JP2014169734A - Liquefaction gas transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquefaction gas transfer system capable of restricting both a large-sized formation of the system and increment in expenditure of its installation, and improving a transfer capability of liquefaction gas from a receiving state tank to a storage state tank.SOLUTION: There is provided a transfer passage 4 for transferring liquefaction gas L from a receiving state tank 2 to a storage state tank 3, the transfer passage 4 is provided with a transfer passage separation valve 7 for shutting off flow of the liquefaction gas L, and control means 8 is constituted such that it can select a non-separated transfer state in which the liquefaction gas L is transferred from the receiving state tank 2 to the storage state tank 3 while the transfer passage separation valve 7 is opened through a single transferring system formed to ride over the transfer passage separation valve 7 and a separated transfer state in which the liquefaction gas L is separately transferred between the receiving state tank 2 and the storage state tank 3 connected to each of a plurality of transfer systems formed without riding over the transfer passage separation valve 7 while the transfer passage separation valve 7 is closed.

Description

  The present invention is connected to an acceptance state tank for receiving liquefied gas from the outside, a storage state tank for transferring and storing liquefied gas from the acceptance state tank, the acceptance state tank and the storage state tank, and the acceptance state tank The present invention relates to a liquefied gas transfer system including a transfer path for transferring liquefied gas from the storage tank to the storage state tank.

  As a conventional liquefied gas transfer system, for example, in Patent Document 1 below, a receiving state tank that receives and temporarily stores liquefied gas from a liquefied gas transport tanker, and a transfer path that transfers liquefied gas discharged from the received state tank And a liquefied gas transfer system including a storage state tank for storing the liquefied gas transferred from the receiving state tank by the transfer path. In this liquefied gas transfer system, the receiving state tank and the storage state tank are connected by a single transfer path, and the liquefied gas temporarily stored in the receiving state tank is transferred to the storage state tank by this transfer path. It is configured.

JP 2001-208297 A

However, the liquefied gas transfer system of Patent Document 1 has a low liquefied gas transfer capability because the liquefied gas is transferred from the receiving state tank to the storage state tank through a single transfer path, and is temporarily stored in the receiving state tank. There is a problem that it takes a long time for the liquefied gas to be transferred to the storage state tank so that the receiving state tank can receive the liquefied gas. Here, the transfer capacity refers to the transfer amount of the liquefied gas. For example, in a liquefied gas transfer system including a plurality of receiving state tanks and storage state tanks, from which receiving state tank to which storage state tank the liquefied gas It also means the selectivity of the destination of the transfer.
Regarding the transfer amount, for example, when the receiving state tank is used as a tank for unloading the liquefied gas transported by the liquefied gas transport tanker at the pier, the liquefied gas is temporarily stored in the receiving state tank. And the liquefied gas transport tanker that has arrived at the pier is forced to wait for a long time until the liquefied gas in the receiving state tank is transferred to the storage state tank and the receiving state tank becomes ready to receive liquefied gas. Problem occurs.
In order to improve the transfer capability of the liquefied gas, a plurality of liquefied gas transfer systems can be provided. In this case, the size of the liquefied gas transfer system increases and the installation cost of the system increases.

On the other hand, regarding the selectivity of the transfer destination, the following problems have become prominent at present.
That is, when liquefied natural gas (LNG) is taken, the place of origin has been remarkably diversified in recent years, and the tendency (particularly the calorific value) and received amount of liquefied natural gas from each place to vary is remarkable. In this situation, considering the transfer of liquefied gas from the receiving tank to the storage tank, it is necessary to increase the selectivity of the transfer system and the transfer destination (storage tank) more than before. However, the liquefied gas transfer system provided with a single transfer path has a limit in dealing with such a problem.

  This invention is made paying attention to this point, and can improve the capability of transferring liquefied gas from the receiving tank to the storage tank while suppressing an increase in system size and installation cost. An object is to provide a liquefied gas transfer system.

In order to achieve the above object, a liquefied gas transfer system according to the present invention comprises:
A receiving tank for receiving liquefied gas from the outside;
A storage tank for transferring and storing liquefied gas from the receiving tank;
A liquefied gas transfer system that is connected to the receiving state tank and the storage state tank and includes a transfer path for transferring liquefied gas from the receiving state tank to the storage state tank, the characteristic configuration of which is
Each receiving state tank and each storage state tank provided in a plurality are individually connected to the transfer path through intermittent means capable of intermittently circulating the liquefied gas,
The transfer path is provided with a transfer path separation valve for blocking the flow of the liquefied gas in the transfer path, and the receiving is received in each of a plurality of transfer systems formed by separating the transfer path by the transfer path separation valve. A state tank and the storage state tank are connected,
Control means for switching the intermittent means and opening and closing the transfer path separation valve,
The control means is
The transfer path separation valve is maintained in the open state, and the intermittent means provided for each of the specific receiving state tank and the specific storage state tank is opened, and the unit is formed so as to straddle the transfer path separation valve. A non-separated transfer state in which the liquefied gas is transferred from the acceptance state tank to the storage state tank in one transfer system;
The plurality of transfer path separation valves are formed without straddling the transfer path separation valve while maintaining the transfer path separation valve in a closed state and opening / closing the intermittent means provided for each of the specific receiving state tank and the specific storage state tank. The transfer state can be selected between a receiving state tank connected to each of the transfer systems and a separated transfer state in which the liquefied gas is separately transferred between the storage state tanks.

