KR20240041042A - Exhaust gas treatment system - Google Patents

Abstract

An exhaust gas treatment system is provided by one embodiment of the present invention.
The exhaust gas treatment system according to an embodiment of the present invention is installed on an exhaust pipe that discharges exhaust gas generated from a combustion engine, a cooling tower that cools the exhaust gas, and an absorbent that absorbs carbon dioxide in the exhaust gas supplied from the cooling tower. A carbon dioxide capture device comprising an absorption tower that sprays carbon dioxide, a regeneration tower that receives the absorbent in which carbon dioxide is absorbed from the absorption tower and separates carbon dioxide from the absorbent, and a reboiler that provides the heat source necessary to separate carbon dioxide and the absorbent into the regeneration tower. A boiler that is installed on a branch pipe that branches off from the exhaust pipe between the combustion engine and the cooling tower and joins the exhaust pipe at the front of the cooling tower, and generates steam by burning fuel with mixed air that is a mixture of the branch gas branched into the branch pipe and the outside air. A damper unit installed at the branch point of the branch pipe to control the flow of branch gas branched from the exhaust pipe to the branch pipe, a mixing unit installed on the branch pipe at the front of the boiler unit to mix the branch gas with outside air, And it may include a steam supply pipe that supplies steam produced in the boiler unit to the reboiler as a heat source.

Description

Exhaust gas treatment system {Exhaust gas treatment system}

The present invention relates to an exhaust gas treatment system, and more specifically, to an exhaust gas treatment system that can increase energy efficiency by reducing energy consumed in the reboiler of a carbon dioxide capture device.

As air pollution increases, ship greenhouse gas emission regulations are being strengthened. In order to satisfy the strengthened greenhouse gas emission regulations, carbon dioxide contained in exhaust gas generated during the combustion of fuel is selectively captured and stored. Installation of carbon capture storage (CCS) is essential. The exhaust gas discharged from ships has a low carbon dioxide concentration, so a wet capture method using an amine-based absorbent is usually used. The carbon dioxide capture device cools the exhaust gas in a cooling tower and then collects the carbon dioxide in the absorption tower where the absorbent is present. Carbon dioxide is captured by passing the exhaust gas through the absorbent to absorb the carbon dioxide, and then passing the absorbent that absorbed the carbon dioxide through the regeneration tower to separate the carbon dioxide and the absorbent.

Meanwhile, in order to separate the carbon dioxide absorbed in the absorbent, high-temperature steam is required to raise the temperature of the absorbent. The energy consumed in the reboiler for steam generation is about four times the energy consumed in driving the carbon dioxide capture device excluding the reboiler. To a large extent, there is a problem of low energy efficiency. Accordingly, there was an attempt to supply steam to the reboiler using an exhaust gas recirculation boiler, which generates steam by circulating some of the exhaust gas discharged from the engine. However, in the case of an exhaust gas recirculation boiler, the exhaust gas and Since combustion is performed by mixing outside air, the oxygen concentration is low and there is a high possibility of incomplete combustion.

Accordingly, there is a need for an exhaust gas treatment system that can reduce energy consumed in the reboiler by supplying steam generated in the exhaust gas recirculation boiler to the reboiler while inducing complete combustion of the exhaust gas recirculation boiler.

Republic of Korea Patent No. 10-2424422 (2022.07.19.)

The technical problem to be achieved by the present invention is to provide an exhaust gas treatment system that can increase energy efficiency by reducing energy consumed in the reboiler of a carbon dioxide capture device.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

An exhaust gas treatment system according to an embodiment of the present invention for achieving the above technical problem is installed on an exhaust pipe that discharges exhaust gas generated from a combustion engine, a cooling tower for cooling the exhaust gas, and An absorption tower that injects an absorbent that absorbs carbon dioxide into the exhaust gas, a regeneration tower that receives the absorbent in which carbon dioxide is absorbed from the absorption tower and separates carbon dioxide from the absorbent, and the carbon dioxide and the absorbent are separated by the regeneration tower. It is installed on a carbon dioxide capture device including a reboiler that provides the necessary heat source, and a branch pipe that branches off from the exhaust pipe between the combustion engine and the cooling tower and joins the exhaust pipe at the front of the cooling tower, and branches into the branch pipe. A boiler unit that generates steam by burning fuel with mixed air mixed with the branch gas and outside air, and a damper installed at a branch point of the branch pipe to control the flow of the branch gas branched from the exhaust pipe to the branch pipe. A mixing unit installed on the branch pipe at the front of the boiler unit to mix the branch gas with the outside air, and a steam supply pipe supplying the steam produced in the boiler unit to the reboiler as a heat source. do.

