the following configuration.

[0040] According to one embodiment of the present invention, a carbon dioxide capture device of the present invention comprises an absorption unit including an absorption tower for absorbing carbon dioxide of at least a portion of exhaust gas discharged from a scrubber, and a regeneration unit for regenerating an absorbent discharged from the absorption unit, wherein the regeneration unit includes a regeneration tower into which the absorbent discharged from the absorption unit is initially introduced, and another regeneration tower into which the absorbent discharged to the regeneration tower is introduced.

[0041] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention is such that the absorbent discharged from the other regeneration tower is supplied to the absorption section, and the carbon dioxide separated from the other regeneration tower is supplied to the regeneration tower into which the absorbent is first introduced, so that the other regeneration tower and the regeneration tower into which the absorbent is first introduced are in fluid communication with each other.

[0042] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention is configured such that the discharge line through which the absorbent discharged from the absorption unit flows to the regeneration tower into which the absorbent discharged from the absorption unit is first introduced is in fluid communication with the other regeneration tower, and the discharge line includes a heater, and the temperature of the absorbent is increased through heat exchange between the combustion gas of the steam boiler and the absorbent.

[0043] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention comprises a stripping region in which the absorbent discharged from the absorption unit is first introduced into the regeneration tower, into which the absorbent discharged from the absorption unit is applied to remove carbon dioxide from the absorbent, and a storage region in which the absorbent from which carbon dioxide has been removed is recovered and stored, and the storage region is in fluid communication with the absorption unit.

[0044] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further includes a heating boiler that is in fluid communication with the storage area and the stripping area, recovers absorbent discharged from the stripping area, reheats it, and supplies the gas containing carbon dioxide to the stripping area and supplies the absorbent back to the storage area, wherein the heating boiler heat-exchanges steam produced by the steam boiler and the absorbent recovered from the stripping area.

[0045] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further includes a blocking means for allowing the flow of gas containing carbon dioxide in the stripping region and the storage region but blocking the flow of the absorbent.

[0046] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention includes one or more chimneys defining a long hole therein through which gas can pass and defining a storage space for storing the absorbent, and the storage space defined by the chimneys is in fluid communication with the heating boiler so that the absorbent collected in the storage space can be introduced into the heating boiler.

[0047] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention is configured such that the regeneration tower and the other regeneration tower are independently connected to each other through a conduit.

[0048] According to another embodiment of the present invention, in the carbon dioxide capture device of the present invention, the regeneration tower and the other regeneration tower are configured as one tower.

[0049] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further includes a blocking means between the regeneration tower and the other regeneration tower, which allows the flow of gas containing carbon dioxide but blocks the flow of the absorbent.

[0050] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention includes one or more chimneys that define a long hole therein through which gas can pass and define a storage space for storing the absorbent, wherein the storage space defined by the chimneys is in fluid communication with a heater so that the absorbent collected in the storage space can flow into the other regeneration tower via the heater.

[0051] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further arranges a heater at a point where an outlet line through which an absorbent discharged from the other regeneration tower and supplied to the absorption unit flows intersects an outlet line through which an absorbent supplied from the absorption unit to the regeneration tower flows, thereby allowing the absorbents on both sides to exchange heat, thereby lowering the temperature of the absorbent discharged from the other regeneration tower and supplied to the absorption unit and conversely raising the temperature of the absorbent supplied from the absorption unit to the regeneration tower.

[0052] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further lowers the temperature of the gas and raises the temperature of the liquid by placing a heater at a point where an outlet line through which a gas containing carbon dioxide discharged from the regeneration tower flows intersects an outlet line through which a liquid discharged from the pretreatment unit flows.

[0053] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further includes a water separator on the gas discharge line to condense water vapor contained in the gas and separate only carbon dioxide.

[0054] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention further includes a pretreatment unit between the scrubber and the absorption unit, and the exhaust gas extracted from the scrubber is introduced into the pretreatment unit, adjusted to a predetermined temperature required in the absorption unit, and then introduced into the absorption unit.

[0055] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention includes a pretreatment tower configured to be connected to an inlet line through which liquid discharged from a heater of the regeneration unit flows in, an inlet line through which exhaust gas partially extracted from the scrubber flows in, an outlet line through which liquid discharged from the pretreatment unit flows out, and an outlet line through which the exhaust gas flows out, and the pretreatment tower heat-exchanges the liquid of the heater of the regeneration unit with the exhaust gas to increase the temperature of the exhaust gas to a predetermined temperature required by the absorption unit.

[0056] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention has a hexahedral shape in which the absorption tower has a cross-section and a side cross-section having any one shape selected from the group consisting of square and rectangular shapes.

[0057] According to another embodiment of the present invention, the carbon dioxide capture device of the present invention comprises at least two absorption towers, and the two or more absorption towers are arranged in a horizontal direction and are connected to each other so that the introduced exhaust gas can flow.

[0058] The present invention has the following effects by the configuration of the above-described embodiment.

[0059] The present invention has the effect of reducing regeneration energy and increasing regeneration efficiency by providing a heater capable of exchanging heat between the absorbent discharged from the regeneration tower into which the absorbent supplied from the absorption unit is first introduced and the combustion gas discharged from the steam boiler, and a heating boiler capable of heating the absorbent through heat exchange between the absorbent and steam.

[0060] The present invention provides a heater at a point where an outlet line through which an absorbent finally discharged after absorbing carbon dioxide in an absorption tower flows intersects an outlet line through which an absorbent that has been regenerated is discharged, thereby increasing the temperature of the absorbent flowing into the regeneration tower, thereby reducing regeneration energy and increasing regeneration efficiency.

[0061] The present invention has an effect of increasing the absorption efficiency in the absorption tower by increasing the temperature of the clean water using the waste heat of the gas and increasing the temperature of the exhaust gas flowing into the absorption tower by providing a heater capable of exchanging heat between the gas composed of carbon dioxide and water vapor discharged from the absorption tower and the clean water of the pretreatment unit.

[0062] The present invention can obtain the effect of increasing the carbon dioxide absorption efficiency in the absorption tower by including a pretreatment unit capable of raising the temperature of the exhaust gas to a temperature range required in the absorption tower through heat exchange between exhaust gas extracted at least in part from the scrubber and fresh water used as cooling water for a heater in a regeneration unit.

[0063] The present invention provides a cooler so that it can be used stably not only in winter but also in summer when the temperature of seawater rises, and lowers the temperature of the fresh water discharged from the pretreatment unit and then sends it to the heater of the regeneration unit, thereby lowering the temperature of the fresh water supplied from the heater to the pretreatment unit and preventing it from overheating, thereby achieving the effect of increasing the carbon dioxide absorption efficiency in the absorption tower.

[0064] The present invention has the effect of increasing carbon dioxide absorption efficiency by integrating the pretreatment unit with the scrubber, while simultaneously seeking space optimization or increasing space efficiency.

[0065] The present invention has a water treatment unit capable of filtering the clean water sprayed to the pretreatment unit, thereby increasing the replacement cycle of the clean water and preventing damage to the pretreatment unit, heater, pipe, absorbent, etc. due to contamination of the clean water.

[0066] The present invention provides an absorption tower having a hexahedral shape with a flat cross-section and a side cross-section having a square or rectangular shape, thereby having the effect of obtaining a high absorption capacity compared to the same space occupancy rate.

[0067] The present invention can achieve the effect of securing high absorption capacity even in a narrow space by arranging at least two absorption towers in a row so as to be mutually connected in the horizontal direction.

[0068] The present invention has the effect of ensuring a high absorption capacity even in a narrow space by sequentially injecting the regenerated absorbent supplied from the regeneration unit from the absorption tower located at the farthest position from the exhaust gas inlet to the absorption tower closest to the exhaust gas inlet, thereby ensuring that each absorption tower has the most uniform carbon dioxide absorption capacity possible.

[0069] The present invention can achieve the effect of preventing droplets of absorbent remaining in exhaust gas discharged to the atmosphere after carbon dioxide removal from being discharged to the atmosphere by providing a post-treatment tower at the rear end of the absorption tower.