In this liquefied gas transfer system, it is possible to use the transfer path as a single transfer path or a plurality of transfer paths by providing a transfer path separation valve in the transfer path for transferring the liquefied gas. The transfer capability described above can be greatly increased in terms of transfer amount and transfer destination selectivity.
More specifically, according to the above characteristic configuration, a single transfer system for transferring liquefied gas from a specific receiving state tank to a specific storage state tank is transferred by opening the transfer path separation valve. Since it is formed across the separation valves, the single transfer system can be in a non-separation transfer state in which the liquefied gas is transferred from the receiving tank to the storage tank.
Also, by closing the transfer path separation valve, the transfer path is separated without crossing the transfer path separation valve, and a plurality of transfer systems are formed, so that the receiving state connected to each transfer system Liquefied gas can be transferred between the tank and the storage tank. That is, it can be set as the separated transfer state which transfers a liquefied gas simultaneously independently by the several transfer system | strain formed in the transfer path.

  Therefore, since a plurality of transfer systems can be formed in the transfer path simply by providing a transfer path separation valve in the transfer path, the storage state tank is changed from the receiving state tank while suppressing an increase in system size and an increase in installation cost. The ability to transfer the liquefied gas to can be improved.

Further features of the liquefied gas transfer system according to the present invention are as follows:
A first transfer path as the transfer path and a second transfer path different from the first transfer path;
The first transfer path is provided with a first transfer path separation valve as the transfer path separation valve for blocking the flow of the liquefied gas in the first transfer path, and the first transfer path is separated from the first transfer path separation valve. One end side first transfer path part extending to one end side of the path and the other end side first transfer path part extending to the other end side, the one end side first transfer path part and the other end side first transfer path part; To each of the receiving state tank and the storage state tank,
The control means includes
The first transfer path separation valve is maintained in an open state, and the intermittent means provided for each of the two specific receiving state tanks and the two specific storage state tanks is opened, so that the first transfer path and the second transfer path are opened. A two-system transfer state as the non-separated transfer state in which the liquefied gas is transferred separately from the receiving state tank to the storage state tank in two systems through the transfer path separately;
The first transfer path separation valve is maintained in a closed state, and the intermittent means provided for each of the three specific receiving state tanks and the three specific storage state tanks is opened, and the first transfer path is Transfer of liquefied gas between the receiving state tank and the storage state tank connected to one end side with respect to one transfer path separation valve, and liquefied gas between the receiving state tank and the storage state tank connected to the other end side The transfer state is configured to be selectable between the three-system transfer state as the separation transfer state in which the transfer is performed and the liquefied gas is separately transferred through the second transfer path.

In this liquefied gas transfer system, a first transfer path as a transfer path and a second transfer path configured separately from the first transfer path are provided for transferring the liquefied gas. And, since the receiving state tank and the storage state tank can be individually interrupted in the first transfer path and the second transfer path, the transfer capacity can be greatly increased in terms of the transfer amount and selectivity. .
More specifically, according to the above-described characteristic configuration, by opening the first transfer path separation valve, the first transfer path and the second transfer path are individually passed through the two specific receiving state tanks. Since the transfer system for transferring the liquefied gas to the two specific storage state tanks can be individually formed one by one, the two-system transfer state in which the liquefied gas is transferred independently by two transfer systems at the same time can be achieved. .
Further, by closing the first transfer path separation valve, the transfer system via the first transfer path is individually connected to the first transfer path part at the one end side and the first transfer path part at the other end side, respectively. Since one system can be formed individually, two transfer systems can be formed. On the other hand, at least one transfer system is formed through the second transfer path. Therefore, it can be set as the 3 system transfer state which transfers liquefied gas independently by 3 systems of transfer systems simultaneously.
In this three-system transfer state, transfer of liquefied gas between the desired receiving state tank connected to the first transfer path part at one end and the desired storage state tank, and connection to the first transfer path part at the other end Transferring the liquefied gas between the desired receiving state tank and the desired storage state tank, and transferring the liquefied gas from the desired receiving state tank to the desired storage state tank via the second transfer path. Can do.

  As described above, by providing the plurality of receiving state tanks and the plurality of storage state tanks separately connected to the first transfer path and the second transfer path, the transfer of the liquefied gas from the receiving state tank to the storage state tank is performed. Ability can be improved.

Further features of the liquefied gas transfer system according to the present invention are as follows:
The second transfer path is provided with a second transfer path separation valve that blocks the flow of the liquefied gas in the second transfer path, and extends from the second transfer path separation valve to one end side of the second transfer path. The receiving state tank and the storage state tank are connected to each of the one end side second transfer path part and the other end side second transfer path part extending to the other end side,
The control means also executes opening / closing control of the second transfer path separation valve.

According to the above characteristic configuration, the second transfer path separation valve is closed so that the transfer system via the second transfer path passes through the one end side second transfer path portion and the other end side second transfer path portion. Since one system is formed in each state, two transfer systems can be formed.
In other words, by closing the second transfer path separation valve, in addition to the transfer system formed via the first transfer path, the desired receiving state tank connected to the one end side second transfer path portion and the desired The liquefied gas is transferred between the storage state tank and the liquefied gas between the desired receiving state tank connected to the second transfer path portion at the other end and the desired storage state tank. be able to. In this way, two transfer systems via the second transfer path are formed, and the transfer capacity of the liquefied gas from the receiving tank to the storage tank is improved while suppressing an increase in system size and installation cost. Can be made.

