Leaked liquid treatment facility and liquefied gas tank facility

Abstract

To suppress a release amount of evaporated gas to the atmosphere in a case where liquefied gas leaks.SOLUTION: A leaked liquid treatment facility comprises: a dike 4 capable of storing leaked liquefied ammonia X and open upward; a plurality of heat-insulating coated floats 5 that is arranged on a bottom part 4a of the dike 4, and is floated by the liquefied ammonia X stored in the dike 4; and a drainage unit 6 that discharges the liquefied ammonia X stored in the dike 4 to the outside of the dike 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to liquid leakage treatment equipment and liquefied gas tank equipment.

Background Art

[0002] For example, Patent Document 1 discloses a liquefied gas storage tank. The liquefied gas storage tank disclosed in Patent Document 1 is a double-shell tank having an inner shell and an outer shell. A rectangular liquid retaining dike is provided on the outer periphery of such a double-shell tank. In tank equipment provided with such a liquid retaining dike, even when liquefied gas leaks from the double-shell tank, the leakage range of the liquefied gas can be limited to the range surrounded by the liquid retaining dike.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, as liquefied gases, LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) have been widely used. These LNG and LPG have low toxicity of the vaporized gas. Therefore, the liquefied gas that leaks and accumulates inside the liquid retaining dike can be released into the atmosphere. However, in recent years, liquefied ammonia may be used as a fuel. Ammonia gas generated by the vaporization of liquefied ammonia has higher toxicity compared to LNG and LPG, so it is required to suppress the amount of release into the atmosphere even in case of leakage. Also, even in the case of LNG and LPG, it is preferable to suppress the amount of release into the atmosphere when leaked.

[0005] The present invention has been made in view of the above-described problems, and an object thereof is to suppress the amount of vaporized gas released into the atmosphere when liquefied gas leaks.

Means for Solving the Problems

[0006] As means for solving the above problems, the present invention adopts the following configuration.

[0007] A first aspect of the present invention is a liquid leakage treatment facility, which includes a liquid retaining dike capable of storing the leaked liquefied gas and open upward, a plurality of heat-insulating coated floats laid at the bottom of the liquid retaining dike and floated by the liquefied gas stored in the liquid retaining dike, and a liquid discharge section for sending the liquefied gas stored in the liquid retaining dike to the outside of the liquid retaining dike.

[0008] Further, a second aspect of the present invention is a liquefied gas tank facility, which includes a storage tank for storing the liquefied gas, a connection pipe connected to the storage tank for guiding the liquefied gas, and the liquid leakage treatment facility of the first aspect capable of storing the liquefied gas leaked from at least one of the storage tank and the connection pipe.

Advantages of the Invention

[0009] In the present invention, heat-insulating coated floats are laid at the bottom of the liquid retaining dike. Therefore, when liquefied gas is stored in the liquid retaining dike, the heat-insulating coated floats float on the liquid surface of the liquefied gas, and the volatilization of the liquefied gas is suppressed by the heat insulation of the coated floats. Therefore, according to the present invention, it is possible to suppress the amount of vaporized gas released into the atmosphere when liquefied gas leaks.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0011] Hereinafter, with reference to the drawings, an embodiment of a liquid leakage treatment facility and a liquefied gas tank facility according to the present invention will be described.

[0012] (First Embodiment) In this embodiment, an example in which the liquid leakage treatment facility of the present invention is applied to a liquefied ammonia facility that handles liquefied ammonia will be described. However, the liquid leakage treatment facility of the present invention is not limited to application to a liquefied ammonia facility, and can also be applied to a facility that handles liquefied gases different from liquefied ammonia such as LNG and LPG.

[0013] FIG. 1 is a schematic configuration diagram of a liquefied ammonia facility 1 (liquefied gas tank facility) according to this embodiment. Note that FIG. 1 shows a state in which liquefied ammonia X described later has leaked. As shown in FIG. 1, the liquefied ammonia facility 1 of this embodiment includes a storage tank 2, an ammonia delivery section 3, a liquid retaining dike 4, a heat-insulating coating float 5, a drainage section 6, a strainer 7, a drainage vaporization section 8, a rainwater drainage section 9, a return pipe 10, and a transfer pipe 11.

