Ammonia treatment system and ship including same

Abstract

An embodiment of the present invention provides an ammonia treatment system and a ship including same. The ammonia treatment system comprises: a fuel storage unit for storing ammonia; a fuel supply unit for supplying ammonia from the fuel storage unit to an engine; a fuel treatment unit for recovering surplus ammonia generated in the engine and treating the recovered surplus ammonia with wastewater; and a wastewater supply unit for supplying ammonia wastewater treated by the fuel treatment unit to the engine.

Description

Ammonia treatment system and a vessel including the same

[0001] The present invention relates to an ammonia treatment system and a vessel including the same.

[0002] Air pollution is becoming severe worldwide and is causing climate change. Because pollutants emitted from ships have a significant impact on air quality, the International Maritime Organization (IMO), the European Union, and the United States are strengthening regulations on pollutants emitted from vessels to reduce air pollution.

[0003] As regulations on greenhouse gas emissions from ships are gradually strengthened at key milestones by 2050, it is expected that it will be difficult to comply with pollution regulations using only existing engines and fuels.

[0004] Therefore, with the application of strengthened regulations on greenhouse gas emissions from ships, the use of existing fossil fuels is expected to become difficult, making it urgent to identify alternative fuels capable of meeting future stricter regulations. As alternatives, non-fossil fuels such as ammonia (NH3), biofuels, solar energy, and wind energy are currently being considered.

[0005] Among these, ammonia is a chemical that can be produced, stored, transported, and supplied, and ammonia-fueled ships are being developed. Ammonia is attracting attention as an eco-friendly fuel because it does not contain carbon, but it has characteristics that are relatively disadvantageous for combustion compared to conventionally used fuels.

[0006] For example, when ammonia is used as fuel, the combustion reactivity of ammonia gas is lower than that of other fuels, so the exhaust gas may contain unburned ammonia (ammonia slip). As unburned ammonia is a toxic substance, if it is emitted without treatment, it can cause environmental pollution or inflict physical harm on people in the surrounding area.

[0007] To overcome the limitations of such ammonia fuel, technology for safely treating ammonia gas is required.

[0008] The present invention provides an ammonia treatment system and a ship including the same, which can reduce harmful substances and minimize environmental pollution and improve engine performance by effectively treating ammonia wastewater.

[0009] In addition, the present invention provides an ammonia treatment system capable of effectively lowering the concentration of ammonia gas and discharging it with a simple structure, thereby preventing environmental pollution, and a vessel including the same.

[0010] According to one embodiment of the present invention, an ammonia treatment system is provided, comprising: a fuel storage unit for storing ammonia; a fuel supply unit for supplying ammonia from the fuel storage unit to an engine; a fuel treatment unit for recovering excess ammonia generated in the engine and treating the recovered excess ammonia as wastewater; and a wastewater supply unit for supplying the ammonia wastewater treated in the fuel treatment unit to the engine.

[0011] In the ammonia treatment system described above, the engine may include an internal combustion engine, and the wastewater supply unit may supply the ammonia wastewater after the piston top dead center of the internal combustion engine.

[0012] In the ammonia treatment system described above, the ammonia can be injected into the interior of the engine through a fuel injection nozzle, the ammonia wastewater can be injected into the interior of the engine through a wastewater injection nozzle, and the wastewater injection nozzle can inject the ammonia wastewater toward the injection port of the fuel injection nozzle.

[0013] In the ammonia treatment system described above, the wastewater supply unit may include a wastewater supply path disposed between the fuel treatment unit and the engine; and a wastewater supply pump disposed in the wastewater supply path.

[0014] The ammonia treatment system described above may further include an exhaust unit for discharging ammonia gas generated in the fuel treatment unit to the outside; and an air supply unit for supplying air supplied to the engine to the exhaust unit.

[0015] In the ammonia treatment system described above, the air supply unit may include: an air supply passage disposed between the engine and the exhaust unit; a sensing sensor that detects the concentration of ammonia gas in the exhaust unit; and a control valve disposed in the air supply passage and controlling the flow of air according to the concentration of ammonia gas detected by the sensing sensor.

