KR20230083973A - ammonia treatment system and ship having the same - Google Patents

Abstract

The present invention relates to an ammonia treatment system and a vessel including the same and, more specifically, to an ammonia treatment system guaranteeing stable and highly reliable fuel supply and efficient exhaust treatment and a vessel including the same. The ammonia treatment system includes: a fuel supply unit supplying ammonia discharged from an ammonia storage tank to an engine; a fuel collection unit collecting residual ammonia returned from the engine; an exhaust treatment unit treating exhaust discharged from the engine; a vent unit discharging the ammonia discharged by the fuel supply unit or the fuel collection unit to the outside; a purging unit purging the fuel supply unit or the fuel collection unit by using non-explosive gas; and a drain treating unit collecting the ammonia drained from the fuel supply unit in the ammonia storage tank. The drain treating unit collects the ammonia to the ammonia storage tank by using the non-explosive gas of the purging unit as a driving source.

Description

Ammonia treatment system and ship including the same {ammonia treatment system and ship having the same}

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

Air pollution is becoming serious all over the world, and climate change is occurring due to air pollution. Since pollutants emitted from ships have a significant impact on air pollution, the International Maritime Organization (IMO), the European Union, and the United States are strengthening regulations on pollutants discharged from ships to reduce air pollution. there is.

In the future, as regulations on greenhouse gas emissions from ships are strengthened step by step at each major starting point by 2050, it is expected that it will be difficult to comply with regulations on pollutants with only existing engines and fuels.

Therefore, it is expected that it will be difficult to use existing fossil fuels as the stricter greenhouse gas emission regulations are applied, and it is very urgent to find alternative fuels that can satisfy the regulations to be strengthened in the future. As an alternative fuel, non-fossil fuels such as ammonia (NH3), biofuel, solar energy, and wind energy are being considered.

Among them, ammonia is a chemical that can be produced, stored, transported, and supplied, and ammonia ships using ammonia as fuel are being developed.

Existing ammonia ships store ammonia fuel as a liquid. Since ammonia has a boiling point lower than room temperature (atmospheric pressure, -33 ° C), the ammonia storage tank must also have certain specifications in order to store ammonia as a liquid. In addition, since the inside of the tank must be kept at a low temperature in order to maintain ammonia in a liquid state, the storage tank must be cooled and a lot of energy is consumed in the cooling process.

In addition, the liquid ammonia storage tank may generate evaporation gas in the tank, and the pressure inside the storage tank increases due to the evaporation gas, so there is a risk of the tank exploding, and an explosion occurs when liquid ammonia leaks out of the tank. It can happen, and there is a risk of human injury due to the toxicity of ammonia.

In this way, existing ammonia ships have limitations in that efficiency is reduced in terms of facility cost and operating cost, and safety of the facility is also reduced in storing liquid ammonia fuel and supplying ammonia fuel to the engine.

The present invention was created to solve the problems of the prior art as described above, and provides an ammonia treatment system that guarantees stable and reliable fuel supply and efficient exhaust treatment in supplying ammonia as fuel to an engine and a ship including the same It is to do.

An ammonia treatment system according to an aspect of the present invention includes a fuel supply unit supplying ammonia discharged from an ammonia storage tank to an engine; a fuel recovery unit that recovers excess ammonia returned from the engine; an exhaust processing unit that processes exhaust exhaust from the engine; a vent unit discharging ammonia discharged from the fuel supply unit or the fuel recovery unit to the outside; a purging unit purging the fuel supply unit or the fuel recovery unit using a non-explosive gas; and a drain processing unit for recovering ammonia drained from the fuel supply unit to the ammonia storage tank, wherein the drain processing unit recovers ammonia to the ammonia storage tank using the non-explosive gas of the purging unit as a driving source.

Specifically, the drain processing unit may include a drain drum for collecting ammonia drained from the fuel supply unit; and a drain pump transferring ammonia from the drain drum to the ammonia storage tank, and the drain pump can be operated by using a non-explosive gas as a driving source.

Specifically, the drain drum collects non-explosive gas and ammonia during purging of the fuel supply unit by the purging unit, a liquid sensor is provided, and the drain pump is operated when the liquid sensor detects liquid. can

Specifically, the drain processing unit may further include a drain valve provided in parallel with the drain pump and opened according to internal pressure of the drain drum to transfer ammonia from the drain drum to the ammonia storage tank.

A vessel according to one aspect of the present invention includes the ammonia treatment system.

The ammonia treatment system according to the present invention and a ship including the same can efficiently supply ammonia to an ammonia engine and exhibit excellent performance in venting, purging, exhaust treatment, and the like.

1 is a conceptual diagram of an ammonia treatment system according to a first embodiment of the present invention.
2 is a conceptual diagram of an ammonia treatment system according to a first embodiment of the present invention.
3 is a conceptual diagram of an ammonia treatment system according to a first embodiment of the present invention.
4 is a conceptual diagram of an ammonia treatment system according to a first embodiment of the present invention.
5 is a conceptual diagram of an ammonia treatment system according to a second embodiment of the present invention.
6 is a conceptual diagram of an ammonia treatment system according to a third embodiment of the present invention.
7 is a conceptual diagram of an ammonia treatment system according to a fourth embodiment of the present invention.
8 is a conceptual diagram of an ammonia treatment system according to a fifth embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

The present invention includes a vessel equipped with an ammonia treatment system described below. At this time, the ship is a concept that includes all ammonia carriers, merchant ships that carry non-ammonia cargoes or people, FSRUs, FPSOs, bunkering vessels, and offshore plants.

Although not shown in the drawings of the present invention, the pressure sensor (PT), the temperature sensor (TT), the flow sensor (FT), etc. may be provided at appropriate positions without limitation, and the measured values by each sensor are described below. It can be used in various ways without limitation to the operation of the described components.

In addition, straight lines in the drawings of the present invention represent passages through which various fluids such as ammonia, heat, and non-explosive gases move, and can be interpreted as pipelines.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 are conceptual diagrams of an ammonia treatment system according to a first embodiment of the present invention.

1 to 4, the ammonia treatment system 1 according to the first embodiment of the present invention includes an ammonia storage tank 10, a fuel supply unit 20, a fuel recovery unit, an exhaust treatment unit 40, a vent It includes a unit 50, a re-liquefying unit 60, a drain processing unit 70, and a purging unit 80.