[0014] The storage tank 2 is a tank that stores liquefied ammonia X (liquefied gas). The storage tank 2 is, for example, a metal double-shell tank including a metal inner shell and a metal outer shell. The storage tank 2 includes a heat-insulating material filled between the outer shell and the inner shell, and stores the liquefied ammonia X inside the inner shell in a low-temperature state. Such a storage tank 2 is provided on the bottom 4a of the liquid retaining dike 4 described later.

[0015] The ammonia delivery section 3 sends out liquefied ammonia X from the storage tank 2 to an external supply destination. Note that the ammonia delivery section 3 vaporizes the liquefied ammonia X and sends out the ammonia gas, which is the vaporized gas, toward the supply destination. Such an ammonia delivery section 3 includes a delivery pipe 3a (connection pipe), a delivery pump 3b, and a vaporizer 3c as shown in FIG. 1.

[0016] The delivery pipe 3a is a pipe connected to the storage tank 2, and guides the liquefied ammonia X (or ammonia gas) from the storage tank 2 towards the supply destination. That is, the delivery pipe 3a is a supply pipe that guides the liquefied ammonia X stored in the storage tank 2 towards the supply destination. In FIG. 1, the delivery pipe 3a is connected to the bottom of the storage tank 2. However, the connection position of the delivery pipe 3a to the storage tank 2 is not limited.

[0017] The delivery pump 3b is provided at an intermediate position of the delivery pipe 3a. The delivery pump 3b pumps the liquefied ammonia X from the storage tank 2 side towards the supply destination side. Such a delivery pump 3b is installed, for example, on the bottom 4a of the liquid retaining dike 4. In addition, the delivery pump 3b is protected against liquid by a suction pot or the like in order to quickly discharge the ammonia X from the storage tank 2.

[0018] The vaporizer 3c is at an intermediate position of the delivery pipe 3a and is arranged on the downstream side of the delivery pump 3b. The vaporizer 3c vaporizes the liquefied ammonia X supplied from the storage tank 2 side and discharges it as ammonia gas. A superheater may be provided downstream of the vaporizer 3c.

[0019] The liquid retaining dike 4 prevents the exposed liquefied ammonia X from flowing out to the outside when the liquefied ammonia X leaks from the storage tank 2 or the delivery pipe 3a. That is, the liquid retaining dike 4 can store the leaked liquefied ammonia X.

[0020] As shown in FIG. 1, the liquid retaining dike 4 includes a bottom 4a that supports the storage tank 2 and the like from below, and a surrounding wall 4b that stands on the bottom 4a so as to surround the storage tank 2 when viewed from above, and has a storage space that is open upwards. Such a liquid retaining dike 4 is formed of, for example, concrete.

[0021] At the bottom 4a of the liquid retaining dike 4, a liquid collecting concave portion 4c that is recessed downward is provided. The liquid collecting concave portion 4c is located at the lowest position in the storage space of the liquid retaining dike 4 and is the part where the liquefied ammonia X is most likely to accumulate. Therefore, when the liquefied ammonia X leaks into the liquid retaining dike 4, the liquefied ammonia X accumulates in the liquid collecting concave portion 4c at the earliest stage. Also, when discharging the liquefied ammonia X stored in the liquid retaining dike 4, the liquefied ammonia X accumulates in the liquid collecting concave portion 4c until the latest stage. The position where the liquid collecting concave portion 4c is provided is not particularly limited, but in order to shorten the path until the stored liquefied ammonia X is discharged outside the liquid retaining dike 4, it is preferably provided near the surrounding wall 4b. In addition, in order to improve the gathering of the liquefied ammonia X into the liquid collecting concave portion 4c, an inclined surface that slopes downward toward the liquid collecting concave portion 4c may be provided on a part of the bottom 4a or the like.

