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 is provided with a seawater supply unit (110), an absorption liquid circulation supply unit (120), an absorption tower (130), an absorption liquid regeneration unit (140), and an outboard discharge unit (150) so as to mineralize CO2 and discharge the mineralized CO2 to the outside of the ship, and to minimize the corrosion of seawater to a separator (152), the present invention relates to a ship engine (10) comprising a seawater supply unit (110) that supplies seawater, an absorption liquid circulation supply unit (120) that supplies and circulates an absorption liquid that absorbs CO2, and an absorption tower (130) comprising a CO2 removal unit (131) that cools off-gas discharged from the ship engine (10) by reacting the off-gas with seawater, and that converts CO2 into an aqueous carbonate solution by reacting the cooled off-gas with the absorption liquid, the present invention is provided with an absorption liquid regeneration unit (140) for regenerating an absorption liquid and generating a precipitate by reacting an aqueous carbonate solution with a divalent metal oxide or a divalent metal hydroxide, and an outboard discharge unit (150) for separating the precipitate and discharging the precipitate to the outside of the ship by means of seawater.

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, and more particularly to a method for reducing CO 2 A greenhouse gas emission reduction device for a ship, which can discharge the gas overboard by satisfying the discharge conditions after mineralization and can minimize the corrosion of the separator by seawater, and a ship or marine structure equipped with the same. Background Art

[0002] Recently, due to the influence of greenhouse gas emissions caused by the uncontrolled use of fossil fuels, global warming and related environmental disasters 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 must be reduced by 40% from 2008 levels by 2030, no CO2 emissions are required. 2 or capture emitted CO 2 technology has attracted much attention.

[0005] For reference, CO2 directly captured and stored in CCS technology 2 Capture technology can be used to capture CO 2 The current representative technologies are absorption, adsorption and membrane separation. Among them, wet absorption is more mature and easier to use for land-based plants. 2 It can be said that it is the capture technology closest to commercialization in CCS technology, and amine series 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, SOX The solubility is large and it first turns into NaSO 3 compounds, so there is until SO X It is difficult to remove CO before all the dissolved 2 The disadvantages of 2 However, the use of a separate consumable absorbing liquid raw material causes a problem of increased greenhouse gas removal costs.

[0008] Therefore, for ships that do not have a separate consumable absorbent raw material and use fossil fuels, it is necessary to apply CO2 in the exhaust gas discharged from the ship's engine to the ship. 2 Technology that converts waste into substances that do not affect the environment and then discharges them, or converts them into useful substances and then stores them. Summary of the invention

[0009] Technical issues

[0010] The technical problem to be achieved by the idea of ​​the present invention is to provide a method for converting CO 2 A greenhouse gas emission reduction device for a ship, which can discharge the gas overboard by satisfying the discharge conditions after mineralization and can minimize the corrosion of the separator by seawater, and a ship or marine structure equipped with the same.

[0011] Technical Solution

[0012] In order to achieve the above-mentioned object, an embodiment of the present invention provides a greenhouse gas emission reduction device for a ship, comprising: an absorption liquid circulation supply unit, providing an absorption liquid for absorbing CO 2 an exhaust gas cooling unit for cooling the exhaust gas discharged from the ship engine; an absorption tower comprising a step of reacting the cooled exhaust gas with the absorption liquid to convert CO 2 Converting to carbonate aqueous solution to capture CO 2 CO 2 a removal unit; an absorbent regeneration unit, which regenerates the absorbent by reacting the carbonate aqueous solution with a regeneration reactant and generates a precipitate; and an overboard discharge unit, which separates the precipitate and discharges the precipitate to the outside of the ship by means of seawater.

[0013] Here, the overboard discharge unit may perform a separation process of the sediment and the absorption liquid, a discharge process of the sediment using the seawater, and may also perform a cleaning process using clean water.

[0014] At this time, the overboard discharge section can suck in and separate the sediment and the absorption liquid from the absorption liquid regeneration section. In order to make the sediment meet the overboard discharge conditions, the seawater is used to dilute the sediment and discharge it overboard. If the sediment does not meet the overboard discharge conditions, the sediment can be temporarily stored.