Further features of the liquefied gas transfer system according to the present invention are as follows:
Separately from the transfer path separation valve, the transfer path is provided with a transfer path additional separation valve that blocks the flow of the liquefied gas in the transfer path,
The receiving state tank and the storage state tank are connected to an intermediate transfer path part that is a part of the transfer path sandwiched between the transfer path additional separation valve and the transfer path separation valve,
The control means performs open / close control of the transfer path additional separation valve, and performs intermittent control of the intermittent means for the receiving state tank and the storage state tank connected to the intermediate transfer path part, and the intermediate transfer path part The transfer from the receiving state tank to the storage state tank is also performed.

According to the above characteristic configuration, by closing the transfer path separation valve and the transfer path additional separation valve, the transfer system via the transfer path becomes one end side first transfer path part, the other end side first transfer path part, and the intermediate transfer path. Since one system is formed in each state via the site, three transfer systems via the transfer path can be formed.
That is, the transfer of the liquefied gas between the desired receiving state tank connected to the first transfer path part on the one end side and the desired storage state tank, and the desired receiving state tank connected to the intermediate transfer path part, Transfer of the liquefied gas between the desired storage state tank and the transfer of the liquefied gas between the desired receiving state tank connected to the first transfer path portion at the other end and the desired storage state tank Can do.

  On the other hand, two transfer systems can be formed by closing one of the transfer path separation valve and the transfer path additional separation valve. For example, in the case where the transfer path additional separation valve is provided on the other end side of the transfer path from the transfer path separation valve, the intermediate transfer path part and the other end side first transfer path part can be set by closing the transfer path separation valve. A transfer system of one system is formed, and liquefied gas is transferred between a desired receiving state tank and a desired storage state tank connected to the intermediate transfer path part and the first transfer path part on the other end side. In addition, a liquefied gas between a desired receiving state tank and a desired storage state tank connected to the one end side first transfer path part by forming one transfer system via the one end side first transfer path part. Can be transferred. On the other hand, by closing the transfer path additional separation valve, one transfer system is formed via the intermediate transfer path part and the one end side first transfer path part, and connected to the intermediate transfer path part and the one end side first transfer path part. The liquefied gas is transferred between the desired receiving state tank and the desired storage state tank, and one transfer system is formed via the first transfer path portion on the other end side. The liquefied gas can be transferred between a desired receiving state tank connected to the transfer path portion and a desired storage state tank.

Schematic which shows the 3 system | strain transfer state of the liquefied gas transfer system which concerns on 1st Embodiment. Schematic which shows the 2 system | strain transfer state of the liquefied gas transfer system which concerns on 1st Embodiment. The figure which shows the transfer time of the liquefied gas in 1st Embodiment Schematic showing the four-system transfer state of the liquefied gas transfer system according to the second embodiment Schematic which shows the three-system transfer state of the liquefied gas transfer system which concerns on 2nd Embodiment. Schematic which shows the three-system transfer state of the liquefied gas transfer system which concerns on 2nd Embodiment. Schematic which shows the two-system transfer state of the liquefied gas transfer system which concerns on 2nd Embodiment. Schematic which shows the 4 system | strain transfer state of the liquefied gas transfer system concerning 3rd Embodiment. Schematic which shows the three-system transfer state of the liquefied gas transfer system which concerns on 3rd Embodiment. Schematic which shows the three-system transfer state of the liquefied gas transfer system which concerns on 3rd Embodiment. Schematic which shows the two-system transfer state of the liquefied gas transfer system concerning 3rd Embodiment.

Hereinafter, based on FIG.1 and FIG.2, 1st Embodiment which concerns on the liquefied gas transfer system of this invention is described.
The liquefied gas transfer system 1 according to the first embodiment includes an acceptance state tank 2 that receives the liquefied gas L from the outside, a storage state tank 3 that transfers and stores the liquefied gas L from the acceptance state tank 2, and an acceptance state tank 2. And a first transfer path 4 that is connected to the storage state tank 3 and transfers the liquefied gas L from the receiving state tank 2 to the storage state tank 3, and a second transfer that is separate from the first transfer path 4. It is comprised by the path 5.
Here, three receiving state tanks 2 and three storage state tanks 3 are provided, respectively, and are individually connected to the first transfer path 4 and the second transfer path 5 via an intermittent means 6 that can freely interrupt the flow of the liquefied gas L. It is connected to the.

The first transfer path 4 is provided with a first transfer path separation valve 7 as a transfer path separation valve that blocks the flow of the liquefied gas L in the first transfer path 4. One end side first transfer path part 10 provided on one end side (left side in FIG. 1) of one transfer path 4 and the other end side first transfer path part 11 provided on the other end side (right side in FIG. 1). Are connected to the receiving state tank 2 and the storage state tank 3. In this embodiment, two receiving state tanks 2 and two storage state tanks 3 are connected to the first transfer path portion 10 on one end side. On the other hand, the receiving state tank 2 and the storage state tank 3 are respectively connected to the first transfer path part 11 on the other end side.
Moreover, the control means 8 which opens and closes the 1st transfer path separation valve 7, and switches the intermittent state of the intermittent means 6 is provided.