[0016] In the ammonia treatment system described above, the exhaust unit can discharge the ammonia gas to the outside when the concentration of the ammonia gas in the exhaust unit is below the exhaustable concentration, and the air supply unit can supply the air when the concentration of the ammonia gas in the exhaust unit exceeds the exhaustable concentration.

[0017] In the ammonia treatment system described above, the air supply unit can supply air until the concentration of ammonia gas in the exhaust unit reaches a concentration below the exhaustable concentration.

[0018] The above-described ammonia treatment system may further include a harmful substance treatment unit that removes harmful substances generated during combustion of the engine and discharges them to the outside.

[0019] According to one embodiment of the present invention, the vessel may include: a hull; and an ammonia treatment system accommodated in the hull; wherein the ammonia treatment system comprises: a fuel storage unit for storing ammonia; a fuel supply unit for supplying ammonia from the fuel storage unit to an engine; a fuel treatment unit for recovering excess ammonia generated in the engine and treating the recovered excess ammonia as wastewater; and a wastewater supply unit for supplying the ammonia wastewater treated in the fuel treatment unit to the engine.

[0020] An ammonia treatment system according to one embodiment of the present invention and a vessel including the same can minimize environmental pollution by reducing harmful substances through the supply and removal of ammonia wastewater during the combustion process of an engine, and can improve engine performance by lowering the maximum temperature relative to the same combustion pressure of the engine.

[0021] In addition, an ammonia treatment system according to one embodiment of the present invention and a vessel including the same can reduce nitrogen oxides generated during combustion of an engine, thereby minimizing the use of urea solution for removing nitrogen oxides.

[0022] In addition, the ammonia treatment system according to one embodiment of the present invention and the vessel including the same can effectively reduce the concentration of ammonia gas and discharge it with a simple structure, thereby preventing environmental pollution.

[0023] Of course, the scope of the present invention is not limited by these effects.

[0024] FIG. 1 is a schematic diagram illustrating an ammonia treatment system according to one embodiment of the present invention.

[0025] Figure 2 is a partial configuration diagram illustrating an embodiment of the heating unit of Figure 1.

[0026] Figure 3 is a block diagram illustrating the main configuration of the ammonia treatment system of Figure 1.

[0027] Figure 4 is a schematic diagram illustrating the supply of ammonia wastewater in the ammonia treatment system of Figure 1.

[0028] FIG. 5 is a schematic diagram illustrating an ammonia treatment system according to another embodiment of the present invention.

[0029] Figure 6 is a block diagram illustrating the main configuration of the ammonia treatment system of Figure 5.

[0030] Figure 7 is a schematic diagram illustrating that air supplied to the engine in the ammonia treatment system of Figure 5 is supplied to the exhaust section.

[0031] The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms.

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted.

[0033] In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0034] In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added.

[0035] Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the description.

[0036] In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the following embodiments are not necessarily limited to those illustrated.

[0037] FIG. 1 is a configuration diagram illustrating an ammonia treatment system according to one embodiment of the present invention, and FIG. 2 is a partial configuration diagram illustrating an embodiment of the heating unit of FIG. 1. FIG. 3 is a block diagram illustrating the main configuration of the ammonia treatment system of FIG. 1, and FIG. 4 is a configuration diagram illustrating the supply of ammonia wastewater to the ammonia treatment system of FIG. 1.

[0038] Referring to FIGS. 1 to 3, an ammonia treatment system (1) according to one embodiment of the present invention is installed within the hull of a ship (not shown), and specifically can be installed in an ammonia ship that uses ammonia as a different fuel along with diesel.

[0039] A vessel on which an ammonia treatment system (1) according to one embodiment of the present invention is installed may be a concept that encompasses not only merchant ships that transport cargo from a departure point to a destination, but also marine structures that float at a certain point on the sea and perform specific tasks.