[0015] Specifically, the off-board discharge section may include: a separation pump, which sucks the sediment and the absorption liquid from the absorption liquid regeneration section; a separator, which separates the sediment and the absorption liquid transferred from the separation pump so that the sediment is discharged outside the ship and the absorption liquid is returned to the absorption liquid circulation supply section; and a discharge seawater pump, which supplies the seawater to the separator, dilutes the sediment and discharges it outside the ship.

[0016] Here, the separator may be a filter-type separator or a centrifugal separator-type separator that separates the precipitate and the absorption liquid from each other.

[0017] Furthermore, the overboard discharge unit may further include a clean water supply valve configured to clean the separator by supplying the clean water to the separator.

[0018] Here, the overboard discharge unit may further include a fresh water cooler configured to cool the seawater supplied to the discharge seawater pump into cooling fresh water.

[0019] At this time, the precipitate discharged from the separator may be supplied with seawater cooled by the clean water cooler to be diluted and discharged outside the ship.

[0020] Furthermore, the overboard discharge unit may include a sensor for measuring one or more of the turbidity, pH and oil content of the sediment separated from the separator, and discharge the sediment to the outside of the ship or temporarily store it according to whether an overboard discharge condition corresponding to the measurement value of the sensor is met.

[0021] Furthermore, the precipitate may contain carbonates, and the absorption liquid is a monovalent alkaline aqueous solution and contains a LiOH aqueous solution, a NaOH aqueous solution, a KOH aqueous solution, and a NH 4 One of the OH aqueous solutions.

[0022] 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.

[0023] 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.

[0024] Furthermore, the exhaust gas cooling unit may cool the exhaust gas discharged from the ship engine by reacting with clean water.

[0025] 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.

[0026] Furthermore, the exhaust gas cooling unit may be disposed inside the absorption tower.

[0027] Furthermore, the absorption liquid circulation supply unit 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 CO 2 The upper end of the removal part supplies the absorption liquid to circulate the absorption liquid.

[0028] 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 outside of the ship through the outside discharge part.

[0029] Furthermore, the absorption liquid can be generated by electrolyzing seawater and clean water respectively, and stored in the absorption liquid storage tank.

[0030] Furthermore, 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, and the absorption tower further includes SO X The absorption section serves as the exhaust gas cooling section, and the SO X The absorption unit cools the exhaust gas by reacting with the seawater supplied from the seawater supply unit, dissolving and removing SO X , the CO 2 The removal part cools and removes SO X The exhaust gas reacts with the absorbent from the absorbent circulation supply unit to convert CO 2 Converted to carbonate aqueous solution to capture CO 2 .

[0031] 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 reacts with the seawater supplied from the seawater supply unit to be cooled, and the CO 2 The removal unit reacts the cooled exhaust gas with the absorbent from the absorbent circulation supply unit to remove CO 2 Converted to carbonate aqueous solution to capture CO 2 .

[0032] Alternatively, it 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 The absorption part absorbs and removes NO in the 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 be cooled, dissolving and removing SO X ; and the CO 2 The removal part cools and removes SO X The exhaust gas reacts with the absorption liquid from the absorption liquid circulation supply section to convert CO 2 Converted into carbonate aqueous solution for capture and removal of CO 2 .

[0033] Furthermore, the NO X The absorption section may include a selective catalyst reactor (SCR: Selective Catalyst Reactor).

[0034] Here, the NO X The absorption unit may further include: a urea water storage tank storing urea water; and a urea water supply pump sucking urea water from the urea water storage tank and supplying the urea water to an injection nozzle inserted into a lower end of the SCR.

[0035] Furthermore, the SO X The absorption part may include: a flow path for the exhaust gas to pass through; and a plurality of seawater injection nozzles for injecting the seawater supplied from the seawater supply part downward by opening and closing the seawater regulating valve, thereby dissolving SO X And remove dust, and cool the exhaust gas.

[0036] 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.

[0037] Furthermore, the flow path may be formed with a plurality of stacked plates in which holes for exhaust gas to pass are cross-arranged and separated up and down, a structure forming a curved flow path, or an absorbent filled with fillers, and a partition or umbrella-shaped blocking plate may be formed to prevent backflow of washing water.

[0038] Furthermore, the CO 2The 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 waste 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 waste gas and the absorption liquid undergo a second reaction.