The exhaust gas treatment system may further include a first economizer installed on the exhaust pipe in front of the branch pipe and supplying first steam generated by heat exchange with the exhaust gas to the reboiler.

The exhaust gas treatment system may be installed on the branch pipe between the mixing unit and the boiler unit and may further include a blower that generates rotational force to flow the mixed air into the boiler unit.

The mixing unit is interposed between the branch pipes, both ends of which are in communication with the branch pipes, a first flow pipe through which the branch gas flows, and a first flow pipe on one side of the first flow pipe toward the flow direction of the branch gas. It may include a second flow pipe that is obliquely connected and through which the outside air flowing in from the outside flows, and a blowing fan installed in the second flow pipe and generating rotational force to flow the outside air into the first flow pipe.

The mixing unit further includes an ejector installed on the branch pipe between the damper unit and the blower, wherein the ejector includes a nozzle unit that ejects the external air supplied from the external air supply pipe at high speed, and a nozzle unit that ejects the external air supplied from the external air supply pipe and the nozzle unit. A diffuser unit that discharges the outside air into the branch pipe at the front end of the blower, and a suction unit interposed between the nozzle unit and the diffuser unit, one side of which is connected to the branch pipe at the rear end of the damper unit to suck in the branch gas. May include wealth.

The exhaust gas treatment system is installed on the branch pipe between the mixing unit and the blower, and includes a chamber part inside which a space is formed for mixing the branch gas and the outside air, and a chamber part inside the chamber part where the branch gas and the outside air are mixed. It may further include at least one blade that is installed at an angle toward the flow direction of the outside air and generates a vortex.

According to the present invention, the damper unit controls the flow of branch gas branched from the exhaust pipe to the branch pipe, and the mixing unit is installed at the front of the boiler unit to mix the branch gas and outside air, so that the branch gas and outside air are mixed at an appropriate flow rate to reach the boiler unit. It can be adjusted to the minimum oxygen concentration required for combustion, and thus complete combustion can be achieved in the boiler section. In particular, since the damper unit adjusts the flow rate of branch gas in response to the load of the combustion engine or the pressure drop of the combustion engine, performance degradation and failure of the combustion engine and boiler unit can be prevented.

In addition, as the steam generated in each of the boiler unit, first economizer, and second economizer is supplied to the reboiler, energy consumed in the reboiler can be reduced, thereby increasing energy efficiency.

1 is a diagram illustrating an exhaust gas treatment system according to an embodiment of the present invention.
Figure 2 is an enlarged view of the carbon dioxide capture device.
Figure 3 is an enlarged view of part A of Figure 1.
Figure 4 is an enlarged view of part B of Figure 1.
Figure 5 is an operational diagram to explain the operation of the exhaust gas treatment system.
Figure 6 is a diagram showing an exhaust gas treatment system according to another embodiment of the present invention.
Figure 7 is a diagram showing an exhaust gas treatment system according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, with reference to FIGS. 1 to 6, an exhaust gas treatment system according to an embodiment of the present invention will be described in detail.

The exhaust gas treatment system according to an embodiment of the present invention is a system that removes carbon dioxide contained in exhaust gas discharged from a combustion engine such as a main engine, and can be installed, for example, on a ship.

In the exhaust gas treatment system, the damper part controls the flow of branch gas branched from the exhaust pipe to the branch pipe, and the mixing part is installed at the front of the boiler unit to mix the branch gas and outside air, so the branch gas and outside air are mixed at an appropriate flow rate to reach the boiler. It can be adjusted to the minimum oxygen concentration required for combustion, and thus complete combustion can be achieved in the boiler section. In particular, since the damper unit adjusts the flow rate of branch gas in response to the load of the combustion engine or the pressure drop of the combustion engine, performance degradation and failure of the combustion engine and boiler unit can be prevented. In addition, as steam generated in the boiler unit, first economizer, and second economizer are supplied to the reboiler, energy consumed in the reboiler can be reduced, thereby increasing energy efficiency.

