WO2023162325A1 - Floating body - Google Patents

Abstract

This floating body comprises: a fuel tank in which ammonia is stored; a first pressure tank in which the ammonia is stored in a pressurized state; a supply line through which the ammonia is derived from the first pressure tank; a booster pump which boosts the pressure of the ammonia flowing through the supply line; an engine to which the ammonia is supplied as fuel via the supply line; a first return line through which the ammonia having passed through the engine is returned to the first pressure tank; a first pressure regulating valve which is provided to the first return line and is capable of regulating the pressure of the ammonia in the engine; a cooling part which is provided to the downstream side of the first pressure regulating valve in the first return line and which cools the ammonia; and a pressure retaining part for retaining the ammonia present between the cooling part and the first pressure regulating valve in the first return line at a pressure that is lower than the pressure of the ammonia in the engine and that allows the ammonia to be maintained in a liquid state.

Description

floating body

The present disclosure relates to floating bodies.
This application claims priority based on Japanese Patent Application No. 2022-027495 filed in Japan on February 25, 2022 and Japanese Patent Application No. 2022-105488 filed in Japan on June 30, 2022. and its contents are incorporated herein.

Patent Literature 1 discloses a fuel supply system for ships including a supply line for supplying liquefied ammonia stored in an ammonia storage tank to a main engine, and a return line for returning the liquefied ammonia from the main engine to the ammonia storage tank. disclosed. In Patent Literature 1, liquefied ammonia returned from the main engine is cooled by a heat exchanger and pressure-reduced by a first Joule-Thomson valve before being returned to the ammonia storage tank.

Japanese Utility Model Registration No. 3234399

In the technique described in Patent Document 1, since the liquefied ammonia returned from the main engine is cooled by a heat exchanger before it is lowered in pressure, a heat exchanger with high pressure resistance performance is required, making it difficult to reduce costs. There is a problem of becoming In addition, depending on the pressure of the ammonia storage tank, gas-liquid mixture occurs after the first Joule-Thomson valve, which may cause erosion in the piping.
The present disclosure has been made in view of the above circumstances, and by handling the ammonia in the pipes in a liquid phase instead of a gas-liquid mixture, it is possible to suppress the occurrence of problems such as thinning due to erosion. To provide a floating body capable of achieving cost reduction by using a cooling part with a low cooling rate.

In order to solve the above problems, the following configuration is adopted.
According to the first aspect of the present disclosure, the floating body includes a floating body main body, a fuel tank provided in the floating body main body and storing ammonia, and a first fuel tank in which the ammonia from the fuel tank is stored in a pressurized state A pressurized tank, a supply line through which the ammonia is led out from the first pressurized tank, a booster pump that pressurizes the ammonia flowing through the supply line, and the ammonia is supplied as fuel via the supply line. an engine, a first return line that returns the ammonia that has passed through the engine to the first pressurized tank, and a first pressure regulator that is provided in the first return line and capable of regulating the pressure of the ammonia in the engine. a cooling section provided downstream of the first pressure regulating valve in the first return line to cool the ammonia; and between the first pressure regulating valve and the cooling section in the first return line. a pressure holding unit that holds the pressure of the ammonia in the engine to a pressure that is lower than the pressure of the ammonia in the engine and that can maintain the ammonia in a liquid state.

According to the floating body according to the present disclosure, the ammonia in the pipe is handled in a liquid phase instead of a gas-liquid mixture, thereby suppressing the occurrence of problems such as thinning due to erosion, and using a cooling part with low pressure resistance. It is possible to reduce the cost by doing things.

1 is a side view of a floating body according to a first embodiment of the present disclosure; FIG. 1 is a diagram showing a schematic configuration of an ammonia fuel supply system according to a first embodiment of the present disclosure; FIG. FIG. 3 is a diagram corresponding to FIG. 2 in the second embodiment of the present disclosure; FIG. 3 is a diagram corresponding to FIG. 3 in the third embodiment of the present disclosure; FIG. 5 is a diagram corresponding to FIG. 4 in a modification of the third embodiment of the present disclosure; It is a figure corresponding to FIG. 4 in the fourth embodiment of the present disclosure. FIG. 6 is a diagram corresponding to FIG. 5 in a modification of the fourth embodiment of the present disclosure; It is a figure corresponding to FIG. 4 in the fifth embodiment of the present disclosure. FIG. 6 is a diagram corresponding to FIG. 5 in a modification of the fifth embodiment of the present disclosure;

[First embodiment]
A floating body according to a first embodiment of the present disclosure will be described below with reference to the drawings. 1 is a side view of a floating body according to the first embodiment of the present disclosure; FIG.
(Structure of floating body)
As shown in FIG. 1, the floating body 1 of this embodiment includes a floating body body 2, an upper structure 4, a combustion device (engine) 8, an ammonia tank 10, an ammonia fuel supply system 20, and a fuel supply device chamber 30. and have. Note that the floating body 1 of the present embodiment will be described as an example of a vessel that can be navigated by a main engine or the like. The ship type of the floating body 1 is not limited to a specific ship type. Examples of ship types of the floating body 1 include liquefied gas carriers, ferries, RORO ships, car carriers, and passenger ships.

The floating body body 2 has a pair of shipboard sides 5A and 5B and a ship bottom 6 that form its outer shell. The shipboard sides 5A, 5B are provided with a pair of shipboard skins forming the starboard and port sides, respectively. The ship's bottom 6 includes a ship's bottom shell plate that connects the sides 5A and 5B. The pair of sides 5A and 5B and the ship bottom 6 form a U-shaped outer shell of the floating body 2 in a cross section perpendicular to the fore-aft direction FA.

The floating body body 2 further includes an upper deck 7 which is a through deck arranged in the uppermost layer. The superstructure 4 is formed on this upper deck 7 . A living quarter and the like are provided in the upper structure 4 . In the floating body 1 of this embodiment, for example, a cargo space (not shown) for loading cargo is provided closer to the bow 3a in the bow-stern direction FA than the superstructure 4 is.

The combustion device 8 is a device that generates thermal energy by burning fuel, and is provided inside the floating body main body 2 described above. Examples of the combustion device 8 include an internal combustion engine used as a main engine for propelling the floating body 1, an internal combustion engine used for power generation equipment that supplies electricity to the ship, a boiler that generates steam as a working fluid, and the like. The combustion device 8 of this embodiment can use at least ammonia as fuel. Note that the combustion device 8 may be configured to be able to switch between ammonia and another fuel such as light oil, which is different from ammonia.

The ammonia tank (fuel tank) 10 is a tank that stores liquid ammonia (in other words, liquefied ammonia). In this embodiment, the case where the ammonia tank 10 is installed on the upper deck 7 closer to the stern 3b than the superstructure 4 is illustrated. Further, the ammonia tank 10 of the present embodiment stores liquefied ammonia as fuel for the combustion device 8 .

The ammonia fuel supply system 20 connects the combustion device 8 and the ammonia tank 10 and is configured to be able to supply at least ammonia stored in the ammonia tank 10 to the combustion device 8 .

The fuel supply device room 30 is a compartment that houses ammonia fuel equipment that constitutes part of the ammonia fuel supply system 20 . Although the fuel supply device chamber 30 of this embodiment is provided on the upper deck 7 on the bow 3a side of the superstructure 4, the arrangement of the fuel supply device chamber 30 is is not limited to the upper deck 7 on the bow 3a side. The ammonia fuel supply system 20 described above connects the combustion device 8 and the ammonia tank 10 via the fuel supply device chamber 30 .

