Liquid leakage treatment facility and liquefied gas tank facility

Abstract

This liquefied gas tank facility comprises: a dike (4) that is capable of storing leaked liquefied ammonia (X) and is open upward; a plurality of heat-insulating covering floats (5) that are disposed to cover a bottom part (4a) of the dike and are caused to float by the liquefied ammonia (X) stored in the dike (4); and a drainage part (6) that sends the liquefied ammonia (X) stored in the dike (4) to the outside of the dike (4).

Description

Liquid leakage treatment equipment and liquefied gas tank equipment

[0001] This disclosure relates to a liquid leakage treatment system and a liquefied gas tank system. This application claims priority to Japanese Patent Application No. 2024-002036, filed on January 10, 2024, the contents of which are incorporated herein by reference.

[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-shelled tank having an inner shell and an outer shell. A rectangular liquid containment dike is provided on the outer periphery of such a double-shelled tank. In a tank facility equipped with such a liquid containment dike, even if liquefied gas leaks from the double-shelled tank, the area of ​​the leaked liquefied gas can be limited to the area surrounded by the liquid containment dike.

[0003] Japanese Patent Application Publication No. 2021-17920

[0004] Conventionally, liquefied natural gas (LNG) and liquefied petroleum gas (LPG) have been widely used as liquefied gases. The toxicity of the vaporized gases of these LNG and LPG is low. Therefore, liquefied gas that leaks and accumulates inside a dike can be released into the atmosphere. However, in recent years, liquefied ammonia has been used as fuel in some cases. Ammonia gas generated by the vaporization of liquefied ammonia is more toxic than LNG or LPG, so it is necessary to suppress the amount released into the atmosphere even in the event of a leak. Furthermore, even in the case of LNG or LPG, it is preferable to suppress the amount released into the atmosphere in the event of a leak.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to reduce the amount of vaporized gas released into the atmosphere in the event of a liquefied gas leak.

[0006] The present disclosure employs the following configuration as a means for solving the above problems.

[0007] A first aspect of the present disclosure is a liquid leakage treatment facility comprising a liquid retention dike capable of storing leaked liquefied gas and open toward the top, a plurality of insulating coated floats arranged on the bottom of the liquid retention dike and floated by the liquefied gas stored in the liquid retention dike, and a drainage section that sends the liquefied gas stored in the liquid retention dike outside the liquid retention dike.

[0008] In addition, a second aspect of the present disclosure is a liquefied gas tank facility comprising a storage tank for storing the liquefied gas, a connecting pipe connected to the storage tank for guiding the liquefied gas, and a leakage treatment facility of the first aspect capable of storing the liquefied gas leaking from at least one of the storage tank and the connecting pipe.

[0009] In the present disclosure, heat-insulating coated floats are laid out along the bottom of the dike. Therefore, when liquefied gas is stored in the dike, the heat-insulating coated floats rise to the surface of the liquefied gas, and the thermal insulation provided by the coated floats suppresses the evaporation of the liquefied gas. Therefore, according to the present disclosure, it is possible to suppress the amount of vaporized gas released into the atmosphere in the event of a liquefied gas leak.

[0010] 1 is a schematic configuration diagram of a liquefied ammonia facility according to a first embodiment of the present disclosure; FIG. 2 is a schematic configuration diagram of a liquid leakage treatment facility according to a second embodiment of the present disclosure;

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

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

[0013] Fig. 1 is a schematic diagram of a liquefied ammonia facility 1 (liquefied gas tank facility) of this embodiment. Fig. 1 shows a state in which liquefied ammonia X, which will be 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 barrier 4, a heat-insulating coated float 5, a liquid discharge section 6, a strainer 7, a liquid discharge vaporization section 8, a rainwater discharge 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 having a metal inner shell and a metal outer shell. The storage tank 2 has a cold insulation material filled between the outer shell and the inner shell, and stores the liquefied ammonia X inside the inner shell at a low temperature. Such a storage tank 2 is provided on a bottom 4a of the dike 4, which will be described later.

[0015] The ammonia delivery unit 3 delivers liquefied ammonia X from the storage tank 2 to an external supply destination. The ammonia delivery unit 3 vaporizes the liquefied ammonia X and delivers the vaporized ammonia gas to the supply destination. As shown in Fig. 1, the ammonia delivery unit 3 includes a delivery pipe 3a (connection pipe), a delivery pump 3b, and a vaporizer 3c.

