KR102335454B1 - Fuel supply system for vessel and vessel including the same - Google Patents

Abstract

The present invention is to provide a fuel supply system for ships that processes boil-off gas generated in the fuel supply system for ships that supplies ammonia as fuel, and a ship equipped with the system. According to an embodiment of the present invention, a fuel supply system for ships comprises: a storage tank which stores liquefied ammonia as fuel supplied to a marine engine; a first pipe connected to the storage tank to supply fuel to the engine; and a pressure tank connected to the first pipe.

Description

A fuel supply system for ships and a ship equipped with the system

The present invention relates to a fuel supply system for a vessel and a vessel having the system, and more particularly, to a vessel fuel supply system for processing boil off gas generated from a fuel supply system for a vessel using ammonia as a fuel. And it relates to a ship equipped with the system.

The consumption of liquefied gas such as LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas) is rapidly increasing worldwide. Liquefied gas is transported in a gaseous state through onshore or offshore gas pipelines, or stored in a liquefied gas carrier in a liquefied state and transported to a remote consumer.

On the other hand, liquefied gas carriers and the like employ a fuel supply system using heavy oil such as bunker C oil, which is relatively inexpensive as a propulsion fuel for ships. Due to the strengthening of the fuel oil tank (LSHFO tank) with low sulfur content, the demand for an eco-friendly fuel supply system that meets international environmental regulations has increased.

Therefore, the liquefied gas carrier uses a fuel supply system using liquefied gas and boil-off gas generated therefrom as a propulsion fuel. Liquefied natural gas, known as one of the eco-friendly fuels, can reduce fine dust and carbon dioxide as well as respond to sulfur oxide regulations, but there is a limit to complete decarbonization because it emits carbon dioxide as a fossil fuel.

In order to comply with the strengthened International Maritime Organization (IMO) ship Green-House Gas (GHG) and CO _{2 reduction regulations, ammonia (NH 3} ) gas as a fuel other than LPG or LNG has begun to pay attention.

Accordingly, an object of the present invention is to provide a fuel supply system for ships that processes boil-off gas generated from a fuel supply system that supplies ammonia as fuel as a fuel for ships, and a ship equipped with the system.

The fuel supply system for ships according to an embodiment of the present invention is connected to the storage tanks 100 and 110 in which liquefied ammonia is stored as fuel supplied to the marine engine (E), the storage tanks 100 and 110, and the engine ( A first pipe (L1) for supplying fuel to E), and a pressure tank 101 connected to the first pipe (L1).

In addition, a third pipe (L3) connecting between the pressurized tank 101 and the storage tanks (100, 110) is connected to the third pipe (L3) and generated in the storage tanks (100, 110) It may further include a compressor 201 for pressurizing BOG, and a cooling pipe 202 arranged in the pressurized tank 101 to exchange heat with ammonia in the pressurized tank 101 .

In addition, it may further include a heater connected to the first pipe (L1).

In addition, the heater may include a pre-heater 103 and an after-heater 104 .

In addition, a second pipe (L2) for transferring excess ammonia discharged from the engine (E) to the pressurized tank (101), and a return cooler (203) sequentially connected to the second pipe (L2), the pre-heater (103), it may further include a pressure control valve (V).

In addition, the pre-heater 103 exchanges heat with the liquefied ammonia passing through the first pipe L1, which is relatively low, and the liquefied ammonia, which passes through the second pipe L2, which is relatively high, to the first pipe L1. It can increase the temperature of liquid ammonia passing through it.

In addition, a glycol heater 302 connected to the after-heater 104 and a fifth pipe L5 to supply heated glycol water to the after-heater 104 may be further included.

In addition, it further includes an eighth pipe (L8) connecting between the after heater 104 and the return cooler 203, and the glycol water discharged from the after heater 104 is the eighth pipe (L8). The liquefied ammonia may be supplied to the return cooler 203 through the , lowering the temperature of the liquefied ammonia flowing through the second pipe L2, and then discharged through the ninth pipe L9.