The ammonia storage tank 10 stores ammonia. Ammonia is used as a fuel consumed by the engine E, and in this case, the engine E may be an ammonia-only engine E or an ammonia combined combustion engine E. Of course, in this specification, the engine E is an engine that obtains energy by consuming ammonia, and is interpreted as encompassing a turbine and the like.

The ammonia storage tank 10 stores ammonia in a liquid state, and for this purpose, insulation may be applied to at least one side of the inside or outside of the ammonia storage tank 10 . Alternatively, the ammonia storage tank 10 may prevent liquefaction of ammonia by storing ammonia at a high pressure, and in this case, the low pressure pump 21 of the fuel supply unit 20 to be described later may be reduced or omitted.

The ammonia storage tank 10 may be provided to form a cargo hold inside the ship, or may be a fuel tank separately provided inside the ship or on the deck. One or more ammonia storage tanks 10 are provided, and when a plurality of ammonia storage tanks 10 are provided, ammonia may be consumed alternatively or simultaneously.

A bunkering unit 11 is connected to the ammonia storage tank 10. The bunkering unit 11 delivers ammonia from an external fueling source to the ammonia storage tank 10. The external fueling source may be an ammonia supply source on land or an ammonia bunkering ship on the sea.

The bunkering unit 11 may connect the ammonia storage tank 10 and the fueling source using a manifold, loading arm, etc., and the fueling source delivers ammonia to the ammonia storage tank 10 at a certain pressure. However, as ammonia evaporates in the ammonia storage tank 10, evaporation gas may be generated, and this causes the internal pressure of the ammonia storage tank 10 to rise, so that the pressure of the ammonia storage tank 10 is higher than that of the fuel source. .

At this time, a lot of load is consumed by the fueling agent in loading ammonia into the ammonia storage tank 10, and the bunkering unit 11 may use a bunkering compressor (not shown) to solve this situation. The bunkering compressor compresses the boil-off gas generated in the ammonia storage tank 10 and delivers it to the filling station to increase the pressure of the filling station to secure a differential pressure between the filling source and the ammonia storage tank 10. Through this, the bunkering unit 11 can ensure that ammonia is smoothly supplied from the gas station to the ammonia storage tank 10.

Of course, the bunkering compressor may use the boil-off gas generated in the fuel source in addition to the boil-off gas of the ammonia storage tank 10. Alternatively, the bunkering compressor may increase the pressure of the fueling source by using a gas other than ammonia. However, in this case, the fueling source may have a structure in which only ammonia is delivered to the ammonia storage tank 10.

A pressure regulator 12 may be provided in the ammonia storage tank 10 . The pressure control unit 12 heats or vaporizes ammonia discharged from the ammonia storage tank 10 and then injects it into the ammonia storage tank 10 to increase the internal pressure of the ammonia storage tank 10 (Pressure Build-up Unit). ), or a subcooler that cools/subcools and returns ammonia.

In addition, the pressure control unit 12 may be the re-liquefaction unit 60, and the pressure control unit 12 may increase or decrease the internal pressure of the ammonia storage tank 10 to ensure stability of ammonia fuel supply.

The fuel supply unit 20 supplies ammonia from the ammonia storage tank 10 to the engine E. The fuel supply unit 20 may supply liquid ammonia from among ammonia stored in the ammonia storage tank 10 to the engine E. In particular, in consideration of the specifications of the engine E currently consuming ammonia, the fuel supply unit 20 is provided to supply ammonia to the engine E in liquid form. Of course, the fuel supply unit 20 may adjust the state of ammonia in various ways in response to changes in engine E specifications.

The fuel supply unit 20 may be divided into a low pressure part and a high pressure part, and the low pressure part and the high pressure part may be configured as a skid. In addition, the skid (LP Skid) provided with the low-pressure part and the skid (HP Skid) provided with the high-pressure part may be provided separately and may have a mutually connectable structure.

In the case of the low pressure skid (LP Skid), an ammonia storage tank 10 may be provided in addition to the configuration of the fuel supply unit 20, while in the case of the high pressure skid (HP Skid), in addition to the configuration of the fuel supply unit 20, a fuel to be described later Components of the recovery unit may be provided together.

Referring to FIG. 4 , the low pressure part of the fuel supply unit 20 includes a low pressure pump 21 . The low-pressure pump 21 is responsible for withdrawing the ammonia stored in the ammonia storage tank 10 to the outside, and may be provided as a fixed capacity type or a variable capacity type (VFD).

The low-pressure pump 21 may be disposed downstream of the ammonia storage tank 10 as shown in the drawing, but may also be disposed within the ammonia storage tank 10. Furthermore, as described above, the low pressure pump 21 may be omitted depending on the type and internal pressure of the ammonia storage tank 10 .

Unlike the drawings, a plurality of low pressure pumps 21 may be provided to form a structure capable of backing up each other, and the plurality of low pressure pumps 21 may operate simultaneously and share loads. Alternatively, a plurality of low pressure pumps 21 may be provided in series to utilize a multi-stage pressurization method.

A constant flow of ammonia must be continuously introduced into the low pressure pump 21 , which is essential for stable operation of the low pressure pump 21 . This flow rate is referred to as the effective suction head (NPSHr), and a flow rate equal to or higher than the effective suction head flows into the low pressure pump 21 .

However, since the flow rate required by the engine E may be less than the effective suction head, a flow path for returning ammonia to the ammonia storage tank 10 may be provided downstream of the low pressure pump 21 . At this time, the return passage connected to the ammonia storage tank 10 downstream of the low pressure pump 21 may be connected to the pressure controller 12 .

Referring back to FIG. 4 , the high-pressure part of the fuel supply unit 20 includes a high-pressure pump 22 and a heat exchanger 23 . The high-pressure pump 22 pressurizes the ammonia pressurized by the low-pressure pump 21 to correspond to the required pressure of the engine E. One or more high-pressure pumps 22 may be provided in series or parallel, as in the case of the low-pressure pump 21 .

The high-pressure pump 22 may be provided as a variable displacement type, and the load may be variable according to the measured value of a flowmeter that may be provided between the low-pressure pump 21 and the high-pressure pump 22 . At this time, the flow meter may be provided at a position where the flow rate of surplus ammonia recovered by the fuel recovery unit is reflected.

The fuel recovery unit, which will be described later, may transfer surplus ammonia discharged from the engine E to the high-pressure pump 22, and the high-pressure pump 22 does not preferably inflow gaseous phase due to its specifications. Accordingly, it is required that ammonia upstream of the high-pressure pump 22 exist only in a liquid phase, and for this purpose, temperature and pressure upstream of the high-pressure pump 22 may be effectively controlled.

