KR102403144B1 - Apparatus for reducing greenhouse gas emission in vessel cooperated with exhaust gas recirculation and vessel including the same - Google Patents

Abstract

The present invention is an exhaust gas receiver ₁₁₀ , a washing unit ( 120), a CO ₂ absorption unit 130 that absorbs and removes CO ₂ by injecting an absorption liquid into the exhaust gas that has passed through the cleaning unit 120, a combustion air receiver 140, and a high-concentration CO ₂ absorption liquid to absorb CO ₂ Absorbent solution production unit 150 supplied to unit 130, CO ₂ The aqueous solution of ammonium salt discharged from the absorption unit 130 is reacted with an aqueous divalent metal hydroxide solution to regenerate the absorption liquid and NH ₃ to the CO ₂ absorption unit 130. The absorption liquid regeneration unit 160 for recycling and reuse as an absorption liquid, and a portion of the ammonium salt aqueous solution and unreacted absorption liquid discharged from the CO ₂ absorption unit 130 are transferred to the CO ₂ absorption unit 130 through the absorption liquid circulation line (A). Including the absorption liquid circulation unit 170 for circulating, while maintaining the existing EGR and reducing the generation of NO _X , the original purpose of EGR, it can absorb and discharge CO ₂ as well as SO _X , or store it as a useful material, and the remaining unreacted Disclosed are an EGR-coupled greenhouse gas emission reduction device for a vessel capable of circulating an absorbent liquid, regenerating the absorbent liquid to be reused, and controlling the concentration of the absorbent liquid, and a vessel equipped with the same.

Description

A vessel equipped with an EGR-coupled greenhouse gas emission reduction device and a vessel equipped with the device

The present invention maintains the existing EGR and reduces the generation of NO _X , which is the original purpose of EGR, while absorbing CO ₂ , which is a representative greenhouse gas, as well as SO _X , and converts it into a material that does not affect the environment. to prevent engine corrosion and improve combustion quality, convert only a portion of the aqueous ammonium salt solution into carbonate, circulate the remaining unreacted absorbent liquid to maintain the CO ₂ absorption rate, regenerate the absorbent liquid to reuse it, and reduce the absorption performance of the absorbent liquid It relates to an EGR-coupled greenhouse gas emission reduction device for a ship, which controls the concentration of the absorbent liquid to prevent it, and a ship equipped with the device.

Recently, global warming and related environmental disasters have occurred due to the influence of greenhouse gas emissions caused by indiscriminate use of fossil fuels.

Accordingly, a series of technologies related to the capture and storage of carbon dioxide, a representative greenhouse gas, without emitting it is called CCS (Carbon dioxide Capture and Storage) technology and is receiving a lot of attention recently. Among CCS technologies, chemical absorption is It is the most commercialized technology among them in terms of large-scale processing possible.

_In addition, carbon dioxide emission regulation is regulated through IMO's EEDI, which aims to reduce more than 50% of 2008 emissions in 2050, and 40% of 2008 emissions must be reduced in 2030. , the technology to capture the emitted CO ₂ is attracting attention.

The above-mentioned technology for reducing carbon dioxide emission or capturing the generated carbon dioxide has not been commercialized in ships at present, and a method using hydrogen or ammonia as a fuel is currently being developed and has not reached the stage of commercialization. the current situation.

On the other hand, as a method of reducing NO _X in the exhaust gas exhausted from the marine engine, EGR (Exhaust Gas Recirculation) is applied, which recirculates the mixed gas to the intake system of the marine engine by mixing a part of the exhaust gas with compressed combustion air. have.

Accordingly, while maintaining EGR for ships operating or scheduled to be built using conventional fossil fuels, while reducing NO _X generation, which is the original purpose of EGR, it absorbs CO ₂ , a representative greenhouse gas, as well as SO _X , and does not affect the environment by absorbing SO X. There is a need to apply a technology that can be converted into a non-toxic material and discharged or stored as a useful material, control the concentration of the absorbent liquid to prevent deterioration of the absorption performance of the absorbent liquid, and regenerate the absorbent liquid.

Korean Patent Publication No. 2031210 (Ship exhaust gas reduction device and pollutant removal method, 20191011) Korean Patent Publication No. 1201426 (Greenhouse gas reduction device for ships, 20121114)

The technical task to be achieved by the idea of the present invention is to maintain the existing EGR and reduce the generation of NO _X , which is the original purpose of EGR, while absorbing CO ₂ as well as SO _X , which is a representative greenhouse gas, and converting it into a material that does not affect the environment. A vessel equipped with an EGR-coupled greenhouse gas emission reduction device and a vessel that can be discharged or stored as useful substances, control the concentration of the absorbent liquid to prevent deterioration of the absorption performance of the absorbent liquid, and regenerate and reuse the absorbent liquid is to provide

In order to achieve the above object, the present invention, the exhaust gas receiver to temporarily store the exhaust gas exhausted from each cylinder of the marine engine to remove the pulsation; a washing unit which sprays washing water into the exhaust gas from the exhaust gas receiver to remove SO _X and chute for washing, and circulates cooling water to cool the exhaust gas; a CO ₂ absorption unit for absorbing and removing CO ₂ by injecting an absorption liquid into the exhaust gas that has passed through the washing unit; a combustion air receiver for temporarily storing the exhaust gas that has passed through the CO ₂ absorber, removing the pulsation, and mixing it with combustion air to supply air to each cylinder of the marine engine; an absorption liquid preparation unit for preparing a high-concentration CO ₂ absorption liquid and supplying it to the CO ₂ absorption unit; an absorption liquid regenerating unit for regenerating the absorption liquid and NH ₃ by reacting the aqueous ammonium salt solution discharged from the CO ₂ absorption unit with an aqueous divalent metal hydroxide solution, circulating and supplying the absorption liquid and NH 3 to the CO ₂ absorption unit for reuse as an absorption liquid; and an absorption liquid circulation unit for circulating a portion of the ammonium salt aqueous solution and unreacted absorption liquid discharged from the CO ₂ absorption unit to the CO ₂ absorption unit through an absorption liquid circulation line;

In addition, the washing unit includes a washing water supply module that receives fresh water and neutralizes it to supply washing water, and the washing water from the washing water supply module is sprayed into the exhaust gas from the exhaust gas receiver to cool and clean. It may include a module, a cooling module for cooling the exhaust gas through cooling water, a washing water circulation module for circulating the washing water that has passed through the washing module, and a water treatment module for water treatment of the washing water.

