KR101447871B1 - Gas passage way structure - Google Patents

Abstract

A gas passage structure is disclosed. A gas passage structure provided in a tank for storing cryogenic liquid cargo, comprising: a main pipe formed in a vertical direction; and a partition wall separating the main pipe into a plurality of pipes, wherein one side of the tank is vertically penetrated ≪ / RTI > And a pressure control valve connected to the pipeline structure so as to adjust the pressure inside the tank. The partition wall is formed in the main pipe so as to extend vertically in the main pipe so as to divide the upper portion of the main pipe into the first pipe and the second pipe , The gas in the tank is diverted from the main pipe to the first pipe and the second pipe, and is discharged to the outside of the tank.

Description

Gas path structure {GAS PASSAGE WAY STRUCTURE}

The present invention relates to a gas passage structure provided in a tank for storing cryogenic liquid contents.

Liquefied natural gas (LNG) generally refers to a colorless transparent cryogenic liquid with a volume of methane-based natural gas cooled to -163 ° C, reducing its volume by one-sixth.

As such liquefied natural gas is used as an energy resource, an effective transportation method capable of mass transportation from the production base to the demand area has been examined in order to utilize this gas as energy. As a part of this effort, a large amount of liquefied natural gas A liquefied natural gas carrier that can be transported by sea has been developed.

At this time, the liquefied natural gas carrier should be equipped with a storage tank for safely storing and storing liquefied natural gas liquefied at a cryogenic temperature.

In the ceiling portion of the storage tank, not only a liquid cargo passage for unloading the liquid cargo but also an evaporation gas discharge passage for discharging the evaporation gas of the liquid cargo stored in the tank, a gas discharge passage for controlling the pressure in the tank, Gas flow paths for inspection and maintenance, and spray piping for cooling the storage tank.

At this time, in order to install various kinds of gas passages and pipes for allowing gas to flow in and out of the storage tank, it is necessary to allocate a lot of space in the upper part of the storage tank, and it is difficult to perform installation work and maintenance due to the complicated piping device And it may cause problems such as insulation and sealing of the tank.

Further, due to sloshing phenomenon of the liquid cargo stored in the storage tank during the operation of the liquefied natural gas carrier, there is a high possibility that members and pipes for the gas passages installed on the tank are damaged.
[Prior Art Literature]
Patent Document 1: United States Patent No. 3728092 (April 17, 1973)

An embodiment of the present invention is to provide a gas passage structure that is simple in structure because the piping for discharging the evaporation gas and the pressure control pipe are formed in a single channel by way of the partition walls.

According to an aspect of the present invention, there is provided a gas passage structure provided in a tank for storing cryogenic liquid cargo, comprising: a main pipe formed in a vertical direction; and a partition wall separating the main pipe into a plurality of pipes, A pipe structure disposed vertically through the ceiling of the ceiling; And a pressure control valve connected to the pipeline structure so as to adjust a pressure inside the tank, wherein the partition wall separates the upper portion of the main pipeline from the upper portion and the lower portion of the main pipeline And the gas inside the tank is branched from the main channel to the first channel and the second channel to be discharged to the outside of the tank.

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At this time, the pressure control valve may be positioned on the upper portion of the pipeline structure.

The pressure control valve may be connected to at least one of the first conduit and the second conduit.

According to an embodiment of the present invention, the gas passage structure can be easily configured by forming the piping for discharging the evaporation gas and the pressure control piping from one pipeline through the partition wall.

1 is a perspective view of a tank including a gas passage structure according to an embodiment of the present invention.
2 is a cross-sectional view of a gas passage structure according to an embodiment of the present invention.
3 is an enlarged view of a portion 'III' in FIG.
4 is a perspective view of a spray piping in a gas path structure according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

The sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings.

1 is a perspective view of a tank 1 including a gas passage structure 10 according to an embodiment of the present invention.

Referring to FIG. 1, a gas passage structure 10 according to an embodiment of the present invention is provided at one side of a ceiling of a tank 10 for storing cryogenic liquid.

At this time, according to an embodiment of the present invention, the gas passage structure 10 may be installed in the center of the ceiling portion.