[0039] Here, the CO 2 The removal part may further include: a demisting plate having a curved multi-plate structure, formed at the upper end of the second spray nozzle and cutting off the absorption liquid from being discharged to the outside; and a blocking plate in the form of a partition or an umbrella to prevent the absorption liquid from flowing back.

[0040] Furthermore, the CO 2 The removal portion may include a cooling sleeve for cooling heat generated in the first filler and the second filler.

[0041] Furthermore, the CO 2 The removal unit may adjust the spray amount of the absorbing liquid by monitoring pH according to the degree of reaction in the first filler and the second filler.

[0042] 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.

[0043] Here, the regeneration reactant may include a divalent metal oxide or a divalent metal hydroxide.

[0044] In addition, the greenhouse gas emission reduction device of the ship may also include: a washing water treatment unit, which is composed of a washing water tank, a water treatment device and a sludge storage tank, wherein the washing water tank stores 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 washing water transferred from the washing water tank, and the sludge storage tank is used to separate and store solid discharges.

[0045] 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's engine and the boiler water.

[0046] 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 and separates the steam, and supplies it to a steam consumption site, the boiler water circulation pump circulates boiler water from the auxiliary boiler to the EGE, the cascade tank recovers condensed water from the steam consumption site, and the supply pump and the regulating valve adjust the amount of boiler water from the cascade tank to the auxiliary boiler and supplies it.

[0047] 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 The removal part allows the cooled exhaust gas to react with the absorbent to remove CO 2 Converted into the carbonate aqueous solution, thereby capturing CO 2 .

[0048] 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.

[0049] At this time, the air supply unit may be a blower.

[0050] Furthermore, the remaining 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 is cooled in the CO 2 After being captured, the gas can be merged into the main exhaust pipe for discharge, or can be discharged through a separate exhaust pipe.

[0051] In addition, in order to achieve the above-mentioned object, another embodiment of the present invention provides a ship or a marine structure equipped with the aforementioned greenhouse gas emission reduction device for the ship.

[0052] Beneficial Effects

[0053] According to the present invention, the carbonate separated by the separator is discharged overboard using seawater, the corrosion of the separator caused by seawater can be prevented by washing with clean water, greenhouse gas is mineralized to reduce environmental pollution, and the greenhouse gas-capturing substance is discharged to the ocean without the need for additional storage facilities and loading and unloading facilities, while NO X 、SO X and CO 2 , can be treated with small amounts of impurities (such as Na 2 CO 3 、NaHCO 3 NH 4 ) 2 CO 3and NH 4 HCO 3 ) in a solid state and remove SO X Afterwards, CO is removed 2 , in order to suppress the residual SO in the exhaust gas X The side reactions caused by this increase in CO 2 Solubility and CO 2 Removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 2 It is a graphic presentation Figure 1 System circuit diagram of the greenhouse gas emission reduction device of the ship.

[0056] Figure 3 It is a separation diagram Figure 2 Diagram of the seawater supply unit and absorption tower.

[0057] Figure 4 It is a separation diagram Figure 2 Diagram of the absorption liquid circulation supply section and the absorption liquid regeneration section.

[0058] Figure 5 It is a separation diagram Figure 2 Diagram of the overboard discharge section.

[0059] Figure 6 It is a separation diagram Figure 2 Diagram of the wash water treatment section.

[0060] Figure 7 It is a separation diagram Figure 2 Figure 2 shows a diagram of a steam generating section.

[0061] Figure 8 It is an example showing Figure 3 Diagram of the CO2 removal section.

[0062] Fig. 9 It is an example showing Figure 5 Diagram of the separation process in the overboard discharge process.

[0063] Fig.10 It is an example showing Figure 5 Diagram of the discharge process in the overboard discharge part.

[0064] Fig.11 It is an example showing Figure 5 Diagram of the cleaning process in the overboard discharge process. DETAILED DESCRIPTION

[0065] Hereinafter, embodiments of the present invention having the above-mentioned features will be described in more detail with reference to the accompanying drawings.