Hereinafter, the receiving state tank 2 and the storage state tank 3 will be described.
The acceptance state tank 2 is a tank that is provided, for example, on a jetty or the like where a liquefied gas transport tanker arrives and receives and temporarily stores the liquefied gas L transported by the liquefied gas transport tanker. A receiving liquefied gas inlet (not shown) is provided. The receiving state tank 2 is connected by the first transfer path 4 and the first outflow path 2a, and is connected by the second transfer path 5 and the second outflow path 2b. Each of the first outflow path 2a and the second outflow path 2b is provided with a transfer pump (not shown), and the liquefied gas L is supplied from the receiving state tank 2 to the first transfer path 4 and the second transfer path 5. It is configured to be allowed to flow out to the outside. A first outflow path interrupting valve 2c that allows the first outflow path 2a to be opened and closed and a second outflow path interrupting valve 2d that allows the second outflow path 2b to be opened and closed are provided. The circulation of the liquefied gas L in the two outflow passages 2b is configured to be intermittent. The liquefied gas L is composed of, for example, liquefied natural gas (LNG).

  The storage state tank 3 is a tank that transfers and stores the liquefied gas L temporarily stored in the reception state tank 2 from the reception state tank 2. The storage state tank 3 is connected by the first transfer path 4 and the first inflow path 3a, and is connected by the second transfer path 5 and the second inflow path 3b. In addition, the first inflow passage 3a and the second inflow passage 3b include a first inflow passage intermittent valve 3c that allows the first inflow passage 3a to be opened and closed, and a second inflow passage that allows the second inflow passage 3b to be opened and closed, respectively. An intermittent valve 3d is provided, and the flow of the liquefied gas L in the first inflow path 3a and the second inflow path 3b is configured to be intermittent.

In this way, the first outflow path interruption valve 2c, the second outflow path interruption valve 2d, the first inflow path interruption valve 3c, and the second inflow path interruption valve 3d constitute the interruption means 6, and the control means 8 Intermittent is controlled.
Hereinafter, the control of the control means 8 will be described with reference to the drawings. In the drawings, the valve in the open state is indicated by “white”, and the valve in the closed state is indicated by “black”. Further, the path through which the liquefied gas L is transferred is indicated by “thick line” from the acceptance state tank 2 to the storage state tank 3. The same applies to FIGS.

As shown in FIG. 2, the control means 8 maintains the first transfer path separation valve 7 in an open state, and is provided with a predetermined amount provided for each of the two specific receiving state tanks 2 and the two specific storage state tanks 3. Non-separation transfer state in which the liquefied gas L is transferred from the receiving state tank 2 to the storage state tank 3 in two systems through the first transfer path 4 and the second transfer path 5 separately with the intermittent means 6 opened. 2 system transfer state as
As shown in FIG. 1, the first transfer path separation valve 7 is maintained in a closed state, and predetermined intermittent means 6 provided for the three specific receiving state tanks 2 and the three specific storage state tanks 3 are opened. As for the state, with respect to the first transfer path 4, the transfer of the liquefied gas L between the receiving state tank 2 and the storage state tank 3 connected to one end side with respect to the first transfer path separation valve 7 and the other end side is connected. The liquefied gas L is transferred between the receiving state tank 2 and the storage state tank 3 to be transferred, and the liquefied gas L is separately transferred through the second transfer path 5. The transfer state can be selected between them.

That is, in the three-system transfer state, as in the example shown in FIG. 1, the first transfer path separation valve 7 is closed and any one of the receiving state tanks 2 connected to the first transfer path portion 10 on the one end side is used. Any of the first outflow passage interrupting valves 2c in the open state in which the liquefied gas L can flow (the other first outflow passage intermittence valves 2c are closed) and connected to the first transfer passage portion 10 on one end side. The first inflow passage intermittence valve 3c of one storage state tank 3 is opened (the other first inflow passage intermittence valve 3c is closed) to form one transfer system via the first transfer path portion 10 on one end side. be able to.
In addition, the first outflow path interrupting valve 2c of the receiving state tank 2 connected to the other end side first transfer path part 11 is opened, and the storage connected to the other end side first transfer path part 11 is stored. The first inflow passage intermittency valve 3c of the state tank 3 can be opened to form one transfer system via the other end side first transfer passage portion 11.
Furthermore, in the 2nd transfer path 5, it is connected to the 1st transfer path site | part 10 at the one end side, and the 2nd outflow path intermittent valve of the acceptance state tank 2 which does not form the transfer system via the 1st transfer path site | part 10 at the one end side 2d is opened (the other second outflow passage intermittency valve 2d is closed), and also connected to one end-side first transfer path section 10 to form a transfer system via the one end-side first transfer path section 10. The second inflow passage intermittence valve 3d of the storage state tank 3 that is not open is opened (the other second inflow passage intermittence valve 3d is closed), so that one transfer system can be formed.
In this way, three transfer systems are simultaneously formed via the first transfer path 4 and the second transfer path 5, and the three-system transfer state in which the liquefied gas L is independently transferred in the three transfer systems, can do.

  In the present embodiment, the first transfer path between the receiving state tank 2 connected to the right side and the storage state tank 3 connected to the right side in the first transfer path part 10 on one end side in FIG. 4, but the one end side first transfer path part between the receiving state tank 2 connected to the right side and the storage state tank 3 connected to the left side in the one end side first transfer path part 10. A transfer system through 10 may be formed. In addition, a transfer system is formed between the receiving state tank 2 connected to the left side and the storage state tank 3 connected to the right side at the one end side first transfer path part 10 via the one end side first transfer path part 10. May be. Further, the receiving state tank 2 connected to the left side at the one end side first transfer path part 10 and the storage state tank 3 connected to the left side are connected to form a transfer system via the first transfer path 4. May be.