Hereinafter, with reference to FIGS. 1 to 4, the exhaust gas treatment system 1 will be described in detail.

FIG. 1 is a diagram showing an exhaust gas treatment system according to an embodiment of the present invention, FIG. 2 is an enlarged view of a carbon dioxide capture device, and FIG. 3 is an enlarged view of portion A of FIG. 1. Figure 4 is an enlarged view of part B of Figure 1.

The exhaust gas treatment system 1 according to the present invention includes a carbon dioxide capture device 10, a boiler unit 20, a damper unit 30, a mixing unit 40, and a steam supply pipe 50.

The carbon dioxide capture device 10 is a device installed on the exhaust pipe 110 that discharges the exhaust gas generated from the combustion engine 100 and captures carbon dioxide contained in the exhaust gas using a wet capture method. Here, the combustion engine 100 ) refers to generating power by burning liquefied natural gas, or natural gas in which liquefied natural gas has been vaporized. For example, it may be a main engine that generates propulsion. Exhaust gas resulting from combustion of fuel in the combustion engine 100 is discharged through the exhaust pipe 110, and the carbon dioxide capture device 10 installed on the exhaust pipe 110 includes a cooling tower 11, an absorption tower 12, and a regeneration tower ( 13), and a reboiler 14.

Referring to FIG. 2, the cooling tower 11 cools the exhaust gas supplied through the exhaust pipe 110, and can cool the exhaust gas by spraying cooling water into the exhaust gas. Since the exhaust gas supplied through the exhaust pipe 110 is high temperature, if it is supplied to the absorption tower 12 without separate cooling, carbon dioxide is not properly absorbed by the absorbent. In other words, the absorbent sprayed from the absorption tower 12 has a high carbon dioxide absorption rate at about 30 to 50° C., so the exhaust gas is cooled in advance in the cooling tower 11. Since the first economizer 60 is installed on the exhaust pipe 110 between the combustion engine 100 and the cooling tower 11 to generate first steam by exchanging heat with the exhaust gas, the exhaust gas passes through the first economizer 60 and After being pre-cooled, it can be supplied to the cooling tower (11). As the exhaust gas is precooled in the first economizer 60, the temperature of the exhaust gas flowing into the cooling tower 11 can be lowered in advance, thereby reducing the size and capacity of the cooling tower 11. Accordingly, the size and capacity of the cooling tower 11 can be reduced. Energy from operation can be saved. The first steam generated in the first economizer 60 may be supplied to the reboiler 14, which will be described later, and used as a heat source to separate the absorbent and carbon dioxide, and may be supplied to various needs within the ship. The exhaust gas supplied to the cooling tower (11) is cooled to an appropriate temperature through heat exchange with the cooling water, and the cooling water heated by heat exchange with the exhaust gas is discharged from the cooling tower (11) and then goes through a series of cooling processes to return to the cooling tower (11). It circulates. For example, the cooling water discharged from the cooling tower 11 may be pressurized, cooled through heat exchange with the cooling medium, and then circulated back to the cooling tower 11. The exhaust gas cooled in the cooling tower (11) is supplied to the absorption tower (12).

The absorption tower 12 atomizes or atomizes an absorbent that absorbs carbon dioxide and injects it into the exhaust gas supplied from the cooling tower 11. Here, the absorbent refers to an absorbent that absorbs carbon dioxide. It may be a solution with properties, for example, an amine compound or an aqueous ammonia solution. The exhaust gas is supplied to the lower part of the absorption tower 12 and comes into gas-liquid contact with the absorbent sprayed from the top of the absorption tower 12. As a result, carbon dioxide contained in the exhaust gas can be absorbed by the absorbent and removed from the exhaust gas. Since an exothermic reaction occurs when carbon dioxide is absorbed in the absorption tower 12, the exhaust gas from which the carbon dioxide has been removed can be discharged to the outside through a separate cooling process at the top of the absorption tower 12. For example, the exhaust gas from which carbon dioxide has been removed may be exhausted through the post-exhaust pipe 110 cooled by gas-liquid contact with a cooling medium such as fresh water sprayed from the top of the absorption tower 12, and the cooling medium in contact with the exhaust gas. After being collected and discharged to the outside of the absorption tower (12), it can be circulated back to the absorption tower (12) through pressurization and cooling processes. The absorbent that absorbs carbon dioxide in the absorption tower (12) is supplied to the regeneration tower (13).

