Egr combining greenhouse gas reduction device for ship and ship equipped with the same

Abstract

Disclosed is an EGR combined greenhouse gas reduction device for a ship, including: an exhaust gas receiver 110 temporarily storing exhaust gas discharged after combustion of each cylinder of a ship engine 10 and removing pulsation; a washing section 120 spraying washing water to the exhaust gas from the exhaust gas receiver 110, washing and removing SO X x, and soot, circulating coolant to cool the exhaust gas; a CO2 absorbing section 130 spraying absorbing liquid to the exhaust gas passing through the washing section 120 to absorb and remove CO2; and a combustion air receiver 140 temporarily storing the exhaust gas passing through the CO2 absorbing section, removing pulsation, mixing with combustion air, and supplying the air to each cylinder of the ship engine 10. The device can reduce NO X x, which is the original purpose of EGR, while maintaining the original EGR, and not only absorb CO2, which is a representative greenhouse gas, but also absorb SO X x, which can be converted into a substance that does not affect the environment and discharged, or stored as a useful substance, can prevent corrosion of the engine, and improve combustion quality.

Description

Technical Field

[0001] This invention relates to a ship's EGR combined with greenhouse gas emission reduction device and a ship equipped with the device, which can reduce NO, the original purpose of EGR, while maintaining the original EGR. X It generates and absorbs not only CO2, a representative greenhouse gas, but also SO2. X It can be converted into substances that do not harm the environment and discharged, or stored as useful substances, which can prevent engine corrosion and improve combustion quality. Background Technology

[0002] Recently, global warming and related environmental disasters are occurring due to greenhouse gas emissions from the indiscriminate use of fossil fuels.

[0003] Therefore, a series of technologies related to capturing and storing carbon dioxide, a typical greenhouse gas, without releasing it, are known as carbon dioxide capture and storage (CCS) technologies, which have recently attracted much attention. Among CCS technologies, chemical absorption is the most commercially available due to its ability to process on a large scale.

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

[0005] The technologies mentioned above for reducing carbon dioxide emissions or capturing generated carbon dioxide have not yet been commercialized in ships, and methods for using hydrogen or ammonia as fuel are also under development and have not yet reached the stage of commercialization.

[0006] On the other hand, as a way to reduce NO emissions from ship engines... X The method being applied is to mix a portion of the exhaust gas with compressed combustion air and recirculate the mixture back into the intake system of the ship's engine (EGR: Exhaust Gas Recirculation).

[0007] Therefore, a technology is needed to reduce NOx, which is the original purpose of EGR, for ships that have historically used fossil fuels for navigation or are currently under construction, while maintaining EGR. X It generates and absorbs not only CO2, a typical greenhouse gas, but also SO2. XIt can be converted into substances that do not harm the environment and discharged, or stored as useful substances. Summary of the Invention

[0008] Technical issues

[0009] The technical problem this invention aims to solve is to provide a ship's EGR combined with a greenhouse gas emission reduction device and a ship equipped with such a device, which can reduce NO, the original purpose of EGR, while maintaining the original EGR. X It generates and absorbs not only CO2, a representative greenhouse gas, but also SO2. X It can be converted into substances that do not harm the environment and discharged, or stored as useful substances, which can prevent engine corrosion and improve combustion quality.

[0010] Technical solution

[0011] To achieve the aforementioned objectives, the present invention provides a marine EGR combined with greenhouse gas emission reduction device, comprising: an exhaust gas receiver that temporarily stores exhaust gas discharged from each cylinder of a marine engine and removes pulsations; and a cleaning unit that sprays cleaning water onto the exhaust gas from the exhaust gas receiver to remove SO2. X The system includes a cleaning section for removing carbon soot, a cooling liquid circulation section for cooling exhaust gases, a CO2 absorption section for absorbing and removing CO2 from exhaust gases passing through the cleaning section, and a combustion air receiver for temporarily storing exhaust gases passing through the CO2 absorption section, removing pulsations, mixing them with combustion air, and supplying air to the cylinders of the ship engine.

[0012] Additionally, the cleaning unit may include: a cleaning water supply module, which receives clean water for neutralization and supplies cleaning water; a cleaning module, which sprays the cleaning water from the cleaning water supply module onto the exhaust gas from the exhaust gas receiver for cooling and cleaning; a cooling module, which cools the exhaust gas with a coolant; a cleaning water circulation module, which circulates the cleaning water passing through the cleaning module; and a water treatment module, which treats the cleaning water.