Further, in the two-system transfer state, as in the example shown in FIG. 2, the first transfer path separation valve 7 is opened, and the first outflow path interrupting valve 2c of any one of the receiving state tanks 2 is opened. At the same time, the first inflow passage intermittence valve 3c of any one of the storage state tanks 3 can be opened to form one transfer system through the first transfer passage 4. Furthermore, in the second transfer path 5, the second outflow path interrupting valve 2 d of any one of the receiving state tanks 2, which does not form a transfer system via the first transfer path 4, is opened. One transfer system via the second transfer path 5 can be formed by opening the second inflow path interrupting valve 3 d of one storage state tank 3.
In this way, two transfer systems are simultaneously formed via the first transfer path 4 and the second transfer path 5, and the two-system transfer state in which the liquefied gas L is independently transferred in the two transfer systems, can do.

  In this embodiment, in the first transfer path 4 in FIG. 2, the first transfer path 4 is connected between the receiving state tank 2 connected to the center and the storage state tank 3 connected to the right side via the first transfer path 4. The transfer system of the system is formed, but between the acceptance state tank 2 connected to the center in the first transfer path 4 and the storage state tank 3 connected to the right side or the storage state tank 3 connected to the center. Alternatively, a single transfer system may be formed via the first transfer path 4. In addition, one transfer system is formed via the first transfer path 4 between the receiving state tank 2 connected to the right side or the receiving state tank 2 connected to the left side and any one storage state tank 3. May be.

FIG. 3 shows the transfer times T2 and T3 of the liquefied gas L in the three-system transfer state shown in FIG. 1 and the two-system transfer state shown in FIG. The vertical axis in FIG. 3 shows the total amount of remaining liquefied gas Q in the three receiving state tanks 2, and the horizontal axis shows time T. The liquefied gas remaining amount Q in the two-system transfer state is indicated by a broken line, and the liquefied gas remaining amount Q in the three-system transfer state is indicated by a solid line. And it is shown by the acceptance time T1 of the liquefied gas L from the liquefied gas transport tanker to the acceptance state tank 2. This reception time T1 is a state in which the liquefied gas L is simultaneously received from the liquefied gas transport tanker into the three receiving state tanks 2, and the liquefied gas L is from an empty state in which the three receiving state tanks 2 are empty. This is the time until a full state is reached. Therefore, the time is the same regardless of the two-system transfer state or the three-system transfer state. Further, the time required for transferring the liquefied gas L in the two-system transfer state is indicated by a transfer time T2, and the time required for transferring the liquefied gas L in the three-system transfer state is indicated by a transfer time T3.
The relationship between the liquefied gas remaining amount Q and the transfer time T2 and the transfer time T3 shown in FIG. 3 is that the capacity of the three receiving state tanks 2 is the same, and the transfer capability of the liquefied gas L in all transfer systems is It is the relationship in the liquefied gas transfer system 1 comprised similarly.

In the transfer of the liquefied gas L in the two-system transfer state, as shown in FIG. 2, the liquefied gas L is transferred from the liquefied gas L in the two receiving state tanks 2 to the separate storage state tank 3 by the two-system transfer system. Then, after the transfer of the liquefied gas L in the two receiving state tanks 2 is completed, the transfer of the liquefied gas L in the remaining one receiving state tank 2 to the storage state tank 3 is one transfer system. Is started as a one-system transfer state. Therefore, the liquefied gas remaining amount Q shows the change indicated by the broken line in FIG. 3 and is necessary for transferring the liquefied gas L in the three receiving state tanks 2 to the three storage state tanks 3 in the two-system transfer state. Is the transfer time T2 shown in FIG.
On the other hand, in the transfer of the liquefied gas L in the three-system transfer state, as shown in FIG. 1, the liquefied gas L in the three receiving state tanks 2 is simultaneously transferred to the separate storage state tanks 3 by the three transfer systems. Can be transported. Therefore, the liquefied gas remaining amount Q shows a change indicated by a solid line in FIG. 3 and is necessary for the liquefied gas L in all the receiving state tanks 2 to be transferred to the storage state tank 3 by the three-system transfer state. The transfer time T3, which is time, can be shortened compared to the transfer time T2 in the two-system transfer state.

[Second Embodiment]
Hereinafter, 2nd Embodiment of the liquefied gas transfer system which concerns on this invention is described based on FIGS. In the second embodiment, the first transfer path 4 is provided with a first transfer path additional separation valve 20 as a transfer path additional separation valve in addition to the first transfer path separation valve 7. It is different from the form.

That is, the liquefied gas transfer system 1 according to the second embodiment blocks the flow of the liquefied gas L in the first transfer path 4 in the first transfer path 4 separately from the first transfer path separation valve 7. An intermediate first as an intermediate transfer path part which is provided with a first transfer path additional separation valve 20 and is a part of the first transfer path 4 sandwiched between the first transfer path additional separation valve 20 and the first transfer path separation valve 7. The receiving state tank 2 and the storage state tank 3 are connected to the transfer path part 12.
Further, the control means 8 performs opening / closing control of the first transfer path additional separation valve 20 and also performs intermittent control of the intermittent means 6 for the receiving state tank 2 and the storage state tank 3 connected to the intermediate first transfer path portion 12. And the transfer from the receiving state tank 2 to the storage state tank 3 via the intermediate first transfer path portion 12 is also performed.