In addition, the glycol water may be discharged through the ninth pipe L9 to the seventh pipe L7 in which the glycol pump 303 is installed and delivered to the glycol heater 302 .

In addition, a sixth pipe (L6) connecting between the after heater (104) and the cooling pipe (202) is further included, and the glycol water supplied through the sixth pipe (L6) is supplied to the cooling pipe (202). ), after exchanging heat with ammonia in the pressurized tank 101 , it may be supplied to the glycol heater 302 through the seventh pipe L7 .

In addition, a seawater pump 301 connected to the glycol heater 302 through a fourth pipe L4 to supply seawater for heating the glycol water supplied to the glycol heater 302 may be further included.

In addition, it may further include an additional heat source for increasing the temperature of the glycol water.

In addition, the storage tanks 100 and 110 may be any one of IMO type A, IMO type B, and IMO type C.

A ship according to an embodiment of the present invention may include the above-described fuel supply system.

In the present invention, it is possible to reduce the emission of carbon dioxide by supplying ammonia as a fuel.

In addition, in the present invention, it is not necessary to separately provide a reliquefaction facility for reliquefying ammonia boil-off gas continuously generated in the ammonia fuel storage tank, so that an economical fuel supply system for ships can be built, and the ammonia storage tank design The pressure can be designed to be low.

1 is a view schematically showing a ship including a fuel supply system for a ship according to an embodiment of the present invention.
2 is a schematic diagram of a fuel supply system for a ship according to an embodiment of the present invention.
3 and 4 are diagrams for explaining the fuel flow of the fuel supply system for a ship shown in FIG. 1 .
5 is a configuration diagram of a fuel supply system for a ship according to another embodiment of the present invention.

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

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a view schematically showing a ship including a fuel supply system for a ship according to an embodiment of the present invention.

As shown in FIG. 1 , a fuel supply system 1000 for a ship according to an embodiment of the present invention may be installed in a ship. Vessels may include, but are not limited to, ammonia (NH _{3 ) carriers.} In the fuel supply system 1000 for a ship according to an embodiment of the present invention, ammonia stored in the cargo hold as a fuel for an engine E for driving a ship may be supplied as fuel through the pipes L1, L2, and L3.

Hereinafter, a fuel supply system for a ship according to an embodiment of the present invention will be described in detail.

2 is a schematic diagram of a fuel supply system for a ship according to an embodiment of the present invention, and FIGS. 3 and 4 are diagrams for explaining a fuel flow of the fuel supply system for a ship shown in FIG. 1 .

As shown in Figure 2, the marine fuel supply system according to an embodiment of the present invention is a system for supplying ammonia (NH ₃ ) as a fuel to the marine engine (E), and a storage tank 100 for storing ammonia. Including, the storage tank 100 and the engine (E) may be connected through the first pipe (L1). A valve (not shown) for controlling the flow of a fluid moving in the first pipe L1 may be connected to the first pipe L1 .

The storage tank 100 may be an insulated tank in which liquefied ammonia is stored. The storage tank 100 may be an IMO type A storage tank. The storage tank 100 may include a primary barrier and a secondary barrier that completely surrounds the primary barrier to prevent leakage of liquefied ammonia due to the breakage of the primary barrier, and the secondary barrier is a hull can be

A pressurized tank 101 , a booster pump 102 , a pre-heater 103 , and an after heater 104 may be sequentially connected to the first pipe L1 .

An ammonia supply pump 10 may be installed inside the storage tank 100 . Ammonia feed pump 10 may provide a pump pressure to transport ammonia. In particular, the ammonia supply pump 10 may be a submerged pump or a deep well pump installed in the ammonia filled in the storage tank 100 .

Ammonia stored in the storage tank 100 is pumped through the ammonia supply pump 10 and then supplied to the pressurized tank 101, pressurized through the booster pump 102, and then heated primarily through the pre-heater 103, , may be supplied to the engine E after secondary heating through the after-heater 104 (refer to the dotted arrow in FIG. 3 ).

