Exhaust gas cooler

Abstract

The present invention relates to an exhaust gas cooler for an exhaust gas recirculation system which is installed on a ship and cools and returns exhaust gas discharged from an engine back to the engine. More specifically, the exhaust gas cooler includes: a pre-cooling tower that performs primary cooling of exhaust gas that has flowed into a pre-cooling chamber; and a main cooling tower that is connected to the pre-cooling tower via a pre-cooling connector, performs secondary cooling of the primarily cooled exhaust gas, and has a main cooling housing part forming a main cooling chamber therein, wherein the main cooling tower has a cooling water tank, for storing cooling water that has been discharged after cooling the exhaust gas, integrally formed with a sump part of the main cooling housing part, and prevents the cooling water from flowing in when the ship tilts.

Description

exhaust gas cooler

[0001] The present invention relates to an exhaust gas cooler, and more particularly, to an exhaust gas cooler including a pre-cooling tower for primary cooling exhaust gas introduced into a pre-cooling chamber, and a main cooling housing part that is connected to the pre-cooling tower through a pre-cooling connection part to secondary cool the primary cooled exhaust gas, and forms a main cooling chamber therein, wherein the main cooling tower is formed integrally with a cooling water tank that stores cooling water discharged after cooling the exhaust gas in a sump part of the main cooling housing part, and prevents the inflow of cooling water when the ship is tilted.

[0002] Ships are equipped with a main engine that rotates the propeller, a power generation engine that generates electricity, etc., and they burn the supplied fuel to rotate the propeller or generate electricity. In this process, the engine emits exhaust gas generated by the combustion of the fuel.

[0003] The above exhaust gas may contain unburned fuel components or harmful components in the engine. For example, if the engine burns natural gas (LNG) as fuel, the exhaust gas may contain unburned methane, a phenomenon called methane slip. As another example, if the engine burns heavy oil as fuel, the exhaust gas emitted from the engine may contain nitrogen oxides, also known as NOx.

[0004] If exhaust gas containing harmful substances such as methane slip or nitrogen oxides is released into the atmosphere, it can cause serious environmental pollution. Therefore, an exhaust gas recirculation system (EGR) is installed on ships to reduce harmful substances contained in exhaust gas.

[0005] The above exhaust gas recirculation system (EGR) refers to a device that reduces nitrogen oxides (NOx) and the like contained in exhaust gas by cooling a portion of the exhaust gas generated when fuel is combusted in an engine, mixing it with fuel, and reintroducing it into the engine for combustion. The above exhaust gas recirculation system (EGR) includes an exhaust gas cooler (EGC) that cools exhaust gas discharged from the engine with seawater or fresh water, and the exhaust gas cooled by the exhaust gas cooler (EGC) can be supplied to a turbocharger.

[0006] FIG. 1 is a drawing illustrating a conventional exhaust gas recirculation system (90), which is disclosed in Korean Patent Publication No. 10-2023-0082557 (June 8, 2023).

[0007] Referring to FIG. 1, the conventional exhaust gas recirculation system (90) includes an exhaust gas cooler (91), an exhaust gas branch pipe (92), an exhaust gas supply pipe (93), a cooling water tank (94), a cooling water recovery pipe (95), and a cooling water heat exchanger (96).

[0008] The above exhaust gas cooler (91) is configured to cool the exhaust gas by spraying cooling water on the exhaust gas flowing into the inside, and includes a pre-cooling tower (911) formed in front of the main cooling tower (912) to pre-cool the exhaust gas by spraying cooling water on a portion of the exhaust gas discharged from the exhaust gas discharge side of the engine (E), and a main cooling tower (912) to secondarily cool the exhaust gas by re-spraying cooling water on the exhaust gas that has been primarily cooled in the pre-cooling tower (911). The main cooling tower (912) may be equipped with packing that increases the contact area and contact time between the cooling water and the exhaust gas, and a demister that removes moisture contained in the exhaust gas.

[0009] The above exhaust gas branch pipe (92) is configured such that one side is connected to a portion of the exhaust pipe (EP) following the economizer (EM) in the direction of exhaust gas flow, and the other side is connected to the exhaust gas cooler (91). The above economizer (EM) is configured to create steam using waste heat of the exhaust gas and supply it to a steam usage location of the ship, and a portion of the exhaust gas that has passed through the economizer (EM) can flow to the ship cooling tower (911) by the exhaust gas branch pipe (92).

[0010] The above exhaust gas supply pipe (93) is configured such that one side is connected to the exhaust gas cooler (91) and the other side is connected to the air inlet side of the engine (E), thereby supplying exhaust gas cooled by the exhaust gas cooler (91) to the engine (E).

[0011] The above cooling water tank (94) is connected to the exhaust gas cooler (91) and refers to a configuration that stores cooling water discharged from the exhaust gas cooler (91), and the cooling water recovery pipe (95) refers to a configuration that has one side connected to the exhaust gas cooler (91) and the other side connected to the cooling water tank (94) so ​​that the cooling water sprayed to the exhaust gas cooler (91) is recovered to the cooling water tank (94).

[0012] The coolant recovered in the above coolant tank (94) has a relatively high temperature due to heat exchange with the high-temperature exhaust gas, so if the recovered coolant is not cooled, the cooling effect of the exhaust gas by the coolant may be reduced. To prevent this, a coolant heat exchanger (96) is configured on the rear side of the coolant cooler (94) to cool the recovered coolant.

[0013] However, the above conventional exhaust gas recirculation system (90) used random packing as the packing inside the exhaust gas cooler (91), and when such random packing was used, there was a problem that pressure loss occurred and the heat exchange area was small.

[0014] In addition, when cooling the exhaust gas, a problem occurred in which foreign substances contained in the exhaust gas were captured in the cooling water and contaminated the exhaust gas cooler (91).

[0015] In order to solve this problem, a separate water treatment device was constructed to treat the cooling water stored at the rear of the cooling water tank (94), but the three-way valve used to transfer the treated cooling water from the water treatment device to each device had a large fluctuation range in the flow rate, which caused a problem of causing water hammer.

[0016] Exhaust gas coolers used on land have relatively few installation space constraints and can secure sufficient coolant tank height, allowing for a stable coolant level. However, exhaust gas coolers installed on ships face challenges in maintaining a stable coolant flow due to space constraints and the ship's motion. Typically, ship engines are installed longitudinally, while exhaust gas coolers are positioned transversely. Consequently, when a ship lists laterally (up to 22.5 degrees) and longitudinally (up to 7.5 degrees) during operation, the coolant tank water level fluctuates, potentially increasing turbulence and bubble formation.

[0017] Unstable cooling water flow not only causes cavitation, which reduces cooling system performance, but can also block the gas paths of the pre-cooling tower and main cooling tower, hindering the smooth flow of exhaust gas. In particular, vessel design limits the height of exhaust gas coolers, making it difficult to maintain a sufficient cooling water level. Therefore, if the vessel tilts, the flow within the cooling water tank becomes even more unstable, potentially leading to reduced cooling performance and even durability issues.

[0018] Therefore, to solve these problems, exhaust gas coolers for ships require a structural design that can effectively maintain the level of cooling water and minimize the generation of cooling water swirl and bubbles due to the movement of the ship.

[0019] (Patent Document 1) Korean Patent Publication No. 10-2023-0082557 (June 8, 2023)

[0020] The present invention has been devised to solve the above problems.

[0021] The purpose of the present invention is to provide an exhaust gas cooler including a pre-cooling tower and a main cooling tower, so that rapid cooling of exhaust gas and removal of foreign substances are achieved in the pre-cooling tower, and the main cooling tower can smoothly cool the exhaust gas to a target temperature, and a cooling water tank is integrally formed in a sump of the main cooling housing section so that the related device for exhaust gas cooling does not take up much space, thereby providing an exhaust gas cooler that is easy to install even in ships where securing space is difficult.

[0022] Another object of the present invention is to provide an exhaust gas cooler that includes a sloshing buffer wall that maintains the height of the water surface within the cooling housing section, thereby preventing cavitation and blockage of the gas passage due to cooling water when the ship is rocked.

[0023] Another object of the present invention is to provide an exhaust gas cooler in which the sloshing buffer wall extends from the lower end of the sump section, but minimizes the inflow of cooling water into the interior of the line cooling connection section when the ship is tilted.

[0024] Another object of the present invention is to provide an exhaust gas cooler in which the preset height of the sloshing buffer wall is set so that the height of the water surface within the main cooling housing section is lower than the lower end of the opening formed within the main cooling housing section by the line cooling connection section when the ship is tilted, thereby preventing cooling water from flowing toward the line cooling tower.

[0025] Another object of the present invention is to provide an exhaust gas cooler that can minimize the tower diameter of the cooling tower by forming a packing section with structured packing and thereby reducing the back pressure compared to when the packing section is formed with random packing.

[0026] Another object of the present invention is to provide an exhaust gas cooler in which a sloshing buffer wall has a perforation formed therein so that neighboring subspaces divided by the sloshing buffer wall in the cooling water cooler are in fluid communication.

[0027] Another object of the present invention is to provide an exhaust gas cooler including an anti-vortex device formed of at least one partition plate extending between an inner wall of a coolant outlet to partition the coolant outlet, wherein the sloshing buffer wall and the first partition plate extend on the same plane to adjust the height of the anti-vortex device to prevent sloshing.

[0028] Another object of the present invention is to provide an exhaust gas cooler that reinforces a diffuser section by connecting a diffuser plate and a sloshing buffer wall and supplements the height of the buffer wall.

[0029] Another object of the present invention is to provide an exhaust gas cooler capable of discharging supernatant water while maintaining the pressure inside the exhaust gas cooler by forming an overflow pipe.

[0030] Another object of the present invention is to provide an exhaust gas cooler in which the installation space and pipe length of pipes connected to a cooling water tank having a structure integrated with a sump unit are optimized.

