KR102084549B1 - Gas vaporizer - Google Patents

Abstract

A plurality of panels each having a plurality of heat transfer tubes and arranged intermittently, a plurality of troughs for supplying a heat source medium to the heat transfer tubes of each panel, a heat source medium supply unit for supplying a heat source medium to each trough, A receiving part receiving the heat source medium from below each panel, and a bypass flow path for guiding a part of the heat source medium from the heat source medium supply part to the receiving part without passing through each heat pipe, and the bypass flow path is spaced apart from each heat pipe. It has a shape extending from the heat source medium supply portion toward the receiving portion while passing through.

Description

Gas vaporizer {GAS VAPORIZER}

The present invention relates to a gas vaporizer.

Background Art Conventionally, a gas vaporizer (ORV) for vaporizing low temperature liquefied gas such as liquefied natural gas (LNG) using a heat source medium such as seawater is known. For example, Japanese Patent Laid-Open No. 2010-53932 (hereinafter referred to as "Patent Document 1") includes a plurality of panels, an LNG manifold for supplying liquefied natural gas (LNG) to each panel, and a plurality of A gas vaporizer including a trough, a seawater manifold for supplying seawater as a heat source medium, and a plurality of branch supply pipes connecting the seawater manifold and each trough is disclosed.

Each panel has a plurality of heat transfer tubes arranged along a specific direction. Each heat transfer tube heats LNG by heat-exchanging the LNG which flows in the said heat exchanger tube, and the seawater which flows along the outer surface of the said heat exchanger tube. The plurality of panels are arranged so as to be intermittently arranged along the arrangement direction orthogonal to the specific direction. Each trough is arrange | positioned in the position which sandwiches each panel from both sides of the said arrangement direction. The seawater manifold supplies seawater (heat source medium) to each branch supply pipe. Each branch supply pipe supplies the seawater supplied from the seawater manifold to the trough. The seawater overflowed from the trough flows down along the outer surface of each heat pipe of the panel, and is received at a receiving portion provided below each panel to form a seawater pond.

In such a gas vaporizer, it is sometimes required to make the temperature difference between the temperature of the seawater supplied to a seawater manifold and the temperature of the seawater discharged | emitted from an accommodating part below a prescribed value. For this reason, in patent document 1, the temporary retention means (terminal | pipe) which temporarily stays the seawater overflowed from the outermost trough is provided in the outer side of the outermost trough provided in the outermost direction of the said arrangement direction among several troughs. The seawater overflowed from the temporary retention means directly reaches the receiving portion without passing through the heat transfer pipe. That is, in patent document 1, since the temporary retention means is provided outside the outermost trough, it is suppressed that the said temperature difference becomes more than the said prescribed value.

In the gas vaporizer described in Patent Document 1, since the temporary retention means is provided on the outermost side of the outermost trough provided in the outermost direction of the plurality of panels, the enlargement of the vaporizer in the array direction cannot be avoided. . In addition, this problem can occur similarly when a medium other than seawater (hot water or the like) is used as the heat source medium.

An object of the present invention is to provide a gas vaporizer capable of setting a temperature difference of a heat source medium to a prescribed value or less, while avoiding the enlargement of dimensions in the arrangement direction of a plurality of panels.

A gas vaporizer according to one aspect of the present invention is a gas vaporizer for vaporizing the low temperature liquefied gas by heating the low temperature liquefied gas with a heat source medium, each having a plurality of heat transfer tubes arranged along a specific direction, A plurality of panels intermittently arranged along the crossing direction, a plurality of troughs intermittently arranged along the arrangement direction in which the plurality of panels are arranged, and a plurality of troughs for supplying the heat source medium to the heat transfer tubes of each panel, and to each trough A heat source medium supply part for supplying the heat source medium, a receiving part receiving the heat source medium from below each panel, and a bypass flow passage for guiding a part of the heat source medium from the heat source medium supply part to the receiving part without passing through each heat pipe. Each heat exchanger tube includes a low temperature liquefied gas flowing in the heat transfer tube and the outside of the heat transfer tube. By heat exchange the heat source medium flows through the passes through the position spaced the by-pass flow path for heating the low-temperature liquefied gas, and is, from the respective heat transfer tubes has a shape extending toward the said housing from the heat source medium supply.

