Ammonia emission system for ship

Abstract

The present invention relates to an ammonia discharge system for a ship capable of safely discharging ammonia leaking from the engine room of an ammonia-propelled ship, comprising: a fuel storage tank for storing ammonia as fuel; a fuel supply line connected between the fuel storage tank and the engine room of the ship and supplying ammonia from the fuel storage tank as fuel to the engine room of the ship; a gas discharge line branched from the fuel supply line upstream of the engine room and discharging air containing ammonia within the engine room; and an absorption tower connected to the gas discharge line, into which air containing ammonia within the engine room flows and which absorbs ammonia in the air introduced into it.

Description

Technology Field

[0001] The present invention relates to an ammonia-fueled vessel, and more specifically, to an ammonia discharge system for a vessel capable of safely treating and discharging ammonia leaked from the engine room. Background Technology

[0003] Generally, ships are propelled using internal combustion engines, such as diesel engines that use heavy oil and light oil produced by refining crude oil as fuel, gas engines that use natural gas as fuel, and dual-fuel engines that use a combination of the two.

[0004] Recently, as environmental regulations by the International Maritime Organization (IMO) have been strengthened, research on eco-friendly fuel ships is actively underway to reduce the amount of carbon dioxide emitted during ship propulsion.

[0005] As part of the growing demand for eco-friendly fuel ships, there is increasing demand for the development of ships and engines utilizing ammonia fuel. Ammonia has a calorific value of 186 MJ / kg, which is 0.44 times that of gasoline. It has superior storability as it liquefies when a certain pressure is applied even at room temperature, similar to LPG. It is also easy to mass-produce using the Haber-Bosch process. Furthermore, it has the advantages of being more economical than hydrogen and having lower technological barriers, as it has a higher energy density per unit volume compared to compressed hydrogen and liquid hydrogen.

[0006] However, because ammonia is a toxic gas, most countries around the world regulate it by establishing concentration standards that are permissible in workplaces and daily life. Furthermore, if ammonia tanks are subjected to stress from gas pressure, the metal structure in the affected areas deteriorates and becomes susceptible to corrosion; if this leads to cracks, gas leakage may occur.

[0007] For this reason, conventional ammonia-propelled vessels performed the task of slowly reducing ammonia concentration in the engine room by circulating outside air through the ventilation system several or dozens of times in the event of an ammonia leak. However, this method of reducing ammonia concentration is very time-consuming, and there is a concern that crew members may be exposed to ammonia released to the outside during ventilation, potentially causing safety issues.

[0009] Prior Art Document 1: Korean Registered Patent No. 10-2608685 (Nov. 28, 2023)

[0010] Prior Art Document 2: Korean Registered Patent No. 10-2651899 (March 22, 2024) The problem to be solved

[0012] The present invention was developed to resolve the aforementioned problems and aims to provide an ammonia discharge system for a ship capable of safely treating and discharging ammonia leaking from the engine room of an ammonia-propelled vessel.

[0013] In addition, the present invention aims to provide an ammonia exhaust system for a ship that can safely treat and discharge ammonia fuel remaining in the engine and piping when converting ammonia fuel to diesel or LNG fuel. means of solving the problem

[0015] To achieve the aforementioned objective, an ammonia exhaust system for a ship according to one embodiment of the present invention comprises: a fuel storage tank for storing ammonia as fuel; a fuel supply line connected between the fuel storage tank and the engine room of the ship and supplying ammonia from the fuel storage tank as fuel to the engine room of the ship; a gas exhaust line branched from the fuel supply line upstream of the engine room and exhausting air containing ammonia within the engine room; and an absorption tower connected to the gas exhaust line, into which air containing ammonia within the engine room flows and which absorbs ammonia in the air introduced into it.

[0016] Preferably, an ammonia exhaust system of a ship according to one embodiment of the present invention further includes a first ammonia measuring sensor installed in the engine room and measuring the ammonia gas concentration in the engine room. Additionally, a blower is installed in the gas exhaust line to transport air in the engine room to the absorption tower, and when the measured value of the first ammonia measuring sensor is greater than or equal to a preset value, the operation of the blower is controlled so that air containing ammonia in the engine room is transported to the absorption tower through the gas exhaust line.