[0040] An ammonia treatment system (1) according to one embodiment of the present invention can effectively remove ammonia wastewater generated from an engine (300) by supplying and burning ammonia wastewater during the combustion process of the engine (300).

[0041] Referring to FIGS. 1 to 3, an ammonia treatment system (1) according to one embodiment of the present invention may include a fuel storage unit (100), a fuel supply unit (200), an engine (300), a fuel treatment unit (400), a hazardous substance treatment unit (500), a fuel recovery unit (600), a wastewater supply unit (700), and a control unit (800).

[0042] A fuel storage unit (100) according to one embodiment of the present invention may be a type of storage facility for storing ammonia in a liquid state, and as an example, a storage tank may be applied, but is not limited thereto and various types of storage facilities may be applied.

[0043] The fuel storage unit (100) may have insulation applied to at least one side, either internally or externally, to store liquid ammonia.

[0044] The fuel storage unit (100) may be provided to form a cargo hold inside the ship, or one or more separate tanks may be provided inside the ship or on the deck.

[0045] The fuel storage unit (100) stores ammonia in a liquid state and can supply the stored liquid ammonia to the engine (300) in a high temperature and high pressure form through the fuel supply unit (200).

[0046] Referring to FIGS. 1 to 3, a fuel supply unit (200) according to one embodiment of the present invention can form a type of supply line that supplies ammonia stored in a fuel storage unit (100) to an engine (300).

[0047] The fuel supply unit (200) may include a low-pressure pump (LP), a heating unit (210), a high-pressure pump (HP), a plurality of supply valves (not shown in the drawing), etc.

[0048] The low-pressure pump (LP) can supply liquid ammonia stored in the fuel storage unit (100) to the heating unit (210) by pressurizing it to a low pressure.

[0049] The low-pressure pump (LP) is disclosed to be connected to an external line of the fuel storage unit (100), but is not limited thereto and may be placed inside the fuel storage unit (100), or may be arranged in series in multiple units to have a multi-stage pressurization structure.

[0050] The heating unit (210) can heat ammonia, which has been pressurized to a low pressure in the low-pressure pump (LP), to a high temperature and supply it to the high-pressure pump (HP).

[0051] Although not described in detail, ammonia pressurized to low pressure in a low-pressure pump (LP) can be supplied to a heating unit (210) after passing through a high-pressure filter to remove impurities.

[0052] The heating unit (210) may include a heater (211) and may circulate a heat medium such as glycol water to adjust the temperature of the heated ammonia to correspond to the required temperature of the engine (300).

[0053] For example, the heating unit (210) may include a glycol water tank (212), a circulation pump (213), a glycol water heat exchanger (214), and a glycol water injection unit (215).

[0054] In detail, the glycol water stored in the glycol water tank (212) is circulated through the circulation pump (213) and can be supplied to the glycol water heat exchanger (214) via the circulation pump (213).

[0055] Glycol water supplied to the glycol water heat exchanger (214) can be heated to a high temperature after heat exchange with steam, etc., and the high-temperature glycol water can be supplied to the heater (211) through the glycol water injection unit (215).

[0056] High-temperature glycol water supplied to the heater (211) can raise the ammonia to a high temperature through heat exchange with ammonia, and the glycol water that has finished heat exchange with ammonia can be recovered into the glycol water tank (212).

[0057] The high-pressure pump (HP) can pressurize low-pressure ammonia heated in the heater (211) to high pressure and supply it to the engine (300) through a plurality of valves.

[0058] Although not described in detail, ammonia pressurized to high pressure in a high-pressure pump (HP) can be supplied to an engine (300) through multiple valves after passing through a high-pressure filter to remove impurities once more.

[0059] Referring to FIGS. 1 to 3, an engine (300) according to one embodiment of the present invention can generate power by receiving liquid ammonia from a fuel storage unit (100) as high-temperature and high-pressure fuel through a fuel supply unit (200).

[0060] At this time, the engine (300) may include an internal combustion engine, and in particular, may be a hybrid fuel engine that generates power using ammonia as fuel or uses diesel as fuel.