[0031] Another object of the present invention is to provide an exhaust gas cooler that reduces pressure loss and increases heat exchange area by using structured packing to maximize heat exchange efficiency.

[0032] Another object of the present invention is to provide an exhaust gas cooler in which a plurality of packing layers having different packing densities are formed, and the packing density of a packing layer located relatively higher than that of a packing layer located relatively lower is cross-laminated with each other, thereby increasing the removal rate of foreign substances by a lower packing layer having a lower density and achieving high heat exchange by an upper packing layer having a higher density.

[0033] Another object of the present invention is to provide an exhaust gas cooler that comprises a cooling spray unit that sprays water toward the packing unit on the upper side of the packing unit, thereby performing secondary cooling of the primary cooled exhaust gas and removing foreign substances.

[0034] Another object of the present invention is to provide an exhaust gas cooler in which a demister section is formed on the upper side of the cooling spray section, so that moisture accompanying the gas treated at the final stage of the cooling tower is effectively removed.

[0035] Another object of the present invention is to provide an exhaust gas cooler that comprises a demister section to prevent equipment connected to the rear side of the cooling tower, such as a turbocharger, from being damaged by moisture.

[0036] Another object of the present invention is to provide an exhaust gas cooler that increases the moisture removal rate by the demister unit and minimizes the impact of moisture on rear-end equipment such as a turbocharger by configuring a demister unit that includes a vane unit in which a plurality of blades forming an inclined surface are spaced apart to form a gap, and a mesh unit in which a plurality of thin and long wires are intertwined to form a gap on the vane unit.

[0037] Another object of the present invention is to provide an exhaust gas cooler having a cleaning spray unit formed on the upper side of a demister unit so that water for cleaning is sprayed when the cooler is not in operation, thereby enabling easy cleaning of the device.

[0038] However, the technical problems to be solved by the embodiments of the present invention are not limited to the technical problems described above, and other technical problems may exist.

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

[0040] According to one embodiment of the present invention, the present invention includes a main cooling tower having a main cooling tower for primary cooling of exhaust gas introduced into a main cooling chamber, and a main cooling housing part that is connected to the main cooling tower through a main cooling connection part to secondary cool the primary cooled exhaust gas and forms a main cooling chamber therein, wherein the main cooling tower is characterized in that a cooling water tank for storing cooling water discharged after cooling the exhaust gas is integrally formed in a sump part of the main cooling housing part.

[0041] According to another embodiment of the present invention, the present invention is characterized in that the cooling housing part includes a cooling water outlet opening in a downward direction of the sump part, the sump part includes a sloshing buffer wall that maintains the height of the water surface within the cooling housing part when the ship is tilted, and the sloshing buffer wall extends in a first direction from one inner wall of the cooling water tank to the other inner wall.

[0042] According to another embodiment of the present invention, the sloshing buffer wall is characterized in that it extends from the lower end of the sump portion and is formed at a height that minimizes the inflow of cooling water into the interior of the line cooling connection portion when the ship is tilted.

[0043] According to another embodiment of the present invention, the sloshing buffer wall is characterized in that it extends from the lower end of the sump portion to a preset height of the main cooling housing portion, and the preset height is set such that when the ship is tilted, the height of the water surface within the main cooling housing portion is located lower than the lower end of the opening formed within the main cooling housing portion by the line cooling connection portion.

[0044] According to another embodiment of the present invention, the present invention is characterized in that the sloshing buffer wall has a through hole formed therein so that neighboring subspaces divided by the sloshing buffer wall in the cooling water cooler are in fluid communication.

[0045] According to another embodiment of the present invention, the sump includes a vortex preventer formed of at least one partition plate extending between an inner wall of the coolant outlet to partition the coolant outlet, wherein the sloshing buffer wall is formed integrally with a first partition plate among the partition plates of the vortex preventer, and the sloshing buffer wall and the first partition plate extend on the same plane.

[0046] According to another embodiment of the present invention, the present invention is characterized in that the main cooling unit includes a diffuser unit having a plurality of plate-shaped diffuser plates having a plurality of holes formed on one side and penetrating the other side, and the diffuser unit is arranged so that the diffuser plate closer to the central axis of the main cooling housing unit is relatively positioned lower than the main cooling housing unit, and the lower end of the diffuser plate arranged on the side of the central axis of the main cooling housing unit and the sloshing buffer wall are connected.

[0047] According to another embodiment of the present invention, the present invention is characterized in that the diffusion plate and the sloshing buffer wall extend in the same direction.

[0048] According to another embodiment of the present invention, the sump further includes an overflow pipe for maintaining a water level within the main cooling housing portion and discharging upper water to the outside of the main cooling housing portion, wherein the overflow pipe includes an inlet opening upward at a predetermined height within the sump portion, an outlet extending to the outside of the main cooling housing portion, and a seal portion formed in a U shape between the inlet and the outlet.

[0049] According to another embodiment of the present invention, the present invention is characterized in that the overflow pipe further includes a pressure regulating hole formed between the seal portion and the discharge port inside the cooling housing portion.

[0050] According to another embodiment of the present invention, the cooling water tank comprises a water replenishment pipe for replenishing the cooling water when the cooling water in the cooling water tank is insufficient, a treated water recirculation pipe for reintroducing purified cooling water into the cooling water tank, and a cooling water discharge pipe for supplying the cooling water with a pump and spraying it to the upper part of the main cooling tower.

[0051] According to another embodiment of the present invention, the cooling tower includes a packing part formed within the cooling chamber of the cooling housing part to increase a heat exchange area for secondary cooling of the primary cooled exhaust gas, and the packing part is characterized in that it is a structured packing in which a filler having a certain pattern is structured.

[0052] According to another embodiment of the present invention, the packing part is formed by laminating a plurality of packing layers, or the packing density of each packing layer is different, but the packing density of the packing layer located relatively on the upper side is higher than the packing density of the packing layer located relatively on the lower side.

[0053] According to another embodiment of the present invention, the packing part is characterized in that adjacent packing layers are cross-laminated at a constant angle.

[0054] According to another embodiment of the present invention, the present invention is characterized in that the cooling tower includes a cooling spray unit located above the packing unit and spraying water for secondary cooling of the primary cooled exhaust gas onto the packing unit.

[0055] According to another embodiment of the present invention, the cooling tower includes a demister part located above the cooling spray part to remove mist, the demister part includes a vane part in which a plurality of blades forming an inclined surface are spaced apart to form a gap, and a mesh part in which a plurality of thin and long wires are intertwined to form a gap, and the vane part is located below the mesh part.

[0056] The above-described problem-solving methods are merely exemplary and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, additional embodiments may be included in the drawings and detailed description of the invention.

[0057] The present invention can obtain the following effects through the combination and use of the configuration described above and the following examples.

[0058] The present invention provides an exhaust gas cooler including a pre-cooling tower and a main cooling tower, wherein the pre-cooling tower enables rapid cooling of exhaust gas and removal of foreign substances, and the main cooling tower enables smooth cooling of exhaust gas to a target temperature, and a cooling water tank is integrally formed in a sump of the main cooling housing section so that the related device for exhaust gas cooling does not take up much space, thereby providing an exhaust gas cooler that is easy to install even in ships where securing space is difficult.

[0059] The present invention has the effect of preventing cavitation phenomenon and clogging of gas passage caused by cooling water when a ship rocks by including a sloshing buffer wall that maintains the height of the water surface within the cooling housing.

[0060] In the present invention, the sloshing buffer wall extends from the lower end of the sump section, and can minimize the inflow of cooling water into the interior of the line cooling connection section when the ship is tilted.

[0061] The present invention provides an exhaust gas cooler in which the preset height of the sloshing buffer wall is set so that the height of the water surface within the main cooling housing section is lower than the lower end of the opening formed within the main cooling housing section by the line cooling connection section when the ship is tilted, thereby preventing cooling water from flowing toward the line cooling tower.

[0062] The present invention provides an exhaust gas cooler that can minimize the tower diameter of the cooling tower by forming a packing section with structured packing and reducing the back pressure compared to when the packing section is formed with random packing.

[0063] The present invention provides an exhaust gas cooler in which a sloshing buffer wall has a through hole formed therein so that neighboring subspaces divided by the sloshing buffer wall within the cooling water cooler are in fluid communication.

[0064] The present invention includes a vortex preventer formed of at least one partition plate extending between the inner walls of a coolant outlet to partition the coolant outlet, wherein the sloshing buffer wall and the first partition plate extend on the same plane to adjust the height of the vortex preventer, thereby having the effect of preventing sloshing.

[0065] The present invention can reinforce the diffuser section and supplement the height of the buffer wall by connecting the diffuser plate and the sloshing buffer wall.

[0066] The present invention can discharge upper layer water while maintaining the pressure inside the exhaust gas cooler by forming an overflow pipe.

[0067] The present invention optimizes the installation space and pipe length of pipes connected to a cooling water tank having a structure integrated with a sump.

[0068] The present invention provides an exhaust gas cooler that reduces pressure loss and increases heat exchange area by using structured packing to maximize heat exchange efficiency.

[0069] The present invention provides an exhaust gas cooler in which a plurality of packing layers having different packing densities are formed, and the packing density of a packing layer located relatively higher than that of a packing layer located relatively lower is cross-laminated with each other, thereby increasing the removal rate of foreign substances by a lower packing layer having a lower density and achieving high heat exchange by an upper packing layer having a higher density.

[0070] The present invention can provide an exhaust gas cooler that configures a cooling spray unit that sprays water toward a packing unit on the upper side of the packing unit, thereby performing secondary cooling of the primary cooled exhaust gas and removing foreign substances.