[0017] Preferably, an ammonia discharge system of a ship according to one embodiment of the present invention further comprises: a fresh water storage tank; a fresh water supply line connected between the fresh water storage tank and the upper part of the absorption tower and supplying fresh water to the upper part of the absorption tower; and an ammonia water discharge line connected to the downstream side of the absorption tower and discharging ammonia water in which ammonia gas has been absorbed within the absorption tower, wherein the gas discharge line supplies air containing ammonia to the lower part of the absorption tower, and the fresh water supply line sprays fresh water onto the upper part of the absorption tower so that the ammonia gas supplied to the lower part of the absorption tower is absorbed by the fresh water to generate ammonia water.

[0018] More preferably, an ammonia gas outlet is provided at the top of the absorption tower for discharging ammonia gas remaining after being absorbed by the clean water, and a second ammonia measuring sensor for measuring ammonia concentration is installed at the ammonia gas outlet, and when the measured value of the second ammonia measuring sensor is greater than or equal to a preset value, the operation of a clean water supply pump installed in the clean water supply line is controlled to control the amount of clean water sprayed into the absorption tower.

[0019] An ammonia discharge system for a ship according to another embodiment of the present invention comprises: a fuel storage tank for storing ammonia and diesel or LNG as fuel; a fuel supply line connected between the fuel storage tank and the engine room of the ship and supplying the fuel stored in the fuel storage tank as fuel to the engine room of the ship; an ammonia fuel discharge line for discharging ammonia fuel remaining in the engine room; an inert gas storage tank for storing inert gas; an inert gas supply line connected between the inert gas storage tank and the ammonia fuel discharge line and purging the ammonia fuel by supplying inert gas from the inert gas storage tank to the ammonia fuel discharge line; and an absorption tower connected to the ammonia fuel discharge line, into which the ammonia gas purged by the inert gas supply line flows and which absorbs the ammonia gas introduced into the interior.

[0020] Preferably, an ammonia discharge system of a ship according to another embodiment of the present invention further comprises: a fresh water storage tank; a fresh water supply line connected between the fresh water storage tank and the upper part of the absorption tower and supplying fresh water to the upper part of the absorption tower; and an ammonia water discharge line connected to the downstream side of the absorption tower and discharging ammonia water in which ammonia gas has been absorbed within the absorption tower, wherein the ammonia fuel discharge line supplies purged ammonia gas to the lower part of the absorption tower, and the fresh water supply line sprays fresh water onto the upper part of the absorption tower so that the ammonia gas supplied to the lower part of the absorption tower is absorbed by the fresh water to generate ammonia water.

[0021] More preferably, an ammonia gas outlet is provided at the top of the absorption tower for discharging ammonia gas remaining after being absorbed by the clean water, and a second ammonia measuring sensor for measuring ammonia concentration is installed at the ammonia gas outlet, and when the measured value of the second ammonia measuring sensor is greater than or equal to a preset value, the operation of a clean water supply pump installed in the clean water supply line is controlled to control the amount of clean water sprayed into the absorption tower.

[0022] Preferably, an ammonia exhaust system of a ship according to another embodiment of the present invention comprises: a gas exhaust line having one end connected to the fuel supply line upstream of the engine room and the other end connected to the lower part of the absorption tower to discharge air in the engine room to the absorption tower; and further comprising a first ammonia measuring sensor installed in the engine room and measuring the ammonia gas concentration in the engine room, wherein a blower is installed in the gas exhaust line to transport air in the engine room to the absorption tower, and when the measured value of the first ammonia measuring sensor is greater than or equal to a preset value, the operation of the blower is controlled so that air containing ammonia in the engine room is transported to the absorption tower through the gas exhaust line.

[0023] More preferably, the ammonia fuel discharge line and the gas discharge line are integrated into a single pipe on the upstream side of the absorption tower, and when the measured value of the first ammonia measuring sensor or the measured value of the second ammonia measuring sensor is greater than or equal to another preset value, the operation of the pump installed in the inert gas supply line is controlled so that the inert gas of the inert gas storage tank is supplied to the gas discharge line. Effects of the invention

[0025] According to the present invention, when ammonia leaks in the engine room, a blower is operated to quickly transfer the leaked ammonia gas to an absorption tower, and the transferred ammonia gas is absorbed by fresh water and safely discharged outside the absorption tower.