[0022] The heat-insulating coated float 5 is a float having heat-insulating properties, and a plurality of them are arranged so as to be spread on the bottom 4a of the liquid retaining dike 4. Each heat-insulating coated float 5 is formed, for example, in a plate shape with the front and back surfaces facing in the vertical direction, and is formed of a material that floats on the liquefied ammonia X. Note that the shape of the heat-insulating coated float 5 is not particularly limited. For example, a block-shaped heat-insulating coated float 5 may be provided.

[0023] Each heat-insulating coated float 5 is connected by a connecting portion (not shown) with a gap from another adjacent heat-insulating coated float 5. That is, a gap is provided between two adjacent heat-insulating coated floats 5, and even when the liquefied ammonia X leaks above the heat-insulating coated floats 5, the liquefied ammonia X flows into the lower part of the heat-insulating coated floats 5 through the gap. Such heat-insulating coated floats 5 are floated by the liquefied ammonia X in a state where the liquefied ammonia X is stored in the liquid retaining dike 4 and are in a state of floating on the liquid surface of the liquefied ammonia X.

[0024] That is, such a heat-insulating coated float 5 is placed on the bottom 4a of the liquid retaining dike 4 when the liquefied ammonia X is not leaking. On the other hand, the heat-insulating coated float 5 floats on the liquid surface of the liquefied ammonia X when the liquefied ammonia X is leaking. In this way, the heat-insulating coated float 5 covers the liquid surface of the leaked liquefied ammonia X and attenuates the heat input from the atmosphere, thereby suppressing the volatilization of the liquefied ammonia X.

[0025] In this embodiment, as will be described later, a strainer 7 is installed above the liquid collecting recess 4c. Therefore, the heat-insulating coated float 5 located above the liquid collecting recess 4c is placed on the strainer 7 when the liquefied ammonia X is not leaking.

[0026] The liquid discharging section 6 discharges the liquefied ammonia X stored in the liquid retaining dike 4 to the outside of the liquid retaining dike 4. As shown in FIG. 1, the liquid discharging section 6 includes a liquid discharging pump 6a and a liquid discharging guide pipe 6b (guide pipe).

[0027] The liquid discharging pump 6a is disposed inside the liquid collecting recess 4c. The liquid discharging pump 6a sucks the liquefied ammonia X while being immersed in the liquefied ammonia X and discharges the liquefied ammonia X to the liquid discharging guide pipe 6b. For example, the liquid discharging pump 6a is driven while being immersed in the liquefied ammonia X under the control of a control device (not shown) and stopped when not immersed in the liquefied ammonia X.

[0028] The liquid discharging guide pipe 6b is a pipe connected to the liquid discharging pump 6a and guides the liquefied ammonia X pumped by the liquid discharging pump 6a to the outside of the liquid retaining dike 4. In this embodiment, the liquid discharging guide pipe 6b is connected to the liquid discharging vaporizing section 8 outside the liquid retaining dike 4 and guides the liquefied ammonia X discharged from the liquid discharging pump 6a to the liquid discharging vaporizing section 8. However, the liquid discharging guide pipe 6b does not necessarily have to be connected to the liquid discharging vaporizing section 8 outside the liquid retaining dike 4 and may be connected to other facilities or the like outside the liquid retaining dike 4.

[0029] The strainer 7 is disposed above the liquid collection recess 4c to prevent foreign matter from entering downward. According to such a strainer 7, the entry of foreign matter into the drainage pump 6a can be prevented. As shown in FIG. 1, in the present embodiment, the strainer 7 is disposed at the uppermost part of the liquid collection recess 4c and is formed to cover the upper end opening of the liquid collection recess 4c. However, the shape of the strainer 7 is not particularly limited, and for example, it may be in a cage shape that covers the liquid suction port of the drainage pump 6a or the entire drainage pump 6a.

[0030] The drainage vaporization unit 8 vaporizes the liquefied ammonia X supplied from the drainage unit 6. The drainage vaporization unit 8 includes a drainage tank 8a and an electric heater 8b (heater). The drainage tank 8a is connected to the drainage pump 6a via a drainage guide pipe 6b. Therefore, the liquefied ammonia X discharged from the drainage tank 8a is guided by the drainage guide pipe 6b and supplied to the drainage tank 8a. Such a drainage tank 8a is a container that temporarily stores the liquefied ammonia X supplied from the drainage unit 6.

