Carbon dioxide capture device

Abstract

The invention relates to a device for capturing carbon dioxide contained in exhaust gas. More particularly, the present invention relates to a pretreatment unit for washing at least a portion of exhaust gas taken out from a scrubber by means of clean water flowing in from a heater of a regeneration unit, thereby maintaining the temperature of the exhaust gas at an optimum temperature required for absorption in an absorption tower. Therefore, the exhaust gas passing through the pretreatment part can flow into the absorption tower, and the capture efficiency of the carbon dioxide can be improved.

Description

Technical Field

[0001] The present invention relates to a device for capturing carbon dioxide contained in exhaust gas, and in particular to a carbon dioxide capture device comprising a pre-treatment section for washing at least a portion of the exhaust gas taken out from a scrubber by using clean water flowing in from a heater of a regeneration section so that the temperature of the exhaust gas is maintained at an optimal temperature required for absorption in an absorption tower, thereby allowing the exhaust gas passing through the pre-treatment section to flow into the absorption tower and thereby improving the carbon dioxide capture efficiency. Background Art

[0002] In order to reduce the acidic gas, namely carbon dioxide, in the exhaust gas, various technologies such as chemical absorption, adsorption, membrane separation and cryogenics have been developed. Among them, the chemical absorption method is a method of absorbing and capturing carbon dioxide using an absorption liquid. It has been the most widely used because of its high efficiency and stable engineering.

[0003] like Figure 1 The conventional carbon dioxide capture system shown in the figure includes: an absorption tower 91 for removing carbon dioxide in the exhaust gas by combining it with an absorbent; a heat exchanger 93 for receiving the absorbent for absorbing carbon dioxide through a pump P and performing heat exchange; and a regeneration tower 92 for removing carbon dioxide chemically combined with the absorbent after heat exchange. Thus, the carbon dioxide absorption and removal device can perform the carbon dioxide absorption process and the absorption liquid regeneration process (removal process) by using the above structure, and the regenerated absorption liquid will be supplied to the absorption tower 91.

[0004] The exhaust gas flowing into the absorption tower 91 can be taken out of at least a part from a scrubber for reducing sulfur oxides and supplied to the absorption tower 91. The scrubber is a device for removing sulfur oxides contained in the exhaust gas by spraying washing water on the exhaust gas discharged from an engine such as a ship, and seawater is used as the washing water in the ship. As described above, at least a part of the exhaust gas after the sulfur oxides are reduced by seawater will flow into the absorption tower 91. In addition, the exhaust gas flowing into the absorption tower will be absorbed by the absorbent by a chemical reaction with the absorbent as described below.

[0005] Generally speaking, the reaction formula when carbon dioxide is absorbed in an absorbent aqueous solution containing alkanolamine is as follows.

[0006] Reaction 1

[0007]

[0008]

[0009]

[0010]

[0011]

[0012]

[0013] The absorption reaction described above may vary depending on the type of absorbent used, but since the best absorption efficiency is generally shown at an ambient temperature of 35 to 45°C, it is important to maintain the above temperature in the carbon dioxide absorption process. However, in ships, sea water is used as the wash water used in the scrubber, and the temperature of sea water varies greatly within the range of -2 to 32°C depending on the season or region. Therefore, when sea water as described above is used as wash water in the scrubber of a ship sailing in winter, the exhaust gas discharged from the scrubber may be overcooled and thus fail to meet the temperature conditions required for the absorption reaction, resulting in a problem of reduced carbon dioxide absorption efficiency.

[0014] In addition, since ships need to compactly configure a large number of devices in a limited space, there is always a problem of insufficient space. Therefore, for the devices installed on the ship, space optimization is very important. Figure 1 As shown in FIG. 1 , the conventional absorption tower mounted on the ship adopts the round absorption tower used on land, so it has the problem of extremely low space efficiency. Therefore, it is necessary to develop a technology that can improve the absorption efficiency while improving the space efficiency.

[0015] In addition, if Figure 1 As shown, another important technical problem of the carbon dioxide capture device is the regeneration efficiency of the regeneration tower. In the regeneration tower, a process of regenerating the absorbent by separating carbon dioxide from the absorbent that has absorbed carbon dioxide will be carried out, which is different from the absorption tower. The regeneration process as mentioned above is an endothermic reaction that consumes a lot of energy. As mentioned above, the energy required for regenerating the absorbent occupies a considerable part of the energy required for the operation of the entire carbon capture system. Because of the reasons mentioned above, reducing the regeneration energy is a matter directly related to the regeneration efficiency of the absorbent. Therefore, in order to improve the regeneration efficiency of the absorbent, it is necessary to develop a technology that can save regeneration energy.

[0016] Prior art literature

[0017] Patent Literature

[0018] (Patent Document 1) Korean Patent Publication No. 10-2013-0002828 (2013.01.08.)

[0019] (Patent Document 2) Korean Registered Patent Publication No. 10-1709867 (February 17, 2017)

[0020] (Patent Document 3) U.S. Patent Publication No. US 9,272,241 (2016.03.01.) Summary of the invention

[0021] The present invention aims to solve the problems in the prior art as described above, and its objectives are as follows.

[0022] An object of the present invention is to provide a carbon dioxide capture device including a pretreatment section that can increase the temperature of the exhaust gas to the temperature range required by the absorption tower by heat exchange between at least a part of the exhaust gas taken out from the scrubber and clean water used as cooling water for the heater of the regeneration section, thereby improving the carbon dioxide absorption efficiency in the absorption tower.

[0023] Another object of the present invention is to provide a carbon dioxide capture device that can be stably used in winter and even in summer when the seawater temperature rises by being equipped with a cooler. Therefore, the temperature of the clean water discharged from the pre-treatment part can be lowered before it is supplied to the heater of the regeneration part, thereby lowering the temperature of the clean water supplied from the heater to the pre-treatment part to prevent it from overheating, thereby improving the carbon dioxide absorption efficiency in the absorption tower.

[0024] Another object of the present invention is to provide a carbon dioxide capture device that can improve the carbon dioxide absorption efficiency while optimizing the visual space or improving the space utilization by integrating the pre-treatment unit with the scrubber.

[0025] Another object of the present invention is to provide a carbon dioxide capture device that can extend the replacement cycle of clean water and prevent damage to the pre-treatment part, heater, pipes, absorbent, etc. caused by contamination of the clean water by equipping a water treatment part that filters the clean water sprayed from the pre-treatment part.

[0026] Still another object of the present invention is to provide a carbon dioxide capture device having a high absorption capacity compared with the same space occupancy by providing an absorption tower in a hexahedral shape having a square or rectangular planar section and a side section.

[0027] Another object of the present invention is to provide a carbon dioxide capture device that can ensure a high absorption capacity even in a narrow space by arranging at least two absorption towers in a row so as to communicate with each other in the horizontal direction.

[0028] Another object of the present invention is to provide a carbon dioxide capture device that can maximize the uniform carbon dioxide absorption capacity of each absorption tower by adopting a structure in which the regenerated absorbent supplied from the regeneration part is injected sequentially from the absorption tower arranged at the farthest position from the exhaust gas inlet to the absorption tower closest to the exhaust gas inlet, thereby ensuring a higher absorption capacity even in a narrow space.

[0029] Another object of the present invention is to provide a carbon dioxide capture device that can prevent the droplets of the absorbent remaining in the exhaust gas discharged into the atmosphere after removing carbon dioxide from the exhaust gas from being discharged into the atmosphere by equipping the rear end of the absorption tower with a post-treatment tower.

[0030] Another object of the present invention is to provide a carbon dioxide capture device that can condense the droplets of absorbent or clean water that may occur during the washing process in the post-treatment tower by equipping the absorption tower and the upper side of the post-treatment tower with a condensation chamber, thereby preventing the powder from being discharged into the atmosphere.

[0031] Another object of the present invention is to provide a carbon dioxide capture device that can improve the carbon dioxide absorption efficiency by arranging partition walls between at least two or more absorption towers and making the partition walls interconnected to induce the exhaust gas to flow in a desired direction.

[0032] Another object of the present invention is to provide a carbon dioxide capture device that can block the movement of absorbent or water vapor droplets to adjacent absorption towers by equipping the connecting port on the partition wall formed between the absorption towers with a demister, thereby maintaining the concentration of the absorbent in each absorption tower at a required level and thereby improving the carbon dioxide absorption efficiency.

[0033] Another object of the present invention is to provide a carbon dioxide capture device that can share storage space by opening the upper part of the partition wall between the absorption tower farthest from the exhaust gas inlet and the post-treatment tower installed on the rear end of the absorption tower, thereby maintaining the concentration of the absorbent at a required level and thereby improving its absorption efficiency.

[0034] Another object of the present invention is to provide a carbon dioxide capture device that can spray clean water in a buffer tank into the lower area and the upper area of ​​a post-treatment tower respectively, so that the clean water sprayed into the upper area returns to the buffer tank and the clean water sprayed into the lower area does not return to the buffer tank but is supplied to the storage space of an adjacent absorption tower, thereby adjusting the concentration of the absorbent to a required level and thereby continuously maintaining and improving its absorption efficiency.

[0035] Another object of the present invention is to provide a carbon dioxide capture device that can remove foreign matter such as salt and dust contained in the absorbent by equipping an inlet pipe through which the absorbent supplied from the regeneration section flows, thereby preventing damage to the structure of the absorption section and improving the carbon dioxide capture efficiency.

[0036] Another object of the present invention is to provide a carbon dioxide capture device that can improve its absorption efficiency by equipping an inlet pipeline for supplying regenerated absorbent with a cooler for lowering the temperature of the absorbent supplied from the regeneration section so that the absorbent flows into the absorption tower after being cooled to a temperature range most suitable for the absorption reaction in the absorption tower.

[0037] Another object of the present invention is to provide a carbon dioxide capture device that can improve its regeneration efficiency by equipping an outflow pipe with a filter for the absorbent that is finally discharged after absorbing carbon dioxide in an absorption tower to remove foreign matter such as salt and dust remaining in the absorbent and finally flow it into a regeneration tower.