The regeneration tower 13 receives the absorbent in which carbon dioxide is absorbed from the absorption tower 12 and separates carbon dioxide from the absorbent. More specifically, the absorbent in which carbon dioxide is absorbed is supplied to the top of the regeneration tower 13, and carbon dioxide can be separated by thermal energy as it flows from the top to the bottom of the regeneration tower 13. At this time, some of the absorbent inside the regeneration tower (13) flows into the reboiler (14) through the circulation line (13a) and is heated, and carbon dioxide and vapor generated from the absorbent by heating of the reboiler (14) are heated through the circulation line (13a). It can be circulated to the regeneration tower (13) through (13a) to provide additional heat energy and increase the separation rate of carbon dioxide.

The reboiler 14 provides the heat source necessary to separate carbon dioxide and the absorbent through the regeneration tower 13, and uses steam produced in the boiler unit 20, which will be described later, and supplied through the steam supply pipe 50 as a heat source to separate the absorbent from the carbon dioxide. can be heated. The high concentration of carbon dioxide separated from the absorbent is discharged to the top of the regeneration tower (13), passes through the condenser (15) and the reflux drum (16) in turn, removes moisture, and goes through a separate compression or liquefaction process to be supplied or stored where necessary. It can be. Moisture separated from carbon dioxide in the reflux drum 26 may be pressurized and circulated back to the regeneration tower 13.

The regeneration tower 13 may receive an absorbent in which carbon dioxide has been absorbed through the first line 12a, and circulate the absorbent from which the carbon dioxide has been separated to the absorption tower 12 through the second line 13b.

The first line (12a) has one end connected to the lower part of the absorption tower (12) and the other end connected to the upper part of the regeneration tower (13), so that the absorbent that absorbs the carbon dioxide discharged from the absorption tower (12) is connected to the upper part of the regeneration tower (13). can be supplied. At least one pump (not shown) and a heat exchanger 121 that pressurize the absorbent that absorbs carbon dioxide may be installed on the first line 12a.

The second line (13b) has one end connected to the lower part of the regeneration tower (13) and the other end connected to the upper part of the absorption tower (12), so that the carbon dioxide discharged from the regeneration tower (13) is transferred to the separated absorbent to the upper part of the absorption tower (12). can be supplied. Since the heat exchanger 121, a pump (not shown), and a cooler 131 are installed on the second line 13b, the water discharged from the regeneration tower 13 to the second line 13b is about 80 to 150°C. The absorbent from which the carbon dioxide is separated may be cooled in multiple stages and supplied to the absorption tower 12 at about 30 to 50°C.

The heat exchanger 121 heats the absorbent in which the carbon dioxide absorbed is supplied to the regeneration tower 13 by exchanging heat between the first line 12a and the second line 13b. That is, the heat exchanger 121 supplies the absorbent at about 30 to 50°C supplied from the absorption tower 12 to the regeneration tower 13 through the first line 12a, and the regeneration tower (13b) through the second line 13b. By heat exchanging the absorbent at about 80 to 150°C supplied to the absorption tower (12) in 13), the temperature of the absorbent supplied to the regeneration tower (13) is increased, and the temperature of the absorbent circulated to the absorption tower (12) is lowered. As the temperature of the absorbent supplied to the regeneration tower 13 increases, carbon dioxide can be separated more effectively in the regeneration tower 13, and as the temperature of the absorbent circulated to the absorption tower 12 decreases, the absorption tower 12 ), carbon dioxide can be more easily absorbed into the absorbent.

Meanwhile, a branch pipe 120 branches off the exhaust pipe 110 between the combustion engine 100 and the cooling tower 11, and more specifically, the exhaust pipe 110 between the first economizer 60 and the cooling tower 11. The branch pipe 120 is a pipe that branches out some of the pre-cooled exhaust gas passing through the first economizer 60 and supplies it to the boiler unit 20, which will be described later, between the first economizer 60 and the cooling tower 11. It may branch from the exhaust pipe 110 and rejoin the exhaust pipe 110 at the front of the cooling tower 11. The branch pipe 120 may have a diameter less than 1/2 of the diameter of the exhaust pipe 110, and the boiler unit 20 is installed on the branch pipe 120.