The pressurized tank 101 may receive the pumped liquefied ammonia from the storage tank 100 and temporarily store the liquefied ammonia. According to one embodiment, the pressurized tank 101 stores a certain amount of liquefied ammonia and serves as a buffer tank for stably supplying liquefied ammonia to the engine E through the booster pump 102 and the pre-heater 103 . can be done

In addition, the pressure tank 101 may include a cooling pipe 202 therein. The cooling pipe 202 is connected to the sixth pipe (L6), receives the cooled glycol water from the sixth pipe (L6), and after heat exchange with ammonia is made in the pressurized tank 101, the seventh pipe ( L7). Through this, ammonia condensed in a liquid state in the pressure tank 10 can maintain a constant temperature.

The pressurized tank 101 can store the condensed fuel (ammonia) without a separate boil-off gas treatment device because sufficient temperature and pressure to maintain ammonia in a liquid state are maintained. In particular, BOG is continuously generated in the storage tank 100 even when there is no fuel consumption in the engine, such as during fuel loading or anchoring, and the BOG generated at this time is stored in the pressurized tank 101 and , It is possible to prevent the pressure of the storage tank 100 from rising by using it as fuel during the subsequent voyage.

In general, in order to process boil-off gas of low-temperature liquefied gas including ammonia, a separate re-liquefaction facility must be equipped. However, according to the embodiment of the present invention, it is not necessary to separately equip an expensive reliquefaction facility, and thus an economical fuel supply system can be configured. In addition, there is no need to design a high design pressure of the storage tank 100, the material cost reduction effect can also be obtained.

The inside of the pressurization tank 101 may be pressurized to a pressure higher than atmospheric pressure, and may be appropriately set in consideration of the required flow rate of the booster pump 102 .

Since the pressure of the pressurization tank 101 may be set to a low pressure, which is the pressure of the storage tank 100 , the pressure may be increased to a high pressure required by the engine E through the booster pump 102 .

The pre-heater 103 may first increase the temperature of the liquefied ammonia pressurized to a high pressure, and the after-heater 104 may secondarily raise the temperature required by the engine E.

The pre-heater 103 uses the heat of the recovered ammonia to heat ammonia in the first pipe L1 when recovering ammonia supplied to the engine E and remaining through a second pipe L2 to be described later. will be.

That is, after being supplied to the engine, the recovered ammonia is heated to a temperature suitable for the engine E, and thus the recovered ammonia is also heated and maintained at a high temperature. Therefore, by exchanging this with the low-temperature liquefied ammonia supplied to the engine through the first pipe L1, the temperature of the liquefied ammonia in the first pipe L1 can be increased.

In this case, heat exchange through the liquefied ammonia of the second pipe (L2) may not heat the liquefied ammonia of the first pipe (L1) to a temperature required by the engine (E).

Therefore, by directly heating the liquefied ammonia in the first pipe L1 through the after-heater 104, it is possible to sufficiently raise the temperature to an appropriate temperature required for the engine E.

Ammonia remaining after being supplied to the engine E may be recovered (refer to the dotted arrow in FIG. 4 ) through the second pipe L2 . In this case, the recovered ammonia is recovered after being supplied as fuel to the engine E, and may be in a liquid state of high temperature and high pressure required by the engine E. Accordingly, the recovered ammonia may be first cooled through the return cooler 203 and then secondarily cooled through the pre-heater 103 .

The liquefied ammonia supplied to the pre-heater 103 through the first pipe L1 is liquefied ammonia discharged from the pressurized tank 101 and supplied to the engine E, rather than the ammonia recovered through the second pipe L2. It may be a low temperature. Therefore, by heat exchange between ammonia in the second pipe L2 and ammonia in the first pipe L1 through the pre-heater 103, the ammonia in the second pipe L2 is secondary cooled, and the ammonia in the first pipe L1 is cooled. ) of ammonia may increase in temperature.

Since the pressure of liquefied ammonia in the second pipe (L2), which has been secondary cooled by heat exchange through the pre-heater 103, is still high, the pressure is lowered through the pressure control valve (V) and then transferred to the pressurized tank 101 and stored and can be reused as fuel.

