Carbon dioxide capture device and the controlling method thereof

Abstract

A CO2 capture device is disclosed. The CO2 capture device comprises: a control valve for distributing the flow rate of exhaust gas; a first line that captures CO2 using a low-temperature adsorbent when exhaust gas is introduced; a heat exchanger installed upstream of the first line to maintain the introduced exhaust gas at a preset temperature; a second line that captures CO2 using a medium-temperature adsorbent when exhaust gas is introduced; a bypass line that passes the exhaust gas without capturing CO2 when exhaust gas is introduced; a sensor unit for sensing the flow rate and temperature of the exhaust gas of each of the first line and the second line; and a processor that controls the control valve based on the flow rate and temperature of the exhaust gas of each of the first line and the second line sensed through the sensor unit to distribute the flow rate of the exhaust gas to at least one of the first line, the second line, and the bypass line. Accordingly, by using low-temperature and medium-temperature adsorbents in the CO2 capture device to appropriately distribute the flow rate and temperature of the incoming exhaust gas, CO2 capture is operated more efficiently, and by controlling the exhaust gas temperature according to the performance characteristics of the adsorbent, the efficiency of the adsorbent is maximized, thereby increasing CO2 capture efficiency and enhancing durability.

Description

Technology Field

[0001] The present invention relates to a CO2 capture device and a control method thereof, and more specifically, to a CO2 capture device and a control method thereof that configures low-temperature adsorbents and medium-temperature adsorbents used in small and medium-sized vessels in different lines and controls the distribution of exhaust gas flow rates. Background Technology

[0002] Conventional CO2 capture technologies have structures that perform CO2 capture using a single low-temperature adsorbent, a single medium-temperature adsorbent, or both a low-temperature adsorbent and a medium-temperature adsorbent.

[0003] In this case, when using a single adsorbent, the temperature of the adsorbent must be maintained according to the ship's operating environment, and since the entire exhaust gas flow is passed through at once, the volume of the single adsorbent in the heat exchanger inevitably increases.

[0004] In addition, due to the temperature-dependent operating range of the adsorbent, effective adsorption performance is difficult to expect under conditions outside the adsorbent's operating range, as the entire exhaust gas flow is bypassed.

[0005] On the other hand, when low-temperature and medium-temperature adsorbents are used together, the problem of limited operating ranges for each temperature is resolved, and adsorption performance over a wide operating environment is expected; however, there is still a problem in that the entire exhaust gas flow rate must be bypassed under conditions outside the adsorbent's operating range.

[0006] In addition, when low-temperature and medium-temperature adsorbents are used simultaneously, exposure to abnormal temperatures can have an adverse effect on the durability lifespan of the adsorbents.

[0007] Accordingly, there has been an increasing need to improve the adsorption efficiency of CO2 capture devices used in small and medium-sized vessels by distributing the flow rate and temperature of the exhaust gas according to the characteristics of the adsorbent. The problem to be solved

[0008] The objective of the present invention is to provide a CO2 capture device and a control method thereof for increasing adsorption efficiency by configuring low-temperature and medium-temperature adsorbents used in small and medium-sized vessels into different lines and distributing the flow rate of exhaust gas flowing into the low-temperature and medium-temperature adsorbents. means of solving the problem

[0009] A CO2 capture device according to one embodiment of the present invention for achieving the above purpose comprises: a control valve for distributing the flow rate of exhaust gas; a first line for capturing CO2 using a low-temperature adsorbent when the exhaust gas is introduced; a heat exchanger installed upstream of the first line to maintain the introduced exhaust gas at a preset temperature; a second line for capturing CO2 using a medium-temperature adsorbent when the exhaust gas is introduced; a bypass line for passing the exhaust gas without capturing CO2 when the exhaust gas is introduced; a sensor unit for sensing the flow rate and temperature of the exhaust gas of each of the first line and the second line; and a processor for controlling the control valve based on the flow rate and temperature of the exhaust gas of each of the first line and the second line sensed through the sensor unit to distribute the flow rate of the exhaust gas to at least one of the first line, the second line, and the bypass line.