[0013] Additionally, the cleaning water supply module may include: a cleaning water replenishment pump, which receives clean water to replenish the cleaning water supply and supplies it to the cleaning module; and a neutralizing agent supply valve, which adds a neutralizing agent for pH adjustment to the cleaning water supplied from the cleaning water replenishment pump to the cleaning module; the cleaning module may include one or more cleaning units, which spray cleaning water to remove SO₂. Xand soot; the cooling module can include one or more cooling units formed at lower ends of the one or more washing units, which cool exhaust gas to a predetermined temperature according to a kind of the absorption liquid by means of cooling liquid circulated; the washing water circulation module can include a washing water circulation tank that collects washing water passing through the washing module, a pH meter that measures pH of the washing water from the washing water circulation tank so that the neutralizer supply valve is adjusted to determine a neutralizer injection amount, a buffer tank that stores an initial amount of washing water to replenish the washing water, and a washing water circulation pump that circulates a portion of the washing water to the buffer tank and a portion of the washing water to the washing module; the water treatment module can include a water treatment unit that performs water treatment on the washing water discharged from the buffer tank and returns the water-treated washing water to the buffer tank, a sludge tank that stores sludge generated by the water treatment unit, an overboard discharge valve that discharges the washing water satisfying a predetermined discharge condition overboard by means of the water treatment unit, and a washing water discharge tank that temporarily stores the washing water from the buffer tank.

[0014] In addition, a washing water cooling unit that cools the circulating washing water can be further included at a rear end of the washing water circulation pump.

[0015] In addition, the CO2 absorption section can include an absorption liquid storage tank that stores the absorption liquid, one or more injection nozzles that inject the absorption liquid, one or more flow paths that contact CO2 with the absorption liquid to convert the CO2 into a predetermined substance by means of a chemical reaction, and an absorption liquid injection pump that sucks the absorption liquid to the one or more injection nozzles, and a cooling module that circulates cooling liquid in the one or more flow paths to cool heat generated due to a CO2 absorption reaction.

[0016] In addition, the one or more injection nozzles can include upper and lower end injection nozzles that inject the absorption liquid downward, the one or more flow paths can include upper and lower end flow paths that contact CO2 with the absorption liquid to convert the CO2 into a predetermined substance by means of a chemical reaction, the absorption liquid injection pump can suck the absorption liquid to the upper and lower end injection nozzles, the cooling module can circulate cooling liquid in the upper and lower end flow paths to cool heat generated due to a CO2 absorption reaction, and the CO2 absorption section can further include a mist eliminator formed in a zigzag multi-piece shape to remove moisture from exhaust gas passing through the lower end flow path, and an exhaust gas recirculation fan that increases pressure of the exhaust gas from which the moisture is removed so as to be recirculated to the combustion air receiver.

[0017] In addition, the upper end flow path or the lower end flow path can be composed of a plurality of segments and partition walls, and the flow path can be formed long to increase the contact time of the absorbent liquid with the exhaust gas.

[0018] In addition, a packing material composed of a plurality of segments of distillation tower packing designed to increase the contact area per unit volume to increase the contact time of the absorbent liquid with the exhaust gas, and a solution redistributor formed between the plurality of segments of the distillation tower packing can be formed on the upper end flow path or the lower end flow path.

[0019] In addition, the absorbent liquid storage tank can store NH4OH(aq) as the absorbent liquid, and by means of the upper end flow path and the lower end flow path, NH4OH(aq) can be converted into NH4HCO3(aq) by absorbing CO2, and the cooling module can be configured in the form of a cooling jacket or a cooling coil in the upper end flow path and the lower end flow path to cool the heat generated due to the CO2 absorption reaction to 20°C to 50°C.

[0020] In addition, the absorbent liquid storage tank can store NaOH as the absorbent liquid, and by means of the upper end flow path and the lower end flow path, NaOH can be converted into NaHCO3 or Na2CO3 by absorbing CO2, and the cooling module can cool the heat generated due to the CO2 absorption reaction to 80°C to 100°C.

[0021] In addition, in the Tier II mode operation, the inflow of combustion air to the exhaust gas recirculation fan can be prevented by means of a valve at the outlet side of the exhaust gas recirculation fan, and the supply pressure of the exhaust gas recirculation fan can be adjusted according to the pressure of the combustion air to increase the pressure of the exhaust gas from which moisture is removed.

[0022] In addition, a supercharger can be further included, and the supercharger can include a turbine that rotates by means of high-temperature and high-pressure exhaust gas supplied from the exhaust gas receiver, a compressor that rotates in conjunction with the rotation shaft of the turbine to compress and supply combustion air to the combustion air receiver, an air suction filter that is formed at the suction inlet side of the compressor to filter foreign substances, a combustion air cooling module that cools the combustion air supplied from the compressor to the combustion air receiver, a first adjustment valve that adjusts the flow rate of exhaust gas from the exhaust gas receiver to the turbine, and a second adjustment valve that is formed at the front end of the first adjustment valve to adjust the flow rate of exhaust gas to the cleaning portion.

[0023] Additionally, a third regulating valve may be included to adjust the flow rate of exhaust gas from the exhaust gas receiver to the cleaning section. In cases where it is anticipated that the exhaust gas utilization-related devices connected to the exhaust gas pipe of the turbine may be damaged due to high load or high temperature exhaust gas, the opening and closing of the third regulating valve can be controlled to increase the flow rate of exhaust gas to the cleaning section and reduce the temperature of the exhaust gas.