Since the BOG generated in the storage tank 100 increases the internal pressure of the storage tank 100, it is discharged through the third pipe L3 and then supplied to the pressurized tank 101 after being pressurized, condensed and liquefied ( See the dotted arrow in FIG. 3).

The third pipe L3 may connect between the storage tank 100 and the pressurization tank 101 , and at least one compressor 201 may be connected to the third pipe L3 .

BOG generated in the storage tank 100 may be transferred to the compressor 201 through the third pipe L3 , and the BOG may be compressed in the compressor 201 . BOG may be compressed in one stage or multiple stages in the compressor 201 , and an appropriate number of compressors 201 may be selected according to the capacity and storage pressure of the compressor 201 .

The pressurized ammonia is supplied to the pressurized tank 101, mixed with the liquefied ammonia supplied through the first pipe L1, and together with the liquefied ammonia delivered through the first pipe L1 as fuel to the engine E can be supplied.

On the other hand, the after heater 104 and the return cooler 203 connected to the first pipe L1, the second pipe L2, and the third pipe L3 to control the temperature of liquefied ammonia are refrigerants, for example, , and may be connected to a heat exchange system using glycol water or the like.

The heat exchange system includes a seawater pump 301 that supplies seawater, a glycol heater 302 connected to the seawater pump 301 and the fourth pipe L4, and a glycol pump that circulates glycol water and supplies the glycol heater 302 ( 303) may be included. On the other hand, when the temperature of the seawater supplied through the seawater pump 301 is not high enough to raise the temperature of the glycol water through the glycol heater 302, glycol by an additional heat source (not shown) such as a steam heater The water can be heated further.

The seawater pump 301 pumps seawater and supplies it to the glycol heater 302 through the fourth pipe L4, and the glycol water supplied to the glycol heater 302 through the glycol pump 303 is the glycol heater 302. It is discharged after the temperature rises through the

The heated glycol water is supplied to the after heater 104 through the fifth pipe (L5), and after heating the liquefied ammonia supplied to the engine (E) through the first pipe (L1), the sixth pipe (L6) is emitted through At this time, the glycol water flowing through the sixth pipe (L6) through heat exchange with liquefied ammonia may be cooled.

The sixth pipe (L6) is connected to the cooling pipe (202) arranged in the pressurized tank (101), the cooled glycol water of the sixth pipe (L6) is supplied to the cooling pipe (202), the pressurized tank (101) After heat exchange with ammonia is made in the inside, it is discharged through the seventh pipe (L7), and is supplied to the glycol heater 302 through the glycol pump 303 to be circulated. Through this, ammonia condensed in a liquid state in the pressure tank 101 can maintain a constant temperature.

In addition, the sixth pipe L6 may be branched into the eighth pipe L8 and connected to the return cooler 203 , and the glycol water supplied to the return cooler 203 is high-temperature liquefied ammonia discharged from the engine E. It is possible to lower the temperature of liquefied ammonia by heat exchange with At this time, the temperature of the glycol water discharged through the ninth pipe (L9) may be increased, and the glycol water discharged through the ninth pipe (L9) is transferred to the seventh pipe (L7), and the glycol pump (303) It can be supplied to the glycol heater 302 through the circulation.

5 is a configuration diagram of a fuel supply system for a ship according to another embodiment of the present invention.

Since the fuel supply system for a ship according to another embodiment of the present invention shown in FIG. 5 is mostly the same as the fuel supply system for a ship of FIG. 1, only different parts will be described in detail.

5, the fuel supply system 1001 for a ship according to another embodiment of the present invention is _{a storage tank 110 for storing ammonia (NH 3} ), between the engine (E) and the storage tank 110 . Connecting piping (L1, L2, L3, L4, L5, L6, L7, L8, L9), pressure tank 101 connected to the piping, booster pump 102, pre-heater 103, after-heater 104 ), a compressor 201 , a cooling pipe 202 , a return cooler 203 , and a glycol heater 302 .

The storage tank 110 of FIG. 5 may be an IMO type C storage tank in the form of a pressure vessel. Unlike the storage tank 100 of FIG. 1 , it may be easily installed in a vessel in the form of a pressure vessel.