However, when installed in the center of the ceiling, the gas inside the tank 1 will mostly exist in the upper part of the space occupied by the liquid cargo, that is, in the ceiling portion of the tank 1, When the gas inside the gas passage structure 10 flows in and out through the gas passage structure 10, it is possible to flow the gas more efficiently than other positions in the middle position.

Meanwhile, the pressure control valve 700 of the gas passage structure 10 according to an embodiment of the present invention may be located outside the tank 1.

This is so that the gas inside the tank 1 can be discharged to the outside of the tank 1 through the pressure control valve 700.

Details of the pressure control valve 700 will be described later.

On the other hand, a liquid passage structure 20 for unloading liquid cargo can be installed on the upper side of the tank 10.

Hereinafter, the configuration of the gas passage structure 10 according to an embodiment of the present invention will be described in detail with reference to the drawings.

2 is a cross-sectional view of a gas passage structure 10 in accordance with an embodiment of the present invention. 3 is an enlarged view of a portion 'III' in FIG. 4 is a perspective view of spray piping 500 in a gas path structure 10 in accordance with an embodiment of the present invention.

2, a gas passage structure 10 according to an embodiment of the present invention may include a line structure 100, a pressure control valve 700, a pressure measurement line 300, and a spray line 500 have.

The pipeline structure 100 has a structure in which the gas inside the tank 1 is discharged to the outside of the tank 1 or the gas outside the tank 1 flows into the inside of the tank 1, Is a passage for passing.

2, the outer surface of the channel structure 100 is surrounded by the insulating material 30, and the outer surface of the channel structure 100 is surrounded by the insulating material 30, Can be.

Referring to FIG. 1, the channel structure 100 may have a cylindrical shape, but is not limited thereto. The channel structure 100 may be formed in various shapes as long as it has one or more pipe structures capable of flowing gas.

Meanwhile, according to one embodiment of the present invention, the duct structure 100 is installed through one side of the ceiling of the tank 1 in a vertical direction.

As a result, the gas can pass through the channel structure 100 to the inside and the outside of the tank 1.

In this case, the duct structure 100 may be formed by vertically penetrating one side of the ceiling surface of the tank 1, but the present invention is not limited thereto.

The channel structure 100 in the gas passage structure 10 according to an embodiment of the present invention may include a main channel 110 and a partition wall 170.

At this time, when the gas in the tank 1 flows out of the tank 1 and when the gas outside the tank 1 flows into the tank 1, Is a single pipe arranged on the inner side of the tank (1).

The partition wall 170 separates the main pipe 110 into a plurality of pipes.

2, according to one embodiment of the present invention, the pipeline structure 100 is configured such that the gas inside the tank 1 is discharged to the outside of the tank 1 through the pipeline structure 100 The first branch line 120 and the second branch line 130 are branched by the partition wall 170 in the main line 110 as a single channel.

At this time, the partition wall 170 is formed to be long in the downward direction from the upper surface of the channel structure 100, and completely separates the upper portion of the channel structure 100 into two channels.

At this time, the partition wall 170 does not divide the cross-sectional area of the main pipe 110 into two equal parts, and it does not divide the cross-sectional area of the main pipe 110 into two equal parts, and the nature of the gas inside the tank 1 and the proper The ratio can be divided into two.

However, if the separating partition wall 170 is formed to be too long downward, the partition wall 170 may be damaged when the liquid contents in the tank 1 are spouted, so that the separating partition wall 170 may be formed at an appropriate height.

When the main pipe 110 is divided into the first pipe 120 and the second pipe 130 by the partition wall 170 as described above, the structure inside the channel structure 100 can be simplified, It is possible to reduce the change of the gas velocity and the pressure according to the flow of the gas.

The channel structure 100 may include a main channel 110, a partition wall 170, a first channel 120, and a second channel 130, The structure 100 has a structure in which the gas in the tank 1 is discharged to the outside of the tank 1 through the pipeline structure 100 on the basis of the gas flow, To the first conduit 120 and the second conduit 130, which are two passages, by the first conduit 170.