For example, ammonia recovered by the fuel recovery unit may be cooled, and the ammonia pressure upstream of the high-pressure pump 22 may be maintained high to increase the boiling point of ammonia, thereby suppressing vaporization.

As described in the low-pressure pump 21, the high-pressure pump 22 continuously introduces a minimum flow to satisfy the effective suction head, and returns downstream of the high-pressure pump 22 in case a surplus occurs line is provided. The return line allows an excess of the flow rate to be supplied to the engine E to be circulated from downstream to upstream of the high-pressure pump 22, and may be connected to the mixer 33 of the fuel recovery unit.

The heat exchanger 23 regulates the temperature of ammonia. The heat exchanger 23 may be provided between the low pressure pump 21 and the high pressure pump 22 and may be disposed on a high pressure skid. The heat exchanger 23 may adjust the temperature of ammonia in response to the required temperature of the engine E using a heat medium such as glycol water GW.

The heat exchanger 23 may be a heater for heating ammonia. In general, the required temperature of the engine E is higher than the storage temperature of the ammonia storage tank 10 (below the boiling point of ammonia at atmospheric pressure), and only the temperature rise generated when the low pressure pump 21 and the high pressure pump 22 are pressurized Since it is insufficient to meet the required temperature of (E), a heat exchanger 23 may be used.

However, the heat exchanger 23 is provided upstream of the high-pressure pump 22 so that the ammonia gas phase does not flow into the high-pressure pump 22, so that the temperature of ammonia can be properly adjusted. At this time, the heat exchanger 23 controls the heating temperature of ammonia in consideration of the recovery of ammonia by the fuel recovery unit.

The fuel supply unit 20 includes a heat supply unit 25 for supplying heat to the heat exchanger 23 and the like. The fruit supply unit 25 may circulate and supply fruit such as glycol water to the heat exchanger 23, and if necessary, the fruit may be replenished or discharged on the circulation passage of the fruit. Alternatively, the fruit supply unit 25 may be provided in a form of continuously supplying new fruit to pass through the heat exchanger 23 .

The heat supply unit 25 may heat or cool the temperature of the heat exchanger 23 to properly match the temperature of the heat exchanged with the heat exchanger ammonia. To this end, the fruit supply unit 25 may include both a fruit heater 251 and a fruit cooler 252.

The fruit heater 251 is a configuration for heating the fruit with a heat source such as steam, and can sufficiently raise the temperature of the fruit before the fruit is cooled by ammonia in the heat exchanger 23 and then introduced into the heat exchanger 23 again. there is. At this time, the heating temperature of the fruit may be adjusted by bypassing at least a part of the fruit heater 251.

The fruit cooler 252 is configured to heat the fruit with a cold source such as fresh water, and when the high-temperature ammonia recovered by the fuel recovery unit is relatively large, the temperature of the fruit is lowered and introduced into the high-pressure pump 22. The temperature of the ammonia can be adjusted appropriately. Alternatively, the fruit cooler 252 may cool the fruit heated by the cooler 31 of the fuel recovery unit described below. Cooling of the fruit cooler 252 can also be controlled by using partial bypass of the fruit as in the case of the fruit heater 251.

The heat medium cooler 252 and the heat medium heater 251 may be provided in parallel, or alternatively operated while being provided in series. Regarding the arrangement and operation of the heat medium cooler 252 and the heat medium heater 251, it is noted that various modifications are possible to efficiently control the temperature of the heat medium.

The fuel supply unit 20 includes a valve for adjusting the supply flow rate of ammonia immediately before the engine E, and at this time, such a valve may be referred to as a fuel supply valve train (SVT).

The fuel recovery unit recovers excess ammonia returned from the engine E. The currently developed or under development engine E for ammonia has a structure in which ammonia is supplied in liquid form and consumed, but an excess is supplied in order to stably supply the required flow rate.

At this time, excess ammonia may be discharged from the engine E after passing through at least a portion of the engine E, in which case the lubricating oil used in the engine E may be mixed with the ammonia. Therefore, the surplus ammonia discharged from the engine E is in a polluted state, and it is not desirable to return to the ammonia storage tank 10.

However, since this excess ammonia can be consumed by the engine E, the fuel recovery unit transfers the excess ammonia discharged from the engine E to the fuel supply unit 20. Specifically, the fuel recovery unit may transfer excess ammonia from the fuel supply unit 20 to the high-pressure pump 22, and includes a cooler 31, a catch drum 32, a mixer 33, and the like as shown in FIG. 4.

The cooler 31 cools the excess ammonia discharged from the engine E. Since the surplus ammonia passes through the engine E, it may be in a heated state due to the heat of the engine E, and when returned as it is and introduced into the high pressure pump 22, it may cause the inflow of gaseous phase in the high pressure pump 22. Therefore, the cooler 31 cools the surplus ammonia with fresh water and transfers it from the fuel supply unit 20 between the low-pressure pump 21 and the high-pressure pump 22, and suppresses the ammonia vapor from entering the high-pressure pump 22.

The cooler 31 may utilize the heat of the heat exchanger 23 . That is, the heat circulation passage of the fruit supply unit 25 may be provided to pass through the cooler 31, and the cooler 31 may be disposed downstream of the heat exchanger 23 based on the flow of the fruit.

Therefore, the fruit is cooled while heating ammonia in the heat exchanger 23, and then heated while cooling excess ammonia in the cooler 31. Afterwards, the fruit is introduced into the heat exchanger 23 again. At this time, the heat exchanger 23 may properly adjust the temperature of the fruit flowing into the heat exchanger 251 and/or the fruit cooler 252.

The catch drum 32 is provided in parallel with the cooler 31 and temporarily stores ammonia. The catch drum 32 may be configured to prevent gas from flowing into the high-pressure pump 22 by separating excess ammonia from gas-liquid. Also, the catch drum 32 may be provided to remove lubricating oil contained in excess ammonia.

Unlike the drawing, the catch drum 32 may have a structure including a gas-liquid separator and a knockout drum. In this case, excess ammonia first flows into the gas-liquid separator to separate the gas phase, and at least some of the excess ammonia in the liquid phase flows into the knockout drum to separate the lubricating oil. That is, although the above-described separation of the gas phase and the lubricating oil may be performed by a separate configuration, the catch drum 32 may include a configuration implementing these functions for convenience.

