Liquefied gas vaporizer unit

Abstract

To make it possible to restrain a rise in the liquid level of liquefied gas accumulated in a lower part of a container when the liquefied gas is vaporized, and discharge the liquefied gas inside the container without using a pump even when the liquid level has risen.SOLUTION: A liquefied gas vaporizer unit comprises a vertical container 2a in which a horizontal cross section area of a heat exchange space K to which liquefied ammonia X is supplied is smaller than a vertical cross section area thereof, a liquefied ammonia supply part 3 for supplying the liquefied ammonia X to the heat exchange space K of the vertical container 2a, a heating fluid guide pipe 2d inserted into the heat exchange space K of the vertical container 2a, a seawater supply part 4 for supplying seawater Y to the heating fluid guide pipe 2d, a superheater 5b for superheating vaporized gas discharged from the vertical container 2a, and an accumulated liquefied ammonia discharge part 6 for discharging the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a, from the vertical container 2a by using a differential pressure between the heat exchange space K of the vertical container 2a and a discharge destination.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a liquefied gas vaporizer unit.

Background Art

[0002] For example, Patent Document 1 discloses a cryogenic liquefied gas vaporizer that vaporizes a liquefied gas containing a main component and a high-boiling component whose boiling point is higher than that of the main component. The cryogenic liquefied gas vaporizer disclosed in Patent Document 1 includes a horizontally long shell, and vaporizes the liquefied gas by exchanging heat between the liquefied gas and a heating fluid inside the shell.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a liquefied gas in which a high-boiling component is mixed with the main component, the boiling point becomes high, and it is difficult to completely vaporize it with a heat source at a temperature on the low-boiling point side. For example, in the case of a liquefied gas containing liquefied ammonia as the main component and water as the high-boiling component, the boiling point of the liquefied gas approaches the temperature of a heating fluid such as seawater, and unvaporized liquefied gas accumulates at the bottom of the container, causing the liquid level of the liquefied gas to rise. For this reason, the cryogenic liquefied gas vaporizer disclosed in Patent Document 1 is provided with a pump, and the liquefied gas accumulated at the bottom of the container is drawn out of the container using the pump. However, the pump provided in such a cryogenic liquefied gas vaporizer disclosed in Patent Document 1 is a rotating device. Therefore, a backup pump is required as a failure countermeasure, or power for driving is required.

[0005] The present invention has been made in view of the above-described problems, and when vaporizing liquefied gas, it suppresses the rise of the liquid level of the liquefied gas accumulating in the lower part of the container, and even when the liquid level rises, it is possible to discharge the liquefied gas inside the container without using a pump.

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 liquefied gas vaporizer unit for vaporizing liquefied gas, which includes a vertical container having a horizontal cross-sectional area smaller than the vertical cross-sectional area of the internal space to which the liquefied gas is supplied, a liquefied gas supply unit for supplying the liquefied gas to the internal space of the vertical container, a heating fluid guide pipe inserted into the internal space of the vertical container, a heating fluid supply unit for supplying a heating fluid to the heating fluid guide pipe, a superheater for superheating the vaporized gas discharged from the vertical container, and a stagnant liquefied gas discharge unit for discharging the liquefied gas accumulated in the internal space of the vertical container from the vertical container using the differential pressure between the internal space of the vertical container and the discharge destination.

Effects of the Invention

[0008] In the present invention, the vertical container has a horizontal cross-sectional area smaller than the vertical cross-sectional area of the internal space. Therefore, when the vaporized gas vaporized in the internal space of the vertical container rises, the flow path area when the vaporized gas rises is smaller compared to a horizontally long container, and the average flow velocity of the vaporized gas increases. For this reason, the mist-like liquefied gas in the internal space can be entrained by the vaporized gas and discharged to the outside of the vertical container, and can be vaporized in the superheater. Therefore, according to the present invention, the amount of liquefied gas accumulated inside the container (vertical container) can be reduced, and the rise of the liquid level of the liquefied gas accumulated at the lower part of the container can be suppressed. Further, in the present invention, the retained liquefied gas discharge part discharges the liquefied gas accumulated in the internal space of the vertical container from the vertical container using the differential pressure between the internal space of the vertical container and the discharge destination. For this reason, the liquefied gas accumulated in the internal space of the vertical container can be discharged from the vertical container without using a pump. Therefore, according to the present invention, when vaporizing the liquefied gas, the rise of the liquid level of the liquefied gas accumulated at the lower part of the container can be suppressed, and even when the liquid level rises, the liquefied gas inside the container can be discharged without using a pump.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, an embodiment of a liquefied gas vaporizer unit according to the present invention will be described.