1 is a perspective view of a gas vaporizer according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of the configuration of the gas vaporizer shown in FIG. 1.
FIG. 3 is a schematic side view of the gas vaporizer shown in FIG. 1.
FIG. 4 is a view seen from line IV-IV of FIG. 3.
5 is a schematic side view of a gas vaporizer according to a second embodiment of the present invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.

(1st embodiment)

The gas vaporizer of 1st Embodiment of this invention is demonstrated, referring FIGS.

The gas vaporizer vaporizes the low temperature liquefied gas by heating the low temperature liquefied gas with a heat source medium. In this embodiment, liquefied natural gas (LNG) is used as the low temperature liquefied gas, and seawater is used as the heat source medium. That is, a gas vaporizer is what is called an open rack vaporizer (ORV) which vaporizes LNG by heat-exchanging LNG and seawater.

As shown in FIG. 1, the gas vaporizer includes a plurality of panels 10, an installation chamber 30, a plurality of troughs 40, a heat source medium supply unit 50, and a bypass flow path 60. Equipped.

Each panel 10 vaporizes LNG by heat-exchanging LNG and seawater. Specifically, each panel 10 has a plurality of heat transfer tubes 12 arranged in a specific direction, a lower header 14, and an upper header 16. The plurality of panels 10 are arranged to be intermittently arranged along a direction orthogonal to the specific direction. Moreover, the groove | channel C for an inspector walking is provided in the both sides of each panel 10. As shown in FIG. The bores C have a shape extending along the specific direction at positions spaced apart from the panels 10.

Each heat pipe 12 heats LNG by heat-exchanging the LNG which flows in the heat pipe 12 and the seawater which flows along the outer surface of the heat pipe 12.

The lower header 14 is connected to the lower end part of each heat exchanger tube 12 so that LNG can be supplied from below in each heat exchanger tube 12. An LNG supply manifold 20 for supplying LNG to the lower header 14 is connected to one end of each lower header 14. LNG is supplied to the LNG supply manifold 20 through the LNG supply part 22.

The upper header 16 is connected to the upper end part of each heat exchanger tube 12 so that the natural gas NG which flowed out from the upper part of each heat exchanger tube 12 can be joined. One end of each upper header 16 is connected to an NG confluence manifold 24 for joining the NG flowing out of the upper header 16. The NG joined in the NG confluence manifold 24 is recovered through the NG recovery unit 26.

The installation chamber 30 has a shape surrounding each panel 10. Specifically, the installation chamber 30 includes a side wall 32 covering the periphery of each panel 10, an accommodation portion receiving sea water from below the panel 10 while closing the lower side of the side wall 32 ( 34). In addition, the LNG supply manifold 20 and the NG confluence manifold 24 are arrange | positioned outside the side wall 32. As shown in FIG.

Each trough 40 supplies seawater to the heat exchanger tube 12 of each panel 10. Each trough 40 is intermittently arranged along the arrangement direction in which the plurality of panels 10 are arranged. In this embodiment, each trough 40 is arrange | positioned in the position which sandwiches each panel 10 from both sides of the said arrangement direction. As shown in FIG. 1, FIG. 3, and FIG. 4, each trough 40 is arrange | positioned in the position adjacent to the upper part of each heat exchanger tube 12. As shown in FIG. Each trough 40 is formed in the box shape which opens upward. That is, the seawater which overflowed from the opening of the upper part of each trough 40 flows down along the outer surface of each heat pipe 12. The seawater flowing down along the outer surface of each heat pipe 12 is received by the receiving portion 34 and then discharged from the discharge line L2 through a discharge port (not shown) formed in the receiving portion 34.

The heat source medium supply part 50 supplies a heat source medium to each trough 40. Specifically, the heat source medium supply unit 50 includes a plurality of distribution headers 52 for distributing seawater to each trough 40, and a heat source medium manifold 54 for supplying a heat source medium to each distribution header 52. Have In the present embodiment, since seawater is used as the heat source medium, the heat source medium supply unit 50 is referred to as the seawater supply unit 50, and the heat source medium manifold 54 is referred to as the seawater manifold 54.