[0031] The electric heater 8b is provided inside the drainage tank 8a and generates heat when powered from the outside. Such an electric heater 8b vaporizes the liquefied ammonia X stored inside the drainage tank 8a by heating it to form ammonia gas. Instead of the electric heater 8b, a heater using seawater, steam, or the like may be installed.

[0032] In the present embodiment, such a drainage vaporization unit 8 supplies the ammonia gas generated by vaporizing the liquefied ammonia X to the flare stack F. In the flare stack F, the ammonia gas is combusted. However, the destination to which the drainage vaporization unit 8 supplies the ammonia gas is not limited to the flare stack F. The destination to which the drainage vaporization unit 8 supplies the ammonia gas may be any facility that detoxifies the ammonia gas, such as a dilution device or the like.

[0033] The rainwater discharge section 9 discharges the rainwater accumulated in the liquid collection recess 4c to the outside of the liquid retaining dike 4. Such a rainwater discharge section 9 includes a rainwater pump 9a, a rainwater guiding pipe 9b, and a rainwater side groove 9c. As shown in FIG. 1, in this embodiment, a rainwater recess 4d that is recessed downward with respect to a part of the bottom of the liquid collection recess 4c is provided. Usually, the amount of rainwater accumulated inside the liquid retaining dike 4 is small compared to the liquefied ammonia X in the event of leakage. Therefore, by providing the rainwater recess 4d in the liquid collection recess 4c, the water level of the accumulated rainwater can be increased, making it possible to easily suck water with the rainwater pump 9a.

[0034] The rainwater pump 9a is disposed in the rainwater recess 4d, sucks the rainwater accumulated in the rainwater recess 4d, and discharges the rainwater to the rainwater guiding pipe 9b. For example, the rainwater pump 9a is driven under the control of a control device (not shown) when the water level is such that rainwater can be sucked, and is stopped when the water level is such that rainwater cannot be sucked.

[0035] The rainwater guiding pipe 9b is a pipe connected to the rainwater pump 9a, and guides the rainwater pumped by the rainwater pump 9a to the outside of the liquid retaining dike 4. The rainwater side groove 9c is provided outside the liquid retaining dike 4, and guides the rainwater discharged from the rainwater guiding pipe 9b to a predetermined location (such as a drainage ditch, etc.).

[0036] In this embodiment, the liquid retaining dike 4, the heat-insulating coating float 5, the liquid discharge section 6, the strainer 7, the liquid discharge vaporization section 8, and the rainwater discharge section 9 constitute a liquid leakage treatment facility 20. Such a liquid leakage treatment facility 20 temporarily stores the liquefied ammonia X while suppressing the volatilization of the leaked liquefied ammonia X when the liquefied ammonia X leaks, and further sends the stored liquefied ammonia X to the outside of the liquid retaining dike 4.

[0037] The return pipe 10 is a pipe connecting the liquid discharge guiding pipe 6b of the liquid discharge section 6 and the delivery pipe 3a of the ammonia delivery section 3. The return pipe 10 is connected to a portion upstream of the vaporizer 3c of the delivery pipe 3a. Such a return pipe 10 returns the liquefied ammonia X sent from the liquid discharge section 6 to the delivery pipe 3a.

[0038] Note that a valve (not shown) is provided in the return pipe 10. By such a valve, the return pipe 10 can change its open / closed state. When the return pipe 10 is open, part or all of the liquefied ammonia X pumped by the drain pump 6a of the drain section 6 is supplied to the delivery pipe 3a through the return pipe 10. Therefore, part or all of the leaked liquefied ammonia X can be supplied to the supply destination.

[0039] The transfer pipe 11 is a pipe that connects the drain guide pipe 6b of the drain section 6 and another storage tank. For example, the liquefied ammonia facility 1 of the present embodiment may include a plurality of storage tanks 2. In such a case, the other storage tank is a storage tank 2 in which no leakage of liquefied ammonia X has occurred. Also, the transfer pipe 11 may be connected to another storage tank provided separately from the liquefied ammonia facility 1 of the present embodiment.

