Greenhouse gas emission reduction device for ship, and ship or marine structure provided with same

Abstract

Disclosed is a greenhouse gas emission reduction device for a ship, which comprises a seawater supply unit (110) for supplying seawater, an absorption liquid circulation supply unit (120) for supplying and circulating an absorption liquid for absorbing CO2, an absorption tower (130) for regenerating the absorption liquid, an absorption liquid regeneration unit (140) for regenerating the absorption liquid, and an in-ship storage unit (150) for storing the CO2 in the ship after mineralization and micronization, and which stores the CO2 in the ship after mineralization and micronization. The absorption tower (130) includes a CO2 removal unit (131) that cools the exhaust gas discharged from the ship engine by reacting the exhaust gas with seawater, and that collects CO2 by converting CO2 into an aqueous carbonate solution by reacting the cooled exhaust gas with an absorption liquid. An absorption liquid regeneration unit (140) regenerates an absorption liquid and generates a precipitate by reacting an aqueous carbonate solution with a divalent metal oxide or a divalent metal hydroxide, and an in-ship storage unit (150) separates, dries and particulates the precipitate and then stores the precipitate in the ship.

Description

Technical Field

[0001] The present invention relates to a greenhouse gas emission reduction device for a ship and a ship or marine structure equipped with the same. More specifically, it relates to a greenhouse gas emission reduction device for a ship and a ship or marine structure equipped with the same as follows: CO2 is captured from exhaust gas, mineralized, crushed and micronized, so that it can be stored on board without polluting the marine environment, thereby being easily unloaded. Background Art

[0002] Recently, due to the influence of greenhouse gas emissions caused by the uncontrolled use of fossil fuels, global warming phenomena and environmental disasters related thereto are occurring.

[0003] Therefore, a series of technologies related to the method of capturing and storing carbon dioxide, a typical greenhouse gas, instead of emitting it are called CCS (Carbon Dioxide Capture and Storage) technologies, and this series of technologies has recently attracted much attention. Among CCS technologies, chemical absorption is the most widely used technology because it can be processed on a large scale.

[0004] In addition, CO2 emissions are regulated through the Energy Efficiency Design Index (EEDI) of the International Maritime Organization (IMO), with the goal of reducing emissions by more than 50% from 2008 levels by 2050. Since emissions need to be reduced by 40% from 2008 levels by 2030, technologies that do not emit CO2 or capture emitted CO2 are attracting much attention.

[0005] For reference, CO2 capture technology, which directly captures and stores carbon dioxide in CCS technology, can be approached in various ways depending on the CO2 generation conditions of the target process. Currently, representative technologies include absorption, adsorption and membrane separation. Among them, for land plants, the wet absorption method has high technical maturity and is easy to handle large amounts of CO2. It can be said to be the capture technology closest to commercialization in CCS technology. Amines and ammonia are mainly used as absorbents.

[0006] In addition, the aforementioned technologies for reducing carbon dioxide emissions or capturing generated carbon dioxide have not yet been commercialized in ships. Methods for using hydrogen or ammonia as fuel are also currently under development and have not yet reached the commercialization stage.

[0007] In addition, in ships equipped with scrubbers for use with high-sulfur fuel, SO X The solubility is large and it first turns into NaSO3 compound, so it exists until SO XBefore all the CO2 is dissolved, it is difficult to remove it. In particular, a separate consumable absorption liquid raw material is used to remove CO2, which increases the cost of greenhouse gas removal.

[0008] Therefore, for ships that do not have a separate consumable absorbent raw material and use fossil fuels, it is necessary to apply technology on the ship to convert CO2 in the exhaust gas discharged from the ship's engine into a substance that does not affect the environment and store it instead of discharging it at sea. Summary of the invention

[0009] Technical issues

[0010] The technical problem to be achieved by the concept of the present invention is to provide a greenhouse gas emission reduction device for ships, which can capture CO2 from exhaust gas, mineralize it, crush it and micronize it, store it on board without polluting the marine environment, and thus can be easily unloaded, and a ship or marine structure equipped with it.

[0011] Technical Solution

[0012] In order to achieve the above-mentioned purpose, the present invention provides a greenhouse gas emission reduction device for a ship, comprising: an absorption liquid circulation supply unit, which provides an absorption liquid for absorbing CO2 and circulates the absorption liquid; an exhaust gas cooling unit, which cools the exhaust gas discharged from the ship engine; an absorption tower, including a CO2 removal unit that allows the cooled exhaust gas to react with the absorption liquid to convert CO2 into a carbonate aqueous solution and capture CO2; an absorption liquid regeneration unit, which regenerates the absorption liquid by reacting the carbonate aqueous solution with a regeneration reactant and generates a precipitate; and an onboard storage unit, which separates the precipitate and stores it onboard.

[0013] Here, the onboard storage unit separates, dries, and micro-particles the sediment to store it onboard.

[0014] At this time, the in-vessel storage unit can separate the sediment by filtering the turbid liquid mixed with the sediment and the absorption liquid, can dry and peel off the sediment by high-temperature dry air, and can crush the sediment into micro-particles while supplying high-temperature compressed air.

[0015] Specifically, the in-vessel storage unit may include: a separator, including an outer wall and an internal filter, and allowing the turbid liquid to flow between the outer wall and the internal filter to accumulate solid precipitates between the outer wall and the internal filter, and allowing the absorption liquid to return to the absorption liquid circulation supply unit or the absorption liquid regeneration unit; an air heater, blowing high-temperature dry air to the separator to perform high-temperature drying on the precipitate; a pulverizer, which is composed of an internal rotating cylinder and an external rotating cylinder respectively formed with grids of predetermined sizes, so that the high-temperature dried precipitate is pulverized between the internal rotating cylinder and the external rotating cylinder to be uniformly micronized; and a sediment storage tank, which stores and contains the pulverized precipitate.

[0016] Here, the air heater may provide the high-temperature dry air by blowing the high-temperature dry air toward the pulverizer.

[0017] At this time, the air heater may heat the air at 90° C. to 100° C. to provide the high-temperature dry air.

[0018] Furthermore, when the separation and high-temperature drying of the precipitate are completed in the separator, the separator peels off the precipitate that may be attached to the outer surface of the internal filter and discharges the precipitate to the pulverizer.

[0019] Here, the precipitate may be stripped off by flowing compressed air to the separator.

[0020] Furthermore, the sediment can be peeled off by the contraction and expansion structure of the internal filter.

[0021] Furthermore, a filter for capturing dust generated by the pulverizing machine or a cyclone dust collector for collecting the dust may be included, so that the captured powder or the collected powder is supplied to the sediment storage tank.