As shown in FIG. 4, the control means 8 closes the first transfer path separation valve 7 and the first transfer path additional separation valve 20, so that the transfer system via the first transfer path 4 becomes one end side first transfer path. Since one system each is formed via the part 10, the first transfer path part 11 on the other end side, and the intermediate first transfer path part 12, three transfer systems can be formed.
That is, the transfer of the liquefied gas L through the one end side first transfer path part 10 between the receiving state tank 2 and the storage state tank 3 connected to the one end side first transfer path part 10 and the intermediate first transfer path. Transfer of the liquefied gas L via the intermediate first transfer path part 12 between the receiving state tank 2 and the storage state tank 3 connected to the part 12 and the other end side first transfer path part 11 The transfer of the liquefied gas L between the receiving state tank 2 and the storage state tank 3 through the first transfer path portion 11 on the other end side can be performed separately and simultaneously in the first transfer path 4. Furthermore, in the second transfer path 5, one transfer system via the second transfer path 5 is formed, so that the four-system transfer state in which the liquefied gas L is simultaneously transferred by the four transfer systems can be achieved. Therefore, the capability of transferring the liquefied gas L from the receiving state tank 2 to the storage state tank 3 can be improved while suppressing an increase in system size and an increase in installation cost.

Further, by closing either one of the first transfer path separation valve 7 and the first transfer path additional separation valve 20, a two-line transfer system is formed via the first transfer path 4, and the second transfer One transfer system through the path 5 is formed, and a three-system transfer state can be obtained. For example, as shown in FIG. 5, only the first transfer path separation valve 7 is closed, so that either one of the intermediate first transfer path part 12 and the one end side first transfer path part 10 is connected. A transfer system is formed between the state tank 2 and the storage state tank 3 to transfer the liquefied gas L via the intermediate first transfer path part 12 and the one end side first transfer path part 10 and A transfer system is formed between the receiving state tank 2 and the storage state tank 3 connected to the one transfer path part 11 to transfer the liquefied gas L via the other end side first transfer path part 11. it can.
Moreover, as shown in FIG. 6, it is connected to the intermediate | middle 1st transfer path site | part 12 and the other end 1st transfer path site | part 11 by making only the 1st transfer path addition separation valve 20 into a closed state, for example. A transfer system is formed between any of the receiving state tanks 2 and the storage state tanks 3 to transfer the liquefied gas L via the intermediate first transfer path part 12 and the other end side first transfer path part 11. The liquefied gas L can be transferred by forming a transfer system between any one of the receiving state tank 2 and the storage state tank 3 connected to the first transfer path portion 10 on the one end side.
On the other hand, as shown in FIG. 7, by opening both the first transfer path separation valve 7 and the first transfer path additional separation valve 20, one transfer system is formed via the first transfer path 4. At the same time, one transfer system via the second transfer path 5 can be formed, and a two-system transfer state can be established.

[Third Embodiment]
Hereinafter, 3rd Embodiment of the liquefied gas transfer system which concerns on this invention is described based on FIGS. The third embodiment is the same as the first embodiment described above in that the first transfer path 4 is provided with the first transfer path separation valve 7, but the second transfer path 5 has the second transfer path. This is different from the first embodiment in that a separation valve 30 is provided.

  That is, in the liquefied gas transfer system 1 according to the third embodiment, the second transfer path 5 is provided with the second transfer path separation valve 30 that blocks the flow of the liquefied gas L in the second transfer path 5, The acceptance state tank 2 and the second transfer path part 40 on one end side extending to one end side of the second transfer path 5 from the second transfer path separation valve 30 and the second transfer path part 41 on the other end side extending to the other end side, respectively. A storage tank 3 is connected. Further, the control means 8 is configured to also execute opening / closing control of the second transfer path separation valve 30.

  As shown in FIG. 8, the control means 8 closes the first transfer path separation valve 7 and the second transfer path separation valve 30, whereby one end side first transfer path portion 10 in the first transfer path 4. The two transfer systems of the transfer system via the first transfer path portion 11 and the transfer system via the other end side are formed, and in the second transfer path 5, the transfer system via the one end side second transfer path portion 40 is formed. And a transfer system via the second transfer path part 41 on the other end side can be formed, and a four-system transfer state in which the liquefied gas L is transferred by the four transfer systems at the same time can be formed. .

Then, as shown in FIG. 9, only the first transfer path separation valve 7 is closed, thereby forming two transfer systems via the first transfer path 4 and 1 via the second transfer path 5. It is possible to form a three-system transfer state by forming a system transfer system. Further, as shown in FIG. 10, only the second transfer path separation valve 30 is closed, thereby forming one transfer system via the first transfer path 4 and 2 via the second transfer path 5. It is possible to form a three-system transfer state by forming a system transfer system.
On the other hand, as shown in FIG. 11, by opening both the first transfer path separation valve 7 and the second transfer path separation valve 30, a single transfer system is formed via the first transfer path 4. In addition, a single transfer system can be formed via the second transfer path 5 to obtain a two-system transfer state.

