Ammonia storage facility, ammonia transporting system, power generating system, and pump unit

Abstract

To reduce a space required for construction of an ammonia storage facility.SOLUTION: An ammonia transporting system comprises: an ammonia tank (11) for storing liquid ammonia inside, provided with a dike (13) for damming the liquid ammonia leaking from the ammonia tank (11); and a pump unit (14) for supplying the liquid ammonia stored in the ammonia tank (11) to a vaporizer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an ammonia storage facility, an ammonia transport system, a power generation system, and a pump unit. [Background technology]

[0002] In order to reduce greenhouse gas emissions, power generation systems using ammonia as fuel have been developed. This is because ammonia can be burned without emitting carbon dioxide. In such power generation systems, an ammonia storage facility for storing liquid ammonia is required. Patent Document 1, for example, is an example of a document disclosing an ammonia storage facility. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2015-147606 Summary of the Invention [Problem to be solved by the invention]

[0004] When an ammonia tank is installed, the site on which it is installed is usually surrounded by a liquid containment dike. This is to prevent liquid ammonia from leaking outside the area surrounded by the dike if the ammonia tank is damaged or otherwise leaks out. The construction of such a dike is also required by law (for example, Article 22 of the Regulations on the Control of Hazardous Materials).

[0005] However, when a structure in which the site on which the ammonia tank is installed is surrounded by a dike is adopted, a problem occurs in that a large space is required for the construction of the ammonia storage facility, which in turn requires a large space for the construction of the power generation system.

[0006] One aspect of the present invention has been made in consideration of the above problems, and an object of the present invention is to provide an ammonia transportation system or an ammonia storage facility that requires a small space for construction. [Means for solving the problem]

[0007] An ammonia transport system according to one embodiment of the present invention includes an ammonia tank that stores liquid ammonia therein, the ammonia tank having a liquid retaining dike that blocks liquid ammonia leaking from the ammonia tank, and a pump unit that supplies the liquid ammonia stored in the ammonia tank to a vaporizer.

[0008] An ammonia storage facility according to one embodiment of the present invention includes an ammonia tank that stores liquid ammonia therein, and a liquid retaining dike that is provided in a part of the ammonia tank and that blocks liquid ammonia leaking from the ammonia tank. Effect of the Invention

[0009] According to one aspect of the present invention, since the liquid retaining dike is provided in a part of the ammonia tank, the space required for constructing the ammonia storage facility can be reduced. [Brief description of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing a configuration of an ammonia storage facility according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a first modified example of the ammonia storage facility shown in FIG. [Diagram 3] 1. FIG. 4 is a cross-sectional view showing a second modified example of the ammonia storage facility shown in FIG. [Figure 4] 1. FIG. 4 is a cross-sectional view showing a third modified example of the ammonia storage facility shown in FIG. [Diagram 5] FIG. 2 is a block diagram of a power generation system including the ammonia storage facility shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Configuration of ammonia storage facility) The configuration of an ammonia storage facility 1 according to one embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view of the ammonia storage facility 1.

[0012] The ammonia storage facility 1 is an apparatus for storing liquid ammonia. The ammonia storage facility 1 includes an ammonia tank 11, a foundation 12, and a liquid retaining dike 13.

[0013] The ammonia tank 11 is a tank for storing liquid ammonia therein. The ammonia tank 11 is composed of a bottom wall 11a, a cylindrical side wall 11b rising from the periphery of the bottom wall 11a, and a dome-shaped ceiling wall 11c closing an opening of the side wall 11b on the side opposite to the bottom wall 11a. In this embodiment, the ammonia tank 11 is a metal double tank in which the bottom wall 11a, the side wall 11b, and the ceiling wall 11c are respectively composed of an inner shell 111, an outer shell 112, and a cooling agent 113. Here, the cooling agent 113 is filled in the space between the inner shell 111 and the outer shell 112, and is used to keep the temperature inside the tank below the boiling point of ammonia.