[0070] The present invention can obtain the effect of preventing droplets of absorbent or clean water that may be generated during the cleaning process in the post-treatment tower from being discharged into the atmosphere by condensing droplets by placing a condensation chamber on the upper side of the absorption tower and the post-treatment tower.

[0071] The present invention can achieve the effect of increasing the absorption efficiency of carbon dioxide by providing a partition wall between at least two absorption towers and allowing the partition walls to be mutually connected to each other, thereby inducing the exhaust gas to flow in a desired direction.

[0072] The present invention has the effect of increasing the carbon dioxide absorption efficiency by providing a demister in a communication hole formed in a partition between absorption towers to block the movement of absorbent or water vapor droplets to an adjacent absorption tower, thereby maintaining the absorbent concentration in each absorption tower at a desired level.

[0073] The present invention can obtain the effect of increasing absorption efficiency by opening the lower part of the partition between the absorption tower furthest from the exhaust gas inlet and the post-treatment tower installed at the rear end of the absorption tower to allow the storage space to be shared with each other, thereby maintaining the absorbent concentration at a desired level.

[0074] The present invention is configured to spray clean water from a buffer tank into the lower and upper regions of a post-treatment tower, respectively, and the clean water sprayed into the upper region returns to the buffer tank, but the clean water sprayed into the lower region does not return to the buffer tank but is supplied to the storage space of an adjacent absorption tower, thereby allowing the concentration of the absorbent to be adjusted to a desired level, thereby achieving the effect of continuously maintaining and increasing the absorption efficiency.

[0075] The present invention has the effect of preventing damage to the structure of the absorption unit and increasing the absorption efficiency of carbon dioxide by removing foreign substances such as salt and dust contained in the absorbent by providing a filter in the inlet line through which the absorbent supplied from the regeneration unit flows.

[0076] The present invention can obtain the effect of increasing absorption efficiency by providing a cooler in an inlet line through which regenerated absorbent is supplied to lower the temperature of the absorbent supplied from the regeneration unit, thereby cooling it to a temperature range optimal for the absorption reaction in the absorption tower and introducing it into the absorption tower.

[0077] The present invention can achieve the effect of increasing the regeneration efficiency by providing a filter in the discharge line through which the absorbent finally discharged after absorbing carbon dioxide in the absorption tower flows, thereby removing foreign substances such as salt and dust remaining on the absorbent and then introducing the absorbent into the regeneration tower.

[0078] The present invention has the effect of reducing regeneration energy and increasing regeneration efficiency by providing a heater capable of exchanging heat between the absorbent discharged from the regeneration tower into which the absorbent supplied from the absorption unit is first introduced and the combustion gas discharged from the steam boiler, and a heating boiler capable of heating the absorbent through heat exchange between the absorbent and steam.

[0079] The present invention provides a heater at a point where an outlet line through which an absorbent finally discharged after absorbing carbon dioxide in an absorption tower flows intersects an outlet line through which an absorbent that has been regenerated is discharged, thereby increasing the temperature of the absorbent flowing into the regeneration tower, thereby reducing regeneration energy and increasing regeneration efficiency.

[0080] The present invention has an effect of increasing the absorption efficiency in the absorption tower by increasing the temperature of the clean water using the waste heat of the gas and increasing the temperature of the exhaust gas flowing into the absorption tower by providing a heater capable of heat exchange between the gas composed of carbon dioxide and water vapor discharged from the regeneration tower and the clean water of the pretreatment unit.

[0081] Figure 1 is a drawing of a conventional carbon dioxide capture device.

[0082] Figure 2 is a drawing of a carbon dioxide capture device according to one embodiment of the present invention.

[0083] Fig. 3 is a perspective view of a scrubber with the pretreatment unit shown in Fig. 2 added.

[0084] Figure 4 is a drawing of the preprocessing unit shown in Figure 2.

[0085] Figure 5 is a perspective view of the absorption tower shown in Figure 2.

[0086] Figure 6 is a front view of the absorption tower shown in Figure 2.

[0087] Figure 7a is a side view of the absorption tower shown in Figure 2.

[0088] Figure 7b is a plan view of the absorption tower shown in Figure 2.

[0089] Fig. 8a is a drawing of the absorption section shown in Fig. 2.

[0090] Figure 8b is a drawing of the post-processing tower shown in Figure 8a.

[0091] Figure 9 is an enlarged view of the chimney tray shown in Figure 2.

[0092] Fig. 10 is an enlarged view of the condensation chamber shown in Fig. 2.

[0093] Fig. 11 is a drawing of the regeneration unit shown in Fig. 2.

[0094] Figure 12 is a drawing of a regeneration unit of a carbon dioxide capture device according to another embodiment of the present invention.

[0095] FIG. 13 is a drawing of a carbon dioxide capture device comprising a pretreatment unit, one absorption tower, and a regeneration unit according to another embodiment of the present invention.

[0096] FIG. 14 is a drawing of a carbon dioxide capture device comprising a pretreatment unit, one absorption tower, one posttreatment tower, and a regeneration unit according to another embodiment of the present invention.

[0097] FIG. 15 is a drawing of a carbon dioxide capture device comprising a pretreatment unit, three absorption towers, one posttreatment tower, and a regeneration unit according to another embodiment of the present invention.

[0098] FIG. 16 is a drawing of a carbon dioxide capture device comprising two absorption towers, one post-treatment tower, and a regeneration unit according to another embodiment of the present invention.

[0099] FIG. 17 is a drawing of a carbon dioxide capture device comprising three absorption towers, one post-treatment tower, and a regeneration unit according to another embodiment of the present invention.

[0100] FIG. 18 is a drawing of a carbon dioxide capture device comprising four absorption towers, one post-treatment tower, and a regeneration unit according to another embodiment of the present invention.

[0101] FIG. 19 is a drawing of a carbon dioxide capture device comprising two absorption towers and a regeneration unit according to another embodiment of the present invention.

[0102] FIG. 20 is a drawing of a carbon dioxide capture device comprising three absorption towers and a regeneration unit according to another embodiment of the present invention.

[0103] FIG. 21 is a drawing of a carbon dioxide capture device comprising four absorption towers and a regeneration unit according to another embodiment of the present invention.

[0104] The applicant will describe the embodiments described above in detail below with reference to the drawings.

[0105] FIG. 2 is a drawing of a carbon dioxide capture device according to one embodiment of the present invention. Exhaust gas emitted from a ship's engine contains substances that cause environmental pollution, such as sulfur oxides and carbon dioxide. The exhaust gas containing these substances that cause environmental pollution is sent to a sulfur oxide reduction device called a scrubber, and after sulfur oxides are reduced in this device, the exhaust gas is discharged into the atmosphere. However, since carbon dioxide is still contained in the exhaust gas from which sulfur oxides have been reduced, the exhaust gas that has passed through the scrubber is not immediately discharged into the atmosphere, but at least a portion of the exhaust gas is taken out to the side and sent to the carbon dioxide capture device (1) of the present invention, thereby capturing the carbon dioxide contained in the exhaust gas and discharging the exhaust gas from which carbon dioxide has been removed or reduced into the atmosphere.

[0106] Referring to FIG. 2, the carbon dioxide capture device (1) of the present invention includes a pretreatment unit (100) that extracts at least a portion of exhaust gas discharged from a scrubber (10) to the side and raises the temperature therefrom, an absorption unit (200) that sprays an absorbent on the exhaust gas raised in the pretreatment unit (100) to absorb carbon dioxide in the exhaust gas, and a regeneration unit (300) that receives the absorbent that has absorbed carbon dioxide from the absorption unit (200), removes carbon dioxide from the absorbent, and then returns the absorbent to the absorption unit.

[0107] FIG. 3 is a perspective view of a scrubber to which the pretreatment unit illustrated in FIG. 2 is added, and FIG. 4 is a drawing of the pretreatment unit illustrated in FIG. 2. The pretreatment unit (100) includes a pretreatment tower (101) into which at least a portion of the exhaust gas extracted from the side of the scrubber (10) is introduced, an exhaust gas inlet line (102) connected to the pretreatment tower so as to be in fluid communication, an inlet line (111) into which fresh water is introduced, an outflow line (113) into which exhaust gas is discharged, an outflow line (116) into which fresh water is discharged, a water treatment unit (130) for purifying contaminated fresh water, a heat exchanger (120) added to the outflow line (116) of the fresh water, and a blower (115) added to the outflow line (113) of the exhaust gas.

