KR101797620B1 - Apparatus of storing container for liquefied natural gas - Google Patents

Abstract

The present invention relates to a structure of a liquefied natural gas storage vessel, which can efficiently store liquefied natural gas and pressurized liquefied natural gas at a constant pressure to supply the liquefied natural gas to a consuming place, minimizes the use of a metal having excellent low- The present invention relates to a structure of a liquefied natural gas storage container having a sliding structure that is configured to reduce the size of a liquefied natural gas storage container.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquefied natural gas storage vessel,

The present invention relates to a structure of a liquefied natural gas storage vessel, which can efficiently store liquefied natural gas and pressurized liquefied natural gas at a constant pressure to supply the liquefied natural gas to a consuming place, minimizes the use of a metal having excellent low- And more particularly, to a structure of a liquefied natural gas storage container configured to reduce the size of the liquefied natural gas storage container.

In general, liquefied natural gas (LNG) is a colorless transparent cryogenic liquid which is cooled to a temperature of -162 ° C at atmospheric pressure to reduce the volume of methane (natural gas) , It is known that it is more economical for long-distance transportation because of better transportation efficiency than the gas state.

Such liquefied natural gas has been applied to large-scale and long-distance transportation in order to satisfy the economical efficiency due to the construction cost of the construction plant and carrier of the production plant. On the other hand, pipelines and CNG (Compressed Natural Gas) Is known to be economical. However, transportation using pipelines is subject to geographical restrictions, environmental problems can be caused, and CNG has a disadvantage of low transportation efficiency.

Conventional methods of distributing liquefied natural gas to consumer sites require not only high costs but also difficulty in flexibly coping with various needs of consumer sites and require a separate storage tank in a consuming place, And it took a lot of time and effort to unload the gas.

In addition, natural gas has a liquefaction point of -163 ° C at atmospheric pressure, and when the pressure is applied, the liquefaction point rises above atmospheric pressure. These characteristics can reduce processing steps such as removal of acid gas and fractionation of NGL (Natural Gas Liquid) in the liquefaction process, resulting in reduction of equipment and facility capacity, Thereby reducing the production cost of the product.

However, the conventional liquefied natural gas storage tanks provided in vessels equipped with liquefied natural gas terminals or gasification facilities are limited not only to a certain size, but also to liquefied natural gas And it is difficult to easily transport liquefied natural gas to the consumer site in accordance with the needs of various consumers.

In order to solve the above-mentioned problem, in order to store not only general liquefied natural gas but also liquefied natural gas which is pressurized to a constant pressure, a metal material having excellent low temperature characteristics is used to manufacture a container capable of withstanding cryogenic temperature and high pressure However, the wall thickness of the container is inevitably increased for this purpose, and another problem is that it is difficult to secure economical efficiency due to the use of expensive metal having excellent low-temperature characteristics.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to efficiently store liquefied natural gas, which is pressurized at a constant pressure as well as liquefied natural gas, To reduce manufacturing costs, to satisfy various needs and demands of the customer easily, and to ensure diversity in the type and size of the carriers.

According to an aspect of the present invention, there is provided a method of deforming a support structure of a liquefied natural gas storage container.

According to the present invention, not only liquefied natural gas but also liquefied natural gas pressurized at a constant pressure can be efficiently stored and supplied to a consuming area, the use of a metal excellent in low temperature characteristics can be minimized, It is possible to satisfy the demand of the user easily, and it is possible to secure diversity of the type and size of the carrying vessel.

In addition, it is designed to have the internal pressure of the inner shell and the inner pressure of the heat insulating layer have the same value to ensure the structural safety, and the outer shell is used as the steel material capable of withstanding the internal pressure, thereby reducing the use of metal excellent in low- The cost can be reduced.

In addition, it is possible to prevent concentration of thermal stress due to thermal deformation occurring in the support structure supporting the inner shell and the outer shell with a simple structure, thereby improving the durability and reducing the manufacturing cost of the support structure.

1 is a flow chart showing a method of producing pressurized liquefied natural gas according to the present invention,
2 is a view showing a pressurized liquefied natural gas production system according to the present invention,
FIG. 3 is a flow chart showing a pressurized liquefied natural gas distribution method according to the present invention,
4 is a view for explaining a pressurized liquefied natural gas distribution method according to the present invention,
5 is a side view showing a pressure vessel used in the pressurized liquefied natural gas distribution method according to the present invention,
6 is a view for explaining another example of the pressurized liquefied natural gas distribution method according to the present invention,
7 is a perspective view showing a storage tank for liquefied natural gas according to the present invention,
FIG. 8 is a perspective view showing various specifications of a storage tank for liquefied natural gas according to the present invention,
FIG. 9 is a view showing a storage tank for liquefied natural gas according to the present invention;
10 is a configuration diagram showing another example of the liquefied natural gas storage tank according to the present invention.
11 is a sectional view showing a storage vessel of liquefied natural gas according to the first embodiment of the present invention,
12 is a cross-sectional view showing another embodiment of a connecting portion formed in a storage container for liquefied natural gas according to the first embodiment of the present invention,
13 is a sectional view for explaining the operation of the storage vessel of liquefied natural gas according to the first embodiment of the present invention,
FIG. 14 is a partial cross-sectional view showing a storage vessel for liquefied natural gas according to a second embodiment of the present invention;
15 is a partial cross-sectional view showing a storage vessel of liquefied natural gas according to a third embodiment of the present invention,
16 is a cross-sectional view of a storage vessel of liquefied natural gas according to a fourth embodiment of the present invention,
17 is a sectional view taken along the line A-A 'in Fig. 16,
18 is a sectional view taken along the line B-B 'in Fig. 17,
19 is a sectional view showing a storage vessel of liquefied natural gas according to a fifth embodiment of the present invention,
20 is a sectional view showing a storage vessel of liquefied natural gas according to a sixth embodiment of the present invention,
21 is a cross-sectional view taken along line C-C 'of Fig. 20,
22 is a sectional view showing a storage vessel of liquefied natural gas according to a seventh embodiment of the present invention,
23 is a configuration diagram showing a storage vessel for liquefied natural gas according to an eighth embodiment of the present invention,
FIG. 24 is a schematic view showing a storage vessel for liquefied natural gas according to a ninth embodiment of the present invention;
FIG. 25 is a view showing a storage vessel of a liquefied natural gas according to a tenth embodiment of the present invention;
26 is a cross-sectional view illustrating a storage vessel of liquefied natural gas according to an eleventh embodiment of the present invention,
FIG. 27 is a sectional view showing another example of a connecting portion of a storage vessel of liquefied natural gas according to an eleventh embodiment of the present invention;
FIG. 28 is a cross-sectional view showing another example of the connecting portion of the storage vessel of liquefied natural gas according to the eleventh embodiment of the present invention,
FIG. 29 is a cross-sectional view showing another example of the connecting portion of the storage vessel of the liquefied natural gas according to the eleventh embodiment of the present invention,
FIG. 30 is an enlarged view of a main part of a storage vessel of liquefied natural gas according to a twelfth embodiment of the present invention,
31 is a perspective view showing a buffer part provided in a storage container for liquefied natural gas according to a twelfth embodiment of the present invention,
32 is a perspective view showing another example of a cushioning portion provided in a storage container for liquefied natural gas according to a twelfth embodiment of the present invention,
33 is a schematic view showing an apparatus for producing liquefied natural gas according to the present invention,
34 is a side view showing a floating structure having a storage tank transportation device according to the present invention,
35 is a front view showing a floating structure having a storage tank transportation device according to the present invention,
FIG. 36 is a side view for explaining the operation of the floating structure having the storage tank transportation device according to the present invention;
37 is a configuration diagram showing a high-pressure holding system of a pressurized liquefied natural gas storage vessel according to the present invention,
38 is a configuration diagram showing a separate type liquefier of a heat exchanger according to the first embodiment of the present invention,
FIG. 39 is a configuration diagram showing a separate type liquefier of a heat exchanger according to a second embodiment of the present invention;
40 is a front sectional view showing a liquefied natural gas storage vessel carrier according to the present invention,
41 is a side sectional view showing a liquefied natural gas storage vessel carrier according to the present invention,
FIG. 42 is a plan view showing the essential parts of the liquefied natural gas storage vessel carrier according to the present invention,
43 is a view showing a structure of a carbon dioxide solidification removing system according to the present invention,
44 is a view showing the operation of the carbon dioxide solidification removing system according to the present invention,
45 is a cross-sectional view illustrating a connection structure of a liquefied natural gas storage container according to the present invention,
46 is a perspective view illustrating a connection structure of a liquefied natural gas storage container according to the present invention,
47 is a cross-sectional view for explaining the operation of the connection structure of the liquefied natural gas storage container according to the present invention.
Figure 48 is a schematic illustration of a storage vessel for liquefied natural gas according to the present invention;
49 is a view schematically showing the structure of a shell internal shell of liquefied natural gas according to the present invention;
50 is a view showing various forms of the structure of the internal shell of the liquefied natural gas storage vessel according to the present invention;
51 is a view showing various forms of the structure of the internal shell of the liquefied natural gas storage vessel according to the present invention;
52 is a view schematically illustrating the structure of an internal shell of a storage vessel of liquefied natural gas according to the present invention;
53 is a schematic view of a storage vessel for liquefied natural gas according to the present invention;
54 is a view schematically showing a structure of a liquefied natural gas storage container according to the present invention;
55 to 57 are schematic views of a hinge support of a liquefied natural gas storage container according to the present invention, wherein (a) is a plan view and (b) is a side view.
58 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention;
59 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention;
Fig. 60 is an enlarged view of a portion A in Fig. 59. Fig. 60 (a) is a view when the inner shell expands, and Fig. 60 (b) is a view when the inner shell is contracted.
61 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention, wherein (a) is a view in which two lower supports are provided, and (b) is a view in cross-sectional side view.
62 schematically shows a structure of a liquefied natural gas storage container according to the present invention;
63 and Fig. 64 are top cross-sectional views schematically showing cross-sectional side views of a liquefied natural gas storage container according to the present invention. Fig.
65 is a side sectional view showing a part of a longitudinal section of a liquefied natural gas storage container according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

In the drawings, like reference numerals refer to like elements throughout. The same reference numerals in the drawings denote like elements throughout the drawings.

1 is a flow chart illustrating a method for producing pressurized liquefied natural gas according to the present invention.

As shown in FIG. 1, the method of producing pressurized liquefied natural gas according to the present invention comprises dehydrating natural gas supplied from a natural gas field 1 without removing acid gas, converting natural gas into NGL (Natural Gas Liquid) Liquefied by pressurization and cooling without distinction to produce pressurized liquefied natural gas, which may include a dewatering step (S11) and a liquefaction step (S12).

According to the dehydration step (S11), moisture such as steam is removed by a dehydration process without supplying natural gas from the natural gas field 1 and removing the acid gas. Accordingly, the natural gas is subjected to a dehydration process without the acid gas removal process, thereby omitting the acid gas removal process, thereby simplifying the process and reducing the investment and maintenance costs. In addition, water is sufficiently removed from the natural gas by the dehydration step (S11) to prevent freezing of moisture of the natural gas at the operating temperature and pressure of the production system.

According to the liquefaction step S12, the natural gas after the dehydration step (S11) is liquefied at a pressure of 13 to 25 bar and a temperature of -120 to -95 ° C without fractionation of NGL (Natural Gas Liquid) Liquefied natural gas, and can produce pressurized liquefied natural gas, for example, at a pressure of 17 bar and a temperature of -115 ° C. Therefore, it is possible to simplify the production process of liquefied natural gas by omitting the fractionation process for NGL, that is, liquefied hydrocarbons, against natural gas, as well as to reduce power consumption for cooling and liquefying natural gas at a cryogenic temperature, And the maintenance cost can be reduced, thereby lowering the unit cost of the liquefied natural gas.

In the method of producing pressurized liquefied natural gas according to the present invention, the condition of the natural gas field 1 may be such that the calculated natural gas has less than 10% of carbon dioxide (CO ₂ ). The method may further include a carbon dioxide removing step (S13) for freezing and removing carbon dioxide in the liquefaction step when carbon dioxide is present in the natural gas after the dewatering step (S11) is 10% or less.

The carbon dioxide removal step (S13) may be carried out when the carbon dioxide in the natural gas after the dehydration step (S11) is more than 2% or less than 10%. Here, if the carbon dioxide is 2% or less, the natural gas is present in the liquid state under the temperature and pressure conditions of the pressurized liquefied natural gas to be described later. Therefore, even if the carbon dioxide removal step (S13) is not performed, the natural gas is affected by the production and transportation of the pressurized liquefied natural gas If the amount of carbon dioxide is more than 2% and less than 10%, it is frozen as a solid. Therefore, the carbon dioxide removal step (S13) is performed for liquefaction.

Upon completion of the liquefaction step S12, a storage step S14 of storing the pressurized liquefied natural gas produced by the liquefaction step S12 in a double-structure storage vessel can be carried out, To accomplish this, a transfer step S15 may be performed in which the storage containers are individually or packaged and transferred through the ship. Of course, the liquefied natural gas transport storage vessels with enhanced strength of the tanks may be individually or packaged and transported through the vessel.

The storage vessel used in the transfer step (S15) may have a material and structure to withstand a pressure of 13 to 25 bar and a temperature of -120 to -95 < 0 > C. In addition, a ship for transporting a storage container can be manufactured without using a separate ship such as a liquefied natural gas carrier, and a conventional barge or container ship can be used to reduce the cost of transporting the storage container.

In this case, it is possible to transport the storage container by carrying the barge or the container line directly or through the minimum modification. Here, the storage container transported by the ship can be transported in the individual storage container unit according to the demand of the consumer.

On the other hand, the pressurized liquefied natural gas stored in the storage container supplied to the customer by finishing the transfer step (S15) is supplied to the natural gas through the regeneration step (S16) in the final consumer site. Here, the regeneration facility for carrying out the regeneration step (S16) may be composed of a high-pressure pump and a vaporizer. In the case of individual units such as a power plant or a factory, a self-regeneration facility may be provided.

2 is a configuration diagram showing a pressurized liquefied natural gas production system according to the present invention.

2, the pressurized liquefied natural gas production system 10 according to the present invention includes a dewatering facility 11 for supplying and dehydrating natural gas from a natural gas field 1, And a liquefaction facility 12 for liquefying the gas at a pressure of 13 to 25 bar and a temperature of -120 to -95 < 0 > C to produce pressurized liquefied natural gas.

The dehydration facility 11 receives natural gas from the natural gas field 1 and removes moisture such as water vapor by a dehydration process to prevent freezing of the natural gas at the operating temperature and pressure of the production system. At this time, the natural gas supplied from the natural gas field 1 to the dehydration facility 11 is not subjected to the process of removing the acid gas, thereby simplifying the production process of the liquefied natural gas, Thereby reducing costs.