[0011] (First Embodiment) In this embodiment, an example in which the liquefied gas vaporizer unit of the present invention is applied to a liquefied ammonia vaporizer unit will be described. However, the liquefied gas vaporizer unit of the present invention is not limited to application to a liquefied ammonia vaporizer unit, and can also be applied to facilities that handle liquefied gases different from liquefied ammonia, such as LPG (Liquefied Petroleum Gas).

[0012] FIG. 1 is a schematic configuration diagram of the liquefied ammonia vaporizer unit 1 of this embodiment. The liquefied ammonia vaporizer unit 1 of this embodiment vaporizes liquefied ammonia X (liquefied gas) by heat-exchanging it with seawater Y (heating fluid). Note that the liquefied ammonia X has, for example, a high-boiling liquid (such as water) mixed with pure liquefied ammonia X. However, in this embodiment, it is simply referred to as liquefied ammonia X. Also, the heating fluid that heat-exchanges with the liquefied ammonia X does not have to be seawater Y. For example, the heating fluid may be fresh water, or river water or lake water may be used.

[0013] As shown in FIG. 1, the liquefied ammonia vaporizer unit 1 of this embodiment includes a vaporizer main body 2, a liquefied ammonia supply section 3 (liquefied gas supply section), a seawater supply section 4 (heating fluid supply section), a delivery section 5, a remaining liquefied ammonia discharge section 6 (remaining liquefied gas discharge section), and a drain pipe 7.

[0014] The vaporizer main body 2 heat-exchanges and vaporizes liquefied ammonia X and seawater Y in a heat exchange space K (internal space). As shown in FIG. 1, this vaporizer main body 2 includes a vertical container 2a, an upper partition wall 2b, a lower partition wall 2c, a heating fluid guide pipe 2d, and a plurality of baffle plates 2e.

[0015] The vertical container 2a is a container whose length dimension in the vertical direction is larger than the length dimension in the horizontal direction. In this embodiment, the vertical container 2a is a cylindrical container whose cross-sectional shape in the horizontal plane is circular.

[0016] Inside the vertical container 2a, a heat exchange space K, an upper space KU, and a lower space KD are provided. These heat exchange space K, upper space KU, and lower space KD are arranged in the vertical direction, and are arranged in the order of the upper space KU, heat exchange space K, and lower space KD from above.

[0017] The heat exchange space K is a space where liquefied ammonia X is supplied and heat exchange occurs between the liquefied ammonia X and seawater Y. In the present embodiment, the heat exchange space K is formed in a vertically long shape in which the length dimension in the vertical direction is larger than the diameter dimension facing the horizontal direction. Such a heat exchange space K has a smaller horizontal cross-sectional area (the cross-sectional area when cut by a horizontal plane) than the vertical cross-sectional area (the cross-sectional area when cut by a vertical plane). The vaporized gas generated inside the heat exchange space K flows from bottom to top. At this time, since the horizontal cross-sectional area of the heat exchange space K is smaller than the vertical cross-sectional area, the average flow velocity of the vaporized gas in the heat exchange space K is faster than when the horizontal cross-sectional area is larger than the vertical cross-sectional area.

[0018] The upper space KU is a space located above the heat exchange space K and is a space where seawater Y that exchanges heat with the liquefied ammonia X is supplied from outside the vertical container 2a. The lower space KD is a space located below the heat exchange space K and is a space where seawater Y that exchanges heat with the liquefied ammonia X and is discharged outside the vertical container 2a is temporarily stored.