[0108] The above pretreatment tower (101) is a space where at least a portion of the exhaust gas discharged to the side from the scrubber (10) is cleaned with clean water, and has an overall rectangular parallelepiped or cuboid shape. The rectangular parallelepiped or cuboid shape ensures maximum space efficiency in the special environment of a ship where space is limited. For this reason, it is preferable that the scrubber (10) also have a cuboid or cuboid shape like the pretreatment tower. As illustrated in FIG. 3, the scrubber (10) comprises an inlet (11) into which exhaust gas discharged from the engine flows in, a body (14) in which a scrubbing action occurs to reduce sulfur oxides by dispersing a cleaning liquid such as seawater in the introduced exhaust gas, and an outlet (13) through which exhaust gas with reduced sulfur oxides is discharged. In the present invention, a portion of the exhaust gas with reduced sulfur oxides is discharged to the side immediately before it is discharged through the outlet (13) and supplied to the pretreatment tower (101). The above pretreatment tower (101) extracts a portion of the exhaust gas through an inlet line (102) connected to the upper part of the body (14) and the pretreatment tower so as to be in fluid communication with the pretreatment tower. As illustrated in FIG. 3, it is preferable that the pretreatment tower (101) be provided as an integral part with the scrubber while extracting the exhaust gas to the side through the inlet line (102). This integrally provided configuration eliminates the need for installing additional conduits, thereby enabling efficient installation of the pretreatment tower in a narrow space such as a ship, and furthermore, there is an advantage in that it is possible to install a pretreatment tower with an increased size so that more exhaust gas can be extracted and processed in the same space.

[0109] The above pretreatment tower (101) includes an exhaust gas inlet (104), a fresh water inlet (107), a nozzle (103), a packing (105), a storage space (108), a fresh water outlet (110), an exhaust gas outlet (109), and a demister (106).

[0110] The above inlet (104) is connected in fluid communication with the inlet line (102) so that exhaust gas extracted from the scrubber is introduced.

[0111] The above inlet (107) is connected to the inlet line (111) so that the fresh water stored in a predetermined amount in the storage space (108) is returned in a heated state after heat exchange in the heater (330) of the regeneration unit described later.

[0112] The above nozzle (103) is configured to spray fresh water introduced into the inlet (107) and sprays fresh water in the direction of gravity toward the storage space (108).

[0113] The above packing (105) is a laminated body located on the lower side of the nozzle, which allows the sprayed fresh water to adhere to the surface and remain there for a predetermined period of time, thereby increasing the contact time and contact area with the exhaust gas, thereby increasing the temperature of the exhaust gas through heat exchange, and maximizing the removal of foreign substances. The sea water used to reduce sulfur oxides in the scrubber (10) has a low temperature of -2 to 15°C depending on the region in winter, so the exhaust gas discharged from the scrubber in winter is supercooled and discharged at a temperature of approximately 10 to 25°C. However, since this temperature range is lower than the 35 to 45°C required for the absorption reaction of carbon dioxide in the absorption tower, there is a problem that the absorption rate of carbon dioxide in the absorption tower is low in winter. However, as in the present invention, the above problem is solved by allowing the fresh water sprayed from the nozzle to come into contact with the exhaust gas, thereby increasing the temperature of the exhaust gas to a temperature range required for the absorption reaction.

[0114] The above storage space (108) refers to a predetermined space at the bottom of the pretreatment tower and is a space capable of storing falling clean water. A certain amount of clean water is always stored in this space, and the clean water circulates along a closed circuit consisting of an inlet line (111) and an outlet line (116) configured between the pretreatment tower and the heater of the regenerator described later.

[0115] The above outlet (110) is an outlet through which the fresh water stored in the storage space (108) flows out, and is connected to the outlet line (116) in fluid communication so that the fresh water can be supplied to the heater (330).

[0116] The above outlet (109) is an outlet formed between the upper end of the storage space (108) and the lower end of the packing (106), through which the heated exhaust gas is discharged, and is in fluid communication with the outlet line (113) through which the discharged exhaust gas flows. As previously discussed, since the exhaust gas heated to 35 to 45°C is provided to the absorption tower through the outlet line (113), the absorption rate of carbon dioxide in the absorption tower can be increased without a separate heating process.

[0117] The above demister (106) is installed at the outlet (109) and is configured to filter out clean water droplets contained in the exhaust gas, thereby preventing the clean water droplets from being discharged to the outlet (109) and flowing into the absorption unit together with the exhaust gas. Various known demister configurations can be used. As will be described later, the absorption unit may have two or more spatially independent absorption towers, and since the absorbent concentration is set for each absorption tower, when clean water droplets flow into the absorption unit, the absorbent concentration changes, causing a problem of a decrease in the absorption efficiency of carbon dioxide. Therefore, in order to maintain the absorbent concentration set for each absorption tower, it is necessary to block moisture from flowing into the absorption unit.

[0118] The above water treatment unit (130) is configured to be in fluid communication with the storage space (108) in order to remove the exhaust gas flowing into the pretreatment tower, which may contain various foreign substances such as salt and dust. Various known water treatment technologies may be applied to the water treatment unit, but a membrane type is preferably suitable. The water treatment unit (130) introduces clean water through an outlet line (132) in fluid communication with the storage space (108), processes the water, and then discharges the purified clean water to the outlet line (116) through a return line (134) configured to be in fluid communication with the outlet line (116) so that the purified clean water can be supplied to the heater (330), thereby preventing the components such as the outlet line (116) and the heater (330) from being damaged by foreign substances in the clean water. One end of the above return line is directly fluidly connected to the discharge line (116) rather than the storage space (108), which has the advantage of reducing the contamination level of the fresh water on the discharge line (116) compared to the case where it is directly fluidly connected to the storage space (108).

[0119] The above heat exchanger (120) is installed on the fresh water discharge line (116) to cool the temperature of the fresh water flowing into the heater. In winter, there is a problem of the exhaust gas being overcooled by seawater in the scrubber, but in summer, the temperature of the seawater rises to 32°C, so if the temperature is increased in the pretreatment tower, there is a problem of the temperature of the exhaust gas exceeding the absorption reaction temperature range required by the absorption tower, which is 35 to 45°C. Therefore, the fresh water flowing in the discharge line (116) exchanges heat with the seawater supplied through the seawater supply line (118) to adjust the temperature to the seawater temperature range, thereby preventing the exhaust gas supplied to the absorption tower from being overheated.

[0120] The blower (115) is a configuration installed on the exhaust gas discharge line (115) and forcibly sucks the exhaust gas within the pretreatment tower (101) and supplies it to the absorption tower. Due to the forced suction of the blower, the exhaust gas of the scrubber is forcibly introduced into the pretreatment tower (101) through the inlet line (102) and can be introduced into the absorption tower through the discharge line (113) past the packing (105).

[0121] Fig. 5 is a perspective view of the absorption tower illustrated in Fig. 2, Fig. 6 is a front view of the absorption tower illustrated in Fig. 2, Fig. 7a is a side view of the absorption tower illustrated in Fig. 2, and Fig. 7b is a plan view. Fig. 8a is a drawing of the absorption unit illustrated in Fig. 2.

[0122] As shown in Fig. 8a, the absorption unit (200) includes an absorption tower (202) in fluid communication with an exhaust gas discharge line (113) and an absorbent inlet line (260) and an outlet line (270, 272).

[0123] The above absorption tower (202) has a shape and structure that can increase space efficiency in consideration of the characteristics of the ship to which the present invention is applied. The term "space efficiency" as used herein refers to the ratio of the internal volume (volume of the space through which exhaust gas flows) of the absorption tower of a carbon dioxide capture device installed in a ship space of the same volume. Therefore, the higher the ratio of the internal volume of the absorption tower to the same volume, the higher the "space efficiency" it can be said to have. This definition applies equally to the pretreatment tower. The absorption tower (202) has a projection plane (or cross-section) projected onto the ground in the side view of Fig. 7a and a projection plane (or cross-section) projected onto the ground in the plan view of Fig. 7b that is rectangular or square. Therefore, it is possible to secure higher space efficiency than a conventional cylindrical absorption tower, so that more exhaust gas can be extracted from the scrubber and treated, thereby increasing the carbon dioxide absorption efficiency.