FIG. 2 is a diagram showing a schematic configuration of an ammonia fuel supply system according to the first embodiment of the present disclosure;
As shown in FIG. 2, the ammonia fuel supply system 20 of the first embodiment includes a fuel tank lead-out line 41, a low pressure pump 42, a first heat exchanger 43, a first pressurized tank 44, a supply line 45 , booster pump 46, first return line 47, first pressure regulating valve 48, first pressure sensor 49, first flow sensor 50, second heat exchanger (cooling unit) 51, second A pressure regulating valve (pressure holding portion) 52, a second pressure sensor 53, a first liquid level adjusting portion 54, a first inert gas supply portion 55, a first gas release portion 56, and a fuel tank return line 57. , a flow control valve 58 , a supply return line 59 , a third pressure control valve 60 and a third pressure sensor 61 . Although illustration is omitted, the ammonia fuel supply system 20 is separately connected to an inert gas supply device or the like for purging the fuel.

The fuel tank lead-out line 41 leads liquefied ammonia (hereinafter simply referred to as ammonia) from the ammonia tank 10 toward the first pressurized tank 44 . The fuel tank lead-out line 41 communicates the liquid phase of the ammonia tank 10 and the first pressurized tank 44 .
The low-pressure pump 42 is provided in the fuel tank lead-out line 41 to pressurize (for example, about 2.5 MPa) the ammonia in the ammonia tank 10 and send it out toward the first pressurization tank 44 . The low-pressure pump 42 may be of a so-called deep well type or a submerged type that is directly installed in the tank.

The first heat exchanger 43 is provided in the fuel tank lead-out line 41 and controls the temperature of the ammonia pressurized by the low-pressure pump 42 . In this embodiment, for example, ammonia is heated up to about 40°C.

The first pressurized tank 44 stores ammonia introduced from the ammonia tank 10 in a pressurized state. The first pressurized tank 44 of this embodiment is in a pressurized state with a pressure slightly lower (for example, about 2.3 MPa) than the ammonia immediately after being pressurized by the low-pressure pump 42, for example.

A supply line 45 leads ammonia from the first pressurized tank 44 . A supply line 45 supplies liquid-phase ammonia in the first pressurized tank 44 to the combustion device 8 .
The booster pump 46 is provided in the supply line 45 and boosts the pressure of the ammonia drawn out from the first pressurization tank 44 . The boosting pump 46 can boost the ammonia flowing through the supply line 45 to a pressure higher than that required by the combustion device 8 .

A first return line 47 returns ammonia that has passed through the combustion device 8 to the first pressurized tank 44 . In other words, the first return line 47 is a line that returns to the first pressurization tank 44 the excess ammonia that has not been burned in the combustion device 8 out of the ammonia supplied to the combustion device 8 through the supply line 45 . A first return line 47 in this embodiment returns the ammonia that has passed through the combustion device 8 to the first pressurized tank 44 .

The first pressure sensor 49 detects the pressure of ammonia flowing in the first return line 47 closer to the combustion device 8 than the first pressure regulating valve 48 is. A detection result of the first pressure sensor 49 is input to the first pressure regulating valve 48 .
The first flow rate sensor 50 detects the flow rate of ammonia flowing through the side of the first return line 47 closer to the pressurized tank than the first pressure regulating valve 48 . A detection result of the first flow sensor 50 is input to the first pressure regulating valve 48 .

A first pressure regulating valve 48 is provided in the first return line 47 so that the pressure of ammonia in the combustion device 8 can be adjusted. The pressure of ammonia inside the combustion device 8 is maintained at a predetermined pressure (for example, about 8 MPa) required inside the combustion device 8 by adjusting the degree of opening of the first pressure regulating valve 48 . That is, the booster pump 46 boosts the ammonia to a predetermined pressure or more required in the combustion device 8, and the first pressure regulating valve 48, based on the detection result of the first pressure sensor 49, The valve opening degree is increased when the ammonia pressure in the combustion device 8 is high, while the valve opening degree is decreased when the ammonia pressure in the combustion device 8 is low. Also, the first pressure regulating valve 48 determines that the flow rate of ammonia flowing through the first return line 47 reaches a predetermined lower limit based on the detection result of the first flow rate sensor 50 regardless of the detection result of the first pressure sensor 49. The valve opening is adjusted to exceed By setting the flow rate of ammonia above the predetermined lower limit value in this way, for example, ammonia is prevented from being overheated, and components in the combustion device 8 are prevented from being overheated.

The second heat exchanger 51 is provided downstream of the first pressure regulating valve 48 in the first return line 47 . A second heat exchanger 51 cools the ammonia flowing through the first return line 47 . More specifically, the ammonia flowing through the first return line 47 is cooled to a temperature at which it remains liquid and does not vaporize when returned to the first pressurized tank 44 . Here, in the first pressurized tank 44 of the present embodiment, as described above, ammonia is stored at about 2.3 MPa, and the second heat exchanger 51 stores ammonia at a temperature of 45° C. or less at which ammonia does not vaporize under this pressure. is cooling.

The second pressure sensor 53 detects the pressure of ammonia flowing through the first return line 47 between the first pressure regulating valve 48 and the second pressure regulating valve 52 . A detection result of the second pressure sensor 53 is input to the second pressure regulating valve 52 .

The second pressure regulating valve 52 is provided between the second heat exchanger 51 of the first return line 47 and the first pressurized tank 44 . The second pressure regulating valve 52 is capable of regulating the pressure of ammonia flowing at least between the first pressure regulating valve 48 in the first return line 47 and the second heat exchanger 51 . The second pressure regulating valve 52 of this embodiment adjusts the pressure in the first return line 47 between the first pressure regulating valve 48 and the second pressure regulating valve 52 based on the detection result of the second pressure sensor 53. , at a pressure lower than the pressure of the ammonia in the combustion device 8 and capable of maintaining the ammonia in a liquid state. More specifically, the second pressure regulating valve 52 , at the ammonia temperature (eg, 70° C.) immediately after flowing through the first return line 47 from the combustion device 8 and passing through the first pressure regulating valve 48 , The pressure is adjusted to maintain the liquid state (for example, about 3.25 MPa).

The first liquid level adjuster 54 maintains the liquid level of the first pressure tank 44 within a predetermined range. The first liquid level adjusting section 54 includes a first liquid level detecting section 62 and a first liquid level adjusting valve 63 .
The first liquid level detector 62 detects the liquid level of the first pressurized tank 44 . The detection result of the first liquid level detector 62 is input to the first liquid level adjustment valve 63 .
The first liquid level adjustment valve 63 adjusts the valve opening degree based on the detection result of the first liquid level detection unit 62, thereby adjusting the flow rate of ammonia flowing from the ammonia tank 10 into the first pressurization tank 44. .

The first inert gas supply unit 55 supplies inert gas into the first pressurized tank 44 . The first inert gas supply unit 55 supplies the first pressurized tank 44 with the same pressure as the pressure in the first pressurized tank 44 (eg, 2.3 MPa) or a slightly higher pressure (eg, 2.35 MPa). etc.) can be supplied. For example, when the pressure in the first pressurized tank 44 drops too much due to a decrease in the liquid level of the first pressurized tank 44, the first inert gas supply unit 55 supplies the first pressurized tank 44 with Inert gas is supplied inside the first pressurization tank 44 so that the pressure drop in the first pressurization tank 44 does not occur. As a result, the inert gas supplied by the first inert gas supply section 55 is stored in the gas phase in the first pressurized tank 44 .