[0022] Furthermore, the precipitate may include carbonate, and the absorption liquid is a monovalent alkaline aqueous solution and includes one of a LiOH aqueous solution, a NaOH aqueous solution, a KOH aqueous solution, and an NH4OH aqueous solution.

[0023] Furthermore, it may also include: a seawater supply unit for supplying seawater from outside the ship, wherein the seawater supply unit includes: a seawater pump for receiving the seawater from outside the ship through a seabed suction box and pumping the seawater into the absorption tower; and a seawater regulating valve for adjusting the injection amount of the seawater supplied from the seawater pump to the absorption tower according to the amount of exhaust gas.

[0024] Here, the exhaust gas cooling unit may cool the exhaust gas discharged from the ship engine by causing the exhaust gas to react with the seawater supplied from the seawater supply unit.

[0025] Furthermore, the exhaust gas cooling unit may cool the exhaust gas discharged from the ship engine by reacting with clean water.

[0026] Furthermore, the exhaust gas cooling unit may cool the exhaust gas by circulating clean water supplied from an in-vessel cooling system through a heat exchange pipe surrounding the exhaust gas discharge pipe.

[0027] Furthermore, the exhaust gas cooling unit may be disposed inside the absorption tower.

[0028] Furthermore, the absorption liquid circulation supply part may include: an absorption liquid storage tank for storing the absorption liquid; an absorption liquid pump for pumping the absorption liquid from the absorption liquid storage tank for transfer; an absorption liquid circulation tank for mixing and storing the carbonate aqueous solution discharged from the absorption tower and the absorption liquid supplied from the absorption liquid pump; and an absorption liquid circulation pump for supplying the absorption liquid from the absorption liquid circulation tank to the upper end of the CO2 removal part to circulate the absorption liquid.

[0029] Here, the absorption liquid pump may supply the absorption liquid to the absorption liquid circulation tank to make up for a shortage of the absorption liquid discharged to the in-vessel storage unit.

[0030] Furthermore, the absorption liquid can be generated by electrolyzing seawater and clean water respectively, and stored in the absorption liquid storage tank.

[0031] Furthermore, the exhaust gas cooling unit may also include: a seawater supply unit for supplying seawater from outside the ship, wherein the exhaust gas cooling unit is arranged inside the absorption tower, and the absorption tower as the exhaust gas cooling unit also includes SO X Absorption part, the SO X The absorption unit cools the exhaust gas by reacting with the seawater supplied from the seawater supply unit, while dissolving and removing SO X The CO2 removal unit cools and removes SO X The exhaust gas reacts with the absorbent supplied from the absorbent circulation unit to convert CO 2 into a carbonate aqueous solution, thereby capturing CO 2 .

[0032] Alternatively, it may further include: a seawater supply unit for supplying seawater from outside the ship, wherein the absorption tower further includes a NOx absorber for absorbing and removing the exhaust gas. X NO X The exhaust gas cooling unit is arranged inside the absorption tower to remove NO X The exhaust gas is cooled by reacting with the seawater supplied from the seawater supply unit, and the CO2 removal unit converts CO2 into a carbonate aqueous solution by reacting the cooled exhaust gas with the absorbent from the absorbent circulation supply unit, thereby capturing CO2.

[0033] Alternatively, the exhaust gas cooling unit may further include: a seawater supply unit for supplying seawater from outside the ship, wherein the exhaust gas cooling unit is arranged inside the absorption tower, wherein the absorption tower is sequentially stacked to form: NO X Absorption unit absorbs and removes NO in exhaust gas X ;SO X The absorption part, as the exhaust gas cooling part, removes the NO X The exhaust gas reacts with the seawater supplied from the seawater supply unit to dissolve and remove SO X ; and the CO2 removal unit, so that the cooling and removal of SO X The exhaust gas reacts with the absorbent supplied from the absorbent circulation unit to capture and remove CO 2 by converting CO 2 into a carbonate aqueous solution.

[0034] Furthermore, the NO X The absorption section may include a selective catalyst reactor.

[0035] Here, the NO X The absorption part may further include: a urea water storage tank for storing urea water; and a urea water supply pump for sucking urea water from the urea water storage tank 133 a and supplying the urea water to an injection nozzle inserted into the lower end of the SCR.

[0036] Furthermore, the SO X The absorption part may include: a flow path for the exhaust gas to pass through; and a multi-stage seawater injection nozzle, which injects seawater supplied from the seawater supply part downward by opening and closing the seawater regulating valve, thereby dissolving SO X It also removes dust such as soot and cools the exhaust gas.

[0037] Here, the SO X The absorption part may include a first temperature sensor and a second temperature sensor for respectively measuring the front and rear temperatures of the exhaust gas passing through the seawater injection nozzle, and may adjust the amount of seawater injection through the seawater injection nozzle according to the amount of exhaust gas or the temperatures respectively measured by the first temperature sensor and the second temperature sensor.

[0038] Furthermore, a plurality of stacked plates in which holes for exhaust gas to pass are cross-arranged and separated up and down may be formed in the flow path, or a structure forming a curved flow path may be formed in the flow path, or an absorbent filled with a filler may be formed in the flow path, and a partition or umbrella-shaped blocking plate may be formed to prevent backflow of washing water.

[0039] Furthermore, the CO2 removal section may include: a first injection nozzle, which injects the absorption liquid supplied from the absorption liquid regeneration section; a first filler, which is formed at the lower end of the first injection nozzle, so that the exhaust gas and the absorption liquid undergo a first reaction; a second injection nozzle, which injects the absorption liquid provided and circulated from the absorption liquid circulation supply section; and a second filler, which is formed at the lower end of the second injection nozzle, so that the exhaust gas and the absorption liquid undergo a second reaction.

[0040] Here, the CO2 removal unit may further include: a defogger plate having a curved multi-plate structure, formed at the upper end of the second injection nozzle and cutting off the absorption liquid from being discharged to the outside; and a blocking plate in the form of a partition or umbrella to prevent the absorption liquid from flowing back to the exhaust gas piping.

[0041] Furthermore, the CO 2 removal unit may include a cooling jacket for cooling heat generated in the first filler and the second filler.

[0042] Furthermore, the CO 2 removal unit may adjust the injection amount of the absorbent by monitoring pH according to the degree of reaction in the first filler and the second filler.

[0043] Furthermore, the absorption liquid regeneration section may include: a regeneration reactant storage tank for storing the regeneration reactant; a transfer pump for pumping the carbonate aqueous solution for transfer; and a mixing tank for mixing the regeneration reactant with the carbonate aqueous solution for reaction to regenerate the absorption liquid, generate solid carbonate, and return the regenerated absorption liquid to the absorption tower.

[0044] Here, the regeneration reactant may include a divalent metal oxide or a divalent metal hydroxide.