According to an embodiment of the present invention, when the pressure inside the tank 1 becomes high due to the gas inside the tank 1, the first conduit 120 moves the gas inside the tank 1 into the tank 1 ) Can be used as a gas passage for discharging to the outside.

In addition, the second conduit 130 can supply various kinds of gas into or out of the tank 1 according to need, such as maintenance and inspection of the tank 1, or the liquid in the tank 1 is vaporized And can be used as a gas passage for evacuating the generated evaporative gas to the outside of the tank (1).

That is, according to the embodiment of the present invention, by constructing the two gas passages necessary for the tank 1 with only one structure, the space utilization efficiency can be increased.

However, the functions of the first conduit 120 and the second conduit 130 are not limited to the above-described roles, and may be used as gas passages that perform various functions as needed.

According to an embodiment of the present invention, the main pipeline 110 is connected to a common passage through which the gas first passes when the gas inside the tank 1 is discharged to the outside of the tank 1 through the pipeline structure 100, And corresponds to the structure of the tank 1 side end portion in the channel structure 100. [

At this time, the end of the main pipeline 110 inside the tank 1 is opened to be able to communicate with the inside of the tank 1.

The outer side of the tank 1 of the main pipeline 110 is branched to the first pipeline 120 and the second pipeline 130 and communicates with the outside of the tank 1. [

At this time, since all the gas flowing in and out of the tank 1 passes through the main pipeline 110, the main pipeline 110 has a sectional area smaller than that of the first pipeline 120 and the second pipeline 130, Becomes wider.

Accordingly, according to an embodiment of the present invention, as the gas in the tank 1 advances to the main pipe 110, a phenomenon that the flow speed is increased or the pressure is decreased can be reduced.

At this time, when the gas inside the tank 1 advances to the main pipeline 110 and the flow velocity increases, a phenomenon occurs in which the gas in the tank 1 is not discharged as a whole but only locally , There is a problem that the replacement process between the discharged gas and the gas that replenishes the spot does not proceed smoothly.

When the pressure in the tank 1 is lowered as the gas in the tank 1 advances to the main pipeline 110, the pressure control valve 700 operated by the measuring pressure through the pressure measuring pipe 300, which will be described later, A problem that can not be exercised may occur.

Therefore, the larger the cross-sectional area of the main pipe 110 is, the more preferable it may be determined in consideration of a space problem, a cost problem, a sealing problem, an insulation problem, and the like.

Meanwhile, the first channel 120 of the gas passage structure 10 according to an embodiment of the present invention may include an inlet pipe 122 and a discharge pipe 124.

At this time, the inflow conduit 122 is a portion of the main conduit 110 that branches from the main conduit 110 to the first conduit 120, and may be formed in parallel with the main conduit 110.

Referring to FIG. 2, the inlet pipe 122 may include a partitioning wall 170 and a member forming the main pipe 110.

However, the present invention is not limited thereto, and the inflow conduit 122 may be formed of a member different from the main conduit 110 if the inflow conduit 122 is branched from the main conduit 110 and formed in parallel.

According to one embodiment of the present invention, the discharge pipe 124 is configured to connect between the pipe structure 100 and the pressure control valve 700.

2, the discharge pipe 124 may be connected to a pressure control valve 700 located at the outside of the tank 1 and formed at one side of the pipeline structure 100 and protruding outwardly have.

Thus, according to an embodiment of the present invention, the process of discharging the internal gas of the tank 1 to the outside of the tank 1 through the first conduit 120 is performed such that the gas, which has passed through the inlet conduit 122, Flows to the pressure control valve 700 along the pressure control valve 124 and is discharged to the outside of the tank 1 when the pressure control valve 700 is opened.

1 and 2, the discharge pipe 124 may be formed on the upper side of the channel structure 100 and may protrude upward. As shown in FIG.

At this time, the pressure control valve 700, which will be described later, may be positioned above the channel structure 100.

Accordingly, the inflow channel 122 and the discharge channel 124 constituting the first channel 120 can be formed in a long straight line in the vertical direction, so that the structure of the channel can be simplified and the flow of the gas can be smoothly can do.