The liquefaction facility 12 liquefies the natural gas passing through the dewatering facility 11 at a pressure of 13-25 bar and a temperature of -120 to -95 ° C to produce pressurized liquefied natural gas. For example, a pressure of 17 bar and a pressure of -115 Lt; RTI ID = 0.0 > C, < / RTI > and may include a compressor and a cooler for compressing and cooling the low temperature fluid. The natural gas passed through the dewatering equipment 11 is supplied to the liquefaction facility 12 without being subjected to a process of fractionation of NGL (Natural Gas Liquid), and is subjected to a liquefaction process. As a result, NGL, that is, Reduce the cost of building and maintaining the system, thereby lowering the cost of liquefied natural gas.

The pressurized liquefied natural gas production system 10 according to the present invention is a system for producing carbon dioxide by freezing and removing carbon dioxide And may further include a facility 13.

The carbon dioxide removing facility 13 can perform the removal of carbon dioxide from the natural gas only when the carbon dioxide in the natural gas passed through the dewatering equipment 11 is more than 2% or less than 10%. That is, when the carbon dioxide is less than 2%, the natural gas is in a liquid state under the temperature and pressure conditions of the pressurized liquefied natural gas. Therefore, the removal of carbon dioxide is unnecessary. When the carbon dioxide is more than 2% and less than 10% It is necessary to remove carbon dioxide by the removal equipment 13. [

The pressurized liquefied natural gas produced from the liquefaction plant 12 is stored in the storage structure of the dual structure in the storage facility 14 and transported to the desired consumer site by transportation of the storage container.

3 is a flow chart illustrating a pressurized liquefied natural gas distribution method in accordance with the present invention.

As shown in FIG. 3, the pressurized liquefied natural gas distribution method according to the present invention is a method of distributing pressurized liquefied natural gas, which is pressure-applied to natural gas and cooled by liquefaction, The container is unloaded to the consumer and then the storage container is connected to the re-vaporization system of the consumer. To this end, the pressurized liquefied natural gas distribution method according to the present invention may include a conveying step S21, a unloading step S22, and a connecting step S23.

As shown in FIG. 4, according to the conveying step S21, the pressurized liquefied natural gas obtained by liquefying natural gas at a pressure of 13 to 25 bar and a temperature of -120 to -95 DEG C is stored, 21 are loaded on the vessel 2 and transported to the consumable paper 3. Here, the pressurized liquefied natural gas can be produced by the above-described production method of pressurized liquefied natural gas, and the storage container 21 storing the pressurized liquefied natural gas can pressurize the natural gas at a pressure of 13 to 25 bar and a temperature of -120 to -95 ° C Can have a double structure and can be loaded on the ship 2 in a large number.

The transporting step S21 can transport the storage container 21 by a land transportation means such as a trailer or a train when the consumable product 3 is located inland.

The unloading step S22 is a step of unloading the storage container 21 filled with the pressurized liquefied natural gas by the unloading facility to the consumable paper when the ship 2 arrives at the consumable paper 3, As shown in FIG.

The connecting step S23 is a step of connecting the storage container 21 to the regasification system 23 of the consumer 3 so that the pressurized liquefied natural gas stored in the storage container 21 is vaporized, So that the natural gas generated by vaporizing the pressurized liquefied natural gas can be supplied to the customer 3a. On the other hand, as shown in FIG. 5, the storage vessel 21 is provided with a nozzle 21a for connecting to the vaporization line of the pressurized liquefied natural gas inlet and outlet system 23. Here, the nozzle 21a may be provided in various structures in various positions according to the posture in which the storage container 21 is loaded on the ship 2 and the posture connected to the regasification system 23, and the pressurized liquefied natural gas And may have a connector that can be connected to the connector of the storage facility and recharge system 23.

The method for distributing pressurized liquefied natural gas according to the present invention may further include a collecting step (S24) for collecting the empty storage container (21) from the consumable product (3).

The recovery step S24 allows the storage vessel 21 to be recovered to the location where the pressurized liquefied natural gas production system 10 is located by using the land transportation means or the ship 2 to save the logistics cost, Thereby reducing the supply cost of the apparatus.

As shown in FIG. 6, in the transfer step S21, a single container package 22 in which a plurality of storage containers 21 are packaged can be transferred. Here, the container assembly 22 may be provided with an integrated nozzle 22a connected to each of the storage containers 21 so as to unify the nozzles 21a (shown in Fig. 5) provided for the entry and exit of the pressurized liquefied natural gas. The loading and unloading step S22 in the transporting step S21 is performed by constructing the storage container 21 as a bundle unit by the container assembly 22 and using it as a single container by the integrated nozzle 22a, It is possible to reduce the time and effort required for unloading in the connection step S23, connection to the regeneration system 23 in the connection step S23, and recovery in the recovery step S24.

In the case of the container assembly 22, it is effective to use a plurality of storage containers 21 so as to be unloaded and used in a place where a large number of natural gas is required as a single consumable item such as a power plant or a satin.

In addition, according to the method of distributing pressurized liquefied natural gas according to the present invention, there is an advantage that a separate storage tank is not required in a consuming place. In addition, it is sufficient to provide only the regasification system, and it is also possible to use the land transportation means in parallel with the ship or the ship to circulate from the place where the pressurized liquefied natural gas production system 10 is located to the respective individual consumables 3, The container assembly 22 is unloaded and the empty storage container 21 or the container assembly 22 is recovered. In particular, when a large number of small and medium-size consumed goods such as South-East Asia are dispersed on a large number of islands, a business that minimizes infrastructure construction such as separate storage facilities and pipelines for each consumer site becomes possible.

7 is a perspective view showing a storage tank for liquefied natural gas according to the present invention.

7, the liquefied natural gas storage tank 30 according to the present invention is provided with a plurality of storage containers 32 for storing liquefied natural gas inside the main body 31, Unloading of the liquefied natural gas to the storage container 32 is enabled through the ship loading line 33 which is connected to each of the storage container 32 and the ship's unloading valves 33a and 33b.

The main body 31 is provided with a plurality of storage vessels 32 arranged therein and includes a plurality of spacers 31a provided between the storage vessels 32 so as to maintain a state in which the storage vessels 32 are spaced from each other ).

In addition, the main body 31 may have a heat insulating layer for blocking the entry and exit of the temperature, or may have a double structure for heat insulation, or may have a hexahedral structure or various other structures as in the present embodiment. In addition, the main body 31 may be separated from the ground so as to block heat transmission to the ground, and a plurality of supports 31b may be provided on the bottom surface so as to be installed in a stable posture on the ground.

As shown in FIG. 8, the main body 31 has a standard of large, medium, and small as in (a), (b), and (c) to standardize the number and size of the storage containers 32 The present invention is not limited thereto, and it is possible to accommodate various numbers of storage containers 32, and various sizes can be manufactured.

The storage vessel 32 may be made of a structure or material that can withstand a pressure of 13 to 25 bar and a temperature of -120 to -95 占 폚 together with the undercarriage line 33 to be described later which allows each of the liquefied natural gas to be stored. Therefore, the storage container 32 and the loading / unloading line 33 are provided with a double structure so as to withstand such pressure and temperature conditions, so that a pressure of 13 to 25 bar, a temperature of -120 to -95 ° C, For example, it allows the storage and transport of pressurized liquefied natural gas with a pressure of 17 bar and a temperature of -115 ° C.

9, the ship loading / unloading line 33 is connected to each of the storage containers 32 and extends to the outside of the main body 31, and the loading / unloading of the liquefied natural gas to / from the storage container 32 (33a, 33b) for opening and closing the valve. Therefore, when the ship loading / unloading line 33 is connected to the regeneration system of the consumer, the supply line, or the like after the main body 31 is installed on the consumer, the supply of the liquefied natural gas or natural gas becomes possible immediately.

Here, the line unloading valves 33a and 33b are provided with a first individual valve 33a individually provided to open and close the loading and unloading of liquefied natural gas for each of the storage containers 32, And a first integrated valve 33b installed to open and close the loading and unloading of the liquefied natural gas. If all of the first individual valves 33a are opened as the unloading valves, And can be used as one tank. It is also possible to use only the first individual valve 33a or only the first integrated valve 33b.

The liquefied natural gas storage tank 30 according to the present invention is connected to a part or the whole of the storage container 32 to discharge the evaporation gas naturally generated from the storage container 32 to the outside of the main body 31 And an evaporation gas line 34 in which evaporation gas valves 34a and 34b for opening and closing the discharge of the evaporation gas BOG generated in the storage container 32 are installed. Here, the evaporation gas line 34 can be made of a structure or material that can withstand a pressure of 13 to 25 bar and a temperature of -120 to -95 占 폚.

The evaporation gas valves 34a and 34b also include a second individual valve 34a that is individually installed to open and close the discharge of evaporative gas to each of the storage vessels 32 and a second individual valve 34b, And the second integrated valve 34b may be installed so as to integrally open and close the exhaust of the second integrated valve 34b. Alternatively, only the second individual valve 34a may be installed as the evaporation gas valve, or only the second integrated valve 34b may be installed . Here, as described above, if all of the second individual valves 34a are opened, each of the storage vessels may be packaged into one tank and used. Only the second individual valve 34a may be provided, or only the first integrated valve 34b may be installed.

The liquefied natural gas storage tank 30 according to the present invention includes a pressure sensing unit 35 for measuring the internal pressure of each or all of the storage containers 32 and outputting the measured pressure as a sensing signal, The control unit 36 may be configured to receive the detection signal from the main body 31 and display the internal pressure of each or all of the storage containers 32 to the outside of the main body 31 through the display unit 37. The pressure sensing unit 35 may be installed at the front end of the storage container 32 in the loading and unloading line 33 to measure the internal pressure of each or all of the storage containers 32, And can be installed on an integrated path that moves for loading and unloading of liquefied natural gas in the storage tank 33. The control unit 36 controls the operation of the line loading and unloading valves 33a and 33b and the evaporation gas valves 34a and 34b in accordance with an operation signal output from the operation unit 36a provided in the main body 31 or installed at a remote location, 34b, respectively.

10, the liquefied natural gas storage tank 30 according to the present invention is used for controlling the heating value required in the vaporization and consumption of the liquefied natural gas unloaded from the storage container 32, A heating unit 38 installed to vaporize the liquefied natural gas unloaded from part or all of the storage vessel 32 and a calorific value adjustment unit 39 provided to adjust the calorific value of the natural gas passing through the heating unit 38, . ≪ / RTI > The heating unit 38 and the calorific value adjustment unit 39 may be installed on a line where one or more of the storage containers 32 are integrated in the ship loading / unloading line 33, Line 33 and may be installed in a separate line that allows liquefied natural gas to pass through the valve.

The heating unit 38 includes a plate fin type heat exchanger 38a installed to heat the liquefied natural gas by heat exchange with air and a liquefied natural gas vaporized by passing through the heat exchanger 38a. And an electric heater 38b that is installed to heat the secondary battery.

A bypass line 41 connected to the bypass line 41a may be further connected to a line where the calorific value adjustment unit 39 is installed, for example, the line loading line 33, have. Accordingly, when it is necessary to control the calorific value of the natural gas, the natural gas is supplied to the calorific value adjustment unit 39 by the operation of the bypass valve 41a, The natural gas can bypass the calorific value adjustment unit 39 through the bypass line 41 by the operation of the bypass valve 41a when the calorific value adjustment for the gas is not necessary. Here, the bypass valve 41a may be a three-way valve or a plurality of two-way valves.

The liquefied natural gas storage tank 30 according to the present invention includes a temperature sensing unit 42 for sensing the temperature of the natural gas to be unloaded, And a control unit 36 for receiving the signal of the sensing unit 42 and controlling the electric heater 38b so that the natural gas reaches the set temperature range. The control unit 36 may display the temperature of the natural gas being unloaded to the outside of the main body 31 through the display unit 37. [

Here, the temperature sensing unit 42 may be installed on the outlet side of the ship loading and unloading line 33. Further, the control unit 36 can control the bypass valve 41a described above in accordance with the operation signal of the operation unit 36a.

As described above, the liquefied natural gas storage tank 30 according to the present invention includes the storage container 32 capable of storing and processing the evaporative gas according to the function, and a storage container capable of controlling the evaporation gas, (32), and it is possible to easily transport liquefied natural gas or natural gas in accordance with the demand of the consumer.

11 is a cross-sectional view illustrating a storage vessel for liquefied natural gas according to a first embodiment of the present invention.

11, the liquefied natural gas storage vessel 50 according to the first embodiment of the present invention includes an inner shell 51 made of a metal resistant to the low temperature of the liquefied natural gas stored inside, A heat insulating layer 53 for reducing heat transfer may be installed between the outer shell 52 made of a steel material for covering the outer side of the heat exchanger 51 and for enduring internal pressure.

The inner shell 51 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperature of the liquefied natural gas such as aluminum, stainless steel, 5 to 9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 52 covers the outer side of the inner shell 51 so as to form a space with the inner shell 51 and is made of a steel material for enduring the inner pressure, The internal pressure of the inner shell 51 is shared by the inner pressure of the inner shell 51, thereby reducing the manufacturing cost.

The inner shell 51 has the same or approximate pressure of the inner shell and the heat insulating layer due to the connection passage to be described later, so that the pressure of the pressurized liquefied natural gas can be sustained by the outer shell. Thus, even though the inner shell 51 is manufactured to withstand a temperature of from -120 to -95 占 폚, the inner shell and the outer shell can prevent the above-described pressure (13 to 25 bar) And may be designed to satisfy the above-described pressure and temperature conditions in a state where the outer shell 52 and the heat insulating layer 53 are assembled.

Meanwhile, the inner shell 51 can be formed to have a thickness t1 smaller than the thickness t2 of the outer shell 52, thereby reducing the use of expensive metal having excellent low-temperature characteristics at the time of fabrication.

The heat insulating layer portion 53 is formed of a heat insulating material that is installed in a space between the inner shell 51 and the outer shell 52 and reduces heat transfer. The pressure in the inner shell 51 may be designed to be the same as the pressure in the inner shell 51. Herein, the same pressure as the pressure in the inner shell 51 means that the pressure is substantially the same But also to a similar degree.

The inside of the heat insulating layer portion 53 and the inner shell 51 may be connected to each other by a connection passage 54 for pressure balance between the inside and the outside of the inner shell 51. The pressure in the inner shell 51 is equalized to that in the outer shell 52 by the connecting flow path 54 and the outer shell 52 supports a substantial portion of the pressure, The thickness can be reduced.

12, the connection passage 54 may be formed on the side of the connection portion 55 provided at the entrance 51a of the inner shell 51 in contact with the heat insulating layer 53. Therefore, the pressure in the inner shell 51 moves toward the heat insulating layer 53 through the connection passage 54, so that the pressure is balanced between the inside and the outside of the inner shell 51.