[0014] The ammonia tank 11 is installed on a foundation 12 laid or buried in the ground. The liquid retaining dike 13 is a cylindrical wall provided on the side wall 11b of the ammonia tank 11 and rising from the periphery of the foundation 12. Here, the liquid retaining dike 13 may be in contact with the side wall 11b of the ammonia tank 11, or may be adjacent to it without contacting it. In this embodiment, the foundation 12 and the liquid retaining dike 13 are formed of precast concrete panels.

[0015] As described above, in the ammonia storage facility 1, the liquid retaining dike 13 is provided on the side wall 11b of the ammonia tank 11. Therefore, liquid ammonia leaking from the ammonia tank 11 can be blocked by the liquid retaining dike 13. Also, the liquid retaining dike 13 is provided on a part of the ammonia tank 11 (side wall 11b in this embodiment). Therefore, there is no need to surround a vast area including the ammonia tank 11 with a liquid retaining dike in order to prevent the outflow of liquid ammonia.

[0016] When the liquid barrier 13 is in contact with the side wall 11b of the ammonia tank 11, for example, liquid ammonia attempting to leak from a welded seam of the side wall 11b is blocked by the liquid barrier 13. On the other hand, when the liquid barrier 13 is in close proximity to but not in contact with the side wall 11b of the ammonia tank 11, for example, liquid ammonia leaking from a welded seam of the side wall 11b is blocked by the liquid barrier 13 (and stored in the gap between the side wall 11b and the liquid barrier 13). In this case, a liquid supply mechanism may be provided for supplying a liquid (for example, water) for diluting and detoxifying the liquid ammonia stored between the side wall 11b and the liquid barrier 13.

[0017] In the ammonia storage facility 1, the ammonia tank 11 is installed on a foundation 12, and the liquid retaining dike 13 rises from the peripheral portion of the foundation 12. Therefore, it is possible to prevent the liquid ammonia blocked by the liquid retaining dike 13 from infiltrating into the ground.

[0018] Furthermore, in the ammonia storage facility 1, the foundation 12 and the flood barrier 13 are made of precast concrete. Therefore, the construction period of the ammonia storage facility 1 can be shortened, and the construction cost of the ammonia storage facility 1 can be kept low.

[0019] It is preferable that the height of the dike 13 is (1) 0.5 m or more, and (2) set so that the volume of the space enclosed by the foundation 12 and the dike 13 is 110% or more of the volume of the ammonia tank 11. This makes it possible to realize an ammonia storage facility 1 that satisfies the requirements of Article 22, Paragraph 2, Items 1 and 2 of the Regulations on the Control of Hazardous Materials, without having to install a separate dike that surrounds a wide area including the ammonia tank 11. (First modified example of ammonia storage facility) A first modified example of the ammonia storage facility 1 (hereinafter also referred to as ammonia storage facility 1A) will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view of the ammonia storage facility 1A. Note that in Fig. 2, the cross-sectional structure of the pump unit 14 is omitted. Note that a system including the ammonia tank 11 and the pump unit 14 has a function of transporting liquid ammonia in addition to a function of storing liquid ammonia. This system can also be called a liquid ammonia transport system.

[0020] The ammonia storage facility 1A is obtained by adding a pump unit 14 for supplying liquid ammonia stored inside an ammonia tank 11 to a vaporizer, which will be described later, to the ammonia storage facility 1 shown in FIG.