[0066] The greenhouse gas emission reduction device for a ship according to an embodiment of the present invention comprises a seawater supply unit 110, an absorption liquid circulation supply unit 120, an absorption tower 130, an absorption liquid regeneration unit 140 and an overboard discharge unit 150, so as to reduce CO 2 The mineralization is carried out and discharged outside the ship, and the corrosion of the seawater to the separator 152 is minimized, wherein the seawater supply part 110 supplies seawater, and the absorption liquid circulation supply part 120 provides the absorption liquid of CO 2 The absorption liquid is circulated, and the absorption tower 130 includes CO 2 Removal unit 131, the CO 2 The removal unit 131 cools the exhaust gas discharged from the ship engine 10 by reacting it with seawater, and reacts the cooled exhaust gas with an absorbing liquid to remove CO. 2 Converted to carbonate aqueous solution to capture CO 2 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 overboard discharge unit 150 separates the precipitate, discharges the precipitate overboard with seawater, and washes it with clean water.

[0067] Here, the absorption tower may be configured to include, in addition to CO, the following components, 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.). 2 In addition to the removal section, optionally including NO X Absorption part or SO X Absorbing part, or including all.

[0068] 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.

[0069] The following describes the process of stacking NO in the absorption tower. X Absorption section, SO as exhaust gas cooling section X Absorption unit, CO 2The present invention is an embodiment of the removal part, but is not limited to this.

[0070] 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 absorbent to absorb CO 2 The absorption of seawater is smooth, using SO X The 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.

[0071] 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.

[0072] Below, refer to Figures 1 to 11 , specifically and in detail describing the composition of the greenhouse gas emission reduction device of the aforementioned ship.

[0073] First, the seawater supply unit 110 is a structure for supplying seawater to the absorption tower 130 and the overboard discharge unit 150. 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, according to the amount of exhaust gas to adjust the seawater pump 112 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.

[0074] 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.

[0075] 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.

[0076] Next, the absorption liquid circulation supply unit 120 is used to provide the CO contained in the absorption exhaust gas. 2 The absorption liquid is circulated to the absorption tower 130. Specifically, Figure 2 and Figure 4 As shown, the absorption liquid circulation supply unit 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 an absorption liquid circulation tank 123; an absorption liquid circulation tank 123 for mixing and storing the carbonate aqueous solution discharged from the absorption tower 130 and the absorption liquid supplied from the absorption liquid pump 122; and an absorption liquid circulation pump 124 for pumping the absorption liquid from the absorption liquid circulation tank 123 to the CO 2 The upper end of the removal part 131 supplies the absorption liquid and circulates it.

[0077] In this case, the absorption liquid may include an aqueous solution of lithium hydroxide (LiOH), an aqueous solution of sodium hydroxide (NaOH), an aqueous solution of potassium hydroxide (KOH), or an aqueous solution of ammonia (NH 4 OH) aqueous solution, preferably, it can be a monovalent alkaline aqueous solution such as NaOH aqueous solution and / or NH 4 OH aqueous solution.

[0078] Here, in the first step of converting the exhaust gas into a carbonate aqueous solution by reacting the exhaust gas with an absorbent which is a monovalent alkaline aqueous solution, the CO 2 It reacts with water to generate carbonic acid (H 2 CO 3 ). At this time, with CO 2 The water of reaction may be water coexisting in the monovalent alkaline aqueous solution as the absorbing liquid.

[0079] [Chemical formula 1]

[0080] CO 2 +H 2 O→H 2 CO 3

[0081] After the first step, when the monovalent alkaline aqueous solution as the absorption liquid is a NaOH aqueous solution, sodium bicarbonate (NaHCO) as a carbonate is generated by the following [Chemical Formula 2] 3 ) or sodium carbonate (Na 2 CO 3 ) and water, thereby converting into a carbonate aqueous solution.

[0082] [Chemical formula 2]

[0083] NaOH+H 2 CO 3 →NaHCO 3 +H2 O

[0084] 2NaOH+H 2 CO 3 →Na 2 CO 3 +2H 2 O

[0085] Alternatively, after the first step, the monovalent alkaline aqueous solution as the absorption liquid is NH 4 In the case of an aqueous solution of OH, ammonium bicarbonate (NH 4 HCO 3 ) or ammonium carbonate (NH 4 ) 2 CO 3 ) and water, thereby converting into a carbonate aqueous solution.