[0010] In addition, a CO2 capture device according to one embodiment of the present invention further includes a reduction unit for reducing particulate matter and nitrogen oxides at the front end of the CO2 capture device and a nitrogen oxide sensor unit disposed at the front and rear ends of the CO2 capture device for sensing nitrogen oxides.

[0011] In addition, the processor can calculate and monitor nitrogen oxide efficiency based on the sensed upstream and downstream nitrogen oxides.

[0012] Additionally, the processor may control the control valve to distribute a portion of the exhaust gas flow rate to the first line if the temperature of the exhaust gas is lower than the preset temperature based on the exhaust gas flow rate and temperature of each of the sensed first line and second line, and control the control valve to distribute the remaining exhaust gas flow rate to the bypass line based on the exhaust gas flow rate and temperature distributed to the first line.

[0013] Additionally, the processor can control the control valve to maintain a portion of the exhaust gas flow rate at the preset temperature through the heat exchanger and distribute the exhaust gas flow rate maintained at the preset temperature to the first line based on the sensed exhaust gas flow rate and temperature of each of the first and second lines if the temperature of the exhaust gas is higher than the preset temperature, and to distribute a portion of the remaining exhaust gas flow rate to the second line based on the exhaust gas flow rate and temperature distributed to each of the first and second lines.

[0014] Additionally, the processor can control the control valve to distribute the flow rate of the exhaust gas to the first line, the second line, and the bypass line based on at least one of the calculated nitrogen oxide efficiency and the sensed exhaust gas flow rate and temperature of each of the first line and the second line.

[0015] Meanwhile, a control method for a CO2 capture device according to one embodiment of the present invention comprises the steps of: sensing the flow rate and temperature of an exhaust gas for each of a first line that captures CO2 using a low-temperature adsorbent and a second line that captures CO2 using a medium-temperature adsorbent; distributing the flow rate of the exhaust gas to at least one of the first line and the second line based on the sensed flow rate and temperature of the exhaust gas for each of the first line and the second line; and distributing the remaining flow rate of the exhaust gas to a bypass line based on the flow rate and temperature of the exhaust gas distributed to at least one of the first line and the second line. Effects of the invention

[0016] According to various embodiments of the present invention as described above, by appropriately distributing the flow rate and temperature of the incoming exhaust gas using low-temperature and medium-temperature adsorbents used in a CO2 capture device, CO2 capture is operated more efficiently, and the exhaust gas temperature is controlled to match the performance characteristics of the adsorbent, thereby maximizing the efficiency of the adsorbent, increasing CO2 capture efficiency, and enhancing durability. Brief explanation of the drawing

[0017] FIG. 1 is a block diagram illustrating the configuration of a CO2 capture device according to one embodiment of the present invention. FIG. 2 is a block diagram illustrating the configuration of a CO2 capture device for reducing particulate matter and nitrogen oxides according to one embodiment of the present invention. FIG. 3 is a diagram illustrating the operation process of a CO2 capture device according to an embodiment of the present invention. FIGS. 4 to 6 are drawings for explaining the process of controlling a control valve based on efficiency verification through nitrogen oxide monitoring according to one embodiment of the present invention. FIG. 7 is a flowchart illustrating a control method for a CO2 capture device according to one embodiment of the present invention. FIG. 8 is a block diagram showing the specific configuration of the CO2 capture device illustrated in FIG. 2. FIG. 9 is a drawing relating to a software module stored in a storage unit according to an embodiment of the present invention. Specific details for implementing the invention

[0018] The present invention will be described in more detail below with reference to the drawings. Furthermore, in describing the present invention, specific descriptions of related known functions or configurations are omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. Additionally, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or relationships of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0019] FIG. 1 is a block diagram illustrating the configuration of a CO2 capture device according to one embodiment of the present invention.

[0020] Referring to FIG. 1, a CO2 capture device (100) according to one embodiment of the present invention includes a control valve (110), a heat exchanger (120), a first line (130), a second line (140), a bypass line (150), a sensor unit (160), and a processor (170).