[0045] Furthermore, it may also include: a washing water treatment section, which is composed of a washing water tank, a water treatment device and a sludge storage tank, wherein the washing water tank stores the washing water discharged from the absorption tower, the water treatment device is equipped with a filtering unit for adjusting turbidity and a neutralizer injection unit for adjusting pH to meet the overboard discharge conditions of the washing water transferred from the washing water tank, and the sludge storage tank is used to separate and store solid discharge.

[0046] Here, the system may further include a seawater supply unit for supplying seawater from outside the ship, wherein when the wash water treated in the water treatment device is discharged outside the ship, the wash water is dissolved or diluted in the seawater supplied from the seawater supply unit before being discharged.

[0047] Furthermore, the wash water treatment unit may further include a fresh water cooler for cooling the seawater supplied from the seawater supply unit into cooling water.

[0048] Furthermore, it may also include an exhaust gas economizer (EGE) to X Absorption and SO X The absorber is formed between the absorbers to exchange heat between the waste heat from the ship engine and the boiler water from the steam generating unit.

[0049] Here, it can also include: a steam generating unit, which is composed of an auxiliary boiler, a boiler water circulation pump, a cascade tank, a supply pump and a regulating valve, wherein the auxiliary boiler receives a mixture of steam and saturated water for heat exchange, separates the steam by means of a steam bag, and supplies it to the steam consumption point in the ship, the boiler water circulation pump circulates boiler water from the auxiliary boiler to the EGE, the cascade tank recovers condensed water that has been condensed and phase-changed after being consumed from the steam consumption point, and the supply pump and the regulating valve adjust the amount of boiler water from the cascade tank to the auxiliary boiler and supply it.

[0050] Furthermore, the exhaust gas cooling unit may branch and cool at least a portion of the exhaust gas discharged from the ship engine, and the CO 2 removal unit may convert CO 2 into the carbonate aqueous solution by reacting the cooled exhaust gas with the absorbent, thereby capturing CO 2 .

[0051] Here, the exhaust gas cooling unit may include: an air supply unit that supplies at least a portion of the branched exhaust gas to the exhaust gas cooling unit.

[0052] At this time, the air supply unit may be a blower.

[0053] Furthermore, residual exhaust gas discharged from the ship engine that is not branched to the exhaust gas cooling unit can be discharged through the main exhaust pipe, and at least a portion of the exhaust gas branched to the exhaust gas cooling unit can be discharged by converging into the main exhaust pipe after CO2 is captured, or can be discharged through a separate exhaust pipe.

[0054] Furthermore, the sediment storage tank may be constructed in an openable and closed structure to unload the sediment stored therein, or may be constructed in a structure separated from the deck of the ship to unload the sediment stored therein.

[0055] Furthermore, the air heater may heat the air using waste heat of exhaust gas exhausted from the ship engine.

[0056] In addition, another embodiment of the present invention provides a ship or a marine structure equipped with the greenhouse gas emission reduction device for ships listed above.

[0057] Beneficial Effects

[0058] According to the present invention, CO2 is captured from the exhaust gas and mineralized, crushed, and micronized before being stored on board the ship, so that it can be easily unloaded, and greenhouse gases are mineralized and stored without being discharged into the ocean, thereby reducing environmental pollution and removing NO X 、SO X and CO2, can be stored in a solid state containing small amounts of impurities such as Na2CO3, NaHCO3, (NH4)2CO3, and NH4HCO3, and can be removed by removing SO X Afterwards, CO2 can be removed to suppress the formation of SO2 remaining in the exhaust gas. X The side reactions caused by the reaction can improve the CO2 solubility and CO2 removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 2 is a structural diagram illustrating a greenhouse gas emission reduction device for a ship according to an embodiment of the present invention.

[0060] Figure 2 It is a graphic presentation Figure 1 System circuit diagram of the greenhouse gas emission reduction device of the ship.

[0061] Figure 3 It is a separation diagram Figure 2 Diagram of the seawater supply unit and absorption tower.

[0062] Figure 4 It is a separation diagram Figure 2 Diagram of the absorption liquid circulation supply section and the absorption liquid regeneration section.

[0063] Figure 5 It is a separation diagram Figure 2 Diagram of the inboard storage section.

[0064] Figure 6 It is a separation diagram Figure 2 Diagram of the wash water treatment section.

[0065] Figure 7 It is a separation diagram Figure 2 Figure 2 shows a diagram of a steam generating section.

[0066] Figure 8 It's an example Figure 3 Diagram of the CO2 removal section. DETAILED DESCRIPTION

[0067] Hereinafter, embodiments of the present invention having the above-mentioned features will be described in more detail with reference to the accompanying drawings.

[0068] The greenhouse gas emission reduction device for a ship according to an embodiment of the present invention is intended to include a seawater supply unit 110, an absorption liquid circulation supply unit 120, an absorption tower 130, an absorption liquid regeneration unit 140 and an onboard storage unit 150 to mineralize and micronize CO2, thereby storing it onboard without polluting the marine environment, wherein the seawater supply unit 110 supplies seawater, the absorption liquid circulation supply unit 120 provides an absorption liquid for absorbing CO2 and circulates it, the absorption tower 130 includes a CO2 removal unit 131, the CO2 removal unit 131 cools the exhaust gas discharged from the ship engine 10 by reacting with seawater, and reacts the cooled exhaust gas with the absorption liquid to convert CO2 into a carbonate aqueous solution, thereby capturing CO2, the absorption liquid regeneration unit 140 regenerates the absorption liquid and generates a precipitate by reacting the carbonate aqueous solution with a divalent metal oxide or a divalent metal hydroxide, and the onboard storage unit 150 stores the precipitate onboard by separating, drying and micronizing it.

[0069] Here, depending on the type and specification of the ship engine used as the main engine or the power generation engine (low-pressure engine or high-pressure engine), the type of fuel supplied to the ship engine (HFO, MDO, LNG, MGO, LSMGO, ammonia, etc.), the absorption tower may be configured to selectively include a NO removal unit in addition to the CO2 removal unit. X Absorption part or SO X The absorbing part may be configured to include the entire part.

[0070] In particular, when LNG is used as fuel for ship engines, it does not generate SO X , so there is no need to set up SO separately X However, when using low sulfur oil (LSMGO), a small amount of SO may be generated. X Therefore, it is also possible to add equipment that can simultaneously perform exhaust gas cooling and SO X Dissolves and absorbs SO X SO X Absorption department.

[0071] The following describes the process of stacking NO in the absorption tower. X Absorption section, SO as exhaust gas cooling section X The present invention is an embodiment of an absorption unit and a CO2 removal unit, but is not limited to this.