13, the heat transfer is reduced between the inner shell 51 made of a metal having excellent low-temperature characteristics and the outer shell 52 made of a steel material having excellent strength, and a proper BOR (Boil Off Rate The liquefied natural gas as well as the pressurized liquefied natural gas can be stored and the inner shell 51 and the inner shell 51 can be separated from each other due to the pressure balance between the inner side and the outer side of the inner shell 51 The thickness t1 of the metal layer can be reduced to reduce the use of expensive metals having excellent low-temperature characteristics. Also, it is possible to prevent the occurrence of structural defects due to the internal pressure of the inner shell 51, and to provide the storage container 50 with excellent durability.

The connecting portion 55 is integrally formed with the inlet port 51a formed for supplying and discharging the liquefied natural gas in the inner shell 51 so as to protrude to the outside of the outer shell 52, May be connected.

As shown in FIG. 14, according to the storage vessel of the liquefied natural gas according to the second embodiment of the present invention, the outer heat insulating layer 56 can be installed outside the outer shell 52 for heat insulation. Here, the outer insulating layer 56 may be attached to the outer shell 52 so as to surround the outer shell 52, or may be kept in a state of wrapping the outer shell 52 by its own shape, Thereby preventing heat transfer to the outside. Accordingly, it is possible to reduce BOG generated from liquefied natural gas or pressurized liquefied natural gas stored in a storage container in a high temperature environment such as a tropical region.

As shown in FIG. 15, according to the storage vessel of the liquefied natural gas according to the third embodiment of the present invention, a heating member 57 installed for heating may be installed outside the outer shell 52. In addition, the heating member 57 may be a fuel circulation line for supplying heat to the outer shell 52 by circulation of the heat, or may be a battery or a capacitor attached to the storage container 50 or a power source And may be formed of a plate-like heat generating element capable of being bent, or a hot line wound around the outer surface of the outer shell 52 as in the present embodiment.

Accordingly, by preventing the liquefied natural gas or the pressurized liquefied natural gas stored in the storage container from being influenced by external cold air in a low-temperature environment such as the polar region, the outer shell 52 can be manufactured as a general steel plate, .

16 is a cross-sectional view illustrating a storage vessel for liquefied natural gas according to a fourth embodiment of the present invention. 16, the storage vessel 60 for liquefied natural gas according to the fourth embodiment of the present invention includes an inner shell 61 in which liquefied natural gas is stored, and an inner shell 61 surrounding the inner shell 61 A support 63 for supporting the inner shell 61 and the outer shell 62 between the outer shells 62 and a heat insulating layer 64 for reducing heat transfer are provided. In order to supply and discharge the liquefied natural gas to the inner shell 61, a connecting portion (not shown) may be integrally connected to the inlet and outlet of the inner shell 61 to protrude outside the outer shell 62, An external member such as a valve may be connected to the connection portion.

The inner shell 61 forms a space for storing liquefied natural gas inside and is made of a metal that is resistant to low temperatures of liquefied natural gas such as aluminum, stainless steel, 5 to 9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 62 may be made of a steel material to wrap the outer side of the inner shell 61 to withstand the inner pressure so as to form a space with the inner shell 61, It is possible to reduce the manufacturing cost by reducing the amount of material of the inner shell 61 by sharing the internal pressure applied thereto.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell since the inner shell 61 has the same or approximate pressure of the inner shell and the heat insulating layer by the connecting flow path. Thus, even though the inner shell 61 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13-25 bar) and the temperature conditions described above by the inner shell and the outer shell, And the outer shell 62, the support 63 and the heat insulating layer 64 are assembled together so as to satisfy the above-mentioned pressure and temperature conditions.

The support 63 is installed in the space between the inner shell 61 and the outer shell 62 so as to support the inner shell 61 and the outer shell 62 so that the inner shell 61 and the outer shell 62 are structurally And may be made of a metal (e.g., low temperature steel) to withstand the low temperature of the liquefied natural gas, and may be made of a single material along the side edges of the inner shell 61 and the outer shell 62, Or may be installed at a plurality of spaced apart upper and lower sides of the inner shell 61 and the outer shell 62 as in the present embodiment.

18, the support 63 includes first and second flanges 63a and 63b supported on the outer surface of the inner shell 61 and the inner surface of the outer shell 62, respectively, And a first web 63c provided between the second flanges 63a and 63b. Here, each of the first and second flanges 63a and 63b may be formed in a ring shape, or may be formed of a curved member in which a ring shape is divided into a plurality of parts.

In addition, the support table 63 may be welded and fixed to the outer surface of the inner shell 61 and the inner surface of the outer shell 62 without using a separate member such as a flange. At this time, glass fiber may be inserted into the support to prevent heat from being transmitted to the outside via the support.

The first web 63c may include a plurality of gratings having both ends fixed to the first and second flanges 63a and 63b. Here, the grating can be fixed in such a manner that a part mainly receives the compressive force between the first and second flanges 63a and 62b, the rest can be fixed to form a truss structure, and the shape and fixing position can be changed or adjusted, The same is true when the web 63c is welded and fixed to the inner and outer shells.

A heat insulating member 65 for preventing heat transfer may be provided between the inner surface of the outer shell 62 and the second flange 63b. Here, the heat insulating member 65 may be made of glass fiber and prevents the temperature of the inner shell 61 from being transmitted to the outer shell 62 by the support 63.

In the case where the support table 63 is fixed by welding, a heat insulating member such as glass fiber is disposed at the end of the support table 63 which is in contact with the outer shell 62 and is fixed by welding or a separate heat insulating member It is possible to prevent the temperature of the inner shell 61 from being transmitted to the outer shell 62 by the support table 63. In addition,

The liquefied natural gas storage vessel 60 according to the present invention includes a lower support 66 installed in a lower space between the inner shell 61 and the outer shell 62 to support the inner shell 61 and the outer shell 62 ). Here, the lower support 66 includes third and fourth flanges respectively supported on the outer side surface of the inner shell 61 and the inner side surface of the outer shell 62, and the second web 66 provided between the third and fourth flanges. And the second web may be formed of a plurality of gratings having both ends fixed to the third and fourth flanges respectively. The contrasting components are the same. Further, a heat insulating member (not shown) may be installed between the inner surface of the outer shell 62 and the fourth flange to block heat transfer. Here, the heat insulating member may be made of glass fiber.

The insulating layer portion 64 is provided in a space between the inner shell 61 and the outer shell 62 and is made of a heat insulating material that reduces heat transfer. The pressure in the inner shell 61 may be designed to be the same as the pressure in the inner shell 61. Here, the same pressure as the pressure in the inner shell 61 is not strictly the same, 12 for the pressure balance between the inner side and the outer side of the inner shell 61. In the embodiment shown in Fig. 12, (Shown in FIG. 12), and the connection flow path 54 has been described in detail in the previous embodiment, and a description thereof will be omitted.

The insulating layer portion 64 may be made of a heat insulating material (for example, perlite) in the form of a grain that can pass through the support 63, in particular, the web 63c of the grating structure. Accordingly, the particle-shaped heat insulating layer 64 can be freely mixed and filled in the filling, so that no gap is formed between the inner shell 61 and the outer shell 62, and the heat insulating performance can be improved.

In addition, by the support 63 and the lower support 66 of the grating support structure system, the particle flow of the heat insulating layer 64 can be made free during filling, and the heterogeneity of the heat insulating layer 64 can be prevented.

19, the liquefied natural gas storage vessel 70 according to the fifth embodiment of the present invention can also be installed in the lateral direction, in which case the lower support 66 (Fig. 16 ) Can be omitted.

20 is a cross-sectional view illustrating a storage vessel of liquefied natural gas according to a sixth embodiment of the present invention.

20, the storage vessel 80 for liquefied natural gas according to the sixth embodiment of the present invention includes an inner shell 81 in which liquefied natural gas is stored inside, and an inner shell 81 surrounding the inner shell 81 A heat insulating layer 84 for reducing heat transfer is provided between the outer shell 82 and the outer surface of the inner shell 81 and the inner surface of the outer shell 82 are connected by the metal shim 83. In order to supply and discharge the liquefied natural gas to the inner shell 81, a connecting portion (not shown) may be integrally connected to the entrance of the inner shell 81 to protrude outside the outer shell 82, An external member such as a valve may be connected to the connection portion.

The inner shell 81 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperature of the liquefied natural gas such as aluminum, stainless steel, 5-9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 82 may be made of a steel material to wrap the outer side of the inner shell 81 to withstand the inner pressure to form a space with the inner shell 81, By sharing the internal pressure applied, the material of the inner shell 81 can be saved, and manufacturing cost can be reduced.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell since the inner shell 81 has the same or approximate pressure of the inner shell and the heat insulating layer by the connecting flow path. Thus, even though the inner shell 81 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13-25 bar) and the temperature conditions described above by the inner shell and the outer shell, Liquefied natural gas having a temperature of at least 50 DEG C and may be designed to satisfy the above-described pressure and temperature conditions in the state where the outer shell 82, the metal shim 83 and the insulating layer portion 84 are assembled .

The metal shim 83 is connected to the outer surface of the inner shell 81 and the inner surface of the outer shell 82 so that the inner shell 81 and the outer shell 82 are supported by each other, And may be installed along the side of the shell 82. In the present embodiment, the inner shell 81 and the outer shell 82 may be provided with a plurality of spaced apart upper and lower sides. The metal padding 83 may be formed of a wire such as a steel wire. The metal shim 83 is connected to an outer surface of the inner shell 81 and a plurality of rings provided on the inner surface of the outer shell 82 or is fastened or welded to a plurality of supporting points 83a , And the inner shell 81 and the outer shell 82 by various other methods.

21, the metal shim 83 is connected to the two supporting points 83a of the outer shell 82 adjacent to one support point 83a of the inner shell 81, One support point 83a may be repeatedly connected to two supporting points 83a of the inner shell 81 adjacent thereto and connected so as to be staggered along the circumference between the inner shell 81 and the outer shell 82 And as shown in (a) and (b), the number of connections and the number of connections may be different.

The liquefied natural gas storage vessel 80 according to the present invention includes an inner shell 81 and a lower support 86 installed in a lower space between the inner shell 81 and the outer shell 82 to support the outer shell 82 ). Here, the lower support 86 may include a flange supported on the outer surface of the inner shell 81 and an inner surface of the outer shell 82, respectively, and a web provided between the flanges, And these components are the same as those of the lower support 66 of the liquefied natural gas storage container 60 according to the above-described fourth embodiment, and thus the description thereof will be omitted.

The insulating layer portion 84 is formed of a heat insulating material that is installed in a space between the inner shell 81 and the outer shell 82 and reduces heat transfer. In addition, a structure or a material design can be applied to the heat insulating layer 84 so that the same pressure as the pressure in the inner shell 81 is applied. Here, the same pressure as the pressure in the inner shell 81 is the same in the strict sense But also includes cases with slight differences. 12) for pressure balance between the inside and the outside of the inner shell 81, as in the previous embodiment shown in Fig. 12, And the connection passage 54 is described in detail in the previous embodiment, and thus the description thereof will be omitted.

The insulating layer portion 84 may be made of a heat insulating material in the form of a grain that can pass through the metal padding 83. Therefore, it is possible to prevent the heterogeneity of the heat insulating layer portion 84 from being generated because the gap between the inner shell 81 and the outer shell 82 does not occur because the particle-shaped heat insulating layer portion 84 can be freely mixed and filled at the time of filling. Insulation performance is ensured.

22, the liquefied natural gas storage vessel 90 according to the present invention can also be installed in the lateral direction, in which case the lower support 86 (FIG. 20) in the previous embodiment can be omitted have.

23 is a configuration diagram showing a storage vessel for liquefied natural gas according to an eighth embodiment of the present invention.

23, the liquefied natural gas storage container 510 according to the eighth embodiment of the present invention includes an inner shell 511 in which liquefied natural gas is stored inside, and an inner shell 511 surrounding the inner shell 511 The inner space of the inner shell 511 and the space between the inner shell 511 and the outer shell 512 are connected to each other by an equalizing line 514. Further, a heat insulating layer portion 513 may be provided between the inner shell 511 and the outer shell 512.

The inner shell 511 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperature of the liquefied natural gas such as aluminum, stainless steel, 5-9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell since the pressure of the inner shell and the pressure of the heat insulating layer is equal or approximated by the connecting flow path of the inner shell 511. Thus, even though the inner shell 511 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13 to 25 bar) and the temperature condition described above by the inner shell and the outer shell, And may be designed to satisfy the above-described pressure and temperature conditions in a state where the outer shell 512 and the heat insulating layer 513 are assembled.

A first exhaust line 515 is connected to an upper portion of the inner space of the inner shell 511 and extends to the outside and a first exhaust valve 515a for opening and closing the flow of gas is installed in the first exhaust line 515 . Accordingly, the first exhaust line 515 allows the gas to be discharged from the inner space of the inner shell 511 to the outside by opening the first exhaust valve 515a.

The first and second connection portions 516a and 516b are connected to the upper and lower ends of the inner space of the inner shell 511, respectively, and are passed through the outer shell 512 and protrude to the outside. Accordingly, the natural gas can be supplied to the inner side of the inner shell 511 through the conduit line 7 connected to the first connection portion 516a and the load line 8 connected to the second connection portion 516b. So that the liquefied natural gas inside the inner shell 511 can be unloaded. On the other hand, valves 7a and 8a may be installed in the booster line 7 and the loading line 8, respectively.

The outer shell 512 surrounds the inner shell 511 so as to form a space with the inner shell 511 and is made of a steel material to withstand the inner pressure, So that the material of the inner shell 511 can be reduced, thereby reducing manufacturing costs.

Meanwhile, the inner shell 511 may be formed to have a thickness smaller than the thickness of the outer shell 512, thereby reducing the use of expensive metals having excellent low-temperature characteristics at the time of manufacturing the storage container 510.

The heat insulating layer portion 513 is provided in a space between the inner shell 511 and the outer shell 512 and is made of a heat insulating material that reduces heat transfer. Further, a structure or a material design can be applied to the heat insulating layer portion 513 so that the same pressure as the pressure in the inner shell 511 is applied.

The equalizing line 514 connects the inner space of the inner shell 511 and the outer space of the inner shell 511 by connecting the spaces between the inner shell 511 and the outer shell 512 to each other , Thereby minimizing the internal pressure of the inner shell 511 and the pressure difference between the inner shell 511 and the outer shell 512 so that these pressures can be balanced with each other. Therefore, the pressure difference between the inner side and the outer side of the inner shell 511 is minimized, thereby reducing the pressure imposed on the inner shell 511, thereby reducing the thickness of the inner shell 511, It is possible to reduce the use of metal, prevent the occurrence of structural defects due to the internal pressure of the inner shell 511, and provide a durable storage container 510.

A support 517 may be installed in the space between the inner shell 511 and the outer shell 512 to support the inner shell 511 and the outer shell 512. The support 517 structurally reinforces the inner shell 511 and the outer shell 512 and can be made of metal to withstand the low temperature of the liquefied natural gas and has an inner shell 511 and an outer shell 512 Or may be installed at a plurality of intervals vertically at the sides of the inner shell 511 and the outer shell 512 as in the present embodiment.

A lower support 518 may be installed in the lower space between the inner shell 511 and the outer shell 512 to support the inner shell 511 and the outer shell 512.