The boiler unit 20 generates steam by burning fuel with mixed air that is a mixture of branch gas branched into the branch pipe 120 and fresh air. For example, it may be an EGR boiler. . More specifically, the boiler unit 20 generates combustion heat by burning fuel with the heat of mixed air mixed with branch gas and outside air, and heats water supplied from the water supply pipe 21 with the generated combustion heat to generate steam. That is, the boiler unit 20 is connected to a branch pipe 120 for supplying branch gas, a fuel pipe (not shown) for supplying fuel, and a water supply pipe 21 for supplying water, and as necessary, An external pipe (not shown) that directly supplies air or pure oxygen may be connected. Due to the characteristics of the boiler unit 20, sufficient combustion efficiency may not occur if mixed air containing branch gas and outside air is injected instead of air, so air or pure oxygen can be additionally supplied to increase combustion efficiency in the boiler unit. there is.

Steam produced in the boiler unit 20 may be provided as a heat source to the reboiler 14 through the steam supply pipe 50. The steam and first steam generated in the boiler unit 20 and the first economizer 60, respectively, are supplied to the reboiler 14 and used as a heat source to separate carbon dioxide and the absorbent, thereby reducing the capacity of the reboiler 14. This not only saves energy due to the operation of the reboiler 14, but also increases space utilization within the ship, and minimizes the generation of additional carbon dioxide, so an increase in net carbon capture can be expected. In addition, the branch gas branched into the branch pipe 120 is re-combusted in the boiler unit 20, and the exhaust gas discharged from the boiler unit 20 rejoins the exhaust gas discharged from the combustion engine 100 to capture carbon dioxide. By being supplied to the device 10, the carbon dioxide concentration in the exhaust gas supplied to the carbon dioxide capture device 10 increases, thereby increasing the net carbon capture amount.

Referring to Figure 3, a damper unit 30 is installed at the branch point of the branch pipe 120. The damper unit 30 controls the flow of branch gas branched from the exhaust pipe 110 to the branch pipe 120, and may be, for example, an air duct damper. By installing the damper unit 30 at the branch point of the branch pipe 120, the branch pipe 120 branches from the exhaust pipe 110 in response to the load of the combustion engine 100 or the pressure drop of the combustion engine 100. Since the flow rate of branch gas can be adjusted, performance degradation and breakdown of the combustion engine 100 and boiler unit 20 can be prevented. When operating a ship, the flow rate of exhaust gas also changes in response to changes in the load of the combustion engine 100. When the boiler unit 20 is operated at maximum capacity, the minimum oxygen concentration required for combustion can be met by increasing the outside air flow rate even if the exhaust gas flow rate of the combustion engine 100 is reduced, but the load on the combustion engine 100 increases. Therefore, when the exhaust gas flow rate of the combustion engine 100 increases, the maximum capacity of the boiler unit 20 cannot be increased, so the damper unit 30 is operated to optimize the flow rate of the branch gas supplied to the boiler unit 20. It can be adjusted by flow rate. In addition, the pressure drop value that can be tolerated by the combustion engine 100 is determined, and in components disposed at the rear end of the boiler unit 20, for example, the second economizer 90, the cooling tower 11, and piping, which will be described later. Since a pressure drop may occur and cause a strain to the combustion engine 100, the flow rate of the branch gas supplied to the boiler unit 20 can be adjusted to an appropriate flow rate by operating the damper unit 30.

A mixing unit 40 is installed on the branch pipe 120 at the front of the boiler unit 20 to mix the branch gas and outside air. By mixing the branch gas and outside air in the mixing unit 40, complete combustion can be achieved in the boiler unit 20.