[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 toward the supply destination. In other words, the delivery pipe 3a is a supply pipe that guides the liquefied ammonia X stored in the storage tank 2 toward 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 a midpoint of the delivery pipe 3a. The delivery pump 3b pumps liquefied ammonia X from the storage tank 2 side toward the supply destination side. The delivery pump 3b is installed, for example, on the bottom 4a of the liquid barrier dyke 4. The delivery pump 3b is protected from 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 disposed in the middle of the delivery pipe 3a, downstream of the delivery pump 3b. The vaporizer 3c vaporizes the liquefied ammonia X supplied from the storage tank 2 and discharges it as ammonia gas. A superheater may be provided downstream of the vaporizer 3c.

[0019] The dike 4 prevents the exposed liquefied ammonia X from leaking to the outside when the liquefied ammonia X leaks from at least one of the storage tank 2 and the delivery pipe 3 a. In other words, the dike 4 can store the leaked liquefied ammonia X.

[0020] 1, the dike 4 has a bottom 4a that supports the storage tank 2 and other components 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 upward. Such a dike 4 is made of, for example, concrete.

[0021] The bottom 4a of the dike 4 is provided with a downwardly recessed liquid collection recess 4c. The liquid collection recess 4c is located at the lowest position in the storage space of the dike 4 and is the portion where liquefied ammonia X is most likely to accumulate. Therefore, when liquefied ammonia X leaks into the dike 4, the liquefied ammonia X accumulates in the liquid collection recess 4c at the earliest stage. Furthermore, when the liquefied ammonia X stored in the dike 4 is discharged, the liquefied ammonia X accumulates in the liquid collection recess 4c until the latest. The location of the liquid collection recess 4c is not particularly limited, but it is preferably provided near the surrounding wall 4b in order to shorten the path for discharging the stored liquefied ammonia X to the outside of the dike 4. Note that, in order to improve the collection of liquefied ammonia X in the liquid collection recess 4c, a slope descending toward the liquid collection recess 4c may be provided in a portion of the bottom 4a, etc.

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

[0023] Each of the thermally insulating coated floats 5 is connected to the adjacently arranged other thermally insulating coated floats 5 with a gap therebetween by a connecting part (not shown). In other words, a gap is provided between two adjacent thermally insulating coated floats 5. Even if liquefied ammonia X leaks above a thermally insulating coated float 5, the liquefied ammonia X will flow below the thermally insulating coated float 5 through the gap. When liquefied ammonia X is stored in the dike 4, such a thermally insulating coated float 5 is floated by the liquefied ammonia X and floats on the liquid surface of the liquefied ammonia X.

[0024] That is, when liquefied ammonia X is not leaking, the heat-insulating coated float 5 is placed on the bottom 4a of the dike 4. On the other hand, when liquefied ammonia X is leaking, the heat-insulating coated float 5 floats on the liquid surface of the liquefied ammonia X. 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 collection recess 4c. Therefore, the heat-insulating coated float 5 located above the liquid collection recess 4c is placed on the strainer 7 when no liquefied ammonia X is leaking. The strainer 7 has, for example, a mesh structure.

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

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

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

[0029] The strainer 7 is disposed above the liquid collection recess 4c and prevents foreign matter from entering below. Such a strainer 7 can prevent foreign matter from entering the drainage pump 6a. As shown in FIG. 1 , in this embodiment, the strainer 7 is disposed at the top of the liquid collection recess 4c and is formed so as to cover the upper end opening of the liquid collection recess 4c. However, the shape of the strainer 7 is not particularly limited, and it may be, for example, a basket-like shape that covers the suction port of the drainage pump 6a or the entire drainage pump 6a.

[0030] The waste liquid vaporization unit 8 vaporizes the liquefied ammonia X supplied from the drainage unit 6. The waste liquid vaporization unit 8 includes a waste liquid tank 8a and an electric heater 8b (heater). The waste liquid tank 8a is connected to the drainage pump 6a via the drainage guide piping 6b. Therefore, the liquefied ammonia X discharged from the waste liquid tank 8a is guided to the drainage guide piping 6b and supplied to the waste liquid tank 8a. The waste liquid 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 waste liquid tank 8a and generates heat when power is supplied from the outside. The electric heater 8b heats the liquefied ammonia X stored inside the waste liquid tank 8a to vaporize it into ammonia gas. Note that a heater using seawater, steam, or the like may be installed instead of the electric heater 8b.