[0019] Further, as shown in FIG. 1, the vertical container 2a is provided with a liquefied ammonia supply port 2a1, a vaporized gas discharge port 2a2, a liquefied ammonia discharge port 2a3, a seawater supply port 2a4, and a seawater discharge port 2a5.

[0020] The liquefied ammonia supply port 2a1 is a supply port connected to the bottom of the heat exchange space K and is connected to the liquefied ammonia supply unit 3. The vaporized gas discharge port 2a2 is a discharge port connected to the upper part of the heat exchange space K and is connected to the delivery unit 5.

[0021] The liquefied ammonia discharge port 2a3 is a discharge port connected to the bottom of the heat exchange space K, similar to the liquefied ammonia supply port 2a1. For example, the liquefied ammonia discharge port 2a3 is provided at a position facing the liquefied ammonia supply port 2a1 with the heat exchange space K interposed therebetween. Such a liquefied ammonia discharge port 2a3 is connected to the retained liquefied ammonia discharge section 6.

[0022] The seawater supply port 2a4 is a supply port connected to the upper part of the upper space KU and is provided at the upper end of the vertical container 2a. This seawater supply port 2a4 is connected to the seawater supply section 4. The seawater discharge port 2a5 is a discharge port connected to the lower part of the lower space KD and is provided at the lower end of the vertical container 2a. This seawater discharge port 2a5 is connected to the drain pipe 7.

[0023] The upper partition wall 2b is a partition wall provided in the upper part inside the vertical container 2a, and separates the inside of the vertical container 2a into the heat exchange space K and the upper space KU. That is, the upper partition wall 2b is provided at the boundary between the heat exchange space K and the upper space KU.

[0024] The lower partition wall 2c is a partition wall provided in the lower part inside the vertical container 2a, and separates the inside of the vertical container 2a into the heat exchange space K and the lower space KD. That is, the lower partition wall 2c is provided at the boundary between the heat exchange space K and the lower space KD.

[0025] The heating fluid guide pipe 2d is inserted into the heat exchange space K and guides the seawater Y. As shown in FIG. 1, a plurality of heating fluid guide pipes 2d are provided. Each heating fluid guide pipe 2d has its upper end connected to the upper partition wall 2b and its lower end connected to the lower partition wall 2c. These heating fluid guide pipes 2d guide the seawater Y supplied to the upper space KU to the lower space KD.

[0026] A plurality of baffle plates 2e are provided in the heat exchange space K of the vertical container 2a. These baffle plates 2e are plate-like members whose bases are fixed to the inner wall surface of the vertical container 2a and whose tips are arranged so as to be separated from the inner wall surface of the vertical container 2a. Each baffle plate 2e is arranged such that its front and back surfaces face in the vertical direction. Note that the heating fluid guide pipe 2d penetrates each baffle plate 2e in the vertical direction.

[0027] As shown in FIG. 1, the plurality of baffle plates 2e are arranged in the vertical direction. The baffle plates 2e arranged vertically in this way have their base positions alternately changed in the left-right direction. That is, with respect to the baffle plate 2e whose left side in FIG. 1 is the base and which is fixed to the inner wall surface of the vertical container 2a, the baffle plate 2e adjacent in the vertical direction has its right side in FIG. 1 as the base and is fixed to the inner wall surface of the vertical container 2a.

[0028] Also, the lowermost baffle plate 2e is located above the liquefied ammonia supply port 2a1 and is arranged such that its base is fixed to the inner wall surface of the vertical container 2a directly above the liquefied ammonia supply port 2a1. Also, the uppermost baffle plate 2e is located below the vaporized gas discharge port 2a2 and is arranged such that its base is fixed to the inner wall surface of the vertical container 2a directly below the vaporized gas discharge port 2a2.

[0029] These baffle plates 2e meander the flow path of the vaporized gas in the heat exchange space K and narrow the cross-sectional area of the flow path of the vaporized gas. By meandering the flow path of the vaporized gas in this way with the baffle plates 2e, it becomes possible to further increase the average flow velocity of the vaporized gas.