Referring to Figure 4, the mixing unit 40 includes a first flow pipe 41, a second flow pipe 42, and a blowing fan 43. The first flow pipe 41 is interposed between the branch pipes 120 so that both ends communicate with the branch pipes 120, and branch gas can flow therein. That is, the branch gas branched from the exhaust pipe 110 to the branch pipe 120 flows sequentially through the first flow pipe 41 and the branch pipe 120 and is supplied to the boiler unit 20. The second flow pipe 42 is connected to one side of the first flow pipe 41 at an angle toward the flow direction of the branch gas, and allows outside air flowing in from the outside to flow. The second flow pipe 42 can receive outside air by connecting an outside air supply pipe 80 to one side connected to the first flow pipe 41 and the other side opposite to the other side. The blowing fan 43 is installed inside the second flow pipe 42 and can generate rotational force to flow outside air into the first flow pipe 41. As described above, the second flow pipe 42 is obliquely connected to the first flow pipe 41 toward the flow direction of the branch gas, and the blowing fan 43 generates a rotational force inside the second flow pipe 42 to force outside air. Because it flows, the outside air can be easily mixed with the branch gas.

Since a blower 70 is installed on the branch pipe 120 between the mixing unit 40 and the boiler unit 20 to generate rotational force to flow the mixed air mixed with the branch gas and outside air to the boiler unit 20, the branch The gas and outside air may be further mixed and then supplied to the boiler unit 20.

The branch gas discharged after combustion in the boiler unit 20 joins the exhaust pipe 110 along the branch pipe 120, is mixed with the exhaust gas discharged from the combustion engine 100, and is supplied to the second economizer 90. . The second economizer 90 is installed on the exhaust pipe 110 at the rear end of the branch pipe 120, and can supply the second steam generated by heat exchange with the mixed gas of exhaust gas and branch gas to the reboiler 14. there is. As the second economizer 90 is installed in the exhaust pipe 110 at the rear end of the branch pipe 120, the mixed gas of the exhaust gas and the branch gas is pre-cooled in the second economizer 90 and then supplied to the cooling tower 11. Not only does the cooling efficiency of the cooling tower 11 improve, but the size and capacity of the cooling tower 11 can be further reduced, thereby further saving energy due to the operation of the cooling tower 11. The second steam generated in the second economizer 90 may be supplied to the reboiler 14 and used as a heat source to separate the absorbent and carbon dioxide, and may be supplied to various needs within the ship.

Hereinafter, with reference to FIG. 5, the operation of the exhaust gas treatment system 1 will be described in more detail.

Figure 5 is an operational diagram to explain the operation of the exhaust gas treatment system.

In the exhaust gas treatment system 1 according to the present invention, the damper unit 30 controls the flow of branch gas branched from the exhaust pipe 110 to the branch pipe 120, and the mixing unit 40 controls the flow of branch gas from the exhaust pipe 110 to the branch pipe 120. ) Since it is installed at the front and mixes branch gas and outside air, the branch gas and outside air can be mixed at an appropriate flow rate to adjust to the minimum oxygen concentration required for combustion of the boiler unit 20. Accordingly, the boiler unit 20 can completely Combustion may occur. In particular, since the damper unit 30 adjusts the flow rate of the branch gas in response to the load of the combustion engine 100 or the pressure drop of the combustion engine 100, the performance of the combustion engine 100 and the boiler unit 20 is reduced and Breakdowns can be prevented. In addition, as the steam generated in the boiler unit 20, the first economizer 60, and the second economizer 90 is supplied to the reboiler 14, the energy consumed in the reboiler 14 can be reduced. This can increase energy efficiency.

Exhaust gas resulting from the combustion of fuel in the combustion engine 100 is discharged to the exhaust pipe 110 and pre-cooled in the first economizer 60. Part of it flows along the exhaust pipe 110 and the remaining part flows through the branch pipe 120. flows along. The damper unit 30 installed at the branch point of the branch pipe 120 is a branch gas branched from the exhaust pipe 110 to the branch pipe 120 in response to the load of the combustion engine 100 or the pressure drop of the combustion engine 100. The flow rate can be adjusted.

The branch gas branched into the branch pipe 120 passes through the mixing unit 40, is mixed with the outside air supplied through the outside air supply pipe 80, and flows into the boiler unit 20. The boiler unit 20 mixes the branch gas with the branch gas. Combustion heat is generated by burning fuel with the heat of the mixed air mixed with outside air, and the generated combustion heat is used to heat water supplied from the water supply pipe 21 to generate steam. The branch gas discharged after combustion in the boiler unit 20 flows along the branch pipe 120 and joins the exhaust pipe 110, and is mixed with the exhaust gas discharged from the combustion engine 100 in the second economizer 90. After being pre-cooled, it is supplied to the cooling tower (11) of the carbon dioxide capture device (10).