[0021] Here, a CO2 capture device according to one embodiment of the present invention relates to a CO2 capture device used in small and medium-sized vessels, and can be used to reduce greenhouse gases in the vessel.

[0022] Additionally, the control valve (110) can distribute the flow rate of the exhaust gas, and the first line (130) can capture CO2 using a low-temperature adsorbent when the exhaust gas is introduced, and the heat exchanger (120) can be installed upstream of the first line (130) to maintain the introduced exhaust gas at a preset temperature.

[0023] Additionally, the second line (140) can capture CO2 using a medium-temperature adsorbent when exhaust gas is introduced, and the bypass line (150) can pass CO2 without capturing it, unlike the first line (130) and the second line (140).

[0024] Additionally, the sensor unit (160) senses the exhaust gas flow rate and temperature of each of the first line (130) and the second line (140), and the processor (170) controls the control valve (110) based on the exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) sensed through the sensor unit (160) to distribute the exhaust gas flow rate to at least one of the first line (130), the second line (140), and the bypass line (150).

[0025] Specifically, the processor (170) senses the flow rate and temperature of the exhaust gas in each of the first line (130) and the second line (140), checks whether the temperature of the exhaust gas flowing in each of the first line (130) and the second line (140) is lower or higher than a preset temperature, and if it is lower than the preset temperature, controls the control valve (110) to distribute the flow rate of the exhaust gas to the first line (130) which captures CO2 using a low-temperature adsorbent, and at this time, controls the control valve (110) to close so that almost no flow rate of the exhaust gas is distributed to the second line (140) which contains a medium-temperature adsorbent, since it is not in the operating range.

[0026] And, the processor (170) can control the control valve (110) so that the remaining flow of exhaust gas flows to the bypass line (150) if the flow rate, temperature, and back pressure characteristics of the exhaust gas flowing in the first line (130) are above a certain standard.

[0027] Meanwhile, the processor (170) can control the control valve (110) so that if the temperature of the exhaust gas flowing through each of the first line (130) and the second line (140) is higher than the preset temperature but within a certain range, the exhaust gas flows through the heat exchanger (120) placed at the front end of the first line (130) to maintain the preset temperature, thereby capturing CO2 using a low-temperature adsorbent, and if the temperature of the exhaust gas flowing through each of the first line (130) and the second line (140) rises above the preset temperature but within a certain range, it flows through the second line (140) to capture CO2 using a medium-temperature adsorbent.

[0028] And, the processor (170) can control the control valve (110) to allow the remaining flow of exhaust gas to flow to the bypass line (150) if the flow rate, temperature, and back pressure characteristics of the exhaust gas flowing in the first line (130) and the second line (140) are above a certain standard.

[0029] FIG. 2 is a block diagram illustrating the configuration of a CO2 capture device for reducing particulate matter and nitrogen oxides according to one embodiment of the present invention.

[0030] Referring to FIG. 2, a CO2 capture device (100) according to one embodiment of the present invention may further include a reduction unit (180) for reducing particulate matter and nitrogen oxides at the front end of the CO2 capture device (100) and a nitrogen oxide sensor unit (190) for sensing nitrogen oxides, which is positioned at the front and rear ends of the CO2 capture device (100).

[0031] Here, particulate matter refers to suspended matter of very small liquid or solid matter, and if such particulate matter and nitrogen oxides are introduced into the first line (130) or second line (140) for CO2 capture, it reduces the CO2 capture efficiency.

[0032] Accordingly, a reduction unit (180) is installed at the front end of the CO2 capture device (100) to perform the function of filtering and reducing such particulate matter or nitrogen oxides, and a nitrogen oxide sensor unit (190) is positioned at the front and rear ends of the CO2 capture device (100) to sense nitrogen oxides at the front end and nitrogen oxides at the rear end, and a processor (170) can calculate and monitor nitrogen oxide efficiency based on the sensed nitrogen oxides at the front and rear ends.

[0033] FIG. 3 is a diagram illustrating the operation process of a CO2 capture device according to an embodiment of the present invention.