The support base 517 and the lower support base 518 are provided with flanges respectively supported on the inner surfaces of the inner shell 511 and the outer shell 512 and the webs provided between the flanges, And the web may be comprised of a plurality of gratings secured at either end to each of the flanges and a heat insulating member such as glass fiber or the like may be provided to prevent heat transfer between the outer shell 512 and the flange. 20, the support base 517 is connected to the outer surface of the inner shell 511 and the inner surface of the outer shell 512 so that the inner shell 511 and the outer shell 512 Can be supported with each other.

24, the liquefied natural gas storage container according to the ninth embodiment of the present invention includes an opening / closing valve 514a for opening / closing a flow of a fluid, for example, a natural gas or an evaporating gas, Can be installed. Therefore, in the case of changing the position or posture of the storage container, the movement of the fluid through the equalizing line 514 can be blocked by the on-off valve 514a

25, according to the liquefied natural gas storage container according to the tenth embodiment of the present invention, the second exhaust line 514c in which the second exhaust valve 514b is installed in the equalizing line 514 The gas inside the inner shell 511 can be discharged to the outside through the equalizing line 514 and the second exhaust line 514c by opening the second exhaust valve 514b. Accordingly, a complicated process for connecting the exhaust line to the inner shell 511 can be avoided, and the exhaust line can be easily installed while maintaining the structural stability.

26 is a cross-sectional view illustrating a storage vessel for liquefied natural gas according to an eleventh embodiment of the present invention.

26, the liquefied natural gas storage vessel 100 according to the eleventh embodiment of the present invention includes an inner shell 110 made of metal for enduring low temperature of liquefied natural gas, A heat insulating layer 130 for reducing heat transfer is provided between the outer shell 120 surrounding the outer shell 120 and a connecting portion 140 is provided for the inner shell 110 and the outer shell 120. The connecting portion 140 is formed of a non- A first flange 142 for flange connection is provided at an end of the injection part 141 extending outwardly from the inner shell 110 in a state of being in contact with the valve 4, A second flange 144 for flange connection to the valve 4 is formed at the end of the extended portion 143 that extends to surround the valve 4.

The inner shell 110 forms a space for storing liquefied natural gas inside and is made of a metal that is resistant to low temperatures of liquefied natural gas such as aluminum, stainless steel, 5 to 9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 120 surrounds the inner shell 110 to form a space with the inner shell 110 and may be made of a steel material to withstand the inner pressure, The internal pressure of the inner shell 110 is shared by the internal pressure, thereby reducing manufacturing costs.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell because the inner shell 110 has the same or approximate pressure of the inner shell and the heat insulating layer due to the connecting flow path. Accordingly, even though the inner shell 110 is manufactured to withstand a temperature of -120 to -95 占 폚, the inner shell and the outer shell can prevent the above-described pressure (13-25 bar) And may be designed to satisfy the pressure and temperature conditions in a state where the outer shell 120 and the heat insulating layer 130 are assembled.

Meanwhile, the inner shell 110 may be formed to have a thickness smaller than the thickness of the outer shell 120, thereby reducing the use of expensive metal having excellent low-temperature characteristics during fabrication.

The heat insulating layer 130 is provided in a space between the inner shell 110 and the outer shell 120 and is made of a heat insulating material that reduces heat transfer. In addition, the insulation layer 130 may be structurally or materially designed so as to apply the same pressure as the pressure in the inner shell 110, wherein the same pressure as the pressure in the inner shell 110 is the same in the strict sense Not a certain degree of pressure, however, is relevant.

The interior of the heat insulating layer 130 and the inner shell 110 may be connected to each other by a connection passage (not shown) for pressure balance between the inside and the outside of the inner shell 110. Here, the connection channel may include various embodiments that can provide a channel such as a hole, a pipe, and the like. For example, the connection channel may be a hole formed in the injection unit 141 of the connection unit 140. Therefore, the inner pressure of the inner shell 110 and the inner pressure of the heat insulating layer 130 are maintained to be equal to each other by moving the pressure in the inner shell 110 to the heat insulating layer 130 side through the connection passage.

The connecting portion 140 is formed such that the first flange 142 comes into direct contact with the valve 4 and is flanged by the bolt 181 and the nut 182 so that the flow path between the injecting portion 141 and the valve 4 is connected For example, aluminum, stainless steel, or 5 to 9% nickel steel or the like, which has the same material as the inner shell 110, for example, low temperature characteristics, because the inlet portion 141 and the first flange 142 directly contact the liquefied natural gas. Lt; / RTI >

The connecting portion 140 may be formed in a shape such that the extension portion 143 surrounds the outer portion of the injection portion 141 with an interval and the second flange 144 surrounds the valve 4 And the extension portion 143 and the second flange 144 may be made of a steel material.

27, the connecting portion 150 is integrally formed with the injection portion 151 by screwing the first flange 152 to the injection portion 151. As shown in FIG.

28, the connecting portion 160 may be configured such that the first flange 162 is fixed to the injection portion 161 with a fastening member 163 such as a bolt or a screw. The fastening member 163 may be fastened through the first flange 162 to the fastening portion 163a formed at the end of the injection portion 161 along the circumferential direction.

When a bolt is used as the fastening member 163, a female thread is machined to the engaging portion 163a and the first flange 162 as shown in Fig. 28 (a), and a bolt, The head of the bolt having the male screw thread is fastened to the first flange 162 in order to accommodate the head portion of the bolt in order to avoid interference with the peripheral members, Shape can be processed.

However, if the head of the bolt is configured so as to protrude out of the first flange, as shown in FIG. 28 (b), the head of the bolt can be accommodated in the valve 4 side to avoid interference between the head of the bolt and the surrounding members. The shape of the bolt head should be machined so as to be fastened to the first flange.

29, the connecting portion 170 is formed by the bolts 181 and the nuts 182 in a state where the second flange 174 is positioned at the edge of the first flange 172 and in contact with the valve 4 Flange can be connected. At this time, the first flange 172 can be coupled to the valve 4 only with the bolts 183.

30 is an enlarged view showing a liquefied natural gas storage container according to a twelfth embodiment of the present invention.

30, a storage vessel 520 for liquefied natural gas according to a twelfth embodiment of the present invention includes an inner shell 521 inside which liquefied natural gas is stored, and an inner shell 521 surrounding the inner shell 521 A buffering part 525 is provided between the inner shell 521 and the connection part 524 connected to the external injection part 9a and protruding to the heat insulating layer part 523 to buffer heat shrinkage Further, a heat insulating layer 523 may be provided in a space between the inner shell 521 and the outer shell 522.

The inner shell 521 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperature of the liquefied natural gas such as aluminum, stainless steel, 5-9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 522 surrounds the inner shell 521 so as to form a space with the inner shell 521 and is made of a steel material to withstand the inner pressure, So that the material of the inner shell 521 is reduced, thereby reducing manufacturing costs.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell since the inner shell 521 has the same or approximate pressure of the inner shell and the heat insulating layer due to the connecting flow path. Accordingly, even though the inner shell 521 is manufactured to withstand a temperature of -120 to -95 占 폚, the inner shell and the outer shell can prevent the above-described pressure (13-25 bar) And may be designed to satisfy the above-described pressure and temperature conditions in a state where the outer shell 522 and the heat insulating layer 523 are assembled.

Meanwhile, the inner shell 521 may be formed to have a thickness smaller than the thickness of the outer shell 522, thereby reducing the use of expensive metal having excellent low-temperature characteristics at the time of manufacturing the storage container 520.

The heat insulating layer 523 is provided in a space between the inner shell 521 and the outer shell 522 and is made of a heat insulating material that reduces heat transfer. In addition, a structure or a material design can be applied to the insulating layer portion 523 so that the same pressure as the pressure in the inner shell 521 is applied.

The connection portion 524 is formed to protrude from the inner shell 521 and is connected to the injection port 521a formed to inject the liquefied natural gas from the inner shell 521 and protrudes outward, May be connected to an external injection part 9a for injecting natural gas and may be connected to the inner shell 521 through a buffer part 525. [ At this time, the outer shell 522 has an extended portion 522a at one side so as to surround the connection portion 524. For example, the end of the extended portion 522a is connected to the external injection portion 9a together with the connection portion 524 .

The buffering part 525 is provided to buffer heat shrinkage between the inner shell 521 and the connecting part 524 to buffer shrinkage due to heat generated in the inner shell 521 to prevent the load from being concentrated on the connecting part 524 do.

The cushioning portion 525 may be formed in the form of a pipe forming a joint portion 525b such that both ends of the cushioning portion 525 are connected to the injection port 521a and the connection portion 524 of the inner shell 521 by flange connection or the like . The buffer 525 may be integrally formed between the inner shell 521 and the connecting portion 524.

As shown in FIG. 31, the buffer 525 may have a loop 525a. In this embodiment, the loop 525a may be formed in a single shape, and the planar shape of the loop 525a may be polygonal, for example, a square.

As shown in Figure 32 (a), the cushioning portion 526 is formed of a single loop 526a, and the planar shape of the cushioning portion 526 may be circular. As shown in Figure 32 (b) The coil 527 may have a coil shape having a plurality of loops 527a. The coil 527 may have a rhombic shape whose width decreases from the center to both ends. Thus, the impact due to the heat shrinkage of the inner shell 521 is alleviated by the loops 526a and 527a.

FIG. 33 is a configuration diagram showing an apparatus for producing liquefied natural gas according to the present invention.

The apparatus 200 for producing a liquefied natural gas according to the present invention is provided with a heat exchanger 230 in a first branch line 221 branched from a natural gas supply line 220, The natural gas supplied through the first branch line 221 is cooled using the refrigerant supplied from the refrigerant supply unit 210 and the condensed carbon dioxide is removed from the heat exchanger 230 by the regeneration unit 240 The regenerating fluid is supplied instead of the natural gas.

The apparatus 200 for producing liquefied natural gas according to the present invention can be applied not only to liquefied natural gas but also to pressurized liquefied natural gas pressurized at a constant pressure, for example, pressurized liquefied natural gas cooled to -120 to -95 占 폚 at a pressure of 13 to 25 bar It can also be used for the production of gas.

The coolant supply unit 210 supplies the coolant for heat exchange with the natural gas to the heat exchanger 230 so that the natural gas is liquefied in the heat exchanger 230.

The heat exchanger 230 is installed in the first branch line 221 branched from the supply line 220 of the natural gas so that a plurality of the natural gas are supplied in parallel to each other, By cooling the heat by the heat exchange with the refrigerant supplied from the supply part 210 and allowing the total capacity to exceed the production amount of the liquefied natural gas, so that one or a plurality of the natural gas can be maintained in the standby state during the production of the liquefied natural gas.

The number and capacity of the heat exchanger 230 can be determined in consideration of the amount of liquefied natural gas produced in the entire plant. For example, in the case of the heat exchanger 230 capable of 20% of the total amount of liquefied natural gas, And five of them can be operated, and the rest can be kept in the standby state. This configuration allows the total amount of liquefied natural gas in the entire plant to be kept constant since the heat exchanger in the stand-by state can be operated while the frozen carbon dioxide is removed and the operation is stopped for the frozen heat exchanger.

The regeneration unit 240 selectively supplies a regeneration fluid to the heat exchanger 230 in place of the natural gas to remove the carbon dioxide condensed therein. The regeneration section 240 includes a regeneration fluid supply section 241 for supplying the regeneration fluid and a regeneration fluid supply section 241 for regeneration fluidly connected to the front end and the downstream end of the heat exchanger 230 in the first branch line 221 from the regeneration fluid supply section 241, A first valve 243 installed at a front end and a rear end of a portion where the regeneration fluid line 242 is connected at each of the fluid line 242 and the first branch line 221, And a second valve 244 installed at the front end and the rear end of each of the units 230.

Here, the regeneration fluid supply unit 241 can use high temperature air as a regeneration fluid, and supplies the high temperature air to the heat exchanger 230 side using a pressure or a pumping force to convert the condensed carbon dioxide into a liquid state or a gas state It can be removed by phase change.

The apparatus 200 for producing a liquefied natural gas according to the present invention includes a heat exchanger 230 for confirming whether or not carbon dioxide is frozen in each of the heat exchangers 230 and for controlling supply of the regenerant fluid to each of the heat exchangers 230, And a regeneration fluid supply unit 241 for receiving the sensing signals output from the sensing unit 250 and the first and second valves 243 and 244 and the regeneration fluid supply unit 241. The sensing unit 250 is installed to detect freezing of carbon dioxide, And a control unit 260 for controlling the control unit 260.

The control unit 260 checks the heat exchanger 230 in which the freezing of carbon dioxide has occurred from the sensing signal output from the sensing unit 250. In order to supply the regenerating fluid to the heat exchanger 230, 243 to block the natural gas supply to the heat exchanger 230 and to supply the regenerant fluid to the heat exchanger 230 by driving the regenerant fluid supply unit 241 and opening the second valve 244, So that the carbon dioxide frozen in the heat exchanger 230 is liquefied or vaporized by the regeneration fluid to be removed. On the other hand, the control unit 260 can count the regeneration fluid to the heat exchanger 230 by a timer and supply the regeneration fluid until the set time is over.

The sensing unit 250 may be a flow meter for measuring the flow rate of the liquefied natural gas that is installed at the rear end of the heat exchanger 230 in each of the first branch lines 221 as in the present embodiment. Therefore, when the flow rate measured by the sensing unit 250, which is a flowmeter, is less than the set value, it can be determined that freezing of carbon dioxide has occurred in the corresponding heat exchanger 230.

In addition to the flow meter, the sensing unit 250 may include a carbon dioxide measuring device installed in each of the first branch lines 221 to measure a content of carbon dioxide contained in gas before and after the heat exchanger 230, It can be determined that the freezing of carbon dioxide has occurred in the heat exchanger 230 when the difference in the amount of carbon dioxide contained in the gas measured at the front and rear ends of the unit 230 is equal to or greater than the set amount.

The apparatus 200 for producing liquefied natural gas according to the present invention includes a refrigerant line 211 for supplying the refrigerant from the refrigerant supply unit 210 to the heat exchanger 230 to stop the operation of the heat exchanger 230 in which the freezing of carbon dioxide occurs And a third valve 270 installed at the front end and the rear end of each of the heat exchangers 230. Here, the third valve 270 may be controlled by the controller 260. For example, the control unit 260 controls the front end and the rear end of the heat exchanger 230 in which the carbon dioxide is frozen through the sensing unit 250 So that the operation of the heat exchanger 230 in which the carbon dioxide is frozen is stopped.

34 and 35 are a side view and a front view showing a floating structure having a storage tank transportation device according to the present invention.

34 and 35, a floating structure 300 having a storage tank conveying device according to the present invention is mounted on a floating structure 320 installed to float on the sea by buoyancy, (310). Here, the floating structure 320 may be a barge-type structure or a vessel capable of navigating using its own thrust.