[0030] The liquefied ammonia supply unit 3 supplies liquefied ammonia X to the heat exchange space K of the vertical container 2a. In the present embodiment, the liquefied ammonia supply unit 3 is connected to the liquefied ammonia supply port 2a1. For example, as shown in FIG. 1, the liquefied ammonia supply unit 3 includes a liquefied ammonia supply pipe 3a and a liquefied ammonia supply pump 3b.

[0031] The liquefied ammonia supply pipe 3a is, for example, a pipe connecting a storage tank T that stores liquefied ammonia X and a liquefied ammonia supply port 2a1. The liquefied ammonia supply pump 3b is installed at an intermediate part of the liquefied ammonia supply pipe 3a. The liquefied ammonia supply pump 3b pressurizes the liquefied ammonia X and discharges the pressurized liquefied ammonia X toward the liquefied ammonia supply port 2a1.

[0032] Since the liquefied ammonia X pressurized by the liquefied ammonia supply pump 3b in this way is supplied to the heat exchange space K of the vertical container 2a, the pressure in the heat exchange space K becomes higher than the atmospheric pressure. When the liquefied ammonia X pressurized is supplied to the liquefied ammonia supply section 3, the liquefied ammonia supply section 3 may be configured not to include the liquefied ammonia supply pump 3b.

[0033] The seawater supply section 4 supplies seawater Y to the upper space KU of the vertical container 2a. In the present embodiment, the seawater supply section 4 is connected to a seawater supply port 2a4. For example, as shown in FIG. 1, the seawater supply section 4 includes a seawater supply pipe 4a and a seawater supply pump 4b.

[0034] The seawater supply pipe 4a is, for example, a pipe connecting the ocean and the seawater supply port 2a4. The seawater supply pump 4b is installed at an intermediate part of the seawater supply pipe 4a. The seawater supply pump 4b pressurizes the seawater Y and discharges the pressurized seawater Y toward the seawater supply port 2a4.

[0035] Since the seawater Y pressurized by the seawater supply pump 4b in this way is supplied to the upper space KU of the vertical container 2a, the pressure in the upper space KU becomes higher than that in the lower space KD. For this reason, the seawater Y supplied to the upper space KU flows toward the lower space KD through the heating fluid guide pipe 2d. When the pressurized seawater Y is supplied to the seawater supply section 4, the seawater supply section 4 may be configured not to include the seawater supply pump 4b.

[0036] The delivery unit 5 delivers the vaporized gas to the outside. In the present embodiment, the delivery unit 5 is connected to the vaporized gas discharge port 2a2. For example, as shown in FIG. 1, the delivery unit 5 includes a delivery pipe 5a and a superheater 5b.

[0037] The delivery pipe 5a is a pipe that connects the delivery destination and the vaporized gas discharge port 2a2. The superheater 5b is provided at an intermediate portion of the delivery pipe 5a and vaporizes the mist contained in the vaporized gas by superheating the vaporized gas. By superheating the vaporized gas with such a superheater 5b, the vaporized gas from which the mist has been removed can be supplied to the supply destination.

[0038] The accumulated liquefied ammonia discharge unit 6 can discharge the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a from the vertical container 2a by using the differential pressure between the heat exchange space K of the vertical container 2a and the discharge destination. In the present embodiment, the discharge destination where the accumulated liquefied ammonia discharge unit 6 discharges the liquefied ammonia X is the storage tank T. The storage tank T stores the liquefied ammonia X in a cooled state, but the internal pressure is close to the atmospheric pressure. On the other hand, as described above, the heat exchange space K of the vertical container 2a is supplied with the pressurized liquefied ammonia X, so the internal pressure is higher than the atmospheric pressure. The accumulated liquefied ammonia discharge unit 6 discharges the liquefied ammonia X from the heat exchange space K to the storage tank T by using such a differential pressure between the storage tank T and the heat exchange space K.