[0026] In addition, according to the present invention, when converting ship fuel from ammonia to diesel or LNG, the remaining ammonia fuel in the engine and piping of the engine room can be rapidly purged, and the purged ammonia can be safely treated and discharged through an absorption tower. Brief explanation of the drawing

[0028] FIG. 1 is a schematic diagram illustrating the configuration of an ammonia discharge system of a ship according to one embodiment of the present invention. FIG. 2 is a schematic diagram illustrating the configuration of an ammonia discharge system of a ship according to another embodiment of the present invention. FIG. 3 is a schematic diagram illustrating the configuration of an ammonia discharge system of a ship according to another embodiment of the present invention. Specific details for implementing the invention

[0029] Hereinafter, a preferred embodiment of an ammonia exhaust system for a ship according to the present invention will be described with reference to the attached drawings. For reference, in the description of the present invention below, terms referring to the components of the present invention are named considering the functions of each component, and should not be understood as limiting the technical components of the present invention.

[0031] Referring to FIG. 1, an ammonia discharge system for a ship according to one embodiment of the present invention is a system capable of safely treating and discharging ammonia gas leaking from the engine room of an ammonia fuel-propelled ship, and comprises a fuel storage tank (110) in which ammonia is stored, a fuel supply line (120) that supplies fuel from the fuel storage tank (110) to the engine room (100) of the ship, a gas discharge line (130) that discharges leaked gas generated in the engine room (100) to the outside of the engine room (100), and an absorption tower (140) that absorbs harmful gas contained in the air discharged through the gas discharge line (130).

[0032] The fuel storage tank (110) stores ammonia as a ship propulsion fuel. The fuel supply line (120) is connected between the fuel storage tank (110) and the ship's engine room (100) and supplies the ammonia from the fuel storage tank (110) to the ship's engine room (100) as fuel. The gas discharge line (130) branches off from the fuel supply line (120) upstream of the engine room (100) and discharges air containing ammonia leaked from within the engine room (100) to the outside of the engine room (100). The absorption tower (140) is connected to the gas discharge line (130), and air containing ammonia from within the engine room (100) flows into it. Ammonia, which is a harmful gas in the air flowing into the absorption tower (140), is absorbed inside the absorption tower (140).

[0033] Preferably, an ammonia exhaust system of a ship according to one embodiment of the present invention is configured to detect an ammonia gas leak within an engine room (100) and, based on the detection result, to transfer the leaked gas to an absorption tower (140) through a gas exhaust line (130). Specifically, a first ammonia measuring sensor (not shown) for measuring the ammonia gas concentration within the engine room (100) is installed within the engine room (100). Additionally, a blower (131) for transferring air within the engine room (100) to an absorption tower (140) is installed in the gas exhaust line (130). When the measurement value of the first ammonia measuring sensor is greater than or equal to a preset value, it is determined that ammonia has leaked within the engine room (100), and the operation of the blower (131) is controlled, and the air containing ammonia within the engine room (100) is transferred to an absorption tower (140) through the gas exhaust line (130) by the operation of the blower (131).

[0034] Preferably, the absorption tower (140) is configured to absorb and remove ammonia gas by bringing the ammonia gas introduced into it into contact with the absorption liquid. To this end, the ammonia discharge system of a ship according to one embodiment of the present invention further includes a fresh water storage tank (151) and a fresh water supply line (150) connected between the fresh water storage tank (151) and the absorption tower (140). The fresh water storage tank (151) stores fresh water for ammonia absorption inside. The fresh water supply line (150) serves to supply fresh water from the fresh water storage tank (151) into the absorption tower using a fresh water supply pump (152). Here, the fresh water supply line (150) is connected to the upper part of the absorption tower (140) and may be equipped with a spray nozzle (153) that sprays fresh water from the upper part of the absorption tower (140) to the lower part. Ammonia water is produced by the ammonia gas supplied to the lower part of the absorption tower (140) being absorbed by the fresh water sprayed through this spray nozzle (153).