[0124] The above absorption tower (202) includes a housing (201) having a hexahedral shape with a rectangular or square projection surface in the side and plane, and the housing defines an absorption space in which an absorbent is injected and carbon dioxide of exhaust gas is absorbed by the absorbent. The above absorption space may be identical to the internal volume of the absorption tower mentioned above, but in the embodiment in which a post-treatment tower is added as described below, the internal volume of the post-treatment tower is excluded. The above absorption tower (202) includes an inlet (202a) through which exhaust gas flows in, and an outlet (202b) through which exhaust gas flows out, and as illustrated in FIGS. 8a and b, the inlet (202a) is connected to be in fluid communication with an exhaust gas flow line (113).

[0125] The above absorption tower (202) may include an absorption tower (205) into which the regenerated absorbent supplied from the regeneration unit is first introduced and an absorption tower (203) having an exhaust gas inlet (202a) formed therein. The absorption tower (203) into which the exhaust gas is first introduced may be referred to as a 'reference absorption tower', and the absorption tower (205) into which the regenerated absorbent supplied from the regeneration unit is first introduced may be referred to as a 'regenerative absorption tower'. The regenerative absorption tower refers to an absorption tower located farthest from the reference absorption tower. For convenience, the present invention describes the reference absorption tower (205) and the regenerative absorption tower (203) as examples, but one or more absorption towers may be additionally included between these absorption towers. Accordingly, one or more absorption towers may be additionally provided between the regenerative absorption tower (205) into which the regenerated absorbent supplied from the regeneration unit is first introduced and the reference absorption tower (203) having the exhaust gas inlet (202a) formed therein. Additionally, in the neighboring absorption tower, the term 'neighboring absorption tower' means an absorption tower that is continuously located to the right or left of a specific absorption tower as illustrated in Fig. 8a.

[0126] As described above, two or more absorption towers (203, 205) are arranged in a transversely continuous manner and are configured to be interconnected so that the exhaust gas inside can flow. Here, 'the absorption towers are interconnected' means that the internal space between the absorption towers is independently divided by a partition wall (209), but the exhaust gas can flow through a communication port (214a, 214b) provided on one side of the partition wall.

[0127] The above-described regenerative absorption tower (205) includes an inlet (205b) in fluid communication with an inlet line (260) through which a regenerated absorbent supplied from the regeneration unit flows, a nozzle (210) for spraying the absorbent supplied into the inlet (205b) in the direction of gravity, a packing (218) for absorbing carbon dioxide by allowing the absorbent sprayed from the nozzle to adhere to a surface and flow down to come into contact with exhaust gas, a storage space (205a) for storing the absorbent that has fallen downwards, and an outlet (205c) in fluid communication with the storage space (205a) and an outlet line (270). The regenerative absorbent supplied from the regeneration unit is first supplied to the regenerative absorption tower (205) in fluid communication with the inlet line (260), and sprayed in the direction of gravity through the nozzle (210), and absorbs carbon dioxide in the exhaust gas while coming into contact with the exhaust gas supplied from the reference absorption tower (203) in the internal space of the regenerative absorption tower. Next, the absorbent that has fallen after capturing carbon dioxide is stored in a storage space (205a) located at the bottom of the regenerative absorption tower (205) and flows out through an outlet (205c) fluidly connected thereto to an outflow line (270) and is supplied to the reference absorption tower (203), which is an adjacent absorption tower. For example, as shown in FIGS. 15, 17, and 20, when another regeneration tower (213) is provided between the regeneration absorption tower (205) and the reference regeneration tower (203), the absorbent that flows out from the regeneration absorption tower is supplied to the neighboring regeneration tower (213) to absorb carbon dioxide and then finally supplied to the reference regeneration tower (203) to absorb carbon dioxide. And, when two regeneration towers (213, 214) are provided as shown in FIGS. 18 and 21, the absorbent discharged from the regeneration absorption tower (205) is supplied to the neighboring regeneration tower (214) to absorb carbon dioxide, and then the discharged absorbent is supplied again to the neighboring regeneration tower (213) to absorb carbon dioxide, and finally the discharged absorbent is supplied to the reference absorption tower (203) to absorb carbon dioxide.As examined above, the exhaust gas flows from the reference absorption tower (203) toward the regenerative absorption tower (205), but the absorbent is first injected from the regenerative absorption tower (205), and the discharged absorbent is supplied to the neighboring absorption towers (213, 214) and finally injected from the reference absorption tower (203), so the injection order of the absorbent is opposite to the flow direction of the exhaust gas. The absorbent that is supplied to the absorption unit after regeneration is complete is in a 'lean' state, so it has the best carbon dioxide absorption capacity, but conversely, the 'rich' absorbent that has absorbed some carbon dioxide has a lower carbon dioxide absorption capacity than the absorbent in a 'lean' state. In addition, the exhaust gas that flows into the reference regeneration tower (203) has the highest carbon dioxide concentration, so it is easily absorbed by the absorbent, whereas the more it flows to the neighboring regeneration tower, the lower the concentration of carbon dioxide in the exhaust gas, and the lower the ability of the absorbent to absorb it. Therefore, since the carbon dioxide concentration of the exhaust gas decreases the most as it goes from the reference absorption tower (203) to the regenerative absorption tower (205), the absorbent in the most 'lean' state is first supplied to the regenerative absorption tower (205) to increase the carbon dioxide absorption capacity, and then the discharged absorbent is supplied to the neighboring absorption tower where the carbon dioxide concentration is higher than that of the regenerative absorption tower. Even if the absorbent is 'richer' than the absorbent in the regenerative absorption tower, it can secure an absorption capacity similar to that of the regenerative absorption tower. Finally, the absorbent supplied to the reference regenerative tower (203) is the most 'rich' absorbent, but since it has the highest carbon dioxide concentration, it can guarantee an absorption capacity similar to that of the other absorption towers. In addition, since the flow velocity of the exhaust gas in the absorption tower slows down as it goes from the reference absorption tower to the regenerative absorption tower, even if the absorbent in the 'lean' state is injected into the reference absorption tower (203), there is carbon dioxide that is not absorbed in the reference absorption tower but moves toward the regenerative absorption tower. This is also one of the reasons for applying the absorbents in the above order.In this way, the overall carbon dioxide absorption capacity can be increased by ensuring a uniform carbon dioxide absorption capacity for each absorption tower.

[0128] The packing (206, 218) mounted in the above absorption tower is configured to allow the injected absorbent to remain there for a certain period of time, and when the absorbent and exhaust gas come into contact, the absorbent absorbs carbon dioxide through the reaction described above.

[0129] As illustrated in Fig. 8a, the absorption towers are spatially separated from each other by the mutual partition walls (209), but are connected to each other by a communication port (214a). The absorption tower (203) is a reference absorption tower into which exhaust gas first flows, and the exhaust gas flowing in through the inlet port (202a) formed at the bottom moves upward and comes into contact with the 'absorbent supplied from the neighboring regeneration tower (205)' sprayed in the direction of gravity through the nozzle (207), thereby removing carbon dioxide, and the absorbent that has absorbed carbon dioxide falls to the storage space (203a) at the bottom and is stored therein, and is supplied to the regeneration unit through an outlet line (272) fluidly connected to the outlet port (203c). In addition, the exhaust gas from which a certain amount of carbon dioxide has been removed flows to the neighboring regeneration tower (205) through the communication port (214a) located at the top.

[0130] According to another embodiment of the present invention, a demister (208) may be provided in the chimney (214a). As described above, the demister (208) filters out absorbent droplets or moisture contained in the exhaust gas or in the internal space of the absorption tower (203) to prevent them from flowing into the neighboring absorption tower. The absorbent is usually in the form of a composition of an amine-based compound and water, and thus, during the absorption reaction process, the absorbent may flow into the neighboring absorption tower in the form of droplets or the water component of the absorbent may be converted into the form of water vapor. In this case, the concentration of the absorbent in the absorption tower or the neighboring absorption tower may change, making it difficult to obtain the desired level of carbon dioxide absorption efficiency. Therefore, the demister prevents liquid droplets generated in each absorption tower from flowing into the neighboring absorption tower, thereby maintaining the absorbent concentration constant and increasing the carbon dioxide absorption efficiency.