[0024] Additionally, the combustion air cooling module may include: one or more cooling sleeves that circulate coolant to cool the combustion air; and a mist eliminator formed in a tortuous multi-bladed shape to remove moisture from the combustion air passing through the cooling sleeves.

[0025] Additionally, it may include an absorbent tank for separating and storing the absorbent discharged from the CO2 absorption unit, and the effluent discharged from the CO2 absorption unit may be stored in the sludge tank or discharged off the ship.

[0026] In addition, the cleaning unit and the CO2 absorption unit can be configured to be installed inside the ship's engine.

[0027] On the other hand, in order to achieve the aforementioned objectives, the present invention can provide a ship equipped with the aforementioned ship's EGR combined with greenhouse gas emission reduction device.

[0028] Beneficial effects

[0029] According to the present invention, the advantage is that, for ships that have previously used fossil fuels for navigation or planned construction, NOx, which is the original purpose of EGR, is reduced while maintaining EGR. X It generates and absorbs not only CO2, a typical greenhouse gas, but also SO2. X It can be converted into substances that do not harm the environment and discharged, or stored as useful substances.

[0030] In addition, storing the absorbed CO2 inside the ship allows for post-voyage treatment, reducing the likelihood of marine pollution.

[0031] In addition, SO2 is removed from the recirculated exhaust gas. X It contains CO2, which can prevent engine corrosion and reduce environmental pollution.

[0032] Furthermore, the configuration of being installed inside the ship's engine has the advantages of saving installation space, ensuring available space, and being able to be added to ships that already have an EGR system installed, reducing the need for modifications and making it easy to add to ships that already have an EGR system installed. Attached Figure Description

[0033] Figure 1FIG. 1 is a schematic configuration diagram of an EGR combined greenhouse gas reduction device of a ship according to an embodiment of the present application.

[0034] Figure 2 FIG. 2 is a system hydraulic circuit diagram of the EGR combined greenhouse gas reduction device of the ship according to the embodiment of the present application. Figure 1

[0035] Figure 3 FIG. 4 is a waste gas receiver and a supercharger of the EGR combined greenhouse gas reduction device of the ship according to the embodiment of the present application. Figure 2

[0036] Figure 4 FIG. 6 is a cleaning section of the EGR combined greenhouse gas reduction device of the ship according to the embodiment of the present application. Figure 2

[0037] Figure 5 FIG. 8 is a CO2 absorbing section of the EGR combined greenhouse gas reduction device of the ship according to the embodiment of the present application. Figure 2 DETAILED DESCRIPTION

[0038] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present application pertains can easily implement the present application. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0039] If referring to Figure 1 , the gist of the EGR combined greenhouse gas reduction device of the ship according to the embodiment of the present application is to include, in its entirety, a waste gas receiver 110 temporarily storing and removing pulsation of the waste gas discharged from each cylinder of a ship engine 10 after combustion, a cleaning section 120 spraying cleaning water to the waste gas from the waste gas receiver 110, cleaning and removing SOx and soot, circulating and cooling the waste gas, a CO2 absorbing section 130 spraying absorbing liquid to the waste gas passing through the cleaning section 120, absorbing and removing CO2, and a combustion air receiver 140 temporarily storing the waste gas passing through the CO2 absorbing section 130, removing pulsation, mixing with combustion air, and supplying air to each cylinder of the ship engine 10. It is possible to reduce NOx, which is the original purpose of EGR, while maintaining the original EGR, and to absorb not only CO2, which is a representative greenhouse gas, but also SOx, which can be converted into a substance that does not affect the environment and is discharged, or stored as a useful substance, preventing corrosion of the engine and improving combustion quality. X X X

[0040] Hereinafter, the foregoing EGR combined greenhouse gas reduction device of the ship will be described in detail with reference to Figures 1 to 5 ​​​​​​​​

[0041] First, an exhaust gas receiver 110 temporarily stores high-temperature and high-pressure exhaust gas discharged from exhaust ports of combustion chambers of each cylinder (not shown) of the marine engine 10 by the exhaust stroke after combustion, removes pulsation of the exhaust gas, and supplies the exhaust gas to the cleaning section 120 or the supercharger 150 at the rear end by opening and closing of a regulating valve, as shown in Figure 2 and Figure 3

[0042] For example, since the ignition order of each cylinder is different, the exhaust gas is pulsated at different discharge points in time, and the exhaust gas receiver 110 has a capacity suitable for removing the pulsation of the exhaust gas pressure, is formed in a cylindrical shape capable of maintaining the temperature, is connected at one side to the exhaust ports of the combustion chambers, and is connected at the other side to the turbine 151 inlet side of the supercharger 150 or the cleaning module 122 inlet side of the cleaning section 120.