[0021] In the ammonia storage facility 1A, a through hole 11d is formed in the center of the ceiling wall 11c of the ammonia tank 11. The pump unit 14 has (1) a pump body 14a including an impeller, a shaft, etc. for transporting liquid ammonia, (2) an electric component 14b including a motor, etc. for rotating the impeller, the shaft, etc., (3) a bearing portion 14c interposed between the pump body 14a and the electric component 14b and rotatably supporting the rotor (impeller, shaft, etc.), and (4) a flange portion 14d for fixing the pump unit 14 to the ammonia tank 11. The flange portion 14d is a part of the pump body 14a. The pump unit 14 is inserted into the through hole 11d so that the tip suction port of the pump body 14a faces the bottom wall 11a of the ammonia tank 11 in close proximity, and is attached to the ceiling wall 11c so that the flange portion 14d closes the through hole 11d. At this time, pump body 14a is immersed in the liquid ammonia stored inside ammonia tank 11. This makes it possible to pump up the liquid ammonia stored inside ammonia tank 11 using pump unit 14 and supply it to a vaporizer, etc., which will be described later.

[0022] Here, flange portion 14d, which is a part of pump body 14a, is used as a fixing means for fixing pump unit 14 to ammonia tank 11, but the present invention is not limited to this. A part of ammonia tank 11 may be used as a fixing means for fixing pump unit 14 to ammonia tank 11. Also, an independent part that is neither a part of pump unit 14 nor a part of ammonia tank 11 may be used as a fixing means for fixing pump unit 14 to ammonia tank 11.

[0023] In addition, the electric components 14b of the pump unit 14 are disposed outside the ammonia tank 11. Here, examples of the electric components 14b of the pump unit 14 include a motor, a drive circuit for driving the motor, and a power supply circuit for supplying power to the drive circuit. As a result, the electric components 14b of the pump unit 14 are not exposed to liquid ammonia or gaseous ammonia, so that failure and deterioration of the pump unit 14 can be suppressed. In addition, the electric components 14b of the pump unit 14 can be maintained without additional work such as pulling out the entire pump unit 14 from the ammonia tank 11. It is preferable that the bearing portion 14c that receives the axial thrust of the pump unit 14 is also disposed outside the ammonia tank 11. In this case, the maintenance of the bearing portion 14c can be performed without additional work such as pulling out the entire pump unit 14 from the ammonia tank 11, similar to the maintenance of the electric components 14b.

[0024] (Second modified example of ammonia storage facility) A second modified example of the ammonia storage equipment 1 (hereinafter, also referred to as ammonia storage equipment 1B) will be described with reference to Fig. 3. Fig. 3 is a cross-sectional view of the ammonia storage equipment 1B. Note that in Fig. 3, the cross-sectional structure of the pump unit 14 is omitted.

[0025] The ammonia storage facility 1B is obtained by adding a liquid retaining dike 15 for blocking liquid ammonia leaking from the ammonia tank 11 via the pump unit 14 to the ammonia storage facility 1A shown in FIG.

[0026] In the ammonia storage facility 1B, the liquid retaining dike 15 is provided on the ceiling wall 11c of the ammonia tank 11 so as to take in the pump unit 14. Therefore, the liquid retaining dike 15 can block liquid ammonia leaking from the ammonia tank 11 through the pump unit 14 or through a gap between the pump unit 14 and the ceiling wall 11c.

[0027] In addition, when the possibility of liquid ammonia leaking from ammonia tank 11 without passing through pump unit 14 can be ignored, liquid retaining dike 13 may be omitted from ammonia storage facility 1B.

[0028] (Third variant of ammonia storage facility) A third modified example of the ammonia storage equipment 1 (hereinafter, also referred to as ammonia storage equipment 1C) will be described with reference to Fig. 4. Fig. 3 is a cross-sectional view of the ammonia storage equipment 1C. Note that in Fig. 4, the cross-sectional structure of the pump unit 14 is omitted.

[0029] In the ammonia storage equipment 1A shown in FIG. 2, the pump unit 14 is attached to the ceiling wall 11c of the ammonia tank 11, whereas in the ammonia storage equipment 1C shown in FIG. 4, the pump unit 14 is attached to the side wall 11b of the ammonia tank 11.