[0061] For example, the engine (300) of the present embodiment can obtain rotational driving force by repeatedly moving the piston up and down through a combustion process involving an exothermic reaction of ammonia or diesel fuel with an oxidizer such as compressed air, specifically through a cycle including intake, compression, combustion (expansion), and exhaust strokes.

[0062] Although not described in detail, a fuel injection nozzle connected to a fuel supply unit (200) may be positioned inside the engine (300), and high temperature and high pressure ammonia may be supplied from the fuel supply unit (200) to the inside of the engine (300), specifically to the combustion chamber, through the fuel injection nozzle.

[0063] Additionally, a scavenger receiver (not shown) that stores and supplies air compressed by a turbocharger (not shown) may be placed inside the engine (300), and compressed air required for fuel combustion may be supplied through the scavenger receiver.

[0064] The engine (300) of the present embodiment can compress compressed air supplied from a scavenger by raising the piston, and when the compressed air becomes hot, it can inject fuel through a fuel injection nozzle to lower the piston by the explosive expansion force of the combustion air, and by repeating this process, it can generate rotational driving force by repeatedly raising and lowering the piston.

[0065] Referring to FIGS. 1 to 3, a hazardous substance treatment unit (500) according to one embodiment of the present invention is a device for removing hazardous substances contained in exhaust gas generated during the combustion process of an engine (300).

[0066] Specifically, nitrogen oxides (NOx) are generated in the exhaust gas produced after combustion of the engine (300), and the hazardous substance treatment unit (500) can prevent environmental pollution by removing the nitrogen oxides contained in the exhaust gas and discharging them to the outside.

[0067] At this time, the hazardous substance treatment unit (500) can remove nitrogen oxides contained in the exhaust gas by using an ammonia aqueous solution, such as urea, as a reducing agent for nitrogen oxides to reduce the nitrogen oxides.

[0068] For example, the hazardous substance treatment unit (500) may include a Selective Catalytic Reduction (SCR, 510) and a chimney (520), and exhaust gas from which nitrogen oxides (NOx) have been removed in the Selective Catalytic Reduction (510) may be discharged to the outside through the chimney (520).

[0069] Referring to FIGS. 1 to 3, a fuel recovery unit (600) according to one embodiment of the present invention can recover excess ammonia generated during the combustion process of an engine (300) and separate the recovered excess ammonia into liquid ammonia and gaseous ammonia.

[0070] Liquid ammonia separated from the fuel recovery unit (600) can be supplied to the fuel supply unit (200), and gaseous ammonia can be supplied to the fuel processing unit (400).

[0071] In detail, the fuel recovery unit (600) may include a recovery tank (610), a return cooler (620), and a knock-out drum (630).

[0072] The recovery tank (610) can recover excess ammonia generated from unburned fuel, etc., during the combustion process of the engine (300).

[0073] Excess ammonia recovered in the recovery tank (610) can be separated into liquid ammonia and gaseous ammonia.

[0074] Liquid ammonia separated from the recovery tank (610) can be supplied to the return cooler (620), and gaseous ammonia can be supplied to the fuel processing unit (400).

[0075] The return cooler (620) can cool the liquid ammonia separated from the recovery tank (610) by heat-exchanging it with fresh water (FW), and then supply the cooled liquid ammonia to the fuel supply unit (200), specifically the high-pressure pump (HP).

[0076] Therefore, when the ammonia supplied from the heating unit (210) to the high-pressure pump (HP) is at a relatively high temperature, liquid ammonia cooled through the return cooler (620) is supplied, thereby appropriately lowering the temperature of the ammonia flowing into the high-pressure pump (HP) and allowing the excess ammonia recovered from the engine (300) to be supplied again as fuel.

[0077] The knock-out drum (630) receives excess ammonia supplied from the engine (300) to the recovery tank (610) in case of engine (300) shutdown or emergency, for example, and can separate the supplied excess ammonia into liquid ammonia and gaseous ammonia.