[0035] Additionally, the gas discharge line (130) is connected to the lower part of the absorption tower (140), so that air containing ammonia is supplied to the lower part of the absorption tower (140), and the ammonia gas is transported from the lower part of the absorption tower (140) to the upper part. Furthermore, an ammonia water discharge line (160) is connected to the downstream side of the absorption tower (140) to discharge ammonia water in which ammonia gas has been absorbed within the absorption tower (140), and an ammonia water storage tank (161) for storing ammonia water is installed downstream of this ammonia water discharge line (160).

[0036] Preferably, an ammonia gas outlet (141) is provided at the top of the absorption tower (140) to discharge the ammonia gas remaining after being absorbed by the fresh water. Additionally, a second ammonia measuring sensor (not shown) is installed at the ammonia gas outlet (141) to measure the concentration of the discharged ammonia gas. When the measured value of the second ammonia measuring sensor is greater than or equal to a preset value, the operation of the fresh water supply pump (152) installed in the fresh water supply line (150) is controlled. Then, by controlling the operation of the fresh water supply pump (152), the amount of fresh water injected into the absorption tower (140) from the fresh water storage tank (151) is controlled, thereby allowing the concentration of the ammonia gas discharged outside the absorption tower (140) through the ammonia gas outlet (141) to be adjusted to a safe range.

[0037] In this way, the ammonia discharge system of a ship according to one embodiment of the present invention is intended to safely discharge ammonia gas leaking from the engine room of a ship propelled by ammonia fuel. When a first ammonia measuring sensor detects an ammonia gas leak inside the engine room (100), a blower (131) operates to transfer the leaked ammonia gas to an absorption tower (140). The transferred ammonia gas is absorbed by fresh water sprayed inside the absorption tower (140) and discharged in the form of ammonia water, and the low-concentration ammonia gas remaining that is not absorbed by the fresh water is discharged out of the absorption tower (140) through an ammonia gas discharge port (141). Accordingly, the ammonia discharge system of a ship according to one embodiment of the present invention can quickly and safely process and discharge ammonia gas when an ammonia leak occurs in the engine room (100) of a ship.

[0039] Referring to FIG. 2, an ammonia exhaust system for a ship according to another embodiment of the present invention is illustrated, which can selectively use ammonia, diesel, or LNG as ship fuel.

[0040] Specifically, the ammonia discharge system of a ship illustrated in FIG. 2 discloses a system for safely discharging ammonia fuel remaining in the engine and piping of the engine room (100) by purging it when, after using ammonia as fuel, diesel or LNG is to be used as fuel as needed. This ammonia discharge system includes a fuel storage tank (110) in which ammonia and diesel or LNG are stored, a fuel supply line (120) that supplies fuel from the fuel storage tank (110) to the engine room (100) of the ship, an ammonia fuel discharge line (170) that discharges ammonia fuel remaining in the engine room (100), an inert gas storage tank (181) that stores an inert gas such as nitrogen, an inert gas supply line (180) that purges the ammonia from the ammonia fuel discharge line (170), and an absorption tower (140) that absorbs the ammonia gas transferred from the ammonia fuel discharge line (170).

[0041] The fuel storage tank (110) has partitioned spaces in which ammonia, diesel, or LNG fuel is stored, respectively. The fuel supply line (120) is connected between the fuel storage tank (110) and the engine room (100) of the ship and supplies the fuel stored in the fuel storage tank (110) to the engine room (100) of the ship as fuel. Here, the fuel supply line (120) is configured to selectively supply ammonia, diesel, or LNG to the engine room (100). The ammonia fuel discharge line (170) is for discharging ammonia fuel remaining in the engine room (100) and the piping around the engine room to the outside of the engine room, and is equipped with a suction pump (not shown) on the upstream side and connected to an absorption tower (140) on the downstream side. The inert gas storage tank (181) stores an inert gas, such as nitrogen, for purging the ammonia fuel of the ammonia fuel discharge line (170). The inert gas supply line (180) is connected between the inert gas storage tank (181) and the ammonia fuel discharge line (170), and the inert gas from the inert gas storage tank (181) is supplied to the ammonia fuel discharge line (170) using a gas supply pump (182) or a blower to purge the ammonia fuel being transferred to the absorption tower (140) through the ammonia fuel discharge line (170). The absorption tower (140) is connected to the ammonia fuel discharge line (170), and the ammonia gas purged by the inert gas supply line (180) flows into the absorption tower (140). The ammonia gas flowing into the absorption tower (140) is absorbed inside the absorption tower (140).