In addition, the washing water supply module includes a washing water replenishment pump that receives fresh water and supplements the washing water and supplies it to the washing module, and a neutralizing agent supplying a neutralizing agent for adjusting pH to the washing water supplied to the washing module. a valve, wherein the cleaning module includes one or more cleaning units for cleaning by removing SO _X and chute by spraying cleaning water with exhaust gas, and the cooling module is formed at a lower end of the one or more cleaning units, and at least one cooling unit for cooling the exhaust gas to a predetermined temperature according to the type of the absorption liquid by circulating cooling water, wherein the washing water circulation module includes: a washing water circulation tank collecting the washing water that has passed through the washing module; a pH meter for measuring the pH of the washing water from the washing water circulation tank and adjusting the neutralizing agent supply valve to determine the input amount of the neutralizing agent; a buffer tank for storing the initial amount of washing water and replenishing the washing water; and a washing water circulation pump for circulating a part of washing water to the buffer tank and circulating a part of washing water to the washing module, wherein the water treatment module treats the washing water drained from the buffer tank to receive the water-treated washing water. A water treatment unit returning to the buffer tank, a sludge tank for storing sludge by the water treatment unit, an overboard discharge valve for discharging washing water satisfying a predetermined discharge condition by the water treatment unit overboard, and washing from the buffer tank It may include a washing water drain tank for temporarily storing water.

In addition, it may further include a washing water cooling unit installed at the rear end of the washing water circulation pump to cool the circulating washing water.

In addition, the CO ₂ absorption unit, one or more injection nozzles for spraying the absorption liquid supplied from the absorption liquid production unit or the absorption liquid regeneration unit, CO ₂ and the absorption liquid to contact the CO 2 by a chemical reaction to convert CO ₂ into a predetermined material. It may include one or more flow passages, and a cooling module for circulating cooling water through the one or more flow passages to cool the heat generated by the CO ₂ absorption reaction.

In addition, the one or more injection nozzles include an upper injection nozzle and a lower injection nozzle for downwardly spraying the absorption liquid, and the one or more flow passages contact CO ₂ with the absorption liquid to convert CO ₂ into a predetermined material by a chemical reaction. It includes an upper channel and a lower channel for converting, and the cooling module circulates cooling water in the upper channel and the lower channel section to cool the heat generated by the CO ₂ absorption reaction, and the CO ₂ absorber has a curved multi-plate shape. It may further include a mist catcher that is formed to remove moisture in the exhaust gas that has passed through the lower flow path, and an exhaust gas recirculation fan that increases the pressure of the exhaust gas from which moisture has been removed and recirculates it to the combustion air receiver.

In addition, the upper flow passage or the lower flow passage may be configured with a plurality of stages and partition walls to extend the contact time between the absorbent liquid and the exhaust gas to form a long flow passage.

In addition, in the upper flow path or the lower flow path, a distillation column packing designed to have a large contact area per unit volume to increase the contact time between the absorption liquid and the exhaust gas is formed in multiple stages, and a solution between the distillation column packing composed of multiple stages A redistributor may be formed.

In addition, in the upper channel and the lower channel, CO ₂ is absorbed by NH ₄ OH(aq), which is the absorption liquid, and converted into NH ₄ HCO ₃ (aq), and the cooling module is cooled in the upper channel and the lower channel. It is disposed in the form of a jacket or a cooling coil to remove the heat generated by the CO ₂ absorption reaction, thereby cooling the exhaust gas to 20°C to 50°C.

In addition, during Tier II mode operation, a reverse flow of combustion air to the exhaust gas recirculation fan is prevented through the valve at the outlet side of the exhaust gas recirculation fan, and the exhaust gas recirculates according to the pressure of the combustion air By adjusting the blowing pressure of the fan, the pressure of the exhaust gas from which moisture has been removed can be increased.

In addition, a turbine rotating by high-temperature and high-pressure exhaust gas supplied from the exhaust gas receiver, a compressor coupled to a rotating shaft of the turbine and rotating to compress combustion air and supply it to the combustion air receiver; an air intake filter for filtering foreign substances, a combustion air cooling module for cooling combustion air supplied from the compressor to the combustion air receiver, and a second agent for controlling the flow rate of exhaust gas from the exhaust gas receiver to the turbine The first control valve and the second control valve is formed at the rear end of the turbine to control the flow rate of the exhaust gas to the cleaning unit, it may further include a supercharger.

In addition, further comprising a third control valve for controlling a flow rate of exhaust gas from the exhaust gas receiver to the cleaning unit, due to a high load or high temperature exhaust gas, the exhaust coupled to the exhaust gas pipe connected to the turbine When damage to the gas use-related device is expected, the temperature of the exhaust gas may be lowered by controlling the opening and closing of the third control valve to increase the flow rate of the exhaust gas to the cleaning unit.

In addition, the combustion air cooling module includes at least one cooling jacket for cooling the combustion air by circulating cooling water, and a mist catcher formed in a curved multi-plate shape to remove moisture from the combustion air that has passed through the cooling jacket. can

In addition, the discharge discharged from the CO ₂ absorber may be stored in the sludge tank or discharged overboard.

In addition, the cleaning unit and the CO ₂ absorption unit may be configured to be mounted in an engine room or engine casing of the marine engine.

In addition, the absorbent liquid manufacturing unit, a fresh water tank for storing fresh water; a fresh water control valve for controlling the supply amount of fresh water from the fresh water tank; NH ₃ storage for storing high pressure NH ₃ ; an ammonia water tank for preparing and storing high-concentration ammonia water as an absorption liquid by injecting NH ₃ supplied from the NH ₃ storage to the fresh water supplied by the fresh water control valve; a pH sensor for measuring the ammonia water concentration in the ammonia water tank; and an ammonia water supply pump for supplying ammonia water from the ammonia water tank to the CO ₂ absorber through the absorption liquid circulation line.

In addition, it is possible to prevent evaporation loss of NH ₃ by injecting compressed air of a certain pressure into the ammonia water tank.

In addition, the absorption liquid regeneration unit, a storage tank for storing the divalent metal hydroxide aqueous solution; a mixing tank for generating NH ₃ (g) and carbonate by stirring the high-concentration aqueous ammonium salt solution and the divalent metal hydroxide aqueous solution discharged from the CO ₂ absorber with a stirrer; and a filter for separating carbonate by sucking the solution and precipitate from the mixing tank.

In addition, NH ₃ (g) regenerated by the mixing tank may be re-supplied to the CO ₂ absorption unit, or the absorption liquid separated by the filter may be supplied to the absorption liquid circulation unit.