The first gas discharge part 56 discharges the vapor-phase gas in the first pressurized tank 44 to the outside of the first pressurized tank 44 . The first gas discharge part 56 of the present embodiment, for example, when the pressure in the first pressurization tank 44 rises too much (for example, 2.36 2.8 MPa), the vapor-phase gas in the first pressurization tank 44 is released to the atmosphere. That is, the pressure in the first pressurization tank 44 is maintained within a predetermined pressure range by the first inert gas supply section 55 and the first gas discharge section 56 .

The fuel tank return line 57 is a line that diverts the ammonia flowing through the fuel tank lead-out line 41 toward the first pressurization tank 44 and returns it to the ammonia tank 10 .
A flow control valve 58 is provided in the fuel tank return line 57 to control the flow rate of ammonia flowing through the fuel tank return line 57 . For example, when the liquid level of the first pressurization tank 44 reaches a predetermined upper limit, surplus ammonia is returned to the ammonia tank 10 by the fuel tank return line 57 and the flow control valve 58 . If the low-pressure pump 42 is a variable flow type pump, the fuel tank return line 57 and the flow control valve 58 may be omitted.

The supply return line 59 is branched to the supply line 45 and joined to the fuel tank lead-out line 41 between the first liquid level control valve 63 and the first heat exchanger 43 . That is, the supply return line 59 returns the ammonia flowing through the supply line 45 to the first pressurized tank 44 via the first heat exchanger 43 .
A third pressure sensor 61 detects the pressure in the supply return line 59 . A detection result of the third pressure sensor 61 is input to the third pressure regulating valve 60 . The third pressure sensor 61 may detect the pressure in the supply line 45 closer to the combustion device 8 than the boost pump 46 .

A third pressure regulating valve 60 is provided in the supply return line 59 . The third pressure regulating valve 60 can adjust the flow rate of ammonia flowing through the supply return line 59 . In other words, the third pressure regulating valve 60 allows the ammonia to escape through the supply return line 59, thereby regulating the pressure in the supply line 45 closer to the combustion device 8 than the boost pump 46 in the supply line 45. . Based on the detection result of the third pressure sensor 61, the third pressure regulating valve 60 of this embodiment keeps the pressure in the supply line 45 closer to the combustion device 8 than the boost pump 46 to a predetermined pressure or less. do. In this embodiment, the third pressure regulating valve 60 is used as a valve for releasing ammonia in order to prevent overpressure in the supply line 45, and the pressure of the ammonia supplied to the combustion device 8 is controlled by the first pressure regulating valve 48. Although the case of adjustment has been described, the third pressure adjustment valve 60 may be used to adjust the pressure of ammonia supplied to the combustion device 8 . Further, the boosting pump 46 may be equipped with an inverter to have a function of adjusting the discharge pressure.

(Effect)
According to the floating body 1 of the first embodiment, the first pressure regulating valve 48 provided in the first return line 47 can bring the fuel in the combustion device 8 to the required pressure. Further, even if the ammonia flowing through the first return line 47 is decompressed downstream of the first pressure regulating valve 48, the second pressure regulating valve 52 can easily maintain the pressure at which the liquid state can be maintained. can. Therefore, while disposing the second heat exchanger 51 (cooling section) downstream of the first pressure regulating valve 48 having a low pressure, ammonia is generated between the first pressure regulating valve 48 and the second heat exchanger 51. Evaporation can be suppressed. Therefore, it is possible to suppress the occurrence of troubles such as erosion by handling the ammonia in the pipe in a liquid phase instead of a gas-liquid mixture state, and it is possible to use the second heat exchanger 51 with low pressure resistance. Cost reduction can be achieved.

Furthermore, in the above-described first embodiment, the first liquid level detection unit 62 that detects the liquid level in the first pressurization tank 44 and the first Since the liquid level adjusting valve 63 is provided, the liquid level in the first pressurized tank 44 can be easily maintained within a predetermined liquid level range according to load fluctuations of the combustion device 8 or the like. As a result, it is possible to prevent air bubbles from entering the supply line 45 .

[Second embodiment]
Next, a second embodiment of the present disclosure will be described based on the drawings. The floating body of this second embodiment is obtained by adding a second pressurized tank 70 to the first embodiment described above. Therefore, referring to FIG. 1 of the first embodiment, the same parts as in the above-described first embodiment are denoted by the same reference numerals, and overlapping descriptions are omitted.

The floating body 101 in this second embodiment includes a floating body body 2, an upper structure 4, a combustion device 8, an ammonia tank 10, an ammonia fuel supply system 20, and a fuel supply device chamber 30.

FIG. 3 is a diagram corresponding to FIG. 2 in the second embodiment of the present disclosure.
As shown in FIG. 3, the ammonia fuel supply system 20 of the second embodiment includes a fuel tank lead-out line 41, a low pressure pump 42, a first heat exchanger 43, a first Pressure tank 44, supply line 45, booster pump 46, first return line 47, first pressure regulating valve 48, first pressure sensor 49, first flow sensor 50, second heat exchanger ( cooling unit) 51, second pressure regulating valve (pressure holding unit) 52, second pressure sensor 53, first liquid level detecting unit 62, first liquid level regulating valve 63, and first inert gas supply a portion 55, a first gas release portion 56, a fuel tank return line 57, a flow control valve 58, a supply return line 59, a third pressure control valve 60, and a third pressure sensor 61. . Furthermore, in addition to the above, the ammonia fuel supply system 20 of the second embodiment includes a second pressurized tank 70, a second inert gas supply unit 71, a second gas release unit 72, and a second liquid level adjustment A portion 73 , a bypass line 74 , a first switching valve 75 and a second switching valve 76 are provided.

The second pressurized tank 70 is provided in the first return line 47 between the second heat exchanger 51 and the first pressurized tank 44 . The second pressurized tank 70 can store ammonia flowing through the first return line 47 . The second pressurized tank 70 has a liquid phase and a gas phase inside. Of the first return line 47 , an upstream line 47</b>A on the upstream side of the second pressurization tank 70 communicates with the second pressurization tank 70 . Further, of the first return line 47 , a downstream line 47</b>B on the downstream side of the second pressurization tank 70 communicates with the liquid phase of the second pressurization tank 70 .

The second inert gas supply unit 71 supplies inert gas into the second pressurized tank 70 . The second inert gas supply unit 71 supplies the second pressurized tank 70 with the same pressure as the pressure in the second pressurized tank 70 (eg, 2.5 MPa) or a slightly higher pressure (eg, 2.55 MPa). etc.) can be supplied. For example, when the pressure in the second pressurized tank 70 drops too much due to a decrease in the liquid level of the second pressurized tank 70, the second inert gas supply unit 71 supplies the second pressurized tank 70 with An inert gas is supplied inside the second pressurization tank 70 so that the pressure drop in the second pressurization tank 70 does not occur. As a result, the inert gas supplied by the second inert gas supply section 71 is stored in the vapor phase inside the second pressurized tank 70 .