The storage tank transport apparatus 310 according to the present invention is provided with a rail 312 along the moving direction of the storage tank 330 on the storage table 311a which is lifted and lowered by the lifting unit 311, 330 are mounted on the rail 312 so as to be movable along the rail 312.

By doing so, it is possible to reduce the impact applied to the storage tank rather than transporting the storage tank using a crane or the like, and also it is possible to transport a large amount of cargo to a long distance by connecting a plurality of storage tanks, It is more efficient than the means. In addition, this is not a method of lifting the storage tank, so it may be more effective in moving a relatively heavy storage tank.

Although the storage tank transport apparatus 310 according to the present invention is installed in the floating structure 320 as in the present embodiment, the storage tank transport apparatus 310 may be fixed to the ground or installed in various other transport apparatuses.

The storage tank 330 may store liquefied natural gas or liquefied natural gas which is pressurized to a certain pressure. In addition, various types of cargo may be stored. On the other hand, the pressurized liquefied natural gas may be natural gas liquefied at a pressure of 13 to 25 bar and a temperature of -120 to -95 DEG C, and in order to store such pressurized liquefied natural gas, It can be made of sufficient material and structure to withstand.

Also, as described above, the internal pressure of the double structure and the pressure inside the storage tank 330 are balanced with each other so that the liquefied natural gas or the liquefied natural gas pressurized at a constant pressure can be stored. So that the double structure of the storage tank and the interior of the storage tank may have a connection flow path.

36, the lifting unit 311 lifts the lifting base 311a up and down. For example, the lifting base 311a can be lifted up to the upper surface of the bottom wall 5 from the floating structure 320 have. Here, the loading platform 311a may be provided with a moving foot 311b which rotates downward on one side or both sides of the lower hinge engaging portion 311c to open a path for moving the loading carriage 313 .

The movable pedestal 311b restricts the movement of the conveyance truck 313 when the pedestal 311b is folded upward and when the elevation part 311 raises the stand 311a to a height equal to the height of the sidewall 5 Thereby facilitating the connection between the quay wall 5 and the stacking platform 311a, thereby safely moving the transporting platform 313 to the shore. In addition, the movable footrest 311b may be provided with an auxiliary rail 311d connected to the rail 312 on a surface facing upward when the footrest 311b is deployed downward.

Various structures and actuators can be used for the elevating unit 311 to elevate and lower the elevating unit 311a. For example, a plurality of assemblies 311a may be slidably coupled to the lower portion of the loading unit 311a The stacking table 311 can be vertically movable by a plurality of link members or the like which are connected to each other at the lower part of the member or the stacking table 311a so as to be vertically extended or retracted in the rotating direction, It is possible to raise and lower the pallet 311a by using an actuator such as a motor that provides a driving force or a cylinder that operates by hydraulic pressure.

The rails 312 are installed along the moving direction of the storage tank 330 on the stacking table 311a so that they have the same width as the rails (not shown) of the trains located on the rear wall 5 In order to have the same effect. When the conveyance truck 313 raised to the upper surface of the inner wall 5 by the elevating portion 311 moves along the rail 312 and moves to the rail on the seam 5, Movement becomes possible.

The transporting truck 313 is provided with a plurality of wheels 313a which are movable along the rail 312 and a storage tank 330 is mounted on an upper portion of the transporting truck 313. In order to connect the other transporting trucks 313, A connection part may be provided. The transfer bobbin 313 may be provided on the upper surface with a tank protector 313b made of steel to protect the storage tank 330 from corrosion and external impact by mounting the storage tank 330. [

The transfer truck 313 can be moved along the rail 312 by driving the winch, for example, by being connected to the winch via a cable. Alternatively, the transfer truck 313 may be moved And can travel along the rail 312 by a magnetic force by a driving unit (not shown).

37 is a configuration diagram showing a high-pressure holding system of a pressurized liquefied natural gas storage vessel according to the present invention. 37, the high pressure maintenance system 400 of the pressurized liquefied natural gas storage vessel according to the present invention is connected to the storage tank 6 of the consumable article from the storage container 411 to enable the unloading of the pressurized liquefied natural gas A portion of the pressurized liquefied natural gas that is unloaded through the unloading line 410 is supplied to the storage container 411 by supplying the pressure supplement line 420 and the evaporator 430 ).

The unloading line 410 is connected to the storage tank 6 of the consumable paper from the storage container 411 to enable the unloading of the pressurized liquefied natural gas and the pressure of the pressurized liquefied natural gas stored in the storage container 411 So that the gas can be unloaded to the storage tank 6. This is because the loading line 410 is extended from the upper part to the lower part of the storage tank 6 so that the pressurized liquefied natural gas can be unloaded to the storage tank 6 only by the pressure of the pressurized liquefied natural gas stored in the storage container 411 And the occurrence of evaporation gas can be minimized.

If the unloading line 411 is connected to the lower portion of the storage tank 6 to reduce the amount of evaporation gas generated during unloading, the pressurized liquefied natural gas is loaded from the bottom of the storage tank, However, since the pressure may be insufficient to reliably depressurize the pressurized liquefied natural gas to the storage tank 6 only by the pressure of the pressurized liquefied natural gas stored in the storage container 411, a pump should be additionally installed in the unloading line.

The pressure replenishing line 420 is branched from the unloading line 410 and connected to the storage container 411, and an evaporator 430 is installed. The pressure replenishing line 420 may be connected to the upper portion of the storage container 411 so that the natural gas supplied to the storage container 411 through the pressure replenishing line 420 is supplied to the pressurized liquefied Thereby minimizing the liquefaction by contact with natural gas, thereby lowering the pressure reduction of the storage container 411.

The evaporator 430 vaporizes the pressurized liquefied natural gas supplied through the pressure replenishing line 420 to be supplied to the storage container 411. The natural gas vaporized by the evaporator 430 through the pressure replenishing line 420 is supplied to the storage vessel 411 so that the pressure in the storage vessel 411 which is reduced upon the initial unloading of the pressurized liquefied natural gas is increased , So that the pressure in the storage container 411 is kept above the bubble point pressure of the liquefied natural gas.

The high pressure maintenance system 400 of the pressurized liquefied natural gas storage vessel according to the present invention further includes an evaporation gas line 440 and a compressor 450 so as to recover the evaporated gas generated in the storage tank of the consumable product as liquefied natural gas .

The evaporation gas line 440 is installed to supply the evaporation gas generated from the storage tank 6 to the storage container 411. The evaporation gas line 440 is connected to the lower portion of the storage container 411, Increase the recovery rate.

The compressor 450 is installed in the evaporation gas line 440 and compresses the evaporation gas supplied along the evaporation gas line 440 to be stored in the storage container 411. Accordingly, during the unloading of the pressurized liquefied natural gas, the evaporation gas generated in the storage tank 6 is pressurized through the evaporator gas line 440 through the compressor 450 and then injected into the lower portion of the storage container 411 to be condensed Whereby the transportation efficiency of the pressurized liquefied natural gas can be improved.

According to the high pressure maintenance system 400 of the pressurized liquefied natural gas storage container according to the present invention, since the evaporator 430 and the compressor 450 can complement each other, the amount of evaporative gas generated in the storage tank 6 The load of the evaporator 430 increases when the pressure in the storage container 411 is not sufficient to maintain the pressure of the storage container 411 and the load of the evaporator 430 decreases when the evaporation gas is sufficient.

FIG. 38 is a configuration diagram showing a separate type liquefier of a heat exchanger according to a thirteenth embodiment of the present invention.

38, the heat exchanger detachable natural gas liquefier 610 according to the thirteenth embodiment of the present invention performs heat exchange with refrigerant by a liquefying heat exchanger 620 made of stainless steel, And the refrigerant is cooled by the refrigerant heat exchangers 631 and 632 made of an aluminum material and supplied to the liquefying heat exchanger 620.

The liquefying heat exchanger 620 is supplied with natural gas through the liquefaction line 623 and is liquefied by heat exchange with the refrigerant. For this purpose, the liquefaction line 623 is connected to the first flow path 621, The line 638 is connected to the second flow path 622 so that the natural gas and the refrigerant passing through the first and second flow paths 621 and 622 respectively exchange heat with each other and the entire part can be made of stainless steel, The liquefied natural gas, such as the first flow path 621, may be in contact with or partially made of stainless steel for parts or parts that need to withstand cryogenic temperatures. Here, the liquefaction line 623 is provided with an on-off valve 624 at the rear end of the first flow path 621.

The refrigerant heat exchangers 631 and 632 may be composed of a plurality of, for example, first and second refrigerant heat exchangers 631 and 632. However, the refrigerant heat exchangers 631 and 632 may be made of a single material, , It may be partly made of aluminum material for parts or parts requiring contact with refrigerant and heat transfer. The refrigerant heat exchangers 631 and 632 may be included in the refrigerant cooling unit 630.

The refrigerant cooling unit 630 supplies the refrigerant to the liquefying heat exchanger 620 by cooling the refrigerant by the first and second refrigerant heat exchangers 631 and 632. For this purpose, The refrigerant is compressed and cooled by the compressor 633 and the after-cooler 634 and the refrigerant which has passed through the after-cooler 634 is separated into the gaseous refrigerant and the liquid refrigerant by the separator 635, The refrigerant is supplied to the first flow path 631a of the first refrigerant heat exchanger 631 and the first flow path 632a of the second refrigerant heat exchanger 632 by the vapor line 638a, Is expanded by the first JT (Joule-Thomson) valve 636a at a low pressure along the connection line 638c via the second flow path 631b of the first refrigerant heat exchanger 631 by the line 638b, Is supplied to the compressor 633 through the third flow path 631c of the first refrigerant heat exchanger 631, and the compression and subsequent steps are repeated .

The refrigerant cooling unit 630 expands the high pressure refrigerant that has passed through the first flow path 632a of the second refrigerant heat exchanger 632 to a low pressure by the second JT valve 636b and supplies the refrigerant to the liquefying heat exchanger 620 of the second refrigerant heat exchanger 632 through the third JT valve 636c through the refrigerant supply line 637 to the first refrigerant heat exchanger 632 and the second refrigerant heat exchanger 632. [ And is supplied to the compressor 633 through the third flow path 631c of the heat exchanger 631 for use.

The aftercooler 634 removes the heat of compression of the refrigerant compressed by the compressor 633 and liquefies a part of the refrigerant. The first refrigerant heat exchanger 631 exchanges the high temperature refrigerant supplied through the first and second flow paths 631a and 631b with the expanded low temperature refrigerant supplied to the third flow path 631c And cooled. The second refrigerant heat exchanger 632 cools the high temperature refrigerant supplied through the first flow path 632a before expansion by heat exchange with the expanded low temperature refrigerant supplied to the second flow path 632b.

In addition, the liquefying heat exchanger 620 is supplied with expanded low-temperature refrigerant through the first and second heat exchangers 631 and 632 and the second J-T valve 636b, thereby cooling and liquefying natural gas.

FIG. 39 is a configuration diagram showing a separate type liquefier of a heat exchanger according to a fourteenth embodiment of the present invention. FIG.

As shown in FIG. 39, the heat exchanger-separated natural gas liquefier 640 according to the fourteenth embodiment of the present invention, like the heat exchanger-separated natural gas liquefier 610 according to the thirteenth embodiment, A liquefying heat exchanger 650 made of stainless steel so as to be liquefied by heat exchange with the refrigerant and a refrigerant heat exchanger 661 made of an aluminum material for the liquefying heat exchanger 650 And a coolant cooling unit 660 for cooling and supplying the cooled natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas liquefied natural gas 610 according to the thirteenth embodiment.

The refrigerant cooling unit 660 compresses and cools the refrigerant discharged from the liquefaction heat exchanger 650 by the compressor 663 and the aftercooler 664 and supplies the refrigerant to the first flow path 661a of the refrigerant heat exchanger 661 The refrigerant that has passed through the first flow path 661a of the refrigerant heat exchanger 661 is expanded by the inflator 665 and supplied to the liquid heat exchanger 650 in accordance with the operation of the flow rate distribution valve 666 And the second flow path 661b of the refrigerant heat exchanger 661 to the compressor 663. [ Here, the flow distribution valve 666 may be a three-way valve as in the present embodiment, or alternatively may be a plurality of bi-directional valves.

The refrigerant heat exchanger 661 is configured to cool the high temperature refrigerant supplied through the first flow path 661a through heat exchange with the expanded low temperature refrigerant supplied through the second flow path 661b. The low-temperature refrigerant is distributed to the refrigerant heat exchanger 661 and the liquefying heat exchanger 650 in accordance with the operation of the flow distribution valve 666. The liquefying heat exchanger 650 is connected to the refrigerant heat exchanger 661 And the inflator 665 to cool the natural gas to liquefy the natural gas.

40 and 41 are a front sectional view and a side sectional view showing a liquefied natural gas storage vessel carrier according to the present invention.

40 and 41, a liquefied natural gas storage vessel cargo ship 700 according to the present invention is a ship for transporting a storage vessel in which liquefied natural gas is stored, and includes a cargo hold 720 provided in the ship 710, And a first and a second upper supporters 730 and 740 which are installed in a plurality of widthwise and lengthwise directions on the upper portion of the carcass 720 to divide the upper portion of the cargo window 720 into a plurality of openings 721, So that the storage container 791 is supported by the first and second upper supporters 730 and 740.

On the other hand, the storage vessel 791 stores a liquefied natural gas, for example, a pressure of 13 to 25 bar and a pressurized liquefied natural gas having a temperature of -120 to -95 DEG C, A double structure or a heat insulating member may be provided, and it may be formed in a tube shape or a cylinder shape, and may have various other shapes.

The hold 720 may be provided so as to open at an upper portion to the hull 710. In this case, the hull 710 can be utilized as a hull of the container line. Accordingly, the time required for manufacturing the liquefied natural gas storage vessel transportation line 700 can be reduced.

42, the first and second upper supports 730 and 740 are installed at the upper part of the cargo hold 720 in the width direction and the longitudinal direction so that the upper part of the cargo hold 720 is divided into a plurality of openings 721 And the storage container 791 is vertically inserted and supported for each opening 721. That is, the first upper support 730 is installed at the upper part of the cargo hold 720 in the width direction of the hull 710, and is installed at a plurality of intervals along the longitudinal direction of the hull 710. The second upper support 740 is installed on the upper portion of the cargo hold 720 in the longitudinal direction of the hull 710 and is installed at a plurality of intervals along the width direction of the hull 710. The first and second upper supports 730 and 740 may have a plurality of openings 721 in the horizontal and vertical directions at the upper portion of the cargo hold 720 and may be fixed to the upper end of the cargo hold 720 by welding, It can be fixed with a fastening member such as a bolt.

In addition, a plurality of support blocks 760 for supporting the sides of the storage container 791 may be installed on the first and second upper supports 730 and 740 and a part or all of the inner surfaces of the hold 720. The support block 760 may be provided to support the storage container 791 in front and rear, left and right, respectively, and may support the storage container 791 with a curvature corresponding to the outer curvature of the storage container 791, A surface 761 may be formed.