[0030] In the ammonia storage facility 1C, a through hole 11e is formed in the lower end of the side wall 11b of the ammonia tank 11. As described above, the pump unit 14 has (1) a pump body 14a including an impeller, a shaft, etc., (2) an electric component 14b including a motor for rotating the impeller, the shaft, etc., (3) a bearing portion 14c interposed between the pump body 14a and the electric component 14b and rotatably supporting the rotor (impeller, shaft, etc.), (4) a flange portion 14d interposed between the pump body 14a and the suction pipe 14e for fixing the pump unit 14 to the ammonia tank 11, and (5) a suction pipe 14e for sucking liquid ammonia. The pump unit 14 is inserted into the through hole 11e so that the tip side of the suction pipe 14e faces the bottom wall 11a of the ammonia tank 11 in close proximity, and is attached to the side wall 11b so that the flange portion 14d closes the through hole 11e. In the illustrated example, the two flange portions 14d are disposed between the inner shell 111 and the outer shell 112 of the side wall 11b, one flange portion 14d is fixed to the inner shell 111, and the other flange portion 14d is fixed to the outer shell 112. At this time, the suction pipe 14e is immersed in the liquid ammonia stored inside the ammonia tank 11. This makes it possible to pump up the liquid ammonia stored inside the ammonia tank 11 using the pump unit 14 and supply it to a vaporizer or the like, which will be described later.

[0031] Here, flange portion 14d, which is a component of pump unit 14, is used as a fixing means for fixing pump unit 14 to ammonia tank 11, but the present invention is not limited to this. A component of ammonia tank 11 may be used as a fixing means for fixing pump unit 14 to ammonia tank 11. Also, an independent component that is neither a component of pump unit 14 nor a component of ammonia tank 11 may be used as a fixing means for fixing pump unit 14 to ammonia tank 11.

[0032] Moreover, the pump body 14a, the electric components 14b, and the bearing section 14c of the pump unit 14 are disposed inside a storage chamber provided in the liquid barrier 13. This storage chamber is sealed by the lid section 13a from the outside of the liquid barrier 13. This prevents the pump body 14a, the electric components 14b, and the bearing section 14c of the pump unit 14 from being exposed to liquid ammonia or gaseous ammonia, thereby suppressing failure and deterioration of the pump unit 14. Furthermore, the pump body 14a, the electric components 14b, and the bearing section 14c of the pump unit 14 can be maintained without additional work such as pulling out the entire pump unit 14 from the ammonia tank 11.

[0033] (Power generation system configuration) The configuration of a power generation system 10 according to one embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a block diagram showing the configuration of the power generation system 10.

[0034] The power generation system 10 includes a vaporizer 2, a boiler 3, a turbine 4, and a generator 5, in addition to the ammonia storage facility 1 described above.

[0035] The vaporizer 2 is configured to generate gaseous ammonia by vaporizing the liquid ammonia supplied from the ammonia storage facility 1. The gaseous ammonia generated by the vaporizer 2 is supplied to the boiler 3. Note that a seal member may be provided at a joint of a pipe connecting the ammonia storage facility 1 and the vaporizer 2 to prevent leakage of the liquid ammonia.

[0036] The boiler 3 is configured to generate steam by burning the gaseous ammonia supplied from the vaporizer 2. The steam generated by the boiler 3 is supplied to the turbine 4. The boiler 3 may be one that uses gaseous ammonia as a main fuel, or may be one that uses pulverized coal, heavy oil, or the like as a main fuel and uses gaseous ammonia as a secondary fuel.

[0037] The turbine 4 is a component for converting energy of the steam supplied from the boiler 3 into rotational energy of a rotor. The rotor rotated by the turbine 4 is mechanically connected to a generator 5.

[0038] The generator 5 is configured to convert the rotational energy of the rotor rotated by the turbine 4 into electrical energy. The electrical energy generated by the generator 5 is output to the outside of the power generation system 10.

[0039] As described above, the power generation system 10 can convert the chemical energy of liquid ammonia into electrical energy. Moreover, since the space required for installing the ammonia storage facility 1 is smaller than in the past, the power generation system 10 can be constructed on a smaller plot of land than in the past.