The second gas discharge part 72 discharges the vapor-phase gas in the second pressurization tank 70 to the outside of the second pressurization tank 70 . The second gas discharge part 72 of the present embodiment, for example, when the pressure in the second pressurization tank 70 rises too much (for example, 3.0 MPa ), the vapor-phase gas in the second pressurization tank 70 is released to the atmosphere. That is, the second inert gas supply section 71 and the second gas discharge section 72 maintain the pressure in the second pressurization tank 70 within a predetermined pressure range.

The second liquid level adjuster 73 maintains the liquid level of the second pressurized tank 70 within a predetermined range. The second liquid level adjusting section 73 includes a second liquid level detecting section 77 and a second liquid level adjusting valve 78 .
The second liquid level detector 77 detects the liquid level of the second pressurization tank 70 . The detection result of the second liquid level detector 77 is input to the second liquid level adjustment valve 78 .
The second liquid level adjustment valve 78 adjusts the valve opening degree based on the detection result of the second liquid level detector 77 , so that the liquid is discharged from the second pressurized tank 70 through the downstream line 47 B of the first return line 47 . Adjust the flow rate of ammonia to be discharged.

The bypass line 74 is a line that bypasses the second pressurized tank 70 and allows the ammonia flowing through the upstream line 47A to flow into the downstream line 47B.
The first switching valve 75 is provided in the upstream line 47A. More specifically, the first switching valve 75 is provided in the upstream line 47</b>A closer to the second pressurized tank 70 than the branch point of the bypass line 74 . The first switching valve 75 is always open, and is closed when an abnormality occurs, such as when the liquid level adjustment function of the second pressurization tank 70 fails.
A second switching valve 76 is provided in the bypass line 74 . The second switching valve 76 is normally closed, and is opened when an abnormality occurs as described above. That is, the first switching valve 75 and the second switching valve 76 make it possible to switch the destination of the ammonia flowing through the upstream line 47A to either the second pressurized tank 70 or the bypass line 74. ing.

(Effect)
According to the floating body 101 of the second embodiment, in addition to the effects of the first embodiment, since the second pressurized tank 70 is provided in the middle of the first return line 47, maintenance, fuel switching, etc. When purging ammonia from the fuel system, the second pressurized tank 70 can recover liquid ammonia. Moreover, since the amount of the purge gas which flows into the 1st pressurization tank 44 can be reduced in that case, the capacity|capacitance of the 1st pressurization tank 44 can be reduced.

Furthermore, since the gas phase can be formed in the second pressurization tank 70 by the second inert gas supply unit 71, it is possible to suppress the inclusion of air bubbles in the liquid phase. In addition, since the inert gas can be supplied into the second pressurized tank 70 by the second inert gas supply unit 71, it is possible to prevent the pressure in the second pressurized tank 70 from decreasing and the liquid ammonia from vaporizing. can.

Further, in the second embodiment, the second liquid level detection unit 77 that detects the liquid level in the second pressurization tank 70, and the ammonia discharged from the second pressurization tank 70 through the first return line 47 and a second liquid level control valve 78 that adjusts the flow rate of the second pressurized liquid ammonia flowing into the second pressurized tank 70 according to the load fluctuation of the combustion device 8 Even if the flow rate of liquid ammonia discharged from the tank 70 fluctuates, the liquid level in the second pressurized tank 70 can be easily maintained within a predetermined liquid level range.

[Third Embodiment]
Next, a third embodiment of the present disclosure will be described based on the drawings. The floating body of this third embodiment is different in that a canned motor pump is used as the booster pump of the above-described second embodiment. Therefore, referring to FIG. 1 of the first embodiment, the same parts as in the above-described first embodiment are denoted by the same reference numerals, and overlapping descriptions are omitted.

The floating body 201 in this third embodiment includes a floating body body 2, an upper structure 4, a combustion device 8, an ammonia tank 10, an ammonia fuel supply system 20, and a fuel supply device chamber 30.

FIG. 4 is a diagram corresponding to FIG. 3 in the third embodiment of the present disclosure.
As shown in FIG. 4, the ammonia fuel supply system 20 of the third embodiment includes a fuel tank lead-out line 41, a low pressure pump 42, a first heat exchanger 43, a first pressurized tank 44, a supply line 45 , canned motor pump 146, second return line 80, first return line 47, first pressure regulating valve 48, first pressure sensor 49, first flow sensor 50, second heat exchanger ( cooling unit) 51, second pressure regulating valve (pressure holding unit) 52, second pressure sensor 53, first liquid level detecting unit 62, first liquid level regulating valve 63, and first inert gas supply portion 55, first gas release portion 56, fuel tank return line 57, flow control valve 58, supply return line 59, third pressure control valve 60, third pressure sensor 61, second pressurization A tank 70, a second inert gas supply unit 71, a second gas release unit 72, a second liquid level adjustment unit 73, a bypass line 74, a first switching valve 75, a second switching valve 76, It has

The canned motor pump 146 is provided in the supply line 45 and pressurizes the ammonia drawn out from the first pressurized tank 44, like the booster pump 46 of the first embodiment. The canned motor pump 146 is capable of boosting the ammonia flowing through the supply line 45 to a pressure higher than that required by the combustion device 8 . The canned motor pump 146 is a type of pump in which a pump body (not shown) and a motor portion (not shown) are integrally formed and which does not have a shaft seal. This canned motor pump 146 uses part of the ammonia flowing through the supply line 45 as a coolant for the motor section.

A second return line 80 is a line for returning part of the ammonia used as a coolant in the canned motor pump 146 to the gas phase of the first pressure tank 44 .
When the temperature of the ammonia used as the coolant in the canned motor pump 146 is higher than the upper limit temperature of the ammonia stored in the first pressurization tank 44, the second return line 80 is connected to the third heat exchanger. 81 may be provided to cool the temperature of the ammonia flowing through the second return line 80 to below the above upper temperature limit.

(Effect)
In the third embodiment, since the canned motor pump 146 is used, ammonia leakage from the shaft seal does not occur, so reliability can be improved. Furthermore, since a gas phase can be formed in the first pressurized tank 44 by the first inert gas supply unit 55, the ammonia used as the cooling liquid for the canned motor pump 146 can be transferred to a place away from the canned motor pump 146. There is no need to return to a tank with a gas phase such as a fuel tank installed in the Therefore, even if the ammonia used as the coolant for the canned motor pump 146 is contaminated with oil or the like, the ammonia outside the fuel supply system of the combustion device 8 can be prevented from being contaminated. In addition, since the gas phase is formed in the first pressurization tank 44, it is possible to prevent air bubbles from entering the liquid phase of ammonia. In addition, by supplying the inert gas into the first pressurization tank 44, it is possible to prevent the pressure in the first pressurization tank 44 from decreasing and evaporating liquid ammonia.

(Modified example of the third embodiment)
FIG. 5 is a diagram corresponding to FIG. 4 in a modification of the third embodiment of the present disclosure.
In the third embodiment described above, the case where one canned motor pump 146 is provided as the boosting pump has been described as an example. However, the number of boost pumps for boosting the ammonia flowing through the supply line 45 is not limited to one.

For example, like the floating body of the modification of the third embodiment shown in FIG. In this modification of the third embodiment, a first canned motor pump 246A and a second canned motor pump 246B are provided as two booster pumps. Furthermore, in the floating body of the modified example of the third embodiment, a second return line 80 that returns part of the ammonia used as the coolant in the first canned motor pump 246A to the gas phase of the first pressurization tank 44, and a third return line 280 that returns a portion of the ammonia used as coolant in the second canned motor pump 246B to the vapor phase of the first pressurized tank 44 .