According to an embodiment of the present invention, the second conduit 130 may include an auxiliary conduit 132, a deceleration chamber 136, and an external conduit 134.

At this time, the auxiliary conduit 132 is a portion of the main conduit 110 branched from the main conduit 110 to the second conduit 130, and may be formed in parallel with the main conduit 110.

2, the inflow conduit 122 may be formed of a partitioning wall 170 and a member forming the main conduit 110. In this case, as shown in FIG.

At this time, the cross sectional area of the auxiliary pipeline 132 becomes smaller than the cross sectional area of the main pipeline 110.

Accordingly, the flow of the gas discharged from the inside of the tank 1 is accelerated through the auxiliary pipe 132 from the main pipe 110.

According to one embodiment of the present invention, the deceleration chamber 136 may be located above the auxiliary conduit 132 as a space for slowing the flow rate.

At this time, since the cross-sectional area of the deceleration chamber 136 is larger than the cross-sectional area of the auxiliary pipeline 132, the flow from the auxiliary pipeline 132 to the deceleration chamber 136 is slowed down.

As described above, the velocity of the gas flow is increased while passing through the auxiliary conduit 132 from the main conduit 110. In this case, the droplet due to the liquid cargo inside the tank 1 may be discharged together.

Accordingly, according to one embodiment of the present invention, by slowing the velocity of the gas flow discharged from the inside of the tank 1 in the deceleration chamber 136, the liquid that may be contained in the discharged gas falls downward by the gravity , It is possible to prevent the danger of being discharged together with the gas outside the tank (1).

According to one embodiment of the present invention, the external piping 134 is configured to allow the gas passing through the deceleration chamber 136 to flow out of the tank 1.

At this time, the external piping 134 may be formed at one side of the pipeline structure 100 and protrude to the outside.

On the other hand, the external piping 134 communicates with the outside of the tank 1, and the discharged gas can be connected to a necessary point. When the gas is introduced into the tank 1, the external piping 134 can be connected to the gas introduction means.

Meanwhile, according to one embodiment of the present invention, the channel structure 100 may further include a concave portion 140.

Referring to FIG. 2, the channel structure 100 may have a concave portion 140 that is structurally lower in height than the adjacent circumference. Here, the height may be a general meaning, Lt; / RTI > direction.

At this time, the concave portion 140 is formed so as to correspond to the heat shrinkage and the thermal expansion due to the gas passing through the channel structure 100 or the ultra-low temperature liquid stored in the tank 1, Lt; / RTI >

At this time, the liquid cargo stored in the tank 1 may bulge into the channel structure 100 due to various reasons, and may be buried in the concave portion 140.

In this case, there is a possibility that various problems such as damage to the pipeline structure 100 and the piping, leakage of the poured liquid to the gas passage, and the like may occur, so that the liquid should not be accumulated in the pipeline structure 100.

According to an embodiment of the present invention, a drainage passage 150 may be formed in the pipeline structure 100 so that the liquid poured into the concave portion 140 can be immediately returned to the interior of the tank 1 .

3, the drainage channel 150 may have an inlet formed at one side of the recess 140 and an outlet formed at one side of the inner side of the channel structure 100.

At this time, according to an embodiment of the present invention, the drainage passage 150 may include a bent portion 152.

At this time, the bending portion 152 is a portion where a portion of the drainage passage 150 is bent in a straight line or a curved line, and is configured to cope with thermal shrinkage and thermal expansion due to the extremely low temperature liquid inside the tank 1.

Accordingly, the drainage path 150 can flexibly cope with heat shrinkage or thermal expansion due to the cryogenic liquid inside the tank 1 or the liquid flowing in the drainage path 150.

According to an embodiment of the present invention, a net structure 154 may be provided at an outlet of the drainage passage 150.

Accordingly, even if the liquid in the tank 1 sprints into the channel structure 100 due to various reasons, the liquid is prevented from flowing backward through the discharge port of the drainage path 150 due to the increase in resistance by the network structure 154 The possibility can be reduced.

The pressure control valve 700 of the gas passage structure 10 according to the embodiment of the present invention is configured such that when the pressure inside the tank 1 becomes equal to or higher than a predetermined pressure, So as to prevent an accident such as explosion of the tank 1 caused by high pressure, thereby securing safety.