[0040] Although the power generation system 10 including the ammonia storage facility 1 shown in Fig. 1 has been described here, the present invention is not limited thereto. For example, the power generation system 10 including the ammonia storage facility 1A shown in Fig. 2 instead of the ammonia storage facility 1 shown in Fig. 1, and the power generation system 10 including the ammonia storage facility 1B shown in Fig. 3 instead of the ammonia storage facility 1 shown in Fig. 1 are also included in the scope of the present invention.

[0041] Furthermore, the power generation system 10 may include a separation and recovery mechanism for separating and recovering the liquid ammonia remaining unvaporized in the vaporizer 2 and / or the gaseous ammonia remaining uncombusted in the boiler 3, and returning them to the ammonia tank 11 or supplying them again to the vaporizer 2. This makes it possible to convert the liquid ammonia into electrical energy more efficiently.

[0042] (Summary 1) The ammonia storage facility according to aspect 1 is an ammonia storage facility for storing liquid ammonia, and includes an ammonia tank that stores liquid ammonia therein, and a liquid retaining dike that is provided in a part of the ammonia tank and that blocks liquid ammonia leaking from the ammonia tank.

[0043] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided in a part of the ammonia tank, the space required for constructing the ammonia storage facility can be reduced.

[0044] An ammonia storage facility according to a second aspect is the ammonia storage facility according to the first aspect, wherein the liquid retaining dike is provided on a side wall that is a part of the ammonia tank.

[0045] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank through the side wall (e.g., the welded joint) of the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided on the side wall of the ammonia tank, the space required for constructing the ammonia storage facility can be reduced.

[0046] The ammonia storage facility according to a third aspect is the ammonia storage facility according to the second aspect, further comprising a foundation laid or buried in the ground, and the liquid retaining wall rises from the periphery of the foundation.

[0047] According to the above configuration, it is possible to prevent or suppress liquid ammonia leaking from the ammonia tank from entering the ground.

[0048] The ammonia storage facility according to a fourth aspect is the ammonia storage facility according to any one of the first to third aspects, further comprising a pump unit provided in the ceiling wall to close the through hole and for supplying liquid ammonia from the ammonia tank to a vaporizer.

[0049] According to the above configuration, the liquid ammonia stored in the ammonia tank can be effectively supplied to the vaporizer.

[0050] An ammonia storage facility according to a fifth aspect is the ammonia storage facility according to the fourth aspect, wherein an electrical component of the pump unit is disposed outside the ammonia tank.

[0051] According to the above configuration, it is possible to suppress breakdowns and deterioration of the electric components of the pump unit. Also, maintenance of the electric components of the pump unit can be performed without removing the pump unit from the ammonia tank.

[0052] The ammonia storage facility of aspect 6 is the ammonia storage facility of aspect 4 or 5, wherein the liquid retaining dike is provided in the ceiling wall that is part of the ammonia tank and blocks liquid ammonia leaking from the ammonia tank via the pump unit.

[0053] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank through the pump unit or a gap between the pump unit and the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided on the ceiling wall of the ammonia tank, the space required for constructing the ammonia storage facility can be reduced.

[0054] An ammonia storage facility according to a seventh aspect is the ammonia storage facility according to any one of the first to sixth aspects, wherein the liquid retaining wall is made of a precast concrete panel.

[0055] According to the above configuration, the construction period of the ammonia storage facility can be shortened, and the construction cost of the ammonia storage facility can be kept low.

[0056] A liquid ammonia pump according to an eighth aspect is a liquid ammonia pump including a pump unit, the pump unit being provided to close a through-hole formed in a ceiling wall of an ammonia tank, and supplying liquid ammonia from the ammonia tank to a vaporizer.

[0057] According to the above configuration, the liquid ammonia stored in the ammonia tank can be effectively supplied to the vaporizer.