[0038] Another object of the present invention is to provide a carbon dioxide capture device that can save regeneration energy and improve regeneration efficiency by being equipped with a heater that can exchange heat between the absorbent discharged from the regeneration tower into which the absorbent supplied from the absorption part first flows and the combustion gas discharged from the steam boiler, and a heating boiler that can heat the absorbent by heat exchange between the absorbent and steam.

[0039] Another object of the present invention is to provide a carbon dioxide capture device that can save regeneration energy and improve regeneration efficiency by equipping a heater at a position where an outflow pipe through which the absorbent that is finally discharged after absorbing carbon dioxide in the absorption tower flows intersects with an outflow pipe through which the absorbent that has completed regeneration is discharged, thereby increasing the temperature of the absorbent flowing into the regeneration tower.

[0040] Another object of the present invention is to provide a carbon dioxide capture device that can improve the absorption efficiency in the absorption tower by equipping it with a heater that can perform heat exchange between the gas composed of carbon dioxide and water vapor discharged from the regeneration tower and the clean water in the pre-treatment unit, thereby utilizing the waste heat of the gas to increase the temperature of the clean water and thereby increase the temperature of the exhaust gas flowing into the absorption tower.

[0041] In order to achieve the above-mentioned objects, the present invention can be implemented through the embodiments constructed as described below.

[0042] In one embodiment of the present invention, the carbon dioxide capture device of the present invention, as a carbon dioxide capture device including an absorption section for absorbing carbon dioxide in at least a part of the exhaust gas taken out from the scrubber and a regeneration section for regenerating the absorbent discharged from the absorption section, also includes a pretreatment section between the scrubber and the absorption section, and the exhaust gas taken out from the scrubber will flow into the pretreatment section and flow into the absorption section after being adjusted to a certain temperature required by the absorption section.

[0043] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention raises the temperature of the exhaust gas to a certain temperature required by the absorption section by heat exchange between the liquid in the heater of the regeneration section and the exhaust gas.

[0044] In another embodiment of the present invention, the pretreatment section of the carbon dioxide capture device of the present invention includes: a pretreatment tower, which is constructed in a manner connected to an inlet pipeline for liquid discharged from the heater of the regeneration section, an inlet pipeline for a portion of the exhaust gas taken out from the scrubber, an outflow pipeline for liquid discharged from the pretreatment section to flow out, and an outflow pipeline for the exhaust gas to flow out.

[0045] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention is configured such that an outflow pipe of the exhaust gas of the pre-treatment section is connected to the absorption section, and a blower is provided on the outflow pipe of the exhaust gas to force the exhaust gas of the pre-treatment section to be supplied to the absorption section.

[0046] In another embodiment of the present invention, the pretreatment section of the carbon dioxide capture device of the present invention further includes a nozzle for spraying liquid flowing into the heater of the pretreatment section onto the exhaust gas, thereby raising the temperature of the exhaust gas through contact between the liquid sprayed from the nozzle and the exhaust gas.

[0047] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention, the outflow pipe and the inflow pipe of the liquid form a closed loop by being connected to the heater fluid of the regeneration section, so that the liquid flowing into the pre-treatment section repeatedly returns to the heater.

[0048] In another embodiment of the present invention, the pre-treatment part of the carbon dioxide capture device of the present invention further includes a heat exchanger on the outflow pipeline of the liquid, so that the temperature of the liquid is cooled to a certain temperature through heat exchange between seawater and the liquid in the heat exchanger and then flows into the heater.

[0049] In another embodiment of the present invention, the pretreatment section of the carbon dioxide capture device of the present invention includes a storage space for storing the liquid at the lower part of the pretreatment tower, one end of the exhaust gas outflow pipe is located on the upper side of the storage space, and one end of the liquid outflow pipe is fluidically connected to the storage space.

[0050] In another embodiment of the present invention, the pre-treatment part of the carbon dioxide capture device of the present invention further includes a water treatment part constructed in a manner of forming a closed loop with the storage space, and the water treatment part supplies filtered liquid to the heater after removing foreign matter contained in the liquid stored in the storage space.

[0051] In still another embodiment of the present invention, in the pre-treatment section of the carbon dioxide capture device of the present invention, the pre-treatment tower and the scrubber are integrally constructed.

[0052] In another embodiment of the present invention, the absorption tower in the pretreatment part of the carbon dioxide capture device of the present invention is constructed in a hexahedral shape whose planar section and side section are selected from the group consisting of square and rectangular shapes.

[0053] In another embodiment of the present invention, the absorption tower in the pre-treatment part of the carbon dioxide capture device of the present invention includes at least two absorption towers, and the two or more absorption towers are arranged continuously in the horizontal direction and are interconnected to allow the exhaust gas flowing in.

[0054] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention, the absorption section also includes a post-treatment tower connected to the absorption tower at the rear end of the absorption tower, and the exhaust gas flowing out of the absorption tower will flow into the post-treatment tower and remove the droplets of the absorbent contained in the exhaust gas.

[0055] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention also includes a condensation chamber at the end of the post-treatment tower that can allow the exhausted exhaust gas to retain for a certain period of time, and the condensation chamber is a hexahedral space formed in the horizontal direction across the absorption tower and the upper part of the post-treatment tower.

[0056] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention, the regeneration section includes a regeneration tower into which the absorbent discharged from the absorption section initially flows and another regeneration tower into which the absorbent discharged from the regeneration tower flows.

[0057] In another embodiment of the present invention, in the pre-treatment section of the carbon dioxide capture device of the present invention, the other regeneration tower and the regeneration tower into which the absorbent initially flows are fluidly connected to each other, so 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 initially flows, and the outflow pipeline through which the absorbent discharged from the regeneration tower into which the absorbent discharged from the absorption section initially flows is fluidly connected to the other regeneration tower, and a heater is included on the outflow pipeline, and the temperature of the absorbent is increased by heat exchange between the combustion gas of the steam boiler and the absorbent.

[0058] In another embodiment of the present invention, the pre-treatment section of the carbon dioxide capture device of the present invention, the other regeneration tower is composed of a removal area for removing carbon dioxide from the absorbent by coating the absorbent discharged from the regeneration tower into which the absorbent discharged from the absorption section initially flows, and a storage area for recovering and storing the absorbent from which the carbon dioxide has been removed, and the storage area is fluidly connected to the absorption section, and also includes a heating boiler that is fluidly connected to the storage area and the removal area and supplies a gas containing carbon dioxide to the removal area and resupplys the absorbent to the storage area after recovering and reheating the absorbent discharged from the removal area, and the heating boiler performs heat exchange between the steam generated by the steam boiler and the absorbent recovered from the removal area.

[0059] The present invention can achieve the following effects through the configuration of the above-mentioned embodiments.

[0060] The present invention includes a pretreatment section that can raise the temperature of the exhaust gas to the temperature range required by the absorption tower by heat exchange between at least a portion of the exhaust gas taken out from the scrubber and clean water used as cooling water for the heater of the regeneration section, thereby improving the carbon dioxide absorption efficiency in the absorption tower.

[0061] The present invention can be used stably in winter and even in summer when the seawater temperature rises by being equipped with a cooler. Therefore, the temperature of the clean water discharged from the pre-treatment part can be lowered before being supplied to the heater of the regeneration part, thereby lowering the temperature of the clean water supplied from the heater to the pre-treatment part to prevent it from overheating, thereby improving the carbon dioxide absorption efficiency in the absorption tower.

[0062] The present invention can improve the carbon dioxide absorption efficiency while optimizing the visual space or improving the space utilization rate by integrating the pre-treatment unit with the scrubber.

[0063] The present invention can extend the replacement cycle of clean water and prevent damage to the pre-treatment unit, heater, pipeline and absorbent due to clean water contamination by equipping the water treatment unit for filtering the clean water sprayed from the pre-treatment unit.

[0064] The present invention can have a high absorption capacity compared with the same space occupancy by providing an absorption tower in a hexahedral shape whose plane section and side section are square or rectangular.

[0065] The present invention can ensure a high absorption capacity even in a narrow space by arranging at least two absorption towers in a row so as to communicate with each other in the horizontal direction.

[0066] The present invention can maximize the uniform carbon dioxide absorption capacity of each absorption tower by adopting a structure in which the regenerated absorbent supplied from the regeneration part is sprayed sequentially from the absorption tower arranged at the position farthest from the exhaust gas inlet to the absorption tower closest to the exhaust gas inlet, thereby ensuring a high absorption capacity even in a narrow space.

[0067] The present invention can prevent the droplets of the absorbent remaining in the exhaust gas discharged into the atmosphere after removing carbon dioxide from being discharged into the atmosphere by arranging a post-treatment tower at the rear end of the absorption tower.

[0068] The present invention can condense the droplets of absorbent or clean water that may occur during the washing process in the post-treatment tower by equipping the upper side of the absorption tower and the post-treatment tower with a condensation chamber, thereby preventing the powder from being discharged into the atmosphere.

[0069] The present invention can improve the absorption efficiency of carbon dioxide by respectively arranging partition walls between at least two or more absorption towers and making the partition walls interconnected to induce the exhaust gas to flow in a desired direction.

[0070] The present invention can block the absorbent or water vapor droplets from moving to adjacent absorption towers by equipping the communication port on the partition wall formed between the absorption towers with a demister, thereby maintaining the absorbent concentration in each absorption tower at a required level and thereby improving the carbon dioxide absorption efficiency.

[0071] The present invention can share the storage space by opening the upper part of the partition wall between the absorption tower farthest from the exhaust gas inlet and the post-treatment tower installed on the rear end of the absorption tower, thereby maintaining the concentration of the absorbent at the required level and thereby improving its absorption efficiency.

[0072] The present invention can adopt a structure in which the clean water in the buffer tank is sprayed into the lower area and the upper area of ​​the post-treatment tower respectively, so that the clean water sprayed into the upper area returns to the buffer tank and the clean water sprayed into the lower area does not return to the buffer tank but is supplied to the storage space of the adjacent absorption tower, thereby adjusting the concentration of the absorbent to the required level and thereby continuously maintaining and improving its absorption efficiency.