[0071] The present invention has the effect of providing an exhaust gas cooler in which a demister section is formed on the upper side of the cooling injection section, thereby effectively removing moisture accompanying the gas treated at the final stage of the cooling tower.

[0072] The present invention configures a demister unit to prevent equipment connected to the rear side of the cooling tower, such as a turbocharger, from being damaged by moisture.

[0073] The present invention provides an exhaust gas cooler that increases the moisture removal rate by the demister unit and minimizes the impact of moisture on rear-end equipment such as a turbocharger by configuring a demister unit including a vane unit in which a plurality of blades forming an inclined surface are spaced apart to form a gap, and a mesh unit in which a plurality of thin and long wires are intertwined to form a gap on the vane unit.

[0074] The present invention provides a cleaning spray unit configured on the upper side of the demister unit so that water for cleaning is sprayed when the cooler is not in operation, thereby enabling easy cleaning of the device.

[0075] However, the effects that can be obtained from the present invention are not limited to the effects described above, and other effects may exist.

[0076] Figure 1 is a drawing illustrating a conventional exhaust gas recirculation system.

[0077] FIG. 2 is a drawing illustrating an exhaust gas recirculation system according to one embodiment of the present invention.

[0078] Figure 3 is a drawing illustrating an exhaust gas cooler of the present invention.

[0079] Figure 4 is a drawing showing the exhaust gas cooler of Figure 3 from another viewpoint.

[0080] Figure 5 is a drawing showing the exhaust gas cooler of Figure 3 from another viewpoint.

[0081] Figure 6 is a drawing showing the exhaust gas cooler of Figure 3 from another viewpoint.

[0082] Fig. 7 is a drawing showing the exhaust gas cooler of Fig. 3 from another viewpoint.

[0083] Fig. 8 is a drawing showing a partial cut along line A-A' of the exhaust gas cooler of Fig. 3.

[0084] Fig. 9 is a drawing showing a diffuser part of the present invention.

[0085] Fig. 10 is a drawing showing a packing part of the present invention.

[0086] Fig. 11 is a drawing showing the demister part of the present invention.

[0087] FIG. 12 is a drawing showing a cooling water tank, an alkali supply device, a cooling water treatment unit, and a treatment water transport unit integrated into a sump unit of a housing unit according to one embodiment of the present invention.

[0088] FIG. 13 is a drawing showing another embodiment of the present invention in which the coolant tank is separated from the sump portion of the housing portion.

[0089] Figure 14 is a drawing illustrating a cooling water recirculation unit of the present invention.

[0090] Figure 15 is a diagram showing the state of use of the present invention.

[0091] Figure 16 is a diagram showing the state of use of the present invention.

[0092] Figure 17 is a drawing showing the water surface inside a conventional exhaust gas cooler when the ship is not inclined or is inclined.

[0093] FIG. 18 is a drawing showing the water surface formed by water inside an exhaust gas cooler according to one embodiment of the present invention when the ship is not inclined or is inclined.

[0094] Fig. 19 is a cross-sectional view based on a plane perpendicular to the height direction of an exhaust gas cooler according to one embodiment of the present invention.

[0095] FIG. 20 is a cross-sectional view taken along a plane perpendicular to one direction of an exhaust gas cooler according to one embodiment of the present invention.

[0096] Fig. 21 is an enlarged cross-sectional view of the sump portion of Fig. 20.

[0097] FIG. 22 is a cross-sectional view of a sump portion based on a plane perpendicular to another direction of an exhaust gas cooler according to one embodiment of the present invention.

[0098] Hereinafter, preferred embodiments of the exhaust gas recirculation system according to the present invention will be described in detail with reference to the attached drawings. In the following description of the present invention, if a detailed description of a known function or configuration is determined to unnecessarily obscure the gist of the present invention, such detailed description will be omitted. Unless otherwise defined, all terms in this specification have the same general meaning as those skilled in the art to which the present invention pertains. If there is a conflict between the meaning of a term used in this specification and the meaning of the term, the definition used in this specification shall prevail.

[0099] In this specification, cooling water refers to water containing pollutants generated after water is sprayed toward exhaust gas to cool the exhaust gas, and treated water refers to water that has been purified by treating contaminated cooling water.

[0100] In this specification, a location relatively rearward based on the direction in which the fluid flows is expressed as being on the front side, and a location relatively forward based on the direction in which the fluid flows is expressed as being on the rear side.

[0101] The present invention relates to an exhaust gas recirculation system (1), wherein the exhaust gas recirculation system (1) cools exhaust gas discharged from an engine with seawater or fresh water and supplies it back to an engine turbocharger, thereby increasing the concentration of carbon dioxide (CO2) in the turbocharged air to delay self-ignition of fuel, increasing the compression ratio in the cylinder to reduce fuel consumption, and suppressing the production of nitrogen oxides (NOx) through re-combustion of methane slip, lowering the combustion temperature, and reducing the oxygen concentration through exhaust gas recirculation.

[0102] FIG. 2 is a drawing illustrating an exhaust gas recirculation system (1) according to one embodiment of the present invention. Referring to FIG. 2, the exhaust gas recirculation system (1) includes an exhaust gas cooler (10), a cooling water tank (20), an alkali supply device (30), a cooling water treatment unit (40), a treated water transport unit (50), a cooling water recirculation unit (60), and a control unit (70).

[0103] The above exhaust gas cooler (10) refers to a configuration that cools exhaust gas. Referring to FIG. 2, exhaust gas discharged from the engine is received in an exhaust gas receiver, and the exhaust gas discharged from the exhaust gas receiver rotates the turbine at high speed and is discharged through a back pressure valve (BPV, Back Pressure Valve), etc., and some of the exhaust gas may be recovered by a shut-off valve (SOV, Shut-Off Valve), etc., and may enter the exhaust gas cooler (10). The exhaust gas recirculation system (1) cools a portion of the exhaust gas generated when fuel is burned in the engine through the exhaust gas cooler (10), and then mixes it with fuel and reintroduces it into the engine for combustion. According to the exhaust gas recirculation system (1), nitrogen oxides (NOx), etc., contained in the exhaust gas can be reduced.

[0104] FIG. 3 is a drawing showing an exhaust gas cooler (10) of the present invention. Referring to FIG. 3, the exhaust gas cooler (10) includes a line cooling tower (11) and a main cooling tower (12).

[0105] The above-described pre-cooling tower (11) is configured to primarily cool the exhaust gas introduced into the pre-cooling chamber, and rapid cooling of the exhaust gas and removal of foreign substances can be achieved in the pre-cooling tower (11). As described above, after the exhaust gas discharged from the exhaust gas receiver rotates the turbine, a portion of the exhaust gas enters the pre-cooling tower (11). Although not shown in Fig. 2, an economizer may be additionally formed on the front pipe of the pre-cooling tower (11) to generate steam from the waste heat of the exhaust gas and supply the steam to a steam usage location on the ship.

[0106] Referring to FIG. 3, the above-described pre-cooling tower (11) includes a pre-cooling housing section (111), a pre-cooling injection section (112), and a pre-cooling connection section (113).

[0107] The above-described pre-cooling housing part (111) is configured to form a pre-cooling chamber (C1), which is a space capable of receiving exhaust gas therein, and includes an inlet (1111) which is an open upper surface, and the inlet (1111) is communicated with the pre-cooling chamber (C1). The shape of the pre-cooling housing part (111) is not limited to a specific shape, but preferably, as shown in FIG. 3, it may be formed in a cylindrical shape. When a portion of the exhaust gas received in the exhaust gas receiver is recovered after rotating the turbine, the recovered exhaust gas enters the pre-cooling chamber (C1) through the inlet (1111) and is cooled. Referring to FIG. 3, the line cooling housing part (111) may have a cylindrical shape with a constant diameter in a first section from the inlet (1111) to a certain section, but may have a truncated cone shape in which the diameter of the cylinder increases as it goes down in a second section beyond the first section, and may be configured as a cylindrical shape with a maximum diameter in a third section thereafter.

[0108] The above-described pre-cooling spray unit (112) refers to a configuration that sprays water into the chamber to cool the exhaust gas that has entered the pre-cooling chamber (C1) through the inlet (1111). Preferably, the pre-cooling spray unit (112) may be configured in multiple numbers for rapid cooling of the exhaust gas, and as illustrated in FIG. 3, one pre-cooling spray unit (112) may be located in the second section of the pre-cooling housing unit (111), and another pre-cooling spray unit (112) may be located in the third section of the pre-cooling housing unit (111).

[0109] The above-described pre-cooling connection part (113) refers to a configuration that connects the pre-cooling housing part (111) and the main cooling tower (12) to be described later. The pre-cooling connection part (113) forms a connection chamber (C2) therein, and exhaust gas cooled while passing through the pre-cooling housing part (111), water used to cool the exhaust gas, etc. can enter the main cooling chamber (C3) of the main cooling housing part (121) to be described later through the connection chamber (C2). The shape of the pre-cooling connection part (113) is not limited to a specific shape, but preferably, as illustrated in FIG. 3, it can be formed in a shape in which the cross-sectional size becomes smaller as it goes downward.

[0110] Referring to FIGS. 3 and 4, the above-described line cooling connection (113) includes a first connection surface (1131), a second connection surface (1132), and a third connection surface (1133).

[0111] The above first connecting surface (1131) is a portion that forms a substantially vertical surface as illustrated in FIG. 4, and guides exhaust gas, etc., within the line cooling chamber (C1) of the line cooling housing section (111) to move downward.

[0112] The second connecting surface (1132) is a portion formed to extend from the end of the first connecting surface (1131), and has the characteristic of being formed to be inclined so that the direction of extension is toward the central axis (Ab) of the body portion (1211) to be described later, as illustrated in FIG. 4. The first cooled exhaust gas, etc. guided downward through the first connecting surface (1131) by the second connecting surface (1132) forming the inclined surface can naturally move into the main cooling chamber (C3) of the main cooling housing portion (121) to be described later, while being guided by the second connecting surface (1132).