According to the modified example of the third embodiment, even if the ammonia pressure required by the combustion device 8 differs, for example, depending on the manufacturer, the ammonia pressure required by the combustion device 8 can be increased by adding or removing boost pumps. pressure can be increased. Furthermore, since a plurality of booster pumps are provided in series, the canned motor pump is less expensive than a single pump that boosts the ammonia flowing through the supply line 45 to a pressure higher than that required by the combustion device 8. can be used to reduce costs.

As in the above-described third embodiment, when the temperature of the ammonia returned from the first and second canned motor pumps 246A, 246B to the gas phase of the first pressurization tank 44 is high, the second A third heat exchanger 81 may be provided in the second return line 80 or a fourth heat exchanger 281 may be provided in the third return line 280 to cool the ammonia. A fifth heat exchanger 85 may be provided to cool the ammonia discharged from the second canned motor pump 246B. In situations where the fifth heat exchanger 85 is provided, the above-described first heat exchanger 43 may be omitted.

Also, in the modified example of the third embodiment, the case where two booster pumps are provided has been described, but three or more booster pumps may be provided. Furthermore, in the supply line 45 of the first embodiment, a plurality of booster pumps may be provided in series.

[Fourth embodiment]
Next, a fourth embodiment of the present disclosure will be described based on the drawings. The floating body of the fourth embodiment differs from the above-described third embodiment in that a return destination for part of the ammonia used as the coolant in the canned motor pump is added. Therefore, referring to FIG. 1 of the first embodiment, the same parts as those of the above-described third embodiment are given the same reference numerals, and overlapping descriptions are omitted.

A floating body 301 in the fourth embodiment includes a floating body body 2, an upper structure 4, a combustion device 8, an ammonia tank 10, an ammonia fuel supply system 20, and a fuel supply device chamber 30.

FIG. 6 is a diagram corresponding to FIG. 4 in the fourth embodiment of the present disclosure.
As shown in FIG. 6, the ammonia fuel supply system 20 of the fourth embodiment includes a fuel tank lead-out line 41, a low pressure pump 42, a first heat exchanger 43, a first pressurized tank 44, a supply line 45 , canned motor pump 146 , second return line 80 , fourth return line 180 (second pressurized tank return line), third switching valve 91 , fourth switching valve 92 , first return line 47 , the first pressure regulating valve 48, the first pressure sensor 49, the first flow sensor 50, the second heat exchanger (cooling section) 51, the second pressure regulating valve (pressure holding section) 52, the Two pressure sensors 53, a first liquid level detection unit 62, a first liquid level adjustment valve 63, a first inert gas supply unit 55, a first gas discharge unit 56, a fuel tank return line 57, and a flow rate Regulating valve 58 , supply return line 59 , third pressure regulating valve 60 , third pressure sensor 61 , second pressurized tank 70 , second inert gas supply section 71 , and second gas release section 72 , a second liquid level adjustment unit 73 , a bypass line 74 , a first switching valve 75 , and a second switching valve 76 .

The canned motor pump 146 has the same configuration as the canned motor pump 146 of the third embodiment, and is provided in the supply line 45 to pressurize the ammonia drawn out from the first pressurization tank 44 . Canned motor pump 146 uses a portion of the ammonia flowing through supply line 45 as a coolant for the motor section.

A second return line 80 is a line for returning part of the ammonia used as a coolant in the canned motor pump 146 to the gas phase of the first pressure tank 44 .
The fourth return line 180 is a line that returns part of the ammonia used as the coolant in the canned motor pump 146 to the vapor phase of the second pressurization tank 70 .

The third switching valve 91 adjusts the flow rate of ammonia flowing through the second return line 80 . The fourth switching valve 92 adjusts the flow rate of ammonia flowing through the fourth return line 180 . These third switching valve 91 and fourth switching valve 92 are configured to be freely openable and closable from fully open to fully closed. A part of the ammonia used as the coolant in the canned motor pump 146 can be distributed to the first pressurization tank 44 and the second pressurization tank 70 by the third switching valve 91 and the fourth switching valve 92 . It's becoming For example, by opening the third switching valve 91 and closing the fourth switching valve 92, part of the ammonia used as the coolant in the canned motor pump 146 is transferred to the gas phase of the first pressurized tank 44. can be returned to On the other hand, by closing the third switching valve 91 and opening the fourth switching valve 92, part of the ammonia used as the coolant in the canned motor pump 146 is transferred to the gas in the second pressurization tank 70. can be reversed.

In the present embodiment, the case where the second return line 80 is provided with the third switching valve 91 and the fourth return line 180 is provided with the fourth switching valve 92 is exemplified, but the configuration is not limited to this. . Any configuration may be employed as long as a portion of the ammonia used as the coolant in the canned motor pump 146 can be distributed between the first pressurization tank 44 and the second pressurization tank 70 . Further, although the case where the third switching valve 91 and the fourth switching valve 92 are capable of adjusting the flow rate has been described, valves that can only be opened and closed may be used. In this case, the return destination of part of the ammonia used as the cooling liquid in the canned motor pump 146 is alternatively selected from the first pressurization tank 44 and the second pressurization tank 70 .

When the temperature of the ammonia used as the coolant in the canned motor pump 146 is higher than the upper limit temperature of the ammonia stored in the first pressurization tank 44 or the second pressurization tank 70, the second return line 80 is provided with a third heat exchanger 81 to cool the temperature of the ammonia flowing through the second return line 80 to be lower than the upper limit temperature, or a sixth heat exchanger 93 is provided in the fourth return line 180. It may be provided to cool the temperature of the ammonia flowing through the fourth return line 180 to be lower than the above upper limit temperature.

(Effect)
In the fourth embodiment, in addition to the effects of the third embodiment, the ammonia used as the cooling liquid for the canned motor pump 146 is It is possible to selectively return to

(Modified example of the fourth embodiment)
FIG. 7 is a diagram corresponding to FIG. 5 in a modification of the fourth embodiment of the present disclosure.
In the fourth embodiment described above, the case where one canned motor pump 146 is provided as a boosting pump has been described as an example. However, the number of boost pumps for boosting the ammonia flowing through the supply line 45 is not limited to one.

For example, like the floating body of the modification of the fourth embodiment shown in FIG. This modification of the fourth embodiment includes a first canned motor pump 246A and a second canned motor pump 246B as two booster pumps. Furthermore, in the floating body of the modification of the fourth embodiment, the ammonia used as the coolant for the canned motor pump 246A is selected for the first pressurization tank 44 and the second pressurization tank 70 in which the gas phase is formed. In order to return the It has

Furthermore, in the floating body of the modification of the fourth embodiment, the ammonia used as the cooling liquid for the second canned motor pump 246B is stored in the first pressurization tank 44 and the second pressurization tank 70 in which the gas phase is formed. A third return line 280, a fifth return line 380 (second pressurized tank return line), a fifth switching valve 94, and a sixth switching valve 95 are provided to selectively return to .

The third return line 280 is a line that returns part of the ammonia used as coolant in the second canned motor pump 246B to the gas phase of the first pressurization tank 44 .
The fifth return line 380 is a line that returns part of the ammonia used as the coolant in the second canned motor pump 246B to the vapor phase of the second pressurization tank 70 .