[0131] Next, the neighboring absorption tower (205) absorbs carbon dioxide by forming a flow direction between the exhaust gas flowing from the absorption tower (203) and the injected absorbent.

[0132] According to another embodiment of the present invention, the absorption tower (202) may additionally include a post-treatment tower (204) at the rear end of the regenerative absorption tower (205).

[0133] The above post-treatment tower (204) serves to wash and remove absorbent droplets contained in the exhaust gas before directly discharging the exhaust gas after the carbon dioxide absorption process is completed into the atmosphere. It is configured to be connected to the rear end of the regenerative absorption tower (205) in the middle of the absorption tower (202) and is spatially separated by a partition wall (212), and has a communication port (214b) at the lower side thereof, so that the exhaust gas of the regenerative absorption tower (205) can move to the post-treatment tower (204) through the communication port (214b). The communication port (214b) of the above post-treatment tower is formed at the lower side of the partition wall (212), that is, at the upper side of the storage space (205a) and the lower side of the packing (218).

[0134] As illustrated in Fig. 8b, the post-treatment tower (204) comprises a lower region (204b) for replenishing water to maintain the increased absorbent concentration at a certain level as the absorbent concentration increases during the absorption process, and an upper region (204c) for finally washing away the absorbent contained in the exhaust gas. Although there is an optimal absorbent concentration that can efficiently absorb carbon dioxide, as the absorption process progresses, moisture evaporates, increasing the absorbent concentration, which causes a problem in that the carbon dioxide absorption efficiency decreases.

[0135] The above lower region (204b) includes a supplementary water inlet (222a), a packing (220), a nozzle (222), a demister (224), and a storage space (204a).

[0136] The above supplementary water inlet (222a) is in fluid communication with the buffer tank (250) described later through the inlet line (255), and the fresh water from the buffer tank flows in and is sprayed to the lower region through the nozzle (222), thereby lowering the concentration of the absorbent to a certain level. Through this, the concentration of the absorbent is adjusted to an optimal level.

[0137] The above packing (220) is positioned at the lower side of the nozzle and the upper side of the storage space (204a), and as the clean water sprayed from the nozzle (222a) flows down, it increases the residence time and contact area for the exhaust gas, thereby washing away the absorbent contained in the exhaust gas to a certain level.

[0138] The above storage space (204a) is a space located at the very bottom of the post-treatment tower, where the absorbent is stored, and is fluidly connected to the storage space (205a) of the neighboring regeneration absorption tower (205) through a communication port (216) in which a portion of the lower part of the bulkhead (212) is open.

[0139] In addition, the lower surface (217) of the storage space (204a) is inclined toward the storage space (205a) of the regeneration absorption tower (205), so that the clear water in the storage space (204a) of the post-treatment tower (204) can move to the storage space (205a) of the regeneration absorption tower (205), thereby allowing the diluted absorbent to move to the neighboring absorption tower or the reference absorption tower through the absorbent outlet line (270) of the regeneration absorption tower. Since the absorbent concentration is previously supplied to the reference absorption tower in a state in which it is adjusted to a desired level, carbon dioxide can be efficiently absorbed in the reference absorption tower.

[0140] The above demister (224) filters out droplets or water vapor of fresh water or absorbent contained in the exhaust gas exiting the lower region (204b) so that only the exhaust gas from which these have been removed moves to the upper region (204c), and various known technologies are used.

[0141] The upper region (204c) is a region that finally removes the absorbent contained in the exhaust gas flowing in from the lower region, and includes a blocking means (230), packing (226), nozzle (227), and demister (228).

[0142] An example of the blocking means (230) is a chimney tray illustrated in FIG. 9. Referring to FIG. 9, the blocking means (230) is configured to prevent fresh water sprayed from an upper region from falling to a lower region, and includes a through hole (236), a bottom (235), a long hole (232), and a chimney (231).

[0143] The above floor (235) is provided across the cross-section of the post-treatment tower (204) to block the fresh water falling from the upper region from flowing into the lower region, and the above through holes (236) are formed in multiple numbers on the floor (235) and are holes made in the floor (235) to allow the exhaust gas from the lower region to flow into the upper region. The above chimney (231) is a wall formed vertically along the edge of the above through hole (236) and has a chimney shape, and defines a long hole (232) through which the exhaust gas can flow and a storage space (234) for receiving the falling fresh water. All the fresh water collected in the storage space (234) is collected in the collection well (233). In addition to the above configuration, various known chimney trays can be applied.

[0144] Referring to FIG. 8a, the packing (226) is located on the upper side of the blocking means and allows the falling fresh water to be attached and remain there for a certain period of time so that it can come into contact with the rising exhaust gas, thereby allowing the absorbent or its droplets contained in the exhaust gas to be washed away by the fresh water.

[0145] The above nozzle (227) is located on the upper side of the packing and is configured to spray fresh water supplied from a buffer tank described later, and the demister (228) filters out fresh water or absorbent droplets contained in the exhaust gas exiting the upper region (204c) so that only the exhaust gas from which these droplets have been removed is discharged, and various known technologies are used.

[0146] According to another embodiment of the present invention, the absorption tower (202) of the present invention may additionally include a condensation chamber (240).

[0147] The above condensation chamber (240) is formed to cross the entire absorption tower in a horizontal direction while communicating with the post-treatment tower (204). According to FIGS. 8A and 10, the condensation chamber (240) is formed like a long tunnel in the longitudinal direction while crossing the reference absorption tower, the regenerative absorption tower, and the post-treatment tower from the top of the absorption tower, thereby securing a time for the exhaust gas to remain in this tunnel, thereby condensing the moisture contained in the exhaust gas, and discharging only the exhaust gas from which the moisture has been removed into the atmosphere, and the condensed moisture (hereinafter referred to as “condensate”) is recovered in a buffer tank (250) described below. In addition, the absorbent component that may remain in the exhaust gas can also be recovered.

[0148] The above condensation chamber (240) is defined by an upper surface (244), both side surfaces (243), and a lower surface (241). The upper surface (240) and both side surfaces (243) are all part of the housing (201) of the absorption tower, and the lower surface (241) is a part that constitutes the upper surface of the reference absorption tower (203) and the regenerative absorption tower (205). Therefore, an internal space (245) surrounded by these upper surface, lower surface, and both side surfaces is defined, and condensation occurs as the movement speed of the exhaust gas in the internal space (245) slows down and the residence time increases.

[0149] In addition, the above-described lower surface (241) may additionally include an inclined surface (241a) on one side thereof. The inclined surface (241a) is a surface in which a portion of the lower surface is inclined and is connected to a buffer tank (250) described later through a recovery line (258), so that condensate can flow down and be easily collected in the buffer tank.

[0150] The above condensation chamber (240) is configured to be in communication with the outlet (202b) of the absorption tower (202) and may additionally include a demister (242) on the outlet (202b). The demister (242), like other demisters described above, filters out droplets.

[0151] According to another embodiment of the present invention, the absorption unit of the carbon dioxide capture device (1) of the present invention may additionally include a buffer tank (250).

[0152] As shown in FIG. 8a, the buffer tank (250) is a tank for storing fresh water, and is in fluid communication with the lower region (204b) through an inlet line (255), in fluid communication with the upper region (204c) through an inlet line (253), in fluid communication with the condensation chamber (240) through a recovery line (258), in fluid communication with the collection well (233) of the upper region (204c) through a recovery line (256), and in fluid communication with the upper region through an outflow line (254).

[0153] The fresh water of the buffer tank (250) is supplied to the lower region (204b) through the inflow line (255) fluidly connected to the outlet line (252) of the buffer tank, thereby adjusting the concentration of the absorbent to a certain level. In addition, the fresh water of the buffer tank is supplied to the upper region (204c) through the inflow line (253) fluidly connected to the outlet line (252) of the buffer tank, thereby washing the exhaust gas and recovering the absorbent. In addition, the fresh water applied to the upper region is collected in the collection well (233) of the blocking means (230) and returns to the buffer tank (250) through the recovery line (256) fluidly connected to the collection well. By discharging the gas (air, water vapor) that has risen in the buffer tank to the upper region through the outflow line (254) fluidly connecting the upper end of the buffer tank and the upper side of the blocking means (230), the recovery of the fresh water through the recovery line (256) is facilitated. Additionally, the buffer tank is fluidly connected to the condensation chamber (240) through a return line (258), so that the condensate is returned to the buffer tank.