[0113] The third connecting surface (1133) refers to a portion that extends approximately horizontally from the end of the second connecting surface (1132). The first-cooled exhaust gas, etc. can be guided by the third connecting surface (1133) and introduced into the cooling chamber (C3) of the cooling housing section (121).

[0114] The above main cooling tower (12) is configured to secondarily cool the exhaust gas that has been primarily cooled by being connected to the line cooling tower (11), so that the exhaust gas can be smoothly cooled to a target temperature in the main cooling tower (12). In addition, water and various pollutants sprayed in the line cooling tower (11) to first cool the exhaust gas can also flow from the line cooling tower (11) to the main cooling tower (12) and be collected in the sump, which is the lowest part of the main cooling tower (12). Preferably, the main cooling tower (12) can be configured to have a larger volume than the line cooling tower (11). The main cooling tower (12) includes a main cooling housing part (121), a diffuser part (122), a packing part (123), a main cooling spray part (124), a demister part (125), a cleaning spray part (126), and an outlet part (127).

[0115] The above cooling housing part (121) is configured to form a cooling chamber (C3) therein, and the shape of the above cooling housing part (121) is not limited to a specific shape, but preferably, the above cooling housing part (121) may be configured to have a shape in which the upper part becomes narrower as it goes up for smooth discharge of exhaust gas, as shown in FIG. 4, and a shape in which the lower part becomes narrower as it goes down for smooth discharge of coolant. Referring to FIG. 4, the above cooling housing part (121) includes a body part (1211), a head part (1212), and a sump part (1213).

[0116] The above body part (1211) is configured to form the body of the above cooling housing part (121), and may be formed in a cylindrical shape with an upper surface and a lower surface open while forming a chamber inside. The cross-sectional shape of the body part (1211) may be configured in various shapes such as circular or non-circular, but in order to increase space efficiency, it may be preferable to be configured to have a rectangular cross-sectional shape, as illustrated in FIGS. 3 and 4.

[0117] The above head portion (1212) is configured to extend upward from the body portion (1211) while communicating with the internal chamber of the body portion (1211), and refers to a portion where exhaust gas that has completed secondary cooling and moisture removal finally gathers. The shape of the head portion (1212) is not limited to a specific shape, but preferably, as shown in FIGS. 4 to 7, it may be configured to have a shape in which the cross-sectional size becomes smaller as it goes upward. The head portion (1212) includes a first surface (12121), a second surface (12122), a third surface (12123), a fourth surface (12124), and a roof surface (12125).

[0118] The first surface (12121) above refers to a surface forming the head portion (1212) on which the outlet portion (127), which will be described later, is formed. Referring to FIG. 4, the first surface (12121) may be configured to have an approximately triangular shape. Preferably, the first surface (12121) may be formed to be inclined in the direction of the central axis (Ab) of the body portion (1211), as illustrated in FIG. 5. The present invention allows the outlet portion (127) formed on the first surface (12121) to be inclined upward with respect to an axis perpendicular to the central axis (Ab) of the body portion, thereby discharging the treated exhaust gas in a state in which the outlet portion (127) is inclined upward, so that even if water is generated due to condensation in an environment with a low external temperature such as winter, the condensed water enters the main cooling chamber of the cooling tower.

[0119] The second surface (12122) is formed on the other side of the first surface (12121), and referring to FIG. 6, the second surface (12122) may also be formed to have a roughly triangular shape, similar to the shape of the first surface (12121). Preferably, the second surface (12122) may be formed to be inclined toward the central axis (Ab) of the body portion so that the treated exhaust gas can move while minimizing pressure loss. More preferably, the inclined angle (θ1) of the first surface (12121) may be configured to be smaller than the inclined angle (θ2) of the second surface (12122) with respect to the central axis (Ab) of the body portion (θ1<θ2). As a result, this configuration causes the second surface (12122) to be more inclined toward the central axis (Ab) of the body portion than the first surface (12121), as shown in FIG. 5, so that the exhaust gas that has undergone secondary cooling and moisture removal in the chamber of the body portion (1211) can naturally move toward the outlet portion (127) described later without pressure loss.

[0120] The third surface (12123) is formed on the side where the cooling tower (11) is located, as illustrated in FIG. 6, and refers to a configuration in which the surface is inclined toward the central axis (Ab) of the body portion (1211). The shape of the third surface (12123) is not limited to a specific shape, but may preferably be configured to have an approximately trapezoidal shape. Referring to FIG. 6, the inclined angle of the third surface (12123) with respect to the central axis (Ab) of the body portion may be θ3, and the inclined angle of the third surface (12123) may be configured to be the same as the inclined angle of the fourth surface (12124) described below.

[0121] The fourth surface (12124) is formed on the other side of the third surface (12123) and refers to a configuration that forms a surface inclined in the direction of the central axis (Ab) of the body portion (1211). Preferably, with respect to the central axis (Ab) of the body portion, the inclined angle (θ3) of the third surface (12123) may be configured to be the same as the inclined angle (θ4) of the fourth surface (12124) (θ3=θ4). The present invention has a head portion (1212) having a third surface (12123) located on the cooling tower (11) side and an opposite surface, the fourth surface (12124), which are inclined at the same inclination angle toward the central axis (Ab) of the body portion, so that the head portion (1212) of the cooling housing portion (121) has a shape in which the cross-sectional area gradually narrows toward the upper side, thereby naturally moving the treated exhaust gas toward the outlet (127) while minimizing the pressure loss of the treated exhaust gas. The fourth surface (12124) may be configured to have an approximately trapezoidal shape, similar to the third surface (12123).

[0122] The above loop surface (12125) is configured to form the uppermost surface of the head portion (1212), as shown in FIGS. 6 and 7, and the loop surface (12125) may be formed to be rounded along the outer circumference of the outlet portion (127) to be described later. The present invention configures the loop surface (12125) on the head portion (1212) to guide the smooth movement of the treated exhaust gas.

[0123] The above sump part (1213) refers to the part located at the lowest point of the main cooling housing part (121), and as illustrated in FIG. 8, the sump part (1213) may be configured in a hopper shape that becomes narrower toward the bottom while forming a slope for easy discharge of coolant, contaminants, etc. The coolant tank (20) to be described later may be configured within the main cooling housing part (121) using the sump part (1213). That is, the wall of the sump part (1213) may be utilized as the wall of the coolant tank (20), or the wall of the coolant tank (20) may be configured separately within the wall of the sump part (1213). When forming a cooling water tank (20) by utilizing the above sump section (1213), a lot of space can be saved compared to when the cooling water tank (20) is configured separately outside the above cooling housing section (121), so it is useful when installing an exhaust gas recirculation system in a narrow space such as a ship. Referring to Fig. 8, the above sump section (1213) includes a cooling water outlet section (12131).

[0124] The above-described coolant outlet (12131) is formed on the lower side of the sump portion (1213) and refers to a configuration that discharges coolant, etc. collected in the sump portion (1213) to the outside. As illustrated in FIG. 6, the coolant outlet (12131) may be formed parallel to the central axis (Ab) of the body portion (1211). According to one embodiment of the present invention, when the coolant tank (20) to be described later is formed within the sump portion (1213), the coolant outlet (12131) communicates with the internal space of the coolant tank (20). According to another embodiment of the present invention, when the coolant tank (20) to be described later is formed outside the sump portion (1213), the coolant outlet (12131) may be viewed as a configuration that discharges coolant, etc. collected in the sump portion (1213) to the outside and moves it into the coolant tank (20).

[0125] The above diffuser part (122) refers to a configuration formed within the cooling chamber so that the exhaust gas that has been primarily cooled in the pre-cooling tower (11) is uniformly distributed to the packing part (123), which will be described later and increases the heat exchange area for secondary cooling. The present invention configures the diffuser part (122) below the packing part (123), so that when the exhaust gas that has been primarily cooled in the pre-cooling tower (11) enters the cooling chamber of the pre-cooling tower (12), it is uniformly distributed to the packing part (123) while passing through the diffuser part (122). FIG. 8 is a drawing showing a partial cross-section of the exhaust gas cooler (10) of FIG. 3 along line A-A', and referring to FIG. 8, the diffuser part (122) includes a diffusion plate (1221) and a support part (1222).

[0126] The above diffusion plate (1221) refers to a plate-shaped configuration including a plurality of through holes (12211) penetrating one surface and the other surface. The diffusion plate (1221) allows the primary cooled exhaust gas to pass through the diffusion plate (1221) through the through holes (12211), and through this process, allows the primary cooled exhaust gas to uniformly enter the packing unit (123) to be described later. To this end, as shown in FIGS. 8 and 9, a plurality of diffusion plates (1221) may be arranged at regular intervals, and preferably, the diffusion plates (1221) may be arranged in a stepwise manner so that they are positioned lower on the cooling housing unit (121) as they get farther away from the pre-cooling connection unit (113).

[0127] The above support member (1222) refers to a configuration in which the diffusion plate (1221) closer to the central axis (Ab) of the body part (1211) is positioned relatively lower than the cooling housing part (121) while maintaining a constant distance between the diffusion plates (1221). The diffuser member (122) is positioned relatively lower than the cooling housing part (121) while maintaining a constant distance between adjacent diffusion plates (1221) through the support member (1222), thereby evenly spreading the primary cooled exhaust gas within the cooling chamber and preventing the exhaust gas from being concentrated only in a specific part of the packing member (123) described later. Preferably, the support member (1222) may be configured to support the upper and lower sides of a plurality of diffuser plates (1221) in pairs, as shown in FIGS. 8 and 9.