[0042] Similar to the embodiment illustrated in FIG. 1, the absorption tower (140) illustrated in FIG. 2 is configured to absorb and remove ammonia gas introduced into the interior by contacting it with an absorption liquid. To this end, the ammonia discharge system of a ship according to another embodiment of the present invention illustrated in FIG. 2 further includes a fresh water storage tank (151) and a fresh water supply line (150) connected between the fresh water storage tank (151) and the absorption tower (140). The fresh water storage tank (151) stores fresh water for ammonia absorption inside. The fresh water supply line (150) serves to supply fresh water from the fresh water storage tank (151) into the absorption tower. Here, the fresh water supply line (150) may be connected to the upper part of the absorption tower (140) and may be equipped with a spray nozzle (153) that sprays fresh water from the upper part of the absorption tower (140) to the lower part. Ammonia water is produced by the ammonia gas supplied to the lower part of the absorption tower (140) being absorbed by the clean water sprayed through this spray nozzle (153).

[0043] Additionally, an ammonia fuel discharge line (170) is connected to the lower part of the absorption tower (140), so that purged ammonia gas is supplied to the lower part of the absorption tower (140), and this ammonia gas is transported from the lower part of the absorption tower (140) to the upper part. Additionally, an ammonia water discharge line (160) is connected to the downstream side of the absorption tower (140) to discharge ammonia water in which ammonia gas has been absorbed within the absorption tower (140), and an ammonia water storage tank (161) for storing ammonia water is installed downstream of this ammonia water discharge line (160).

[0044] Preferably, an ammonia gas outlet (141) is provided at the top of the absorption tower (140) to discharge the ammonia gas remaining after being absorbed by the fresh water. Additionally, a second ammonia measuring sensor (not shown) is installed at the ammonia gas outlet (141) to measure the concentration of the discharged ammonia gas. When the measured value of the second ammonia measuring sensor is greater than or equal to a preset value, the operation of the fresh water supply pump (152) installed in the fresh water supply line (150) is controlled. Then, by controlling the operation of the fresh water supply pump (152), the amount of fresh water injected into the absorption tower (140) from the fresh water storage tank (151) is controlled, thereby allowing the concentration of the ammonia gas discharged outside the absorption tower (140) through the ammonia gas outlet (141) to be adjusted to a safe range.

[0045] In this way, according to another embodiment of the present invention, when it is necessary to use diesel or LNG fuel after using ammonia fuel, the ammonia discharge system of a ship can purge ammonia by operating the gas supply pump (152) of the inert gas supply line (150) to supply inert gas to the ammonia fuel discharge line (170), and the purged ammonia can be transferred to the absorption tower (140) to absorb the ammonia gas. Then, the low-concentration ammonia gas remaining unabsorbed in the absorption tower (140) is discharged outside the absorption tower (140) through the gas outlet (141), and the ammonia water absorbed by the fresh water is discharged to the ammonia water storage tank (161) through the ammonia water discharge line (160). Therefore, when converting the ship fuel from ammonia to diesel or LNG, the ammonia fuel remaining in the engine and piping of the engine room (100) can be quickly purged, and the purged ammonia can be safely processed and discharged through the absorption tower (130).

[0047] Referring to FIG. 3, a ship ammonia discharge system according to another embodiment of the present invention may be configured to include both a configuration for treating and discharging ammonia gas leaked from the engine room (100) of a ship and a configuration for purging and safely discharging ammonia fuel remaining in the engine room (100) of a ship.

[0048] Specifically, the ammonia discharge system of the ship illustrated in FIG. 3 includes the aforementioned fuel storage tank (110), fuel supply line (120), gas discharge line (130), ammonia fuel discharge line (170), inert gas storage tank (181), inert gas supply line (180), and absorption tower (140), and the configuration and function of each of these refer to the description based on FIG. 1 and 2.