[Another embodiment]
(A) In the above embodiment, the transfer pump for transferring the liquefied gas L is provided in each of the first outflow path 2a and the second outflow path 2b. However, the present invention is not limited to this, and the first transfer path 4 and the second transfer A transfer pump may be provided on the transfer system in the path 5.

(B) In the first embodiment, two receiving state tanks 2 and two storage state tanks 3 are provided in one end side first transfer path part 10, and the receiving state tank is provided in the other end side first transfer path part 11. 2 and one storage state tank 3 are provided, but not limited to this, the receiving state tank 2 and the two storage state tanks 3 are provided in the first transfer path part 11 on the other end side. One receiving state tank 2 and one storage state tank 3 may be provided in the first transfer path part 10.

(C) In the first embodiment, three acceptance state tanks 2 and three storage state tanks 3 are provided, but not limited to this, four or more acceptance state tanks 2 and storage state tanks 3 are provided. The number of the receiving state tanks 2 and the storage state tanks 3 provided may be different. Further, a separation valve may be additionally provided in the first transfer path 4 and the second transfer path 5.

(D) In the second embodiment and the third embodiment, four receiving state tanks 2 and four storage state tanks 3 are provided. However, the present invention is not limited to this, and the receiving state tank 2 and the storage state tank 3 are provided. 3 or 5 or more may be provided, and the number of the receiving state tank 2 and the storage state tank 3 provided may be different. Further, a separation valve may be additionally provided in the first transfer path 4 and the second transfer path 5.

(E) In the third embodiment, only the first transfer path separation valve 7 is provided in the first transfer path 4. In addition, the first transfer path additional separation valve is provided in the first transfer path 4. 20 may be provided. In this case, as a configuration in which the receiving state tank 2 and the storage state tank 3 are provided in the intermediate first transfer path portion 12 shown in the second embodiment, one transfer system via the intermediate first transfer path portion 12 is provided. Can be additionally formed. Therefore, by combining one transfer system via this intermediate first transfer path portion 12 and, for example, four transfer systems shown in FIG. 4, five transfer systems are formed. The liquefied gas L can be transferred independently.

(F) In the said embodiment, in FIG.1, 2, and FIGS. However, the storage state tank 3 and the receiving state tank 2 are connected to the first transfer path 4 and the second transfer path 5 through an outflow path or an inflow path through which the liquefied gas L provided with the intermittent means 6 can flow. Since all the tanks shown as the storage state tank 3 and the reception state tank 2 are the same as the storage state tank 3 and the reception state tank 2, the storage state tank 3 and the reception state tank 2 It functions as both of the state tank 2. Thereby, in consideration of the storage state of the liquefied gas L in the tank, the desired tank can be used as the receiving state tank 2 for receiving the liquefied gas L, and the liquefied gas L is transferred to the desired tank. It can be used as a storage state tank 3 that stores the

(G) In the above embodiment, the first outflow path 2a and the second outflow path 2b are connected to the first transfer path 4 and the second transfer path 5 independently of the receiving state tank 2, respectively. The first outflow path 2a and the second outflow path are not limited, and a single outflow path connected to the receiving state tank 2 is provided, and the first outflow path 4 side and the second transfer path 5 side of the single outflow path are provided. 2b may be formed separately, and the first outflow path 2a and the second outflow path 2b may be connected to the first transfer path 4 and the second transfer path 5, respectively. And the single outflow path may be provided with the combined flow path intermittent valve which can interrupt the liquefied gas L which flows through the inside of a single outflow path. In addition, a transfer pump that transfers the liquefied gas L may be provided in the outflow channel.

(H) In the above embodiment, the first inflow path 3a and the second inflow path 3b are connected to the storage state tank 3 independently from the first transfer path 4 and the second transfer path 5, respectively. Not limited to this, an inflow merging passage is provided to join before the first inflow passage 3 a and the second inflow passage 3 b are connected to the storage state tank 3, and the inflow merging passage is connected to the storage state tank 3. Also good. In addition, the inflow joint channel may be provided with a joint passage intermittent valve that can intermittently connect the liquefied gas L flowing through the inflow joint channel. Moreover, the transfer pump which transfers the liquefied gas L may be provided in the inflow joining flow path.

(I) In the above embodiment, the first transfer path 4 and the second transfer path 5 are provided for transferring the liquefied gas L. However, the present invention is not limited to this, and the second transfer path 5 is not provided. You may comprise only the 1st transfer path 4 as a path.
In this case, the control means 8 keeps the first transfer path separation valve 7 in the open state, and opens the intermittent means 6 provided for the specific receiving state tank 2 and the specific storage state tank 3, respectively. A non-separation system transfer state in which the liquefied gas L is transferred from the receiving state tank 2 to the storage state tank 3 in a single transfer system through the first transfer path 4 in a state of straddling the first transfer path separation valve 7;
While maintaining the 1st transfer path separation valve 7 in a closed state, the intermittent means 6 provided with respect to the specific receiving state tank 2 and the specific storage state tank 3 is made into an open state, respectively, Without separation, the separated transfer state in which the liquefied gas L is separately transferred between the receiving state tank 2 and the storage state tank 3 connected to each of the plurality of transfer systems via the first transfer path 4. The transfer state may be selectable.
Here, the 1st transfer path 4 may be comprised by the singular, and may be comprised by multiple. For example, in the case where the first transfer path 4 is constituted by a single unit and the first transfer path 4 is provided with one first transfer path separation valve 7, two transfer systems are formed. The liquefied gas L from the two receiving state tanks 2 may be separately transferred to the two storage state tanks 3 at the same time. On the other hand, for example, when the first transfer path 4 is composed of three, and each of the first transfer paths 4 is provided with one first transfer path separation valve 7, six transfers A system may be formed, and the liquefied gas L from the six receiving state tanks 2 may be separately transferred to the six storage state tanks 3 at the same time.