[0043] Then, the cleaning section (EGR) 120, as a constituent element for performing cleaning, cooling, and neutralization of the exhaust gas, sequentially sprays cleaning water first and second to the exhaust gas supplied from the exhaust gas receiver 110, removes SO X and soot contained in the exhaust gas by cleaning, circulates the cooling liquid, cools the exhaust gas, and supplies the exhaust gas to the CO2 absorbing section 130.

[0044] For reference, in the combustion chamber, a part of oxygen contained in the combustion air is burned with the fuel to generate CO2, and the rest generates NO X and SO X The cleaning section 120 cleans and cools the exhaust gas containing a large amount of CO2 after combustion, together with the combustion air from the supercharger 150, supplies only the minimum oxygen required for combustion to the combustion chamber of the marine engine 10, increases the CO2 concentration of the combustion air itself, reduces the oxygen concentration, and suppresses the generation of NO X .

[0045] On the other hand, the amount of reduction of NO X is also increased in proportion to the recirculation ratio of the exhaust gas, and 30% to 40% or so of the total exhaust gas is recirculated to supply air to the marine engine 10.

[0046] Specifically, the cleaning section 120 sprays cleaning water to the exhaust gas supplied from the exhaust gas receiver 110 through the cleaning module 122, as shown in Figure 2 and Figure 4 ​As shown, it can include: a cleaning water supply module 121 that receives fresh water to neutralize and supply cleaning water; a cleaning module 122 that sprays cleaning water from the cleaning water supply module 121 to exhaust gas from the exhaust gas receiver 110 to cool and clean it; a cooling module 123 that cools by cooling liquid; a cleaning water circulation module 124 that recycles cleaning water that passes through the cleaning module 122; and a water treatment system (WTS) 125 that performs water treatment on the cleaning water.

[0047] The cleaning water supply module 121 is composed of a cleaning water replenishment pump 121b that replenishes cleaning water by receiving supply of fresh water through a fresh water supply valve 121a and supplies it to the cleaning module, and a neutralizing agent supply valve 121c that injects a neutralizing agent for removing SOx and NOx from the cleaning water supplied from the cleaning water replenishment pump 121b to the cleaning module 122. X The generated sulfuric acid requires a basic neutralizing agent.

[0048] In addition, the cleaning module 122 is composed of a first cleaning unit 122a at the front end that first sprays cleaning water supplied from the cleaning water supply module 121 or the cleaning water circulation module 124 to exhaust gas to cool it to 200 to 300°C and clean it to remove SOx and particulate components such as soot, and a second cleaning unit 122b at the rear end that second sprays (EGR cooler spray) cleaning water to cool exhaust gas to about 45°C and clean it to remove SOx and particulate components such as soot. X X

[0049] In addition, the cooling module 123 is composed of a first cooling unit 123a formed at the lower end of the first cleaning unit 122a that cools exhaust gas to a predetermined temperature according to the type of absorbent liquid used to absorb CO2 by circulating cooling liquid, and a second cooling unit 123b formed at the lower end of the second cleaning unit 122b that cools exhaust gas to a predetermined temperature according to the type of absorbent liquid used to absorb CO2 by circulating cooling liquid.

[0050] ​​In addition, the cleaning water circulation module 124 includes a cleaning water circulation tank 124a which collects the cleaning water passing through the cleaning module 122, a pH meter 124b which measures the pH of the cleaning water from the cleaning water circulation tank 124a so that the neutralizer supply valve 121c determines the amount of the basic neutralizer to be injected, a buffer tank 124c which stores the initial amount of the cleaning water to supplement the cleaning water of the cleaning module 122, and a cleaning water circulation pump 124d which circulates a portion of the cleaning water to the buffer tank 124c and a portion of the cleaning water to the cleaning module 122.

[0051] The pH meter 124b can measure the pH of the cleaning water containing sulfuric acid resulting from the circulation, and based on the measured pH, the amount of the basic neutralizer, for example, the amount of NaOH, can be adjusted by means of the neutralizer supply valve 121c so that the cleaning water is neutralized, preventing corrosion of the components related to the line through which the cleaning water is circulated. The buffer tank 124c can collect and remove additional moisture incidentally generated due to the combustion of the exhaust gas, and store and supplement the cleaning water purified by means of the water treatment module 125.

[0052] On the other hand, the cleaning water circulation module 124 can further include a cleaning water cooling unit 124e installed at the rear end of the cleaning water circulation pump 124d to cool the cleaning water being circulated, and can supply the cleaning water cooled to a lower temperature to the cleaning module 122.

[0053] For example, in the case where NH4OH(aq) is used as the absorption liquid of the CO2 absorption section 130, the temperature of the exhaust gas passing through the cleaning module 122 is preferably about 20 to 50°C, and in the case where NaOH is used as the absorption liquid of the CO2 absorption section 130, the temperature of the exhaust gas is preferably about 80 to 100°C. The amount and temperature of the cleaning water can be different depending on the absorption liquid used, and thus the combination of the cleaning module 122 and the cleaning water cooling unit 124e can be variously configured so as to satisfy the CO2 absorption temperature condition of the CO2 absorption section 130 while maintaining the cleaning power of the cleaning water against the exhaust gas. Also, the heat exchanger specifications of the first cleaning unit 122a and the second cleaning unit 122b can be variously configured.