[0154] As illustrated in FIG. 8A, according to another embodiment of the present invention, the absorption unit (200) may additionally include a filter (264) on the inlet line (260) through which the regenerated absorbent flows. The filter (264) filters out foreign substances such as salts contained in the absorbent supplied from the regeneration unit, thereby preventing the configuration of the absorption unit from being contaminated by foreign substances.

[0155] As illustrated in FIG. 8a, according to another embodiment of the present invention, the absorption unit (200) may additionally include a cooler (262) on the inlet line (260). The cooler (260) cools the temperature of the absorbent supplied from the regenerator to a temperature suitable for the absorption reaction, thereby increasing the absorption efficiency of carbon dioxide.

[0156] As illustrated in FIG. 8A, according to another embodiment of the present invention, the absorption unit (200) may additionally include a filter (274) on the outlet line (272) through which the 'rich' state absorbent discharged from the basic regeneration tower (203) flows. By removing foreign substances such as salts contained in the absorbent through the filter and then delivering the absorbent to the regeneration unit, the regeneration unit can be prevented from being contaminated or damaged by the foreign substances.

[0157] Fig. 11 is a drawing of the regeneration unit illustrated in Fig. 2. The regeneration unit (300) will be described with reference to Fig. 11.

[0158] The above regeneration unit (300) includes a regeneration tower (301) into which the absorbent flowing from the absorption unit is first introduced, and an adjacent regeneration tower (340) that receives the absorbent regenerated from the regeneration tower (301) and regenerates it again.

[0159] The regeneration tower (340) adjacent to the above-mentioned regeneration tower (301) may be provided as a single tower as illustrated in FIG. 12, or as two independent towers as illustrated in FIG. 11. FIG. 11, which is provided as an independent tower, will be described first.

[0160] The above regeneration tower (301) includes a housing (303) defining an internal space (305) where regeneration takes place, and the internal space (305) is provided with a storage space (304), a primary packing (307), a nozzle (309), a secondary packing (311), and a demister (313) from bottom to top. As will be described later, unlike the absorption process, the regeneration process is an endothermic reaction, so a considerable amount of regeneration energy is required. Before the absorbent is introduced into the regeneration tower (301), it is heated to about 120°C through heat exchange in a heater (310) and then introduced into the regeneration tower, so that the temperature of the internal space is maintained at a high temperature of about 120°C while carbon dioxide is removed from the absorbent.

[0161] The above nozzle (309) is located on the upper side of the packing and sprays a ‘rich’ absorbent.

[0162] The above primary packing (307) is located below the nozzle (309) and allows the falling absorbent to be attached and remain there for a certain period of time, thereby enabling efficient removal of carbon dioxide from the absorbent. Due to the high temperature of the absorbent, the primary packing also maintains a similar temperature, facilitating the removal reaction.

[0163] The above secondary packing (311) is located above the nozzle (309) and allows absorbent droplets or water vapor rising together with the removed carbon dioxide to attach and remain there for a certain period of time, thereby removing the carbon dioxide once again. Then, the liquid component falls downward.

[0164] The above demister (313) filters out water vapor and absorbent droplets from the gases such as carbon dioxide and water vapor being emitted, so that only the gases from which these have been removed are emitted, and various known technologies are used.

[0165] The above storage space (304) is a space formed at the bottom of the housing (303) and is a space where the regenerated absorbent that has undergone the first carbon dioxide removal process is stored, and is fluidly connected to the neighboring regeneration tower (340) through the outlet line (392), so that the absorbent therein is supplied to the neighboring regeneration tower (340).

[0166] The above-mentioned neighboring regeneration tower (340) receives the absorbent supplied from the regeneration tower (301) through the outlet line (392) and sprays it from the upper side to remove carbon dioxide from the absorbent.

[0167] As illustrated in Fig. 11, the regeneration tower (340) is composed of a stripping area (340a) for regenerating the supplied absorbent and a storage area (340b) for recovering and storing the regenerated absorbent.

[0168] The above-mentioned removal area (340a) includes a blocking means (350), a primary packing (347), a secondary packing (348), and a nozzle (346).

[0169] The above nozzle (346) is configured to inject the absorbent supplied through the outlet line (392). As will be described later, since a considerable amount of regeneration energy is consumed in the process of removing carbon dioxide in the regeneration tower (301), the absorbent stored in the storage area (304) of the regeneration tower (301) is at a somewhat lower temperature (approximately 105-110°C), a heater (380) is placed on the outlet line to raise the temperature to approximately 120°C.

[0170] The above-mentioned first packing (347) and second packing (348) are located below the nozzle (346) and allow the falling absorbent to be attached and remain there for a certain period of time, thereby enabling efficient removal of carbon dioxide from the absorbent. Due to the high temperature of the absorbent, the packings also maintain a similar temperature, facilitating the removal reaction.

[0171] The above-described blocking means (350) has the same structure as the chimney tray of the absorption tower described above, and thus a detailed description thereof will be omitted. Although the absorbent collected in the blocking means is absorbent that has undergone a degree of regeneration, the absorbent collected in the blocking means is sent to the heating boiler (360) to undergo the regeneration process once again, which will be described later.

[0172] And, gases such as carbon dioxide and water vapor separated in the stripping area are supplied to the regeneration tower (301) through a flow line (335) in which one end is fluidly connected to the upper side of the stripping area (340a) and the other end is fluidly connected to the lower side of the regeneration tower (301), and are stripped once again and flow upward.

[0173] The above storage area (340b) is configured to allow the flow of carbon dioxide but prevent the absorbent of the stripping area from directly flowing in, unlike the stripping area (340a), and includes a storage space (344) for storing the absorbent supplied from the heating boiler (360).

[0174] The absorbent stored in the above storage area (340b) is in the most 'lean' state because it has been regenerated and is fluidly connected to the absorption unit, i.e., the reference absorption tower, through the outlet line (390). The outlet line (390) is merely a name given for the convenience of explanation from the perspective of the regeneration tower, as shown in FIG. 8a, and is a flow path through which the same absorbent flows.

[0175] According to another embodiment of the present invention, the regeneration unit (300) may additionally include a heater (380) and a heating boiler (360).

[0176] For various purposes, a ship is equipped with a steam boiler (370) that produces steam. The present invention supplies steam generated by such a steam boiler to a heating boiler (360), and uses the heat energy of the steam to heat an absorbent recovered by the heating boiler to remove carbon dioxide, and supplies combustion gas discharged from the steam boiler (370) to a heater (380) to exchange heat with the absorbent passing through the heater, thereby increasing the temperature of the absorbent.

[0177] The above heater (380) is a heat exchanger installed at the point where the outlet line (376) through which the combustion gas of the steam boiler (370) is discharged and the outlet line (392) through which the regenerated absorbent discharged from the regeneration tower (301) flows intersect. By heat-exchanging the combustion gas of the steam boiler (370) with the absorbent, which has high thermal energy, the temperature of the absorbent is increased to a temperature required for the stripping reaction in the adjacent regeneration tower. Since the temperature of the absorbent is increased using the thermal energy of the combustion gas of the steam boiler (370) commonly used on ships, no additional regeneration energy is required, thereby improving energy efficiency.

[0178] In addition, the heating boiler (360) receives high-temperature steam produced in the steam boiler (370) through the inlet line (372), recovers the absorbent in the stripping area (340a) through the recovery line (364), exchanges heat with the steam, and removes carbon dioxide from the absorbent once again. The steam used for the heat exchange is returned to the ship's steam boiler (370) system through the discharge line (374).

[0179] The above heating boiler (360) provides gases such as carbon dioxide and water vapor that have been removed to the removal area (340a) through an outlet line (362) that is fluidly connected to the removal area (340a) on the upper side, and provides the absorbent from which carbon dioxide has been removed to the storage area (340b) through an outlet line (366) that is fluidly connected to the storage area (340b). Therefore, the absorbent stored in the storage area is the absorbent in the most 'lean' state after regeneration.