[0039] In the present embodiment, as shown in FIG. 1, the accumulated liquefied ammonia discharge unit 6 includes a discharge pipe 6a, an on-off valve 6b, a liquid level detection unit 6c, and a valve control unit 6d. The discharge pipe 6a is a pipe that connects the storage tank T and the liquefied ammonia discharge port 2a3. This discharge pipe 6a is connected to the bottom of the heat exchange space K of the vertical container 2a via the liquefied ammonia discharge port 2a3. When the liquefied ammonia X accumulates at the bottom of the heat exchange space K and the discharge pipe 6a is open, the liquefied ammonia X flows through the discharge pipe 6a to the storage tank T.

[0040] The on-off valve 6b is installed at an intermediate part of the discharge pipe 6a. The on-off valve 6b can change the opening and closing state of the discharge pipe 6a under the control of the valve control unit 6d. The liquid level detection unit 6c is a sensor that detects the liquid level of the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a. The liquid level detection unit 6c is not particularly limited, but for example, a differential pressure type level sensor can be used.

[0041] The valve control unit 6d is connected to the liquid level detection unit 6c and the on-off valve 6b. The valve control unit 6d controls the on-off valve 6b based on the liquid level detected by the liquid level detection unit 6c. Specifically, when the liquid level of the liquefied ammonia X in the heat exchange space K rises and exceeds a predetermined open liquid level, the valve control unit 6d controls the on-off valve 6b so that the discharge pipe 6a is opened. Also, when the liquid level of the liquefied ammonia X in the heat exchange space K decreases and falls below a predetermined closed liquid level, the valve control unit 6d controls the on-off valve 6b so that the discharge pipe 6a is closed.

[0042] The drain pipe 7 is a pipe for discharging seawater Y from the lower space KD of the vertical container 2a to the outside of the vertical container 2a. In the present embodiment, the drain pipe 7 is connected to the seawater discharge port 2a5 and guides the seawater Y discharged from the seawater discharge port 2a5.

[0043] In such a liquefied ammonia vaporizer unit 1 of the present embodiment, for example, the liquefied ammonia X stored in the storage tank T is supplied to the heat exchange space K by the liquefied ammonia supply unit 3. On the other hand, seawater Y is supplied from the ocean to the upper space KU of the vertical container 2a by the seawater supply unit 4. Also, the seawater Y supplied to the upper space KU flows through the heating fluid guide pipe 2d and is discharged to the lower space KD.

[0044] The liquefied ammonia X supplied to the liquefied ammonia supply section 3 is vaporized by heat exchange with seawater Y flowing through the heating fluid guide pipe 2d. The vaporized gas thus generated is supplied to the destination through the delivery section 5. Here, in the present embodiment, since the horizontal cross-sectional area is smaller than the vertical cross-sectional area of the heat exchange space K, the average flow velocity of the vaporized gas is high. Therefore, the mist present in the heat exchange space K is entrained by the vaporized gas and sent to the delivery section 5. The mist sent to the delivery section 5 is vaporized in the superheater 5b and supplied to the destination.

[0045] However, for example, when the amount of vaporized gas required by the destination is less than normal, the flow rate of the liquefied ammonia X supplied by the liquefied ammonia supply section 3 in the heat exchange space K is small. Therefore, the average flow velocity of the vaporized gas in the heat exchange space K becomes slow, and it becomes difficult to discharge the mist. As a result, the liquid level of the liquefied ammonia X accumulated in the heat exchange space K may rise.

[0046] When the liquid level of the liquefied ammonia X accumulated in the heat exchange space K rises, the on-off valve 6b of the accumulated liquefied ammonia discharge section 6 is opened, and the accumulated liquefied ammonia X is discharged to the storage tank T through the discharge pipe 6a. When the liquid level of the liquefied ammonia X accumulated in the heat exchange space K drops accordingly, the on-off valve 6b is closed.