[0032] In this embodiment, the effluent 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 of the ammonia gas supplied by the effluent vaporization unit 8 is not limited to the flare stack F. The destination of the ammonia gas supplied by the effluent vaporization unit 8 may be any facility that renders the ammonia gas harmless, such as a dilution device.

[0033] The rainwater drain 9 discharges rainwater accumulated in the liquid collection recess 4c to the outside of the liquid retention dam 4. Such a rainwater drain 9 includes a rainwater pump 9a, a rainwater guide pipe 9b, and a rainwater gutter 9c. As shown in FIG. 1, in this embodiment, a rainwater recess 4d is provided that is recessed downward from a portion of the bottom of the liquid collection recess 4c. Normally, the amount of rainwater that accumulates inside the liquid retention dam 4 is small compared to the amount of liquefied ammonia X that leaks. Therefore, by providing the rainwater recess 4d in the liquid collection recess 4c, the level of the accumulated rainwater can be increased, making it possible for the rainwater pump 9a to easily absorb the water.

[0034] The rainwater pump 9a is disposed in the rainwater recess 4d, and draws in rainwater accumulated in the rainwater recess 4d and discharges the rainwater to the rainwater guide pipe 9b. For example, under the control of a control device (not shown), the rainwater pump 9a is driven when the rainwater level is high enough to absorb it, and is stopped when the rainwater level is low enough to absorb it.

[0035] The rainwater guide 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 levee 4. The rainwater gutter 9c is provided outside the levee 4 and guides the rainwater discharged from the rainwater guide pipe 9b to a predetermined location (such as a drainage ditch).

[0036] In this embodiment, the liquid retaining dike 4, the heat-insulating coated float 5, the liquid drainage section 6, the strainer 7, the liquid drainage vaporization section 8, and the rainwater drainage section 9 constitute a liquid leakage treatment facility 20. When liquefied ammonia X leaks, the liquid leakage treatment facility 20 temporarily stores the liquefied ammonia X while suppressing the volatilization of the leaked liquefied ammonia X, 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 that connects the discharged liquid guide pipe 6b of the liquid discharge unit 6 and the delivery pipe 3a of the ammonia delivery unit 3. The return pipe 10 is connected to a portion of the delivery pipe 3a that is upstream of the vaporizer 3c. The return pipe 10 returns the liquefied ammonia X delivered from the liquid discharge unit 6 to the delivery pipe 3a.

[0038] The return pipe 10 is provided with a valve (not shown). The return pipe 10 can be opened or closed by using this valve. When the return pipe 10 is open, part or all of the liquefied ammonia X pumped by the drainage pump 6a of the drainage section 6 is supplied to the delivery pipe 3a via 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 discharged liquid guide pipe 6b of the discharge section 6 to another storage tank. For example, the liquefied ammonia facility 1 of this embodiment may be provided with a plurality of storage tanks 2. In such a case, the other storage tank is a storage tank 2 from which no leakage of liquefied ammonia X has occurred. Furthermore, the transfer pipe 11 may be connected to another storage tank that is provided separately from the liquefied ammonia facility 1 of this embodiment.

[0040] The transfer pipe 11 is provided with a valve (not shown). The open / close state of the transfer pipe 11 can be changed by this valve. When the transfer pipe 11 is open, part or all of the liquefied ammonia X pressure-fed by the drainage pump 6a of the drainage section 6 is supplied to another storage tank via the transfer pipe 11. Therefore, part or all of the leaked liquefied ammonia X can be transferred to another storage tank.

[0041] In the liquefied ammonia facility 1 of this embodiment, when no leakage of the liquefied ammonia X occurs, 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, and vaporized in the vaporizer 3c to become ammonia gas, which is then supplied to the supply destination.