[0086] [Chemical formula 3]

[0087] NH 4 OH+H 2 CO 3 →NH 4 HCO 3 +H 2 O

[0088] 2NH 4 OH+H 2 CO 3 →(NH 4 ) 2 CO 3 +2H 2 O

[0089] The absorption liquid pump 122 discharges the solid CaCO 3 When the carbonate is separated and discharged overboard, a portion of the absorbent is discharged overboard together with the carbonate. Therefore, a predetermined amount of absorbent may be supplied to the absorbent circulation tank 123 to fill the insufficient amount of absorbent.

[0090] In addition, the absorption liquid of the NaOH aqueous solution 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).

[0091] For reference, in the absorption tower 130, the absorption liquid may contact the exhaust gas to make the CO 2 The ionized absorption liquid can flow into the absorption liquid circulation tank 123, and then 2The absorbent discharged from the removal unit 131 contains CO 3 2- CO 2 When all absorption occurs, HCO 3 - The concentration of ions is high, CO 3 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 which exists in the form of ions. 2 Dissolved, HCO 3 - The concentration of ions can be increased, allowing continuous use of CO 2 Absorb until the desired concentration is reached.

[0092] Next, the absorption tower 130 may include: CO 2 The removal unit 131 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 absorbing liquid to remove CO 2 Converted to carbonate aqueous solution to capture CO 2 .

[0093] For example, the absorption tower 130 may further include: SO X The absorption unit 132 cools the exhaust gas by reacting with seawater supplied from the seawater supply unit 110, dissolving and removing SO X , where CO 2 The removing unit 131 makes the removed SO X The exhaust gas reacts with the 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 CO 2 .

[0094] Alternatively, the absorption tower 130 may further include: NO X The absorption unit 133 absorbs and removes NO in the exhaust gas. X , where CO 2 The removal unit 131 removes NO X The exhaust gas reacts with the 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 CO 2 .

[0095] Alternatively, the absorption tower 130 may be stacked in sequence to form a NO X Absorption part 133, SO X Absorption unit 132 and CO 2 Removal unit 131, wherein the NOX 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 be cooled, dissolving and removing SO X , the CO 2 The removing unit 131 makes the removed 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 CO 2 .

[0096] Specifically, refer to Figure 3 , CO 2 The 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 waste 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 waste gas and the absorption liquid undergo a second reaction.

[0097] 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 spray the absorbing liquid downward.

[0098] And, if Figure 8 As shown, CO 2 The removal part 131 may also include: a defogger plate 131e having a curved multi-plate structure, formed at the upper end of the second spray nozzle 131c and forming droplets to block the absorption liquid from 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.

[0099] Moreover, CO 2 The removal unit 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 reduce the temperature of the absorbent supplied from the first injection nozzle 131a and the second injection nozzle 131c by 10°C to 20°C to reduce the temperature of the exhaust gas in the CO 2 The heat absorbed by the absorbent increases the absorption rate while making H 2 The loss of O due to gasification is minimized.

[0100] 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.

[0101] Moreover, CO 2 The removal unit 131 may monitor the pH corresponding to the degree of reaction in the first filler 131 b and the second filler 131 d through the pH sensor P, and may adjust the amount of the absorbing liquid sprayed through the first spray nozzle 131 a and the second spray nozzle 131 c .

[0102] 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.

[0103] And, SO X The absorbing 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 measured temperature.

[0104] Furthermore, the flow path 132a may be provided with a plurality of stacked plates in which holes for the exhaust gas to pass are cross-arranged and separated up and down, a structure forming a curved flow path, or an absorbent filled with a filler, thereby increasing the contact area between seawater and the exhaust gas to facilitate cooling and absorption, and a partition wall 132c or an umbrella-shaped blocking plate 132d may be formed to prevent backflow of washing water.

[0105] Therefore, through SO X The absorption unit 132 first removes SO X After CO 2 The removal unit 131 removes CO 2 , solved on SO X The solubility is large, causing it to become Na first 2 SO 4 Compounds such as SO X It is difficult to remove CO before it is completely dissolved2 problems, thus increasing CO 2 removal efficiency.

[0106] For reference, from SO X The washing water discharged from the lower end of the absorption part 132 may also contain SO 3 - 、SO 4 2- , soot, NaSO 3 、Na 2 SO 4 MgCO 3 MgSO 4 And other ionic compounds.

[0107] In addition, NO X The absorption part 133 includes a selective catalyst reactor (SCR) 133 c and may include a urea water storage tank 133 a storing urea water and a urea water supply pump 133 b sucking urea water from the urea water storage tank 133 a and supplying the urea water to an injection nozzle inserted into a lower end of the SCR 133 c .