[0034] Referring to FIG. 3, an operation (DePM, DeNOx) (210) to reduce particulate matter or nitrogen oxides present in the exhaust gas can be performed by means of a reduction unit (180) at the front end of the CO2 capture device (100).

[0035] And, the processor (170) can control the control valve (110) to distribute a portion of the exhaust gas flow to the first line (130) based on the sensed exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) if the temperature of the exhaust gas is lower than a preset temperature, and control the control valve (110) to distribute the remaining exhaust gas flow to the bypass line (150) based on the exhaust gas flow rate and temperature distributed to the first line (130).

[0036] That is, in FIG. 3, based on the exhaust gas flow rate and temperature (21, 22) (Feedback Control) of each of the first line (130) and second line (140) sensed, if the temperature of the exhaust gas is lower than the preset temperature, the control valve (220) operates to distribute a portion (Q1) (230) of the exhaust gas flow rate to the first line (130) and to capture CO2 through the heat exchanger (260) and the low-temperature adsorbent (270). At this time, based on the flow rate and temperature (21, 22) of the exhaust gas distributed to the first line (130), the control valve (220) operates to distribute the remaining flow rate (Q3) (250) of the exhaust gas to the bypass line (150) by considering the temperature and back pressure characteristics of the exhaust gas distributed to the first line (130).

[0037] Meanwhile, the processor (170) can maintain a portion of the exhaust gas flow rate at a preset temperature through a heat exchanger (120) and distribute the exhaust gas flow rate maintained at the preset temperature to the first line (130) based on the sensed exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) if the temperature of the exhaust gas is higher than a preset temperature, and also distribute a portion of the exhaust gas flow rate maintained at the preset temperature to the first line (130). Additionally, the processor (170) can distribute a portion of the remaining exhaust gas flow rate to the second line (140) based on the exhaust gas flow rate and temperature distributed to each of the first line (130) and the second line (140), and also control the control valve (110) to distribute a remaining portion of the remaining exhaust gas flow rate to the bypass line (150) based on the exhaust gas flow rate and temperature distributed to each of the first line (130) and the second line (140).

[0038] That is, based on the exhaust gas flow rate and temperature (21, 22) of the first line (130) and the second line (140) sensed in FIG. 3, if the temperature of the exhaust gas is higher than the preset temperature, a portion (Q1) (230) of the exhaust gas flow rate is maintained at the preset temperature through the heat exchanger (260), and the control valve (220) is operated to distribute the exhaust gas flow rate maintained at the preset temperature to the first line (130) and capture CO2 through the low-temperature adsorbent (270) via the heat exchanger (260). If the temperature of a portion (Q1) (230) of the exhaust gas flow rate becomes higher or the flow rate becomes greater, thereby exceeding the heat treatment range of the heat exchanger (260), a portion (Q2) (240) of the remaining exhaust gas flow rate is distributed to the second line (140) and capture CO2 through the medium-temperature adsorbent (280). The control valve (220) is operated.

[0039] In addition, at this time, the control valve (220) is operated to distribute the remaining flow rate (Q3) (250) of the remaining flow rate of exhaust gas to the bypass line (150) by considering the temperature and back pressure characteristics of the exhaust gas distributed to the first line (130) and the second line (140) based on the flow rate and temperature (21, 22) of the exhaust gas distributed to the first line (130) and the second line (140).

[0040] Meanwhile, the processor (170) can control the control valve (110) to distribute the flow rate of exhaust gas to the first line (130), the second line (140), and the bypass line (150) based on at least one of the calculated nitrogen oxide efficiency and the sensed exhaust gas flow rate and temperature of each of the first line (130) and the second line (140).

[0041] FIGS. 4 to 6 are drawings for explaining the process of controlling a control valve based on efficiency verification through nitrogen oxide monitoring according to one embodiment of the present invention.

[0042] Referring to FIG. 4, the process of driving a control valve based on nitrogen oxide efficiency verification is described, specifically, a step of efficiency verification through nitrogen oxide monitoring (S310) and a step (S320) of driving the control valve (110) based on this and controlling the reduction unit (180) that reduces nitrogen oxides are illustrated.