[0073] The present invention can remove foreign matters such as salt and dust contained in the absorbent by arranging a filter on the inflow pipe through which the absorbent supplied from the regeneration unit flows, thereby preventing the structure of the absorption unit from being damaged and improving the carbon dioxide capture efficiency.

[0074] The present invention can improve the absorption efficiency by equipping the inlet pipeline for supplying the regenerated absorbent with a cooler for lowering the temperature of the absorbent supplied from the regeneration unit so that the absorbent flows into the absorption tower after being cooled to a temperature range most suitable for the absorption reaction in the absorption tower.

[0075] The present invention can improve the regeneration efficiency by equipping the outflow pipeline through which the absorbent discharged after absorbing carbon dioxide in the absorption tower flows, thereby removing foreign matter such as salt and dust remaining in the absorbent and finally flowing it into the regeneration tower.

[0076] The present invention can save regeneration energy and improve regeneration efficiency by equipping a heater that can heat exchange the absorbent discharged from the regeneration tower into which the absorbent supplied from the absorption part first flows with the combustion gas discharged from the steam boiler, and a heating boiler that can heat the absorbent through heat exchange between the absorbent and steam.

[0077] The present invention can increase the temperature of the absorbent flowing into the regeneration tower by equipping a heater at the intersection of the outflow pipe for the absorbent that is finally discharged after absorbing carbon dioxide in the absorption tower and the outflow pipe for the absorbent that has completed regeneration and can discharge the absorbent, thereby saving regeneration energy and improving regeneration efficiency.

[0078] The present invention can improve the absorption efficiency in the absorption tower by equipping a heater that can perform heat exchange between the gas composed of carbon dioxide and water vapor discharged from the regeneration tower and the clean water in the pre-treatment unit, thereby utilizing the waste heat of the gas to increase the temperature of the clean water and thereby increase the temperature of the exhaust gas flowing into the absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 This is a schematic diagram of an existing carbon dioxide capture device.

[0080] Figure 2is a schematic diagram of a carbon dioxide capture device according to one embodiment of the present invention.

[0081] Figure 3 Is additional Figure 2 An oblique view of the scrubber of the pre-treatment section shown in FIG.

[0082] Figure 4 yes Figure 2 Schematic diagram of the pre-processing unit shown in FIG.

[0083] Figure 5 yes Figure 2 An oblique view of the absorption tower shown in FIG.

[0084] Figure 6 yes Figure 2 A front view of the absorption tower shown in FIG.

[0085] Figure 7a yes Figure 2 A side view of the absorption tower shown in FIG.

[0086] Figure 7b yes Figure 2 A plan view of the absorption tower shown in FIG.

[0087] Figure 8a yes Figure 2 Schematic diagram of the absorption part shown in FIG.

[0088] Figure 8b yes Figure 8a Schematic diagram of the post-treatment tower shown in FIG.

[0089] Fig. 9 yes Figure 2 An enlarged view of the flue tray is shown in FIG.

[0090] Fig.10 yes Figure 2 An enlarged view of the condensation chamber is shown in FIG.

[0091] Fig.11 yes Figure 2 Schematic diagram of the regeneration unit shown in FIG.

[0092] Fig.12 FIG. 4 is a schematic diagram of a regeneration unit of a carbon dioxide capture device according to another embodiment of the present invention.

[0093] Fig.13 It is a schematic diagram of a carbon dioxide capture device consisting of a pre-treatment unit, an absorption tower and a regeneration unit according to another embodiment of the present invention.

[0094] Fig.14It is a schematic diagram of a carbon dioxide capture device consisting of a pre-treatment unit, an absorption tower, a post-treatment tower and a regeneration unit according to another embodiment of the present invention.

[0095] Fig.15 It is a schematic diagram of a carbon dioxide capture device consisting of a pre-treatment unit, three absorption towers, a post-treatment tower and a regeneration unit according to another embodiment of the present invention.

[0096] Fig.16 Schematic diagram of a carbon dioxide capture device consisting of two absorption towers, a post-treatment tower and a regeneration unit according to another embodiment of the present invention.

[0097] Fig.17 Schematic diagram of a carbon dioxide capture device consisting of three absorption towers, a post-treatment tower and a regeneration unit according to another embodiment of the present invention.

[0098] Fig.18 Schematic diagram of a carbon dioxide capture device consisting of four absorption towers, a post-treatment tower and a regeneration unit according to another embodiment of the present invention.

[0099] Fig.19 FIG. 4 is a schematic diagram of a carbon dioxide capture device consisting of two absorption towers and a regeneration unit according to another embodiment of the present invention.

[0100] Fig. 20 FIG. 4 is a schematic diagram of a carbon dioxide capture device consisting of three absorption towers and a regeneration unit according to another embodiment of the present invention.

[0101] Fig.21 FIG. 4 is a schematic diagram of a carbon dioxide capture device consisting of four absorption towers and a regeneration unit according to another embodiment of the present invention.

[0102]

Explanation of symbols

[0103] 10: Scrubber

[0104] 100: Pre-processing unit

[0105] 101: Pretreatment tower

[0106] 102: Inflow pipeline (exhaust gas)

[0107] 103: Nozzle

[0108] 104: Inlet (exhaust gas)

[0109] 105: Filler

[0110] 107: Inlet (clean water)

[0111] 109: Outlet (exhaust gas)

[0112] 110: Outlet (clean water)

[0113] 111: Inflow pipe (clean water)

[0114] 113: Outflow pipeline (exhaust gas)

[0115] 115: Blower

[0116] 116: Outflow pipe (clean water)

[0117] 118: Supply pipeline (seawater)

[0118] 120: Heat exchanger

[0119] 130: Water treatment department

[0120] 132: Remove the pipeline

[0121] 134: Return line

[0122] 200: Absorption

[0123] 201: Shell

[0124] 202: Absorption Tower

[0125] 203: Benchmark Absorption Tower

[0126] 203a: Storage space

[0127] 205: Regeneration absorption tower

[0128] 205a: Storage space

[0129] 204: Post-treatment tower

[0130] 204a: Storage space

[0131] 205b: Inlet

[0132] 203a: Inlet

[0133] 206: Filling (first absorption tower)

[0134] 207: Nozzle

[0135] 208: Demisting device

[0136] 209: partition wall (between the first absorption tower and the second absorption tower)

[0137] 210: Nozzle

[0138] 212: Dividing wall (between the second absorption tower and the post-treatment tower)

[0139] 214a, b: connecting port

[0140] 216: Connecting port

[0141] 217: Lower side

[0142] 220: Filler

[0143] 222: Nozzle

[0144] 224: Demisting device

[0145] 226: Filler

[0146] 227: Nozzle

[0147] 228: Demisting device

[0148] 230: Flue Tray

[0149] 240: Condensation chamber

[0150] 242: Demisting device

[0151] 250: Buffer tank

[0152] 252: Outflow pipe (clean water)

[0153] 253: Inflow pipeline (clean water)

[0154] 254: Outflow pipeline (gas)

[0155] 255: Inflow pipeline (clean water)

[0156] 256: Recovery pipeline (clean water)

[0157] 258: Recovery pipeline (clean water)

[0158] 259: Inflow pipeline (clean water)

[0159] 260: Inflow pipeline (absorbent)

[0160] 262: Cooler

[0161] 263: Cooling water pipeline

[0162] 264: Filter

[0163] 270: Outflow pipeline (absorbent)

[0164] 272: Outflow pipeline (absorbent)

[0165] 274: Filter

[0166] 280: Cooler

[0167] 282: Cooling water pipeline (seawater)

[0168] 300: Regeneration Department

[0169] 301: Regeneration Tower

[0170] 303: Shell

[0171] 304: Sump

[0172] 305: Interior Space

[0173] 307: Primary filler

[0174] 309: Nozzle

[0175] 310: Heater

[0176] 311: Secondary filler

[0177] 313: Demisting device

[0178] 315: Outflow pipeline (carbon dioxide, water vapor)

[0179] 320: Gas-Liquid Separator

[0180] 324: Outflow pipeline (carbon dioxide)

[0181] 322: Discharge pipeline (condensate)

[0182] 330: Heater

[0183] 335: Flow lines (carbon dioxide, water vapor)

[0184] 340: Adjacent regeneration tower

[0185] 343: Shell

[0186] 344: Liquid collection tank

[0187] 345: Interior Space

[0188] 346: Nozzle

[0189] 347: Filler

[0190] 348: Filler

[0191] 350: Flue Tray

[0192] 360: Heating boiler

[0193] 362: Outflow pipeline (gas)

[0194] 364: Recovery pipeline (absorbent)

[0195] 366: Inflow pipeline (absorbent)

[0196] 370: Steam boiler

[0197] 372: Inflow pipeline (steam)

[0198] 374: Outflow pipeline (steam)

[0199] 376: Outflow pipeline (exhaust gas)

[0200] 380: Heater

[0201] 390: Outflow pipeline (absorbent)

[0202] 392: Outflow pipeline (absorbent) DETAILED DESCRIPTION

[0203] Next, the applicant will explain the embodiments described in the above content in detail with reference to the accompanying drawings.

[0204] Figure 2 Schematic diagram of a carbon dioxide capture device according to one embodiment of the present invention. The exhaust gas discharged from the engine of a ship contains substances that induce environmental pollution, such as sulfur oxides and carbon dioxide. The exhaust gas containing the substances that induce environmental pollution as described above will be supplied to a sulfur oxide reduction device called a scrubber, and the exhaust gas after the sulfur oxides are reduced in the device will be discharged into the atmosphere. However, because the exhaust gas after the sulfur oxides are reduced still contains carbon dioxide, the exhaust gas after passing through the scrubber will not be discharged directly into the atmosphere, but at least a part of the exhaust gas will be taken out from the side and supplied to the carbon dioxide capture device 1 of the present invention, so as to capture the carbon dioxide contained in the exhaust gas and discharge the exhaust gas after the removal or reduction of carbon dioxide into the atmosphere.