[0054] The water treatment module 125 includes: a water treatment unit 125a, which treats the cleaning water discharged from the buffer tank 124c by means of centrifugation or filtration, so that the treated cleaning water returns to the buffer tank 124c; a sludge tank 125b, which stores the sludge discharged from the water treatment unit 125a; an overboard discharge valve 125c, which discharges the cleaning water that meets the predetermined overboard discharge conditions overboard with the help of the water treatment unit 125a; and a cleaning water drain tank 125d, which temporarily stores the cleaning water from the buffer tank 124c; thereby separating and storing sediments such as carbon soot contained in the cleaning water, and discharging the separated effluent overboard.

[0055] Then, the CO2 absorption section 130 sprays absorbent liquid into the exhaust gas passing through the cleaning section 120, thereby absorbing and removing CO2.

[0056] Specifically, such as Figure 2 and Figure 5 As shown, the CO2 absorption unit 130 includes: an absorbent storage tank 131 storing absorbent that removes CO2 through a chemical reaction; an upper spray nozzle 132 spraying the absorbent downwards; an upper flow path 133 enabling physical contact between CO2 and the absorbent, converting CO2 into NH4HCO3, NaHCO3, or Na2CO3 through a chemical reaction; a lower spray nozzle 144 spraying the absorbent downwards; and a lower flow path 135 enabling physical contact between CO2 and the absorbent, converting CO2 into NH4HCO3, NaHCO3, or Na2CO3 through a chemical reaction. 2 is converted into NH4HCO3, NaHCO3, or Na2CO3; an absorbent injection pump 136 draws absorbent from an upper injection nozzle 132 and a lower injection nozzle 134; a cooling module 137 circulates coolant between an upper flow path 133 and a lower flow path 135 to cool the heat generated by the CO2 absorption reaction; a mist eliminator 138 is formed in a tortuous multi-blade shape to remove moisture from the exhaust gas passing through the lower flow path 135; and an exhaust gas recirculation fan 139 increases the pressure of the moisture-removed exhaust gas and recirculates it to the combustion air receiver 140.

[0057] The absorbent can be prepared and supplied immediately by other equipment on board, or it can be supplied by suction in the form of absorbent storage tank 131. The upper spray nozzle 132 and the lower spray nozzle 134 can be configured with multiple auxiliary pipes connected to the main pipe to form multiple spray holes.

[0058] On the other hand, the upper end flow path 133 or the lower end flow path 135 is composed of a plurality of segments and partition walls, and a flow path is formed long to increase the contact time of the absorbent liquid with the exhaust gas, so that CO2 is sufficiently absorbed, dissolved, or converted into a substance satisfying the condition for overboard discharge by means of the absorbent liquid.

[0059] In addition, a packing material 133a, 135a composed of distilling column packing designed to increase the contact area per unit volume so as to increase the contact time of the absorbent liquid with the exhaust gas, and a solution redistributor (not shown in the drawing) formed between the distilling column packings composed of a plurality of segments can be formed on the upper end flow path 133 or the lower end flow path 135.

[0060] For example, the distilling column packing suitable for the process can be selected in consideration of the contact area per unit volume, the pressure drop of the gas, and the flooding speed, so that the channeling phenomenon of the clean water can be prevented by means of the solution redistributor.

[0061] On the other hand, depending on the selection of the absorbent liquid that absorbs CO2, the product and the cooling method are different, that is, in the case where NH4OH (aq) is used as the absorbent liquid, the absorbent liquid storage tank 131 stores NH4OH (aq) as the absorbent liquid, CO2 is absorbed and converted into NH4HCO3 (aq) according to the following [Chemical Formula 1] or [Chemical Formula 2] by means of NH4OH (aq) passing through the upper end flow path 133 and the lower end flow path 135, and the cooling module 123 is configured in the form of a cooling jacket or a cooling coil in the upper end flow path 133 and the lower end flow path 135, and the heat generated due to the CO2 absorption reaction is cooled to 20°C to 50°C, so that the smooth forward reaction of [Chemical Formula 1] or [Chemical Formula 2] can be induced.

[0062] That is, in the case where 20°C is not reached, the CO2 absorption rate decreases, and in the case where 50°C is exceeded, the CO2 absorption rate increases, but there is a disadvantage that NH3 is vaporized and lost, and it is preferable to be maintained at 20°C to 50°C.