[0040] Note that a valve (not shown) is provided in the transfer pipe 11. By such a valve, the transfer pipe 11 can change its open / closed state. When the transfer pipe 11 is open, part or all of the liquefied ammonia X pumped by the drain pump 6a of the drain section 6 is supplied to another storage tank through the transfer pipe 11. Therefore, part or all of the leaked liquefied ammonia X can be transferred to another storage tank.

[0041] In such a liquefied ammonia facility 1 of the present embodiment, when no leakage of liquefied ammonia X has occurred, the liquefied ammonia X stored in the storage tank 2 is discharged from the storage tank 2 by the delivery pump 3b. The liquefied ammonia X discharged from the storage tank 2 is guided to the delivery pipe 3a, vaporized in the vaporizer 3c, and supplied as ammonia gas to the supply destination.

[0042] On the one hand, in the liquefied ammonia facility 1 of the present embodiment, when leakage of the liquefied ammonia X occurs, the leaked liquefied ammonia X flows out into the storage space of the liquid retaining dike 4. The liquefied ammonia X that has flowed out into the storage space of the liquid retaining dike 4 accumulates on the bottom 4a of the liquid retaining dike 4, causing the heat-insulating coating float 5 to float. As a result, the liquid surface of the liquefied ammonia X stored in the liquid retaining dike 4 is covered by the heat-insulating coating float 5, suppressing the volatilization of the liquefied ammonia X.

[0043] In addition, the liquefied ammonia X stored in the liquid retaining dike 4 is sent out of the liquid retaining dike 4 through the drain guide pipe 6b by the drain pump 6a inside the liquid collecting recess 4c. The liquefied ammonia X sent out of the liquid retaining dike 4 is supplied to the ammonia sending section 3 through, for example, the return pipe 10, and further supplied as ammonia gas to the supply destination. Also, the liquefied ammonia X sent out of the liquid retaining dike 4 is supplied to another storage tank through, for example, the transfer pipe 11 and stored.

[0044] Also, the liquefied ammonia X sent out of the liquid retaining dike 4 is supplied to, for example, the drain vaporization section 8. The liquefied ammonia X supplied to the drain vaporization section 8 is heated and vaporized by the electric heater 8b inside the drain tank 8a. The ammonia gas generated by vaporization with the electric heater 8b is supplied to the flare stack F and incinerated in the present embodiment.

[0045] The liquid leakage treatment facility 20 of the present embodiment as described above includes a liquid retaining dike 4, a heat-insulating coating float 5, and a drain section 6. The liquid retaining dike 4 can store the leaked liquefied ammonia X and is open upward. The heat-insulating coating floats 5 are laid in a plurality on the bottom 4a of the liquid retaining dike 4 and are floated by the liquefied ammonia X stored in the liquid retaining dike 4. The drain section 6 sends out the liquefied ammonia X stored in the liquid retaining dike 4 to the outside of the liquid retaining dike 4.

[0046] In such a leakage treatment facility 20 of the present embodiment, a heat-insulating coating float 5 is laid and arranged on the bottom 4a of the liquid retaining dike 4. Therefore, when liquefied ammonia X is stored in the liquid retaining dike 4, the heat-insulating coating float 5 floats on the liquid surface of the liquefied ammonia X, and the volatilization of the liquefied ammonia X is suppressed. Therefore, according to the leakage treatment facility 20 of the present embodiment, it is possible to suppress the amount of vaporized gas (ammonia gas in this embodiment) released into the atmosphere when the liquefied ammonia X leaks.

[0047] Moreover, in the leakage treatment facility 20 of the present embodiment, a plurality of heat-insulating coating floats 5 are connected with gaps between them. According to such a leakage treatment facility 20 of the present embodiment, even if the leakage location of the liquefied ammonia X is above the heat-insulating coating float 5, the leaked liquefied ammonia X flows into the lower part of the heat-insulating coating float 5 through the gaps between the heat-insulating coating floats 5. Therefore, even if the leakage location of the liquefied ammonia X is above the heat-insulating coating float 5, the volatilization of the liquefied ammonia X can be suppressed.