[0072] In particular, the exhaust gas cooling unit cools the exhaust gas discharged from the ship engine to reduce the temperature of the exhaust gas, thereby enabling the absorption of CO2 by the absorbent to be smooth, and using the SO XThe absorption section can replace its function, or can cool the exhaust gas by heat exchange with fresh water. Specifically, fresh water provided from the ship's cooling system (not shown) circulates in a heat exchange piping (not shown) surrounding the exhaust gas exhaust pipe through which the exhaust gas flows, thereby cooling the exhaust gas to a temperature of 27°C to 33°C by heat exchange with the fresh water.

[0073] At this time, in the water cooling method of directly cooling the exhaust gas by clean water, the temperature of the absorption liquid will decrease due to the input of clean water, so the greenhouse gas absorption performance may be reduced. Therefore, it is preferable to prevent the concentration of the absorption liquid from decreasing due to cooling the exhaust gas by heat exchange, so as to keep the greenhouse gas absorption performance constant.

[0074] Below, refer to Figures 1 to 8 , specifically and in detail describing the composition of the greenhouse gas emission reduction device of the aforementioned ship.

[0075] First, the seawater supply unit 110 is a structure for supplying seawater to the absorption tower 130 and the washing water treatment unit 160. Specifically, Figure 2 and Figure 3 As shown, the seawater supply unit 110 may include: a seawater pump 112, which sucks and receives seawater from outside the ship through a seafloor suction box (seachest) 111, and pumps the seawater to the SO X and the seawater regulating valve 113, which regulates the amount of exhaust gas to SO X The injection amount of seawater supplied by the absorption unit 132. At this time, preferably, the seawater pump 112 may be a quenching seawater pump.

[0076] For reference, depending on whether the ship is at the shore or at sea, the seawater pump 112 can be selectively supplied from a high seabed suction tank that sucks the upper seawater or a low seabed suction tank that sucks the lower seawater according to the water depth. That is, when the ship is at the shore, the upper seawater is cleaner than the lower seawater, so the high seabed suction tank can be used, and when the ship is sailing, the lower seawater is cleaner than the upper seawater, so the low seabed suction tank can be used.

[0077] Here, the seawater regulating valve 113 may be a manually operated diaphragm valve or a solenoid valve for regulating the flow rate of seawater, and may adjust the amount of seawater injected through the seawater injection nozzle according to the amount of exhaust gas.

[0078] Next, the absorption liquid circulation supply unit 120 is a structure for providing an absorption liquid for absorbing CO2 contained in the exhaust gas and circulating it to the absorption tower 130. Specifically, Figure 2 and Figure 4As shown, the absorption liquid circulation supply part 120 may include: an absorption liquid storage tank 121, for storing absorption liquid; an absorption liquid pump 122, for sucking absorption liquid from the absorption liquid storage tank 121 and transferring it to the absorption liquid circulation tank 123; the absorption liquid circulation tank 123, after washing the exhaust gas, mixes the carbonate aqueous solution discharged from the absorption tower 130 and the absorption liquid supplied from the absorption liquid pump 122 and stores them; and an absorption liquid circulation pump 124, for supplying absorption liquid from the absorption liquid circulation tank 123 to the upper end of the CO2 removal part 131 and circulating it.

[0079] At this time, the absorption liquid can be a monovalent alkaline aqueous solution including lithium hydroxide (LiOH) aqueous solution, sodium hydroxide (NaOH) aqueous solution, potassium hydroxide (KOH) aqueous solution or ammonia (NH4OH) aqueous solution, preferably, it can be NaOH aqueous solution and / or NH4OH aqueous solution.

[0080] Here, in the first step of converting the exhaust gas into a carbonate aqueous solution by reacting the exhaust gas with the absorbing liquid which is a monovalent alkaline aqueous solution, CO2 in the exhaust gas reacts with water according to the following [Chemical Formula 1] to generate carbonic acid (H2CO3). At this time, the water that reacts with CO2 may be water that coexists in the monovalent alkaline aqueous solution as the absorbing liquid.

[0081] [Chemical formula 1]

[0082] CO2+H2O→H2CO3

[0083] After the first step, when the monovalent alkaline aqueous solution as the absorbing liquid is a NaOH aqueous solution, sodium bicarbonate (NaHCO3) or sodium carbonate (Na2CO3) and water as carbonate are generated according to the following [Chemical Formula 2], thereby converting into a carbonate aqueous solution.

[0084] [Chemical formula 2]

[0085] NaOH+H2CO3→NaHCO3+H2O

[0086] 2NaOH+H2CO3→Na2CO3+2H2O

[0087] Alternatively, after the first step, when the monovalent alkaline aqueous solution as the absorbing liquid is an NH4OH aqueous solution, ammonium bicarbonate (NH4HCO3) or ammonium carbonate ((NH4)2CO3) and water as carbonate are generated by the following [Chemical Formula 3], thereby converting it into a carbonate aqueous solution.

[0088] [Chemical formula 3]

[0089] NH4OH+H2CO3→NH4HCO3+H2O

[0090] 2NH4OH+H2CO3→(NH4)2CO3+2H2O

[0091] Furthermore, the absorption liquid pump 122 may supply a predetermined amount of absorption liquid to the absorption liquid circulation tank 123 to make up for a shortage of the absorption liquid that may occur when the solid CaCO 3 carbonate is stored on board the ship via the onboard storage unit 150 .

[0092] In addition, the NaOH absorption liquid can be generated by electrolyzing seawater and clean water respectively and stored in the absorption liquid storage tank 121, and electricity can be generated by the reduction and oxidation of Na and supplied as a predetermined ratio of electricity applied for electrolysis, thereby saving a portion of the electricity required to generate NaOH (aq).

[0093] For reference, in the absorption tower 130, the absorption liquid can contact the exhaust gas so that CO2 can be ionized in the form of ions, and the ionized absorption liquid can flow into the absorption liquid circulation tank 123. In the absorption liquid discharged from the lower end of the CO2 removal part 131, the CO3 2- When all the CO2 absorption occurs, HCO3 - The concentration of ions is high, CO3 2- The concentration is relatively small, and the absorption liquid can be at a relatively high temperature, so the amount of precipitation is small, most of it exists in the form of ions. As CO2 is dissolved, HCO3 - The concentration of ions can be increased so that it can be continuously used for CO2 absorption until a predetermined concentration is reached.

[0094] Next, the absorption tower 130 may include a CO 2 removal unit 131 that allows the exhaust gas discharged from the ship engine 10 to react with seawater to be cooled, and allows the cooled exhaust gas to react with an absorption liquid to convert CO 2 into a carbonate aqueous solution, thereby capturing CO 2 .