[0128] The above packing part (123) refers to a configuration formed in the main cooling chamber of the main cooling housing part (121) to increase the heat exchange area for secondary cooling of the primary cooled exhaust gas. The present invention configures the packing part (123) in the main cooling chamber of the main cooling tower (12) to increase the contact area between the water used for exhaust gas cooling and the exhaust gas in the process of secondary cooling the exhaust gas that was primary cooled in the pre-cooling tower (11), thereby increasing the heat exchange rate and ensuring good cooling of the exhaust gas. Preferably, the packing part (123) is characterized by being a structured packing in which a filler having a certain pattern is structured. The present invention forms a packing section (123) with structured packing, thereby minimizing the tower diameter of the cooling tower by reducing the back pressure compared to when the packing section is formed with random packing, and by using structured packing, pressure loss is reduced and heat exchange area is increased to maximize heat exchange efficiency.

[0129] The above packing part (123) can be formed by stacking a plurality of packing layers, and the filling density of each packing layer can be configured differently. Preferably, the packing part (123) is characterized in that the filling density of the packing layer located relatively upper is higher than the filling density of the packing layer located relatively lower, and the adjacent packing layers can be cross-stacked at a certain angle. That is, the present invention forms a plurality of packing layers having different filling densities for each packing layer, and cross-stacks the adjacent packing layers while making the filling density of the packing layer located relatively upper is higher than the filling density of the packing layer located relatively lower, thereby increasing the removal rate of foreign substances by the lower packing layer having a low density, and achieving high heat exchange by the upper patching layer having a high density.

[0130] Referring to FIGS. 8 and 10, the packing portion (123) includes a first packing layer (1231), a second packing layer (1232), a third packing layer (1233), and a fourth packing layer (1234).

[0131] The first packing layer (1231) is configured to form the lowest layer among the packing sections (123), and the filling density of the first packing layer (1231) can be configured to be the lowest relative to other packing layers.

[0132] The second packing layer (1232) is configured to be formed on the first packing layer (1231), and the second packing layer (1232) is cross-laminated with the first packing layer (1231). As shown in FIG. 10, the second packing layer (1232) is configured to have a higher density than the filling density of the first packing layer (1231).

[0133] The third packing layer (1233) is formed on the second packing layer (1232), and is configured to be cross-laminated with the second packing layer (1232). In addition, the third packing layer (1233) may have a higher density than the filling density of the second packing layer (1232).

[0134] The fourth packing layer (1234) is configured to be formed on the third packing layer (1233), and the fourth packing layer (1234) can be formed to be cross-laminated with the third packing layer (1233). It is preferable that the filling density of the fourth packing layer (1234) be formed higher than the filling density of the third packing layer (1233).

[0135] The above cooling spray unit (124), as illustrated in FIG. 8, is located above the packing unit (123) and is configured to spray water for secondary cooling of the primary cooled exhaust gas onto the packing unit (123). Through this, not only secondary cooling of the primary cooled exhaust gas but also removal of foreign substances can be achieved simultaneously.

[0136] The above demister unit (125) refers to a configuration that is located above the main cooling spray unit (124) and removes mist. Equipment such as an engine turbocharger is connected to the rear side of the main cooling tower (12). If moisture enters this equipment, various problems such as corrosion may occur. Therefore, the present invention configures the demister unit (125) so that moisture accompanying the gas processed at the final stage of the main cooling tower (12) is effectively removed, thereby preventing damage caused by the moisture. Referring to Fig. 11, the demister unit (125) includes a vane unit (1251) and a mesh unit (1252).

[0137] The above-mentioned vane portion (1251) refers to a configuration in which a plurality of blades forming an inclined surface are spaced apart to form a gap. The demister portion (125) of the present invention can be formed by combining the vane portion (1251) and a mesh portion (1252) to be described later, and the vane portion (1251) is configured to be positioned relatively lower than the mesh portion (1252) to be described later, thereby primarily performing the function of removing moisture.

[0138] The above mesh portion (1252) refers to a configuration in which a plurality of thin and long wires are intertwined to form a gap. The gap of the mesh portion (1252) is formed smaller than the gap of the vane portion (1251), and the vane portion (1251) is positioned below the mesh portion (1252). The mesh portion (1252) can be viewed as a configuration in which moisture is removed secondarily after moisture is primarily removed by the vane portion (1251). The present invention configures the demister portion (125) to include both the vane portion (1251) and the mesh portion (1252), thereby increasing the moisture removal rate by the demister portion (125) and minimizing the impact of moisture on subsequent equipment such as a turbocharger.

[0139] The above-described cleaning spray unit (126) is configured to spray water for cleaning onto the demister unit (125) by being positioned above the demister unit (125), as illustrated in FIG. 8. Preferably, the cleaning spray unit (126) may be formed on the head unit (1212). The present invention enables easy cleaning of the device by spraying water for cleaning via the cleaning spray unit (126) when the exhaust gas cooler (10) is not in operation.

[0140] The above-described outlet (127) is configured to discharge the treated exhaust gas to the outside, and is characterized in that the outlet (127) is formed at a point that minimizes the connection line with the engine turbocharger that receives the treated exhaust gas. Preferably, the outlet (127) may be formed on the side surface of the head portion (1212) so that the central axis (Ao) of the outlet portion is not parallel to the central axis (Ab) of the body portion. When the outlet (127) is formed on the side surface of the head portion (1212), since the central axis (Ao) of the outlet portion is not parallel to the central axis (Ab) of the body portion, there is no need to change the flow path using a pipe elbow or the like, and the length of the pipe connecting the outlet (127) and the turbocharger can be reduced, thereby solving the problem of back pressure formation that occurs when the length of the pipe becomes long, and preventing the pressure drop phenomenon. Referring to Fig. 5, more preferably, the outlet (127) can be formed such that the central axis (Ao) of the outlet is parallel to the normal line of the first surface (12121). In addition, the present invention allows the outlet (127) to discharge exhaust gas upward only by forming a vertically protruding outlet on the first surface (12121) formed to be inclined in the direction of the central axis (Ab) of the body portion so that the central axis (Ao) of the outlet (127) is parallel to the normal line of the first surface (12121).

[0141] The above cooling water tank (20) refers to a configuration that stores cooling water discharged from the exhaust gas cooler (10) after cooling the exhaust gas. FIG. 12 illustrates an embodiment in which the cooling water tank (20) is integrated into the sump portion (1213) of the cooling housing portion (121), and FIG. 13 illustrates an embodiment in which, unlike FIG. 12, the cooling water tank (20) is configured separately from the cooling housing portion (121). Although the present invention does not exclude an embodiment in which the cooling water tank (20) is separated from the cooling housing portion (121), preferably, the cooling water tank (20) may be formed integrally with the sump portion (1213) of the cooling housing portion (121). The present invention forms the cooling water tank (20) integrally with the sump of the cooling housing section (121), so that the related device for exhaust gas cooling does not take up much space, thereby enabling easy installation of the exhaust gas recirculation system even in ships where securing space is difficult. In addition, the present invention treats cooling water exceeding the standard water quality and reintroduces it into the cooling water tank (20), thereby allowing the cooling water stored in the cooling water tank (20) to always maintain a constant water quality.

[0142] The above alkali supply device (30) is configured to supply a pH adjuster to the cooling water, and by supplying the pH adjuster to adjust the pH of the cooling water, it is possible to prevent the cooling water from becoming acidic due to sulfur components contained in fuel, acid gases in exhaust gas, etc. Preferably, sodium hydroxide (NaOH) can be used as the pH adjuster. Referring to FIG. 12, the alkali supply device (30) can be connected to a static mixer (42) to be described later and supply the sodium hydroxide (NaOH) to the static mixer (42), and referring to FIG. 14, the alkali supply device (30) can be configured to supply the sodium hydroxide (NaOH) to the cooling water, which is discharged from the cooling water tank (20) and has a certain water quality level maintained thereon.

[0143] The above cooling water treatment unit (40) refers to a configuration that treats the cooling water stored in the cooling water tank (20). When water is sprayed to cool exhaust gas, the water that falls after spraying may contain various contaminants. If the concentration of such contaminants satisfies a predetermined water quality measurement standard, the discharged cooling water can be reused. However, if the concentration of contaminants is high and does not satisfy the water quality measurement standard, the cooling water cannot be reused. Therefore, in this case, it is necessary to treat the contaminated cooling water that has exceeded a certain water quality level. Accordingly, the present invention configures the cooling water treatment unit (40) to purify the cooling water that does not satisfy the water quality standard by overflowing it, and then transfer it back to the cooling water tank (20). Referring to FIG. 12, the cooling water treatment unit (40) includes an overflow transfer pipe (41), a static mixer (42), a holding tank (43), and a water treatment device (44).

[0144] The above overflow transfer pipe (41) refers to a pipe that transfers overflowed cooling water exceeding a standard water quality from the cooling water tank (20). Preferably, the standard water quality may be based on the concentration of total suspended solids (TSS). Based on the concentration of the total suspended solids (TSS), the overflowed cooling water that does not meet the standard water quality requirement is transferred to a water treatment device (44) to be described later through the overflow transfer pipe (41). The above overflow transfer pipe (41) includes an overflow valve (411).

[0145] The above overflow valve (411) is formed on the overflow transport pipe (41) to close or open the inside of the pipe. When it is determined that the water quality of the cooling water tank (20) does not meet the standard water quality, the control unit (70) to be described later opens the overflow valve (411) so that the cooling water is transported along the overflow transport pipe (41) toward the water treatment device (44) to be described later. Conversely, when it is determined that the water quality of the cooling water tank (20) meets the standard water quality, the overflow valve (411) is maintained in a closed state, and the cooling water stored in the cooling water tank (20) can be recirculated through the cooling water recirculation unit (60) to be described later.