The fifth switching valve 94 adjusts the flow rate of ammonia flowing through the third return line 280 . The sixth switching valve 95 adjusts the flow rate of ammonia flowing through the fifth return line 380 . These fifth switching valve 94 and sixth switching valve 95 are configured to be freely openable and closable from fully open to fully closed. A part of the ammonia used as the coolant in the canned motor pump 246B can be distributed to the first pressurization tank 44 and the second pressurization tank 70 by the fifth switching valve 94 and the sixth switching valve 95. It's becoming For example, by opening the fifth switching valve 94 and closing the sixth switching valve 95, part of the ammonia used as the coolant in the canned motor pump 246B is transferred to the gas phase of the first pressurization tank 44. can be returned to On the other hand, by closing the fifth switching valve 94 and opening the sixth switching valve 95, part of the ammonia used as the coolant in the canned motor pump 246B is transferred to the gas in the second pressurization tank 70. can be reversed.

(Effect)
According to the modified example of the fourth embodiment, even if the ammonia pressure required by the combustion device 8 differs, for example, depending on the manufacturer, by adding or removing the boost pump, the ammonia pressure required by the combustion device 8 can be increased. pressure can be increased. Furthermore, since a plurality of booster pumps are provided in series, the canned motor pump is less expensive than a single pump that boosts the ammonia flowing through the supply line 45 to a pressure higher than that required by the combustion device 8. can be used to reduce costs.
Further, in the modification of the fourth embodiment, the ammonia used as the cooling liquid for the first canned motor pump 246A and the second canned motor pump 246B is used in the first pressurization tank 44 and the second It becomes possible to distribute and return to the pressurized tank 70 .

Note that, similarly to the modification of the third embodiment described above, the temperature of ammonia returned from the first and second canned motor pumps 246A and 246B to the gas phase of the first pressurization tank 44 and the second pressurization tank 70 is high. In some cases, the second return line 80 may be provided with a third heat exchanger 81, the third return line 280 may be provided with a fourth heat exchanger 281, and the fourth return line 180 may be provided with a sixth heat exchanger. A second return line 80, a third return line 280, a fourth return line 180, and a fifth return line 380 are respectively provided with an exchanger 93 and a fifth return line 380 with a seventh heat exchanger 96. may be cooled. Also, in the modified example of the fourth embodiment, the case where two canned motor pumps are provided has been described, but three or more canned motor pumps may be provided. In this case, ammonia may be selectively returned from each canned motor pump to the first pressurized tank 44 and the second pressurized tank 70 .

[Fifth embodiment]
Next, a fifth embodiment of the present disclosure will be described based on the drawings. The floating body of the fifth embodiment differs from the above-described third embodiment in the return destination of part of the ammonia used as the coolant in the canned motor pump. Therefore, referring to FIG. 1 of the first embodiment, the same parts as those of the above-described third embodiment are given the same reference numerals, and overlapping descriptions are omitted.

A floating body 401 in the fifth embodiment includes a floating body body 2, an upper structure 4, a combustion device 8, an ammonia tank 10, an ammonia fuel supply system 20, and a fuel supply device chamber 30.

FIG. 8 is a diagram corresponding to FIG. 4 in the fifth embodiment of the present disclosure.
As shown in FIG. 8, the ammonia fuel supply system 20 of the fifth embodiment includes a fuel tank lead-out line 41, a low pressure pump 42, a first heat exchanger 43, a first pressurized tank 44, a supply line 45 , canned motor pump 146, fourth return line 180 (second pressurized tank return line), first return line 47, first pressure regulating valve 48, first pressure sensor 49, first flow sensor 50, second heat exchanger 51, second pressure regulating valve 52, second pressure sensor 53, fuel tank return line 57, supply return line 59, third pressure regulating valve 60, third pressure. A sensor 61, a second pressurized tank 70, a second inert gas supply section 71, a second gas release section 72, a second liquid level adjustment section 73, a bypass line 74, and a first switching valve 75. , a second switching valve 76 , a fourth pressure sensor 162 and a fourth pressure regulating valve 158 .

The canned motor pump 146 of the fifth embodiment returns the ammonia used as the coolant for the motor part only to the vapor phase of the second pressurization tank 70 through the fourth return line 180 . In other words, the ammonia used as the coolant for the motor portion of the canned motor pump 146 is not returned to the first pressurization tank 44 .

Also, the first pressurized tank 44 of the fifth embodiment is managed so as not to form a gas phase inside. In other words, the first pressurized tank 44 is filled with liquefied ammonia. Therefore, in the first pressurized tank 44 of the fifth embodiment, the first inert gas supply unit 55 and the first gas discharge unit 56 provided for the purpose of maintaining the pressure of the gas phase in each of the above-described embodiments not connected. For the purpose of purging the inside of the first pressurization tank 44, a configuration for supplying an inert gas and a configuration for discharging the gas inside the first pressurization tank 44 may be provided.

In addition, since the first pressurization tank 44 of the fifth embodiment is managed so as not to form a gas phase, instead of the first liquid level detector 62 of the first embodiment, the first pressurization tank 44 A fourth pressure sensor 162 is provided to detect the internal fluid pressure. Furthermore, a fourth pressure regulating valve 158 is provided in place of the flow regulating valve 58 of the first embodiment. The fourth pressure regulating valve 158 adjusts the valve opening degree based on the detection result of the fourth pressure sensor 162 . The fourth pressure regulating valve 158 regulates the pressure inside the first pressurized tank 44 so that it does not exceed a predetermined upper limit pressure. Also in the fifth embodiment, the sixth heat exchanger 93 may be provided in the fourth return line 180 as in the fourth embodiment.

(Effect)
According to the fifth embodiment, it is not necessary to form a gas phase in the first pressurization tank 44, so there is no need to adjust the liquid level. Since the pressure of the first pressurization tank 44 can be adjusted by the low-pressure pump 42, the number of parts can be reduced and the configuration can be simplified.

(Modification of fifth embodiment)
FIG. 9 is a diagram corresponding to FIG. 5 in a modification of the fifth embodiment of the present disclosure.
In the fifth embodiment described above, the case where one canned motor pump 146 is provided as the boosting pump has been described as an example. However, the number of boost pumps for boosting the ammonia flowing through the supply line 45 is not limited to one.

For example, like the floating body of the modification of the fifth embodiment shown in FIG. 9, it may have a plurality of canned motor pumps provided in series in the supply line 45. In this modified example of the fifth embodiment, as in the modified example of the third embodiment and the modified example of the fourth embodiment described above, two canned motor pumps are a first canned motor pump 246A and a second canned motor pump 246B. and

In the modified example of the fifth embodiment, the ammonia used as the coolant for the motor portion of the first canned motor pump 246A is transferred from the first canned motor pump 246A to the second pressure tank 70 through the fourth return line 180. reverting to phase. Similarly, the ammonia used as the coolant for the motor portion of the second canned motor pump 246B is transferred from the second canned motor pump 246B to the second pressurized tank 70 through the fifth return line 380 (second pressurized tank return line). returned to the gas phase. In other words, none of the ammonia used as the coolant for the motor parts of the first canned motor pump 246A and the second canned motor pump 246B is returned to the first pressurization tank 44 . A sixth heat exchanger 93 is provided in the fourth return line 180, and a seventh heat exchanger 96 is provided in the fifth return line 380, so that the fourth return line 180 and the fifth return line 380 are provided with The flowing ammonia may be cooled.