[0043] Additionally, referring to FIG. 5, a nitrogen oxide reduction control process is described and specifically includes a step (S410) of checking whether the SCR (Silicon Controlled Rectifier) ​​control start temperature is reached, a step (S420) of performing SCR control based on the sensing values ​​through the nitrogen oxide sensor unit (190), air volume sensor, and temperature sensor when the SCR control start temperature is reached, and a step (S430) of calculating and monitoring the nitrogen oxide efficiency based on the nitrogen oxides at the front and rear ends of the CO2 capture device (100).

[0044] Additionally, referring to FIG. 6, the control operation process of the control valve (110) based on the calculated nitrogen oxide efficiency is described, and specifically includes a step (S510) in which the nitrogen oxide efficiency is calculated, and a first distribution step (S520) in which the valve for the first line (130) and the valve for the bypass line (150) are controlled based on the calculated nitrogen oxide and the sensing value obtained through at least one temperature and pressure sensor among the first line (130) and the second line (140) to distribute the exhaust gas flow rate.

[0045] And, after distribution, if it goes out of the control temperature range after the step (S520) of sensing whether it is within the control temperature range, it can be maintained at a preset temperature through a heat exchanger and then distributed again to the first line (130).

[0046] Additionally, the method includes a second distribution step (S550) for distributing the exhaust gas flow rate by controlling the valve for the second line (140) and the valve for the bypass line (150) after sensing whether the distribution control temperature and back pressure range are exceeded more significantly (S540), a step (S560) for sensing whether the control temperature and back pressure range are still exceeded more significantly after the second distribution, and a step (S570) for bypassing all remaining exhaust gas flow rates by controlling the valve for the bypass line (150).

[0047] As described above, the processor (170) can distribute the exhaust gas flow to the first line (130), the second line (140), and the bypass line based on at least one of the calculated nitrogen oxide efficiency and the sensed exhaust gas flow rate and temperature of each of the first line (130) and the second line (140).

[0048] FIG. 7 is a flowchart illustrating a control method for a CO2 capture device according to one embodiment of the present invention.

[0049] Referring to FIG. 7, a control method for a CO2 capture device according to one embodiment of the present invention includes the step of sensing the flow rate and temperature of a first line that captures CO2 using a low-temperature adsorbent and a second line that captures CO2 using a medium-temperature adsorbent (S610); the step of distributing the flow rate of the exhaust gas to at least one of the first line and the second line based on the sensed flow rate and temperature of the exhaust gas to each of the first line and the second line (S620); and the step of distributing the remaining flow rate of the exhaust gas to a bypass line based on the flow rate and temperature of the exhaust gas distributed to at least one of the first line and the second line (S630).

[0050] In addition, all operation processes of the processor (170) as described above may be included in the control method of the CO2 capture device according to one embodiment of the present invention.

[0051] FIG. 8 is a block diagram showing the specific configuration of the CO2 capture device illustrated in FIG. 2.

[0052] Referring to FIG. 8, the CO2 capture device (100) includes a control valve (110), a heat exchanger (120), a first line (130), a second line (140), a bypass line (150), a sensor unit (160), a processor (170), a reduction unit (180), a storage unit (10), and a nitrogen oxide sensor unit (190).

[0053] The processor (170) controls the overall operation of the CO2 capture device (100).

[0054] Specifically, the processor (170) includes RAM (171), ROM (172), main CPU (173), graphics processing unit (174), first to n interfaces (175-1 to 175-n), and a bus (176).

[0055] RAM (171), ROM (172), main CPU (173), graphics processing unit (174), first to n interfaces (175-1 to 175-n), etc. can be connected to each other via a bus (176).

[0056] The first to n interfaces (175-1 to 175-n) are connected to the various components described above. One of the interfaces may be a network interface connected to an external device through a network.

[0057] The main CPU (173) accesses the storage unit (10) and performs booting using the O / S stored in the storage unit (10). Then, it performs various operations using various programs, content, data, etc. stored in the storage unit (10).

[0058] In particular, the main CPU (173) can control the control valve (110) based on the exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) sensed through the sensor unit, thereby distributing the exhaust gas flow rate to at least one of the first line (130), the second line (140), and the bypass line (150).