[0048] In addition, in the leakage treatment facility 20 of the present embodiment, the liquid retaining dike 4 has a liquid collecting recess 4c. The liquid collecting recess 4c is provided in a part of the bottom 4a and is formed to be recessed downward. The liquid discharge unit 6 includes a liquid discharge pump 6a and a liquid discharge guide pipe 6b. The liquid discharge pump 6a is arranged inside the liquid collecting recess 4c. The liquid discharge guide pipe 6b guides the liquefied ammonia X pumped from the liquid discharge pump 6a to the outside of the liquid retaining dike 4.

[0049] In such a leakage treatment facility 20 of the present embodiment, the leaked liquefied ammonia X can be collected in the liquid collecting recess 4c. Moreover, the liquefied ammonia X collected in the liquid collecting recess 4c can be sent to the outside of the liquid retaining dike 4 using the liquid discharge pump 6a. Therefore, according to the leakage treatment facility 20 of the present embodiment, it is possible to prevent the leaked liquefied ammonia X from remaining inside the liquid retaining dike 4.

[0050] In addition, the liquid leakage treatment facility 20 of the present embodiment includes a strainer 7. The strainer 7 is disposed in the liquid collection recess 4c and suppresses the intrusion of foreign matter into the drainage pump 6a. According to such a liquid leakage treatment facility 20 of the present embodiment, it is possible to prevent the situation where the leaked liquefied ammonia X cannot be sent out of the liquid retaining dike 4 due to the intrusion of foreign matter into the drainage pump 6a.

[0051] In addition, the liquid leakage treatment facility 20 of the present embodiment includes a rainwater discharge section 9. The rainwater discharge section 9 discharges the rainwater accumulated in the liquid collection recess 4c to the outside of the liquid retaining dike 4. According to such a liquid leakage treatment facility 20 of the present embodiment, it is possible to suppress the presence of rainwater inside the liquid retaining dike 4. For this reason, it is possible to prevent the leaked liquefied ammonia X from coming into contact with rainwater and vaporizing. Therefore, according to the liquid leakage treatment facility 20 of the present embodiment, it is possible to more reliably suppress the volatilization of the liquefied ammonia X.

[0052] In addition, the liquid leakage treatment facility 20 of the present embodiment includes a drainage tank 8a and an electric heater 8b. The drainage tank 8a is supplied with the liquefied ammonia X sent from the drainage section 6. The electric heater 8b is disposed inside the drainage tank 8a. According to such a liquid leakage treatment facility 20 of the present embodiment, it is possible to vaporize the leaked liquefied ammonia X and then process it. Therefore, for example, it is possible to process the leaked liquefied ammonia X with a decontamination facility such as a flare stack F or a dilution device.

[0053] In addition, the liquefied ammonia facility 1 of the present embodiment includes a storage tank 2, a delivery pipe 3a, and a liquid leakage treatment facility 20. The storage tank 2 stores the liquefied ammonia X. The delivery pipe 3a is connected to the storage tank 2 and guides the liquefied ammonia X. The liquid leakage treatment facility 20 can store the liquefied ammonia X leaked from either the storage tank 2 or the delivery pipe 3a.

[0054] According to such a liquefied ammonia facility 1 of the present embodiment, even if the liquefied ammonia X leaks from either the storage tank 2 or the delivery pipe 3a, it is possible to process the liquefied ammonia X with the liquid leakage treatment facility 20.

[0055] Further, in the liquefied ammonia facility 1 of the present embodiment, the delivery pipe 3a guides the liquefied ammonia X stored in the storage tank 2 toward the supply destination. Further, the delivery pipe 3a in the liquefied ammonia facility 1 of the present embodiment includes a return pipe 10. The return pipe 10 returns the liquefied ammonia X sent from the drainage section 6 to the delivery pipe 3a.

[0056] According to the liquefied ammonia facility 1 of the present embodiment as described above, part or all of the liquefied ammonia X pumped by the drainage pump 6a of the drainage section 6 can be supplied to the supply destination via the return pipe 10. Therefore, it becomes possible to effectively utilize the leaked liquefied ammonia X.