The mixer 33 mixes surplus ammonia discharged from the engine E with ammonia between the low pressure pump 21 and the high pressure pump 22 in the fuel supply unit 20 . The mixer 33 allows ammonia passing through the cooler 31 or the catch drum 32 to be mixed with the ammonia of the fuel supply unit 20, and may be provided as a mixer in the form of a container or an in-line mixer. there is.

The fuel recovery unit includes a valve for adjusting the return flow rate of ammonia immediately after the engine E, and at this time, these valves may be referred to as a fuel return valve train (RVT).

The exhaust processing unit 40 processes exhaust exhaust discharged from the engine E. The exhaust of the engine E may contain environmental pollutants such as various particles and nitrogen oxides (NOx). .

For example, the exhaust treatment unit 40 may be a selective catalytic reduction device (SCR) or a scrubber. However, in this embodiment, the exhaust treatment unit 40 may be provided to include at least SCR, and ammonia or the like may be used as a reducing agent.

The reducing agent used by the exhaust treatment unit 40 may be separately supplied from the outside, or may be delivered from the fuel supply unit 20 or the like. That is, the fuel supply unit 20 may transfer a portion of ammonia flowing toward the engine E to the exhaust treatment unit 40 in at least a portion of the low pressure part or the high pressure part. Accordingly, the exhaust treatment unit 40 may use at least a portion of ammonia supplied to the engine E by the fuel supply unit 20 as a reducing agent. However, ammonia in the high-pressure part of the fuel supply unit 20 may be transferred to the exhaust treatment unit 40 after lowering the pressure with a valve or the like.

In addition, the exhaust treatment unit 40 may also use ammonia delivered from the vent unit 50 as a reducing agent to purify nitrogen oxides and the like included in the exhaust of the engine E.

The engine E of this embodiment is an engine E that consumes ammonia, and a portion of ammonia may be mixed in the exhaust (ammonia slip). At this time, the exhaust treatment unit 40 may purify the ammonia contained in the exhaust by oxidizing the ammonia.

Oxidation of ammonia can be accomplished by SCR. That is, SCR reduces nitrogen oxides using ammonia, and the exhaust treatment unit 40 may cause ammonia to be oxidized by mutually reacting ammonia and nitrogen oxides contained in the exhaust gas.

Alternatively, oxidation of ammonia may be performed separately from SCR. In this case, the oxidation of ammonia may be a reaction in which ammonia reacts with oxygen to produce nitrogen oxide and water (4NH ₃ + 5O ₂ -> 4NO + 6H ₂ O), and the nitrogen oxide generated at this time is purified by the SCR described above. It can be. However, in this case, it is preferable that ammonia oxidation be performed before reduction of SCR.

Therefore, the exhaust treatment unit 40 may implement ammonia oxidation and nitrogen oxide reduction at once by having only a nitrogen oxide reduction unit (not shown), which is an SCR, or the exhaust treatment unit 40 may be provided with a nitrogen oxide reduction unit (not shown). ) and an ammonia oxidation unit (not shown).

In the latter case, the ammonia oxidizing section is disposed upstream of the nitrogen oxide reducing section, and ammonia mixed in the exhaust is changed into nitrogen oxides and water by ammonia slip. Thereafter, the nitrogen oxide reduction unit uses ammonia as a reducing agent to change nitrogen oxides into nitrogen and water (4NO + 4NH ₃ + O ₂ -> 2N ₂ + 3H ₂ O), so that the ratio of ammonia or nitrogen oxides in exhaust is within the standard. .

Of course, the exhaust treatment unit 40 includes an ammonia filter (not shown) that filters out ammonia mixed in the exhaust, and uses ammonia other than ammonia in the exhaust as a reducing agent in the nitrogen oxide reduction unit, or minimizes or omits the ammonia oxidation unit. can do.

The exhaust processing unit 40 may discharge the exhaust gas from the engine E into the air after sufficiently purifying the exhaust gas. Exhaust purified by the exhaust treatment unit 40 is discharged to the outside through a funnel having a certain height and treated so as not to harm people.

The vent unit 50 discharges ammonia discharged from the fuel supply unit 20 to the outside. The vent unit 50 serves to remove ammonia from the system in an abnormal situation, such as when an ammonia leak is detected or the system is shut down due to engine E stopping.

In addition to the fuel supply unit 20, the vent unit 50 may be provided to discharge ammonia discharged from the ammonia storage tank 10 and the fuel recovery unit to the outside. That is, the vent part 50 is connected to the parts where ammonia is stored or flows in the entire system to ensure a quick and safe discharge of ammonia.

The vent unit 50 includes discharge drums 51 and 52, a discharge processor 53, and a vent mast 54. The discharge drums 51 and 52 collect ammonia discharged from the ammonia storage tank 10, the fuel supply unit 20, or the fuel recovery unit.

The discharge drums 51 and 52 are in the form of containers and receive ammonia from the fuel supply unit 20 or the like. At this time, the ammonia delivered to the discharge drums 51 and 52 may be gaseous or liquid, but may be mainly gaseous.

The discharge drums 51 and 52 may collect ammonia using water. That is, water may be stored in the discharge drums 51 and 52, and ammonia flowing into the discharge drums 51 and 52 is dissolved in water to generate ammonia water.

Ammonia introduced into the discharge drums 51 and 52 may be transferred to an exhaust treatment unit 53 to be described later, or may be transferred to an exhaust treatment unit 40 . That is, ammonia water from the discharge drums 51 and 52 may be supplied to the exhaust treatment unit 40 and used as a reducing agent in the exhaust treatment unit 40 or may be oxidized in the exhaust treatment unit 40 .

The discharge drums 51 and 52 may be divided into a low pressure discharge drum 51 and a high pressure discharge drum 52 . The low-pressure discharge drum 51 collects ammonia discharged from the aforementioned low-pressure portion, and the high-pressure discharge drum 52 collects ammonia discharged from the high-pressure portion. That is, the low-pressure discharge drum 51 collects low-pressure ammonia discharged from the ammonia storage tank 10 or the low-pressure pump 21 of the fuel supply unit 20, and the high-pressure discharge drum 52 exchanges heat with the fuel supply unit 20. High-pressure ammonia discharged from the steamer 23, the high-pressure pump 22, the cooler 31 of the fuel recovery unit, the catch drum 32, or the like can be collected.