[0205] See also Figure 2 The carbon dioxide capture device 1 of the present invention includes: a pre-treatment section 100, which takes out at least a part of the exhaust gas discharged from a scrubber 10 from the side and heats it to a certain temperature; an absorption section 200, which absorbs carbon dioxide in the exhaust gas by spraying an absorbent on the exhaust gas heated in the pre-treatment section 100; and a regeneration section 300, which receives the absorbent after absorbing carbon dioxide in the absorption section 200 and removes carbon dioxide from the absorbent, and then transfers the absorbent to the absorption section again.

[0206] Figure 3 Is additional Figure 2 The oblique view of the scrubber of the pre-treatment section shown in FIG. Figure 4 yes Figure 2The schematic diagram of the pre-treatment unit shown in FIG. The pre-treatment unit 100 includes: a pre-treatment tower 101, into which at least a portion of the exhaust gas taken out from the side of the scrubber 10 can flow; an inlet pipeline 102, which is connected to the pre-treatment tower in a fluid communication manner and into which the exhaust gas can flow; an inlet pipeline 111, into which clean water can flow; an outflow pipeline 113, from which the exhaust gas can flow out; a water treatment unit 130, which purifies the contaminated clean water; a heat exchanger 120, which is attached to the outflow pipeline 116 of the clean water; and a blower 115, which is attached to the outflow pipeline 113 of the exhaust gas.

[0207] The pre-treatment tower 101 is a space for washing at least a portion of the exhaust gas taken out from the side of the scrubber 10 with clean water, and is generally in the shape of a rectangular parallelepiped or a cube. The rectangular parallelepiped and the cube shape can ensure the maximum space efficiency in the special environment of the ship where the space is insufficient. For the reasons mentioned above, the scrubber 10 is preferably in the same cube or rectangular parallelepiped shape as the pre-treatment tower. Figure 3 As shown, it is composed of an inlet 11 for the exhaust gas discharged from the engine to flow in, a main body 14 that plays a washing role of reducing sulfur oxides by spraying a washing liquid such as seawater to the exhaust gas flowing in, and an outlet 13 for discharging the exhaust gas after reducing sulfur oxides. The present invention takes out a part of the exhaust gas after reducing sulfur oxides from the side before discharging it to the outlet 13 and supplies it to the pre-treatment tower 101. The pre-treatment tower 101 takes out a part of the exhaust gas through an inlet pipe 102 connected to the upper end of the main body 14 and the pre-treatment tower fluid. As shown Figure 3 As shown, the pre-treatment tower 101 is preferably equipped with the scrubber in one piece while taking out the exhaust gas from the side through the inflow pipe 102. With the above-mentioned integrated configuration, there is no need to install an additional duct, so the pre-treatment tower can be effectively installed in the narrow space of the ship, and then the pre-treatment tower with an increased size can be installed, so as to take out more exhaust gas for treatment in the same space.

[0208] The pretreatment tower 101 includes an exhaust gas inlet 104 , a clean water inlet 107 , a nozzle 103 , a filler 105 , a storage space 108 , a clean water outlet 110 , an exhaust gas outlet 109 , and a demister 106 .

[0209] The inlet 104 is connected to the inlet pipe 102 in a fluid communication manner to facilitate the inflow of exhaust gas taken out from the scrubber.

[0210] The inlet 107 is connected in a fluid communication manner to an inlet pipe 111 through which a certain amount of clean water stored in the storage space 108 is returned in a heated state after heat exchange in a heater 330 of a regeneration unit described later.

[0211] The nozzle 103 is configured to spray the clean water flowing in from the inlet 107 , and sprays the clean water toward the storage space 108 along the direction of gravity.

[0212] The filler 105 is a stack located at the lower side of the nozzle, which can make the clean water sprayed on the stack adhere to the surface and stay for a certain period of time, thereby increasing the contact time and contact area with the exhaust gas, thereby raising the temperature of the exhaust gas through heat exchange and removing foreign matter to the maximum extent. The sea water used to reduce sulfur oxides in the scrubber 10 may be in a low temperature state of about -2 to 15°C in some areas in winter, so the exhaust gas discharged from the scrubber in winter may be overcooled and discharged at a state of about 10 to 25°C. However, because the temperature range is lower than the temperature required for the absorption reaction of carbon dioxide in the absorption tower, that is, 35 to 45°C, the absorption rate of carbon dioxide in the absorption tower will decrease in winter. However, in the present invention, the temperature of the exhaust gas can be raised to the temperature range required for the absorption reaction by making the clean water sprayed from the nozzle contact with the exhaust gas, thereby solving the above-mentioned problems.

[0213] The storage space 108 refers to a certain space at the bottom of the pretreatment tower, which is used to store the fallen clean water. A certain amount of clean water is always stored in the space, so that the clean water circulates along a closed loop formed by an inlet pipe 111 and an outlet pipe 116 equipped between the pretreatment tower and the heater of the regenerator described later.

[0214] The outflow port 110 is an outlet for the clean water stored in the storage space 108 to flow out, and can be connected to the outflow pipe 116 in a fluid communication manner to supply the clean water to the heater 330 .

[0215] The outlet 109 is an outlet for exhaust gas after heating formed between the upper end of the storage space 108 and the lower end of the filler 106, and is in fluid communication with the outlet pipe 113 for the exhaust gas to flow. As described above, since the exhaust gas heated to 35-45° C. is provided to the absorption tower through the outlet pipe 113, the absorption rate of carbon dioxide in the absorption tower can be increased without a separate heating process.

[0216] The demister 106 is installed in the outflow port 109 to filter the clean water droplets contained in the exhaust gas, and can block the clean water droplets from being discharged from the outflow port 109 and flowing into the absorption part together with the exhaust gas. A variety of known demister structures can be used. As described later, more than two spatially independent absorption towers can be provided in the absorption part, and because the absorbent concentration is specified in each absorption tower, when the clean water droplets flow into the absorption part, it may cause a change in the absorbent concentration and further lead to a problem of decreased absorption efficiency of carbon dioxide. Therefore, in order to maintain the absorbent concentration specified in each absorption tower, it is necessary to block the flow of water into the absorption part.

[0217] The exhaust gas flowing into the pre-treatment tower may contain a variety of foreign matter such as salt, so the water treatment unit 130 is configured in a manner that is fluidly connected to the storage space 108 in order to remove the foreign matter as described above. The water treatment unit can be applied to a variety of known water treatment technologies, preferably a membrane type. The water treatment unit 130 can be discharged into the outflow pipeline 116 through the return pipeline 134 configured in a manner that is fluidly connected to the outflow pipeline 116 after the clean water flows in through the extraction pipeline 132 that is fluidly connected to the storage space 108 and the water is treated, thereby supplying the purified clean water to the heater 330, thereby preventing the outflow pipeline 116 and the heater 330 from being damaged by foreign matter. When one end of the return pipeline is directly fluidly connected to the outflow pipeline 116 instead of the storage space 108, it helps to reduce the contamination on the outflow pipeline 116 compared to the case where the fluid is directly connected to the storage space 108.

[0218] The heat exchanger 120 is provided on the clean water outflow pipe 116 to cool the temperature of the clean water flowing into the heater. In winter, there is a problem that the exhaust gas in the scrubber is overcooled by seawater, but in summer, the temperature of the seawater rises to 32°C, which causes the exhaust gas temperature to exceed the 35-45°C required by the absorption tower when the temperature is increased in the pretreatment tower. Therefore, the clean water flowing in the outflow pipe 116 can be adjusted to the temperature range of the seawater by heat exchange with the seawater supplied through the seawater supply pipe 118, thereby preventing the exhaust gas supplied to the absorption tower from being overheated.

[0219] The blower 115 is installed on the outflow pipe 113 of the exhaust gas, and can forcibly suck the exhaust gas in the pre-treatment tower 101 and provide it to the absorption tower. Through the forced suction of the blower, the exhaust gas of the scrubber can be forced to flow into the interior of the pre-treatment tower 101 through the inflow pipe 102, and after passing through the filler 105, it flows into the absorption tower along the outflow pipe 113.

[0220] Figure 5 yes Figure 2 The oblique view of the absorption tower shown in FIG. Figure 6 yes Figure 2 The front view of the absorption tower shown in FIG. Figure 7a yes Figure 2 The side view of the absorption tower shown in FIG. Figure 7b It is a floor plan. Figure 8a yes Figure 2 Schematic diagram of the absorption part shown in FIG.

[0221] like Figure 8a As shown, the absorption part 200 includes an outflow pipeline 113 for exhaust gas, an inflow pipeline 260 for absorbent, and an absorption tower 202 in fluid communication with the outflow pipelines 270 and 272 .

[0222] Taking into account the characteristics of the site where the present invention is applied, namely the ship, the absorption tower 202 adopts a shape and structure that can improve its spatial efficiency. The term "spatial efficiency" used in this application refers to the ratio of the internal volume (the volume of the space available for exhaust gas flow) of the absorption tower of the carbon dioxide capture device installed in the same volume of ship space. Therefore, the higher the ratio of the internal volume of the absorption tower compared to the same volume, it can be said that the "spatial efficiency" is higher. The definition as described above also applies to the pretreatment tower. Regarding the absorption tower 202, in Figure 7a The projection surface (or section) projected onto the ground in the side view is the same as Figure 7b The projection surface (or cross section) projected onto the ground in the plan view is a rectangle or a square. Therefore, compared with the existing cylindrical absorption tower, a higher space efficiency can be ensured, thereby taking out a relatively large amount of exhaust gas from the scrubber for treatment and thereby improving the absorption efficiency of carbon dioxide.