[0047] The liquefied ammonia vaporizer unit 1 of the present embodiment as described above vaporizes liquefied ammonia X. Further, the liquefied ammonia vaporizer unit 1 of the present embodiment includes a vertical container 2a, a liquefied ammonia supply unit 3, a heating fluid guide pipe 2d, a seawater supply unit 4, a superheater 5b, and a stagnant liquefied ammonia discharge unit 6. Further, the vertical container 2a has a smaller horizontal cross-sectional area than the vertical cross-sectional area of the heat exchange space K to which the liquefied ammonia X is supplied. The liquefied ammonia supply unit 3 supplies the liquefied ammonia X to the heat exchange space K of the vertical container 2a. The heating fluid guide pipe 2d is inserted into the heat exchange space K of the vertical container 2a. The seawater supply unit 4 supplies seawater Y to the heating fluid guide pipe 2d. The superheater 5b superheats the vaporized gas discharged from the vertical container 2a. The stagnant liquefied ammonia discharge unit 6 discharges the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a from the vertical container 2a using the differential pressure between the heat exchange space K of the vertical container 2a and the discharge destination.

[0048] In the liquefied ammonia vaporizer unit 1 of the present embodiment, the vertical container 2a has a smaller horizontal cross-sectional area than the vertical cross-sectional area of the heat exchange space K. Therefore, when the vaporized gas vaporized in the heat exchange space K of the vertical container 2a rises, the flow passage area is smaller than that of a horizontally long container, and the average flow velocity of the vaporized gas increases. For this reason, the mist-like liquefied ammonia X in the heat exchange space K can be entrained by the vaporized gas and discharged outside the vertical container 2a, and can be vaporized by the superheater 5b. Therefore, according to the liquefied ammonia vaporizer unit 1 of the present embodiment, the amount of liquefied ammonia X accumulated inside the container (vertical container 2a) can be reduced, and the rise of the liquid level of the liquefied ammonia X accumulated in the heat exchange space K can be suppressed.

[0049] Further, in the liquefied ammonia vaporizer unit 1 of the present embodiment, the stagnant liquefied ammonia discharge unit 6 discharges the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a from the vertical container 2a using the differential pressure between the heat exchange space K of the vertical container 2a and the discharge destination. For this reason, the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a can be discharged from the vertical container 2a without using a pump.

[0050] Therefore, according to the liquefied ammonia vaporizer unit 1 of the present embodiment, when vaporizing the liquefied ammonia X, it is possible to suppress the rise of the liquid level of the liquefied ammonia X accumulated at the lower part of the container, and even when the liquid level rises, it is possible to discharge the liquefied ammonia X inside the vertical container 2a without using a pump.

[0051] Further, the liquefied ammonia vaporizer unit 1 of the present embodiment includes a plurality of baffle plates 2e. These baffle plates 2e are provided in the heat exchange space K of the vertical container 2a and cause the flow path of the vaporized gas to meander.

[0052] According to the liquefied ammonia vaporizer unit 1 of the present embodiment configured as described above, the flow path of the vaporized gas meanders in the heat exchange space K by the baffle plates 2e, and the cross-sectional area of the flow path of the vaporized gas is narrowed. By meandering the flow path of the vaporized gas with the baffle plates 2e in this way, it becomes possible to further increase the average flow velocity of the vaporized gas. Therefore, according to the liquefied ammonia vaporizer unit 1 of the present embodiment, it is possible to further increase the average flow velocity of the vaporized gas, entrain more mist-like liquefied ammonia X in the vaporized gas, and discharge it to the outside of the vertical container 2a.

[0053] In addition, in the liquefied ammonia vaporizer unit 1 of the present embodiment, the accumulated liquefied ammonia discharge section 6 includes a liquid level detection section 6c. The liquid level detection section 6c detects the liquid level of the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a.

[0054] According to the liquefied ammonia vaporizer unit 1 of the present embodiment configured as described above, it is possible to determine whether or not to discharge the liquefied ammonia X at the accumulated liquefied ammonia discharge section 6 according to the amount of the liquefied ammonia X accumulated in the heat exchange space K. However, it may be determined whether or not to discharge the liquefied ammonia X at the accumulated liquefied ammonia discharge section 6 according to time or the operation mode without providing the liquid level detection section 6c.