[0108] 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 between them, so that the waste heat of the ship engine 10 and the boiler water can be heat-exchanged.

[0109] 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 CO 2 Switching to aqueous carbonate solutions to capture CO 2 .

[0110] That is, at least a part of the exhaust gas is branched and supplied to the SO X The air supply unit (not shown) 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.

[0111] Here, the air supply unit may be composed of a blower. Preferably, the air supply unit is provided with a SO XIn the case of the absorption section 132, the blower 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 is designed to blow or pressurize the exhaust gas at about 300°C.

[0112] 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, and at least a part of the exhaust gas branched to the absorption tower 130 can be discharged in the CO 2 After being captured, it is merged into the main exhaust pipe for discharge, or it can be discharged through a separate exhaust pipe.

[0113] 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.

[0114] Specifically, refer to Figure 4 The absorption liquid regeneration unit 140 may include: a regeneration reactant storage tank 141 for storing a divalent metal oxide (CaO) or a divalent metal hydroxide (Ca(OH) 2 ) regeneration reactant; a transfer pump 142, which sucks the carbonate aqueous solution from the absorption liquid circulation tank 123 and transfers it to the mixing tank 143; and the mixing tank 143, which mixes the regeneration reactant and the carbonate aqueous solution and reacts to regenerate the absorption liquid to generate a solid carbonate (CaCO 3 (s)), and the regenerated absorption liquid is returned to the absorption tower 130 for reuse.

[0115] First, in NaOH and CO 2 Sodium bicarbonate (NaHCO) reacts to form carbonate 3 ) or sodium carbonate (Na 2 CO 3 ), sodium bicarbonate (NaHCO 3 ) or sodium carbonate (Na 2 CO 3 ) reacts with calcium oxide (CaO) to regenerate NaOH and generate carbonate CaCO through the following [chemical formula 4] 3 , or by the following [chemical formula 5] with calcium hydroxide (Ca(OH) 2 ) reaction to regenerate NaOH and generate carbonate CaCO 3 .

[0116] [Chemical formula 4]

[0117] NaHCO 3 +CaO→NaOH+CaCO 3

[0118] Na 2 CO 3 +CaO+H 2 O→2NaOH+CaCO 3

[0119] [Chemical formula 5]

[0120] NaHCO 3 +Ca(OH) 2 →NaOH+CaCO 3 +H 2 O

[0121] Na 2 CO 3 +Ca(OH) 2 →2NaOH+CaCO 3

[0122] Or, in NH 4 OH and CO 2 The reaction produces ammonium bicarbonate (NH 4 HCO 3 ) or ammonium carbonate (NH 4 ) 2 CO 3 ) is the carbonate, ammonium bicarbonate (NH 4 HCO 3 ) or ammonium carbonate (NH 4 ) 2 CO 3 ) can be reacted with calcium oxide (CaO) to regenerate NH 4 OH and the carbonate CaCO 3 , or by the following [chemical formula 7] with calcium hydroxide (Ca(OH) 2 ) reaction to regenerate NH 4 OH and the carbonate CaCO 3 .

[0123] [Chemical formula 6]

[0124] NH 4 HCO 3 +CaO→NH 4 OH+CaCO 3

[0125] (NH 4 ) 2 CO 3 +CaO → +H 2 O→2NH 4 OH+CaCO 3

[0126] [Chemical formula 7]

[0127] NH 4 HCO 3 +Ca(OH) 2 →NH 4 OH+CaCO 3 +H 2 O

[0128] (NH 4 ) 2 CO 3 +Ca(OH) 2 →2NH 4 OH+CaCO 3

[0129] Here, if the HCO in the absorption liquid circulation tank 123 3 - When the ion concentration increases, the absorption liquid is transferred to the mixing tank 143 by the transfer pump 142. During the mineralization process of the subsequent process, the absorption liquid can also be continuously absorbed by the mixing tank 143. 2 The absorbing liquid is transferred at a concentration of a certain degree.

[0130] Furthermore, the mixing tank 143 makes CO 2 The ionized absorbent and CaO or Ca(OH) 2 The absorption liquid is regenerated by reaction, and CO 2 Converted to CaCO 3 morphology, from CaO or Ca(OH) 2 Supply OH - Ion, CO 3 - Ions can react with Ca 2+ Ions combine to form a solid, insoluble CaCO 3 .