In addition, the aqueous solution of divalent metal hydroxide stored in the storage tank may be Ca(OH) ₂ or Mg(OH) ₂ generated by reacting fresh water with CaO or MgO.

In addition, the ammonia water or fresh water separated by the filter is supplied to the absorption liquid circulation line, or the surplus fresh water additionally generated by the mixing tank compared to the total circulation fresh water is stored in the fresh water tank, and the divalent metal hydroxide aqueous solution in the storage tank It can be recycled when created.

In addition, the absorption liquid circulation unit includes an ammonia water circulation pump that circulates a part of the ammonium salt aqueous solution or unreacted absorption liquid through the absorption liquid circulation line, and a pH sensor for measuring the concentration of the absorption liquid supplied to the CO ₂ absorption unit through the absorption liquid circulation line. may include

On the other hand, in order to achieve the above object, the present invention can provide a ship equipped with an EGR-coupled greenhouse gas emission reduction device of the aforementioned ship.

According to the present invention, while maintaining the existing EGR and reducing NO _X generation, which is the original purpose of EGR, it absorbs CO ₂ , which is a representative greenhouse gas, as well as SO _X , converts it into a material that does not affect the environment, or converts it into a useful material. It can be treated separately after storage, and it removes SO _X and CO ₂ from the recirculated exhaust gas to prevent engine corrosion and improve combustion quality. It is possible to save space, so it is possible to secure free space, and it is possible to additionally install the existing EGR system on an already installed ship, so there is an effect that it can be configured to have fewer changes.

In addition, only a portion of the aqueous ammonium salt solution is converted to carbonate, and the remaining unreacted absorption liquid is circulated to maintain the CO ₂ absorption rate, the absorption liquid is regenerated and reused, and the concentration of the absorption liquid can be adjusted to prevent deterioration of the absorption performance of the absorption liquid. It works.

Furthermore, by taking only a portion of the absorption liquid and removing the absorbed CO ₂ , the size of the apparatus of the absorption liquid regeneration part and the absorption liquid circulation part is kept small, continuous operation is possible, and it is possible to flexibly cope with the CO ₂ absorption rate according to the load change of the ship engine. It is possible to prevent loss of absorbent liquid due to natural evaporation of high concentration absorbent liquid by applying a pressurization system, and it is possible to minimize consumption of relatively expensive NH ₃ by regenerating NH ₃ .

1 shows a schematic configuration diagram of an EGR-coupled greenhouse gas emission reduction device of a ship according to an embodiment of the present invention.
Figure 2 shows a system circuit diagram that implements the EGR-coupled greenhouse gas emission reduction device of the ship of Figure 1.
3 is a view showing the exhaust gas receiver and the supercharger separated in the system circuit diagram of FIG.
4 is an exploded view of the cleaning unit of the system circuit diagram of FIG. 2 .
5 is a diagram illustrating the separation of the CO ₂ absorption unit, the absorption liquid regeneration unit, and the absorption liquid circulation unit in the system circuit diagram of FIG. 2 .
FIG. 6 illustrates a configuration for adjusting the concentration of an absorbent liquid through an absorbent liquid circulation line of the system circuit diagram of FIG. 2 .
FIG. 7 is an exploded view of the absorbent liquid manufacturing unit of the system circuit diagram of FIG. 2 .

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

1, the EGR-coupled greenhouse gas emission reduction device of a ship according to an embodiment of the present invention is an exhaust gas receiver ( 110), a washing unit 120, which cools the exhaust gas by circulating the cooling water by spraying washing water with the exhaust gas from the exhaust gas receiver 110 to remove SO _X and chute. A CO ₂ absorption unit 130 that absorbs and removes CO ₂ by spraying the absorption liquid with the exhaust gas that has passed through, and the exhaust gas that has passed through the CO ₂ absorption unit 130 is temporarily stored to remove the pulsation and mixed with combustion air. to supply air to each cylinder of the marine engine 10, the combustion air receiver 140, the absorbent liquid production unit 150 that manufactures a high-concentration CO ₂ absorption liquid and supplies it to the CO ₂ absorption unit 130, the CO ₂ absorption unit 130 ) by reacting the aqueous solution of ammonium salt discharged with an aqueous solution of divalent metal hydroxide to regenerate the absorption liquid and NH ₃ and circulately supply it to the CO ₂ absorption unit 130 for reuse as an absorption liquid. Absorbent regeneration unit 160, and CO ₂ absorption unit Including an absorption liquid circulation unit 170 that circulates a part of the ammonium salt aqueous solution and unreacted absorption liquid discharged from 130 to the CO ₂ absorption unit 130 through the absorption liquid circulation line (A), the original EGR is maintained while maintaining the existing EGR. It can reduce the generation of _NOx , which is the objective, as well as CO2, _a representative greenhouse gas, and convert it into a substance that does not affect the environment _by absorbing it or storing it as a useful substance, thereby preventing engine corrosion and improving combustion quality. The gist is to convert only a portion of the aqueous ammonium salt solution into carbonate, circulate the remaining unreacted absorbent liquid to maintain the CO ₂ absorption rate, regenerate the absorbent liquid for reuse, and control the concentration of the absorbent liquid to prevent deterioration of the absorption performance of the absorbent liquid do it with

Hereinafter, with reference to FIGS. 1 to 7, the EGR-coupled greenhouse gas emission reduction device of the ship of the above configuration will be described in detail as follows.

First, the exhaust gas receiver 110, as shown in FIGS. 2 and 3, from the combustion chamber of each cylinder (not shown) composed of a plurality of the marine engine 10 by the exhaust stroke after combustion The high temperature and high pressure exhaust gas discharged from the exhaust gas outlet is temporarily stored to remove the pulsation of the exhaust gas, and is supplied to the cleaning unit 120 or the supercharger 180 at the rear stage through opening and closing of the control valve.

For example, since the ignition sequence for each cylinder is different, the discharge timing of the exhaust gas is also different and pulsation occurs. It is connected to the gas outlet and the other end is connected to the inlet side of the turbine 181 of the supercharger 180 or the inlet side of the washing module 122 of the washing unit 120 .