[0055] Further, in the liquefied ammonia vaporizer unit 1 of the present embodiment, the stagnant liquefied ammonia discharge section 6 includes a discharge pipe 6a, an on-off valve 6b, and a valve control section 6d. The discharge pipe 6a is connected to the bottom of the heat exchange space K of the vertical container 2a. The on-off valve 6b is installed at an intermediate portion of the discharge pipe 6a. The valve control section 6d controls the on-off valve 6b based on the detection result of the liquid level detection section 6c.

[0056] According to the liquefied ammonia vaporizer unit 1 of such a present embodiment, the opening and closing of the on-off valve 6b can be automatically controlled according to the detection result of the liquid level detection section 6c. Therefore, according to the liquefied ammonia vaporizer unit 1 of the present embodiment, when the amount of the liquefied ammonia X accumulated in the heat exchange space K increases, the liquefied ammonia X accumulated in the heat exchange space K can be automatically discharged.

[0057] Further, in the liquefied ammonia vaporizer unit 1 of the present embodiment, the discharge destination of the liquefied ammonia X of the stagnant liquefied ammonia discharge section 6 is a storage tank T for storing the liquefied ammonia X.

[0058] According to the liquefied ammonia vaporizer unit 1 of such a present embodiment, the liquefied ammonia X accumulated in the heat exchange space K can be stored again in the storage tank T. For this reason, the liquefied ammonia X accumulated in the heat exchange space K can be effectively utilized.

[0059] (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.

[0060] FIG. 2 is a schematic configuration diagram of the liquefied ammonia vaporizer unit 1A of the present embodiment. In FIG. 2, the baffle plate 2e, the liquefied ammonia supply section 3, the delivery section 5, and the stagnant liquefied ammonia discharge section 6 are omitted. As shown in this figure, in the liquefied ammonia vaporizer unit 1A of the present embodiment, a plurality of heating fluid guide pipes 2d are inserted into the heat exchange space K in the horizontal direction.

[0061] For example, as shown in FIG. 2, the inlet end of each heating fluid guide pipe 2d may be connected to the supply header pipe 2f. In such a case, the seawater supply section 4 distributes and supplies seawater Y to each heating fluid guide pipe 2d via the supply header pipe 2f.

[0062] Also, the outlet end of each heating fluid guide pipe 2d may be connected to the discharge header pipe 2g. In such a case, the drain pipe 7 receives the seawater Y discharged from each heating fluid guide pipe 2d via the discharge header pipe 2g.

[0063] Also in the liquefied ammonia vaporizer unit 1A of this embodiment having such a configuration, the vertical container 2a has a horizontal cross-sectional area smaller than the vertical cross-sectional area of the heat exchange space K. Therefore, it is possible to increase the average flow velocity of the vaporized gas and suppress the rise in the liquid level of the liquefied ammonia X accumulated in the heat exchange space K. Also in the liquefied ammonia vaporizer unit 1A of this embodiment, using the differential pressure between the heat exchange space K of the vertical container 2a and the discharge destination, the liquefied ammonia X accumulated in the heat exchange space K of the vertical container 2a can be discharged from the vertical container 2a without using a pump.

[0064] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. However, it goes without saying that the present invention is not limited to the above embodiments. The various shapes and combinations 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.

[0065] For example, in the above embodiment, an example in which the liquefied ammonia X discharged from the vertical container 2a by the retained liquefied ammonia discharge section 6 is supplied to the storage tank T has been described. However, the present invention is not limited to this. For example, a configuration in which the liquefied ammonia X discharged from the vertical container 2a is supplied to a dedicated tank can also be adopted. Also, the liquefied ammonia X discharged from the vertical container 2a can be supplied to a decontamination facility such as a flare stack.

[0066] Incidentally, the above-described embodiment can also be described as follows in the appended claims, for example.

[0067] (Appended Claim 1) A liquefied gas vaporizer unit for vaporizing liquefied gas, a vertical container having a horizontal cross-sectional area smaller than the vertical cross-sectional area of the internal space to which the liquefied gas is supplied, a liquefied gas supply unit for supplying the liquefied gas to the internal space of the vertical container, a heating fluid guide pipe inserted into the internal space of the vertical container, a heating fluid supply unit for supplying heating fluid to the heating fluid guide pipe, a superheater for superheating the vaporized gas discharged from the vertical container, and a stagnant liquefied gas discharge unit for discharging the liquefied gas accumulated in the internal space of the vertical container from the vertical container using the differential pressure between the internal space of the vertical container and the discharge destination. A liquefied gas vaporizer unit characterized by comprising the above.