[0146] The above static mixer (42) is formed on the overflow transfer pipe (41) in front of the holding tank (43) described later, and refers to a configuration that mixes a pH adjuster into the cooling water. For this purpose, the static mixer (42) can be connected to the alkali supply device (30). The present invention prevents the cooling water from becoming acidic due to sulfur components contained in fuel, acid gases in exhaust gas, etc., through the static mixer (42).

[0147] The above holding tank (43) refers to a configuration that functions as a buffer tank that is connected to the overflow transfer pipe (41) and temporarily stores the overflowed cooling water that exceeds the reference water quality. The present invention configures the holding tank (43) that temporarily stores the overflowed cooling water that exceeds the reference water quality in front of the water treatment device (44) described later, thereby preventing frequent operation (On) / stop (Off) of the water treatment device (44) by ensuring that the cooling water is constantly supplied to the water treatment device (44). In addition, the treated water is discharged overboard in an amount equivalent to the amount of exhaust gas condensate generated, so that the water level of the holding tank (43) can be constantly maintained. Since the amount of condensate generated varies depending on the amount of exhaust gas recirculation, the moisture content of the exhaust gas inlet, the cooling temperature of the exhaust gas outlet, the humidity of the installation location, etc. and cannot be accurately determined, three to four conditions can be set according to the amount of circulation and corrected according to the changing water level to maintain an appropriate water level.

[0148] Referring to Fig. 12, the static mixer (42) is configured on the front side of the holding tank (43), and it can be seen that the cooling water in which the pH adjuster is stirred enters the holding tank (43) through the static mixer (42). Referring to Fig. 13, when the end of the transfer pipe that transfers the cooling water discharged from the static mixer (42) is formed so deep that it reaches the bottom surface of the holding tank (43), a gas backflow situation may occur, so the present invention does not configure a deep pipe in which the end of the transfer pipe is formed so deep that it reaches the bottom surface of the holding tank (43), and does not fill the overflow transfer pipe (41) connecting the cooling water tank (20) and the static mixer (42) with water, thereby preventing the gas from being discharged through the vent and causing the gas to backflow.

[0149] The above water treatment device (44), as illustrated in FIG. 12, is connected to the holding tank (43) and is configured to treat overflowed cooling water that exceeds the standard water quality supplied from the holding tank (43) and discharge the treated water. The present invention treats the cooling water discharged after cooling exhaust gas by the water treatment device (44), so that the treated water can be re-supplied to the cooling water tank (20). In order to continuously supply an appropriate amount to the cooling water tank (20), the re-injection flow rate can be determined through a flow meter (52) and a throttle valve (53) described later before discharging the treated water.

[0150] The above-mentioned treated water transport unit (50) refers to a configuration that receives and transports treated water, which is cooling water treated from the above-mentioned cooling water treatment unit (40). Preferably, when cooling the exhaust gas, moisture in the gas condenses along with the cooling, thereby increasing the amount of cooling water. Therefore, if the amount of condensed water generated is large, the flow rate of treated water reinjected into the cooling water tank (20) can be reduced, and conversely, if the amount of condensed water generated is small, the flow rate of treated water reinjected into the cooling water tank (20) can be increased. Referring to FIG. 12, the above-mentioned treated water transport unit (50) includes a treated water transport pipe (51), a flow meter (52), a throttle valve (53), a cooling water tank return pipe (54), and a holding tank return pipe (55).

[0151] The above-mentioned treated water transport pipe (51) refers to a pipe for transporting the treated water, and a portion of the treated water treated in the water treatment device (44) can be reintroduced into the cooling water tank (20), and the remaining treated water can be discharged overboard, or, if the ship passes through an area where discharge of treated water overboard is prohibited, the treated water can be stored in a temporary storage tank. The manager can control, through the control unit (70) described below, whether to discharge the treated water overboard or temporarily store it onboard, depending on whether it is a discharge-regulated area.

[0152] The above flow meter (52) is formed at the rear side of the point where the cooling water tank return pipe (54) among the treated water transfer pipes (51) is connected to the treated water transfer pipe (51) so that the return water flow rate returned to the cooling water tank (20) is precisely controlled, and refers to a configuration that measures the flow rate inside the treated water transfer pipe (51). The present invention configures the flow meter (52) at the rear side of the water treatment device (44), and sequentially installs a throttle valve (53) to be described later at the rear side of the flow meter (52), so that a portion of the treated water is returned to the cooling water tank (20), and the remainder is discharged overboard, so that this process can occur continuously.

[0153] The above throttle valve (53) refers to a configuration formed on the treated water transport pipe (51) at the rear side of the flow meter (52) to control the flow rate. The present invention uses the throttle valve (53) instead of using a three-way valve that allows a large range of flow rate fluctuations, so that the flow rate of the treated water recirculated into the cooling water tank (20) can be precisely controlled. This allows the flow rate of the treated water recirculated into the cooling water tank to be flexibly adjusted according to changes in engine load, seawater temperature, etc., thereby increasing efficiency. Preferably, the throttle valve (53) is characterized in that it determines the return flow rate (ab) that is reintroduced into the cooling water tank (20) as the value obtained by subtracting the flow rate (b) discharged overboard from the capacity (a) of the water treatment device that treats the overflowed cooling water exceeding the standard water quality. By determining the amount of water discharged overboard from the capacity of the water treatment device (44) minus the amount of water discharged overboard by the above throttle valve (53), as the amount of water returned to the cooling water tank (20), efficient operation of the system can be achieved through precise control of the throttle valve (53).

[0154] The above cooling water tank return pipe (54) is configured to return a portion of the treated water to the cooling water tank (20), and is configured such that one side is connected to the treated water transfer pipe (51) and the other side is connected to the cooling water tank (20). The cooling water tank return pipe (54) includes a first return valve (541) and a second return valve (542).

[0155] The above first return valve (541) refers to a valve formed on the side of the treated water transport pipe (51) among the return pipes (54) of the cooling water tank. As described above, if the value obtained by subtracting the flow rate discharged overboard from the capacity of the water treatment device (44) is determined as the reintroduction flow rate, when the first return valve (541) is opened before the discharge of the treated water, the determined reintroduction flow rate is returned to the cooling water tank (20).

[0156] The above second water recovery valve (542) refers to a valve formed on the cooling water tank (20) side of the cooling water tank water recovery pipe (54). Since the treated water to be recovered is treated clean water, by opening the second water recovery valve (542) and supplying the treated water into the cooling water tank (20), the contaminated water can be diluted to adjust the water quality of the cooling water tank (20) to a certain level.

[0157] The above holding tank return pipe (55) is configured such that one side is connected to the water treatment device (44), and the other side is connected to a holding tank (43) that temporarily stores overflowed cooling water exceeding the standard water quality, thereby returning the treated water discharged from the water treatment device (44) to the holding tank (43). Treated water that does not meet the appropriate requirements can be returned to the holding tank (43) through the holding tank return pipe (55).

[0158] The above-described cooling water recirculation unit (60) refers to a configuration that recirculates cooling water that satisfies the standard water quality stored in the cooling water tank (20). As described above, if the water quality of the cooling water tank (20) does not satisfy the standard water quality, the cooling water overflows, and the overflowed cooling water is treated and the purified treated water is returned to the cooling water tank (20), so that the water quality of the cooling water tank (20) can be maintained at a certain level. The present invention configures the cooling water recirculation unit (60) to discharge cooling water that satisfies the standard water quality from the cooling water tank (20), so that the discharged cooling water can be used again as water for cooling exhaust gas. Referring to FIG. 14, the cooling water recirculation unit (60) includes a cooling water transfer pipe (61) and a heat exchanger (62).

[0159] The above cooling water transport pipe (61) refers to a pipe that is connected to the cooling water tank (20) and transports cooling water that satisfies the standard water quality. Preferably, as shown in FIG. 14, a pH adjuster provided from the alkaline supply device (30) can be injected onto the cooling water transport pipe (61), and the pH of the cooling water that satisfies the standard water quality can be adjusted by the pH adjuster.

[0160] The above heat exchanger (62) refers to a configuration formed on the cooling water transport pipe (61) to cool the cooling water whose temperature has increased due to the cooling of the exhaust gas. That is, the present invention configures the heat exchanger (62) on the cooling water transport pipe (61) through which cooling water satisfying the standard water quality is transported, so that the cooling water whose temperature has increased during the process of cooling the exhaust gas can be re-cooled using seawater or the like so that it can be reused for cooling the exhaust gas. Preferably, the heat exchanger (62) may be formed as a plate-type heat exchanger in order to increase the heat exchange efficiency during the heat exchange process.

[0161] The above control unit (70) is configured to control the exhaust gas recirculation system (1), and collects and monitors data while communicating with the components included in the exhaust gas recirculation system (1), and can determine whether to open or close a valve, operate or stop a device, etc. based on the collected data.

[0162] FIG. 15 and FIG. 16 are diagrams showing the state of use of the present invention. As shown in FIG. 15 and FIG. 16, the exhaust gas cooler (10) of the present invention can be directly attached to an engine (E), so that the exhaust gas cooler (10) can be easily installed even in places with many restrictions on installation space, such as ships.

[0163] And the present invention configures a pre-cooling tower (11) in front of the main cooling tower (12), so that primary exhaust gas cooling is achieved by the pre-cooling spray unit (112) that sprays water into the pre-cooling tower (11). The primary cooled exhaust gas enters the main cooling tower (12) through the pre-cooling connection unit (113), and the primary cooled exhaust gas by the water sprayed from the main cooling spray unit (124) is secondarily cooled.

[0164] The exhaust gas cooled within the above body portion (1211) rises and flows into the head portion (1212). By making the head portion (1212) have a unique shape as shown in FIGS. 15 and 16, the exhaust gas that has undergone secondary cooling and moisture removal can naturally move toward the outlet portion (127) without pressure loss.