In the above embodiment, the IMO type C storage tank 110 and the IMO type A storage tank 100 have been described, but the present invention is not limited thereto, and IMO type B may also be used as a storage tank for liquefied ammonia. IMO type B may include a primary barrier and a partial secondary barrier (drip tray) that covers only a portion with a relatively high probability of cracking of the primary barrier. The storage tank of IMO type B may be provided in a spherical shape or may include a prismatic shape, but is not limited thereto.

Although the technical idea of the present invention has been described by various embodiments above, the technical idea of the present invention includes various substitutions, modifications, and changes that can be made within a range that can be understood by a person of ordinary skill in the art to which the present invention belongs. include It is also intended that such substitutions, modifications and variations be included within the scope of the appended claims.

10: ammonia feed pump 100, 110: storage tank
101: pressurized tank 102: booster pump
103: pre-heater 104: after-heater
201: compressor 202: cooling pipe
203: return cooler 301: seawater pump
302: glycol heater 303: glycol pump

Claims (14)

Storage tanks (100, 110) in which liquefied ammonia is stored as fuel supplied to the marine engine (E);
A first pipe (L1) connected to the storage tanks (100, 110) for supplying fuel to the engine (E),
The pressure tank 101 connected to the first pipe (L1),
A compressor 201 installed in a third pipe L3 connecting the pressurized tank 101 and the storage tanks 100 and 110 to pressurize the BOG generated in the storage tanks 100 and 110;
A cooling pipe (202) arranged in the pressurized tank (101) and exchanging heat with ammonia in the pressurized tank (101);
After heater 104 installed in the first pipe (L1) and heating the liquefied ammonia supplied to the engine (E);
a second pipe (L2) for recovering excess ammonia discharged from the engine (E) to the pressurized tank (101);
a return cooler 203 connected to the second pipe L2 to cool the excess ammonia discharged from the engine E;
A glycol heater 302 connected to the after heater 104 and a fifth pipe L5 to supply heated glycol water to the after heater 104, and
an eighth pipe (L8) connecting between the after heater (104) and the return cooler (203);
The glycol water discharged from the after heater 104 is supplied to the return cooler 203 through the eighth pipe L8, and the excess discharged from the engine E flowing through the second pipe L2. After lowering the temperature of ammonia, it is discharged through the ninth pipe (L9), and is discharged through the ninth pipe (L9) to the seventh pipe (L7) in which the glycol pump 303 is installed, and the glycol heater (302) is transmitted to
A sixth pipe (L6) connecting between the after heater (104) and the cooling pipe (202) is further included,
The glycol water supplied through the sixth pipe (L6) passes through the cooling pipe (202) and exchanges heat with ammonia in the pressurized tank (101), and then through the seventh pipe (L7), the glycol heater supplied by (302),
Marine fuel supply system. delete delete The method of claim 1,
Doedoe connected to the first pipe (L1), further comprising a pre-heater 103 installed between the pressurized tank 101 and the after-heater 104,
Marine fuel supply system. 5. The method of claim 4,
The return cooler 203, the pre-heater 103, and the pressure control valve V are sequentially connected to the second pipe L2,
Marine fuel supply system. 6. The method of claim 5,
The pre-heater 103 exchanges heat with liquefied ammonia passing through the relatively low temperature first pipe L1 and the relatively high temperature second pipe L2 with liquefied ammonia passing through the first pipe L1. raising the temperature of liquefied ammonia,
Marine fuel supply system. delete delete delete delete The method of claim 1,
Further comprising a seawater pump 301 connected to the glycol heater 302 by a fourth pipe (L4) and supplying seawater for heating the glycol water supplied to the glycol heater 302,
Marine fuel supply system. 12. The method of claim 11,
Further comprising an additional heat source for raising the temperature of the glycol water,
Marine fuel supply system. The method of claim 1,
The storage tank (100, 110) is any one of IMO type A, IMO type B and IMO type C,
Marine fuel supply system. A vessel equipped with a fuel supply system according to claim 1 , 4 , 5 , 6 , 11 , 12 or 13 .

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