[0223] The absorption tower 202 includes a hexahedral shell 201 whose projection on the side and plane is a rectangle or square, and the shell defines an absorption space for spraying absorbent and absorbing carbon dioxide in the exhaust gas through the absorbent. The absorption space can be considered to be equivalent to the internal volume of the absorption tower as described above, but in the embodiment with additional post-treatment described below, the internal volume of the post-treatment tower will be excluded. The absorption tower 202 includes an inlet 202a for exhaust gas to flow in and an outlet 202b for exhaust gas to flow out, and as shown in FIG. Figure 8a As shown in FIG. 2 and FIG. 2 b, the inlet 202a is connected to the outlet pipe 113 of the exhaust gas in a fluid communication manner.

[0224] The absorption tower 202 may include an absorption tower 205 into which the regenerated absorbent supplied from the regeneration section initially flows, and an absorption tower 203 formed with an inlet 202a for exhaust gas. The absorption tower 203 into which the exhaust gas initially flows may be referred to as a "reference absorption tower", and the absorption tower 205 into which the regenerated absorbent supplied from the regeneration section initially flows may be referred to as a "regeneration absorption tower". The regeneration absorption tower refers to an absorption tower located at the farthest position from the reference absorption tower. In the present application, for the convenience of explanation, the reference absorption tower 205 and the regeneration absorption tower 203 are taken as examples, but one or more absorption towers may be additionally included between the absorption towers. Therefore, one or more absorption towers may be additionally provided between the regeneration absorption tower 205 into which the regenerated absorbent supplied from the regeneration section initially flows, and the reference absorption tower 203 formed with the inlet 202a for exhaust gas. In addition, among adjacent absorption towers, "adjacent absorption towers" refer to such as Figure 8a Absorbers shown are located successively to the right or left of a particular absorber.

[0225] The two or more absorption towers 203, 205 are arranged in a continuous manner in the horizontal direction, and are interconnected to allow the exhaust gas inside to flow. The "absorption towers are connected" means that although the absorption towers are separated from each other by the partition wall 209, the exhaust gas can flow through the connecting ports 214a, 214b provided on one side of the partition wall.

[0226] The regeneration absorption tower 205 includes: an inlet 205b, which is fluidically connected to an inlet pipe 260 through which the regenerated absorbent supplied from the regeneration unit flows; a nozzle 210, which is used to spray the absorbent flowing from the inlet 205b in the direction of gravity; a filler 218, which allows the absorbent sprayed from the nozzle to adhere to the surface and flow while contacting with the exhaust gas to absorb carbon dioxide; a storage space 205a, which is used to store the absorbent falling to the bottom; and an outlet 205c, which is fluidically connected to the storage space 205a and the outlet pipe 270. The regenerated absorbent supplied from the regeneration unit is first supplied to the regeneration absorption tower 205, which is fluidically connected to the inlet pipe 260, and sprayed in the direction of gravity through the nozzle 201, and then contacts with the exhaust gas flowing from the reference absorption tower 203 in the internal space of the regeneration absorption tower to absorb carbon dioxide in the exhaust gas. Next, the absorbent that has fallen after capturing carbon dioxide is stored in the storage space 205a located at the lower part of the regeneration absorption tower 205, and then flows out to the outflow pipeline 270 through the outflow outlet 205c connected to the fluid therewith, and then is supplied to the adjacent absorption tower, that is, the reference absorption tower 203. Fig.15 , 17 As shown in FIG. 20, when another regeneration tower 213 is provided between the regeneration absorption tower 205 and the reference regeneration tower 203, the absorbent flowing out of the regeneration absorption tower will be supplied to the adjacent regeneration tower 213 to absorb carbon dioxide and then finally supplied to the reference regeneration tower 203 to absorb carbon dioxide. Fig.18As shown in FIG. 21, when two regeneration towers 213 and 214 are provided, the absorbent discharged from the regeneration absorption tower 205 will be supplied to the adjacent regeneration tower 214 to absorb carbon dioxide, and then the discharged absorbent will be supplied to the adjacent regeneration tower 213 again to absorb carbon dioxide, and finally the discharged absorbent will be supplied to the reference absorption tower 203 to absorb carbon dioxide. As described above, the exhaust gas flows from the reference absorption tower 203 to the regeneration absorption tower 205, and the absorbent is first sprayed in the regeneration absorption tower 205, and then the discharged absorbent is supplied to the adjacent absorption towers 213 and 214 and finally sprayed in the reference absorption tower 203, so the injection order of the absorbent is opposite to the flow direction of the exhaust gas. Since the absorbent that has completed regeneration and is supplied to the absorption part is in a "lean" state, the carbon dioxide absorption capacity is the best, but on the contrary, the carbon dioxide absorption capacity of the absorbent in a "rich" state after absorbing carbon dioxide to a certain extent will be lower than that of the absorbent in a "lean" state. In addition, the concentration of carbon dioxide in the exhaust gas flowing into the reference regeneration tower 203 is the highest, so it is easily absorbed by the absorbent, but on the contrary, the concentration of carbon dioxide in the exhaust gas will become lower as it flows toward the regeneration tower, so the ability to be absorbed by the absorbent will also decrease. Therefore, when the exhaust gas moves from the reference absorption tower 203 to the regeneration absorption tower 205, the concentration of carbon dioxide will gradually decrease, so the absorbent in the most "lean" state will be first supplied to the regeneration absorption tower 205 and improve the carbon dioxide absorption capacity, and the absorbent discharged next will be supplied to the adjacent absorption tower with a higher carbon dioxide concentration than the regeneration absorption tower, so even the absorbent in a more "rich" state than the absorbent in the regeneration absorption tower can ensure an absorption capacity similar to that in the regeneration absorption tower. The absorbent that is finally supplied to the reference regeneration tower 203 is the absorbent in the most "rich" state, but because the concentration of carbon dioxide is the highest, an absorption capacity similar to that in other absorption towers can be guaranteed. In addition, the flow rate of the exhaust gas in the absorption tower gradually slows down from the reference absorption tower to the regeneration absorption tower, so even if the absorbent in the "lean" state is sprayed into the reference absorption tower 203, there will be carbon dioxide that is not absorbed by the reference absorption tower and moves to the side of the regeneration absorption tower. This is one of the reasons for applying the absorbent in the order as described above. In the manner described above, the uniform carbon dioxide absorption capacity of each absorption tower can be guaranteed, thereby improving the carbon dioxide absorption capacity as a whole.

[0227] The packings 206 and 218 carried inside the absorption tower are configured to adsorb the injected absorbent and retain it for a certain period of time, and the absorbent and the exhaust gas will come into contact therein, so that the absorbent absorbs carbon dioxide through the reaction described above.

[0228] like Figure 8a As shown, the absorption towers are separated from each other in space by partition walls 209, and include interconnecting ports 214a. The absorption tower 203 is a reference absorption tower for the exhaust gas to initially flow in. The exhaust gas flowing in through the inlet 202a formed at the lower part will move upward and contact with the "absorbent supplied from the adjacent regeneration tower 205" sprayed in the direction of gravity through the nozzle 207, thereby removing carbon dioxide, and the absorbent absorbing carbon dioxide will fall and be stored in the storage space 203a at the lower part, and then be supplied to the regeneration part through the outflow pipeline 272 connected to the outlet 203c in a fluid-connected manner. In addition, the exhaust gas after removing a certain amount of carbon dioxide will flow into the adjacent regeneration tower 205 through the interconnecting port 214a located at the upper side.

[0229] In another embodiment of the present invention, a demister 208 may be provided on the connecting port 214a. The demister 208 filters the absorbent droplets or moisture contained in the exhaust gas or present in the internal space of the absorption tower 203 as described above, thereby preventing it from moving to an adjacent absorption tower. The absorbent is usually in the form of a composition of an amine compound and water, so during the absorption reaction, the absorbent may be converted into a droplet form or the water component in the absorbent may be converted into a water vapor form and flow into the absorption tower. In the above case, the absorbent concentration in the absorption tower or the adjacent absorption tower will change, resulting in the problem of not being able to achieve the desired level of carbon dioxide absorption efficiency. Therefore, the demister can be used to prevent the liquid droplets generated in each absorption tower from flowing into an adjacent absorption tower, thereby stably maintaining the absorbent concentration and thereby improving the carbon dioxide absorption efficiency.

[0230] Next, the absorbent sprayed from the adjacent absorption tower 205 will form a flow in the same direction as the exhaust gas transmitted from the absorption tower 203, thereby absorbing carbon dioxide.

[0231] In another embodiment of the present invention, the absorption tower 202 may further include a post-treatment tower 204 at the rear end of the regeneration absorption tower 205 .

[0232] The post-treatment tower 204 can play the role of washing and removing the absorbent droplets contained in the exhaust gas before the exhaust gas that has completed the carbon dioxide absorption process is directly discharged into the atmosphere. The regeneration absorption tower 205 in the absorption tower 202 is constructed in a manner connected to the rear end and is spatially divided by the partition wall 212, and is equipped with a communication port 214b on its lower side, so that the exhaust gas of the regeneration absorption tower 205 can be moved to the post-treatment tower 204 through the communication port 214b. The communication port 214b of the post-treatment tower is formed on the lower side of the partition wall 212, that is, the upper side of the storage space 205a and the lower side of the filler 208.

[0233] like Figure 8b As shown in FIG. 1 , since the absorbent concentration in the post-treatment tower 204 increases during the absorption process, the post-treatment tower 204 is composed of a lower region 204b for replenishing water to adjust the increased absorbent concentration to a certain level and an upper region 204c for washing the absorbent contained in the exhaust gas. Although there is an optimal absorbent concentration for effectively absorbing carbon dioxide, the absorbent concentration increases due to evaporation of water as the absorption process progresses, thereby causing a problem of decreased carbon dioxide absorption efficiency.

[0234] The lower area 204b includes a supplementary water inlet 222a, a filler 220, a nozzle 222, a demister 224, and a storage space 204a.

[0235] The supplementary water inlet 222a is in fluid communication with the buffer tank 250 described later through the inflow pipe 255, and is sprayed to the lower area through the nozzle 222 for the fresh water in the buffer tank to flow in, thereby reducing the concentration of the absorbent to a certain level. In this way, the concentration of the absorbent can be adjusted to an optimal level.