[0131] Next, the overboard discharge unit 150 separates CaCO 3 The sediment of (s) is discharged overboard by seawater in the form of sediment basically contained in the marine environment and washed with clean water.

[0132] That is, the outboard discharge unit 150 can sequentially perform Fig. 9 Separation process of precipitate and absorption liquid along the indicated path P1, Fig.10 The discharge process of the sediment by seawater along the indicated path P2, Fig.11 The indicated path P3 is a cleaning process using clean water.

[0133] In addition, the overboard discharge section 150 sucks in and separates the sediment and the absorption liquid from the absorption liquid regeneration section 140. In order to make the sediment meet the overboard discharge conditions, the sediment is diluted with seawater and discharged overboard. If the sediment does not meet the overboard discharge conditions, the sediment can be temporarily stored in another storage tank (not shown).

[0134] For example, the overboard discharge unit 150 includes sensors (not shown) for measuring the turbidity, pH and oil content of the sediment separated from the separator 152, and discharges the sediment to the overboard or temporarily stores the sediment depending on whether the overboard discharge conditions corresponding to the measured values ​​of the sensors are met.

[0135] Specifically, refer to Figure 5 The overboard discharge section 150 may include: a separation pump 151, which sucks the precipitate and the absorption liquid from the absorption liquid regeneration section 140; a separator 152, which separates the precipitate and the absorption liquid transferred from the separation pump 151, so that the precipitate is discharged overboard and the absorption liquid is returned to the absorption liquid circulation supply section 120; and a discharge seawater pump 153, which supplies cooled seawater to the separator 152, dilutes the precipitate and discharges it overboard; and a cooling seawater pump 154, which supplies cooling seawater from the seabed suction box 111 to the discharge seawater pump 153.

[0136] Here, the separator 152 may be a filter-type separator or a centrifugal separator-type separator that separates the precipitate and the absorption liquid from each other.

[0137] Furthermore, the overboard discharge unit 150 may further include a clean water supply valve 155 for cleaning the separator 152 by supplying clean water to the separator 152, thereby preventing seawater corrosion and the mixing of seawater with the regenerated absorption liquid.

[0138] Furthermore, the overboard discharge unit 150 may further include a clean water cooler 156 for cooling the seawater supplied to the discharge seawater pump 153 into cooling clean water, thereby supplying the cooled seawater from the clean water cooler 156 to the sediment discharged from the separator 152, and diluting the sediment for discharge overboard.

[0139] 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.

[0140] Next, if Figure 3 As shown, the absorption tower 130 may also include: EGE 134, in which NOX 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 7 As 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.

[0141] 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.

[0142] 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.

[0143] Therefore, according to the configuration of the embodiment of the present invention, the carbonate separated by the separator is discharged overboard using seawater, the corrosion of the separator caused by seawater can be prevented by washing with clean water, the greenhouse gas is mineralized to reduce environmental pollution, and the greenhouse gas-capturing substance is discharged to the ocean without the need for additional storage facilities and loading and unloading facilities, while removing NO X 、SO X and CO 2 , can contain small amounts of 2 CO 3 、NaHCO 3 NH 4 ) 2 CO 3 and NH 4 HCO 3 The impurities are stored in a solid state and the SO X Afterwards, CO can be removed 2 To suppress the SO XThe side reactions caused by this increase in CO 2 Solubility and CO 2 Removal efficiency.

[0144] 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 overboard discharge unit separates the sediment and discharges the sediment overboard with seawater.

2. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The overboard discharge unit performs a separation process of the sediment and the absorption liquid, a discharge process of the sediment by the seawater, and also performs a washing process by clean water.

3. The greenhouse gas emission reduction device for a ship according to claim 2, characterized in that: The overboard discharge section sucks in and separates the sediment and the absorption liquid from the absorption liquid regeneration section, and dilutes the sediment with the seawater and discharges it overboard so that the sediment meets the overboard discharge conditions. When the sediment does not meet the overboard discharge conditions, the sediment is temporarily stored.