Next, the cleaning unit (EGR) 120 is a component that performs cleaning, cooling, and neutralization of exhaust gas, directly from the exhaust gas receiver 110 or branched from the rear end of the turbine 181 of the supercharger 180. The washing water is sequentially sprayed with the exhaust gas first or second to remove SO _X and soot contained in the exhaust gas for cleaning, and by circulating cooling water to cool the exhaust gas, the CO ₂ absorption unit 130 supplied with

For reference, in the combustion chamber, some of the oxygen contained in the combustion air is combusted with fuel to generate CO ₂ and the rest to generate NO _X and SO _X. The cleaning unit 120 is exhaust containing a large amount of CO ₂ after combustion. By cleaning and cooling the gas and supplying only the minimum oxygen required for combustion together with the combustion air from the supercharger 180 to the combustion chamber of the marine engine 10, the CO ₂ concentration of the combustion air itself is increased and the oxygen concentration is lowered to NO _X to inhibit the formation of

On the other hand, the reduction amount of NO _X also increases in proportion to the recirculation ratio of the exhaust gas, and about 30% to 40% of the total exhaust gas is recirculated and re-supplied to the marine engine 10 .

Specifically, as shown in FIGS. 2 and 4 , the washing unit 120 receives and neutralizes fresh water and supplies the washing water to the washing module 122 and the cooling module 123 . The supply module 121, the washing module 122 for cooling and cleaning by spraying the washing water from the washing water supply module 121 into the exhaust gas from the exhaust gas receiver 110, and cooling the exhaust gas through the cooling water A cooling module 123 that circulates and reuses the washing water that has passed through the washing module 122, and a water treatment module (WTS) 125 that treats the washing water. can be composed of

Here, the washing water supply module 121 adjusts the supply amount through the fresh water supply valve 121a to receive fresh water, supplement the washing water, and supply the washing water replenishment pump to the washing module 122 and the cooling module 123 . Sulfuric acid (H ₂ SO ₄ ) generated by SO _X contained in exhaust gas in the washing water supplied to the washing module 122 and the cooling module 123 from the 121b and the washing water supplement pump 121b is removed. and a neutralizing agent supply valve 121c for introducing a basic neutralizing agent for

In addition, the washing module 122 is configured to pre-spray the washing water supplied from the washing water supply module 121 or the washing water circulation module 124 into the exhaust gas, thereby discharging the high-temperature exhaust gas from 200°C to about 200°C. The first cleaning unit 122a at the front stage is cooled to 300° C. and cleaned by removing particle components such as SO _X and chute, and the exhaust gas cooled at the front end by secondary spraying the washing water into the exhaust gas (EGR cooler spray) It is composed of a second cleaning unit (122b) of the rear stage that cools to about 45 ℃ and removes SO _X and particle components such as chute for cleaning.

In addition, the cooling module 123 is formed at the lower end of the first cleaning unit 122a and by the circulating cooling water, the first cooling the exhaust gas to a predetermined temperature according to the type of absorption liquid used to absorb CO ₂ A second cooling unit that cools the exhaust gas to a predetermined temperature according to the type of absorption liquid used to absorb CO ₂ by the cooling water formed at the lower end of the cooling unit 123a and the second cleaning unit 122b and circulating. (123b).

In addition, the washing water circulation module 124 measures the pH of the washing water circulation tank 124a that collects the washing water that has passed through the washing module 122 and the washing water from the washing water circulation tank 124a to obtain a neutralizing agent. A pH meter 124b that controls the supply valve 121c to determine the input amount of the basic neutralizing agent, a buffer tank 124c that stores the initial amount of washing water and replenishes the washing water circulating to the washing module 122; It may be composed of a washing water circulation pump 124d that circulates part of the washing water to the buffer tank 124c and circulates a part of the washing water to the washing module 122 .

Here, the pH meter 124b measures the pH by sulfuric acid contained in the circulating washing water, and according to the measured pH, by adjusting the input amount of the basic neutralizing agent, for example, NaOH, by the neutralizing agent supply valve 121c to supply the washing water. Neutralizes to prevent corrosion of pipelines and related components through which the washing water circulates, and the buffer tank 124c collects and removes excess moisture incidentally generated by combustion of exhaust gas, and is water treated by the water treatment module 125 It can also be replenished by storing purified washing water.

On the other hand, the washing water circulation module 124 further includes a washing water cooling unit 124e installed at the rear end of the washing water circulation pump 124d to cool the circulating washing water, so that the temperature rises after washing the exhaust gas. The water may be cooled and supplied to the cleaning module 122 . For example, the temperature of the exhaust gas passing through the cleaning module 122 is preferably about 20 to 50 °C.

In addition, the water treatment module 125 includes a water treatment unit 125a that water-treats the washing water drained from the buffer tank 124c by centrifugation or filtering, and returns the treated washing water to the buffer tank 124c, and water treatment. A sludge tank 125b for storing sludge discharged by the unit 125a, and an outboard discharge valve 125c for discharging washing water that meets a predetermined overboard discharge condition by the water treatment unit 125a overboard; It is composed of a washing water drain tank 125d for temporarily storing the washing water from the buffer tank 124c, so that residues such as chute included in the washing water are separated and stored, and the separated discharged water is discharged overboard.

Next, the CO ₂ absorption unit 130 passes through the cleaning unit 120 to remove SO _X and sprays the absorption liquid supplied from the absorption liquid production unit 150 with the cooled exhaust gas to absorb and remove CO ₂ .

Specifically, as shown in FIGS. 2 and 5 , the CO ₂ absorbing unit 130 includes the upper injection nozzle 131 for downwardly injecting the absorption liquid, and the CO ₂ and the absorption liquid are physically brought into contact with the CO by a chemical reaction. ₂ to NH ₄ HCO ₃ The upper flow passage 132, the lower injection nozzle 133 for spraying the absorption liquid downward, CO ₂ and the absorption liquid are physically brought into contact with CO ₂ by a chemical reaction to NH ₄ HCO ₃ Formed in the form of a lower flow path 134 for converting, a cooling module 135 for cooling heat generated by CO ₂ absorption reaction by circulating cooling water through the sections of the upper flow path 132 and the lower flow path 134, respectively, and a curved multi-plate shape A mist catcher 136 that removes moisture from the exhaust gas that has passed through the lower flow path 134, and an exhaust gas recirculation fan 137 that increases the pressure of the exhaust gas from which moisture has been removed and recirculates it to the combustion air receiver 140. is composed

Here, the upper injection nozzle 131 and the lower injection nozzle 133 may be configured in a form in which a plurality of auxiliary pipes having a plurality of injection holes are installed in communication with the main pipe.

On the other hand, the upper flow path 132 or the lower flow path 134 is composed of a plurality of stages and partition walls to increase the contact time between the absorption liquid and the exhaust gas to form a long flow path, thereby sufficiently absorbing and dissolving CO ₂ by the absorption liquid or Make sure to convert it to a material that meets the requirements for overboard discharge.