[0236] The filler 220 is located at the lower side of the nozzle and the upper side of the storage space 204a, and can absorb the clean water sprayed from the nozzle 222a and flow, thereby extending the residence time and contact area with the exhaust gas, and playing a role in washing the absorbent contained in the exhaust gas to a certain level.

[0237] The storage space 204a is located at the bottom of the post-treatment tower and is also a space for storing absorbent. It is fluidically connected to the storage space 205a of the adjacent regeneration absorption tower 205 through a connecting port 216 formed by opening a portion of the lower end of the partition wall 212.

[0238] In addition, the lower side 217 of the storage space 204a is inclined toward the storage space 205a of the regeneration absorption tower 205, so that the clean water in the storage space 204a can move toward the storage space 205a of the regeneration absorption tower 205, and thereby the diluted absorbent can move toward the adjacent absorption tower or the reference absorption tower through the absorbent outflow pipe 270 of the regeneration absorption tower. Since the absorbent is supplied to the reference absorption tower in a state where the concentration of the absorbent is adjusted to a required level in advance, carbon dioxide can be effectively absorbed in the reference absorption tower.

[0239] The demister 224 can filter the droplets or water vapor of clean water or absorbent contained in the exhaust gas leaving the lower area 204b and move only the exhaust gas after the substances are removed to the upper area 204c, and various well-known technologies can be used.

[0240] The upper area 204 c is an area for removing the absorbent contained in the exhaust gas flowing in from the lower area for the last time, and includes a blocking assembly 230 , a filler 226 , a nozzle 227 , and a demister 228 .

[0241] As an example of the blocking component 230, Fig. 9 The flue tray is shown in the figure. Fig. 9 The blocking component 230 is used to prevent the clean water sprayed from the upper area from falling into the lower area, and includes a through hole 236, a bottom plate 235, a long hole 232 and a chimney 231.

[0242] The bottom plate 235 is provided in a manner of crossing the cross section of the post-treatment tower 204, thereby blocking the clean water falling from the upper area from flowing into the lower area, and a plurality of through holes 236 are formed on the bottom plate 235, which are holes formed on the bottom plate 235 so that the exhaust gas from the lower area can flow into the upper area. The flue 231 is a wall vertically formed around the edge of the through hole 236, in a chimney shape, for defining a long hole 232 for the exhaust gas to flow and a storage space 234 for receiving the dripping clean water. The clean water dripping into the storage space 234 will be collected in the water collection well 233. Not only the above-mentioned structure can be applied, but also various known flue trays can be applied.

[0243] See also Figure 8a The filler 226 is located on the upper side of the blocking component, and can absorb the dripping clean water and retain it for a certain period of time, so that it comes into contact with the rising exhaust gas and uses the clean water to wash the absorbent or its powder contained in the exhaust gas.

[0244] The nozzle 227 is located on the upper side of the filler and is used to spray clean water supplied from the buffer tank described later, and the demister 228 can filter the droplets of clean water or absorbent contained in the exhaust gas leaving the upper area 204c and only discharge the exhaust gas after removing the substances, and a variety of well-known technologies can be used.

[0245] In another embodiment of the present invention, the absorption tower 202 of the present invention may further include a condensation chamber 240 .

[0246] The condensation chamber 240 is connected to the post-treatment tower 204 and is formed in a manner of crossing the entire absorption tower in the horizontal direction. Figure 8a as well as Fig.10 As shown, the condensation chamber 240 is formed long in the longitudinal direction in a tunnel-like form at the upper end of the absorption tower in a manner that simultaneously crosses the reference absorption tower, the regeneration absorption tower, and the post-treatment tower. The moisture contained in the exhaust gas can be condensed by ensuring the time for the exhaust gas to stay on the tunnel, so that only the exhaust gas after the moisture is removed is discharged into the atmosphere and the condensed moisture (hereinafter referred to as condensed water) is recovered into the buffer pipe 250 described later. In addition, the absorbent components that may remain in the exhaust gas can also be recovered at the same time.

[0247] The condensation chamber 240 is defined by an upper side 244, two side surfaces 243, and a lower side surface 241. The upper side surface 244 and the two side surfaces 243 are both parts of the outer shell 201 of the absorption tower, and the lower side surface 241 is a part of the upper side surface of the reference absorption tower 203 and the regeneration absorption tower 205. Therefore, an inner space 245 surrounded by the upper side surface, the lower side surface, and the two side surfaces can be defined, and condensation is achieved by slowing down the movement speed of the exhaust gas in its inner space 245 and increasing the residence time.

[0248] In addition, the lower side surface 241 may further include an inclined surface 241a on one side thereof. The inclined surface 241a is a surface formed by partially inclining the lower side surface, and is connected to the storage tank 250 described later through the recovery pipeline 258, so that the condensed water flows and is easily collected in the buffer tank.

[0249] The condensation chamber 250 is configured to communicate with the outlet 202b of the absorption tower 202, and may further include a demister 242 on the outlet 202b. The demister 242 is the same as the other demisters described above, and is used to filter droplets.

[0250] In another embodiment of the present invention, the absorption part of the carbon dioxide capture device 1 of the present invention may further include a buffer tank 250 .

[0251] like Figure 8a As shown, the buffer tank 250 is a tank body for storing clean water, which is connected to the fluid of the lower area 204b through the inlet pipe 255, connected to the fluid of the upper area 204c through the inlet pipe 253, connected to the fluid of the condensation chamber 240 through the recovery pipe 258, connected to the fluid of the sump 233 of the upper area 204c through the recovery pipe 256, and connected to the fluid of the upper area through the outflow pipe 254.

[0252] The clean water in the buffer tank can be supplied to the lower region 204b by the inflow pipeline 255 connected to the fluid of the outflow pipeline 252 of the buffer tank 250, so that the concentration of the absorbent is adjusted to a certain level. In addition, the clean water in the buffer tank can be supplied to the upper region 204c by the inflow pipeline 253 connected to the fluid of the outflow pipeline 252 of the buffer tank, so that the exhaust gas is washed and the absorbent is recovered. In addition, the clean water applied to the upper region will be collected in the water collection well 233 of the blocking component 230 and returned to the buffer tank 250 through the recovery pipeline 256 connected to the water collection well fluid. Through the outflow pipeline 254 that fluidly connects the upper end of the buffer tank to the upper side of the blocking component 230, the gas (air and water vapor) filled in the buffer tank is discharged to the upper region, so that the clean water can be easily recovered through the recovery pipeline 256. In addition, the buffer tank is also fluidically connected to the condensation chamber 240 via a recovery line 258 , so that the condensed water is recovered into the buffer tank.

[0253] like Figure 8a As shown, in another embodiment of the present invention, the absorption part 200 may further include a filter 264 on the inflow pipe 260 through which the regenerated absorbent flows. The filter 264 may filter foreign matter such as salt contained in the absorbent supplied from the regeneration part, thereby preventing the absorption part from being contaminated by foreign matter in advance.

[0254] like Figure 8a As shown, in another embodiment of the present invention, the absorption unit 200 may further include a cooler 262 on the inflow pipeline 260. The cooler 260 may cool the temperature of the absorbent supplied from the regenerator to a temperature suitable for the absorption reaction, thereby improving the absorption efficiency of carbon dioxide.

[0255] like Figure 8aAs shown, in another embodiment of the present invention, the absorption part 200 may further include a filter 274 on the outflow line 272 for the absorbent in the "rich" state discharged from the basic regeneration unit 203 to flow. Through the filter, foreign matters such as salt contained in the absorbent can be removed before the absorbent is transferred to the regeneration part, thereby preventing the regeneration part from being contaminated or damaged by foreign matters.

[0256] Fig.11 yes Figure 2 Next, we will refer to the schematic diagram of the regeneration unit shown in FIG. Fig.11 The regeneration unit 300 will be described.

[0257] The regeneration unit 300 includes a regeneration tower 301 into which the absorbent flowing from the absorption unit initially flows, and an adjacent regeneration tower 340 that receives the regenerated absorbent from the regeneration tower 301 and regenerates the regenerated absorbent.

[0258] The regeneration tower 340 adjacent to the ecosystem 301 can be as follows Fig.12 As shown, it is composed of a single tower body, or it can be Fig.11 The site shown consists of two independent towers. First, we will refer to Fig.11 The structure consisting of independent tower bodies will be described.

[0259] The regeneration tower 301 includes a shell 303 for defining an internal space 305 for regeneration, and the internal space 305 is equipped with a storage space 304, a primary filler 307, a nozzle 309, a secondary filler 311 and a demister 313 from bottom to top. As described later, unlike the absorption process, since the regeneration reaction is an endothermic reaction, a considerable amount of regeneration energy is consumed. Before the absorbent flows into the regeneration tower 301, it is heated to about 120°C by heat exchange in the heater 310 and then flows into the regeneration tower, so the temperature of the internal space can maintain a high temperature of about 120°C and remove carbon dioxide from the absorbent.

[0260] The nozzle 309 is located on the upper side of the filler and is used to spray the absorbent in a "rich" state.

[0261] The primary filler 307 is located at the lower side of the nozzle 309 and can effectively remove carbon dioxide by adsorbing the fallen absorbent and retaining it for a certain period of time. Because of the high temperature of the absorbent, the primary filler will also maintain a similar temperature to facilitate the removal reaction.

[0262] The secondary filler 311 is located on the upper side of the nozzle 309, and can make the absorbent droplets or water vapor that rise together with the removed carbon dioxide adhere and stay for a certain period of time, thereby removing the carbon dioxide again. In addition, the liquid component will fall downward.

[0263] The demister 313 can filter the water vapor or the droplets of the absorbent from the discharged gases such as carbon dioxide and water vapor and discharge only the gas after the substances are removed, and various well-known technologies can be used.

[0264] The storage space 304 is a space formed at the lower part of the outer shell 303, and is a space for storing the regenerated absorbent that has completed the first carbon dioxide removal. It is connected to the adjacent regeneration tower 340 fluid through the outflow pipe 392, so that the absorbent therein is supplied to the adjacent regeneration tower 340.