[0057] Further, the liquefied ammonia facility 1 of the present embodiment includes a transfer pipe 11. The transfer pipe 11 guides the liquefied ammonia X sent from the drainage section 6 to another storage tank. According to the liquefied ammonia facility 1 of the present embodiment as described above, part or all of the liquefied ammonia X pumped by the drainage pump 6a of the drainage section 6 can be supplied to another storage tank via the transfer pipe 11. Therefore, it becomes possible to effectively utilize the leaked liquefied ammonia X.

[0058] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 2. In the description of the present embodiment, the description of the same parts as those in the first embodiment above will be omitted or simplified.

[0059] FIG. 2 is a schematic configuration diagram showing the liquid leakage treatment facility 20A of the present embodiment. As shown in this figure, the liquid leakage treatment facility 20A of the present embodiment is disposed below the ammonia pipe H through which the liquefied ammonia X flows. Further, on the bottom 4a of the liquid retaining dike 4 of the liquid leakage treatment facility 20A, the storage tank 2 as in the first embodiment is not provided.

[0060] When liquefied ammonia X leaks from the ammonia pipe H, such a liquid leakage treatment facility 20A of the present embodiment can store the leaked liquefied ammonia X with the liquid retaining dike 4. The liquefied ammonia X stored in the liquid retaining dike 4 is sent out of the liquid retaining dike 4 by the liquid discharging part 6.

[0061] Also in such a liquid leakage treatment facility 20A of the present embodiment, similar to the liquid leakage treatment facility 20 of the first embodiment, the heat insulating coating floats 5 are spread and arranged on the bottom 4a of the liquid retaining dike 4. For this reason, when liquefied ammonia X is stored in the liquid retaining dike 4, the heat insulating coating floats 5 float on the liquid surface of the liquefied ammonia X, and the volatilization of the liquefied ammonia X is suppressed. Therefore, according to the liquid leakage treatment facility 20A of the present embodiment, it is possible to suppress the amount of vaporized gas (ammonia gas in this embodiment) released into the atmosphere when the liquefied ammonia X leaks.

[0062] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. Needless to say, the present invention is not limited to the above embodiments. The various shapes, combinations, etc. of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

[0063] For example, in the above embodiment, the configuration including the return pipe 10 and the transfer pipe 11 has been described. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration that does not include either or both of the return pipe 10 and the transfer pipe 11.

[0064] Incidentally, the above embodiment can also be described, for example, as in the following supplementary note.

[0065] (Supplementary Note 1) A liquid retaining dike capable of storing the leaked liquefied gas and open upward, A plurality of heat insulating coating floats arranged by spreading on the bottom of the liquid retaining dike and floated by the liquefied gas stored in the liquid retaining dike, A liquid discharge section for discharging the liquefied gas stored in the liquid retaining dike to the outside of the liquid retaining dike, and A liquid leakage treatment facility characterized by comprising the same.

[0066] (Appendix 2) The liquid leakage treatment facility according to Appendix 1, characterized in that a plurality of the heat-insulating coating floats are connected with gaps therebetween.

[0067] (Appendix 3) The liquid retaining dike is provided in a part of the bottom and has a liquid collecting recess that is recessed downward, The liquid discharge section is A liquid discharge pump disposed inside the liquid collecting recess, and A guide pipe for guiding the liquefied gas pumped from the liquid discharge pump to the outside of the liquid retaining dike and is provided with The liquid leakage treatment facility according to Appendix 1 or 2, characterized by the above.

[0068] (Appendix 4) The liquid leakage treatment facility according to Appendix 3, characterized by comprising a strainer that is disposed in the liquid collecting recess and suppresses the intrusion of foreign matter into the liquid discharge pump.

[0069] (Appendix 5) The liquid leakage treatment facility according to Appendix 3 or 4, characterized by comprising a rainwater discharge section for discharging rainwater accumulated in the liquid collecting recess to the outside of the liquid retaining dike.