[0095] For example, the absorption tower 130 may further include: SO X The absorption unit 132 cools the exhaust gas by reacting with the seawater supplied from the seawater supply unit 110, while dissolving and removing SO X , wherein the CO2 removal unit 131 makes the removed SO X The exhaust gas reacts with seawater supplied from the seawater supply unit 110 to be cooled, and the cooled exhaust gas reacts with the absorbent from the absorbent circulation supply unit 120 to be converted into a carbonate aqueous solution, thereby capturing CO2.

[0096] Alternatively, the absorption tower 130 may further include: NO X The absorption unit 133 absorbs and removes NO in the exhaust gas. X , wherein the CO2 removal unit 131 makes the removed NOX The exhaust gas is reacted with seawater supplied from the seawater supply unit 110 to be cooled, and the cooled exhaust gas is reacted with the absorbent from the absorbent circulation supply unit 120 to be converted into a carbonate aqueous solution, thereby capturing CO2.

[0097] Alternatively, the absorption tower 130 may be stacked in sequence to form a NO X Absorption part 133, SO X The absorption unit 132 and the CO2 removal unit 131, wherein the NO X The absorption unit 133 absorbs and removes NO in the exhaust gas. X , the SO X The absorption unit 132 removes NO X The exhaust gas reacts with the seawater supplied from the seawater supply unit 110 to cool the exhaust gas, dissolving and removing SO X The CO2 removal unit 131 removes SO X The exhaust gas reacts with the absorbent from the absorbent circulation supply unit 120 to be converted into a carbonate aqueous solution and captured, thereby removing CO2.

[0098] Specifically, refer to Figure 3 The CO2 removal section 131 may include: a first injection nozzle 131a, which injects the absorption liquid supplied from the absorption liquid regeneration section 140; a first filler 131b, which is formed at the lower end of the first injection nozzle 131a, so that the exhaust gas and the absorption liquid undergo a first reaction; a second injection nozzle 131c, which injects the absorption liquid provided and circulated from the absorption liquid circulation supply section 120; and a second filler 131d, which is formed at the lower end of the second injection nozzle 131c, so that the exhaust gas and the absorption liquid undergo a second reaction.

[0099] Here, the second spray nozzle 131c may be formed to branch to upper ends of the first filler 131b and the second filler 131d, respectively, to simultaneously spray the absorbing liquid downward.

[0100] And, if Figure 8 As shown, the CO2 removal section 131 may also include: a defogger plate 131e, having a curved multi-plate structure, formed at the upper end of the second injection nozzle 131c, and forming droplets to cut off the loss caused by the absorption liquid being discharged to the outside; and a partition wall 131f or an umbrella-shaped blocking plate 131g to prevent the absorption liquid from flowing back to the exhaust gas piping.

[0101] Furthermore, the CO2 removal section 131 may include a cooling jacket (not shown) for cooling the heat generated in the first filler 131b and the second filler 131d to maintain the temperature of the exhaust gas at 80°C to 100°C, or further reduce the temperature of the absorption liquid supplied from the first injection nozzle 131a and the second injection nozzle 131c by 10°C to 20°C, thereby increasing the absorption rate during the heat generation process of CO2 being absorbed by the absorption liquid while minimizing the loss caused by the gasification of H2O.

[0102] Furthermore, the first filler 131b and the second filler 131d can be composed of a distillation column packing configured to increase the contact area per unit volume and configured in multiple stages. In consideration of the contact area per unit volume, the pressure drop of the gas and the flooding velocity, a suitable distillation column packing can be selected, and a solution redistributor can be formed between the distillation column packing configured in multiple stages, thereby preventing channeling of the solution.

[0103] Furthermore, the CO 2 remover 131 may continuously monitor the pH corresponding to the reaction degree in the first filler 131 b and the second filler 131 d through the pH sensor P, and may adjust the injection amount of the absorption liquid through the first injection nozzle 131 a and the second injection nozzle 131 c according to the reaction degree.

[0104] Specifically, refer to Figure 3 , SO X The absorption part 132 may include: a flow path 132a for the exhaust gas to pass through; and a multi-stage seawater injection nozzle 132b, which injects seawater supplied from the seawater supply part 110 downward by opening and closing the seawater regulating valve 113, thereby dissolving SO X It also removes dust such as soot and cools the exhaust gas.

[0105] And, SO X The absorption part 132 may include a first temperature sensor T1 and a second temperature sensor T2 for respectively measuring the front and rear temperatures of the exhaust gas passing through the seawater injection nozzle 132b, and may adjust the amount of seawater injection through the seawater injection nozzle 132b according to the amount of exhaust gas or the temperatures respectively measured by the first temperature sensor T1 and the second temperature sensor T2.

[0106] Furthermore, the flow path 132a may be provided with a plurality of stacked plates in which holes for passing the exhaust gas are arranged crosswise and spaced apart from each other to lengthen the flow path of the exhaust gas and increase the contact time and contact area, or a structure forming a curved flow path may be formed in the flow path 132a, or an absorber filled with a filler may be formed in the flow path 132a, thereby increasing the contact area between the seawater and the exhaust gas and allowing the cooling and absorption to proceed smoothly (not shown). Furthermore, a partition wall 132c or an umbrella-shaped blocking plate 132d may be formed to prevent the backflow of the washing water, which is a reactant between the exhaust gas and the absorbent.

[0107] Therefore, through SO X The absorption unit 132 first removes SO X Then, CO2 is removed by CO2 removal unit 131, thereby solving the problem of SO X The solubility is large, causing it to first turn into compounds such as Na2SO4 and then in SO X The problem of difficulty in removing CO2 before it is completely dissolved can be solved, thereby improving the removal efficiency of CO2.

[0108] For reference, from SO X The washing water discharged from the lower end of the absorption part 132 may also contain SO3 - 、SO4 2- , soot, NaSO3, Na2SO4, MgCO3, MgSO4 and other ionic compounds.

[0109] In addition, NO X The absorption unit 133 includes a selective catalyst reactor (SCR) 133c to remove NO X The SCR 133c may include a urea water storage tank 133a storing urea water and a urea water supply pump 133b sucking urea water from the urea water storage tank 133a and supplying the urea water to an injection nozzle inserted into a lower end of the SCR 133c.

[0110] Furthermore, the absorption tower 130 may further include an exhaust gas economizer (EGE: Exhaust Gas Economizer) 134, wherein the EGE may X Absorption section 133 and SO X The absorption part 132 is formed so as to exchange heat between the waste heat of the ship engine 10 and the boiler water from the steam generation part 170 .

[0111] And, if Figure 3 As shown, the absorption tower 130 can bypass (branch) at least a portion of the exhaust gas discharged from the ship engine 10 and react with seawater to cool it, and react the cooled exhaust gas with the absorption liquid to convert CO2 into a carbonate aqueous solution to capture CO2.