The lower support platform 750 is installed at the bottom of the cargo hold 720 and supports the lower portion of the storage container 791 inserted into the opening 721. The lower support platform 750 is installed on the bottom surface of the cargo hold 720 vertically upward And a reinforcing member 751 for maintaining a gap therebetween may be further provided. The lower supports 750 and the reinforcing members 751 may be formed as one set for each of the storage vessels 791. The plurality of storage vessels 791 ) Of the lower surface of the base plate.

The liquefied natural gas storage vessel carrier 700 according to the present invention can be used as a stanchion, a lashing bridge or the like in the case of a container line for supporting the storage container 791, The second upper supports 730 and 740 may be fixedly supported on the stanchion cloth and the lashing bridge.

Therefore, the conventional container line can be modified to enable the container 791 to be transported with a small change, and the container loading unit 791 can be modified to accommodate the container loading unit 791 on the deck 711 to transport the container box 792 together with the storage container 791. [ (770) may be additionally provided.

43 is a configuration diagram showing a carbon dioxide solidification elimination system according to the present invention.

43, the carbon dioxide solidification elimination system 810 according to the present invention includes an expansion valve 812 for reducing the pressure of high-pressure natural gas to a low pressure, an evaporator 812 installed at the rear end of the expansion valve 812, And a heating unit 816 for evaporating the solidified carbon dioxide of the expansion valve 812 and the solidified carbon dioxide filter 813. The solidified carbon dioxide filter 813 is a solidified carbon dioxide filter for filtering the solidified carbon dioxide contained in the solidified carbon dioxide The carbon dioxide is solidified from the natural gas liquefied by the filter 813 and the heat is supplied from the heating unit 816 in a state where supply of the natural gas to the expansion valve 812 and the solidification carbon dioxide filter 813 is stopped. So that the solidified carbon dioxide can be regenerated and removed.

The expansion valve 812 is installed in a supply line 811 to which high-pressure natural gas is supplied, and lowers the high-pressure natural gas supplied through the supply line 811 to a low pressure to liquefy it.

The solidified carbon dioxide filter 813 is installed at the downstream side of the expansion valve 812 in the supply line 811 and filters frozen and solidified carbon dioxide from the liquefied natural gas supplied from the expansion valve 812 to remove carbon dioxide solids A filter member for filtering is provided inside.

The expansion valve 812 and the solidified carbon dioxide filter 813 are opened and closed by the first and second open / close valves 814 and 815 for the supply of the high-pressure natural gas and the discharge of the low-pressure liquefied natural gas. The open / close valves 814 and 815 are installed in the supply line 811 at the front end of the expansion valve 812 and at the rear end of the solidified carbon dioxide filter 813, respectively, to open and close the flow of the natural gas. The first on-off valve 814 opens and closes the high-pressure natural gas supply to the expansion valve 812 and the second on-off valve 815 opens and closes the discharge of the low-pressure liquefied natural gas discharged from the solidified carbon dioxide filter 813 .

The heating section 816 provides heat to vaporize the solidified carbon dioxide of the expansion valve 812 and the solidified carbon dioxide filter 813. For example, And fourth and fifth open / close valves 816c and 816b installed at the front and rear ends of the regenerative heat exchanger 816b in the heat transfer line 816a, respectively, and the regenerative heat exchanger 816b installed in the heat transfer line 816a, 816d.

A third open / close valve 817 is provided in a discharge line 817a through which carbon dioxide is discharged so as to discharge the carbon dioxide regenerated by the heating unit 816 to the outside.

The third on-off valve 817 discharges the carbon dioxide regenerated by the heating unit 816 to the discharge line 817a branched from the supply line 811 between the first on-off valve 814 and the expansion valve 812 And is opened and closed.

In addition, the carbon dioxide desalination system 810 according to the present invention includes a plurality of carbon dioxide desalination systems 810, and a plurality of first to third open / close valves 814, 815, and 817 and a heating unit 816 In this embodiment, two filters are used to perform filtering and regeneration of carbon dioxide, respectively. Operations for this operation will now be described with reference to the accompanying drawings.

As shown in FIG. 44, the carbon dioxide solidification elimination system 810 according to the present invention will be described with reference to any one of them. First, by opening the first and second open / close valves 814 and 815, When the high-pressure natural gas is supplied to the expansion valve 812 and is expanded at low pressure, the natural gas is cooled and low-pressure liquefied natural gas is supplied to the solidified carbon dioxide filter 813. The solidified carbon dioxide contained in the liquefied natural gas by cooling And is filtered by the carbon dioxide filter 813. When solidified carbon dioxide is continuously accumulated in the solidified carbon dioxide filter 813, the supply of high-pressure natural gas through the supply line 811 is stopped by closing the first and second open / close valves 814 and 815, 5 opening and closing valves 816c and 816d to circulate and supply the heat to the regenerating heat exchanger 816b to supply heat to the expansion valve 812 and the solidified carbon dioxide filter 813 to regenerate the solidified carbon dioxide by vaporizing it.

The regenerated carbon dioxide is removed by being discharged to the outside along the discharge line 817a by opening the third opening and closing valve 817. [

In the case where the carbon dioxide desalination system 810 according to the present invention is composed of a plurality of, for example, two, the first to fifth open / close valves 814, 815, 817, 816c, and 816d are provided so as to perform solidified carbon dioxide filtering from natural gas. And the other (II) performs a contrary operation to perform regeneration through vaporization of the solidified carbon dioxide.

As described above, the carbon dioxide desalination system 810 according to the present invention employs a low-temperature system for separating and solidifying carbon dioxide in the carbon dioxide removal system, thereby making it possible to combine with the natural gas liquefaction process. In this case, the removal process of the pretreatment carbon dioxide is not necessary, and accordingly the facility is reduced. When the natural gas fed to the high pressure is liquefied and carbon dioxide solidifies upon expansion and decompression at a low pressure by the expansion valve 812, the solidified carbon dioxide is filtered by a solidified carbon dioxide filter 813, which is a mechanical filter, When the carbon dioxide is continuously accumulated in the solidified carbon dioxide filter 813, the plurality of solidified carbon dioxide filters 813 can be used alternately and at the same time, the regeneration of the carbon dioxide can be made possible.

45 is a cross-sectional view illustrating a connection structure of a liquefied natural gas storage container according to the present invention.

45, a connection structure 820 of a liquefied natural gas storage container according to the present invention includes an inner shell 831 and an outer injection portion 840 of a liquefied natural gas storage container 830 having a double structure The inner shell 831 and the outer injecting unit 840 are slidingly coupled to each other. For this purpose, the inner shell 831 and the outer injecting unit 840 may include a sliding coupling unit 821.

The sliding engagement portion 821 is provided at a connection portion between the inner shell 831 and the outer injection portion 840 and is provided with a sliding engagement portion 821 by thermal shrinkage or thermal expansion so as to buffer heat shrinkage or thermal expansion of the inner shell 831 or the outer shell 832 The connection portion of the inner shell 831 and the outer injection portion 840 may be slidable along the direction in which the displacement occurs.

The outer shell 832 surrounds the outer side of the inner shell 831 and the outer shell 832 surrounds the inner shell 831 and the outer shell 831. In this case, 832 may be provided with a heat insulating layer 833 which reduces the temperature effect.

Here, the inner shell 831 may be made of a metal having excellent low-temperature characteristics such as a low-temperature resistant metal of a liquefied natural gas, for example, aluminum, stainless steel, and 5 to 9% nickel steel.

The storage container 830 may be made of a steel material to withstand the internal pressure of the outer shell 832 as in the previous embodiments and the inside of the inner shell 831 and the heat insulating layer 833 are located The pressure of the inside of the inner shell and the pressure of the heat insulating layer can be equalized or approximated by the connecting flow path connecting the inner shell and the heat insulating layer.

This causes the pressure of the pressurized liquefied natural gas inside the inner shell to be sustained by the outer shell so that the inner shell can be made to withstand temperatures of -120 to -95 DEG C, ~ 25 bar) and pressurized liquefied natural gas with temperature conditions, for example a pressure of 17 bar and a temperature of -115 ° C.

Also, the storage container 830 may be designed to satisfy the above-described pressure and temperature conditions in a state where the outer shell and the insulating layer are assembled.

The sliding engagement portion 821 includes a connection portion 822 extending outward from an injection port 831a formed for injection and discharge of liquefied natural gas into the inner shell 831 and a coupling portion 822 projecting from the external injection portion 840 823 are slidingly coupled with each other by a fitting method.

46, the connecting portion 822 and the engaging portion 823 are formed as a circular tube so that one of them can be inserted into the other and slidably coupled. However, Can be slidingly combined by forming cross-sectional shapes corresponding to each other.

The connection structure 820 of the liquefied natural gas storage container according to the present invention may further include an extension portion 824 extending from the outer shell 832 to extend the sliding engagement portion 821. [ Therefore, the sliding engagement portion 821 is exposed to the outside by the extension portion 824, thereby being prevented from being affected by the external environment. The extension portion 824 may be flanged to the external injection portion 840 by forming a flange at the end of the extension portion 824 so that the storage container 830 can be stably coupled to the external injection portion 840.

The coupling portion 823 provided in the external injection portion 840 may be integrally formed with the external injection portion 840 as in the present embodiment and may be formed as a separate member from the external injection portion 840, May be fixed to the extension portion 824, and may be coupled to the external injection portion 840 by flange connection or by various methods.

47, the connection structure 820 of the liquefied natural gas storage container according to the present invention is designed such that even if a load is concentrated at the connection portion between the inner shell 831 and the external injection portion 840 due to heat shrinkage or thermal expansion The connecting portion 822 and the engaging portion 823 can slide relative to each other to buffer heat shrinkage or thermal expansion to prevent the load from concentrating on the inner shell 831 and the outer injecting portion 840, Thereby preventing damage to the apparatus.

Since the natural gas in the storage container 830 can move to the heat insulating layer 833 through the clearance of the sliding engaging portion 821, the pressure of the heat insulating layer 833 and the pressure of the inner shell 831 are the same , And this can have the effect of replacing the equalizing line for holding the equivalent pressure of the insulating shell and the inner shell as shown in Figs. 23 to 25 as well.

FIG. 48 is a view schematically showing a storage vessel for liquefied natural gas according to the present invention, FIG. 49 is a view schematically showing the structure of a shell inside the storage vessel of a liquefied natural gas according to the present invention, FIG. 51 is a view showing various forms of the structure of the internal shell of the liquefied natural gas storage vessel according to the present invention, and FIG. 52 FIG. 53 is a view schematically showing the structure of the internal shell of the storage vessel of the liquefied natural gas according to the present invention, and FIG. 53 is a view schematically showing the storage vessel of the liquefied natural gas according to the present invention.

48 to 52, the liquefied natural gas storage container 900 includes an inner shell 910, an outer shell 920, a support 930, and a heat insulating layer 940 .

The storage vessel 900 of the present invention has an inner shell 910 and an outer shell 920 between an inner shell 910 in which liquefied natural gas is stored and an outer shell 920 surrounding the outer side of the inner shell 910. [ And a heat insulating layer portion 940 for reducing heat transfer.

In order to supply and discharge the liquefied natural gas to the inner shell 910, a connecting portion (not shown) may be integrally connected to the entrance and exit of the inner shell 910 to protrude outside the outer shell 920, An external member such as a valve may be connected to the connection portion.

The inner shell 910, as shown in FIG. (Or tubular) with wrinkle structure 950, but may have various shapes, including other polyhedrons.

The wrinkle structure 950 formed in the inner shell 910 may have various bent portions 952 depending on the sectional shape of the wrinkles and may have at least one wrinkle 951 having various bent portions 952.

The at least one wrinkle 951 may determine the bending angle 953, the wrinkle depth 954 and the wrinkle distance 955 so as to have the same shape throughout one inner shell 910 the bending angle 953, the wrinkle depth 954, and the wrinkle distance 955 may be determined so that some of them have different shapes or the whole shape is different from each other.

The various bent portions 952 may have various shapes such as an angled corner bent portion 9521, a rounded corner bent portion 9522, and a wavy bent portion 9523.

50 (a) shows an inner shell 910 which is formed such that four corner bent portions 9521 are formed in one wrinkle 951, and a bent angle 953 of the angled corner bent portion 9521 is shown. It is possible to make wrinkles of various shapes.

50 (b) and (c) illustrate an inner shell 910 in which one or more wrinkles 951 are formed to have different wrinkle depth 954 and wrinkle 955 from each other, The corner portions are rounded so as not to have angled corners so as to have rounded corner bent portions 9522. [

51 (a) and 51 (b), each of the at least one wrinkles 951 has an inner shell 910 formed to have a wrinkle depth 954 and a wrinkle distance 955 different from each other, (951) has an inner shell (910) having a wavy bend (9523) with a wavy bend.

52 (a) and 52 (b), bent portions 9521 and 9522 having angled corners or rounded corners and a wavy bent portion 9523 may be formed as one wrinkle .

48 and 49, the wrinkle structure 950 is formed on the side surface of the outer surface of the inner shell 910. The wrinkle structure 950 may be formed on the side surface as well as the side surface of the upper lid 960 or the lower lid 970, Lt; / RTI >

The inner shell 910 forms a space for storing the liquefied natural gas therein and has a low temperature characteristic such as a metal capable of withstanding the low temperature of the liquefied natural gas, for example, aluminum, stainless steel, 5-9% It can be made of excellent metal.

The outer shell 920 may be made of a steel material to wrap the outer side of the inner shell 910 to withstand the inner pressure to form a space with the inner shell 910, By sharing the internal pressure applied, the amount of material used for the inner shell 910 can be reduced, thereby reducing manufacturing costs.

The heat insulating layer portion 940 is formed of a heat insulating material that is installed in a space between the inner shell 910 and the outer shell 920 and reduces heat transfer.

The heat insulation layer portion 940 may be designed to apply the same pressure as the pressure in the inner shell 910. Here, the same pressure as the pressure in the inner shell 910 does not mean strictly the same, .

The inside of the insulating layer portion 940 and the inner shell 910 may be connected to each other by the connecting flow path 54 (shown in Fig. 12) as in the previous embodiment for pressure balance between the inside and the outside of the inner shell 910, Since the connection passage 54 has been described in detail in the previous embodiment, the description thereof will be omitted.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell since the pressure of the inner shell and the pressure of the heat insulating layer is equal or approximated by the connecting passage 54 by the inner shell 910. Thus, even though the inner shell 910 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13-25 bar) and the temperature conditions described above by the inner shell and the outer shell, And the outer shell 920, the support 930 and the insulating layer 940 may be designed to satisfy the above-mentioned pressure and temperature conditions in the assembled state.

The support 930 can be installed to have the same manner and function as those described in the other embodiments, so that detailed description thereof will be omitted. In the same manner as in the other embodiments described above, the support 930 is provided between the inner shell 910 and the outer shell 920 A lower support 931 may be additionally provided in the space.

As shown in FIG. 53, the liquefied natural gas storage vessel 900 according to the present invention can also be installed in the lateral direction, in which case the lower support 931 can be omitted.