[0165] The present invention forms the outlet (127) on the side of the head (1212) instead of forming the outlet (127) on the upper surface of the head (1212), so that the use of a pipe elbow or the like for changing the flow path is not necessary, thereby reducing the length of the pipe connecting the outlet (127) and the turbocharger, thereby solving the problem of back pressure formation and preventing the pressure drop phenomenon.

[0166] In particular, since the first surface (12121) of the head portion (1212) is formed to be inclined as illustrated in FIG. 16, the outlet portion (127) coupled to the first surface (12121) discharges the treated exhaust gas in a state inclined upward, and even if water is generated due to condensation in an environment with low external temperature such as winter due to the inclined outlet portion (127), the condensed water can enter the main cooling chamber of the cooling tower.

[0167] The water sprayed for exhaust gas cooling is collected in the sump, which is the lowest point of the above-mentioned cooling housing section (121), and the cooling water tank (20) can be formed integrally with the sump section (1213) to increase space efficiency. If the cooling water stored in the cooling water tank (20) does not satisfy the standard water quality, the overflowed cooling water can be treated and reinjected, and the cooling water satisfying the standard water quality can be discharged and re-cooled to be recycled for exhaust gas cooling.

[0168] Referring to Fig. 17, a conventional exhaust gas cooler has a main cooling tower (911) and a main cooling tower (912) interconnected. When a conventional exhaust gas cooler is installed on a ship, when the ship tilts, the water level (H) collected in the main cooling tower (912) changes according to the tilt angle of the ship (Ht).

[0169] Typically, the engine is installed along the longitudinal direction of the ship, and the exhaust gas cooler is installed along the transverse direction perpendicular thereto. That is, it can be understood that the line cooling tower (911) and the main cooling tower (912) are arranged along the transverse direction of the ship. When the ship rolls laterally, it has a maximum inclination of 22.5 degrees. As the ship tilts, the water accumulated in the main cooling tower flows into the line cooling tower (Ht), which causes a problem of blocking the exhaust gas flow path of the line cooling tower. In addition, a vortex is generated due to the fluctuation of the cooling water, and the durability of the pump at the rear end of the exhaust gas cooler is reduced due to the cavitation phenomenon.

[0170] An exhaust gas cooler (10) according to an embodiment of the present invention illustrated in FIG. 18 is mounted on a ship and is a component of an exhaust gas recirculation system that cools exhaust gas discharged from an engine and supplies it back to the engine, effectively maintaining the level of cooling water in the cooling tower (12) and minimizing the generation of vortexes and bubbles in the cooling water due to the movement of the ship. This exhaust gas cooler (10) forms a cooling water tank that stores the cooling water discharged after cooling the exhaust gas integrally in the sump portion (1213) of the cooling housing portion (121), forms a sloshing buffer wall (12132) to prevent rapid movement of the cooling water, and optimizes the cooling water outlet portion (12131) through the vortex-absorbing base (12133), thereby maintaining the durability of the pump located at the rear end when the cooling water is discharged.

[0171] The sump (1213) includes a cooling water outlet (12131) opened toward the lower side of the sump as described above, but may additionally include a sloshing buffer wall (12132), a vortex preventer (12133), and an overflow pipe (12134).

[0172] Meanwhile, the pump located at the rear end of the sump unit (1213) can operate at regular intervals to transport cooling water inside the exhaust gas cooler (10). Depending on the operation of the pump, the cooling water in the cooling water tank integrated into the sump unit (1213) can be discharged outside the exhaust gas cooler (10). That is, when the pump is not operating, the cooling water is stored while maintaining a certain level inside the exhaust gas cooler (10), and when the pump is operating, it can be circulated inside the exhaust gas cooling tower. This does not exclude the cooling water from being discharged outside the exhaust gas cooling tower when the pump is operating.

[0173] The operation of the pump can be controlled based on the temperature of the exhaust gas in the exhaust gas cooler and the flow rate of the cooling water injected from the injection unit. The cooling water is transferred to the upper part of the exhaust gas cooling tower by the pump, injected through the cooling injection unit, and the temperature of the exhaust gas is cooled. During the circulation process of the exhaust gas through the pump in the cooling tower, the level of the cooling water in the sump unit (1213) can be controlled within a predetermined range. At this time, the predetermined range can be such that the amount of cooling water stored in the sump unit is greater than the amount of cooling water that does not cause problems such as cavitation or cannot be transferred by the pump, and is less than the height of the cooling water at which the cooling water flows into the inside of the pre-cooling connection unit.

[0174] Referring to FIGS. 18 to 22, a sloshing buffer wall (12132) may be provided to maintain the height of the water surface within the cooling housing section (121) when the vessel is tilted. In one embodiment, the sloshing buffer wall (12132) may extend in a first direction from one inner wall of the cooling water tank or sump section to the other inner wall. At this time, the first direction in which the sloshing buffer wall extends may be perpendicular to a direction in which the angle of the vessel's rolling reference is large.

[0175] For example, when the maximum sway standard during ship design is 22.5 degrees in the transverse direction and 7.5 degrees in the longitudinal direction, the first direction, which is the extension direction of the sloshing buffer wall (12132), may be the longitudinal direction perpendicular to the transverse direction. Since the transverse sway is greater when the ship is operating, the sloshing buffer wall (12132) minimizes the change in the water surface within the cooling tower (12) by reducing the transverse sway length within the cooling housing section (121). In one embodiment, the first direction may be perpendicular to the extension direction of the line cooling tower (11) and the main cooling tower (12). In other words, when the line cooling tower (11) and the main cooling tower (12) are arranged along the transverse direction of the ship, the sloshing buffer wall may extend along the longitudinal direction of the ship perpendicular thereto.

[0176] The sloshing buffer wall (12132) may extend from the bottom of the sump section to minimize the inflow of cooling water into the interior of the line cooling connection section when the vessel is tilted.

[0177] In one embodiment, the sloshing buffer wall (12132) may extend from the bottom of the sump portion (1213) to a preset height of the main cooling housing portion (121). The preset height may be a height that prevents cooling water within the main cooling housing portion (121) from flowing into the line cooling connection portion (113) when the vessel is heeled. Referring to FIG. 18, the preset height may be set such that when the vessel is heeled, the height (Ht) of the water surface within the main cooling housing portion is positioned lower than the bottom of the opening formed within the main cooling housing portion by the line cooling connection portion (113). More specifically, when the vessel is heeled, the height (Ht) of the water surface within the main cooling housing portion may be positioned lower than the third connection surface (1133).

[0178] In one embodiment, the sloshing buffer wall (12132) may be determined to have a position and height such that the product of the distance from the sloshing buffer wall (12132) in the second direction perpendicular to the first direction in which the line cooling connection (113) is formed and the tangent value of the transverse sway reference angle is added to the set water surface height (H) within the cooling housing unit (121) is less than the height to the bottom of the opening formed within the cooling housing unit.

[0179] In addition, a through hole (12132a) may be formed in the sloshing buffer wall (12132) to allow fluid communication between neighboring subspaces divided by the sloshing buffer wall within the coolant tank. As illustrated in FIG. 22, the through hole (12132a) may be formed close to the inner wall of the sump and may have a circular shape divided by the inner wall, but may also be formed apart from the inner wall of the sump. The shape of the through hole (12132a) may be a circle or a divided circle, but is not limited thereto, and it is sufficient as long as it is formed to allow coolant to communicate.

[0180] Referring to FIGS. 18 to 20, the sloshing buffer wall (12132) is connected to one of the diffuser plates (1221) of the diffuser part (122) to reinforce the diffuser part (122) and at the same time reinforce the height of the sloshing buffer wall (12132). The diffuser part (1222) of the present invention may be arranged so that the diffuser plate (1221d) close to the central axis (Ab) of the cooling housing part is positioned relatively lower than the other diffuser plates (1221a, 1221b, 1221c). At this time, the lower end of the diffuser plate (1221d) arranged on the central axis side of the cooling housing part and the sloshing buffer wall (12132) may be connected and formed. At this time, the diffuser plate (1221) and the sloshing buffer wall (12132) may extend in the same direction, for example, along the first direction.

[0181] In this case, the sloshing buffer wall (12132) does not impede the diffusion of exhaust gas through the diffuser plate (1221). Accordingly, the exhaust gas flowing into the main cooling chamber (C3) from the main cooling tower (11) is relatively uniformly distributed within the main cooling tower (12), while the structural stability of the diffuser section (122) within the main cooling housing section (121) is reinforced, and the height of the sloshing buffer wall (12132) can be supplemented.

[0182] The vortex preventer (12133) may be formed to extend between the inner walls of the coolant outlet (12131) to partition the coolant outlet. The coolant outlet (12131) has a cross-section narrower than that of the sump section (1213) or the main cooling housing section (121), so that a vortex may be formed when the coolant flows out. The vortex preventer (12133) may partition the coolant outlet into a plurality of small spaces to prevent the vortex.

[0183] As illustrated in FIG. 18, the vortex preventer (12133) may be formed by a plurality of intersecting plates extending along a first direction and a second direction perpendicular thereto. By arranging a plurality of plates in this manner, the coolant flows out through a plurality of small channels, thereby reducing the difference in flow rate in each compartment and aligning the flow, thereby preventing vortices. In addition, the coolant is discharged through each channel partitioned by the plates while maintaining a straight flow, thereby preventing vortices. The number of plates extending in the first direction and the number of plates extending in the second direction may be the same, but may be different.

[0184] Referring to FIGS. 20 to 22, the sloshing buffer wall (12132) may extend in a first direction on the same plane as some of the partition plates of the vortex preventer (12133). Among the partition plates constituting the vortex preventer (12133), the first partition plate extending on the same plane as the sloshing buffer wall (12132) may extend integrally with the sloshing buffer wall (12132). In other words, the sloshing buffer wall (12132) may also be understood as being formed such that the first partition plate extends from the cooling water outlet (12131) at the bottom of the sump section (1213) to a preset height of the cooling housing section (121).