[0112] That is, at least a part of the exhaust gas is branched and supplied to the SO X The air supply unit 135 of the absorption part 132 can overcome the limitation of the installation space by minimizing the back pressure generated by the piping system of the absorption tower 130 and designing the absorption tower 130 to have a minimum diameter and a high height.

[0113] Here, the air supply unit 135 may be composed of a blower 135a and an air supply regulating valve 135b. X In the case of the absorption unit 132, the blower 135a is designed to blow or pressurize the exhaust gas at 40°C to 50°C. X In the case of the absorption unit 132, the blower 135a is designed to blow or pressurize the exhaust gas at about 300°C.

[0114] At this time, among the exhaust gas discharged from the ship engine, the residual exhaust gas that is not branched to the absorption tower 130 can be discharged through the main exhaust pipe, at least a portion of the exhaust gas branched to the absorption tower 130 can be discharged by merging into the main exhaust pipe after CO2 is captured, or can be discharged through a separate exhaust pipe.

[0115] Next, the absorbing liquid regenerating unit 140 regenerates the absorbing liquid by reacting the carbonate aqueous solution with the divalent metal oxide or the divalent metal hydroxide, and generates a precipitate.

[0116] Specifically, refer to Figure 4 The absorption liquid regeneration section 140 may include: a regeneration reactant storage tank 141, which stores the regeneration reactant of divalent metal oxide (CaO) or divalent metal hydroxide (Ca(OH)2); a transfer pump 142, which draws the carbonate aqueous solution from the absorption liquid circulation tank 123 and transfers it to the mixing tank 143; and a mixing tank 143, which mixes the regeneration reactant and the carbonate aqueous solution and reacts them to regenerate the absorption liquid to generate solid carbonate (CaCO3(S)), and returns the regenerated absorption liquid to the absorption tower 130 for reuse.

[0117] First, in the case where NaOH reacts with CO2 to generate sodium bicarbonate (NaHCO3) or sodium carbonate (Na2CO3) as a carbonate, sodium bicarbonate (NaHCO3) or sodium carbonate (Na2CO3) as a carbonate reacts with calcium oxide (CaO) through the following [Chemical Formula 4] to regenerate NaOH while generating carbonate CaCO3, or reacts with calcium hydroxide (Ca(OH)2) through the following [Chemical Formula 5] to regenerate NaOH while generating carbonate CaCO3.

[0118] [Chemical formula 4]

[0119] NaHCO3+CaO→NaOH+CaCO3

[0120] Na2CO3+CaO+H2O→2NaOH+CaCO3

[0121] [Chemical formula 5]

[0122] NaHCO3+Ca(OH)2→NaOH+CaCO3+H2O

[0123] Na2CO3+Ca(OH)2→2NaOH+CaCO3

[0124] Alternatively, in the case where NH4OH and CO2 react to generate ammonium bicarbonate (NH4HCO3) or ammonium carbonate ((NH4)2CO3), ammonium bicarbonate (NH4HCO3) or ammonium carbonate ((NH4)2CO3) as a carbonate can react with calcium oxide (CaO) by the following [Chemical Formula 6] to regenerate NH4OH while generating CaCO3 as a carbonate, or react with calcium hydroxide (Ca(OH)2) by the following [Chemical Formula 7] to regenerate NH4OH while generating CaCO3 as a carbonate.

[0125] [Chemical formula 6]

[0126] NH4HCO3+CaO→NH4OH+CaCO3

[0127] (NH4)2CO3+CaO→+H2O→2NH4OH+CaCO3

[0128] [Chemical formula 7]

[0129] NH4HCO3+Ca(OH)2→NH4OH+CaCO3+H2O

[0130] (NH4)2CO3+Ca(OH)2→2NH4OH+CaCO3

[0131] Here, if the HCO3 in the absorption liquid circulation tank 123 - When the ion concentration increases, the absorbent is transferred to the mixing tank 143 by the transfer pump 142. During the mineralization process in the subsequent step, the absorbent can be transferred at a concentration that allows continuous absorption of CO 2 .

[0132] In addition, the mixing tank 143 allows the absorbent in which CO2 is ionized to react with CaO or Ca(OH)2 to regenerate the absorbent, converting CO2 into the form of CaCO3, and supplying OH from CaO or Ca(OH)2 through the reactions of [Chemical Formula 4] to [Chemical Formula 7]. - Ions, CO3- Ions can react with Ca 2+ The ions combine to form solid, insoluble CaCO3.

[0133] Next, the in-vessel storage unit 150 can separate the sediment and the absorbent by filtering the turbid liquid formed by the mixture of the sediment and the absorbent, and can peel off the sediment by drying it with high-temperature dry air, and can crush the high-temperature dried sediment into microparticles while supplying high-temperature compressed air.

[0134] Specifically, refer to Figure 5 The in-vessel storage unit 150 may include: a separator 153, which is composed of an outer wall 151 and an inner filter 152, so that the turbid liquid flows into between the outer wall 151 and the inner filter 152, so that the solid precipitate accumulates between the outer wall 151 and the inner filter 152, and the absorption liquid returns to the absorption liquid circulation supply unit 120 and / or the absorption liquid regeneration unit 140 respectively; an air heater 154, which blows high-temperature dry air to the separator 153 to dry the precipitate at high temperature; a pulverizer 155, which is composed of an inner rotating cylinder and an outer rotating cylinder respectively formed with a mesh of 190 to 210 meshes, so that the high-temperature dried precipitate passes between the inner rotating cylinder and the outer rotating cylinder to be pulverized, thereby uniformly micronized; and a sediment storage tank 156, which stores and contains the pulverized precipitate.

[0135] Here, the air heater 154 blows high-temperature dry air to the pulverizer 155 to reduce the moisture content of the pulverized sediment particles during pulverization, thereby preventing solidification due to moisture.

[0136] Furthermore, the air heater 154 heats the air to 90°C to 100°C to prevent the internal filter 152 and related components of the pulverizer 155 from being deformed or damaged due to high temperature, and can use steam generated by waste heat from the ship engine 10 to heat the air, and can provide high-temperature dry air by removing moisture from the heated air.

[0137] Furthermore, when the separation and high-temperature drying of the precipitate are completed in the separator 153 , the separator 153 can peel off the precipitate attached to the outer surface of the internal filter 152 and discharge it to the pulverizer 155 .

[0138] For example, dry compressed air may be caused to flow toward the separator 153 to physically peel off the sediment from the outer surface of the inner filter 152 , or the sediment may be physically peeled off from the outer surface of the inner filter 152 by the contraction and expansion structure of the inner filter 152 .

[0139] Here, by operating the on-off valve 157 formed in the pipe between the separator 153 and the pulverizer 155 , the valve can be opened during the peeling and closed when the peeling is completed.