As described above, the low pressure discharge drum 51 and the high pressure discharge drum 52 may deliver ammonia to the exhaust treatment unit 53 or to the exhaust treatment unit 40 . In the former case, ammonia is delivered to the exhaust treatment unit 53 in a gaseous state, and in the latter case, ammonia is delivered to the exhaust treatment unit 40 in the form of ammonia water and used as a reducing agent or oxidized.

Alternatively, the low pressure discharge drum 51 and the high pressure discharge drum 52 may transfer at least a portion of the collected ammonia to the ammonia storage tank 10 or the like. That is, the low-pressure discharge drum 51 and the like have a structure capable of separating ammonia, and only ammonia can be recovered to the ammonia storage tank 10.

Instead of the low-pressure discharge drum 51 separating ammonia and transferring it to the ammonia storage tank 10, the low-pressure discharge drum 51 delivers a mixture of ammonia and water to the ammonia storage tank 10, A filter (not shown) for filtering out substances other than ammonia may be used.

That is, the discharge drums 51 and 52 recover the collected ammonia to the ammonia storage tank 10, and when recovery is difficult, it can be transferred to the exhaust treatment unit 40. Also, gaseous ammonia from the discharge drums 51 and 52 can be sent to the discharge processor 53 for treatment.

The low-pressure discharge drum 51 can directly deliver ammonia to the ammonia storage tank 10 or the discharge processor 53, while the high-pressure discharge drum 52 has a large internal pressure difference compared to the ammonia storage tank 10, etc. Ammonia in the discharge drum 52 may be delivered to the ammonia storage tank 10 or the like after depressurization using a valve or the like.

Conversely, when the pressure of the discharge drums 51 and 52 is insufficient, the internal pressure of the discharge drums 51 and 52 may be increased by using the purging part 80 . As will be described later, the purging unit 80 is a configuration for purging the fuel supply unit 20 and/or the fuel recovery unit using a non-explosive gas such as nitrogen. ) may inject non-explosive gas into the discharge drums 51 and 52.

Therefore, the internal pressure of the discharge drums 51 and 52 can be sufficiently increased by the purging unit 80, and through this, the ammonia stored in the discharge drums 51 and 52 is stored in the ammonia storage tank 10 or the ammonia storage tank 10 without separate pressurization or compression. It can be smoothly transferred to the exhaust processing unit 53 or the exhaust processing unit 40.

The discharge processor 53 treats ammonia and delivers it to the vent mast 54 . The discharge processor 53 collects ammonia transferred from the discharge drums 51 and 52 and transfers the ammonia to the vent mast 54 within a certain standard (eg, 30 ppm).

The discharge processor 53 is a component that collects ammonia using water, and may be a water tank that dissolves ammonia in water or a water scrubber that sprays water on ammonia. The material transferred to the vent mast 54 via 53) may be mainly nitrogen or the like.

The emission processor 53 may deliver ammonia water generated by mixing ammonia with water to the exhaust treatment unit 40 . That is, ammonia collected by the exhaust treatment unit 53 may be used as a reducing agent in the exhaust treatment unit 40, and at this time, the discharge pump 531 may be used.

However, the exhaust treatment unit 53 may adjust the ratio of ammonia to water according to the operating state of the exhaust treatment unit 40 . That is, the exhaust treatment unit 53 may adjust the inflow amount of ammonia water mixed with ammonia so that the exhaust treatment unit 40 can maintain normal operation. At this time, the exhaust processing unit 53 and the exhaust processing unit 40 may mutually control the delivery of the ammonia water through appropriate sensors and signal transmission.

For example, a sensor for measuring pollutants in the discharged exhaust gas is provided in the exhaust processing unit 40, and the source of the ammonia water delivered to the exhaust processing unit 40 from the exhaust processing unit 53 can be adjusted according to the measurement value of the sensor. . And/or the temperature, pressure, and flow rate of exhaust flowing into the exhaust treatment unit 40 may be used as control variables of the exhaust treatment unit 53 .

The re-liquefaction unit 60 re-liquefies the boil-off gas discharged from the ammonia storage tank 10 . The re-liquefaction unit 60 may re-liquefy ammonia using a refrigerant other than ammonia (Indirect Type). In this case, the refrigerant may be nitrogen, mixed refrigerant, or the like.

Alternatively, the re-liquefaction unit 60 may be provided as a direct type that implements re-liquefaction of ammonia by using heat exchange between ammonia. For example, the re-liquefying unit 60 may be used as a refrigerant that compresses and cools ammonia, liquefies some of it by reducing pressure, and liquefies the rest.

For the method of re-liquefying ammonia by the re-liquefaction unit 60, various well-known re-liquefying devices may be used, and a detailed description thereof will be omitted.

The reliquefaction unit 60 may transfer at least a portion of the boil-off gas to the low pressure discharge drum 51 or the exhaust treatment unit 40 . The re-liquefaction unit 60 includes a compressor (not shown) to improve the liquefaction performance of the boil-off gas, and the boil-off gas compressed by the compressor of the re-liquefaction unit 60 is transferred to the low pressure discharge drum 51 to form a low pressure discharge drum. (51) can help increase the internal pressure. Alternatively, the reliquefaction unit 60 may compress and deliver the boil-off gas in order to assist the pressure of ammonia transferred from the discharge drums 51 and 52 or the discharge processor 53 to the exhaust treatment unit 40 .

At this time, the re-liquefaction unit 60 may adjust the load of the compressor based on the internal pressure of the discharge drums 51 and 52 and the like. That is, the re-liquefaction unit 60 may operate the compressor exclusively for re-liquefaction when re-liquefaction of ammonia boil-off gas is required, and operate the compressor for ammonia delivery when delivery of ammonia boil-off gas is required. In this case, the re-liquefaction unit 60 may include one or more compressors, one of which may be used for re-liquefaction and the other for ammonia delivery.

Of course, the re-liquefaction unit 60 can also transfer the ammonia discharged from the ammonia storage tank 10 to the discharge drums 51 and 52, the exhaust treatment unit 40, etc. in a state before compression. As some of the boil-off gas discharged from 10) is transferred to the discharge drums 51 and 52, the load may be lowered.

The drain processing unit 70 recovers ammonia drained from the fuel supply unit 20 or the fuel recovery unit to the ammonia storage tank 10 . That is, the drain processing unit 70 collects ammonia remaining in the low pressure part, the high pressure part, the fuel supply valve train, the fuel recovery part, the fuel return valve train, etc. of the fuel supply part 20, and the discharge drum ( Through 51 and 52, it is possible to minimize the amount going to the discharge processor 53.