[0042] On the other hand, in the liquefied ammonia facility 1 of this embodiment, if a leak of liquefied ammonia X occurs, the leaked liquefied ammonia X flows out into the storage space of the liquid barrier 4. The liquefied ammonia X that flows out into the storage space of the liquid barrier 4 accumulates on the bottom 4a of the liquid barrier 4 and causes the heat-insulating coated float 5 to float up. As a result, the liquid surface of the liquefied ammonia X stored in the liquid barrier 4 is covered with the heat-insulating coated float 5, and volatilization of the liquefied ammonia X is suppressed.

[0043] The liquefied ammonia X stored in the dike 4 is discharged to the outside of the dike 4 via a discharge guide pipe 6b by a discharge pump 6a inside the liquid collection recess 4c. The liquefied ammonia X discharged to the outside of the dike 4 is supplied to the ammonia discharge section 3 via, for example, a return pipe 10, and is further supplied to the destination as ammonia gas. The liquefied ammonia X discharged to the outside of the dike 4 is supplied to another storage tank via, for example, a transfer pipe 11, and stored therein.

[0044] The liquefied ammonia X sent to the outside of the dike 4 is supplied, for example, to the waste liquid vaporizer 8. The liquefied ammonia X supplied to the waste liquid vaporizer 8 is heated and vaporized by an electric heater 8b inside the waste liquid tank 8a. In this embodiment, the ammonia gas generated by vaporization by the electric heater 8b is supplied to the flare stack F and incinerated.

[0045] The liquid leak treatment equipment 20 of this embodiment as described above comprises a liquid barrier 4, a heat-insulating coated float 5, and a liquid drainage section 6. The liquid barrier 4 is capable of storing leaked liquefied ammonia X and is open facing upward. A plurality of heat-insulating coated floats 5 are arranged in a line on the bottom 4a of the liquid barrier 4 and are floated by the liquefied ammonia X stored in the liquid barrier 4. The liquid drainage section 6 sends the liquefied ammonia X stored in the liquid barrier 4 to the outside of the liquid barrier 4.

[0046] In the liquid leakage treatment equipment 20 of this embodiment, the heat-insulating coated floats 5 are arranged so as to cover the bottom 4a of the liquid barrier 4. Therefore, when liquefied ammonia X is stored in the liquid barrier 4, the heat-insulating coated floats 5 float to the surface of the liquefied ammonia X, thereby suppressing the volatilization of the liquefied ammonia X. Therefore, with the liquid leakage treatment equipment 20 of this embodiment, it is possible to suppress the amount of vaporized gas (ammonia gas in this embodiment) released into the atmosphere when liquefied ammonia X leaks.

[0047] Furthermore, in the liquid leakage treatment equipment 20 of this embodiment, the multiple heat-insulating coated floats 5 are arranged with gaps between them. According to the liquid leakage treatment equipment 20 of this embodiment, even if the leakage point of the liquefied ammonia X is above the heat-insulating coated floats 5, the liquefied ammonia X that has flowed out flows below the heat-insulating coated floats 5 through the gaps between the heat-insulating coated floats 5. Therefore, even if the leakage point of the liquefied ammonia X is above the heat-insulating coated floats 5, the volatilization of the liquefied ammonia X can be suppressed.

[0048] In the liquid leakage treatment equipment 20 of this embodiment, the dike 4 has a liquid collection recess 4c. The liquid collection recess 4c is provided in a portion of the bottom 4a and is recessed downward. The drainage section 6 includes a drainage pump 6a and a drainage guide pipe 6b. The drainage pump 6a is disposed inside the liquid collection recess 4c. The drainage guide pipe 6b guides the liquefied ammonia X pumped from the drainage pump 6a to the outside of the dike 4.

[0049] In the liquid leakage treatment equipment 20 of this embodiment, the leaked liquefied ammonia X can be collected in the liquid collection recess 4c. Furthermore, the liquefied ammonia X collected in the liquid collection recess 4c can be sent to the outside of the liquid barrier 4 using the liquid drainage pump 6a. Therefore, the liquid leakage treatment equipment 20 of this embodiment can prevent the leaked liquefied ammonia X from remaining inside the liquid barrier 4.

[0050] The liquid leakage treatment equipment 20 of this embodiment also includes a strainer 7. The strainer 7 is disposed in the liquid collection recess 4c and prevents foreign matter from entering the drainage pump 6a. The liquid leakage treatment equipment 20 of this embodiment can prevent a situation in which the leaked liquefied ammonia X cannot be sent out of the liquid barrier levee 4 due to foreign matter entering the drainage pump 6a.