[0063] [Chemical Formula 1]

[0064] NH4OH + H2CO3 → H2O + NH4HCO3

[0065] [Chemical Formula 2]

[0066] 2NH4OH + CO2 → (NH4)2CO3 + H2O

[0067] (NH4)2CO3 + CO2 + H2O → 2NH4HCO3

[0068] Alternatively, in the case of using NaOH as the absorbent liquid, the absorbent liquid storage tank 131 stores NaOH as the absorbent liquid, absorbs CO2 to convert into Na2CO3 or NaHCO3 by means of NaOH passing through the upper end flow path 133 and the lower end flow path 135, for example, according to [Chemical Formula 3] or [Chemical Formula 4] below, and the cooling module 123 cools the heat generated due to the CO2 absorption reaction to 80 to 100°C, which can induce the smooth forward reaction of [Chemical Formula 3] or [Chemical Formula 4].

[0069] [Chemical Formula 3]

[0070] 2NaOH (aq) + CO2 (g) → Na2CO3 (aq) + H2O (I)

[0071] [Chemical Formula 4]

[0072] Na2CO3 (aq) + H2O (I) → 2NaHCO3 (aq)

[0073] On the other hand, in the Emission Control Area (ECA) where Tier III of the NOx emission standard is applied, EGR needs to be driven to reduce the NOx of the exhaust gas below the NOx emission standard, but in the Tier II mode of operation applied on the open sea where EGR does not need to be driven, the backflow of the combustion air to the exhaust gas recirculation fan 139 is prevented by the valve 139a on the outlet side of the exhaust gas recirculation fan 139, and the supply pressure of the exhaust gas recirculation fan 139 is adjusted in the RPM adjustment mode (VFD: Variable Frequency Driver) according to the pressure of the combustion air, which can increase the pressure of the exhaust gas from which the moisture has been removed.

[0074] In addition, an absorbent liquid tank 139b that separates and stores the absorbent liquid discharged from the upper end flow path 133 and the lower end flow path 135 of the CO2 absorption section 130 can also be included, and the absorbent liquid can be subjected to a regeneration treatment so as to be reused or disposed of. The discharge from the CO2 absorption section 130 can be stored in the sludge tank 125b or discharged outside the ship by means of valve adjustment.

[0075] Then, the scavenge air receiver 140 temporarily stores the exhaust gas from which CO2 has been removed and the oxygen concentration has decreased, which passes through the CO2 absorption section 130, as shown in Figure 2 After the pulsation is removed, the exhaust gas is mixed with the combustion air in the suction stroke and is supplied to each cylinder of the marine engine 10.

[0076] For example, due to the different firing order of each cylinder, the intake time of combustion air is different, resulting in pulsation. The combustion air receiver 140 has a capacity suitable for removing the pulsation of combustion air pressure. It is formed in the shape of a heat-insulating cylinder, with one side connected to the combustion air intake of the combustion chamber, and the other side connected to the outlet side of the compressor 152 of the CO2 absorption section 130 or the turbocharger 150, or the combustion air cooling module 154.

[0077] Then, the turbocharger 150, such as Figure 3 As shown, the system includes: a turbine 151, which rotates by means of high-temperature, high-pressure exhaust gas supplied from an exhaust gas receiver 110; a compressor 152, which rotates in conjunction with the rotating shaft of the turbine 151 to compress combustion air and supply it to a combustion air receiver 140; an air intake filter 153, which is formed on the intake side of the compressor 152 to filter foreign matter; a combustion air cooling module 154, which cools the combustion air supplied from the compressor 152 to the combustion air receiver 140; a first regulating valve 155, which regulates the exhaust gas flow rate from the exhaust gas receiver 110 to the turbine 151; and a second regulating valve 156, which is formed at the front end of the first regulating valve 155 to regulate the exhaust gas flow rate to the cleaning section 120; thereby utilizing the high-temperature, high-pressure energy of the exhaust gas to compress the combustion air and improve engine efficiency.

[0078] On the other hand, it may also include a third regulating valve 157 that regulates the flow rate of exhaust gas from the exhaust gas receiver 110 to the cleaning section 120. The opening and closing of the third regulating valve 157 can be controlled in case the exhaust gas utilization related device, such as a steam generator connected to the exhaust gas pipe A connected to the outlet side of the turbine 151 is damaged due to high load or high temperature exhaust gas, thereby increasing the exhaust gas flow rate to the cleaning section 120 and reducing the temperature of the exhaust gas.

[0079] In addition, the combustion air cooling module 154 includes: a cooling sleeve 154a with one or two sections, the cooling sleeve 154a circulating coolant to cool the combustion air; and a mist eliminator 154b, the mist eliminator 154b being formed in a tortuous multi-blade shape to remove moisture from the combustion air passing through the cooling sleeve 154a; thereby reducing the temperature rise caused by the compressor 152 compressing the combustion air, improving the turbocharger efficiency, increasing air density, and improving the efficiency of the marine engine 10.

[0080] On the other hand, the cleaning unit 120 and the CO2 absorption unit 130 are configured to be installed inside the ship's engine 10, which can save installation space and make them available for additional installation on ships that have already installed the original EGR system, thus reducing the need for modifications.