The drain processing unit 70 may recover ammonia that is drained when the operation of the engine E is stopped and the ammonia remaining in the fuel supply unit 20 or the like needs to be recovered or when the system is purged. That is, the drain may be performed separately from purging or during purging.

The drain processing unit 70 may be structurally disposed below the fuel supply unit 20 so that liquid ammonia can be smoothly drained, and can return the drained ammonia to the ammonia storage tank 10 when necessary. As shown in FIG. 3 , the drain processing unit 70 may include a drain drum 71 , a drain pump 72 , and a drain valve 73 .

The drain drum 71 collects ammonia drained from the fuel supply unit 20 . The drain drum 71 is provided in the form of a container to collect a certain amount of ammonia. However, since the non-explosive gas of the purging unit 80 can be injected into the fuel supply unit 20 for smooth draining of the fuel supply unit 20, etc., the ammonia flowing into the drain drum 71 is mixed with the non-explosive gas There may be.

A liquid detector 711 is provided on the drain drum 71 . The liquid detector 711 detects liquid droplets in the drain drum 71. As described above, the drain drum 71 will be inflow of ammonia or non-explosive gas, and the liquid detector 711 detects the liquid droplets. If it does, it can be seen as meaning that the drain has been made. Accordingly, when the drain of ammonia is sensed, ammonia in the drain drum 71 may be recovered by a drain pump 72 to be described later.

The drain pump 72 transfers ammonia from the drain drum 71 to the ammonia storage tank 10 . When the liquid detector 711 detects that ammonia flows into the drain drum 71 , the drain pump 72 may pump the ammonia of the drain drum 71 . At this time, the liquid detector 711 can detect ammonia at a certain level of the drain drum 71, so that the drain pump 72 is operated when the drained ammonia reaches a certain amount or more.

However, it may be preferable for operation to directly recover the drained ammonia to the ammonia storage tank 10 rather than continuously storing the drained ammonia in the drain drum 71. Therefore, the drain pump 72 can be provided in a type that does not cause any problems even when gas is introduced.

For example, the drain pump 72 may be provided as a low-speed pump using nitrogen or instrument air as a driving force in consideration that gas may be included in the introduced fluid. Therefore, the function of the drain pump 72 may not be damaged even if gas flows into the inside.

For example, the drain pump 72 may be provided in a type that operates by using the non-explosive gas of the purging unit 80 as a driving source. Therefore, since the drain processing unit 70 recovers ammonia to the ammonia storage tank 10 using the non-explosive gas of the purging unit 80 as a driving source, risk can be minimized by not using combustible materials during drain processing.

The drain valve 73 is provided in parallel with the drain pump 72 to transfer ammonia from the drain drum 71 to the ammonia storage tank 10. The drain valve 73 may be used instead of the drain pump 72 when the internal pressure of the drain drum 71 is high.

The drain valve 73 is a non-return valve, and is opened when high-pressure fluid flows into the drain drum 71, and the differential pressure between the drain drum 71 and the ammonia storage tank 10 without operating the drain pump 72. Ammonia can be recovered to the ammonia storage tank 10 by utilizing.

Of course, the operation of the drain valve 73 and the drain pump 72 are linked, so that when the drain valve 73 is opened, the inflow of ammonia to the drain pump 72 is blocked, and conversely, when the drain pump 72 is operated, the drain valve ( 73) can be closed.

A filter 74 may be provided downstream of the drain pump 72 and the drain valve 73 . The filter 74 is for removing impurities present in ammonia, and a known membrane filter or the like can be used.

The purging unit 80 purifies the fuel supply unit 20 and the fuel recovery unit using nitrogen or the like, which is a non-explosive gas. The purging unit 80 operates when the ammonia passage in the system needs to be emptied, and can purge the ammonia passage by using a non-explosive gas such as nitrogen as a purging gas.

As shown in FIG. 2 , the purging unit 80 may deliver non-explosive gas to the discharge drums 51 and 52 . When the internal pressure of the discharge drums 51 and 52 is not sufficient, the present embodiment uses the purging unit 80 to inject nitrogen into the discharge drums 51 and 52 to reduce the internal pressure of the discharge drums 51 and 52. It is possible to smoothly adjust the flow of ammonia from the discharge drums 51 and 52 to the discharge treatment unit 53 and the like by raising it.

In addition, the purging unit 80 may supply non-explosive gas as a driving source for the drain processing unit 70 to recover ammonia to the ammonia storage tank 10 as shown in FIG. 3 . For example, the purging unit 80 may supply non-explosive gas to the drain pump 72 to implement the operation of the drain pump 72, or inject non-explosive gas to the drain drum 71 to close the drain valve 73. It is also possible to implement ammonia delivery through.

That is, considering that the purging unit 80 is configured to supply non-hazardous non-explosive gas, it not only performs the basic function of purging the ammonia flow path, but also assists the operation of the vent unit 50 or the drain processing unit 70. Additional functions may be performed.

As described above, according to the present embodiment, while supplying ammonia as fuel to the engine E, it is possible to build an eco-friendly fuel supply system by stably implementing venting, draining, and oxidation treatment of ammonia.

In addition, the present embodiment primarily collects ammonia suddenly discharged during system operation using the discharge drums 51 and 52, etc., and secondarily processes the remaining ammonia through the exhaust treatment unit 40, It is possible to minimize unnecessary venting and ensure safe system operation.

5 is a conceptual diagram of an ammonia treatment system according to a second embodiment of the present invention.

Hereinafter, the description will focus on the differences of this embodiment compared to the previous embodiments, and the parts omitted from explanation will be replaced with the previous contents. Note that this applies equally to other embodiments to be described later.

Referring to FIG. 5 , in the ammonia treatment system 1 according to the second embodiment of the present invention, the heat exchanger 23 of the fuel supply unit 20 and the mixer 33 of the fuel recovery unit are disposed compared to the previous embodiment. Changed. In the case of the first embodiment, the mixer 33 is disposed downstream of the heat exchanger 23 based on the flow of ammonia in the fuel supply unit 20. In this embodiment, the heat exchanger 23 is downstream of the mixer 33 can be placed.

In addition, a non-return valve is provided upstream of the mixer 33 on the ammonia flow path of the fuel supply unit 20, so that the ammonia mixed with lubricating oil is transferred to the ammonia storage tank 10 while passing through the engine E. It is prevented.