[0265] The adjacent regeneration tower 340 may receive the absorbent supplied from the regeneration tower 301 through the outflow line 392 and spray the absorbent from the upper side, thereby removing carbon dioxide from the absorbent.

[0266] like Fig.11 As shown, the regeneration tower 340 is composed of a removal area 340a for regenerating the supplied absorbent and a storage area 340b for recovering and storing the regenerated absorbent.

[0267] The removal area 340 a includes a blocking component 350 , a primary filler 347 , a secondary filler 348 , and a nozzle 346 .

[0268] The nozzle 346 is a structure for spraying the absorbent supplied through the outflow pipe 392. As described later, a considerable amount of regeneration energy is consumed in the process of removing carbon dioxide in the regeneration tower 301, so the absorbent stored in the storage area 304 of the regeneration tower 301 is in a state of slightly lowered temperature (about 105-110°C), and is heated to about 120°C by equipping the outflow pipe with a heater 380.

[0269] The primary filler 347 and the secondary filler 348 are located at the lower side of the nozzle 346, and can effectively remove carbon dioxide by adsorbing the fallen absorbent and retaining it for a certain period of time. Because of the high temperature of the absorbent, these fillers will also maintain a similar temperature to facilitate the removal reaction.

[0270] Since the blocking assembly 350 adopts the same structure as the flue tray of the absorption tower described above, detailed description thereof will be omitted. Although the absorbent collected in the blocking assembly is the absorbent that has completed regeneration to a certain extent, in order to perform the regeneration process again by the heating boiler 360 described later, the absorbent collected in the blocking assembly is transferred to the heating boiler 360.

[0271] In addition, gases such as carbon dioxide and water vapor separated from the removal area will be supplied to the regeneration tower 301 through a flow pipe 335 whose one end is fluidly connected to the upper side of the removal area 340a and the other end is fluidly connected to the lower side of the regeneration tower 301, so that they can flow to the upper side while being removed again.

[0272] The storage area 340 b and the removal area 340 a are configured to allow the flow of carbon dioxide but not allow the absorbent in the removal area to flow directly, and include a storage space 344 for receiving the absorbent from the heating boiler 360 and storing it.

[0273] Since the absorbent stored in the storage area 340b is in a state where regeneration has been completed, it is maintained in the most "lean" state and is fluidly connected to the absorption part, i.e., the reference absorption tower, through the outflow line 390. The outflow line 390 is only for the convenience of explanation from the perspective of the regeneration tower. Figure 8a The names of the inflow pipes 260 shown in the figure are defined as the flow paths in which the same absorbent flows.

[0274] In another embodiment of the present invention, the regeneration unit 300 may further include a heater 380 and a heating boiler 360 .

[0275] A steam boiler 370 for generating steam is installed in a ship for various purposes. The present invention supplies steam generated by the steam boiler as described above to the heating boiler 360, thereby heating the absorbent recovered to the heating boiler using the heat energy of the steam and removing carbon dioxide, and further supplies the combustion gas discharged from the steam boiler 370 to the heater 380 to perform heat exchange with the absorbent passing through the heater and thereby increase the temperature of the absorbent.

[0276] The heater 380 is a heat exchanger installed at the intersection of the outflow pipe 376 through which the combustion gas of the steam boiler 370 is discharged and the outflow pipe 392 through which the regenerated absorbent discharged from the regeneration tower 301 flows. The temperature of the absorbent is raised to a level required for the removal reaction in the adjacent regeneration tower by heat exchange between the combustion gas of the steam boiler 370 having high thermal energy and the absorbent. Since the temperature of the absorbent is raised by using the thermal energy of the combustion gas of the steam boiler 370 commonly used in ships, no additional regeneration energy is required, thereby improving energy efficiency.

[0277] In addition, the heating boiler 360 receives high-temperature steam generated in the steam boiler 370 through the inflow line 372 and performs heat exchange with the steam after the absorbent in the removal area 340a is recovered through the recovery line 364, thereby removing carbon dioxide from the absorbent again. The steam used in the heat exchange can be returned to the steam boiler 370 system of the ship through the outflow line 372.

[0278] The heating boiler 360 supplies the removed carbon dioxide and water vapor and other gases to the removal area 340a through the fluid pipeline 362 on the upper side connected to the removal area 340a fluid, and supplies the absorbent after the carbon dioxide is removed to the storage area 340b through the outflow pipeline 366 connected to the storage area 340b fluid. Therefore, the absorbent stored in the storage area is the absorbent in the most "lean" state after regeneration.

[0279] In another embodiment of the present invention, the regeneration section 300 may further include a heater 310. The heater 310 is a heat exchanger provided at a position where an outflow pipe 390 connected to the fluid of the storage space 344 of the regeneration tower 340 and an outflow pipe 272 connected to the fluid of the storage space 203a of the reference absorption tower of the absorption section intersect. Because the temperature of the absorbent discharged from the regeneration tower 340 is about 120°C, which is in an extremely high temperature state, while on the contrary, the temperature of the absorbent transferred from the absorption section is about 35-40°C. The heater 310 heats the two fluids to raise the temperature of the absorbent to the temperature range required for removing carbon dioxide in the regeneration tower.

[0280] In another embodiment of the present invention, the regeneration unit 300 may further include a heater 330 and a gas-liquid separator 320 .

[0281] The heater 330 is a heater arranged at a position where the outflow pipeline, which is connected to the upper end fluid of the regeneration tower 301 at one end and connected to the gas-liquid separator at the other end, intersects with the outflow pipeline 116 and the inflow pipeline 111 of the clean water of the pre-treatment unit 100. The gas in the outflow pipeline 315 is the removed carbon dioxide and water vapor, and the temperature is about 90°C, which is in an extremely high temperature state. On the contrary, the temperature of the clean water is about -2 to 15°C in winter, which is in an extremely low temperature state. Therefore, the temperature of the clean water can be increased by heat exchanging the gas in the high-temperature outflow pipeline 315 with the low-temperature clean water, and then provided to the pre-treatment tower 101. Even if no separate energy is provided, the temperature of the exhaust gas can be increased to the temperature range required for the absorption reaction in the pre-treatment unit by using the waste energy, thereby improving the absorption efficiency in the absorption unit. On the contrary, in the gas containing carbon dioxide and water vapor discharged from the upper end of the regeneration tower 301, the water vapor will be condensed by heat exchange and flow into the gas-liquid separator at the lower side. Because of the reasons described above, from the side of the regeneration tower, the heater can also be called a condenser.

[0282] The gas-liquid separator 320 can separate the condensed water formed by the condensation of water vapor from the carbon dioxide and transfer the carbon dioxide to a post-processing process such as a liquefaction process, while the condensed water will flow into the regeneration tower 301 through the outflow pipeline 322 for treatment.

[0283] Fig.12 FIG. 4 is a schematic diagram of a regeneration unit of a carbon dioxide capture device according to another embodiment of the present invention. Fig.12 The regeneration unit 400 shown in the figure is connected to the two regeneration towers through the flow pipeline 335 Fig.11 The difference is that the regeneration unit shown in the figure is only composed of one tower body. For the same structure, only the first digit in the figure number is changed to "4" for marking, so the structures with the same last few digits should be understood to perform the same function.

[0284] Fig.11 The regeneration tower 301 and the adjacent regeneration tower 340 are Fig.12 The regeneration tower 401 and the adjacent regeneration tower 440 have the same structure.

[0285] See also Fig.12 The absorbent in a "rich" state for absorbing carbon dioxide will flow into the upper regeneration tower 401 which is fluidically connected to the outflow pipeline 272 of the absorption section.

[0286] The upper regeneration tower 401 includes a shell 403 for defining an internal space 405 for regeneration, and the internal space 405 is equipped with a storage space 404, a primary filler 407, a nozzle 409 and a secondary filler 411 from bottom to top. The nozzle 409 is located on the upper side of the filler and is used to spray the absorbent in a "rich" state.

[0287] The primary filler 407 is located at the lower side of the nozzle 409 and can effectively remove carbon dioxide by adsorbing the fallen absorbent and retaining it for a certain period of time. Because of the high temperature of the absorbent, the primary filler will also maintain a similar temperature to facilitate the removal reaction.

[0288] The secondary filler 411 is located on the upper side of the nozzle 409, and can make the absorbent droplets or water vapor that rise together with the removed carbon dioxide adhere and stay for a certain period of time, thereby removing the carbon dioxide again. In addition, the liquid component will fall downward.

[0289] The storage space 404 is formed at the bottom of the housing 403 and is used to store the regenerated absorbent after the first carbon dioxide removal. The storage space 404 is connected to the lower regeneration tower 440 through the outflow line 492, so that the absorbent therein is supplied to the lower regeneration tower 440. Fig.11 Unlike the embodiment in the embodiment, this embodiment includes a blocking component 404a for blocking the absorbent stored in the storage space 404 from flowing into the lower absorption tower 440. The blocking component 404a adopts the same structure as the flue tray as described above. In addition, this embodiment also includes a buffer tank 404b. The buffer tank 404b recovers the absorbent stored in the storage space through a recovery pipeline 404c that is connected to the storage space 404 fluid at one end and connected to the buffer tank 404b fluid at the other end. In addition, the buffer tank 404b supplies the absorbent to the removal area 440a and regenerates it through an outflow pipeline 492 that is connected to the buffer tank fluid at one end and connected to the removal area 440a of the lower regeneration tower 440 at the other end. In addition, the buffer tank 404b can discharge carbon dioxide or water vapor into the regeneration tower 401 through an outflow pipeline 404d that is connected to the buffer tank fluid at one end of the upper side and connected to the upper side of the storage space 404 of the upper regeneration tower 401 at the other end.

[0290] The lower regeneration tower 440 may receive the absorbent supplied from the regeneration tower 401 through the outflow line 492 and spray the absorbent from the upper side, thereby removing carbon dioxide from the absorbent.

[0291] like Fig.12As shown, the regeneration tower 440 is composed of a removal area 440a for regenerating the supplied absorbent and a storage area 440b for recovering and storing the regenerated absorbent.