As shown in FIG. 1 and FIG. 3, each distribution header 52 is connected to the lower part of each trough 40. Specifically, each distribution header 52 has a horizontal part 52a which extends substantially horizontally, and the connection part 52b which connects the horizontal part 52a and the lower part of the trough 40. As shown in FIG. As shown in FIG. 1, the upstream part of each distribution header 52 is arrange | positioned outside the side wall 32. As shown in FIG. Each distribution header 52 is provided with the opening-closing valve V1 which can adjust an opening degree.

The seawater manifold 54 is connected to the upstream end of each distribution header 52. The seawater manifold 54 is disposed outside the side wall 32. The seawater manifold 54 is disposed in a posture in which the central axis of the seawater manifold 54 is substantially horizontal. Seawater is supplied to the seawater manifold 54 from the seawater line L1 via the seawater introduction section 56 provided in the seawater manifold 54.

The bypass flow path 60 is a flow path for directing seawater from the seawater supply unit 50 directly to the accommodation portion 34 without passing through the heat transfer tubes 12. The bypass flow path 60 has a shape extending from the seawater supply part 50 toward the accommodating part 34 while passing through positions spaced apart from the heat transfer tubes 12. In addition, "the position spaced apart from each heat exchanger tube 12" means that the bypass flow path 60 is a heat transfer tube (A) so that the heat exchange of LNG which flows in the heat transfer tube 12 and the seawater which flows in the bypass flow path 60 is not performed. Means a position spaced apart from 12). In the present embodiment, the bypass flow path 60 has a shape extending from the seawater manifold 54 toward the housing portion 34 while penetrating the side wall 32. The bypass flow path 60 has a first bypass pipe 61 and a second bypass pipe 62 extending from the different portions of the seawater manifold 54 toward the accommodation portion 34, respectively. As shown in FIG. 4, the upstream end part of each bypass pipe 61 and 62 is connected to the lower part of the seawater manifold 54. As shown in FIG. The downstream end part of each bypass pipe 61 and 62 is arrange | positioned in the vicinity of the accommodating part 34. As shown in FIG. In each bypass pipe 61 and 62, the opening / closing valve V2 which can adjust an opening degree is provided.

Next, operation | movement of the gas vaporizer demonstrated above is demonstrated.

Seawater is supplied from the seawater line L1 to the seawater manifold 54 and LNG is supplied to the LNG supply manifold 20. The seawater supplied to the seawater manifold 54 flows into each trough 40 through each distribution header 52. And the seawater overflowed from the trough 40 flows down along the outer surface of the heat exchanger tube 12 of each panel 10, is received by the accommodating part 34, and is discharged | emitted from the discharge line L2. On the other hand, LNG supplied to the LNG supply manifold 20 flows into the some heat exchanger tube 12 connected to the said lower header 14 through each lower header 14. This LNG is vaporized (it becomes NG) by heating by the seawater which flows along the outer surface of each heat exchanger tube 12. NG is recovered through each upper header 16 and NG confluence manifold 24.

Here, it is required to make the temperature difference between the temperature of the seawater supplied from the seawater line L1 to the seawater manifold 54 and the temperature of the seawater discharged to the discharge line L2 through the receiving portion 34 to be below a prescribed value. There is a case. In the present embodiment, part of the seawater supplied to the seawater manifold 54 is guided to the accommodating portion 34 without passing through the heat transfer pipes 12 through the bypass pipes 61 and 62. It is possible to omit the same temporary retention means (means arranged outside the outermost trough and temporarily storing the heat source medium). Therefore, it becomes possible to make the temperature difference of seawater below a prescribed value, avoiding the enlargement of the dimension of the arrangement direction of the some panel 10.

In addition, in this embodiment, each bypass pipe 61 and 62 has the shape extended from the seawater manifold 54 toward the accommodating part 34. In this embodiment, part of the seawater flows toward the accommodating portion 34 from the seawater manifold 54 located upstream of each distribution header 52, so that each of the seawater manifolds 54 is located downstream. As for the distribution header 52, the amount of seawater required for each trough 40 (the amount required for heat exchange in each panel 10) of the total amount of seawater supplied to the seawater manifold 54 is applied to the trough 40. It can be set to the diameter that can be supplied to. Therefore, large hardening of each distribution header 52 is suppressed.