In addition, in the upper passage 132 or the lower passage 134, distilling column packing designed to have a large contact area per unit volume so as to increase the contact time between the absorbent liquid and the exhaust gas is composed of multi-stage fillers 132a and 134a. ) and a solution redistributor (not shown) may be formed between the distillation column packing composed of multiple stages.

For example, it is possible to select an appropriate distillation column packing for the process in consideration of the contact area per unit area, the pressure drop of the gas, and the overflow rate, and to prevent the channeling of fresh water by the solution redistributor.

On the other hand, depending on the selection of the absorption liquid for absorbing CO ₂ , the product and the cooling method may be different, that is, when using the high concentration NH ₄ OH (aq) prepared by the absorption liquid preparation unit 150 as the absorption liquid, NH ₄ OH(aq) passing through the upper channel 132 and the lower channel 134 absorbs CO ₂ by the following [Formula 1] or [Formula 2] and converts it to NH ₄ HCO ₃ (aq), The cooling module 135 is disposed in the form of a cooling jacket or a cooling coil in the upper passage 132 and the lower passage 134 to remove heat due to the CO ₂ absorption reaction to reduce the exhaust gas to 20°C. By cooling to 50 ℃, it is possible to induce a smooth forward reaction of [Formula 1] or [Formula 2].

That is, when it is less than 20 ℃, the CO ₂ absorption rate decreases, and when it exceeds 50 ℃, the CO ₂ absorption rate may increase, but NH ₃ has a disadvantage in that it is vaporized and disappears, maintaining it at 20 ℃ to 50 ℃ it may be desirable

On the other hand, in ECA (Emission Control Area), Tier III is applied as the NO _X emission standard to drive EGR to reduce NO _X in exhaust gas below the NO _X emission standard, but EGR driving is not essential. During Tier II mode operation applied on the high seas, through the valve 138 on the outlet side of the exhaust gas recirculation fan 137, the reverse flow of combustion air to the exhaust gas recirculation fan 137 is prevented, and combustion The pressure of the exhaust gas from which moisture has been removed may be increased by adjusting the blowing pressure of the exhaust gas recirculation fan 137 according to the pressure of the air using a variable frequency driver (VFD).

In addition, a high concentration of NH ₄ HCO ₃ (aq) among the absorbent liquid drained through the upper flow path 132 and the lower flow passage 134 is supplied to the absorbent solution regeneration unit 160 to NH ₄ OH(aq) and NH ₃ (g) is regenerated, and unreacted NH ₄ OH(aq) is supplied to the CO ₂ absorption unit 130 through the absorption liquid circulation line (A) and may be stored in the sludge tank 125b by adjusting the valve to be reused.

Next, the combustion air receiver (scavenge air receiver) 140, as shown in FIG. 3, passes through the CO2 absorber 130 to remove the CO ₂ and temporarily stores the exhaust gas with the oxygen concentration lowered to remove the pulsation. And, it is mixed with combustion air in the intake stroke and supplied to each cylinder of the marine engine (10).

For example, since the ignition sequence for each cylinder is different, the intake time of combustion air is also different and pulsation occurs. One side is connected to the combustion air intake of the combustion chamber and the other side is connected to the CO ₂ absorber 130 or the compressor 182 outlet side of the supercharger 180 or the combustion air cooling module 184.

Next, the absorption liquid preparation unit 150 prepares a high-concentration CO ₂ absorption liquid and initially supplies it to the CO ₂ absorption unit 130 or supplements the high-concentration absorption liquid when the concentration of the absorption liquid circulating through the absorption liquid circulation line A decreases. to maintain the set absorption performance.

That is, the absorption liquid preparation unit 150 reacts fresh water with NH ₃ as shown in the following [Formula 3] to supply a high-concentration absorption liquid to maintain the concentration of the absorption liquid, and thus, a high-concentration ammonia water (NH ₄ OH(aq) as a CO ₂ absorption liquid) ) is manufactured and supplied to the CO ₂ absorption unit 130 through the absorption liquid circulation unit 170 .

Specifically, as shown in FIG. 7, the absorption liquid manufacturing unit 150 includes a fresh water tank (not shown) for storing fresh water, a fresh water control valve 151 for supplying fresh water from the fresh water tank to the ammonia water tank 153, _{Ammonia water tank (} 153), a pH sensor 154 for measuring the concentration of ammonia water in the ammonia water tank 153, and an ammonia water supply pump for supplying ammonia water from the ammonia water tank 153 to the CO ₂ absorption unit 130 through the absorption liquid circulation line (A) (155).

Here, the concentration of ammonia water circulating through the CO ₂ absorption unit 130 and the absorption liquid regenerating unit 160 along the absorption liquid circulation line (A) is decreased while the operation is repeated. The unit 150 may supply high-concentration ammonia water to the absorption liquid circulation line A of the absorption liquid circulation unit 170 to compensate for the lowered ammonia water concentration and keep it constant at the designed ammonia water concentration.

On the other hand, high-concentration ammonia water has a higher partial pressure of NH ₃ (g) compared to low-concentration ammonia water at the same temperature, so that NH ₃ evaporates more easily at atmospheric pressure, resulting in an increase in loss. Therefore, in order to store high concentration ammonia water, the temperature should be lowered so that the solubility is high and the vapor pressure of NH ₃ (g) is lowered, and it should be operated under a pressurized system.

For example, in order to prevent NH ₃ (g) from being evaporated and lost to the atmosphere, compressed air of a certain pressure is injected into the ammonia water tank 153 to maintain the pressure in the ammonia water tank 153 in a high state to evaporate NH ₃ loss can be effectively prevented.

For example, since NH3 can be stored in a liquid state at -34°C and 8.5 bar, the inside of the ammonia water tank 153 is maintained at a constant pressure using 7 bar compressed air available in the ship, and the ammonia water with a concentration of 50% is converted into ammonia water. It may be stored in the tank 153 .

In addition, a safety valve 156 for preventing overpressure of the ammonia water tank 153 may be installed.

Next, the absorption liquid regeneration unit 160 reacts the aqueous solution of ammonium salt discharged from the CO ₂ absorption unit 130 with an aqueous solution of divalent metal hydroxide to regenerate the absorption liquid and NH ₃ , and circulates and supplies it to the CO ₂ absorption unit 130 as an absorption liquid. to be reused.

That is, the absorption liquid regenerating unit 160 regenerates NH ₃ from the ammonium salt aqueous solution and returns it to the CO ₂ absorption unit 130 to reuse it as a CO ₂ absorption liquid, and CO ₂ in the form of CaCO ₃ (s) or MgCO ₃ (s). It can be stored as or discharged overboard.