[0068] (Appended Claim 2) The liquefied gas vaporizer unit according to Appended Claim 1, further comprising a plurality of baffle plates provided in the internal space of the vertical container and causing the flow path of the vaporized gas to meander.

[0069] (Appended Claim 3) The liquefied gas vaporizer unit according to Appended Claim 1 or 2, wherein the stagnant liquefied gas discharge unit includes a liquid level detection unit for detecting the liquid level of the liquefied gas accumulated in the internal space of the vertical container.

[0070] (Appended Claim 4) The stagnant liquefied gas discharge unit includes a discharge pipe connected to the bottom of the internal space of the vertical container, a on-off valve installed in an intermediate portion of the discharge pipe, and a valve control unit for controlling the on-off valve based on the detection result of the liquid level detection unit. The liquefied gas vaporizer unit according to Appended Claim 3, characterized by comprising the above.

[0071] (Appended Note 5) The discharge destination of the liquefied gas in the above-mentioned stagnant liquefied gas discharge section is a storage tank for storing the above-mentioned liquefied gas, and the liquefied gas vaporizer unit according to any one of appended notes 1 to 4, characterized in that.

Explanation of Signs

[0072] 1... Liquid ammonia vaporizer unit (liquefied gas vaporizer unit), 1A... Liquid ammonia vaporizer unit (liquefied gas vaporizer unit), 2... Vaporizer main body, 2a... Vertical container, 2d... Heating fluid guide pipe, 2e... Baffle plate, 3... Liquid ammonia supply section (liquefied gas supply section), 4... Seawater supply section (heating fluid supply section), 5... Delivery section, 5b... Superheater, 6... Stagnant liquid ammonia discharge section, 6a... Discharge pipe, 6b... On-off valve, 6c... Liquid level detection section, 6d... Valve control section, 7... Drain pipe, K... Heat exchange space (internal space), T... Storage tank (discharge destination), X... Liquid ammonia (liquefied gas), Y... Seawater (heating fluid)

Claims

1. A liquefied gas vaporizer unit for vaporizing liquefied gas, comprising: A vertical container having a horizontal cross-sectional area smaller than the vertical cross-sectional area of the internal space to which the liquefied gas is supplied; A liquefied gas supply unit for supplying the liquefied gas to the internal space of the vertical container; A heating fluid guiding pipe inserted into the internal space of the vertical container; A heating fluid supply unit for supplying a heating fluid to the heating fluid guiding pipe; A superheater for superheating the vaporized gas discharged from the vertical container; A stagnant liquefied gas discharge unit for discharging the liquefied gas accumulated in the internal space of the vertical container from the vertical container using the differential pressure between the internal space of the vertical container and the discharge destination. A liquefied gas vaporizer unit characterized by comprising the above.

2. The liquefied gas vaporizer unit according to Claim 1, further comprising a plurality of baffle plates provided in the internal space of the vertical container and causing the flow path of the vaporized gas to meander.

3. The liquefied gas vaporizer unit according to Claim 1 or 2, wherein the stagnant liquefied gas discharge unit comprises a liquid level detection unit for detecting the liquid level of the liquefied gas accumulated in the internal space of the vertical container.

4. The stagnant liquefied gas discharge unit A discharge pipe connected to the bottom of the internal space of the vertical container; An on-off valve installed in an intermediate portion of the discharge pipe; A valve control unit for controlling the on-off valve based on the detection result of the liquid level detection unit. The liquefied gas vaporizer unit according to Claim 3, characterized by comprising the above.

5. The liquefied gas vaporizer unit according to Claim 1 or 2, wherein the discharge destination of the liquefied gas of the stagnant liquefied gas discharge unit is a storage tank for storing the liquefied gas.

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