At this time, the pressure control valve 700 is located outside the tank 1 as described above, and is connected to the pipeline structure 100.

More specifically, according to an embodiment of the present invention, the pressure control valve 700 is connected to the first conduit 120, and when the pressure control valve 700 is opened by the high pressure signal, The gas in the tank 1 can be discharged through the discharge pipe 124 of the pressure control valve 700 to one side of the pressure control valve 700.

According to an embodiment of the present invention, the pressure control valve 700 may be positioned above the channel structure 100, as shown in FIGS.

This simplifies the arrangement of the pressure measurement pipe 300 to be described later and allows the gas flow from the first conduit 120 to the discharge pipe 124 to be more smooth.

In the meantime, in the gas passage structure 10 according to the embodiment of the present invention, the pressure measurement pipe 300 is a structure for measuring the pressure inside the tank 1.

At this time, the pressure measurement pipe 300 is connected to one side of the pressure control valve 700, one side of which is located inside the first conduit 120 and the other side of which is located outside the tank 1.

At this time, the pressure measurement value inside the tank 1 measured by the pressure measurement pipe 300 is transmitted to the pressure control valve 700, and can be used to operate the pressure control valve 700.

In this case, when the one side of the pressure measurement pipe 300 is positioned inside the tank 1, the pressure measurement pipe 300 may be damaged by the liquid cargo inside the tank 1, Is positioned inside the first conduit 120, not inside the tank 1. As shown in FIG.

At this time, one end of the pressure measurement pipe 300 may be disposed perpendicular to the flow direction of the gas so that the static pressure can be measured through the pressure measurement pipe 300.

Accordingly, the pressure measuring pipe 300 measures the static pressure inside the first pipe 120 where one side of the pipe is located.

This is because not only the cross sectional area of the first channel 120 is sufficiently wide but also the structure for preventing the pressure drop such as enlarging the cross sectional area of the main channel 110 inside the tank 1 is formed, And the pressure of the first conduit 120 does not vary greatly.

Meanwhile, according to an embodiment of the present invention, the first refraction portion 320 may be formed on at least a part of the pressure measurement pipe 300.

Referring to FIG. 2, the first refracting portion 320 is a portion where the pressure-specifying pipe 300 is bent a plurality of times to form a corrugated shape.

In this case, the refraction includes all curvatures bent in a curve or a straight line.

Accordingly, the pressure measurement pipe 300 according to an embodiment of the present invention can cope with heat shrinkage and thermal expansion due to gas passing through the pipeline or ultra-low temperature liquid inside the tank 1. [

In the meantime, in the gas passage structure 10 according to the embodiment of the present invention, the spray pipe 500 is a structure for allowing the cooling fluid to be injected into the tank 1 to cool the inside of the tank 1.

A tank 1 for storing a cryogenic liquid such as LNG needs to cool the inside of the tank 1 in advance in order to prevent a thermal shock before injecting the liquid cargo into the tank 1, The inside of the tank 1 can be cooled by injecting the same fluid as the cargo into the inside of the tank 1.

However, the spray pipe 500 according to an embodiment of the present invention is not limited to the above-described use.

According to an embodiment of the present invention, one side of the spray pipe 500 may be disposed inside the pipeline structure 100 through one side of the pipeline structure 100.

Thus, the cooling fluid can be supplied from the cooling fluid supply source outside the tank 1, and the cooling fluid can be injected into the tank 1. [

At this time, the spray pipe 500 may be formed in the inside of the tank 1, that is, in the vertical direction.

This is for spraying the cooling fluid in a state in which the spray pipe 500 passes through the inside of the channel structure 100 and is exposed to the inside of the tank 1.

Meanwhile, as shown in FIG. 4, the number of the spray pipes 500 may be two, but is not limited thereto and may be one or more.

Meanwhile, according to an embodiment of the present invention, the spray pipe 500 may include a second refracting portion 520 and a nozzle portion 540.

At this time, the second refracting portion 520 may be formed on at least a part of the spray pipe 500 in order to cope with thermal contraction and thermal expansion.