Specifically, as shown in FIG. 5 , the absorption liquid regenerating unit 160 includes a storage tank 161 for storing an aqueous divalent metal hydroxide solution, an aqueous ammonium salt solution drained from the CO ₂ absorption unit 130 and a divalent metal hydroxide solution. _A filter ( 163) can be configured.

In addition, the aqueous solution of divalent metal hydroxide stored in the storage tank 161 may be Ca(OH) ₂ or Mg(OH) ₂ generated by reacting fresh water with CaO or MgO.

In addition, when the concentration of the ammonia water circulating in the absorption liquid circulation line (A) is low, the generation of (NH ₄ ) ₂ CO ₃ of the previous [Formula 2] is reduced to increase the CO ₂ emission, and when the concentration is high, excessive CO ₂ Because carbonate production increases more than necessary due to absorption, the concentration of ammonia water must be kept constant so that the CO ₂ absorption performance of the CO ₂ absorption unit 130 can be continued. In order to implement this, it may be designed to adjust the concentration of ammonia water to 12% by mass, but is not limited thereto and may be changed according to the conditions of use.

In addition, the carbonate (CaCO ₃ (s), MgCO ₃ (s)) separated by the filter 163 is transferred to a slurry state, or a dryer (not shown) to be transferred to a solid state, and stored separately It may be provided with a storage tank (not shown) of the or may be discharged overboard without storage. Here, as an example of the filter 163, a membrane filter suitable for sediment separation by high-pressure fluid transfer may be applied.

On the other hand, the ammonia water or fresh water separated by the filter 163 is supplied to the absorption liquid circulation unit 170, or the surplus fresh water additionally generated by the mixing tank 162 compared to the total circulation fresh water is stored in a fresh water tank (not shown). When the divalent metal hydroxide aqueous solution is generated in the storage tank 161, fresh water can be saved by recycling it.

Through this, only relatively inexpensive metal oxide (CaO or MgO) or divalent metal hydroxide aqueous solution (Ca(OH) ₂ or Mg(OH) ₂ ) is added, so that additional input of water is not required, there is no decrease in the concentration of ammonia water, and the filter ( 163), it is possible to reduce the capacity size, and it is possible to reduce the cost of NH ₃ regeneration. That is, in theory, only metal oxide is consumed, and NH ₃ and fresh water are reused, thereby significantly reducing the cost of CO ₂ removal.

In addition, as mentioned above, NH ₃ (g) generated in the mixing tank 162 may be supplied to the CO ₂ absorption unit 130 to be reused.

Next, the absorption liquid circulation unit 170 circulates the ammonium salt aqueous solution and a portion of the unreacted absorption liquid discharged from the CO ₂ absorption unit 130 to the CO ₂ absorption unit 130 through the absorption liquid circulation line (A).

Specifically, the absorption liquid circulation unit 170 is a centrifugal pump type ammonia water circulation pump that circulates the ammonium salt aqueous solution and a part of the unreacted absorption liquid through the absorption liquid circulation line (A), as shown in FIGS. 1, 5 and 6 . 171 , and a pH sensor 172 for measuring the concentration of the absorption liquid supplied to the upper end of the CO ₂ absorption unit 130 .

Here, when the concentration of HCO ₃ ⁻ in the absorption liquid is high, the amount of CO ₂ absorption decreases and CO ₂ emission increases, and when the concentration of HCO ₃ ⁻ is low, the carbonate production increases more than necessary due to excessive CO ₂ absorption, pH By continuously monitoring the concentration of the absorbent liquid through the sensor 172 , the concentration of HCO ₃ ^- or OH ^- of the absorbent liquid, that is, the pH can be maintained at an appropriate level.

Through this, a portion of the ammonium salt aqueous solution flowing through the absorption liquid circulation line (A) is transferred to the mixing tank 162 of the absorption liquid regeneration unit 160, converted into carbonate, and only a portion of CO ₂ is removed and regenerated by the filter 163 By supplying the ammonia water to the absorption liquid circulation line (A), the absorption liquid having a high OH ₋ concentration and a low HCO ₃ ⁻ concentration may be supplied to maintain the CO ₂ absorption rate.

Accordingly, by taking only a part of the absorbent liquid used for collecting CO ₂ and removing the absorbed CO ₂ , the size of the apparatus of the absorbent regeneration unit 160 and the absorbent liquid circulation unit 170 is kept small and continuous operation is possible, and the marine engine It is possible to flexibly cope with the CO ₂ absorption rate according to the load change in (10).

Next, as shown in FIG. 3 , the turbocharger 180 includes a turbine 181 rotating by high-temperature and high-pressure exhaust gas supplied from the exhaust gas receiver 110 , and a rotation shaft of the turbine 181 . A compressor 182 that is coupled to and rotates to compress combustion air and supply it to the combustion air receiver 140, an air intake filter 183 formed on the inlet side of the compressor 182 to filter foreign substances, and a compressor 182 ) a combustion air cooling module 184 for cooling the combustion air supplied to the combustion air receiver 140, and a first regulating valve ( 185) and a second control valve 186 formed at the rear end 181 of the turbine to control the flow rate of exhaust gas to the cleaning unit 120, and compressing combustion air using high-temperature and high-pressure energy of the exhaust gas to increase engine efficiency.

On the other hand, by further comprising a third control valve 187 for controlling the flow rate of exhaust gas from the exhaust gas receiver 110 to the cleaning unit 120, due to a high load or high temperature exhaust gas, the turbine 181 When damage to the exhaust gas use related device coupled to the exhaust gas pipe (A) connected to the outlet side, for example, the steam generator is expected, the cleaning unit 120 controls the opening and closing of the third control valve 187 It is also possible to lower the temperature of the exhaust gas by increasing the flow rate of the exhaust gas to the furnace.

In addition, the combustion air cooling module 184 is formed in the form of a one- or two-stage cooling jacket 184a for cooling combustion air by circulating cooling water, and a curved multi-plate shape, and combustion air passing through the cooling jacket 184a. It is composed of a mist catcher (184b) that removes the moisture of the compressor (182) by lowering the temperature rise due to compression of the combustion air to increase the efficiency of the supercharger and increase the air density to improve the efficiency of the marine engine (10).

On the other hand, the washing unit 120 and the CO ₂ absorption unit 130 are configured to be mounted in the engine room or the engine casing of the marine engine 10, thereby saving installation space, and the existing EGR system is installed in advance. It can be configured so that there are few changes by enabling additional installation on the ship.