[0078] Liquid ammonia separated from the knock-out drum (630) can be supplied to the recovery tank (610), and gaseous ammonia can be supplied to the fuel processing unit (400).

[0079] Although not described in detail, the liquid ammonia separated from the knock-out drum (630) may be supplied to the fuel storage unit (100) and recovered.

[0080] Referring to FIGS. 1 to 3, a fuel processing unit (400) according to one embodiment of the present invention receives gaseous ammonia through a fuel recovery unit (600) and can dilute the supplied gaseous ammonia to treat wastewater.

[0081] Although not described in detail, the fuel processing unit (400) can directly supply and recover excess ammonia from the engine (300), and the recovered excess ammonia can be diluted for wastewater treatment, or the recovered excess ammonia can be diluted to separate it into gaseous ammonia and liquid ammonia.

[0082] Specifically, the fuel processing unit (400) receives gaseous ammonia from a recovery tank (610) or a knock-out drum (630), and can separate the received gaseous ammonia into diluted liquid ammonia and gaseous ammonia of a concentration below a certain level by diluting it with clean water, etc.

[0083] Although not illustrated in detail, a neutralization tank (not illustrated) may be connected to the fuel processing unit (400), and the fuel processing unit (400) may receive phosphoric acid or sulfuric acid from the neutralization tank to dilute the concentration of ammonia to a lower level.

[0084] At this time, gaseous ammonia diluted to a concentration below a certain level can be selectively discharged to the outside through an exhaust device such as a vent master.

[0085] Referring to FIGS. 3 and 4, a wastewater supply unit (700) according to one embodiment of the present invention can supply ammonia wastewater generated from a fuel processing unit (400) to an engine (300). That is, the wastewater supply unit (700) can supply and burn ammonia wastewater generated from the fuel processing unit (400) during the combustion process of the engine (300).

[0086] Specifically, the wastewater supply unit (700) may include a wastewater supply path (710), a wastewater spray nozzle (720), and a wastewater supply pump (730).

[0087] The wastewater supply path (710) forms a wastewater supply line positioned between the engine (300) and the fuel processing unit (400) to supply ammonia wastewater generated in the fuel processing unit (400) to the engine (300).

[0088] One end of the wastewater supply path (710) may be connected to the interior of the fuel processing unit (400) and the other end may be connected to a wastewater injection nozzle (720) placed inside the engine (300). Accordingly, the ammonia wastewater diluted and generated in the fuel processing unit (400) may flow along the wastewater supply path (710) and be supplied to the interior of the engine (300), specifically the combustion chamber, through the wastewater injection nozzle (720).

[0089] A wastewater injection nozzle (720) is positioned inside the engine (300) and can supply ammonia wastewater flowing through the wastewater supply path (710) to the inside of the engine (300), specifically to the combustion chamber.

[0090] Although not illustrated in detail, the wastewater injection nozzle (720) can inject ammonia wastewater toward the nozzle side of the fuel injection nozzle (not illustrated) that supplies ammonia into the interior of the engine (300).

[0091] That is, the nozzle of the wastewater injection nozzle (720) can be set to spray ammonia wastewater toward the nozzle of the fuel injection nozzle, and accordingly, the nozzle of the fuel injection nozzle can be washed with ammonia wastewater to prevent clogging of the fuel injection nozzle and reduce the flow rate of ammonia wastewater.

[0092] Meanwhile, the wastewater injection nozzle (720) can be replaced with a water injection (not shown) that injects water to lower the combustion chamber temperature of the engine (300) to cool the piston and suppress nitrogen oxides.

[0093] That is, the other end of the wastewater supply path (710) is connected to a water injection instead of a wastewater injection nozzle (720) to inject ammonia wastewater into the interior of the engine (300) through the water injection, and the configuration of the wastewater injection nozzle (720) may be omitted.

[0094] A wastewater supply pump (730) is positioned on the wastewater supply path (710) and can control the flow of ammonia wastewater moving from the fuel processing unit (400) along the wastewater supply path (710).