[0058] A power generation system according to a ninth aspect includes an ammonia storage facility according to any one of the first to seventh aspects, a vaporizer that generates gaseous ammonia by vaporizing liquid ammonia supplied from the ammonia storage facility, a boiler that generates steam by combusting the gaseous ammonia supplied from the vaporizer, a steam turbine that converts energy of the steam supplied from the boiler into rotational energy of a rotor, and a generator that generates electric power using the rotational energy of the rotor.

[0059] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided in a part of the ammonia tank, the space required for constructing the power generation system can be reduced.

[0060] (Summary 2) A liquid ammonia transportation system according to a first aspect includes an ammonia tank that stores liquid ammonia therein and is provided with a liquid retaining dike that blocks liquid ammonia leaking from the ammonia tank, and a pump unit that supplies the liquid ammonia stored in the ammonia tank to a vaporizer.

[0061] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided on the ammonia tank, the space required for constructing the ammonia storage facility can be reduced.

[0062] A liquid ammonia transport system according to a second aspect is the liquid ammonia transport system according to the first aspect, wherein the pump unit has a motor for rotating a rotor, and further includes a fixing means for fixing the pump unit to the ammonia tank so that the motor does not come into contact with the liquid ammonia stored in the ammonia tank.

[0063] According to the above configuration, it is possible to suppress failure or deterioration of the pump unit that may occur due to contact of the motor with liquid ammonia.

[0064] A liquid ammonia transport system according to a third aspect is the liquid ammonia transport system according to the second aspect, wherein the fixing means fixes the pump unit to the ammonia tank such that the motor is disposed outside the ammonia tank.

[0065] According to the above configuration, maintenance of the motor can be performed without removing the pump unit from the ammonia tank.

[0066] A liquid ammonia transport system according to a fourth aspect is the liquid ammonia transport system according to the second or third aspect, wherein the pump unit further has a bearing portion for supporting the rotor, and the fixing means fixes the pump unit to the ammonia tank such that the bearing portion is disposed outside the ammonia tank.

[0067] According to the above configuration, maintenance of the bearing portion can be performed without removing the pump unit from the ammonia tank.

[0068] A liquid ammonia transport system according to a fifth aspect is the liquid ammonia transport system according to any one of the second to fourth aspects, wherein the pump unit penetrates a ceiling wall of the ammonia tank, and the pump unit is fixed to the ammonia tank such that a tip opening of a suction pipe of the pump unit is closely opposed to a bottom wall of the ammonia tank.

[0069] According to the above-mentioned configuration, the pump unit can be easily attached to the ceiling wall of the ammonia tank. Also, since the tip opening of the suction pipe faces closely to the bottom wall of the ammonia tank, the liquid ammonia stored in the ammonia tank can be transported to the vaporizer without waste.

[0070] A liquid ammonia transport system according to a sixth aspect is the liquid ammonia transport system according to any one of the second to fourth aspects, wherein the fixing means fixes the pump unit to the ammonia tank such that the pump unit penetrates a side wall of the ammonia tank and a side surface of the suction pipe of the pump unit faces closely to a bottom wall of the ammonia tank.

[0071] According to the above-mentioned configuration, the pump unit can be easily attached to the side wall of the ammonia tank. Also, since the side surface of the suction pipe faces closely to the bottom wall of the ammonia tank, the liquid ammonia stored in the ammonia tank can be transported to the vaporizer without waste.

[0072] The ammonia storage facility according to a seventh aspect includes an ammonia tank that stores liquid ammonia therein, and a liquid retaining dike that is provided in the ammonia tank and that blocks liquid ammonia leaking from the ammonia tank.

[0073] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided on the ammonia tank, the space required for constructing the ammonia storage facility can be reduced.

[0074] The ammonia storage equipment according to an eighth aspect is the ammonia storage equipment according to the seventh aspect, further comprising a pump unit provided in the ceiling wall so as to cover the through-hole, for supplying liquid ammonia stored in the ammonia tank to a vaporizer.