(Effect)
According to the modified example of the fifth embodiment, even if the ammonia pressure required by the combustion device 8 differs, for example, depending on the manufacturer, by adding or removing the boost pump, the ammonia pressure required by the combustion device 8 can be increased. pressure can be increased. Furthermore, since a plurality of booster pumps are provided in series, the canned motor pump is less expensive than a single pump that boosts the ammonia flowing through the supply line 45 to a pressure higher than that required by the combustion device 8. can be used to reduce costs. Moreover, since it is no longer necessary to form a gas phase in the first pressurization tank 44, it is no longer necessary to adjust the liquid level. Since the pressure of the first pressurization tank 44 can be adjusted by the low-pressure pump 42, the number of parts can be reduced and the configuration can be simplified.

(Other embodiments)
The present disclosure is not limited to the configuration of each embodiment described above, and design changes are possible without departing from the scope of the present disclosure.
For example, in the above-described embodiment, the case where the floating body 1 is a ship that can be navigated by a main engine or the like has been described, but the floating body is not limited to a ship as long as it can store ammonia.

In the first embodiment, the case where the second pressure regulating valve 52 is provided in the first return line 47 between the second heat exchanger 51 and the first pressurized tank 44 has been described. However, without providing the second pressure regulating valve 52, the pressure in the first pressurized tank 44 can be kept lower than the pressure of the ammonia in the combustion device 8 by the low-pressure pump 42, and the ammonia can be maintained in a liquid state. pressure. In this case, the first inert gas supply section 55 and the low-pressure pump 42 constitute the pressure holding section in the present disclosure. When the second pressure regulating valve 52 is provided as in the first embodiment, the piping of the first return line 47 from the second pressure regulating valve 52 to the first pressurized tank 44, the first pressurized tank 44 This is advantageous in terms of cost reduction compared to the case where the second pressure regulating valve 52 is not provided because the pressure resistance performance of the second pressure regulating valve 52 can be lowered.

<Appendix>
The floating bodies described in the embodiments are understood, for example, as follows.

(1) According to the first aspect, the floating body includes a floating body main body, a fuel tank provided in the floating body main body and storing ammonia, and a first fuel tank in which the ammonia from the fuel tank is stored in a pressurized state. A pressurized tank 44, a supply line 45 through which the ammonia is led out from the first pressurized tank 44, a boost pump 46 that pressurizes the ammonia flowing through the supply line 45, and the ammonia is supplied as fuel, a first return line 47 that returns the ammonia that has passed through the engine 8 to the first pressurized tank 44, and the first return line 47 is provided in the engine 8 A first pressure regulating valve 48 capable of regulating the pressure of the ammonia, a cooling section provided downstream of the first pressure regulating valve 48 in the first return line 47 to cool the ammonia, and the first return The pressure of the ammonia between the first pressure regulating valve 48 in line 47 and the cooling section is lower than the pressure of the ammonia in the engine 8, and a pressure that can maintain the ammonia in a liquid state. and a pressure holding part that holds the pressure.
Examples of the floating body 1 include ships such as liquefied gas carriers, ferries, RORO ships, car carriers, and passenger ships, FSUs (Floating Storage Units), FSRUs (Floating Storage and Regasification Units), and the like.

As a result, ammonia can be prevented from vaporizing between the first pressure regulating valve 48 and the cooling section while arranging the cooling section downstream of the first pressure regulating valve 48 having a low pressure. Therefore, troubles caused by erosion in the piping can be suppressed. In addition, since a cooling unit with low pressure resistance can be used, cost reduction can be achieved.

(2) According to the second aspect, the floating body is the floating body of (1), and the pressure holding section is located between the cooling section of the first return line 47 and the first pressurized tank 44. A second pressure regulating valve 52 is provided.
As a result, the pressure of ammonia between the first pressure regulating valve 48 of the first return line 47 and the cooling section can be easily maintained at a pressure at which ammonia can be maintained in a liquid state.

(3) According to the third aspect, the floating body is the floating body of (1) or (2), and includes a plurality of booster pumps 46 provided in series in the supply line 45 .
As a result, even if the ammonia pressure required by the engine 8 differs, for example, depending on the manufacturer, the ammonia pressure required by the engine 8 can be boosted by adding the boost pump 46 in series. . Furthermore, compared to the case where a single booster pump is used to boost the pressure to the level higher than the pressure required by the engine 8, it is possible to use an inexpensive booster pump, so that costs can be reduced.

(4) According to the fourth aspect, the floating body is any one of (1) to (3), and the boost pump is provided in the supply line 45 and the first pressurization tank 44 and a canned motor pump 146 that uses part of the ammonia flowing through the supply line 45 as a cooling liquid for the motor unit, wherein the inert gas is added to the first pressurized tank 44 and a second return line 80 for returning the ammonia used as coolant in the canned motor pump 146 to the gas phase of the first pressurized tank 44 .
As a result, a gas phase can be formed in the first pressurization tank 44, so that it is possible to prevent air bubbles from entering the liquid phase of ammonia. In addition, by supplying the inert gas into the first pressurization tank 44, it is possible to prevent the pressure in the first pressurization tank 44 from decreasing and evaporating liquid ammonia. In addition, it is not necessary to return the ammonia used as the coolant to a tank such as a fuel tank installed at a location away from the canned motor pump 146 and having a gas phase. Therefore, even if the ammonia used as the coolant for the canned motor pump 146 is contaminated with oil or the like, the ammonia outside the fuel supply system of the engine 8 can be prevented from being contaminated.

(5) According to the fifth aspect, the floating body is the floating body of (4), in which the first liquid level detection unit 62 for detecting the liquid level in the first pressurization tank 44 and the first pressurization and a first liquid level adjustment valve for adjusting the flow rate of the ammonia supplied into the tank 44 .
As a result, even if the flow rate of ammonia discharged from the first pressurization tank 44 fluctuates according to the load fluctuation of the engine 8, etc., the liquid level in the first pressurization tank 44 can be easily kept within a predetermined liquid level range. can be maintained.

(6) According to the sixth aspect, the floating body is any one of (1) to (5), and the first return line between the cooling section and the first pressure tank 44 47, a second pressurized tank 70 capable of storing the ammonia flowing through the first return line 47, and a second inert gas supply unit 71 for supplying inert gas into the second pressurized tank 70 And prepare.
As a result, when purging the ammonia in the fuel system for maintenance or fuel switching, the liquid ammonia can be recovered by the second pressurization tank 70 . Also, the amount of purge gas flowing into the first pressurization tank 44 can be reduced. Therefore, the capacity of the first pressurization tank 44 can be reduced. Therefore, the degree of freedom of arrangement of the first pressurization tank 44 can be improved.

(7) According to the seventh aspect, the floating body is the floating body of (6), in which the second liquid level detection unit 77 for detecting the liquid level in the second pressurization tank 70 and the second pressurization and a second liquid level control valve for adjusting the flow rate of the ammonia discharged from the tank 70 through the first return line 47 .
As a result, even if the flow rate of the liquid ammonia flowing into the second pressurization tank 70 or the flow rate of the liquid ammonia discharged from the second pressurization tank 70 fluctuates according to the load fluctuation of the engine 8, the The liquid level in the second pressurization tank 70 can be easily maintained within a predetermined liquid level range.