[0059] A set of instructions for booting the system is stored in the ROM (172). When a turn-on command is input and power is supplied, the main CPU (173) copies the O / S stored in the storage unit (10) to the RAM (171) according to the instructions stored in the ROM (172), and executes the O / S to boot the system. When booting is complete, the main CPU (173) copies various application programs stored in the storage unit (10) to the RAM (171), and executes the application programs copied to the RAM (171) to perform various operations.

[0060] The graphics processing unit (174) generates a screen containing various objects such as icons, images, and text using a calculation unit (not shown) and a rendering unit (not shown). The calculation unit (not shown) calculates attribute values ​​such as coordinate values, shape, size, and color for each object to be displayed according to the layout of the screen based on a received control command. The rendering unit (not shown) generates a screen of various layouts containing objects based on the attribute values ​​calculated by the calculation unit (not shown).

[0061] In particular, the graphics processing unit (174) can implement objects generated by the main CPU (173) into a GUI (Graphic User Interface), icon, user interface screen, etc.

[0062] Meanwhile, the operation of the above-described processor (170) can be performed by a program stored in the storage unit (10).

[0063] The storage unit (10) stores various data, such as an O / S (Operating System) software module for operating the CO2 capture device (100) and various multimedia content.

[0064] In particular, the storage unit (10) may include a software module for controlling a control valve (110) based on the exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) sensed through the sensor unit to distribute the exhaust gas flow rate to at least one of the first line (130), the second line (140), and the bypass line (150).

[0065] FIG. 9 is a drawing relating to a software module stored in a storage unit according to an embodiment of the present invention.

[0066] Referring to FIG. 9, the storage unit (10) may store programs such as an exhaust gas flow rate and temperature sensing module (11), a nitrogen oxide efficiency calculation module (12), and a control valve control module (13).

[0067] Meanwhile, the operation of the processor (170) described above can be performed by a program stored in the storage unit (10). Below, the detailed operation of the processor (170) using the program stored in the storage unit (10) will be explained in detail.

[0068] Specifically, the exhaust gas flow rate and temperature sensing module (11) can sense the exhaust gas flow rate and temperature of each of the first line and the second line.

[0069] In addition, the nitrogen oxide efficiency calculation module (12) can calculate and monitor the nitrogen oxide efficiency based on the nitrogen oxides at the front and rear ends of the CO2 capture device (100) sensed through the nitrogen oxide sensor unit (190).

[0070] Additionally, the control valve control module (13) can control the control valve (110) based on the exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) sensed through the sensor unit (160) to distribute the exhaust gas flow rate to at least one of the first line (130), the second line (140), and the bypass line (150).

[0071] Additionally, the control valve (110) can be controlled to distribute the flow rate of exhaust gas to the first line (130), the second line (140), and the bypass line (150) based on at least one of the calculated nitrogen oxide efficiency and the sensed exhaust gas flow rate and temperature of each of the first line (130) and the second line (140).

[0072] Meanwhile, a non-transitory computer-readable medium storing a program that sequentially performs the control method according to the present invention may be provided.

[0073] A non-transient readable medium refers to a medium that stores data semi-permanently and can be read by a device, rather than a medium that stores data for a short period of time, such as a register, cache, or memory. Specifically, the various applications or programs described above may be stored and provided on non-transient readable media such as CDs, DVDs, hard disks, Blu-ray discs, USBs, memory cards, and ROMs.

[0074] Additionally, although the bus is not shown in the block diagram above illustrating the CO2 capture device, a processor such as a CPU or microprocessor may be further included to control the control valve (110) based on the exhaust gas flow rate and temperature of each of the first line (130) and the second line (140) sensed through the sensor unit (160) and distribute the exhaust gas flow rate to at least one of the first line (130), the second line (140), and the bypass line (150).