[0180] According to another embodiment of the present invention, the regeneration unit (300) may additionally include a heater (310). The heater (310) is a heat exchanger provided at a point where an outlet line (390) fluidly connected to a storage space (344) of the regeneration tower (340) and an outlet line (272) fluidly connected to a storage space (203a) of the reference absorption tower of the absorption unit intersect. The temperature of the absorbent discharged from the regeneration tower (340) is very high, approximately 120°C, whereas the temperature of the absorbent delivered from the absorption unit is approximately 35-40°C. The heater (310) heat-exchanges these two fluids, thereby raising the temperature of the absorbent to a temperature range required for removing carbon dioxide in the regeneration tower.

[0181] According to another embodiment of the present invention, the regeneration unit (300) may additionally include a heater (330) and a water separator (320).

[0182] The above heater (330) is a heater that is placed at the point where the outlet line (315), which has one end fluidly connected to the top of the regeneration tower (301) and the other end fluidly connected to the technology separator, and the outlet line (116) and inlet line (111) of the clean water of the pretreatment unit (100) intersect. The gas of the outlet line (315) is the removed carbon dioxide and water vapor, and the temperature is very high, approximately 90°C, whereas the clean water is very low, approximately -2 to 15°C in winter. Therefore, by heat-exchanging the gas of the high-temperature outlet line (315) and the low-temperature clean water, the temperature of the cleaning is increased and supplied back to the pretreatment tower (101), so that the temperature of the exhaust gas in the pretreatment unit can be increased to the temperature range required for the absorption reaction by utilizing the wasted energy without providing separate energy, thereby increasing the absorption efficiency in the absorption unit. On the other hand, the water vapor in the gas containing carbon dioxide and water vapor discharged from the top of the regeneration tower (301) is condensed through heat exchange and flows into the lower steam separator. For this reason, when viewed from the side of the regeneration tower, the upper heater may be referred to as a condenser.

[0183] The above-mentioned steam separator (320) separates the condensate condensed from the steam from carbon dioxide so that the carbon dioxide can be transferred to a post-processing process such as a liquefaction process, and the condensate is re-introduced into the regeneration tower (301) through the outlet line (322) for processing.

[0184] Fig. 12 is a drawing of a regeneration unit of a carbon dioxide capture device according to another embodiment of the present invention. The regeneration unit (400) illustrated in Fig. 12 differs from the regeneration unit illustrated in Fig. 11, which comprises two regeneration towers connected by a flow line (335), in that it is configured as a single tower. Since the first digit of the drawing reference numeral is changed to '4' for identical configurations, it should be understood that configurations with the same last digit number perform the same function.

[0185] The regeneration tower (301) and the neighboring regeneration tower (340) of Fig. 11 have the same configuration as the regeneration tower (440) and the neighboring regeneration tower (401) of Fig. 12.

[0186] Referring to Fig. 12, the absorbent in a 'rich' state that has absorbed carbon dioxide is introduced into the upper regeneration tower (401) through the upper regeneration tower (401) which is fluidly connected to the outlet line (272) of the absorption unit.

[0187] The upper regeneration tower (401) includes a housing (403) defining an internal space (405) where regeneration takes place, and the internal space (405) includes a storage space (404), a primary packing (407), a nozzle (409), and a secondary packing (411) from bottom to top.

[0188] The above nozzle (409) is located on the upper side of the packing and sprays a ‘rich’ absorbent.

[0189] The above primary packing (407) is located below the nozzle (409) and allows the falling absorbent to be attached and remain there for a certain period of time, thereby enabling efficient removal of carbon dioxide from the absorbent. Due to the high temperature of the absorbent, the primary packing also maintains a similar temperature, facilitating the removal reaction.

[0190] The above secondary packing (411) is located above the nozzle (409) and allows absorbent droplets or water vapor rising together with the removed carbon dioxide to attach and remain there for a certain period of time, thereby removing the carbon dioxide once again. Then, the liquid component falls downward.

[0191] The storage space (404) is a space formed at the lower part of the housing (403) and is a space where the regenerated absorbent, which has undergone the first carbon dioxide removal process, is stored, and is fluidly connected to the lower regeneration tower (440) through the outlet line (492), so that the absorbent therein is supplied to the lower regeneration tower (440). Unlike the embodiment of FIG. 11, this embodiment includes a blocking means (404a) that blocks the absorbent stored in the storage space (404) from flowing into the lower absorption tower (440). The blocking means (404a) is configured to have the same structure as the chimney tray described above. In addition, this embodiment additionally includes a buffer tank (404b). The buffer tank (404b) recovers the absorbent stored in the storage space through a recovery line (404c) that has one end fluidly connected to the storage space (404) and the other end fluidly connected to the buffer tank (404b). In addition, the buffer tank (404b) performs regeneration by supplying the absorbent to the stripping area (440a) through an outflow line (492) which has one end fluidly connected to the buffer tank and the other end fluidly connected to the stripping area (440a) of the lower regeneration tower (440). In addition, the buffer tank (404b) can discharge carbon dioxide or water vapor, etc., to the regeneration tower (401) through an outflow line (404d) which has one end fluidly connected to the buffer tank and the other end fluidly connected to the upper side of the storage space (404) of the upper regeneration tower (401).

[0192] The above lower regeneration tower (440) receives the absorbent supplied from the above regeneration tower (401) through the outlet line (492) and sprays it from the upper side to remove carbon dioxide from the absorbent.

[0193] As illustrated in Fig. 12, the regeneration tower (440) is composed of a stripping area (440a) for regenerating the supplied absorbent and a storage area (440b) for recovering and storing the regenerated absorbent.

[0194] The above-mentioned removal area (440a) includes a blocking means (450), a primary packing (447), a secondary packing (448), and a nozzle (446).

[0195] The above nozzle (446) is configured to inject the absorbent supplied through the outlet line (492). As will be described later, since a considerable amount of regeneration energy is consumed in the process of removing carbon dioxide in the regeneration tower (401), the absorbent stored in the storage area (404) of the regeneration tower (401) is at a somewhat lower temperature (approximately 105-110°C), a heater (480) is placed on the outlet line (492) to raise the temperature to approximately 120°C.

[0196] The above-mentioned first packing (447) and second packing (448) are located below the nozzle (446) and allow the falling absorbent to be attached and remain there for a certain period of time, thereby enabling efficient removal of carbon dioxide from the absorbent. Due to the high temperature of the absorbent, the packings also maintain a similar temperature, facilitating the removal reaction.

[0197] The above-described blocking means (450) has the same structure as the chimney tray of the absorption tower described above, and thus a detailed description thereof will be omitted. Although the absorbent collected in the blocking means is an absorbent that has undergone a degree of regeneration, the absorbent collected in the blocking means is sent to the heating boiler (460) to undergo the regeneration process once again, which will be described later.

[0198] And, gases such as carbon dioxide and water vapor separated in the stripping area are supplied to the upper regeneration tower (401) through the blocking means (404a) and are stripped once again to flow upward.

[0199] The above storage area (440b) is configured to allow the flow of carbon dioxide but prevent the absorbent of the stripping area from directly flowing in, unlike the stripping area (440a), and includes a storage space (444) for storing the absorbent supplied from the heating boiler (460).

[0200] The absorbent stored in the above storage area (440b) is in the most 'lean' state because it has been regenerated and is fluidly connected to the absorption unit, i.e., the reference absorption tower, through the outlet line (390).

[0201] The above heater (480), heating boiler (460), and steam boiler (470) are identical in configuration to the embodiment illustrated in FIG. 11, so their description is omitted.

[0202] Figures 13 to 21 are schematic layout diagrams of other embodiments of the present invention, each combining a preprocessing unit, an absorption unit, and a regeneration unit in various ways. While only a schematic layout is shown, it still incorporates the previously discussed configuration.

[0203] Figure 13 shows a carbon dioxide capture device comprising a pretreatment unit (101), one absorption tower (202), and a regeneration unit (300). Accordingly, exhaust gas discharged from the pretreatment unit absorbs carbon dioxide in one absorption tower (202) and is then discharged into the atmosphere, and the absorbent that has absorbed carbon dioxide is supplied to the regeneration unit, undergoes a carbon dioxide removal process, and then flows back into the absorption unit.