The heat exchanger 23 provided downstream of the mixer 33 may implement heating or cooling of ammonia. When the engine E is operated at a low load, the recirculation amount of ammonia increases, and at this time, the ammonia in the mixer 33 becomes relatively high temperature. Accordingly, the heat exchanger 23 cools the ammonia between the mixer 33 and the high-pressure pump 22, thereby preventing gas from entering the high-pressure pump 22.

On the other hand, when the load of the engine E increases, the flow rate of surplus ammonia decreases, so the ammonia in the mixer 33 becomes relatively low temperature, and the heat exchanger 23 heats the ammonia and delivers it to the high pressure pump 22. can

That is, the heat exchanger 23 can heat or cool ammonia according to the load of the engine E. For example, heat exchanger 23 is continuously supplied with a sufficient amount of heat having a constant temperature to heat exchanger 23. Incoming ammonia can be heated or cooled while matching the temperature of the fruit.

6 is a conceptual diagram of an ammonia treatment system according to a third embodiment of the present invention.

Referring to FIG. 6 , the ammonia treatment system 1 according to the third embodiment of the present invention may further include a return heat exchanger 24 compared to the first embodiment.

The return heat exchanger 24 controls the temperature of the ammonia returned from downstream of the high-pressure pump 22 upstream of the high-pressure pump 22 . As described above, a return line is provided downstream of the high-pressure pump 22, and the return heat exchanger 24 is provided on the return line to cool the ammonia transferred from the high-pressure pump 22 to the mixer 33.

When the high-pressure pump 22 or the like is running in a state where the engine E does not use ammonia as fuel (the engine E is stopped or the engine E is running with fuel other than ammonia), ammonia is supplied to the high-pressure pump 22 ), but it is circulated along the return line without flowing into the engine (E).

In this case, since ammonia may be vaporized due to heat generated by the high-pressure pump 22, heat generated from the high-pressure pump 22 should be removed. Therefore, in the present embodiment, the ammonia can be cooled by using a refrigerant such as fresh water, seawater, or glycol water by placing the return heat exchanger 24 in the return line. Accordingly, the return heat exchanger 24 may also be referred to as a return cooler 31 .

In addition, the return heat exchanger 24 may use the heat circulated by the heat supply unit 25, and in this case, the heat cooled by ammonia while passing through the heat exchanger 23 at the front of the high pressure pump 22 may be used. there is.

Therefore, in this embodiment, although the high-pressure pump 22 is in operation, ammonia is not supplied from the high-pressure pump 22 to the engine E, so that ammonia downstream of the high-pressure pump 22 is continuously supplied to the high-pressure pump 22. When circulating upstream, evaporation of ammonia in the high-pressure pump 22 and the like can be suppressed by cooling the circulated ammonia.

7 is a conceptual diagram of an ammonia treatment system according to a fourth embodiment of the present invention.

Referring to FIG. 7 , in the ammonia treatment system 1 according to the fourth embodiment of the present invention, the heat exchanger 23 of the fuel supply unit 20 is a first heat exchanger 231 and a second heat exchanger 232 can include The first heat exchanger 231 is provided between the low pressure pump 21 and the high pressure pump 22, and may be provided between the mixer 33 and the high pressure pump 22, for example. At this time, it is as described in the second embodiment that the first heat exchanger 231 can implement heating or cooling.

The second heat exchanger 232 is provided between the high pressure pump 22 and the engine E. The second heat exchanger 232 may heat or cool the ammonia pressurized by the high-pressure pump 22 to meet the required temperature of the engine E.

As will be described later, in this embodiment, the second cooler 312 is placed downstream of the high-pressure pump 22 so that the excess ammonia and the ammonia downstream of the high-pressure pump 22 exchange heat. In this case, after being pressurized by the high-pressure pump 22 There is a possibility that the temperature of the ammonia heat-exchanged in the second cooler 312 is not constant. Therefore, in this embodiment, the second heat exchanger 232 is provided between the second cooler 312 and the engine E, so that the temperature of the ammonia flowing into the engine E can be constantly adjusted.

The cooler 31 of the fuel recovery unit according to the present embodiment may include a first cooler 311 and a second cooler 312 . The first cooler 311 cools ammonia using a medium provided separately from ammonia, and the medium may be a heat used in the heat exchanger 23 .

The first cooler 311 may have a configuration similar to that of the cooler 31 in the first embodiment, and may be provided in parallel with the catch drum 32 to cool excess ammonia and deliver it to the mixer 33.

The second cooler 312 is provided downstream or upstream of the first cooler 311 and uses ammonia from the fuel supply unit 20 . That is, the second cooler 312 is configured to realize heat exchange between ammonia, and can exchange heat between excess ammonia and ammonia downstream of the high-pressure pump 22 .

From the point of view of fuel supply, since the temperature of the ammonia pressurized by the high-pressure pump 22 is changed by the second cooler 312 before being supplied to the engine E, the temperature is controlled to meet the required temperature of the engine E. It is as described above that the two heat exchangers 232 may be used.

On the other hand, from the point of view of fuel recovery, the surplus ammonia discharged from the engine E is first cooled in the first cooler 311 and then secondarily cooled in the second cooler 312, and when circulated by the high pressure pump 22, the gas occurrence can be sufficiently suppressed. Furthermore, the fuel recovery unit can prevent vaporization by maintaining the ammonia above the saturation pressure of the corresponding temperature using the pressure control valve 34 .

The pressure control valve 34 is provided downstream of the cooler 31 based on the flow of surplus ammonia, and may be disposed between the second cooler 312 and the mixer 33, for example. The pressure control valve 34 maintains ammonia flowing from the fuel recovery unit toward the fuel supply unit 20 at a saturation pressure higher than the saturation pressure of the corresponding temperature (for example, 15 bar or higher), so that excess ammonia passing through the second cooler 312 It can be kept in liquid form.

The pressure control valve 34 maintains the excess ammonia of the second cooler 312 in a liquid phase, so that the cooling efficiency of the excess ammonia in the second cooler 312 can be increased. Of course, as the ammonia downstream of the pressure control valve 34 is reduced in pressure, the ammonia may change below the saturation pressure, but since the surplus ammonia is sufficiently cooled in the second cooler 312, gas phase may occur downstream of the pressure control valve 34. It is unlikely, and some additional cooling can be expected during depressurization.