[0292] The removal area 440 a includes a blocking component 450 , a primary filler 447 , a secondary filler 448 and a nozzle 446 .

[0293] The nozzle 446 is a structure for spraying the absorbent supplied through the outflow pipe 492. As described later, a considerable amount of regeneration energy is consumed in the process of removing carbon dioxide in the regeneration tower 401, so the absorbent stored in the storage area 404 of the regeneration tower 401 is in a state of slightly lowered temperature (about 105-110°C), and is heated to about 120°C by equipping the outflow pipe 492 with a heater 480.

[0294] The primary filler 447 and the secondary filler 448 are located at the lower side of the nozzle 446, and can effectively remove carbon dioxide by adsorbing the fallen absorbent and retaining it for a certain period of time. Because of the high temperature of the absorbent, these fillers will also maintain a similar temperature to facilitate the removal reaction.

[0295] Since the blocking assembly 450 adopts the same structure as the flue tray of the absorption tower described above, detailed description thereof will be omitted. Although the absorbent collected in the blocking assembly is the absorbent that has completed regeneration to a certain extent, in order to perform the regeneration process again by the heating boiler 460 described later, the absorbent collected in the blocking assembly is transferred to the heating boiler 460.

[0296] In addition, the gases such as carbon dioxide and water vapor separated from the removal area are supplied to the upper regeneration tower 401 through the blocking component 404a and flow to the upper side while being removed again.

[0297] The storage area 440 b and the removal area 440 a are configured to allow the flow of carbon dioxide but not allow the absorbent in the removal area to flow directly, and include a storage space 444 for receiving the absorbent from the heating boiler 460 and storing it.

[0298] Since the absorbent stored in the storage area 440 b is in a state where regeneration has been completed, it maintains a most “lean” state and is fluidly connected to the absorption part, ie, the reference absorption tower, through the outflow line 390 .

[0299] The heater 480, the heating boiler 460 and the steam boiler 470 are Fig.11The configuration of the embodiments shown in the figure is the same, so the detailed description thereof will be omitted.

[0300] Figures 13 to 21 The schematic diagram is a diagram showing the schematic layout of different embodiments of the present invention using different combinations of pre-treatment units, absorption units, and regeneration units. Although only a schematic layout is shown, the above-mentioned configuration is still included.

[0301] exist Fig.13 1 shows a carbon dioxide capture device composed of a pre-treatment unit 101, an absorption tower 202, and a regeneration unit 300. Therefore, the exhaust gas discharged from the pre-treatment unit will be discharged into the atmosphere after absorbing carbon dioxide in an absorption tower 202, and the absorbent after absorbing carbon dioxide will be supplied to the regeneration unit and flow back into the absorption unit after performing the carbon dioxide removal process.

[0302] In another embodiment of the present invention, Fig.14 As shown, a carbon dioxide capture device consisting of a pre-treatment unit 101, an absorption tower 202, a post-treatment tower 204 and a regeneration unit may be used. The carbon dioxide capture device allows the exhaust gas from the pre-treatment unit to flow into an absorption tower and remove carbon dioxide, and then removes the droplets or moisture of the absorbent in a post-treatment tower, and then transfers the absorbent to the regeneration unit for regeneration before flowing into the absorption tower.

[0303] In another embodiment of the present invention, Fig.15 As shown, a carbon dioxide capture device consisting of a pre-treatment unit, three absorption towers 203, 213, 205, a post-treatment tower 204, and a regeneration unit 300 may be used. The exhaust gas discharged from the pre-treatment unit will flow 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 will be provided in the order of the regeneration absorption tower 205, the middle absorption tower 213, and the reference absorption tower 203.

[0304] In another embodiment of the present invention, Fig.16 As shown, a carbon dioxide capture device consisting of two absorption towers 203 and 205, a post-treatment tower 204 and a regeneration unit 300 may be provided.

[0305] In another embodiment of the present invention, Fig.17 As shown, a carbon dioxide capture device consisting of three absorption towers 203, 213, 205, one post-treatment tower 204 and a regeneration unit 300 may be used.

[0306] In another embodiment of the present invention, Fig.18As shown, a carbon dioxide capture device consisting of four absorption towers 203, 214, 213, 205, a post-treatment tower 204, and a regeneration unit 300 may be used. The exhaust gas will flow 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 will be provided in the order of the regeneration absorption tower 205, the absorption tower 213, the absorption tower 214, and the reference absorption tower 203.

[0307] In another embodiment of the present invention, Fig.19 As shown, a carbon dioxide capture device consisting of two absorption towers 203 and 205 and a regeneration unit 300 may be provided.

[0308] In another embodiment of the present invention, Fig. 20 As shown, a carbon dioxide capture device consisting of three absorption towers 203, 213, 205 and a regeneration unit 300 may be used.

[0309] In another embodiment of the present invention, Fig.21 As shown, a carbon dioxide capture device consisting of four absorption towers 203, 214, 213, 205 and a regeneration unit 300 may be used.

Claims

1. A carbon dioxide capture device, A carbon dioxide capture device comprising an absorption section for absorbing carbon dioxide in at least a part of exhaust gas taken out from a scrubber and a regeneration section for regenerating an absorbent discharged from the absorption section, A pre-treatment section is further included between the scrubber and the absorption section. The exhaust gas taken out from the scrubber flows into the pre-treatment section and flows into the absorption section after being adjusted to a certain temperature required by the absorption section.

2. The carbon dioxide capture device according to claim 1, The pre-treatment unit raises the temperature of the liquid in the heater of the regeneration unit to the temperature of the exhaust gas by heat exchange with the exhaust gas.

3. The carbon dioxide capture device according to claim 2, include: The pretreatment tower is constructed in a manner connected to an inlet pipe for allowing liquid discharged from the heater of the regeneration section to flow in, an inlet pipe for allowing a portion of the exhaust gas taken out from the scrubber to flow in, an outflow pipe for allowing the liquid discharged from the pretreatment section to flow out, and an outflow pipe for allowing the exhaust gas to flow out.

4. The carbon dioxide capture device according to claim 3, The exhaust gas outflow conduit of the pre-treatment unit is configured to communicate with the absorption unit, and a blower is provided on the exhaust gas outflow conduit to forcibly supply the exhaust gas of the pre-treatment unit to the absorption unit.

5. The carbon dioxide capture device according to claim 2, The pre-treatment unit further includes a nozzle for spraying the liquid flowing into the heater of the pre-treatment unit toward the exhaust gas, so that the temperature of the exhaust gas is increased by contact between the liquid sprayed from the nozzle and the exhaust gas.

6. The carbon dioxide capture device according to claim 3, The liquid outflow pipeline and the liquid inflow pipeline are connected to the heater fluid of the regeneration unit to form a closed loop, so that the liquid flowing into the pre-treatment unit repeatedly returns to the heater.

7. The carbon dioxide capture device according to claim 6, The outflow pipeline of the liquid also includes a heat exchanger, so that the temperature of the liquid is cooled to a certain temperature through heat exchange between seawater and the liquid in the heat exchanger and then flows into the heater.

8. A carbon dioxide capture device according to any one of claims 2 to 7, A storage space for storing the liquid is included at the lower part of the pretreatment tower, one end of the exhaust gas outflow pipeline is located on the upper side of the storage space, and one end of the liquid outflow pipeline is fluidically connected to the storage space.

9. The carbon dioxide capture device according to claim 8, A water treatment unit is further included, which is configured to form a closed circuit with the storage space, and supplies filtered liquid to the heater after removing foreign matter contained in the liquid stored in the storage space.

10. The carbon dioxide capture device according to claim 3 to claim 7, The pre-treatment tower and the scrubber are integrally formed.

11. A carbon dioxide capture device according to any one of claims 2 to 7, The absorption tower is formed in a hexahedral shape whose planar cross section and side cross section are any shape selected from the group consisting of a square or a rectangular shape.

12. The carbon dioxide capture device according to claim 11, The absorption tower includes at least two absorption towers, and the two absorption towers are arranged continuously in the horizontal direction and are connected to each other so that the exhaust gas flowing in can flow.

13. The carbon dioxide capture device according to claim 11, The absorption part further includes a post-treatment tower connected to the absorption tower at the rear end of the absorption tower, and the exhaust gas flowing out of the absorption tower will flow into the post-treatment tower to remove the droplets or moisture of the absorbent contained in the exhaust gas.

14. The carbon dioxide capture device according to claim 13, A condensation chamber is further provided at the end of the post-treatment tower, which can retain the exhausted gas for a certain period of time. The condensation chamber is a hexahedral space formed in the horizontal direction across the absorption tower and the upper part of the post-treatment tower.

15. The carbon dioxide capture device according to claim 11, The regeneration section includes a regeneration tower into which the absorbent discharged from the absorption section can initially flow, and another regeneration tower into which the absorbent discharged from the regeneration tower can flow.

16. The carbon dioxide capture device according to claim 15, The other regeneration tower is fluidly connected to the regeneration tower into which the absorbent initially flows, so 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 initially flows, and an outflow pipeline through which the absorbent discharged from the regeneration tower into which the absorbent discharged from the absorption section initially flows is fluidly connected to the other regeneration tower, and a heater is included on the outflow pipeline, and the temperature of the absorbent is increased by heat exchange between the combustion gas of the steam boiler and the absorbent.

17. The carbon dioxide capture device according to claim 16, The other regeneration tower is composed of a removal area for removing carbon dioxide from the absorbent by coating the absorbent discharged from the regeneration tower into which the absorbent discharged from the absorption section initially flows, and a storage area for recovering and storing the absorbent from which carbon dioxide has been removed, and the storage area is fluidly connected to the absorption section. It also includes a heating boiler that is fluidly connected to the storage area and the removal area and supplies a gas containing carbon dioxide to the removal area and resupplying the absorbent to the storage area after recovering and reheating the absorbent discharged from the removal area, and the heating boiler performs heat exchange between the steam generated by the steam boiler and the absorbent recovered from the removal area.

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