[0049] Additionally, a first ammonia measuring sensor (not shown) for measuring the concentration of ammonia gas in the engine room (100) is installed in the engine room (100), and a second ammonia measuring sensor (not shown) for measuring the concentration of ammonia gas discharged is installed at the ammonia gas outlet (141) of the absorption tower (140).

[0050] With this configuration, the ship ammonia discharge system according to the present invention, when the first ammonia measuring sensor detects an ammonia gas leak inside the engine room (100), the blower (131) operates to transfer the ammonia gas leaked from the engine room (100) to the absorption tower (140) through the gas discharge line (130). The transferred ammonia gas is absorbed by fresh water sprayed inside the absorption tower (140) and converted into ammonia water, which is then discharged to the ammonia water storage tank (161). The low-concentration ammonia gas remaining that is not absorbed by the fresh water is discharged out of the absorption tower (140) through the ammonia gas discharge port (141). Therefore, in the event of an ammonia leak in the engine room (100) of a ship, the ammonia gas can be processed and discharged quickly and safely.

[0051] In addition, the ship ammonia discharge system according to the present invention can purge ammonia by operating a gas supply pump (182) or a blower of an inert gas supply line (180) to supply inert gas to an ammonia fuel discharge line (170) when it is necessary to use diesel or LNG fuel while using ammonia fuel for ship propulsion, and can absorb ammonia gas by transferring the purged ammonia to an absorption tower (140). Then, low-concentration ammonia gas remaining unabsorbed in the absorption tower (140) is discharged to the outside through a gas outlet (141), and ammonia water absorbed by fresh water is discharged to an ammonia water storage tank (161). Thus, when switching ship fuel from ammonia to diesel or LNG, the ammonia fuel in the engine and piping of the engine room (100) can be quickly purged, and the purged ammonia can be safely processed and discharged through the absorption tower (140).

[0052] Preferably, the ammonia fuel discharge line (170) and the gas discharge line (130) can be integrated into a single pipe upstream of the absorption tower (140). And, when the measurement value of the first ammonia measurement sensor or the measurement value of the second ammonia measurement sensor is greater than or equal to another preset value, the operation of the gas supply pump (182) or blower installed in the inert gas supply line (180) can be controlled to more effectively lower the concentration of the discharged ammonia gas so that the inert gas from the inert gas storage tank (181) is supplied to the gas discharge line (130).

[0054] The embodiments of the present invention described above are merely illustrative of the technical concept of the present invention, and the scope of protection of the present invention should be interpreted by the following claims. Furthermore, as those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention, all technical concepts within the scope equivalent to the present invention should be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0056] 100: Engine bay 110: Fuel storage tank 120: Fuel supply line 130: Gas exhaust line 131: Blower 140: Absorption Tower 141: Gas outlet 150: Fresh water supply line 151: Freshwater storage tank 152: Freshwater supply pump 153: Spray nozzle 160: Ammonia water discharge line 161: Ammonia water storage tank 170: Ammonia fuel exhaust line 180: Inert gas supply line 181: Inert gas storage tank 182: Gas supply pump or blower