[0204] According to another embodiment of the present invention, as illustrated in FIG. 14, a carbon dioxide capture device may be configured by comprising a pretreatment unit (101), one absorption tower (202), one posttreatment tower (204), and a regeneration unit. This carbon dioxide capture device introduces exhaust gas that has passed through the pretreatment unit into one absorption tower to remove carbon dioxide, then removes droplets or moisture from the absorbent in one posttreatment tower, sends the absorbent to the regeneration unit to be regenerated, and then introduces it back into the absorption tower.

[0205] According to another embodiment of the present invention, as illustrated in FIG. 15, a carbon dioxide capture device may be configured with a pretreatment unit, three absorption towers (203, 213, 205), one posttreatment tower (204), and a regeneration unit (300). The exhaust gas discharged from the pretreatment unit flows in the order of the reference absorption tower (203), the absorption tower (213), and the regeneration absorption tower (205), and the absorbent supplied from the regeneration unit is provided in the order of the regeneration absorption tower (205), the intermediate absorption tower (213), and the reference absorption tower (203).

[0206] According to another embodiment of the present invention, as illustrated in FIG. 16, a carbon dioxide capture device may be provided comprising two absorption towers (203, 205), one post-treatment tower (204), and a regeneration unit (300).

[0207] According to another embodiment of the present invention, as illustrated in FIG. 17, a carbon dioxide capture device may be configured to include three absorption towers (203, 213, 205), one post-treatment tower (204), and a regeneration unit (300).

[0208] According to another embodiment of the present invention, as illustrated in FIG. 18, a carbon dioxide capture device may be configured to include four absorption towers (203, 214, 213, 205), one post-treatment tower (204), and a regeneration unit (300). The exhaust gas flows in the order of the reference absorption tower (203), the absorption tower (214), the absorption tower (213), and the regeneration absorption tower (205), and the absorbent supplied from the regeneration unit is provided in the order of the regeneration absorption tower (205), the absorption tower (213), the absorption tower (214), and the reference absorption tower (203).

[0209] According to another embodiment of the present invention, as illustrated in FIG. 19, a carbon dioxide capture device may be configured to include two absorption towers (203, 205) and a regeneration unit (300).

[0210] According to another embodiment of the present invention, as illustrated in FIG. 20, a carbon dioxide capture device may be configured to include three absorption towers (203, 213, 205) and a regeneration unit (300).

[0211] According to another embodiment of the present invention, as illustrated in FIG. 21, a carbon dioxide capture device may be configured to include four absorption towers (203, 214, 213, 205) and a regeneration unit (300).

Claims

1. A carbon dioxide capture device comprising an absorption unit including an absorption tower that absorbs carbon dioxide in at least a portion of exhaust gas extracted from a scrubber and a regeneration unit that regenerates absorbent discharged from the absorption unit, wherein the regeneration unit includes a regeneration tower into which the absorbent discharged from the absorption unit is initially introduced and another regeneration tower into which the absorbent discharged to the regeneration tower is introduced.

2. In the first paragraph, the absorbent discharged from the other regeneration tower is supplied to the absorption unit, and the carbon dioxide separated from the other regeneration tower is supplied to the regeneration tower into which the absorbent is first introduced, so that the other regeneration tower and the regeneration tower into which the absorbent is first introduced are in fluid communication with each other, a carbon dioxide capture device.

3. In the second paragraph, a carbon dioxide capture device in which an outlet line through which the absorbent discharged from the absorption unit flows to a regeneration tower into which the absorbent discharged from the absorption unit is first introduced is configured to be in fluid communication with the other regeneration tower, and the outlet line includes a heater, and increases the temperature of the absorbent through heat exchange between the combustion gas of the steam boiler and the absorbent.

4. In the third paragraph, the other regeneration tower is a regeneration tower into which the absorbent discharged from the absorption unit is first introduced, and is composed of a stripping area for removing carbon dioxide from the absorbent by applying the discharged absorbent, and a storage area for recovering and storing the absorbent from which carbon dioxide has been removed, and the storage area is a carbon dioxide capture device in fluid communication with the absorption unit.

5. In the fourth paragraph, a heating boiler is additionally included that is in fluid communication with the storage area and the stripping area, recovers the absorbent discharged from the stripping area, reheats it, and supplies the gas including carbon dioxide to the stripping area and supplies the absorbent back to the storage area. The above heating boiler is a carbon dioxide capture device that heat-exchanges steam produced by the steam boiler and absorbent recovered from the stripping area.

6. A carbon dioxide capture device in accordance with paragraph 5, wherein the stripping area and the storage area further include a blocking means for allowing the flow of gas containing carbon dioxide but blocking the flow of the absorbent.

7. In the 6th paragraph, the blocking means includes one or more chimneys defining a long hole through which gas can pass inside and defining a storage space for storing the absorbent, and the storage space defined by the chimneys is in fluid communication with the heating boiler so that the absorbent collected in the storage space can be introduced into the heating boiler. A carbon dioxide capture device.

8. A carbon dioxide capture device according to any one of paragraphs 1 to 7, wherein the regeneration tower and the other regeneration tower are independently configured to be in fluid communication through a conduit.

9. A carbon dioxide capture device according to any one of paragraphs 1 to 7, wherein the regeneration tower and the other regeneration tower are configured as one tower.

10. A carbon dioxide capture device in accordance with paragraph 9, further comprising a blocking means between the regeneration tower and the other regeneration tower, which allows the flow of gas containing carbon dioxide but blocks the flow of the absorbent.

11. In the 10th paragraph, the blocking means for dividing the regeneration tower and the other regeneration tower defines a long hole therein through which gas can pass and includes one or more chimneys for dividing a storage space for storing the absorbent, and the storage space defined by the chimneys is in fluid communication with a heater so that the absorbent collected in the storage space can flow into the other regeneration tower through the heater. A carbon dioxide capture device.

12. A carbon dioxide capture device according to any one of paragraphs 1 to 7, wherein a heater is additionally arranged at a point where an outlet line through which an absorbent discharged from the other regeneration tower and supplied to the absorption unit flows and an outlet line through which an absorbent supplied from the absorption unit to the regeneration tower flows intersect, thereby allowing the absorbents on both sides to exchange heat, thereby lowering the temperature of the absorbent discharged from the other regeneration tower and supplied to the absorption unit and conversely raising the temperature of the absorbent supplied from the absorption unit to the regeneration tower.

13. A carbon dioxide capture device in any one of paragraphs 1 to 7, wherein a heater is additionally placed at a point where an outlet line through which gas containing carbon dioxide discharged from the regeneration tower flows intersects an outlet line through which liquid discharged from the pretreatment unit flows, thereby lowering the temperature of the gas and raising the temperature of the liquid.

14. A carbon dioxide capture device in accordance with paragraph 13, which further includes a water separator on the gas outlet line to condense water vapor contained in the gas and separate only carbon dioxide.

15. A carbon dioxide capture device according to any one of paragraphs 1 to 6, further comprising a pretreatment unit between the scrubber and the absorption unit, wherein the exhaust gas extracted from the scrubber is introduced into the pretreatment unit, adjusted to a predetermined temperature required by the absorption unit, and then introduced into the absorption unit.

16. In the 15th paragraph, the pretreatment unit includes a pretreatment tower configured to be connected to an inlet line into which liquid discharged from a heater of the regeneration unit flows, an inlet line into which exhaust gas partially extracted from the scrubber flows, an outlet line into which liquid discharged from the pretreatment unit flows out, and an outlet line into which the exhaust gas flows out, and a carbon dioxide capture device that increases the temperature of the exhaust gas to a predetermined temperature required by the absorption unit through heat exchange between the liquid of the heater of the regeneration unit and the exhaust gas.

17. In the 16th paragraph, the absorption tower is a carbon dioxide capture device having a hexahedral shape in which the cross-section and the side cross-section have any one shape selected from the group consisting of square and rectangular shapes.

18. A carbon dioxide capture device in accordance with paragraph 17, wherein the absorption tower comprises at least two absorption towers, and the two or more absorption towers are arranged in a horizontal direction and are connected to each other so that the introduced exhaust gas can flow.

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