Referring to FIG. 4, the second refracting portion 520 is a portion where the spray pipe 500 is bent a plurality of times to form a wrinkle shape.

In this case, the refraction includes all curvatures bent in a curve or a straight line.

Accordingly, the spray pipe 500 according to an embodiment of the present invention can cope with heat shrinkage and thermal expansion due to gas flowing in the pipeline structure 100 or cryogenic liquid inside the tank 1.

According to an embodiment of the present invention, the nozzle unit 540 is configured to inject the cooling fluid flowing along the spray pipe 500 to the outside of the spray pipe 500 to cool the interior of the tank 1.

At this time, the nozzle unit 540 may include a frame 542 and an injection nozzle 544.

At this time, the frame 542 is configured to dispose the injection nozzle 544, and is formed at the end inside the tank 1 at the spray pipe 500.

2, the frame 542 may be disposed on the outer side of the duct structure 100 outside the inside of the duct structure 100, and may be located on the ceiling of the tank 1 as a whole.

At this time, the frame 542 may be formed in the form of a frame having a larger area than the cross section of the main pipe 110.

Accordingly, the whole structure of the frame 542 can be disposed on the outer side of the channel structure 100, and the jet nozzles 544 can be disposed in a wide area, so that the cooling fluid is jetted to a wider range toward the inside of the tank 1 .

Meanwhile, according to an embodiment of the present invention, the frame 542 may be formed in various rim shapes such as a circular rim shape, but not limited thereto, and a polygon including a rectangle.

Particularly, when the ceiling portion of the tank 1 provided with the gas passage structure 10 according to an embodiment of the present invention is rectangular, it may be advantageous to form the frame 542 having a quadrangular rim shape rather than a circular shape, have.

Meanwhile, the injection nozzle 544 according to an embodiment of the present invention is configured to inject a cooling fluid, and may be disposed at a predetermined distance on one side of the frame 542.

Accordingly, the cooling fluid flowing along the spray pipe 500 reaches the frame 542 and can be injected into the tank 1 through the injection nozzle 544.

At this time, the injection nozzles 544 are disposed toward the inner direction of the tank 1, and can be spaced so that the injection ranges do not overlap.

Further, the jetting direction of the jetting nozzles 544 can be configured in a zigzag manner to minimize the overlapping of the jetting ranges.

As described above, the gas passage structure 10 according to the embodiment of the present invention includes a main pipe 110, a first pipe 120 and a second pipe 130, Structure 100 and may include a pressure control valve 700, a pressure measurement line 300, and a spray line 500.

Accordingly, the gas passage structure 10 according to the embodiment of the present invention can simplify the structure of the gas passage by forming the pipe for discharging the evaporation gas and the pressure-controlling pipe into a structure branched from one pipe in the same structure Can be configured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1 tank 10 gas passage structure
20 Liquid passage structure 30 Insulation
100 conduit structure 110 main conduit
120 First piping 124 Discharge piping
130 Second piping 134 External piping
136 Deceleration chamber 140 Concave
150 multiplier 152 turn
154 mesh structure 170 partition wall
300 Pressure measurement piping 320 First refraction section
500 spray piping 520 second refraction portion
540 nozzle part 542 frame
544 injection nozzle 700 pressure control valve

Claims (5)

A gas passage structure provided in a tank for storing cryogenic liquid contents,
A main pipe line formed in a vertical direction and a partition wall separating the main pipe line into a plurality of pipelines, the pipe line structure being installed through one side of a ceiling of the tank in a vertical direction; And
And a pressure control valve connected to the channel structure so as to adjust a pressure inside the tank,
Wherein the partition wall is vertically formed in the main pipe so as to divide the upper portion of the main pipe into the first pipe and the second pipe,
Wherein the gas in the tank is branched from the main pipe to the first pipe and the second pipe to be discharged to the outside of the tank. delete delete The method according to claim 1,
Wherein the pressure control valve is located at an upper portion of the channel structure. The method according to claim 1,
Wherein the pressure control valve is connected to at least one of the first conduit and the second conduit.

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