[0070] (Appendix 6) A liquid discharge tank to which the liquefied gas sent from the liquid discharge section is supplied, and A heater disposed inside the liquid discharge tank and is provided with

[0071] (Appendix 7) A storage tank for storing the liquefied gas, and A connection pipe connected to the storage tank for guiding the liquefied gas, The liquid leakage treatment facility according to any one of Appendices 1 to 6 capable of storing the liquefied gas leaked from at least one of the storage tank and the connecting pipe, and A liquefied gas tank facility, characterized by comprising the same.

[0072] (Appendix 8) A supply pipe for guiding the liquefied gas stored in the storage tank toward a supply destination, and A return pipe for returning the liquefied gas sent out from the drainage section to the supply pipe. The liquefied gas tank facility according to Appendix 7, characterized by comprising the same.

[0073] (Appendix 9) The liquefied gas tank facility according to Appendix 7 or 8, characterized by comprising a transfer pipe for guiding the liquefied gas sent out from the drainage section to another storage tank.

Explanation of Reference Numerals

[0074] 1... Liquefied ammonia facility (liquefied gas tank facility), 2... Storage tank, 3... Ammonia sending section, 3a... Sending pipe (connecting pipe, supply pipe), 3b... Sending pump, 3c... Vaporizer, 4... Liquid retaining dike, 4a... Bottom, 4b... Enclosing wall, 4c... Liquid collecting recess, 4d... Rainwater recess, 5... Heat-insulating coating float, 6... Drainage section, 6a... Drainage pump, 6b... Drainage guiding pipe (guiding pipe), 7... Strainer, 8... Drainage vaporizing section, 8a... Drainage tank, 8b... Electric heater (heater), 9... Rainwater discharge section, 9a... Rainwater pump, 9b... Rainwater guiding pipe, 9c... Rainwater side groove, 10... Return pipe, 11... Transfer pipe, 20... Liquid leakage treatment facility, 20A... Liquid leakage treatment facility, F... Flare stack, H... Ammonia pipe, X... Liquefied ammonia (liquefied gas)

Claims

1. A liquid retaining dike capable of storing leaked liquefied gas and open upward, A plurality of heat-insulating coated floats laid at the bottom of the liquid retaining dike and floated by the liquefied gas stored in the liquid retaining dike, A liquid discharging section for discharging the liquefied gas stored in the liquid retaining dike to the outside of the liquid retaining dike A liquid leakage treatment facility characterized by comprising.

2. The liquid leakage treatment facility according to claim 1, wherein the plurality of heat-insulating coated floats are connected with gaps therebetween.

3. The liquid retaining dike is provided at a part of the bottom and has a liquid collecting recess that is recessed downward, The liquid discharging section is A liquid discharging pump disposed inside the liquid collecting recess, A guiding pipe for guiding the liquefied gas pumped from the liquid discharging pump to the outside of the liquid retaining dike Comprising The liquid leakage treatment facility according to claim 1 or 2, characterized in that.

4. The liquid leakage treatment facility according to claim 3, further comprising a strainer disposed in the liquid collecting recess to prevent foreign matter from entering the liquid discharging pump.

5. The liquid leakage treatment facility according to claim 3, further comprising a rainwater discharging section for discharging rainwater accumulated in the liquid collecting recess to the outside of the liquid retaining dike.

6. A liquid discharging tank to which the liquefied gas sent from the liquid discharging section is supplied, A heater disposed inside the liquid discharging tank The liquid leakage treatment facility according to claim 1 or 2, characterized in that it comprises.

7. A storage tank for storing the liquefied gas, A connecting pipe connected to the storage tank for guiding the liquefied gas, The liquid leakage treatment facility according to claim 1 or 2 capable of storing the liquefied gas leaked from at least one of the storage tank and the connecting pipe A liquefied gas tank facility characterized by comprising.

8. A supply pipe for guiding the liquefied gas stored in the storage tank toward a supply destination, A return pipe for returning the liquefied gas sent from the liquid discharging section to the supply pipe The liquefied gas tank facility according to claim 7, characterized in that it comprises.

9. The liquefied gas tank facility according to claim 7, further comprising a transfer pipe for guiding the liquefied gas sent from the liquid discharging section to another storage tank.

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