The exhaust gas cooled in the cooling tower 11 is supplied to the absorption tower 12, and the absorption tower 12 sprays an absorbent that absorbs carbon dioxide into the exhaust gas supplied from the cooling tower 11 to remove carbon dioxide from the exhaust gas. . The exhaust gas from which the carbon dioxide has been removed is exhausted through the exhaust pipe 110 connected to the upper part of the absorption tower 12, and the absorbent absorbing carbon dioxide is supplied to the regeneration tower 13. The regeneration tower 13 receives the absorbent in which carbon dioxide is absorbed from the absorption tower 12 and receives the heat source necessary to separate the absorbent and carbon dioxide from the reboiler 14 to separate carbon dioxide from the absorbent. The heat source provided by the reboiler 14 to the regeneration tower 13 may be produced in the boiler unit 20 and supplied to the reboiler 14 through the steam supply pipe 50. In addition, it may be produced in the first economizer 60 and the second economizer 90 and supplied to the reboiler 14 through a separate pipe (not shown). The high concentration of carbon dioxide separated from the absorbent can be discharged from the regeneration tower 13, condensed and dehydrated, and then supplied or stored where needed through a separate compression or liquefaction process.

Hereinafter, with reference to FIG. 6, the exhaust gas treatment system 1-1 according to another embodiment of the present invention will be described in more detail.

Figure 6 is a diagram showing an exhaust gas treatment system according to another embodiment of the present invention.

In the exhaust gas treatment system 1-1 according to another embodiment of the present invention, the chamber unit 46 is installed on the branch pipe 120 between the mixing unit 40 and the blower 70. The exhaust gas treatment system 1-1 according to another embodiment of the present invention is as described above, except that the chamber unit 46 is installed on the branch pipe 120 between the mixing unit 40 and the blower 70. It is substantially the same as one embodiment. Therefore, this will be mainly explained, but unless otherwise stated, the description of the remaining components will be replaced by the above-described details.

A chamber unit 46 may be installed on the branch pipe 120 between the mixing unit 40 and the blower 70, with a space inside for mixing branch gas and outside air. By installing the chamber unit 46 between the mixing unit 40 and the blower 70, the branch gas and outside air can remain and be sufficiently mixed, and thus, complete combustion of the boiler unit 20 can be achieved more easily. there is. Since the chamber part 46 is installed at an angle toward the flow direction of the branch gas and outside air and has at least one blade 47 that generates a vortex, the branch gas and outside air are easily mixed inside the chamber part 46. It can be. In the drawing, the flat blade-shaped blades 47 are shown in pairs and arranged symmetrically up and down, but this is not limited to this, and the shape and arrangement of the blades 47 may be modified in various ways. Additionally, the blade 47 is not limited to being installed inside the chamber portion 46, and the blade 47 may be omitted as needed.

Hereinafter, with reference to FIG. 7, the exhaust gas treatment system 1-2 according to another embodiment of the present invention will be described in more detail.

Figure 7 is a diagram showing an exhaust gas treatment system according to another embodiment of the present invention.

In the exhaust gas treatment system 1-2 according to another embodiment of the present invention, the mixing unit 40 includes an ejector 44 consisting of a nozzle unit 44a, a diffuser unit 44b, and a suction unit 44c. Includes. In the exhaust gas treatment system 1-2 according to another embodiment of the present invention, the mixing unit 40 includes an ejector 44 consisting of a nozzle unit 44a, a diffuser unit 44b, and a suction unit 44c. Except for the inclusion, it is substantially the same as the above-described embodiment. Therefore, this will be mainly explained, but unless otherwise stated, the description of the remaining components will be replaced by the above-described details.