[0185] In addition, referring to FIGS. 20 and 21, the partition of the vortex preventer (12133) may have a shape that extends upward from the lower end of the coolant outlet (12131) with a constant width or width, and then decreases in the width or width at a portion of the upper side of the coolant outlet (12131) and becomes tapered. The partition of the vortex preventer may be joined (for example, by a method such as welding) to the inner wall of the coolant outlet (12131), and the ease of installation of the vortex preventer may be secured by making the width or width decrease at a portion of the upper side of the coolant outlet (12131).

[0186] However, the sloshing buffer wall (12132) does not exclude an embodiment in which it is formed to extend independently without being connected to the diffusion plate (1221) of the diffuser section (122) or the grid plate of the vortex preventer (12133), and it may be formed independently without being connected to other components within the cooling housing section (121).

[0187] Continuing with reference to FIGS. 20 and 21, an overflow pipe (12134) may be provided to maintain the water level within the cooling housing section (121) and discharge the upper layer water to the outside of the cooling housing section (121). As a secondary function of cooling the exhaust gas, the exhaust gas is cleaned, and the overflow pipe (12134) allows the upper layer water to be discharged while maintaining the internal pressure of the exhaust gas cooler (10). The low-pressure exhaust gas recirculation device of the engine can form a pressure of 30 to 50 mbar, and the overflow pipe (12134) can prevent pressure loss and exhaust gas leakage.

[0188] The overflow pipe (12134) of the present invention applies a U-shaped seal and enables preferential overflow discharge of floating substances with a light specific gravity in the upper layer. The overflow pipe (12134) may include an inlet (12134a), a seal portion (12134b), an outlet (12134c), and a pressure control hole (12134d).

[0189] The inlet (12134a) opens upward at a predetermined height within the sump section (1213), so that the upper layer water within the cooling tower (12) can flow into the overflow pipe. The inlet (12134a) can be positioned to correspond to a predetermined water level within the cooling tower (12), and light floating matter in the upper layer water can be preferentially discharged to the outside of the cooling tower through the overflow pipe.

[0190] The seal (12134b) is formed in a U shape between the inlet (12134a) and the outlet (12134c), and the U-shaped trap is filled with water, thereby preventing uncooled and unpurified exhaust gas within the cooling tower (12) from being discharged to the outside.

[0191] The outlet (12134c) extends outside the cooling housing section (121) so that water in the sump section or cooling water tank of the cooling tower (121) can be discharged to the outside.

[0192] A pressure regulating hole (12134d) may be formed between the seal portion (12134b) and the discharge port (12134c) inside the cooling housing portion. The pressure regulating hole (12134d) may be understood as a hole that opens upward between the seal portion (12134b) and the discharge port (12134c) in the overflow pipe. As the pressure regulating hole (12134d) is formed, the internal pressure of the cooling housing portion (121) acts on the inlet portion (12134a) side, which is the front end of the overflow pipe, and the pressure regulating hole (12134d) side, which is the rear end, so that water accumulated in the trap of the seal portion (12134b) may not be discharged to the outside. For example, the pressure regulating hole (12134d) may be a hole with a diameter of several millimeters.

[0193] Additionally, a drain hole (12134e) may be provided to drain water accumulated in the seal portion (12134b) to the outside.

[0194] In addition, although not shown, a cooling water tank (20) formed integrally with the sump (1213) may be connected to a water replenishment pipe for replenishing cooling water when the cooling water in the cooling water tank is insufficient, a treated water recirculation pipe for reintroducing purified cooling water into the cooling water tank, and a cooling water discharge pipe for supplying cooling water using a pump and spraying it to the upper part of the cooling tower.

[0195] When the cooling water tank (20) is formed integrally with the sump section (1213), the water supplement pipe can maintain a constant water level in the sump section (1213) by supplementing the cooling water purified from the outside when the cooling water in the cooling water tank is insufficient. The treatment water recirculation pipe can be optimized in the installation space and pipe length under the structure in which the cooling water tank is provided integrally. In the case of the cooling water discharge pipe, compared to connecting from a separate cooling water tank to the upper part of the cooling tower (12), by connecting from the sump section (1213) of the cooling tower to the upper part of the cooling tower, the installation space and pipe length can be optimized.

[0196] The detailed description above is illustrative of the present invention. Furthermore, the above description illustrates and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. In other words, changes or modifications are possible within the scope of the inventive concept disclosed in this specification, the scope equivalent to the written disclosure, and / or the scope of technology or knowledge in the art. The written embodiments illustrate the best possible state for implementing the technical idea of ​​the present invention, and various modifications required for specific application fields and uses of the present invention are also possible. Therefore, the detailed description of the invention above is not intended to limit the present invention to the disclosed embodiments. Furthermore, the appended claims should be construed to include other embodiments.

Claims

1. In the exhaust gas cooler of the exhaust gas recirculation system installed on a ship, which cools the exhaust gas discharged from the engine and supplies it back to the engine, A pre-cooling tower that primarily cools the exhaust gas introduced into the pre-cooling chamber, The cooling tower includes a cooling housing part that is connected to the above-mentioned cooling tower and the cooling connection part to perform secondary cooling of the primary cooled exhaust gas, and forms a cooling chamber therein. The above cooling tower is an exhaust gas cooler characterized in that a cooling water tank for storing cooling water discharged after cooling the exhaust gas is formed integrally in the sump portion of the cooling housing portion.

2. In paragraph 1, The above cooling housing part includes a cooling water outlet opening in the lower direction of the sump part, The above sump section includes a sloshing buffer wall that maintains the height of the water surface within the main cooling housing section when the ship is tilted, An exhaust gas cooler, characterized in that the sloshing buffer wall extends in a first direction from one inner wall of the cooling water tank to the other inner wall.

3. In paragraph 2, The above sloshing buffer wall extends from the bottom of the sump, An exhaust gas cooler characterized in that it is formed at a height that minimizes the inflow of cooling water into the interior of the above-mentioned line cooling connection when the ship is tilted.

4. In paragraph 3, The above sloshing buffer wall extends from the bottom of the sump to a preset height of the main cooling housing portion, An exhaust gas cooler, characterized in that the preset height is set so that when the ship is tilted, the height of the water surface within the main cooling housing section is located lower than the lower end of the opening formed within the main cooling housing section by the line cooling connection section.

5. In paragraph 2, An exhaust gas cooler, characterized in that the sloshing buffer wall has a perforation formed therein so that adjacent subspaces divided by the sloshing buffer wall within the cooling water cooler are in fluid communication.

6. In paragraph 2, The above sump section includes an anti-vortex device formed of at least one grating extending between the inner walls of the coolant outlet section to partition the coolant outlet section, The above sloshing buffer wall is formed integrally with the first plate among the plates of the vortex preventer, An exhaust gas cooler, characterized in that the sloshing buffer wall and the first partition extend on the same plane.

7. In paragraph 2, The above cooling unit includes a diffuser unit having a plurality of plate-shaped diffuser plates having a plurality of holes formed on one side and penetrating the other side, The above diffuser part is arranged so that the diffuser plate close to the central axis of the main cooling housing part is located relatively lower than the main cooling housing part, An exhaust gas cooler characterized in that the lower part of the diffusion plate arranged on the central axis side of the above-mentioned cooling housing part and the above-mentioned sloshing buffer wall are connected.

8. In paragraph 7, An exhaust gas cooler, characterized in that the above diffusion plate and the above sloshing buffer wall extend in the same direction.

9. In paragraph 2, The above sump unit further includes an overflow pipe that maintains the water level within the main cooling housing unit and discharges the upper water to the outside of the main cooling housing unit. An exhaust gas cooler, characterized in that the overflow pipe includes an inlet opening upward at a predetermined height within the sump section, an outlet extending outside the main cooling housing section, and a seal section formed in a U shape between the inlet and the outlet.

10. In paragraph 9, An exhaust gas cooler, characterized in that the overflow pipe further includes a pressure regulating hole formed between the seal portion and the discharge port inside the main cooling housing portion.

11. In paragraph 1, The above coolant tank, A water replenishment pipe for replenishing the coolant in the coolant tank when the coolant is insufficient; A treated water recirculation pipe that re-injects purified cooling water into the cooling water tank; An exhaust gas cooler characterized by including a cooling water discharge pipe for supplying the cooling water by a pump and spraying it to the upper part of the cooling tower.

12. In paragraph 1, The above cooling tower includes a packing part formed in the cooling chamber of the above cooling housing part to increase the heat exchange area for secondary cooling of the firstly cooled exhaust gas, An exhaust gas cooler, characterized in that the above packing part is a structured packing in which a filler having a certain pattern is structured.

13. In paragraph 12, The above packing part is formed by stacking multiple packing layers, or An exhaust gas cooler characterized in that the packing density of each packing layer is different, and the packing density of the packing layer located relatively on the upper side is higher than the packing density of the packing layer located relatively on the lower side.

14. In paragraph 12, An exhaust gas cooler, wherein the above packing section is characterized in that adjacent packing layers are cross-laminated at a constant angle.

15. In paragraph 12, An exhaust gas cooler, characterized in that the above cooling tower includes a cooling spray unit located above the packing unit and spraying water for secondary cooling of the primary cooled exhaust gas onto the packing unit.

16. In accordance with paragraph 15, The above cooling tower includes a demister unit located above the above cooling spray unit to remove mist, The above demister part includes a vane part in which a plurality of blades forming an inclined surface are spaced apart to form a gap, and a mesh part in which a plurality of thin and long wires are intertwined to form a gap. An exhaust gas cooler, characterized in that the above-mentioned vane portion is located on the lower side of the above-mentioned mesh portion.

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