A method of manufacturing a liquefied natural gas storage container 900 according to an embodiment of the present invention shown in FIGS. The outer shell 920 is disposed outside the storage container and the inner shell 910 and the outer shell 920 supporting the outer shell 910 are disposed inside the storage container, Is installed in the space between the inner shell 910 and the outer shell 920 and the heat insulating layer 940 for reducing the heat transfer is installed in the space between the inner shell 910 and the outer shell 920.

At this time, the corrugated structure of the inner shell 910 can be manufactured by forming a plurality of curved surfaces by using a roller and connecting them by welding.

The rollers for making the corrugated structure include all kinds of rollers capable of forming a corrugated structure (corrugated or curved surface) such as a corrugated roller as well as a general roller, After the wrinkles are formed, the joints are jointed by welding to form a storage container 900 for liquefied natural gas.

The components and functions of the parts constituting the storage container manufactured in this manner are the same as those described above, and thus a detailed description thereof will be omitted.

FIG. 54 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention, and FIGS. 55 to 57 are views schematically showing a protruding support of a liquefied natural gas storage container according to the present invention. Is a plan view, FIG. 58 (b) is a side view, and FIG. 58 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention.

The liquefied natural gas storage container according to the present invention is supported by connecting the hinge to the support points of the inner shell and the outer shell in place of the volume type support system in which the conventional inner shell is supported.

54 to 58, the liquefied natural gas storage container 1000 includes an inner shell 1010, an outer shell 1020, a hinge support 1030, and a heat insulation layer 1050. The liquefied natural gas storage container 1000 shown in Figs.

The inner shell 1010 stores therein the liquefied natural gas and the outer shell 1020 surrounds the outer side of the inner shell 1010 so as to form a space with the inner shell 1010, And is installed in a space between the inner shell 1010 and the outer shell 1020 to reduce heat transfer.

In order to supply and discharge the liquefied natural gas to the inner shell 1010, a connecting portion (not shown) may be integrally connected to the entrance of the inner shell 1010 to protrude outside the outer shell 1020, An external member such as a valve may be connected to the connection portion.

The hinge support 1030 is installed in a space between the inner shell 1010 and the outer shell 1020 so as to support the inner shell 1010 and the outer shell 1020 in a hinged manner, And the circumferential direction, and FIG. 54 shows a plurality of them in the longitudinal direction.

The hinge support 1030 is installed in the space between the inner shell 1010 and the outer shell 1020 so as to support the inner shell 1010 and the outer shell 1020 so that the inner shell 1010 and the outer shell 1020 can be structurally And may be made of metal (for example, low-temperature steel) to withstand the low temperature of the liquefied natural gas and may be installed at a plurality of intervals along the circumference of the inner shell 1010 and the outer shell 1020, And they may be installed in a plurality of spaces spaced up and down on the circumference of the side portion and on the upper and lower sides.

The hinge support 1030 may be fixedly welded to the outer surface of the inner shell 1010 and the inner surface of the outer shell 1020. At this time, in order to prevent heat from being transmitted to the outside through the support, a heat insulating material such as glass fiber is inserted into the support, or a separate heat insulating member is disposed between the outside of the support and the inside of the outer shell, And may be prevented from being transmitted to the outer shell 1020 by the hinge support 1030.

The hinge support 1030 may include at least one hinge rod 1033, at least one hinge lug 1032, and a hinge pin 1031.

The hinge rod 1033 connects the inner shell 1010 and the outer shell 1020 with hinge pins 1031 at both ends of the hinge rod 1033. The hinge lugs 1032 are connected to the hinge rods 1033, The inner shell 1010 and the outer shell 1020 can be hinged to each other by the hinge pin 1031 so as to insert the pin 1031 into the inner shell 1010 and the outer shell 1020, respectively.

Since the inner shell 1010 and the outer shell 1031 are connected by the hinge structure, the hinge structure can absorb heat shrinkage or thermal expansion of the inner shell 1010 due to the temperature change.

Accordingly, since the hinge structure can absorb the stress due to the thermal change that may occur in the support, and the load concentration can be absorbed, the damage of the support due to stress concentration can be prevented, Durability can be increased.

The hinge pin insertion hole 1034 formed in the hinge lug 1032 can form a space in the horizontal direction so that the inserted hinge pin 1031 can move in the horizontal direction.

This is to allow the space in the horizontal direction to receive and support the movement of the inner shell 1010 caused by heat shrinkage or thermal expansion, thereby relieving the stress that may occur in the hinge support 1030.

The hinge support 1030 is configured to allow the hinge lug 1032 to support the vertical load of the inner shell 1010 and outer shell 1020 evenly as shown in Figures 55-57. The horizontal projection plane may be formed such that the left and right sides are symmetrical with respect to the radial center line 1035 of the storage container 1000.

This is to prevent an unbalanced vertical load from being applied to the hinge lug 1032 because an unnecessary rotational force acts on the hinge lug 1032 to increase the possibility of damage to the hinge lug 1032.

55, the hinge rod 1033 is provided so as to be inclined with respect to the horizontal direction, and the hinge rod 1033 is inclined so that the inner shell 1010 is thermally shrunk The thermal expansion can be absorbed by the rotation of the hinge rod 1033.

If two hinge rods 1033 are provided, as shown in FIG. 56, one of them may have a slope in the upper right room and the other one may have a slope in the lower right room. As shown in FIG. 57, , And may have portions bent in opposite directions at opposite positions.

This is because the horizontal projection plane of the hinge support 1030 is symmetric about the radial center line 1035 to distribute the vertical load evenly distributed to the hinge lugs 1032 while the left and right sides are symmetric with respect to the radial center line 1035 to absorb the thermal shrinkage or thermal expansion of the inner shell 1010 In order to make it possible.

The inner shell 1010 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperature of the liquefied natural gas such as aluminum, stainless steel, 5-9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 1020 may be made of a steel material to wrap the outer side of the inner shell 1010 to withstand the inner pressure to form a space with the inner shell 1010, By sharing the internal pressure applied, the amount of material used for the inner shell 1010 can be reduced, thereby reducing manufacturing costs.

The insulating layer portion 1050 is formed of a heat insulating material that is installed in a space between the inner shell 1010 and the outer shell 1020 and reduces heat transfer.

The insulation layer portion 1050 may be designed to apply the same pressure as the pressure in the inner shell 1010. Here, the same pressure as the pressure in the inner shell 1010 does not mean strictly the same, .

The interior of the insulating layer portion 1050 and the inner shell 1010 may be connected to each other by a connecting flow path 54 (shown in Fig. 12) as in the previous embodiment for pressure balance between the inside and the outside of the inner shell 1010, Since the connection flow path has been described in detail in the previous embodiment, the description thereof will be omitted.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell because the inner shell 1010 has the same or approximate pressure of the inner shell and the heat insulating layer by the connecting flow path. Thus, even though the inner shell 1010 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13-25 bar) and the temperature conditions described above by the inner shell and the outer shell, And may be designed to satisfy the above-described pressure and temperature conditions in the state where the outer shell 1020, the protruding support 1030, and the insulating layer portion 1050 are assembled .

The liquefied natural gas storage vessel 1000 according to the present invention includes an inner shell 1010 and a lower support 1040 installed in a lower space between the inner shell 1010 and the outer shell 1020 to support the outer shell 1020. [ In order to prevent the heat from being transmitted to the outside through the support as described in the hinge support 1030, a heat insulating material such as glass fiber may be inserted into the support, It is possible to prevent the temperature of the inner shell 1010 from being transmitted to the outer shell 1020 by the lower support 1040. [

58, the liquefied natural gas storage container 1000 according to the present invention may be installed in the lateral direction. In addition to the protrusion support 1030 as in the case of installing the liquefied natural gas storage container 1000 in the longitudinal direction, Can be installed.

FIG. 59 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention, FIG. 60 is an enlarged view of a portion A in FIG. 59, (a) 61 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention, wherein (a) is a view in which two lower support rods are installed, and Fig. 61 (b) (b) is a cross-sectional view showing a cross section, and FIG. 62 is a view schematically showing the structure of a liquefied natural gas storage container according to the present invention.

The liquefied natural gas storage container according to the present invention supports the inner shell in a sliding manner by the separated protruding member so as to have a sloped cross-section instead of a bulky-type support system in which the inner shell is conventionally supported.

The liquefied natural gas storage container 1100 shown in Figs. 59 to 62 includes an inner shell 1110, an outer shell 1120, a protrusion support 1130, and a heat insulating layer 1150.

The inner shell 1110 stores liquefied natural gas inside and the outer shell 1120 surrounds the outer side of the inner shell 1110 to form a space with the inner shell 1110, And is installed in a space between the inner shell 1110 and the outer shell 1120 to reduce heat transfer.

A connecting portion (not shown) may be integrally connected to the inlet and outlet of the inner shell 1110 to supply and discharge the liquefied natural gas to the inner shell 1110 and may protrude outside the outer shell 1120. An external member such as a valve may be connected to the connection portion.

The protruding support 1130 is installed in a space between the inner shell 1110 and the outer shell 1120 so as to connect and support the inner shell 1110 and the outer shell 1120 with the separated protruding members so as to have a sloped cross section, As shown in FIG. 61, a plurality of storage containers 1100 may be provided at intervals in any one or more of the longitudinal direction and the circumferential direction. In FIG. 59, a plurality of the storage containers 1100 are provided in the longitudinal direction. b are provided in the circumferential direction.

Since the inner shell 1110 and the outer shell 1120 are connected to each other by the protruding support 1130 having a sloped cross section, the thermal expansion or thermal expansion of the inner shell 1110 due to the temperature change can be prevented, So that it can be absorbed while sliding.

Therefore, since the projecting support 1130 can absorb the stress that may occur in the support due to thermal shrinkage or thermal expansion of the inner shell 1110, and also the concentrated load can be absorbed, the damage of the support due to stress concentration can be prevented The structural stability and durability of the storage container 1000 can be improved.

As shown in FIG. 61, the protruding supports 1130 may be spaced apart at regular intervals in the circumferential direction. In this case, since the load or the stress distribution is uniformly applied to the protruding supports 1130, the durability of the protruding supports 1130 .

The protruding support 1130 is installed in the space between the inner shell 1110 and the outer shell 1120 to support the inner shell 1110 and the outer shell 1120 so that the inner shell 1110 and the outer shell 1120 are structurally And may be made of metal (for example, low-temperature steel) to withstand the low temperature of the liquefied natural gas and may be installed at a plurality of intervals along the side edges of the inner shell 1110 and the outer shell 1120, And they may be installed in a plurality of spaces spaced up and down on the circumference of the side portion and on the upper and lower sides.

The protruding support 1130 may be welded and fixed to the outer surface of the inner shell 1110 and the inner surface of the outer shell 1120. At this time, in order to prevent the heat from being transmitted to the outside through the support, a heat insulating material such as glass fiber is inserted into the support, or a separate heat insulating member is disposed between the outside of the support and the inside of the outer shell so that the temperature of the inner shell 1110 And may be prevented from being transmitted to the outer shell 1120 by the protruding support 1130. [

The protrusion support 1130 may include a lower support block 1131, an upper support block 1132, and a sliding member 133.

The lower support block 1131 has a sloped upper end face and the upper support block 1132 has a sloped lower end face and a lower end face of the upper support block 1132 moves on the upper end face of the lower support block 1131 .

Since the outer shell 1120 can support the thermal expansion and the thermal contraction of the inner shell 1110 according to the temperature change of the inner shell 1110, the lower support block 1131 located at the lower one of the inclined support blocks, The upper support block 1132 located at the upper portion is attached to the inner shell 1120 and the inner shell 1110 is attached to the inner shell 1110 to the lower end face of the upper support block 1132 attached to the inner shell 1110 And can be supported while moving on the upper end surface of the lower support block 1131 attached to the outer shell 1120.

At this time, a plurality of grooves may be formed on the upper end surface of the lower support block 1131 or the lower end surface of the upper support block 1132 so that the upper support block 1132 can move the lower support block 1131 smoothly.

As a result, when the upper support block 1132 moves on the lower support block 1131, the frictional force is reduced due to the reduction of the frictional surface, and stress concentration in the structure of the storage container due to frictional force or wear between the support blocks 1131 and 1132 . ≪ / RTI >

Further, the sliding member 1133 may be further added to either the upper end surface of the lower support block 1131 or the lower end surface of the upper support block 1132.

The sliding member 1133 also moves the upper support block 1132 smoothly on the lower support block 1131 to prevent the generation of frictional force or concentration of stress so that the stress concentration of the storage container structure or the stress concentration of the support blocks 1131 and 1132 And the durability of the storage container is increased.

As the sliding member 1133, a spring, a roller, or the like may be used. However, the sliding member 1133 is not necessarily limited to the sliding member 1133. The sliding member 1133 may include any device that allows the upper support block to smoothly move on the lower support block with a small frictional force.

As shown in Figure 60 (a), if a spring is used as the sliding member 1133, when the inner shell 1110 is thermally expanded, the elastic force of the spring causes the upper support block 1132 to be in contact with the lower support block 1131 So that the stress concentration due to thermal expansion can be further mitigated.

 FIG. 60 (b) shows a state in which the inner shell 1110 is lowered to the lower portion of the lower support block 1131 by heat shrinkage.

The inner shell 1110 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperature of the liquefied natural gas such as aluminum, stainless steel, 5-9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 1120 may be made of a steel material to wrap the outer side of the inner shell 1110 to withstand the inner pressure so as to form a space with the inner shell 1110, The amount of material used for the inner shell 1110 can be reduced by sharing the applied internal pressure, thereby reducing manufacturing costs.

The heat insulating layer 1150 is provided in a space between the inner shell 1110 and the outer shell 1120 and is made of a heat insulating material that reduces heat transfer.

The insulation layer portion 1150 may be designed such that the same pressure as the pressure in the inner shell 1110 is applied, wherein the same pressure as the pressure in the inner shell 1110 does not mean strictly the same, .

The inside of the insulating layer portion 1150 and the inner shell 1110 may be connected to each other by a connecting passage 54 (shown in Fig. 12) as in the previous embodiment for pressure balance between the inside and the outside of the inner shell 1110, Since the connection flow path has been described in detail in the previous embodiment, the description thereof will be omitted.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell because the inner shell 1110 has the same or approximate pressure of the inner shell and the heat insulating layer due to the connecting flow channel. Thus, even though the inner shell 1110 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13-25 bar) and the temperature conditions described above by the inner shell and the outer shell, And may be designed to satisfy the above-described pressure and temperature conditions in a state where the outer shell 1120, the protruding support 1130, and the insulating layer 1150 are assembled .

The liquefied natural gas storage container 1100 according to the present invention includes an inner shell 1110 and a lower support 1140 installed in a lower space between the inner shell 1110 and the outer shell 1120 to support the outer shell 1120. [ As described with reference to the hinge support 1130, a heat insulating material such as glass fiber may be inserted into the support to prevent heat from being transmitted to the outside through the support, or a separate heat insulating member may be attached to the outside of the support and the outer shell It is possible to prevent the temperature of the inner shell 1110 from being transmitted to the outer shell 1120 by the lower supporter 1140.