[0095] At this time, referring to FIGS. 3 and 4, the control unit (800) can control the wastewater supply pump (730) and the wastewater injection nozzle (720) to supply ammonia wastewater into the interior of the engine (300) at a specific time.

[0096] Specifically, the control unit (800) can control the wastewater supply pump (730) and the wastewater injection nozzle (720) so that the wastewater supply unit (700) supplies ammonia wastewater after the ammonia combustion of the engine (300).

[0097] That is, the engine (300) is an internal combustion engine, and just before the piston reaches Top Dead Center (TDC), ammonia fuel can be heated and pressurized to the highest temperature and highest pressure and ignited by an exothermic reaction with compressed air. At this time, the control unit (800) can control the wastewater supply pump (730) and the wastewater injection nozzle (720) to supply ammonia wastewater at the time when the piston reaches Top Dead Center.

[0098] Accordingly, by lowering the maximum temperature relative to the same combustion pressure of the engine (300), harmful substances in the exhaust gas can be reduced, and by raising the combustion pressure relative to the maximum temperature, the performance of the engine (300) can be improved.

[0099] In addition, by reducing harmful substances, namely nitrogen oxides (NOx), in the exhaust gas of the engine (300), the use of urea solution, such as urea, which is used to remove nitrogen oxides in the harmful substance treatment unit (500) can be minimized, and thereby the maintenance cost of the ammonia treatment system (1) can be reduced.

[0100]

[0101] Next, an ammonia treatment system (1') according to another embodiment of the present invention will be described in more detail with reference to the attached drawings.

[0102] FIG. 5 is a configuration diagram illustrating an ammonia treatment system according to another embodiment of the present invention, FIG. 6 is a block diagram illustrating the main configuration of the ammonia treatment system of FIG. 5, and FIG. 7 is a configuration diagram illustrating air supplied to the engine in the ammonia treatment system of FIG. 5 being supplied to the exhaust section.

[0103] Referring to FIGS. 5 to 7, an ammonia treatment system (1') according to another embodiment of the present invention may include a fuel storage unit (100), a fuel supply unit (200), an engine (300), a fuel treatment unit (400), a hazardous substance treatment unit (500), a fuel recovery unit (600), a wastewater supply unit (700), a control unit (800), an exhaust unit (910), and an air supply unit (920, 930, 940).

[0104] Since the ammonia treatment system (1') according to another embodiment of the present invention differs from the ammonia treatment system (1) according to one embodiment of the present invention in that the exhaust section (910) and the air supply section (920) are different, the configuration of the exhaust section (910) and the air supply section (920, 930, 940) will be described in detail below.

[0105] Referring to FIG. 5, the exhaust unit (910) can receive ammonia gas, i.e., gaseous ammonia, from the fuel processing unit (400) and discharge it to the outside.

[0106] At this time, the exhaust unit (910) can receive ammonia gas at a concentration below the exhaustable concentration from the fuel processing unit (400) and then immediately discharge the ammonia gas to the outside, but in this embodiment, the ammonia gas is selectively discharged to the outside according to the concentration of ammonia gas detected by the detection sensor (940) in conjunction with the air supply unit (920, 930, 940) described later.

[0107] Referring to FIGS. 5 to 7, an air supply unit (920, 930, 940) according to one embodiment of the present invention can supply air supplied to the engine (300) to the exhaust unit (910).

[0108] Specifically, the air supply unit (920, 930, 940) may include an air supply path (920), a control valve (930), and a detection sensor (940).

[0109] The air supply path (920) can form a type of air supply line that connects the engine (300) and the exhaust section (910) to supply air flowing into the engine (300) to the exhaust section (910).

[0110] One end of the air supply path (920) can be in communication with the interior of the engine (300), and the other end can be in communication with the interior of the exhaust section (910).

[0111] In detail, the engine (300) may have an internal scavenger receiver (310) that stores and supplies air compressed by a turbocharger (not shown), and may receive compressed air necessary for the combustion of fuel through the scavenger receiver (310).