[0051] The liquid leakage treatment equipment 20 of this embodiment also includes a rainwater drain 9. The rainwater drain 9 drains rainwater accumulated in the liquid collection recess 4c to the outside of the liquid retention dike 4. The liquid leakage treatment equipment 20 of this embodiment can prevent rainwater from being present inside the liquid retention dike 4. This prevents the leaked liquefied ammonia X from coming into contact with rainwater and evaporating. Therefore, the liquid leakage treatment equipment 20 of this embodiment can more reliably suppress the volatilization of the liquefied ammonia X.

[0052] The liquid leakage treatment equipment 20 of this embodiment also includes a waste liquid tank 8a and an electric heater 8b. The waste liquid tank 8a is supplied with liquefied ammonia X delivered from the drainage section 6. The electric heater 8b is disposed inside the waste liquid tank 8a. According to the liquid leakage treatment equipment 20 of this embodiment, the leaked liquefied ammonia X can be vaporized and then treated. Therefore, for example, the leaked liquefied ammonia X can be treated using abatement equipment such as a flare stack F or a dilution device.

[0053] The liquefied ammonia facility 1 of this embodiment also includes a storage tank 2, a delivery pipe 3a, and a liquid leakage treatment facility 20. The storage tank 2 stores 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 liquefied ammonia X that has leaked from either the storage tank 2 or the delivery pipe 3a.

[0054] According to the liquefied ammonia equipment 1 of this embodiment, even if the liquefied ammonia X leaks from either the storage tank 2 or the delivery pipe 3a, the liquefied ammonia X can be treated by the leakage treatment equipment 20.

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

[0056] According to the liquefied ammonia facility 1 of this embodiment, a 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 is possible to effectively utilize the leaked liquefied ammonia X.

[0057] The liquefied ammonia facility 1 of this embodiment also includes a transfer pipe 11. The transfer pipe 11 guides the liquefied ammonia X delivered from the drainage section 6 to another storage tank. According to the liquefied ammonia facility 1 of this embodiment, 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 disclosure will be described with reference to Fig. 2. In the description of this embodiment, the description of the same parts as those in the first embodiment will be omitted or simplified.

[0059] 2 is a schematic diagram showing the configuration of a liquid leakage treatment equipment 20A of this embodiment. As shown in this figure, the liquid leakage treatment equipment 20A of this embodiment is disposed below an ammonia pipe H through which liquefied ammonia X flows. Furthermore, unlike the first embodiment, a storage tank 2 is not provided on the bottom 4a of the liquid barrier dyke 4 of the liquid leakage treatment equipment 20A.

[0060] In the case where liquefied ammonia X leaks from the ammonia piping H, the liquid leakage treatment equipment 20A of this embodiment can store the leaked liquefied ammonia X in the liquid barrier dyke 4. The liquefied ammonia X stored in the liquid barrier dyke 4 is discharged to the outside of the liquid barrier 4 by the drainage section 6.

[0061] In the liquid leakage treatment equipment 20A of this embodiment, similarly to the liquid leakage treatment equipment 20 of the first embodiment, the heat-insulating coated floats 5 are arranged to cover 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 coated floats 5 float to the surface of the liquefied ammonia X, thereby suppressing the volatilization of the liquefied ammonia X. Therefore, with the liquid leakage treatment equipment 20A of this embodiment, it is possible to suppress the amount of vaporized gas (ammonia gas in this embodiment) released into the atmosphere when liquefied ammonia X leaks.

[0062] While the preferred embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to the above-described embodiments. The shapes and combinations of the components shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present disclosure.

[0063] For example, in the above embodiment, a configuration including the return pipe 10 and the transfer pipe 11 has been described. However, the present disclosure 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] The above embodiment can also be described as follows, for example:

[0065] (Appendix 1) A liquid leakage treatment facility comprising: a liquid retention dike capable of storing leaked liquefied gas and open toward the top; a plurality of heat-insulating coated floats arranged in a line on the bottom of the liquid retention dike and floated by the liquefied gas stored in the liquid retention dike; and a liquid drainage section that sends the liquefied gas stored in the liquid retention dike outside the liquid retention dike.