On the other hand, the ship according to another embodiment of the present invention, it is possible to provide a ship equipped with the above-mentioned EGR-coupled greenhouse gas emission reduction device.

Therefore, by the configuration of the ship's EGR-coupled greenhouse gas emission reduction device as described above, while maintaining the existing EGR and reducing the generation of NO _X , which is the original purpose of EGR, it absorbs CO ₂ as well as SO _X , which is a representative greenhouse gas, to the environment. It can be converted into a substance that does not affect the exhaust or stored as _a useful substance to prevent engine _corrosion and improve combustion quality. It is possible to improve the quality and to be installed in the engine room of a ship engine or inside the engine casing to save installation space, thereby securing free space, and enabling additional installation on ships where the existing EGR system is already installed. It can be configured to have few changes.

In addition, only a part of the aqueous ammonium salt solution is converted into carbonate, and the remaining unreacted absorption liquid is circulated to maintain the CO ₂ absorption rate, the absorption liquid is regenerated and reused, and the concentration of the absorption liquid can be adjusted to prevent deterioration of the absorption performance of the absorption liquid. , by taking only a part of the absorbent and removing the absorbed CO ₂ , the size of the absorbent regeneration part and the absorbent circulation part is kept small, continuous operation is possible, and the CO ₂ absorption rate according to the load change of the ship engine can be flexibly dealt with. In addition, by applying a pressurization system, absorption liquid loss due to natural evaporation of high concentration absorption liquid is prevented, and consumption of relatively expensive NH ₃ can be minimized by regenerating NH ₃ .

110: exhaust gas receiver 120: cleaning unit
121: washing water supply module 122: washing module
123: cooling module 124: washing water circulation module
125: water treatment module 130: CO ₂ absorption part
131: upper injection nozzle 132: upper flow path
133: lower injection nozzle 134: lower flow path
135: cooling module 136: mist catcher
137: exhaust gas recirculation fan 138: valve
140: combustion air receiver 150: absorption liquid production unit
151: fresh water control valve 152: NH ₃ storage
153: ammonia water tank 154: pH sensor
155: ammonia water supply pump 156: safety valve
160: absorption liquid regeneration unit 161: storage tank
162: mixing tank 163: filter
170: absorption liquid circulation unit 171: ammonia water circulation pump
172: pH sensor 180: supercharger
181: turbine 182: compressor
183: air intake filter 184: combustion air cooling module
185: first control valve 186: second control valve
187: third control valve

Claims (23)