[0081] Therefore, according to the constitution of the EGR combined with the greenhouse gas emission reduction device of the ship as described above, the NOx which is the original purpose of the EGR can be reduced while keeping the original EGR X generated, and not only absorbs CO2 which is the representative greenhouse gas, but also absorbs SOx X , can be converted into a substance which does not affect the environment and discharged, or stored as a useful substance, can prevent the corrosion of the engine, improve the combustion quality, can remove SOx and CO2 in the recirculated exhaust gas, prevent the corrosion of the engine, reduce the environmental pollution, and can be constituted in a form of being installed inside the ship engine, can save the installation space, can ensure the free space, and can be constituted to be additionally installed in the ship which has installed the original EGR system, and reduce the change items. X and CO2, prevent the corrosion of the engine, reduce the environmental pollution, and can be constituted in a form of being installed inside the ship engine, can save the installation space, can ensure the free space, and can be constituted to be additionally installed in the ship which has installed the original EGR system, and reduce the change items.

[0082] The present application has been described above with reference to the embodiment with reference to the accompanying drawings. However, the present application is not limited to this, and various modifications or other embodiments which belong to the equivalent scope of the present application can be implemented by those skilled in the art to which the present application belongs. Therefore, the true protection scope of the present application should be determined according to the claims.

Claims

1. An EGR combined greenhouse gas reduction device for a ship, comprising: an exhaust gas receiver temporarily storing exhaust gas discharged from each cylinder of a ship engine and removing pulsation; a CO2 absorption section absorbing and removing CO2 by injecting an absorption liquid into the exhaust gas passing through the cleaning section; and a combustion air receiver temporarily storing the exhaust gas passing through the CO2 absorption section, removing pulsation, mixing with combustion air, and supplying air to each cylinder of the ship engine, wherein the CO2 absorption section includes: an absorption liquid storage tank storing the absorption liquid; one or more injection nozzles injecting the absorption liquid; one or more flow paths contacting CO2 with the absorption liquid to convert CO2 into a predetermined substance by a chemical reaction; an absorption liquid injection pump pumping the absorption liquid to the one or more injection nozzles; and a cooling module circulating a cooling liquid through the one or more flow paths to cool heat generated by the CO2 absorption reaction.

2. The EGR combined greenhouse gas reduction device for a ship according to claim 1, wherein the cleaning section includes: a cleaning water supply module neutralizing and supplying cleaning water by receiving clean water; a cleaning module injecting cleaning water from the cleaning water supply module into the exhaust gas from the exhaust gas receiver to cool and clean; a cooling module cooling by a cooling liquid; a cleaning water circulation module circulating cleaning water passing through the cleaning module; and a water treatment module water-treating cleaning water. a cleaning section that sprays cleaning water to exhaust gas from the exhaust gas receiver to clean and remove SOx and soot, and circulates the cooling liquid to cool the exhaust gas X and soot, and circulates the cooling liquid to cool the exhaust gas 3. The EGR combined greenhouse gas reduction device for a ship according to claim 2, wherein the cleaning water supply module includes: a cleaning water replenishment pump replenishing cleaning water by receiving supply of clean water and supplying the cleaning module; and a neutralizing agent supply valve injecting a neutralizing agent for adjusting pH into cleaning water supplied from the cleaning water replenishment pump to the cleaning module; the cooling module includes one or more cooling units formed at a lower end of the one or more cleaning units to cool exhaust gas to a predetermined temperature according to a kind of the absorption liquid by the cooling liquid circulating; and the cleaning water circulation module includes: a cleaning water circulation tank collecting cleaning water passing through the cleaning module; a pH meter measuring pH of cleaning water from the cleaning water circulation tank to adjust the neutralizing agent supply valve to determine an injection amount of the neutralizing agent; a buffer tank storing an initial amount of cleaning water to replenish cleaning water; and a cleaning water circulation pump circulating a part of cleaning water to the buffer tank and a part of cleaning water to the cleaning module. ​ ​ ​ ​ ​ ​ ​ ​ The cleaning module includes one or more cleaning units that spray cleaning water to remove SOx X and soot; ​ ​ The water treatment module includes: a water treatment unit that performs water treatment on the cleaning water discharged from the buffer tank, and returns the water-treated cleaning water to the buffer tank; a sludge tank that stores sludge generated by the water treatment unit; an overboard discharge valve that discharges the cleaning water satisfying a predetermined discharge condition overboard by means of the water treatment unit; and a cleaning water discharge tank that temporarily stores the cleaning water from the buffer tank.

4. The EGR combined greenhouse gas emission reduction device for a ship according to claim 3, further comprising: a cleaning water cooling unit installed at a rear end of the cleaning water circulating pump, and cooling the circulating cleaning water.