Therefore, in this embodiment, the heat is cooled through the low-temperature ammonia upstream of the high-pressure pump 22 (first heat exchanger 231), the excess ammonia is cooled with the cooled heat (first cooler 311), and the pressure The control valve 34 maintains the pressure of the excess ammonia high to increase the cooling efficiency (second cooler 312), so that when the excess ammonia flows into the high-pressure pump 22, vaporization can be effectively suppressed.

8 is a conceptual diagram of an ammonia treatment system according to a fifth embodiment of the present invention.

Referring to FIG. 8 , the ammonia treatment system 1 according to the fifth embodiment of the present invention includes a housing 35 in which a fuel supply unit 20 and a fuel recovery unit surround at least a portion of an ammonia passage.

As mentioned above, the ammonia flow path may be a pipeline, and as the housing 35 surrounds the outer circumference of the pipeline, the ammonia flow path may form a double pipe structure. Therefore, the housing 35 prevents ammonia from directly penetrating into the external space when ammonia leaks from the ammonia passage, and the housing 35 can be filled with non-explosive gas.

For example, a non-explosive gas may be supplied to the housing 35 by a purging unit 80 or a vent unit 50, and the non-explosive gas circulating through the housing 35 may be discharged into the atmosphere. Hereinafter, a case where non-explosive vent gas is introduced into the housing 35 by the vent unit 50 will be described.

The vent unit 50 injects the vent gas into one side of the housing 35 and recovers the vent gas from the other side of the housing 35 . For example, the vent unit 50 injects the vent gas from the housing 35 of the fuel recovery unit to one side adjacent to the engine E, passes through the cooler 31 or the catch drum 32, and also via the high-pressure pump 22. One vent gas can be recovered from the housing 35 of the fuel supply 20 from the other side adjacent to the engine E. Therefore, the vent gas can circulate most of the high-pressure part.

At this time, there is a possibility that ammonia may be mixed in the vent gas recovered from the housing 35 of the fuel supply unit 20 due to leakage on the ammonia passage, and the vent unit 50 waits for the vent gas recovered from the housing 35. It can be stored in the vent drum 55 without immediately discharging it.

The vent drum 55 uses water to collect ammonia contained in the vent gas. That is, the vent drum 55 may be a water tank, and may dissolve ammonia that may be mixed in the vent gas into water by passing the vent gas through the water.

At this time, a pH sensor 551 is provided on the vent drum 55 . The pH sensor 551 may check whether ammonia is introduced into the vent drum 55 by measuring the pH of water stored in the vent drum 55 .

Vent gas introduced into the vent drum 55 may be discharged into the atmosphere through an outlet line, and a gas detector 552 may be provided at a portion where the vent gas is discharged from the vent drum 55 .

When ammonia is included in the vent gas, the ammonia may be dissolved in water while the vent gas passes through the water of the vent drum 55, but the ammonia that is not yet dissolved in water may be discharged to the outside of the vent drum 55.

To prepare for this, the vent unit 50 first detects the inflow of ammonia in the vent drum 55 using the pH sensor 551, and ammonia through the gas detector 552 in the discharge portion of the vent drum 55. The existence of can be detected secondarily.

At this time, emission of the vent gas into the air from the vent drum 55 may be blocked according to the detection value of the gas detector 552 . Through this, even if the vent gas is discharged to the atmosphere, the risk due to ammonia leakage can be sufficiently suppressed.

For reference, the vent unit 50 may use a vent fan 56 for forcibly recovering vent gas from the housing 35 of the fuel supply unit 20 to the vent drum 55, which is in the housing 35 of the fuel recovery unit. It can be used when the flow of the vent gas does not reach the desired level because the pressure of the introduced vent gas is not sufficient. Of course, when high-pressure vent gas is injected into the housing 35 of the fuel recovery unit, the vent fan 56 may be minimized or omitted.

As described above, in the present embodiment, in preparation for a case where ammonia leaks from the ammonia passage, pH and gas detection can be implemented in the vent drum 55 to ensure that ammonia is discharged into the air at a safe level.

In addition to the above-described embodiments, the present invention encompasses all embodiments resulting from a combination of the above embodiments and the known technology.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and within the technical spirit of the present invention, by those skilled in the art It will be clear that the modification or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

1: ammonia treatment system E: engine
10: ammonia storage tank 11: bunkering unit
12: pressure control unit 20: fuel supply unit
21: low pressure pump 22: high pressure pump
23: heat exchanger 231: first heat exchanger
232: second heat exchanger 24: return heat exchanger
25: fruit supply unit 251: fruit heater
252: fruit cooler 26: housing
30: fuel recovery unit 31: cooler
311: first cooler 312: second cooler
32: catch drum 33: mixer
34: pressure control valve 35: housing
40: exhaust processing unit 50: vent unit
51: low pressure discharge drum 52: high pressure discharge drum
53 discharge handler 531 discharge pump
54: bent mast 55: bent drum
551: pH sensor 552: gas detector
56: vent fan 60: re-liquefaction unit
70: drain processing unit 71: drain drum
711: liquid detector 72: drain pump
73: drain valve 74: filter
80: purging unit

Claims (5)

A fuel supply unit supplying ammonia discharged from the ammonia storage tank to the engine;
a fuel recovery unit that recovers excess ammonia returned from the engine;
an exhaust processing unit that processes exhaust exhaust from the engine;
a vent unit discharging ammonia discharged from the fuel supply unit or the fuel recovery unit to the outside;
a purging unit purging the fuel supply unit or the fuel recovery unit using a non-explosive gas; and
And a drain processing unit for recovering ammonia drained from the fuel supply unit to the ammonia storage tank,
The drain processing unit,
Ammonia treatment system for recovering ammonia to the ammonia storage tank by using the non-explosive gas of the purging unit as a driving source. The method of claim 1, wherein the drain processing unit,
a drain drum for collecting ammonia drained from the fuel supply unit; and
And a drain pump for transferring the ammonia of the drain drum to the ammonia storage tank,
The drain pump,
An ammonia treatment system operated using non-explosive gas as a driving source. According to claim 1,
The drain drum,
Collecting non-explosive gas and ammonia during purging of the fuel supply unit by the purging unit, a liquid detector is provided,
The drain pump is operated when the liquid sensor detects liquid. The method of claim 1, wherein the drain processing unit,
Ammonia treatment system further comprising a drain valve provided in parallel with the drain pump and opened according to the internal pressure of the drain drum to transfer ammonia in the drain drum to the ammonia storage tank. A vessel comprising the ammonia treatment system of any one of claims 1 to 4.

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