61 (a), the load applied to the lower support 1140 is dispersed, so that the durability of the lower support 1140 can be improved .

62, the liquefied natural gas storage container 1100 according to the present invention may be installed in the lateral direction. In addition to the protruding support 1130, Can be installed.

63 and 64 are a plan sectional view schematically showing a lateral cross section of a liquefied natural gas storage container according to the present invention and Fig. 65 is a side view showing a part of a longitudinal section of a liquefied natural gas storage container according to the present invention Sectional view.

The structure of the liquefied natural gas storage vessel according to the present invention shown in Figs. 63 to 65 includes an inner shell 1210, an outer shell 1220, a thermal insulation layer 1240, and a thermal deformation support structure 1230.

As described in other embodiments, the inner shell 1210 stores liquefied natural gas inside, and the outer shell 1220 is configured to house the outer side of the inner shell 1210 to define a space between the inner shell 1210 and the inner shell 1210. [ And the heat insulating layer 1240 is installed in a space between the inner shell 1210 and the outer shell 1220 to reduce heat transfer.

Meanwhile, a connecting portion (not shown) may be integrally connected to the inlet and outlet of the inner shell 1210 for supplying and discharging the liquefied natural gas to the inner shell 1210 and may be protruded to the outside of the outer shell 1220, An external member such as a valve may be connected to the connection portion.

The thermal deformation support structure 1230 is installed in a space between the inner shell 1210 and the outer shell 1220 and uses thermal deformation due to a temperature difference between the inner shell 1210 side portion and the outer shell 1220 side portion And supports the inner shell 1210 and the outer shell 1220.

The thermal deformation support structure 1230 is installed such that the surface contracted by the low temperature is directed to the inner shell 1210 side. When the inner shell 1210 is in a state in which the liquefied natural gas is not filled with low temperature, The shape of the support structure 1230 may take the form as shown in Figures 63 (a) and 64 (a).

When the liquefied natural gas at low temperature is filled in the inner shell 1210 of the storage container 1200, the thermal deformation support structure 1230 is deformed by the inner shell 1210, as shown in Figs. 63B and 64B, The inner shell 1210 and the outer shell 1220 are shrunk to contact the outer surface of the inner shell 1210 and the inner surface of the outer shell 1220 to support the inner shell 1210 and the outer shell 1220. [

The lateral thickness t of the thermal deformation support structure 1230 should be less than the lateral distance T of the space between the inner shell 1210 and the outer shell 1220 because the support structure 1230 has a low temperature portion The supporting structure 1230 is formed by the inner shell 1210 and the outer shell 1220 in a displacement due to heat shrinkage in the space, .

64 (a), the thermal deformation support structure 1230 may be made of a reinforced plastic or a bimetal or a combination of both. In this case as well, the total deformation support structure 1230 may have a total thickness (t = t1 + t2) should be less than the transverse distance T of the space between the inner shell 1210 and the outer shell 1220. [

The thermal deformation support structure 1230 can be made in various sizes and shapes and can be made to have the same curvature as the outer shell 1220 of the storage vessel, as shown in Figures 63 and 64, And should be large enough to support the inner shell 1210 and the outer shell 1220.

One such thermal deformation support structure may be provided in a space between the inner shell 1210 and the outer shell 1220, or may be divided into a plurality of locations and installed at a plurality of locations. If the thermal deformation support structure is installed large in the height direction The radial support of the inner shell 1210 and the outer shell 1220 as well as the support in the height direction can be achieved to some extent.

The structure of the liquefied natural gas storage container according to the present invention may further include a height direction support structure 1233.

The elevation support structure 1233 is configured to protrude toward the space between the outer side of the inner shell 1210 and the inner side of the outer shell 1220 as shown in Figure 65, And a plurality of thermal deformation support structures 1230 may be installed in the height direction so as to be installed between a plurality of intervals formed by the vertical support structures 1233.

The spaced apart height support structures 1233 can support the inner shell 1210 and the outer shell 1220 in the height direction by allowing the thermal deformation support structure 1230 to be disposed between the spaces, Only the structure 1230 is installed to complement the function of supporting the inner shell 1210 and the outer shell 1220 in the height direction.

The inner shell 1210 forms a space for storing the liquefied natural gas inside and is made of a metal that is resistant to low temperatures of liquefied natural gas such as aluminum, stainless steel, 5 to 9% nickel steel, And may be formed in a tube shape as in the present embodiment, or may have various shapes including other polyhedrons.

The outer shell 1220 may be made of a steel material to wrap the outer side of the inner shell 1210 to withstand the inner pressure to form a space with the inner shell 1210, By sharing the internal pressure applied, the amount of material used for the inner shell 1210 can be reduced, thereby reducing manufacturing costs.

The heat insulating layer 1240 may be made of a heat insulating material that is installed in a space between the inner shell 1210 and the outer shell 1220 and reduces heat transfer.

The insulation layer portion 1240 may be designed to apply the same pressure as the pressure in the inner shell 1210 wherein the same pressure as the pressure in the inner shell 1210 does not mean exactly the same, .

The inside of the insulating layer portion 1240 and the inner shell 1210 can be connected to each other by the connecting flow path 54 (shown in Fig. 12) as in the previous embodiment for the pressure balance between the inside and the outside of the inner shell 1210, Since the connection flow path has been described in detail in the previous embodiment, the description thereof will be omitted.

The pressure of the pressurized liquefied natural gas can be sustained by the outer shell 1220 since the inner shell 1210 has the same or approximate pressure of the inner shell and the heat insulating layer due to the connecting flow path. Thus, even though the inner shell 1210 is manufactured to withstand a temperature of -120 to -95 占 폚, the pressure (13-25 bar) and the temperature conditions described above by the inner shell and the outer shell, And is designed to satisfy the above-described pressure and temperature conditions in a state where the outer shell 1220, the strain-deforming support structure 1230, and the insulation layer portion 1240 are assembled It is possible.

The liquefied natural gas storage container 1200 according to the present invention is provided with a lower space between the inner shell 1210 and the outer shell 1220 so as to more fully support the inner shell 1210 and the outer shell 1220 in the height direction, (Not shown) may be further installed on the lower support. In order to prevent the heat from being transmitted to the outside through the lower support, a heat insulating material such as glass fiber is inserted into the support, or a separate heat insulating member is provided between the outside of the support and the inside of the outer shell The temperature of the inner shell 1210 can be prevented from being transmitted to the outer shell 1220 by the lower support.

In this case, since the load received by the lower support is dispersed, the durability of the lower support can be improved.

The liquefied natural gas storage container 1100 according to the present invention may be installed in the lateral direction, and the lower support may be additionally provided as in the case of installing the liquefied natural gas storage container 1100 in the longitudinal direction.

The structure of the storage vessel for liquefied natural gas according to the present invention includes an inner shell 1210 for storing liquefied natural gas inside and an outer shell 1220 for enclosing an outer side of the inner shell 1210 in space, And a member of a thermally deformable material may be inserted into the space to support the inner shell 1210 and the outer shell 1220 by thermal deformation.

In this case, the thickness t of the thermally deformable material may be smaller than the lateral distance T between the inner shell 1210 and the inner shell 1220, The detailed description is omitted, but it goes without saying that the configurations described in the above description can be added.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

1: Natural gas field 2: Vessel
3: consumer 3: consumer
4: Valve 5: Seal
6: Storage tank 7:
7a: valve 8: unloading line
8a: Valve 9a: External injection part
10: Pressurized liquefied natural gas production system
11: Dewatering equipment 12: Liquefaction equipment
13: Carbon dioxide removal facility 14: Storage facility
21: storage container 21a: nozzle
22: container assembly 22a: integrated nozzle
23: regasification system 30: storage tank for liquefied natural gas
31: main body 31a: spacer
31b: support base 32: storage container
33: Line unloading line 33a, 33b: Line unloading valve
34: evaporation gas line 34a, 34b: evaporation gas valve
35: pressure sensing part 36: control part
36a: Operation section 37:
38: Heating section 38a: Heat exchanger
38b: electric heater 39:
41: bypass line 41a: bypass valve
42: temperature sensing unit 50: storage container
51: inner shell 51a: entrance
52: outer shell 53:
54: connection channel 55: connection
56: external insulating layer 57: heating member
60, 70: storage container 61: inner shell
62: outer shell 63: support
63a: first flange 63b: second flange
63c: first web 64: heat insulating layer portion
65: Heat insulating member 66: Lower support
80, 90: storage container 81: inner shell
82: outer shell 83: metal core
83a: Support point 84:
86: lower support 100: storage container
95: inner shell 120: outer shell
130: insulating layer portion 140, 150, 160, 170:
141, 151, 161,: Injection parts 142, 152, 162, 172:
143: extension part 144, 174: second flange
163: fastening member 163a:
181, 183: Bolt 182: Nut
200: Pressurized liquefied natural gas production apparatus 210: Refrigerant supply unit
211: Refrigerant line 220: Supply line
221: first branch line 230: heat exchanger
240: regeneration section 241: regeneration fluid supply section
242: regeneration fluid line 243: first valve
244: second valve 250: sensing part
260: controller 270: third valve
300: Floating structure with storage tank conveyor
310: Transporting device of storage tank 311:
311a: Loading stand 311b: Movable footrest
311c: Hinge connecting portion 311d: Auxiliary rail
312: rail 313:
313a: Wheel 313b: Tank protector
320: Floating structure 330: Storage tank
400: High pressure maintenance system of pressurized liquefied natural gas storage vessel
410: unloading line 411: storage container
420: pressure supplement line 430: evaporator
440: Evaporative gas line 450: Compressor
510: Storage vessel 511: Inner shell
512: outer shell 513: insulating layer portion
514: equalizing line 514a: opening / closing valve
514b: second exhaust valve 514c: second exhaust line
515: first exhaust line 515a: first exhaust valve
516a: first connection part 516b: second connection part
517: Support base 518: Lower support
520: Storage vessel 521: Inner shell
521a: Inlet port 522: Outer shell
522a: extension part 523: heat insulating layer part
524: connection part 525, 526, 527: buffer part
525a, 526a, 527a: Loop 525b:
610,640: Natural Gas Liquefaction System with Separated Heat Exchanger
620, 650: Liquefying heat exchanger 621:
622: second flow path 623: liquefaction line
624: opening / closing valve 630, 660: refrigerant cooling section
631, 632, 661: refrigerant heat exchangers 631a, 632a, 661a:
631b, 632b, 661b: a second flow path 631c:
633,663: compressor 634,664: aftercooler
635: separator 636a: first JT valve
636b: second JT valve 636c: third JT valve
637: Refrigerant supply line 638: Refrigerant circulation line
638a: meteorological line 638b: liquid line
638c: connection line 665: inflator
666: Flow distribution valve
700: Liquefied natural gas storage vessel carrier
710: Hull 711: Deck
720: Cargo hold 721: Opening
730: first upper support 740: second upper support
750: lower support 751: reinforcing member
760: Support block 761: Support surface
770: container loading part 791: storage container
792: container box
810: Carbon dioxide solidification removal system 811: Supply line
812: Expansion valve 813: Solidified carbon dioxide filter
814: first opening / closing valve 815: second opening / closing valve
816: heating section 816a: fruit line
816b: regeneration heat exchanger 816c: fourth opening / closing valve
816d: fifth open / close valve 817: third open / close valve
817a: discharge line
820: Connection structure of liquefied natural gas storage vessel
821: sliding engagement portion 822:
823: engaging portion 824:
830: liquefied natural gas storage vessel 831: inner shell
831a: Inlet port 832: Outer shell
833: Insulation layer part 840: External injection part
900: Liquefied natural gas storage vessel 910: Inner shell
920: outer shell 930: support
931: lower support 940:
950: wrinkle structure 951: wrinkle
952: Bend 9521: Angled corner bend
9522: round corner bend 9523: wavy bend
953: Bend angle 954: Wrinkle depth
955: Crease distance 960: Top cover
970: Lower cover
1000: Storage vessel of liquefied natural gas 1010: Inner shell
1020: outer shell 1030: hinge support
1031: Hinge pin 1032: Hinge lug
1033: Hinge rod 1034: Hinge pin insertion hole
1035: Radial center line 1040: Lower support
1050:
1100: Storage vessel of liquefied natural gas 1110: Inner shell
1120: outer shell 1130: protruding support
1131: Lower support block 1132: Upper support block
1133: sliding member 1140: lower support
1150:
1200: liquefied natural gas storage vessel 1210: inner shell
1220: outer shell 1230: thermal deformation support structure
1231: reinforced plastic 1232: bimetal
1233: height direction support structure 1240:
T: the horizontal distance between the inner shell and the inner shell
t: transverse thickness of thermal deformation support structure
t1: transverse thickness of reinforced plastic t2: transverse thickness of bimetal

Claims (15)

In the structure of a liquefied natural gas storage vessel,
An inner shell in which the liquefied natural gas is stored inside;
An outer shell surrounding an outer side of the inner shell to form a space with the inner shell;
A heat insulating layer installed in a space between the inner shell and the outer shell and reducing heat transfer; And
And a support installed in a space between the inner shell and the outer shell to support the inner shell and the outer shell,
Wherein the support base includes a plurality of hinge supports for hinge-connecting and supporting the outer wall surface of the inner shell and the inner wall surface of the outer shell,
Wherein the hinge support absorbs heat shrinkage or thermal expansion of the inner shell due to a temperature change,
And a heat insulating material is inserted into the hinge support to prevent heat from being transmitted to the outside via the hinge support.
Structure of liquefied natural gas storage vessel.
delete The method according to claim 1,
The hinge support includes:
At least one hinge rod connecting the inner shell and the outer shell;
A hinge pin inserted into both ends of the hinge rod, respectively; And
And at least one hinge lug installed in the inner shell and the outer shell to insert and support the hinge pin, respectively.
The method of claim 3,
Wherein the hinge rod is installed to be inclined with respect to the horizontal direction.
The method of claim 4,
Wherein, when two hinge rods are provided, any one of the hinge rods has a slope in an upper right room, and the other hinge rod has a slope in a lower right room.
The method of claim 5,
Wherein the two hinge rods have portions that are bent in opposite directions at opposite positions.
delete delete delete delete delete delete The method according to any one of claims 1 and 3 to 6,
Further comprising a connection flow path provided between the space and the inner side of the inner shell so that the pressure of the space between the inner shell and the outer shell and the pressure inside the inner shell are in equilibrium. Structure.
14. The method of claim 13,
Wherein the inner shell is made of a metal resistant to low temperatures of the liquefied natural gas, and the outer shell is made of a steel material to withstand internal pressure.
15. The method of claim 14,
Wherein the inner shell is capable of withstanding a temperature of from -120 to -95 degrees and the outer shell is capable of withstanding a pressure of from 13 to 25 bar.

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