In addition, each of the bypass pipes 61 and 62 has a shape extending from the lower portion of the seawater manifold 54 toward the housing portion 34. For this reason, since the accumulation of mud etc. in the seawater manifold 54 is suppressed, the load of the maintenance work of the said seawater manifold 54 is reduced.

(2nd embodiment)

Next, the gas vaporizer of 2nd Embodiment of this invention is demonstrated, referring FIG. In addition, in 2nd Embodiment, only a part different from 1st Embodiment is demonstrated, and description of the structure, operation | movement, and effect similar to 1st Embodiment is abbreviate | omitted.

In the present embodiment, the bypass flow path 60 is connected to the downstream end 52c of the distribution header 52. In addition, the downstream end 52c of the distribution header 52 is the connection part 52b which is located most downstream among the some connection part 52b connected to the said horizontal part 52a among the horizontal parts 52a. It points to the site located further downstream. The bypass flow path 60 has a plurality of bypass pipes 64 each of which has a shape extending from the end portion 52c on the downstream side of each distribution header 52 toward the housing portion 34. Each bypass pipe 64 has a shape extending downward toward the receiving portion 34 while passing through a position spaced apart from the bores C from the lower portion of the downstream end 52c of the distribution header 52. have. In addition, illustration of the groove | channel C is abbreviate | omitted in FIG.

In this embodiment, a part of the seawater which flowed into each distribution header 52 from the seawater manifold 54 carries out the bypass pipe 64 connected to the edge part 52c downstream of the said distribution header 52. Flow toward the receiving portion 34 through. For this reason, since generation | occurrence | production of the seawater pooling in the said downstream edge part 52c is suppressed, the load of the maintenance work of the said edge part 52c is reduced.

In addition, since the accumulation of mud and the like into the downstream end 52c is also suppressed, the load on the maintenance work of the end 52c is further reduced.

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is disclosed not by the description of the above embodiments but by the claims, and includes the meanings of the claims and equivalents and all modifications within the scope.

For example, in 1st Embodiment, each bypass pipe 61 and 62 is extended from the site | parts other than the lower part (side part, upper part, etc.) of the seawater manifold 54 toward the accommodating part 34. FIG. You may have Similarly, in 2nd Embodiment, each bypass pipe 64 may have a shape extended toward the accommodating part 34 from parts (side part, upper part, etc.) other than the lower part of each distribution header 52. FIG. .

In addition, in 1st Embodiment, the bypass flow path 60 may have a single bypass pipe, or may have three or more bypass pipes.

In addition, in 2nd Embodiment, each bypass pipe 64 penetrates into the accommodating part 34 through the side wall 32 from the site | part located in the exterior of the side wall 32 among each distribution header 52. As shown in FIG. You may have an extended shape. In addition, the bypass flow path 60 may have at least one bypass pipe 64.

Here, the above embodiment will be described schematically.

The gas vaporizer of the above embodiment is a gas vaporizer which vaporizes the low temperature liquefied gas by heating the low temperature liquefied gas with a heat source medium, each having a plurality of heat transfer tubes arranged along a specific direction and intersecting the specific direction. A plurality of panels intermittently arranged along the side, a plurality of troughs intermittently arranged along the arrangement direction in which the plurality of panels are arranged, for supplying the heat source medium to the heat transfer tubes of each panel, and the heat source medium in each trough. A heat source medium supply unit for supplying a heat source, an accommodating unit receiving the heat source medium under each panel, and a bypass flow passage for guiding a part of the heat source medium from the heat source medium supply unit to the accommodating unit without passing through each heat pipe. The heat transfer tubes are provided with a low temperature liquefied gas flowing in the heat transfer tube and an outer surface of the heat transfer tube. By flowing a heat exchange medium passes through the ten won a position spaced to heat the low-temperature liquefied gas, the bypass flow path, from each of the heat transfer tube has a shape extending toward the said housing from the heat source medium supply.