[0140] Furthermore, the in-vessel storage unit 150 may include a filter for capturing dust generated during pulverization by the pulverizer 155 or a cyclone dust collector 158 for capturing dust, so that the captured or dust-collected powder can be supplied to the sediment storage tank 156 and only air can be discharged to the outside.

[0141] Furthermore, the turbid liquid collected outside the outer wall 151 of the separator 153 can be returned to the mixing tank 143 of the absorption liquid regeneration unit 140 through a separate pump or a combined structure of a separation pump, a valve 159 and a pipe.

[0142] Furthermore, the sediment storage tank 156 can be made of an openable and closed structure, which can unload the sediment that has completed high-temperature drying and crushed into micronized particles contained inside, or can be formed as a structure that is separated from the deck of the ship as a whole for unloading, thereby removing the captured sediment.

[0143] Next, if Figure 6 As shown, the washing water treatment section 160 may include: a washing water tank 161 for storing washing water discharged from the absorption tower 130; a water treatment device 162, equipped with a filtering unit for adjusting turbidity and a neutralizer injection unit for adjusting pH to meet the overboard discharge conditions of the washing water transferred from the washing water tank 161; and a sludge storage tank 163 for separating and storing solid discharges.

[0144] Furthermore, when the wash water treated in the water treatment device 162 is discharged to the outside of the ship, it can be dissolved (diluted) in the seawater supplied from the seawater supply unit 110 and discharged. At this time, the wash water treatment unit 160 may further include a clean water cooler 164 that cools the seawater supplied from the seawater supply unit 110 into cooling water, and the seawater cooled by the clean water cooler 164 is supplied to the wash water treated in the water treatment device 162, and is dissolved (diluted) and then discharged to the outside of the ship.

[0145] Next, if Figure 3 As shown, the absorption tower 130 may also include: EGE 134, in which NO X Absorption section 133 and SO X The absorber 132 is formed between the exhaust heat of the ship engine and the boiler water to exchange heat. Figure 7As shown, the steam generating unit 170 is composed of an auxiliary boiler 171, a boiler water circulation pump 172, a cascade tank 173, a supply pump 174 and a regulating valve 175, which generates and supplies steam required for the heating equipment in the ship, wherein the auxiliary boiler 171 receives a mixture of steam and saturated water in the form of heat exchanged through the EGE 134, separates the steam by means of a steam drum (not shown), and supplies the steam to the steam consumption point in the ship, the boiler water circulation pump 172 circulates and supplies boiler water from the auxiliary boiler 171 to the EGE 134, the cascade tank 173 recovers condensed water that is condensed and changes phase after being consumed from the steam consumption point, and the supply pump 174 and the regulating valve 175 adjust the amount of boiler water from the cascade tank 173 to the auxiliary boiler 171 and supply it.

[0146] Here, when the load of the ship engine 10 is large, the amount of steam required in the ship can be fully produced by the EGE 134 due to the high heat that can be received from the exhaust gas. However, if this is not the case, the required steam can also be produced by burning fuel in the auxiliary boiler 171 itself.

[0147] In addition, another embodiment of the present invention provides a ship or a marine structure equipped with the greenhouse gas emission reduction device for ships listed above.

[0148] Therefore, according to the configuration of the embodiment of the present invention, CO2 is captured from the exhaust gas and mineralized, crushed, and micronized before being stored on board the ship, so that it can be easily unloaded, and greenhouse gases are mineralized and stored without being discharged into the ocean, thereby reducing environmental pollution and removing NO X 、SO X and CO2, can be stored in a solid state containing small amounts of impurities such as Na2CO3, NaHCO3, (NH4)2CO3, and NH4HCO3, and can be removed by removing SO X Afterwards, CO2 can be removed to suppress the formation of SO2 remaining in the exhaust gas. X The side reactions caused by the reaction can improve the CO2 solubility and CO2 removal efficiency.

[0149] The embodiments described in this specification and the structures shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, it should be understood that there may be a variety of equivalents and modifications that can replace these at the node of this application.

Claims

1. A greenhouse gas emission reduction device for a ship, comprising: An absorption liquid circulation supply unit, which provides an absorption liquid for absorbing CO2 and circulates the absorption liquid; An exhaust gas cooling unit, which cools the exhaust gas discharged from the ship's engine; an absorption tower including a CO2 removal section for reacting the cooled exhaust gas with the absorption liquid to convert CO2 into a carbonate aqueous solution and capture CO2; an absorbing liquid regeneration unit that regenerates the absorbing liquid by reacting the carbonate aqueous solution with a regeneration reactant and generates a precipitate; as well as The onboard storage unit separates the sediment and stores it onboard.

2. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The onboard storage unit separates, dries, and micro-particles the sediment to store it onboard.

3. The greenhouse gas emission reduction device for a ship according to claim 2, characterized in that: The in-vessel storage unit separates the sediment by filtering the turbid liquid mixed with the sediment and the absorption liquid, dries and peels off the sediment by high-temperature dry air, and pulverizes and atomizes the sediment while supplying high-temperature compressed air.

4. The greenhouse gas emission reduction device for a ship according to claim 3, characterized in that: The in-vessel storage unit comprises: A separator, comprising an outer wall and an inner filter, wherein the turbid liquid flows into between the outer wall and the inner filter to accumulate solid precipitates between the outer wall and the inner filter, and the absorption liquid returns to the absorption liquid circulation supply unit or the absorption liquid regeneration unit; An air heater blows high-temperature dry air to the separator to dry the precipitate at high temperature; A pulverizer, which is composed of an inner rotating cylinder and an outer rotating cylinder, each of which is formed with a grid of a predetermined size, so that the high-temperature dried precipitate passes between the inner rotating cylinder and the outer rotating cylinder to be pulverized and uniformly micronized; and The sediment storage tank stores and contains the crushed sediment.

5. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: The air heater provides the high-temperature dry air by blowing the high-temperature dry air toward the pulverizer.

6. The greenhouse gas emission reduction device for a ship according to claim 5, characterized in that: The air heater heats the air at 90° C. to 100° C. to provide the high-temperature dry air.

7. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: When the separation and high-temperature drying of the precipitate are completed in the separator, the separator peels off the precipitate attached to the outer surface of the inner filter and discharges the precipitate to the pulverizer.

8. The greenhouse gas emission reduction device for a ship according to claim 7, characterized in that: The precipitate is stripped off by flowing compressed air to the separator.

9. The greenhouse gas emission reduction device for a ship according to claim 7, characterized in that: The sediment is removed by the contraction and expansion structure of the internal filter.

10. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: A filter or a cyclone dust collector is included, the filter captures dust generated when the pulverizer is pulverized, and the cyclone dust collector collects the dust, thereby supplying the captured powder or the collected powder to the sediment storage tank.

11. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: The precipitate comprises carbonates, The absorption liquid is a monovalent alkaline aqueous solution and includes one of a LiOH aqueous solution, a NaOH aqueous solution, a KOH aqueous solution and an NH4OH aqueous solution.

12. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: Also includes: Seawater supply department, supplying seawater from outside the ship, Wherein, the seawater supply unit comprises: A seawater pump receives the seawater from outside the ship through a seabed suction box and pumps the seawater into the absorption tower; and The seawater regulating valve adjusts the injection amount of the seawater supplied from the seawater pump to the absorption tower according to the amount of the exhaust gas.

13. The greenhouse gas emission reduction device for a ship according to claim 12, characterized in that: The exhaust gas cooling unit cools the exhaust gas discharged from the ship engine by causing the exhaust gas to react with the seawater supplied from the seawater supply unit.

14. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The exhaust gas cooling unit cools the exhaust gas discharged from the ship engine by causing it to react with clean water.

15. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The exhaust gas cooling unit cools the exhaust gas by circulating clean water supplied from an in-vessel cooling system through a heat exchange pipe surrounding the exhaust gas discharge pipe.

16. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The exhaust gas cooling unit is disposed inside the absorption tower.

17. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The absorption liquid circulation supply unit comprises: An absorption liquid storage tank, used for storing the absorption liquid; an absorption liquid pump for pumping the absorption liquid from the absorption liquid storage tank for transfer; an absorption liquid circulation tank that mixes and stores the carbonate aqueous solution discharged from the absorption tower and the absorption liquid supplied from the absorption liquid pump; and An absorbent circulation pump supplies the absorbent from the absorbent circulation tank to the upper end of the CO 2 removal section to circulate the absorbent.

18. The greenhouse gas emission reduction device for a ship according to claim 17, characterized in that: The absorption liquid pump supplies the absorption liquid to the absorption liquid circulation tank to make up for a shortage of the absorption liquid discharged to the in-vessel storage unit.

19. The greenhouse gas emission reduction device for a ship according to claim 17, characterized in that: The absorption liquid is generated by electrolyzing seawater and clean water respectively, and is stored in the absorption liquid storage tank.

20. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: Also includes: Seawater supply department, supplying seawater from outside the ship, Wherein, the exhaust gas cooling unit is arranged inside the absorption tower, The absorption tower as the exhaust gas cooling unit also includes SO X Absorption part, the SO X The absorption unit cools the exhaust gas by reacting with the seawater supplied from the seawater supply unit, while dissolving and removing SO X , The CO2 removal unit cools and removes SO X The exhaust gas reacts with the absorbent supplied from the absorbent circulation unit to convert CO 2 into a carbonate aqueous solution, thereby capturing CO 2 .

21. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: Also includes: Seawater supply department, supplying seawater from outside the ship, The absorption tower also includes a NO absorber that absorbs and removes the waste gas. X NO X Absorption part, The exhaust gas cooling unit is installed inside the absorption tower so that the removed NO X The exhaust gas is cooled by reacting with the seawater supplied from the seawater supply unit, The CO 2 removal unit captures CO 2 by converting CO 2 into a carbonate aqueous solution by reacting the cooled exhaust gas with the absorbent supplied from the absorbent circulation unit.

22. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: Also includes: Seawater supply department, supplying seawater from outside the ship, Wherein, the exhaust gas cooling unit is arranged inside the absorption tower, Wherein, the absorption tower is stacked in sequence to form: NO X Absorption unit absorbs and removes NO in exhaust gas X ; SO X The absorption part, as the exhaust gas cooling part, removes the NO X The exhaust gas reacts with the seawater supplied from the seawater supply unit to dissolve and remove SO X ;as well as The CO2 removal unit cools and removes SO X The exhaust gas reacts with the absorbent supplied from the absorbent circulation unit to capture and remove CO 2 by converting CO 2 into a carbonate aqueous solution.

23. The greenhouse gas emission reduction device for a ship according to claim 21 or 22, characterized in that: The NO X The absorption section includes a selective catalyst reactor.

24. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The absorption liquid regeneration unit comprises: A regeneration reactant storage tank for storing the regeneration reactant; a transfer pump for pumping and transferring the carbonate aqueous solution; and A mixing tank is used to mix the regeneration reactant with the carbonate aqueous solution to react and regenerate the absorption liquid to generate solid carbonate, and return the regenerated absorption liquid to the absorption tower.

25. The greenhouse gas emission reduction device for a ship according to claim 24, characterized in that: The regeneration reactant includes a divalent metal oxide or a divalent metal hydroxide.

26. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: Also includes: The washing water treatment unit consists of a washing water tank, a water treatment device and a sludge storage tank. The washing water tank stores the washing water discharged from the absorption tower. The water treatment device is equipped with a filtration unit for adjusting turbidity and a neutralizer injection unit for adjusting pH to meet the overboard discharge conditions of the wash water transferred from the wash water tank, The sludge storage tank is used to separate and store solid effluent.

27. The greenhouse gas emission reduction device for a ship according to claim 26, characterized in that: Also includes: Seawater supply department, supplying seawater from outside the ship, When the wash water treated in the water treatment device is discharged overboard, the wash water is dissolved or diluted in the seawater supplied from the seawater supply unit before being discharged.

28. The greenhouse gas emission reduction device for a ship according to claim 26, characterized in that: The washing water treatment unit also includes: The fresh water cooler cools the seawater supplied from the seawater supply unit into cooling water.

29. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The exhaust gas cooling unit branches at least a portion of the exhaust gas discharged from the ship engine to cool the exhaust gas. The CO 2 removal unit causes the cooled exhaust gas to react with the absorbent to convert CO 2 into the carbonate aqueous solution, thereby capturing CO 2 .

30. The greenhouse gas emission reduction device for a ship according to claim 29, characterized in that: include: The air supply unit supplies at least a portion of the branched exhaust gas to the exhaust gas cooling portion.

31. The greenhouse gas emission reduction device for a ship according to claim 30, characterized in that: The air supply unit is a blower.

32. The greenhouse gas emission reduction device for a ship according to claim 29, characterized in that: The remaining exhaust gas from the ship engine that is not branched to the exhaust gas cooling unit is discharged through the main exhaust pipe. At least a portion of the exhaust gas branched to the exhaust gas cooling unit is exhausted by being joined to the main exhaust pipe after CO 2 is captured, or is exhausted through a separate exhaust pipe.

33. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: The sediment storage tank is constructed in an openable and closed structure to unload the sediment stored therein, or is constructed in a structure separated from the deck of the ship to unload the sediment stored therein.

34. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: The air heater heats air using waste heat of exhaust gas exhausted from the ship engine.

35. A ship or marine structure comprising the greenhouse gas emission reduction device for a ship according to any one of claims 1 to 22.

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