an exhaust gas receiver for temporarily storing exhaust gas exhausted from each cylinder of the marine engine to remove pulsation;
a washing unit which sprays washing water into the exhaust gas from the exhaust gas receiver to remove SO _X and chute for washing, and circulates cooling water to cool the exhaust gas;
a CO ₂ absorption unit for absorbing and removing CO ₂ by injecting an absorption liquid into the exhaust gas that has passed through the washing unit;
a combustion air receiver for temporarily storing the exhaust gas that has passed through the CO ₂ absorber, removing the pulsation, and mixing it with combustion air to supply air to each cylinder of the marine engine;
an absorption liquid preparation unit for preparing a high-concentration CO ₂ absorption liquid and supplying it to the CO ₂ absorption unit;
an absorption liquid regenerating unit for regenerating the absorption liquid and NH ₃ by reacting the aqueous ammonium salt solution discharged from the CO ₂ absorption unit with an aqueous divalent metal hydroxide solution, circulating and supplying the absorption liquid and NH 3 to the CO ₂ absorption unit for reuse as an absorption liquid; and
An absorption liquid circulation unit circulating a portion of the ammonium salt aqueous solution and unreacted absorption liquid discharged from the CO ₂ absorption unit to the CO ₂ absorption unit through an absorption liquid circulation line; Containing, EGR-coupled greenhouse gas emission reduction device for ships. The method of claim 1,
The cleaning unit,
A washing water supply module that receives fresh water and neutralizes it to supply washing water; a washing module that cools and cleans by spraying the washing water from the washing water supply module into the exhaust gas from the exhaust gas receiver; A cooling module for cooling gas, a washing water circulation module for circulating the washing water that has passed through the washing module, and a water treatment module for water treatment of the washing water, an EGR-coupled greenhouse gas emission reduction device for a ship. 3. The method of claim 2,
The washing water supply module includes a washing water replenishment pump that receives fresh water and replenishes the washing water and supplies it to the washing module, and a neutralizing agent supply valve that injects a neutralizing agent for adjusting pH to the washing water supplied to the washing module. including,
The cleaning module includes one or more cleaning units for cleaning by spraying cleaning water with exhaust gas to remove SO _X and chute,
The cooling module includes one or more cooling units formed at the lower end of the one or more cleaning units and cooling the exhaust gas to a predetermined temperature according to the type of the absorption liquid by the circulating cooling water,
The washing water circulation module includes: a washing water circulation tank collecting the washing water that has passed through the washing module; a pH meter to determine the pH; ,
The water treatment module includes: a water treatment unit that water-treats the washing water drained from the buffer tank and returns the water-treated washing water to the buffer tank; a sludge tank that stores sludge from the water treatment unit; An EGR-coupled greenhouse gas emission reduction device for a ship, comprising: an overboard discharge valve for discharging the washing water satisfying the discharge condition to the outboard; and a washing water drain tank for temporarily storing the washing water from the buffer tank. 4. The method of claim 3,
EGR-coupled greenhouse gas emission reduction device of a ship, characterized in that it further comprises a washing water cooling unit installed at the rear end of the washing water circulation pump to cool the circulating washing water. The method of claim 1,
The CO ₂ absorption unit,
One or more injection nozzles for spraying the absorbent liquid supplied from the absorbent liquid manufacturing unit or the absorbent liquid regenerating unit, one or more flow passages for converting CO ₂ into a predetermined material by a chemical reaction by contacting CO ₂ with the absorbent liquid, and the one or more EGR-coupled greenhouse gas emission reduction device of a ship, characterized in that it includes a cooling module for cooling the heat generated by the CO ₂ absorption reaction by circulating the cooling water through the flow path. 6. The method of claim 5,
The one or more injection nozzles include an upper injection nozzle and a lower injection nozzle for downwardly spraying the absorption liquid,
The at least one flow path includes an upper flow path and a lower flow path for converting CO ₂ into a predetermined material by a chemical reaction by contacting CO ₂ with the absorption liquid,
The cooling module circulates cooling water to the upper passage and the lower passage section to cool the heat generated by the CO ₂ absorption reaction,
The CO ₂ absorption unit is formed in a curved multi-plate shape and includes a mist catcher for removing moisture from the exhaust gas that has passed through the lower flow path, and exhaust gas recirculation for recirculating the exhaust gas to the combustion air receiver by increasing the pressure of the exhaust gas from which moisture has been removed. EGR-coupled greenhouse gas emission reduction device of the ship, characterized in that it further comprises a fan. 7. The method of claim 6,
The upper flow passage or the lower flow passage, characterized in that it is composed of a plurality of stages and bulkheads so as to increase the contact time of the absorption liquid and the exhaust gas to form a long passage, EGR-coupled greenhouse gas emission reduction device for ships. 7. The method of claim 6,
In the upper flow path or the lower flow path, a distillation column packing designed to have a large contact area per unit volume to increase the contact time between the absorbent liquid and the exhaust gas is formed in multiple stages, and a solution redistributor is provided between the distillation column packing composed of multiple stages. A device for reducing EGR-coupled greenhouse gas emissions of a ship, characterized in that it is formed. 7. The method of claim 6,
Absorbing CO ₂ by NH ₄ OH(aq), which is the absorption liquid, in the upper flow path and the bottom flow path, and converting it into NH ₄ HCO ₃ (aq),
The cooling module is disposed in the form of a cooling jacket or a cooling coil in the upper passage and the lower passage to remove heat due to the CO ₂ absorption reaction to cool the exhaust gas to 20°C to 50°C, EGR of a ship Combined greenhouse gas emission reduction device. 7. The method of claim 6,
During Tier II mode operation, through the valve on the outlet side of the exhaust gas recirculation fan, the reverse flow of combustion air to the exhaust gas recirculation fan is prevented,
An EGR-coupled greenhouse gas emission reduction device for a ship, characterized in that it increases the pressure of the exhaust gas from which moisture has been removed by adjusting the blowing pressure of the exhaust gas recirculation fan according to the pressure of the combustion air. The method of claim 1,
A turbine rotating by the high-temperature and high-pressure exhaust gas supplied from the exhaust gas receiver, a compressor coupled to a rotating shaft of the turbine and rotating to compress combustion air and supply it to the combustion air receiver; an air intake filter for filtering foreign substances, a combustion air cooling module for cooling the combustion air supplied from the compressor to the combustion air receiver, and a first control for controlling the flow rate of exhaust gas from the exhaust gas receiver to the turbine A valve and a second control valve formed at the rear end of the turbine to control the flow rate of exhaust gas to the washing unit, characterized in that it further comprises a turbocharger, EGR-coupled greenhouse gas emission reduction device of the ship. 12. The method of claim 11,
Further comprising a third control valve for controlling the flow rate of the exhaust gas from the exhaust gas receiver to the cleaning unit,
When damage to the exhaust gas use related device coupled to the exhaust gas pipe connected to the turbine is expected due to a high load or high temperature exhaust gas, the third control valve is opened and closed to control the exhaust gas to the cleaning unit EGR-coupled greenhouse gas emission reduction device of a ship, characterized in that to lower the temperature of the exhaust gas by increasing the flow rate of gas. 12. The method of claim 11,
The combustion air cooling module comprises at least one cooling jacket for cooling the combustion air by circulating cooling water, and a mist catcher formed in a curved multi-plate shape to remove moisture from the combustion air that has passed through the cooling jacket. EGR-coupled greenhouse gas emission reduction device for ships. 4. The method of claim 3,
EGR-coupled greenhouse gas emission reduction device of the ship, characterized in that the discharge discharged from the CO ₂ absorption unit is stored in the sludge tank or discharged overboard. The method of claim 1,
The washing unit and the CO ₂ absorption unit EGR-coupled greenhouse gas emission reduction device of the ship, characterized in that it is configured in a form mounted inside the engine room or engine casing of the ship engine. The method of claim 1,
The absorbent liquid production unit,
Fresh water tank for storing fresh water;
a fresh water control valve for controlling the supply amount of fresh water from the fresh water tank;
NH ₃ storage for storing high pressure NH ₃ ;
an ammonia water tank for preparing and storing high-concentration ammonia water as an absorption liquid by injecting NH ₃ supplied from the NH ₃ storage to the fresh water supplied by the fresh water control valve;
a pH sensor for measuring the ammonia water concentration in the ammonia water tank; and
An ammonia water supply pump for supplying ammonia water from the ammonia water tank to the CO ₂ absorption part through the absorption liquid circulation line; 17. The method of claim 16,
EGR-coupled greenhouse gas emission reduction device of a ship, characterized in that by injecting compressed air of a certain pressure into the ammonia water tank to prevent evaporative loss of NH ₃ . The method of claim 1,
The absorbent liquid regeneration unit,
a storage tank for storing an aqueous solution of divalent metal hydroxide;
a mixing tank for generating NH ₃ (g) and carbonate by stirring the high-concentration aqueous ammonium salt solution and the divalent metal hydroxide aqueous solution discharged from the CO ₂ absorber with a stirrer; and
A filter for separating carbonate by sucking the solution and sediment from the mixing tank; characterized in that it comprises a, EGR-coupled greenhouse gas emission reduction device of a ship. 19. The method of claim 18,
NH ₃ (g) regenerated by the mixing tank is re-supplied to the CO ₂ absorption unit, or the absorption liquid separated by the filter is supplied to the absorption liquid circulation unit, EGR-coupled greenhouse gas emission reduction device of a ship . 19. The method of claim 18,
The divalent metal hydroxide aqueous solution stored in the storage tank is Ca(OH) ₂ or Mg(OH) ₂ generated by reacting fresh water with CaO or MgO, EGR-coupled greenhouse gas emission reduction device of a ship, characterized in that. 19. The method of claim 18,
When the ammonia water or fresh water separated by the filter is supplied to the absorption liquid circulation line, or the surplus fresh water additionally generated by the mixing tank compared to the total circulation fresh water is stored in the fresh water tank to generate a divalent metal hydroxide aqueous solution in the storage tank Characterized in recycling, the EGR-coupled greenhouse gas emission reduction device of the ship. The method of claim 1,
The absorption liquid circulation unit includes an ammonia water circulation pump for circulating a portion of the ammonium salt aqueous solution or unreacted absorption liquid through the absorption liquid circulation line, and a pH sensor for measuring the concentration of the absorption liquid supplied to the CO ₂ absorption unit through the absorption liquid circulation line Characterized in that, the EGR-coupled greenhouse gas emission reduction device of the ship. 23. A ship equipped with an EGR-coupled greenhouse gas emission reduction device according to any one of claims 1 to 22.

Images