4. The greenhouse gas emission reduction device for a ship according to claim 3, characterized in that: The overboard discharge unit comprises: a separation pump for sucking the precipitate and the absorption liquid from the absorption liquid regeneration section; a separator for separating the sediment transferred from the separation pump from the absorption liquid so as to discharge the sediment overboard and return the absorption liquid to the absorption liquid circulation supply unit; and The discharge seawater pump supplies the seawater to the separator, dilutes the sediment, and discharges the sediment to the outside of the ship.

5. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: The separator is a filter-type separator or a centrifugal separator-type separator that separates the precipitate and the absorbing liquid from each other.

6. The greenhouse gas emission reduction device for a ship according to claim 4, characterized in that: The overboard discharge unit further comprises: A clean water supply valve cleans the separator by supplying the clean water to the separator.

7. The greenhouse gas emission reduction device for a ship according to claim 6, characterized in that: The overboard discharge unit further comprises: The fresh water cooler cools the seawater supplied to the discharge seawater pump into cooling fresh water.

8. The greenhouse gas emission reduction device for a ship according to claim 7, characterized in that: The sediment discharged from the separator is supplied with seawater cooled by the clean water cooler and diluted to be discharged overboard.

9. The greenhouse gas emission reduction device for a ship according to claim 3, characterized in that: The overboard discharge unit includes a sensor for measuring one or more of the turbidity, pH and oil content of the sediment separated from the separator, and discharges the sediment to the overboard or temporarily stores the sediment according to whether an overboard discharge condition corresponding to the measurement value of the sensor is satisfied.

10. The greenhouse gas emission reduction device for a ship according to claim 3, 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.

11. 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.

12. The greenhouse gas emission reduction device for a ship according to claim 11, 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.

13. 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.

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 by circulating clean water supplied from an in-vessel cooling system through a heat exchange pipe surrounding the exhaust gas discharge pipe.

15. 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.

16. 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.

17. The greenhouse gas emission reduction device for a ship according to claim 16, characterized in that: The absorption liquid pump supplies the absorption liquid to the absorption liquid circulation tank to make up for the shortage of the absorption liquid discharged to the outside of the ship through the outside discharge part.

18. The greenhouse gas emission reduction device for a ship according to claim 16, characterized in that: The absorption liquid is generated by electrolyzing seawater and clean water respectively, and is stored in the absorption liquid storage tank.

19. 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 also includes SO X The absorption section serves as the exhaust gas cooling section, and the SO X The absorption unit cools the exhaust gas by reacting with the seawater supplied from the seawater supply unit, dissolving and removing SO X , The CO2 removal unit cools and removes SO X The exhaust gas reacts with the absorbent from the absorbent circulation supply unit to convert CO 2 into a carbonate aqueous solution, thereby capturing CO 2.

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 absorption tower also includes a NO absorption tower that absorbs and removes the exhaust 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 from the absorbent circulation supply unit.

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, Wherein, the exhaust gas cooling unit is arranged inside the absorption tower, Wherein, the absorption tower is stacked in sequence to form: NO X The absorption part absorbs and removes NO in the 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 be cooled, dissolving and removing SO X ;as well as The CO2 removal unit cools and removes SO X The exhaust gas reacts with the absorbent from the absorbent circulation supply unit to capture and remove CO2 by converting CO2 into a carbonate aqueous solution.

22. The greenhouse gas emission reduction device for a ship according to claim 20 or 21, characterized in that: The NO X The absorption section includes a selective catalyst reactor.

23. 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.

24. The greenhouse gas emission reduction device for a ship according to claim 23, characterized in that: The regeneration reactant includes a divalent metal oxide or a divalent metal hydroxide.

25. The greenhouse gas emission reduction device for a ship according to claim 1, characterized in that: The washing water treatment section 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.

26. 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 .

27. The greenhouse gas emission reduction device for a ship according to claim 26, characterized in that: include: The air supply unit supplies at least a portion of the branched exhaust gas to the exhaust gas cooling portion.

28. The greenhouse gas emission reduction device for a ship according to claim 27, characterized in that: The air supply unit is a blower.

29. The greenhouse gas emission reduction device for a ship according to claim 26, 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 joined to the main exhaust pipe after CO 2 is captured and discharged, or is discharged through a separate exhaust pipe.

30. A ship or marine structure equipped with the greenhouse gas emission reduction device for a ship according to any one of claims 1 to 21.

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