[0112] Accordingly, one end of the air supply channel (920) is connected to the scavenger receiver (310) and the other end is connected to the interior of the exhaust section (910), so that the compressed air of the scavenger receiver (310) can be supplied to the exhaust section (910) as scavenger along the air supply channel (920).

[0113] Accordingly, air can flow using the excess air pressure within the engine (300) formed by the compressed air of the scavenger (310), and a large amount of additional air can be supplied.

[0114] Referring to FIGS. 5 to 7, a control valve (930) is positioned in an air supply path (920) and can open and close the air supply path (920), and can control the flow of air supplied from the intake receiver (310) to the exhaust section (910).

[0115] At this time, the control valve (930) can open and close the air supply path (920) according to the concentration of ammonia gas in the exhaust section (910) detected by the detection sensor (940).

[0116] That is, the control valve (930) can open the air supply path (920) when the concentration of ammonia gas in the exhaust section (910) detected by the detection sensor (940) is higher than the exhaustable concentration, for example, 10,000 (ppm).

[0117] Accordingly, air is supplied from the intake receiver (310) to the exhaust section (910), and the air supplied to the exhaust section (910) can reduce the concentration of ammonia gas inside the exhaust section (910) as intake air.

[0118] The control valve (930) can supply air from the scavenger (310) to the exhaust section (910) by opening the air supply path (920) until the concentration of ammonia gas inside the exhaust section (910) reaches a concentration below the exhaustable concentration.

[0119] Afterwards, if the concentration of ammonia gas inside the exhaust unit (910) detected by the detection sensor (940) is below the exhaustable concentration, the control valve (930) is shut off, and the exhaust unit (910) can release the ammonia gas to the outside.

[0120] Referring to FIGS. 6 and FIGS. 7, the process of diluting and discharging the concentration of ammonia gas in the exhaust section (910) using air supplied to the engine (300) in an ammonia treatment system (1') according to another embodiment of the present invention is described as follows.

[0121] First, when the engine (300) is in operation, ammonia from the fuel storage unit (100) can be supplied to the engine (300) through the fuel supply unit (200).

[0122] At this time, excess ammonia generated during the combustion process of the engine (300) is separated into liquid and gaseous ammonia through the fuel recovery unit (600), and the separated gaseous ammonia can be supplied to the fuel processing unit (400).

[0123] Gaseous ammonia supplied to the fuel processing unit (400) can be diluted through contact with clean water and separated into diluted liquid ammonia and ammonia gas.

[0124] The ammonia gas diluted and separated in the fuel processing unit (400) can be supplied to the exhaust unit (910).

[0125] At this time, the detection sensor (940) can measure the concentration of ammonia gas in the exhaust unit (910) and transmit it to the control unit (800).

[0126] The control unit (800) can open the exhaust unit (910) to discharge the ammonia gas to the outside when the concentration of ammonia gas received from the detection sensor (940) is below the exhaustable concentration.

[0127] When the concentration of ammonia gas received from the detection sensor (940) exceeds the exhaustable concentration, the control unit (800) closes the exhaust unit (910) and opens the control valve (930) so that air is supplied from the scavenger receiver (310) of the engine (300) to the exhaust unit (910) through the air supply path (920).

[0128] The air supplied to the exhaust section (910) can dilute the ammonia gas in the exhaust section (910) and gradually lower the concentration of the ammonia gas.

[0129] Subsequently, when the concentration of ammonia gas detected by the detection sensor (940) becomes below the exhaustable concentration, the control unit (800) blocks the control valve (930) and opens the exhaust unit (910) to discharge the ammonia gas to the outside.

[0130] Of course, even if the concentration of ammonia gas detected by the detection sensor (940) is below the exhaustable concentration, the control unit (800) can open the control valve (930) to continuously supply air from the intake receiver (310) to the exhaust unit (910), thereby enabling the ammonia gas discharge from the exhaust unit (910) to be performed more quickly and for a longer period.