[0075] Furthermore, although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. It is understood that various modifications can be made by those skilled in the art without departing from the essence of the invention as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention. Explanation of the symbols

[0076] 100: CO2 capture device 110: Control valve 120: Heat exchange section 130: 1st line 140: Line 2 150: Bypass line 160: Sensor unit 170: Processor 180: Reduction unit 190: Nitrogen oxide sensor unit 10: Storage section

Claims

Claim 1 A CO2 capture device comprises: a control valve for distributing the flow rate of exhaust gas; a first line for capturing CO2 using a low-temperature adsorbent when the exhaust gas is introduced; a heat exchanger installed upstream of the first line to maintain the introduced exhaust gas at a preset temperature; a second line for capturing CO2 using a medium-temperature adsorbent when the exhaust gas is introduced; a bypass line for passing the exhaust gas without capturing CO2 when the exhaust gas is introduced; a sensor unit for sensing the flow rate and temperature of the exhaust gas of each of the first line and the second line; a processor for controlling the control valve based on the flow rate and temperature of the exhaust gas of each of the first line and the second line sensed through the sensor unit to distribute the flow rate of the exhaust gas to at least one of the first line, the second line, and the bypass line; and a reduction unit for reducing particulate matter and nitrogen oxides upstream of the CO2 capture device. A CO2 capture device comprising: a nitrogen oxide sensor unit disposed at the front and rear ends of the CO2 capture device to sense nitrogen oxides; wherein the processor calculates and monitors nitrogen oxide efficiency based on the sensed nitrogen oxides at the front and rear ends; and wherein the processor controls the control valve to distribute a portion of the exhaust gas flow rate to the first line if the temperature of the exhaust gas is lower than the preset temperature based on the sensed exhaust gas flow rate and temperature of each of the first line and the second line, and controls the control valve to distribute the remaining exhaust gas flow rate to the bypass line based on the flow rate and temperature of the exhaust gas distributed to the first line. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A CO2 capture device according to claim 1, wherein the processor controls the control valve to distribute the remaining flow of the exhaust gas to the bypass line based on the flow rate and temperature of the first and second lines, wherein if the temperature of the exhaust gas is higher than the preset temperature, the processor maintains a portion of the flow rate of the exhaust gas at the preset temperature through the heat exchanger and distributes the flow rate of the exhaust gas maintained at the preset temperature to the first line, if the heat treatment range of the heat exchanger is exceeded, the processor distributes a portion of the remaining flow rate of the exhaust gas to the second line, and, based on the flow rate and temperature of the exhaust gas distributed to the first and second lines, the processor distributes the remaining flow rate of the remaining flow rate of the exhaust gas to the bypass line. Claim 6 A CO2 capture device according to claim 1 or 5, wherein the processor controls the control valve to distribute the flow rate of the exhaust gas to the first line, the second line, and the bypass line based on at least one of the calculated nitrogen oxide efficiency and the sensed exhaust gas flow rate and temperature of each of the first line and the second line. Claim 7 A method for controlling a CO2 capture device comprises: a step of reducing particulate matter and nitrogen oxides at the front end of the CO2 capture device; a step of sensing nitrogen oxides by being positioned at the front and rear ends of the CO2 capture device; a step of calculating and monitoring nitrogen oxide efficiency based on the sensed nitrogen oxides at the front and rear ends; a step of sensing the flow rate and temperature of a first line that captures CO2 using a low-temperature adsorbent and a second line that captures CO2 using a medium-temperature adsorbent, respectively, when exhaust gas is introduced; and a step of distributing the flow rate of the exhaust gas to at least one of the first line and the second line based on the sensed flow rate and temperature of the exhaust gas of the first line and the second line, respectively. A method for controlling a CO2 capture device, comprising: a step of distributing the remaining flow rate of the exhaust gas to a bypass line based on the flow rate and temperature of the exhaust gas distributed to at least one of the first line and the second line; wherein the step of distributing to the bypass line comprises controlling a control valve to distribute a portion of the flow rate of the exhaust gas to the first line if the temperature of the exhaust gas is lower than a preset temperature based on the flow rate and temperature of the exhaust gas of each of the first line and the second line, and controlling the control valve to distribute the remaining flow rate of the exhaust gas to the bypass line based on the flow rate and temperature of the exhaust gas distributed to the first line.

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