[0075] According to the above configuration, the pump unit can be easily attached to the ceiling wall of the ammonia tank.

[0076] A power generation system according to a ninth aspect includes the ammonia storage facility according to the seventh or eighth aspect, a vaporizer that generates gaseous ammonia by vaporizing liquid ammonia supplied from the ammonia storage facility, a boiler that generates steam by combusting the gaseous ammonia supplied from the vaporizer, a steam turbine that converts energy of the steam supplied from the boiler into rotational energy of a rotor, and a generator that generates electric power by the rotational energy of the rotor.

[0077] According to the above-mentioned configuration, liquid ammonia leaking from the ammonia tank can be blocked by the liquid retaining dike. Moreover, since the liquid retaining dike is provided in a part of the ammonia tank, the space required for constructing the power generation system can be reduced.

[0078] A pump unit according to a tenth aspect is a pump unit that transports liquid ammonia stored in an ammonia tank, and includes a motor for rotating a rotor, and a fixing means for fixing the pump unit to the ammonia tank so that the motor does not come into contact with the liquid ammonia stored in the ammonia tank.

[0079] According to the above configuration, it is possible to suppress failure or deterioration of the pump unit that may occur due to contact of the motor with liquid ammonia.

[0080] (Additional Notes) The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in the above-described embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0081] 1. Ammonia storage facility 11 Ammonia tank 12 Basics 13 Liquid dike 14 Pump unit 15 Liquid dike 10 Power Generation System 2. Carburetor 3. Boiler 4. Turbine 5. Generator

Claims

1. An ammonia tank for storing liquid ammonia therein, the ammonia tank being provided with a liquid retaining dike for blocking liquid ammonia leaking from the ammonia tank; A pump unit that supplies the liquid ammonia stored in the ammonia tank to a vaporizer. A liquid ammonia transport system comprising:

2. The pump unit has a motor for rotating a rotor, The pump unit may further include a fixing means for fixing the pump unit to the ammonia tank so that the motor does not come into contact with liquid ammonia stored in the ammonia tank.

2. The liquid ammonia transport system of claim 1.

3. The fixing means fixes the pump unit to the ammonia tank such that the motor is disposed outside the ammonia tank.

3. The liquid ammonia transport system of claim 2.

4. The pump unit further includes a bearing portion for supporting the rotor, the fixing means fixes the pump unit to the ammonia tank such that the bearing portion is disposed outside the ammonia tank; 3. The liquid ammonia transport system of claim 2.

5. the fixing means fixes the pump unit to the ammonia tank such that the pump unit penetrates a ceiling wall of the ammonia tank and a tip opening of a suction pipe of the pump unit faces closely to a bottom wall of the ammonia tank.

5. The liquid ammonia transport system according to claim 2, wherein the liquid ammonia transport system comprises:

6. an ammonia tank for storing liquid ammonia therein; a liquid barrier provided in the ammonia tank for blocking liquid ammonia leaking from the ammonia tank; 1. An ammonia storage facility comprising:

7. A through hole is formed in the ceiling wall of the ammonia tank, The ammonia tank further includes a pump unit provided in the ceiling wall so as to close the through hole, for supplying the liquid ammonia stored in the ammonia tank to the vaporizer.

7. The ammonia storage facility according to claim 6.

8. The ammonia storage facility according to claim 6 or 7, A vaporizer that generates gaseous ammonia by vaporizing the liquid ammonia supplied from the ammonia storage facility; A boiler that generates steam by combusting the gaseous ammonia supplied from the vaporizer; a steam turbine that converts the energy of the steam supplied from the boiler into rotational energy of a rotor; A generator that generates electric power by the rotational energy of the rotor. A power generation system comprising:

9. A pump unit for transporting liquid ammonia stored in an ammonia tank, A motor for rotating the rotor; and a fixing means for fixing the pump unit to the ammonia tank so that the motor does not come into contact with liquid ammonia stored in the ammonia tank. A pump unit characterized by:

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