In this gas vaporizer, part of the heat source medium supplied to the heat source medium supply unit is guided to the receiving unit via each of the heat transfer tubes via the bypass flow path, so that the temporary retention means as in the prior art (arranged on the outer side of the outermost trough, The means for temporarily storing the medium) can be omitted. Therefore, it becomes possible to make the temperature difference of a heat source medium below a specified value, avoiding enlargement of the dimension of the arrangement direction of a some panel. In addition, "a position spaced apart from each heat exchanger tube" means the position where the bypass flow path is spaced apart from the heat exchanger tube so that heat exchange of the low temperature liquefied gas which flows in the heat exchanger tube and the heat source medium which flows in a bypass flow path is not performed.

In this case, the sea water supply unit has a plurality of distribution headers for distributing the heat source medium to each trough, and a heat source medium manifold for supplying the heat source medium to each distribution header, wherein the bypass flow path is the heat source. It may have a shape extending from the media manifold toward the receiving portion.

In this embodiment, part of the heat source medium flows from the seawater manifold located upstream of each distribution header toward the receiving portion, so that each distribution header located downstream of the heat source medium manifold is supplied to the heat source medium manifold. The amount of heat source medium required for each trough (the amount required for heat exchange in each panel) of the total amount of the heat source medium thus obtained can be set to a diameter that can be supplied to the trough. Therefore, large hardening of each distribution header is suppressed.

In this case, the bypass flow passage preferably has a shape extending from the lower portion of the heat source medium manifold toward the accommodation portion.

In this way, since deposition of mud and the like into the heat source medium manifold is suppressed, the load on the maintenance work of the heat source medium manifold is reduced.

Alternatively, the seawater supply unit has a plurality of distribution headers for distributing the heat source medium to each trough, and a heat source medium manifold for supplying the heat source medium to each distribution header, wherein the bypass flow path is downstream of the distribution header. You may have a shape extended toward the said accommodating part from the side edge part.

In this aspect, since the generation of the heat source medium pooling at the downstream end of the distribution header is suppressed, the load on the maintenance work at the downstream end is reduced.

In this case, the bypass flow passage preferably has a shape extending from the lower portion of the downstream end of the distribution header toward the accommodation portion.

In this case, since deposition of mud and the like into the downstream end of the distribution header is suppressed, the load on the maintenance work of the downstream end is further reduced.

Claims (5)

It is a gas vaporizer which vaporizes the said low temperature liquefied gas by heating the low temperature liquefied gas with a heat source medium,
A plurality of panels each having a plurality of heat pipes arranged along a specific direction and intermittently arranged along a direction crossing the specific direction;
A plurality of troughs intermittently arranged along an arrangement direction in which the plurality of panels are arranged, and for supplying the heat source medium to the heat transfer tubes of each panel;
A heat source medium supply unit for supplying the heat source medium to each trough,
A receiving portion receiving the heat source medium under each panel;
A bypass flow path for guiding a portion of the heat source medium from the heat source medium supply portion to the accommodation portion without passing through each heat pipe;
Each heat transfer tube heats the said low temperature liquefied gas by heat-exchanging the low temperature liquefied gas which flows in the said heat transfer tube, and the heat source medium which flows along the outer surface of the said heat transfer tube,
And the bypass flow passage has a shape extending from the heat source medium supply part toward the receiving part while passing through a position spaced from each heat transfer pipe. The method of claim 1, wherein the heat source medium supply unit,
A plurality of distribution headers for distributing the heat source medium to each trough;
A heat source medium manifold for supplying said heat source medium to each distribution header,
And the bypass flow passage has a shape extending from the heat source medium manifold toward the accommodation portion. The gas vaporizer according to claim 2, wherein the bypass flow passage has a shape extending from a lower portion of the heat source medium manifold toward the accommodation portion. The method of claim 1, wherein the heat source medium supply unit,
A plurality of distribution headers for distributing the heat source medium to each trough;
A heat source medium manifold for supplying said heat source medium to each distribution header,
And the bypass flow passage has a shape extending from the end portion downstream of the distribution header toward the accommodation portion. The gas vaporizer according to claim 4, wherein the bypass flow passage has a shape extending from a lower portion of an end portion downstream of the distribution header toward the accommodation portion.

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