(J) In the above embodiment, a single first transfer path 4 and a single second transfer path 5 are provided as transfer paths. However, the present invention is not limited to this, and a plurality of first transfer paths 4 may be provided. Good. A plurality of second transfer paths 5 may be provided. In this case, the receiving state tank 2 or the storage state tank 3 may be connected to each of the first transfer path 4 and the second transfer path 5 by an inflow path or an outflow path of the liquefied gas L.

  As described above, it is possible to provide a liquefied gas transfer system capable of improving the liquefied gas transfer capability from the receiving tank to the storage tank while suppressing an increase in system size and an increase in installation cost. .

1 Liquefied Gas Transfer System 2 Accepted State Tank 3 Storage State Tank 4 First Transfer Path (Transfer Path)
5 Second transfer path 6 Intermittent means 7 First transfer path separation valve (transfer path separation valve)
8 control means 10 one end side first transfer path part 11 other end side first transfer path part 12 intermediate transfer path part 20 transfer path additional separation valve 30 second transfer path separation valve 40 one end side second transfer path part 41 other end side Second transfer path part L Liquefied gas

Claims (4)

A receiving tank for receiving liquefied gas from the outside;
A storage tank for transferring and storing liquefied gas from the receiving tank;
A liquefied gas transfer system comprising a transfer path connected to the receiving state tank and the storage state tank and transferring liquefied gas from the receiving state tank to the storage state tank;
Each receiving state tank and each storage state tank provided in a plurality are individually connected to the transfer path through intermittent means capable of intermittently circulating the liquefied gas,
The transfer path is provided with a transfer path separation valve for blocking the flow of the liquefied gas in the transfer path, and the receiving is received in each of a plurality of transfer systems formed by separating the transfer path by the transfer path separation valve. A state tank and the storage state tank are connected,
Control means for switching the intermittent means and opening and closing the transfer path separation valve,
The control means is
The transfer path separation valve is maintained in the open state, and the intermittent means provided for each of the specific receiving state tank and the specific storage state tank is opened, and the unit is formed so as to straddle the transfer path separation valve. A non-separated transfer state in which the liquefied gas is transferred from the acceptance state tank to the storage state tank in one transfer system;
The plurality of transfer path separation valves are formed without straddling the transfer path separation valve while maintaining the transfer path separation valve in a closed state and opening / closing the intermittent means provided for each of the specific receiving state tank and the specific storage state tank. A liquefied gas transfer system configured to be able to select a transfer state between a receiving state tank connected to each of the transfer systems and a separated transfer state for separately transferring a liquefied gas between storage state tanks . A first transfer path as the transfer path and a second transfer path different from the first transfer path;
The first transfer path is provided with a first transfer path separation valve as the transfer path separation valve for blocking the flow of the liquefied gas in the first transfer path, and the first transfer path is separated from the first transfer path separation valve. One end side first transfer path part extending to one end side of the path and the other end side first transfer path part extending to the other end side, the one end side first transfer path part and the other end side first transfer path part; To each of the receiving state tank and the storage state tank,
The control means includes
The first transfer path separation valve is maintained in an open state, and the intermittent means provided for each of the two specific receiving state tanks and the two specific storage state tanks is opened, so that the first transfer path and the second transfer path are opened. A two-system transfer state as the non-separated transfer state in which the liquefied gas is transferred separately from the receiving state tank to the storage state tank in two systems through the transfer path separately;
The first transfer path separation valve is maintained in a closed state, and the intermittent means provided for each of the three specific receiving state tanks and the three specific storage state tanks is opened, and the first transfer path is Transfer of liquefied gas between the receiving state tank and the storage state tank connected to one end side with respect to one transfer path separation valve, and liquefied gas between the receiving state tank and the storage state tank connected to the other end side The transfer state is configured to be selectable between the three-system transfer state as the separation transfer state in which the transfer is performed and the liquefied gas is separately transferred through the second transfer path. Liquefied gas transfer system. The second transfer path is provided with a second transfer path separation valve that blocks the flow of the liquefied gas in the second transfer path, and extends from the second transfer path separation valve to one end side of the second transfer path. The receiving state tank and the storage state tank are connected to each of the one end side second transfer path part and the other end side second transfer path part extending to the other end side,
The liquefied gas transfer system according to claim 2, wherein the control unit also executes opening / closing control of the second transfer path separation valve. Separately from the transfer path separation valve, the transfer path is provided with a transfer path additional separation valve that blocks the flow of the liquefied gas in the transfer path,
The receiving state tank and the storage state tank are connected to an intermediate transfer path part that is a part of the transfer path sandwiched between the transfer path additional separation valve and the transfer path separation valve,
The control means performs open / close control of the transfer path additional separation valve, and performs intermittent control of the intermittent means for the receiving state tank and the storage state tank connected to the intermediate transfer path part, and the intermediate transfer path part The liquefied gas transfer system according to any one of claims 1 to 3, wherein the transfer from the receiving state tank to the storage state tank is also performed via the liquefied gas.

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