Claims

Claim 1 An ammonia exhaust system for a ship, comprising: a fuel storage tank for storing ammonia as fuel; a fuel supply line connected between the fuel storage tank and the engine room of the ship and supplying ammonia from the fuel storage tank as fuel to the engine room of the ship; a gas exhaust line branched from the fuel supply line and discharging air containing ammonia in the engine room; and an absorption tower connected to the gas exhaust line, into which air containing ammonia in the engine room is introduced and which absorbs ammonia in the air introduced into it. Claim 2 An ammonia exhaust system for a ship according to claim 1, further comprising a first ammonia measuring sensor installed in the engine room and measuring the ammonia gas concentration in the engine room, wherein a blower is installed in the gas exhaust line to transport air in the engine room to the absorption tower, and wherein, when the measured value of the first ammonia measuring sensor is greater than or equal to a preset value, the operation of the blower is controlled so that air containing ammonia in the engine room is transported to the absorption tower through the gas exhaust line. Claim 3 An ammonia discharge system for a ship according to claim 1, further comprising: a fresh water storage tank; a fresh water supply line connected between the fresh water storage tank and the upper part of the absorption tower and supplying fresh water to the upper part of the absorption tower; and an ammonia water discharge line connected to the downstream side of the absorption tower and discharging ammonia water in which ammonia gas has been absorbed within the absorption tower, wherein the gas discharge line supplies air containing ammonia to the lower part of the absorption tower, and the fresh water supply line sprays fresh water onto the upper part of the absorption tower so that the ammonia gas supplied to the lower part of the absorption tower is absorbed by the fresh water to generate ammonia water. Claim 4 An ammonia discharge system for a ship according to claim 3, wherein an ammonia gas discharge port is provided at the top of the absorption tower for discharging ammonia gas remaining after being absorbed by fresh water, a second ammonia measuring sensor for measuring ammonia concentration is installed at the ammonia gas discharge port, and when the measured value of the second ammonia measuring sensor is greater than or equal to a preset value, the operation of a fresh water supply pump installed in the fresh water supply line is controlled to control the amount of fresh water sprayed into the absorption tower. Claim 5 An ammonia discharge system for a ship, comprising: a fuel storage tank for storing ammonia and diesel or LNG as fuel; a fuel supply line connected between the fuel storage tank and the engine room of the ship and supplying the fuel stored in the fuel storage tank as fuel to the engine room of the ship; an ammonia fuel discharge line for discharging ammonia fuel remaining in the engine room; an inert gas storage tank for storing inert gas; an inert gas supply line connected between the inert gas storage tank and the ammonia fuel discharge line and supplying inert gas from the inert gas storage tank to the ammonia fuel discharge line to purge the ammonia fuel; and an absorption tower connected to the ammonia fuel discharge line, into which the ammonia gas purged by the inert gas supply line flows and which absorbs the ammonia gas introduced into the interior. Claim 6 An ammonia discharge system for a ship according to claim 5, further comprising: a fresh water storage tank; a fresh water supply line connected between the fresh water storage tank and the upper part of the absorption tower and supplying fresh water to the upper part of the absorption tower; and an ammonia water discharge line connected to the downstream side of the absorption tower and discharging ammonia water in which ammonia gas has been absorbed within the absorption tower, wherein the ammonia fuel discharge line supplies purged ammonia gas to the lower part of the absorption tower, and the fresh water supply line sprays fresh water onto the upper part of the absorption tower so that the ammonia gas supplied to the lower part of the absorption tower is absorbed by the fresh water to generate ammonia water. Claim 7 An ammonia discharge system for a ship according to claim 6, wherein an ammonia gas discharge port is provided at the top of the absorption tower for discharging ammonia gas remaining after being absorbed by fresh water, a second ammonia measuring sensor for measuring ammonia concentration is installed at the ammonia gas discharge port, and when the measured value of the second ammonia measuring sensor is greater than or equal to a preset value, the operation of a fresh water supply pump installed in the fresh water supply line is controlled to control the amount of fresh water sprayed into the absorption tower. Claim 8 An ammonia exhaust system for a ship according to claim 7, comprising: a gas exhaust line having one end connected to the fuel supply line on the upstream side of the engine room and the other end connected to the lower part of the absorption tower to discharge air within the engine room to the absorption tower; and further comprising a first ammonia measuring sensor installed within the engine room and measuring the ammonia gas concentration within the engine room, wherein a blower is installed in the gas exhaust line to transport air within the engine room to the absorption tower, and when the measured value of the first ammonia measuring sensor is greater than or equal to a preset value, the operation of the blower is controlled so that air containing ammonia within the engine room is transported to the absorption tower through the gas exhaust line. Claim 9 An ammonia discharge system for a ship according to claim 8, wherein the ammonia fuel discharge line and the gas discharge line are integrated into a single pipe upstream of the absorption tower, and when the measured value of the first ammonia measuring sensor or the measured value of the second ammonia measuring sensor is greater than or equal to another preset value, the operation of a pump installed in the inert gas supply line is controlled so that the inert gas of the inert gas storage tank is supplied to the gas discharge line.

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