[0131] An ammonia treatment system (1') according to another embodiment of the present invention can quickly and effectively reduce the concentration of ammonia gas discharged from the exhaust section (910) through a simple structure that supplies air from the intake receiver (310) of the engine (300) to the exhaust section (910), thereby minimizing environmental pollution.

[0132] The ammonia treatment system (1') according to another embodiment of the present invention is identical to the ammonia treatment system (1) according to one embodiment of the present invention in terms of the configuration, operating principle, and effect of the fuel storage unit (100), fuel supply unit (200), engine (300), fuel treatment unit (400), hazardous substance treatment unit (500), fuel recovery unit (600), wastewater supply unit (700), and control unit (800), except for the exhaust unit (910) and air supply unit (920, 930, 940), so a detailed description is omitted in the scope of overlap.

[0133] The scope of the present invention is not limited to the described embodiments, and all scopes equivalent to or equivalently modified from the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention.

[0134] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

[0135] According to the present invention, an ammonia treatment system and a vessel including the same are provided. Furthermore, embodiments of the present invention can be applied to vessels that use industrially utilized ammonia as fuel.

Claims

1. Fuel storage unit for storing ammonia; A fuel supply unit that supplies ammonia from the above fuel storage unit to the engine; Excess ammonia generated from the above engine is recovered, and a fuel treatment unit that treats the recovered excess ammonia as wastewater; and An ammonia treatment system comprising: a wastewater supply unit that supplies ammonia wastewater treated in the fuel treatment unit to the engine.

2. In Paragraph 1, The above engine includes an internal combustion engine, The above wastewater supply unit supplies the ammonia wastewater after the piston top dead center of the internal combustion engine, an ammonia treatment system.

3. In Paragraph 1, The ammonia is injected into the interior of the engine through a fuel injection nozzle, and the ammonia wastewater is injected into the interior of the engine through a wastewater injection nozzle. An ammonia treatment system in which the above wastewater injection nozzle injects the ammonia wastewater toward the injection port side of the above fuel injection nozzle.

4. In Paragraph 1, The above wastewater supply unit is, A wastewater supply path disposed between the fuel treatment unit and the engine; and An ammonia treatment system comprising a wastewater supply pump disposed in the above wastewater supply path.

5. In Paragraph 1, An exhaust unit for discharging ammonia gas generated in the above fuel processing unit to the outside; and An ammonia treatment system comprising: an air supply unit that supplies air supplied to the engine to the exhaust unit.

6. In Paragraph 5, The above air supply unit is, An air supply passage disposed between the above-mentioned engine and the above-mentioned exhaust section; A sensing sensor for detecting the concentration of ammonia gas in the exhaust section; and An ammonia treatment system comprising: a control valve disposed in the air supply path and controlling the flow of air according to the concentration of the ammonia gas detected by the detection sensor.

7. In Paragraph 5, The above exhaust unit discharges the ammonia gas to the outside when the concentration of the ammonia gas in the above exhaust unit is below the exhaustable concentration, and The above air supply unit supplies air when the concentration of ammonia gas in the above exhaust unit exceeds the exhaustable concentration, in an ammonia treatment system.

8. In Paragraph 7, An ammonia treatment system in which the air supply unit supplies air until the concentration of ammonia gas in the exhaust unit reaches a concentration below the exhaustable concentration.

9. In Paragraph 1, An ammonia treatment system further comprising a hazardous substance treatment unit that removes hazardous substances generated during combustion of the above-mentioned engine and discharges them to the outside.

10. Hull; and an ammonia treatment system housed in the above hull; comprising, The above ammonia treatment system is, Fuel storage unit for storing ammonia; A fuel supply unit that supplies ammonia from the above fuel storage unit to the engine; Excess ammonia generated from the above engine is recovered, and a fuel treatment unit that treats the recovered excess ammonia as wastewater; and A vessel comprising: a wastewater supply unit that supplies ammonia wastewater treated in the fuel processing unit to the engine.

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