(8) According to the eighth aspect, the floating body is the floating body of (1) or (2), and the boost pump 146 is provided in the supply line 45 and discharged from the first pressurization tank 44. A canned motor pump 146 that increases the pressure of the ammonia flowing through the supply line 45 and uses a part of the ammonia flowing through the supply line 45 as a cooling liquid for the motor unit, and is between the cooling unit and the first pressurization tank 44 A second pressurized tank 70 provided in the first return line 47 and capable of storing the ammonia flowing through the first return line 47; An active gas supply unit 71 and a second pressurized tank return line 180 for returning part of the ammonia used as coolant in the canned motor pump 146 to the gas phase of the second pressurized tank 70 are further provided.
As a result, part of the ammonia used as coolant in the canned motor pump 146 can be returned to the gas phase in the second pressurization tank 70 .

(9) According to the ninth aspect, the floating body is the floating body of (8), and part of the ammonia used as the coolant in the canned motor pump 146 is returned to the second pressurized tank return line 180 It is possible to return only to the gas phase of the second pressurization tank 70, and the pressure detection part 162 that detects the pressure in the first pressurization tank 44 and the pressure in the first pressurization tank 44 are adjusted. A pressure adjustment unit 42 , 158 is further provided.
This eliminates the need to form a gas phase in the first pressurization tank 44, thereby eliminating the need to adjust the liquid level. Moreover, since the pressure of the first pressurization tank 44 can be adjusted by the pressure adjustment units 42 and 158, the number of parts can be reduced and the configuration can be simplified.

(10) According to the tenth aspect, the floating body is the floating body of (8), and the second Switching units 91 and 92 for circulating part of the ammonia used as cooling liquid in the canned motor pump 146 to the return line 80 and at least one of the second return line 80 and the second pressurized tank return line 180. And further comprising.
This makes it possible to return part of the ammonia used as coolant in the canned motor pump 146 to at least one of the first pressurization tank 44 and the second pressurization tank 70 in which the vapor phase is formed.

This disclosure suppresses the occurrence of problems such as thinning due to erosion by handling ammonia in the pipe in a liquid phase instead of a gas-liquid mixture, and also reduces costs by using a cooling unit with low pressure resistance. can be planned.

1, 101, 201... Floating body 2... Floating body main body 4... Superstructure 5A, 5B... Broadside 6... Ship bottom 7... Upper deck 8... Combustion device (engine) 10... Ammonia tank 20... Ammonia fuel supply system 30... Fuel supply device room 41... Fuel tank outlet line 42... Low pressure pump 43... First heat exchanger 44... First pressure tank 45... Supply line 46... Booster pump 47... First return line 47A... Upstream line 47B... Downstream line 48... First pressure regulating valve 49... First pressure sensor 50... First flow rate sensor 51... Second heat exchanger (cooling section) 52... Second pressure regulating valve (pressure holding section) 53... Second pressure sensor 54... First Liquid level adjustment part 55... First inert gas supply part 56... First gas release part 57... Fuel tank return line 58... Flow control valve 59... Supply return line 60... Third pressure control valve 61... Third pressure sensor 62 ... first liquid level detector 63... first liquid level adjustment valve 70... second pressure tank 71... second inert gas supply section 72... second gas release section 73... second liquid level adjustment section 74... bypass line 75... First switching valve 76... Second switching valve 77... Second liquid level detector 78... Second liquid level adjusting valve 80... Second return line 81... Third heat exchanger 85... Fifth heat exchanger 91... Third switching valve (switching part) 92... Fourth switching valve (switching part) 93... Sixth heat exchanger 94... Fifth switching valve 95... Sixth switching valve 96... Seventh heat exchanger 146... Canned motor pump 158 ... Fourth pressure regulating valve (pressure adjusting section) 162 ... Fourth pressure sensor (pressure detecting section) 180 ... Fourth return line (second pressurized tank return line) 246A ... First canned motor pump 246B ... Second canned motor Pump 280... 3rd return line 281... 4th heat exchanger 380... 5th return line (second pressure tank return line)

Claims (10)

1. a floating body body;
   a fuel tank provided in the floating body main body and storing ammonia;
   a first pressurized tank in which the ammonia from the fuel tank is stored in a pressurized state;
   a supply line through which the ammonia is led out from the first pressurized tank;
   a booster pump that boosts the ammonia flowing through the supply line;
   an engine to which the ammonia is supplied as fuel through the supply line;
   a first return line returning the ammonia that has passed through the engine to the first pressurized tank;
   a first pressure regulating valve provided in the first return line and capable of regulating the pressure of the ammonia in the engine;
   a cooling unit provided downstream of the first pressure regulating valve in the first return line to cool the ammonia;
   The pressure of the ammonia between the first pressure regulating valve in the first return line and the cooling section is lower than the pressure of the ammonia in the engine and capable of maintaining the ammonia in a liquid state. a pressure retainer that retains the pressure;
   float.
2. The floating body according to claim 1, wherein the pressure holding section includes a second pressure regulating valve provided between the cooling section of the first return line and the first pressurization tank.
3. The floating body according to claim 1 or 2, comprising a plurality of said booster pumps provided in series with said supply line.
4. The boost pump is
   A canned motor pump that is provided in the supply line and uses a part of the ammonia flowing through the supply line as a cooling liquid for a motor unit, while increasing the pressure of the ammonia that is led out from the first pressurization tank,
   a first inert gas supply unit that supplies inert gas into the first pressurized tank;
   a second return line returning a portion of the ammonia used as coolant in the canned motor pump to the gas phase of the first pressurized tank;
   The floating body according to claim 1 or 2.
5. a first liquid level detector that detects the liquid level in the first pressurized tank;
   a first liquid level adjustment valve that adjusts the flow rate of the ammonia supplied into the first pressurized tank;
   The floating body according to claim 4, comprising:
6. a second pressurized tank provided in the first return line between the cooling unit and the first pressurized tank and capable of storing the ammonia flowing through the first return line;
   The floating body according to claim 1 or 2, further comprising a second inert gas supply unit that supplies inert gas into the second pressurized tank.
7. a second liquid level detector that detects the liquid level in the second pressurized tank;
   a second liquid level control valve that adjusts the flow rate of the ammonia discharged from the second pressurized tank through the first return line;
   The floating body according to claim 6, comprising:
8. The boost pump is
   A canned motor pump that is provided in the supply line and uses a part of the ammonia flowing through the supply line as a cooling liquid for a motor unit, while increasing the pressure of the ammonia that is led out from the first pressurization tank,
   a second pressurized tank provided in the first return line between the cooling unit and the first pressurized tank and capable of storing the ammonia flowing through the first return line;
   a second inert gas supply unit that supplies inert gas into the second pressurized tank;
   a second pressurized tank return line returning part of the ammonia used as coolant in the canned motor pump to the gas phase of the second pressurized tank;
   The floating body according to claim 1 or 2, further comprising:
9. A part of the ammonia used as a coolant in the canned motor pump can be returned only to the gas phase of the second pressurized tank through the second pressurized tank return line,
   a pressure detection unit that detects the pressure in the first pressurized tank;
   a pressure adjustment unit that adjusts the pressure in the first pressurized tank;
   The floating body according to claim 8, further comprising:
10. a second return line returning a portion of the ammonia used as coolant in the canned motor pump to the first pressurized tank;
    9. The switching unit according to claim 8, further comprising a switching unit that circulates a part of the ammonia used as a coolant in the canned motor pump to at least one of the second return line and the second pressurized tank return line. floating body.

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