5. The EGR combined greenhouse gas emission reduction device for a ship according to claim 1, further comprising: a cooling module installed at a rear end of the CO2 absorption unit, and cooling the heat generated by the CO2 absorption reaction. The one or more injection nozzles include an upper end injection nozzle and a lower end injection nozzle that inject the absorption liquid downward, The one or more flow paths include an upper end flow path and a lower end flow path that contact the CO2 with the absorption liquid to convert the CO2 into a predetermined substance by means of a chemical reaction, The absorption liquid injection pump draws the absorption liquid to the upper end injection nozzle and the lower end injection nozzle, The cooling module circulates a cooling liquid between the upper end flow path and the lower end flow path to cool the heat generated by the CO2 absorption reaction, The CO2 absorption unit further includes: a mist eliminator formed in a zigzag multi-piece shape to remove moisture from the exhaust gas passing through the lower end flow path; and an exhaust gas recirculation fan that increases the pressure of the exhaust gas from which the moisture is removed to be recirculated to the combustion air receiver.

6. The EGR combined greenhouse gas emission reduction device for a ship according to claim 5, wherein: the upper end flow path or the lower end flow path is composed of a plurality of segments and partitions, and is formed long to increase the contact time of the absorption liquid with the exhaust gas.

7. The EGR combined greenhouse gas emission reduction device for a ship according to claim 5, wherein: a packing material composed of a distillation column packing designed to increase the contact area per unit volume to increase the contact time of the absorption liquid with the exhaust gas and a solution redistributor are formed on the upper end flow path or the lower end flow path.

8. The EGR combined greenhouse gas emission reduction device for a ship according to claim 5, wherein: the absorption liquid storage tank stores NH4OH(aq) as the absorption liquid, CO2 is converted into NH4HCO3(aq) by means of NH4OH(aq) absorption by means of the upper end flow path and the lower end flow path, The cooling module is configured in a cooling jacket or cooling coil shape in the upper end flow path and the lower end flow path to cool the heat generated by the CO2 absorption reaction to 20°C to 50°C.

9. The EGR combined greenhouse gas emission reduction device for a ship according to claim 5, wherein: the absorption liquid storage tank stores NaOH as the absorption liquid, ​ ​ ​ ​ ​ By means of the upper end flow path and the lower end flow path, CO2 is absorbed by NaOH to be converted into NaHCO3 or Na2CO3, The cooling module cools the heat generated by the CO2 absorption reaction to 80 to 100°C.

10. The EGR combined greenhouse gas reduction device for a ship according to claim 5, wherein When the engine is operated in the mode II, the valve on the outlet side of the exhaust gas recirculation fan prevents the reverse flow of the combustion air to the exhaust gas recirculation fan, The supply air pressure of the exhaust gas recirculation fan is adjusted according to the pressure of the combustion air, and the pressure of the exhaust gas from which the moisture is removed is increased.

11. The EGR combined greenhouse gas reduction device for a ship according to claim 1, wherein The device further comprises a supercharger including a turbine that rotates by means of the high-temperature and high-pressure exhaust gas supplied from the exhaust gas receiver, a compressor that rotates in conjunction with the rotating shaft of the turbine, compresses the combustion air, and supplies it to the combustion air receiver, an air suction filter that is formed on the suction inlet side of the compressor and filters foreign substances, a combustion air cooling module that cools the combustion air supplied from the compressor to the combustion air receiver, a first adjusting valve that adjusts the exhaust gas flow from the exhaust gas receiver to the turbine, and a second adjusting valve that is formed on the front end of the first adjusting valve and adjusts the exhaust gas flow to the cleaning section.

12. The EGR combined greenhouse gas reduction device for a ship according to claim 11, wherein The device further comprises a third adjusting valve that adjusts the exhaust gas flow from the exhaust gas receiver to the cleaning section, In the case where the exhaust gas utilization-related device that is combined with the exhaust gas pipe connected to the turbine is damaged by the high-load or high-temperature exhaust gas, the opening and closing of the third adjusting valve are controlled so that the exhaust gas flow to the cleaning section is increased and the temperature of the exhaust gas is decreased.

13. The EGR combined greenhouse gas reduction device for a ship according to claim 11, wherein The combustion air cooling module includes one or more cooling jackets that circulate a cooling liquid and cool the combustion air, and a mist eliminator that is formed in a zigzag shape of multiple pieces and removes the moisture of the combustion air that passes through the cooling jackets.

14. The EGR combined greenhouse gas reduction device for a ship according to claim 3, wherein The device further comprises an absorbent tank that separates and stores the absorbent liquid discharged from the CO2 absorption section, The discharge from the CO2 absorption section is stored in the sludge tank or discharged outside the ship.

15. The EGR combined greenhouse gas reduction device for a ship according to claim 1, wherein The cleaning section and the CO2 absorption section are configured in a form of being installed inside the engine of the ship.

16. A ship equipped with the EGR combined greenhouse gas reduction device for a ship according to any one of claims 1 to 15.

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