[0066] (Supplementary Note 2) The liquid leakage treatment facility according to Supplementary Note 1, wherein the plurality of heat-insulating coated floats are arranged with gaps between them.

[0067] (Appendix 3) A liquid leakage treatment facility as described in Appendix 1 or 2, wherein the liquid barrier has a liquid collection recess provided in a part of the bottom and recessed downward, and the liquid drainage section comprises: a liquid drainage pump arranged inside the liquid collection recess; and a guide pipe that guides the liquefied gas pumped from the liquid drainage pump to the outside of the liquid barrier.

[0068] (Supplementary Note 4) The liquid leakage treatment facility according to Supplementary Note 3, further comprising a strainer that is disposed in the liquid collection recess and prevents foreign matter from entering the drainage pump.

[0069] (Supplementary Note 5) The liquid leakage treatment facility according to Supplementary Note 3 or 4, further comprising a rainwater discharge section that discharges rainwater accumulated in the liquid collection recess to the outside of the liquid barrier.

[0070] (Appendix 6) The liquid leakage treatment equipment according to any one of appendices 1 to 5, comprising: a drainage tank to which the liquefied gas delivered from the drainage section is supplied; and a heater disposed inside the drainage tank.

[0071] (Appendix 7) A liquefied gas tank facility comprising: a storage tank for storing the liquefied gas; a connecting pipe connected to the storage tank for guiding the liquefied gas; and a liquid leakage treatment facility according to any one of Appendices 1 to 6, capable of storing the liquefied gas leaking from at least one of the storage tank and the connecting pipe.

[0072] (Appendix 8) A liquefied gas tank facility according to appendix 7, comprising: a supply pipe that guides the liquefied gas stored in the storage tank toward a supply destination; and a return pipe that returns the liquefied gas discharged from the discharge section to the supply pipe.

[0073] (Supplementary Note 9) The liquefied gas tank facility according to Supplementary Note 7 or 8, further comprising a transfer pipe for guiding the liquefied gas discharged from the discharge section to another storage tank.

[0074] In the present disclosure, heat-insulating coated floats are laid out along the bottom of the dike. Therefore, when liquefied gas is stored in the dike, the heat-insulating coated floats rise to the surface of the liquefied gas, and the thermal insulation provided by the coated floats suppresses the evaporation of the liquefied gas. Therefore, according to the present disclosure, it is possible to suppress the amount of vaporized gas released into the atmosphere in the event of a liquefied gas leak.

[0075] 1... Liquefied ammonia equipment (liquefied gas tank equipment), 2... Storage tank, 3... Ammonia delivery section, 3a... Delivery piping (connection piping, supply piping), 3b... Delivery pump, 3c... Vaporizer, 4... Liquid barrier, 4a... Bottom, 4b... Enclosure wall, 4c... Liquid collection recess, 4d... Rainwater recess, 5... Heat-insulating coated float, 6... Drainage section, 6a... Drainage pump, 6b... Drainage guide piping (guide piping), 7... Strainer, 8... Drainage vaporization section, 8a... Drainage tank, 8b... Electric heater (heater), 9... Rainwater discharge section, 9a... Rainwater pump, 9b... Rainwater guide piping, 9c... Rainwater gutter, 10... Return piping, 11... Transfer piping, 20... Liquid leakage treatment equipment, 20A... Liquid leakage treatment equipment, F... Flare stack, H... Ammonia piping, X... Liquefied ammonia (liquefied gas)

Claims

1. A liquid leakage treatment facility comprising 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, and a liquid discharging section for discharging the liquefied gas stored in the liquid retaining dike to the outside of the liquid retaining dike.

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

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

4. The liquid leakage treatment facility according to claim 3, further comprising a strainer arranged 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. The liquid leakage treatment facility according to claim 1 or 2, comprising a liquid discharging tank to which the liquefied gas sent from the liquid discharging section is supplied, and a heater arranged inside the liquid discharging tank.

7. A liquefied gas tank facility comprising a storage tank for storing the liquefied gas, a connecting pipe connected to the storage tank for guiding the liquefied gas, and 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.

8. The liquefied gas tank facility according to claim 7, comprising 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 from the liquid discharging section to the supply pipe.

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.

Images