The mixing unit 40 includes an ejector 44 installed on the branch pipe 120 between the damper unit 30 and the blower 70, and can mix branch gas and outside air. When the mixing unit 40 includes the ejector 44, the branch pipe 120 may have a diameter of 1/6 or less of the diameter of the exhaust pipe 110. The ejector 44 has a nozzle unit 44a that ejects external air supplied from the external air supply pipe 80 at high speed, and discharges external air passing through the nozzle unit 44a to the branch pipe 120 in front of the blower 70. A diffuser unit 44b, and an intake unit 44c interposed between the nozzle unit 44a and the diffuser unit 44b and connected on one side to the branch pipe 120 at the rear end of the damper unit 30 to suck in branch gas. Includes. The nozzle unit 44a ejects external air supplied from the external air supply pipe 80 at high speed, and in the process of moving external air ejected at high pressure from the nozzle unit 44a to the diffuser unit 44b, negative pressure is generated in the suction unit 44c. This is formed. When negative pressure is formed in the suction part 44c, branch gas is sucked in through the branch pipe 120 connected to one side of the suction part 44c and can move to the diffuser part 44b together with the outside air. The branch gas and outside air moving to the diffuser unit 44b may be further mixed by the blower 70 installed on the branch pipe 120 and then supplied to the boiler unit 20.

Meanwhile, a blowing fan 45 may be installed inside the outside air supply pipe 80. The blowing fan 45 can generate rotational force inside the outside air supply pipe 80 to flow outside air into the nozzle portion 44a. As the blowing fan 45 generates rotational force in the outside air, the outside air can pass through the nozzle portion 44a at high speed, making it easier to inhale the branch gas.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

1, 1-1, 1-2: Exhaust gas treatment system
10: Carbon dioxide capture device 11: Cooling tower
12: absorption tower 13: regeneration tower
14: reboiler 20: boiler unit
30: Damper unit 40: Mixing unit
50: Steam supply pipe 60: First economizer
70: blower 80: external air supply pipe
90: second economizer 100: combustion engine
110: exhaust pipe 120: branch pipe

Claims (6)

It is installed on an exhaust pipe that discharges exhaust gas generated from a combustion engine, and includes a cooling tower that cools the exhaust gas, an absorption tower that sprays an absorbent that absorbs carbon dioxide into the exhaust gas supplied from the cooling tower, and A carbon dioxide capture device including a regeneration tower that receives the absorbent in which carbon dioxide is absorbed and separates carbon dioxide from the absorbent, and a reboiler that provides a heat source necessary for separation of carbon dioxide and the absorbent into the regeneration tower;
It is installed on a branch pipe branched from the exhaust pipe between the combustion engine and the cooling tower and joined to the exhaust pipe at the front of the cooling tower, and steam is generated by burning fuel with mixed air that is a mixture of the branch gas branched into the branch pipe and outside air. A boiler unit that generates;
A damper unit installed at a branch point of the branch pipe to control the flow of the branch gas branched from the exhaust pipe to the branch pipe;
A mixing unit installed on the branch pipe in front of the boiler unit to mix the branch gas and the outside air, and
An exhaust gas treatment system including a steam supply pipe that supplies the steam produced in the boiler unit to the reboiler as a heat source. According to claim 1,
The exhaust gas treatment system is installed on the exhaust pipe in front of the branch pipe and further includes a first economizer that supplies first steam generated by heat exchange with the exhaust gas to the reboiler. According to claim 1,
The exhaust gas treatment system is installed on the branch pipe between the mixing unit and the boiler unit and further includes a blower that generates rotational force to flow the mixed air into the boiler unit. The method of claim 3, wherein the mixing unit,
a first flow pipe interposed between the branch pipes, both ends of which are in communication with the branch pipes, and through which the branch gas flows;
a second flow pipe connected to one side of the first flow pipe at an angle toward the flow direction of the branch gas and through which the outside air flowing in from the outside flows; and
An exhaust gas treatment system including a blowing fan installed in the second flow pipe and generating rotational force to flow the outside air into the first flow pipe. The method of claim 3, wherein the mixing unit,
It further includes an ejector installed on the branch pipe between the damper unit and the blower,
The ejector is,
A nozzle unit that ejects the outside air supplied from the outside air supply pipe at high speed,
A diffuser unit that discharges the outside air that has passed through the nozzle unit into the branch pipe at the front of the blower, and
An exhaust gas treatment system comprising an intake part interposed between the nozzle part and the diffuser part, and one side of which is connected to the branch pipe at a rear end of the damper part to suck in the branch gas. According to clause 3,
A chamber part installed on the branch pipe between the mixing part and the blower, and having a space inside where the branch gas and the outside air are mixed, and
The exhaust gas treatment system further includes at least one blade installed inside the chamber portion at an angle toward a flow direction of the branch gas and the outside air to generate a vortex.

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