JP2002358439A - Method and device for lng spot market dealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily accept a different kind of LNG. SOLUTION: By an LNG spot market dealing method 1 which mediates between a seller 2 of LNG and a buyer 3 of LNG, the safety at the LNG base of the buyer of LNG when the property 24 of LNG that the seller of the LNG sells and the property 25 of LNG that the buyer of the LNG has are different is evaluated by simulation and according to the simulation evaluation result, dealings of the LNG are actualized between the seller and buyer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LNG spot market transaction method and an LNG spot market transaction device which mediate between a seller and a buyer in an LNG (liquefied natural gas) spot market.

[0002]

2. Description of the Related Art In recent years, demand for LNG (liquefied natural gas), which generates less carbon dioxide gas per unit calorific value than coal and crude oil, has been expanding in order to reduce environmental burdens such as global warming. .

[0003] In general, LNG, like crude oil, has a long-term production and supply contract between a producing company or a producing country and a gas supply company, a power supply company, or a trading company in each country that consumes LNG. Supply and consumption have been stable throughout.

However, in recent years, the deregulation of the energy industry such as electric power and gas has progressed, and even if each electric power supply company or each gas supply company drafts a long-term power and gas supply plan, In many cases, the actual demand will deviate significantly. However, since each power supply company and each gas supply company have long-term contracts for production and supply with producing companies and countries, it is difficult to adjust the amount of LNG purchased according to demand in a short period of time. It is.

[0005] Since the number of LNG tanks at LNG terminals owned by each power supply company and each gas supply company is limited, it is not possible to accept LNG unlimitedly during periods of low demand. If the demand becomes tight for any reason, the LNG base owned by the company's LNG base will
There is a concern that the quantity will be insufficient.

[0006] When such a situation occurs, it is desired to establish an international spot LNG market where temporary surplus LNG is sold or LNG shortage is temporarily purchased.

[0007]

However, unlike the spot market for crude oil, there are various problems unique to LNG in order to smoothly operate the spot market for LNG.

That is, in general, at the LNG terminal owned by each power supply company or each gas supply company, a method of receiving and receiving the same type of LNG that accepts LNG produced in the same production area in the same tank is adopted. In this LNG receiving and receiving method, tanks are installed for each LNG producing area. Therefore, the operation of each tank at the LNG base is restricted by the frequency of LNG loading from a single production center.

Therefore, when handling LNG in a new production area at the LNG base, it is necessary to add a dedicated tank to the LNG in this production area, even if the annual handling volume of this LNG is small. As a result, many tanks with low operation efficiency are held, and the equipment cost and the maintenance cost increase.

In contrast to the same type of LNG receiving and receiving method having such a problem, there is a different type of LNG receiving and receiving method for receiving LNGs of different origins in the same tank. By adopting this heterogeneous LNG receiving and receiving method, each tank in the LNG base can be operated efficiently.

However, one type (property) of LN
Another type (properties) of LNG in the tank containing G
, There is a concern that a rollover phenomenon may occur due to the generation of a large amount of boil-off gas (boiling gas, abbreviated as BOG) from the liquid level.

That is, LNG having different production areas is methane,
Depending on the composition ratio of LNG such as ethane and propane, LNG
Temperature and density are different. LN loaded on LNG ship
If there is a density difference between G (cargo LNG) and LNG (remaining LNG) in the tank that receives the LNG, LNG may be stratified in the tank by receiving the cargo LNG.

When the LNG is layered in the tank, the density interface between the lower LNG and the upper LNG becomes unstable, and a rapid mixing phenomenon occurs in a short time. as a result,
The temperature near the liquid level of LNG stored in the tank rises, and the amount of BOG generated from the liquid level sharply increases. This phenomenon is called a rollover phenomenon.

At the LNG terminal, BOG continuously generated in each tank is supplied as fuel gas to power plants and consumers. The pressure of the BOG continuously generated in each tank and supplied to the outside as a fuel gas is controlled by a BOG compressor (pressure adjusting device). However, when the rollover phenomenon described above occurs, it cannot be controlled by the BOG compressor. There is a concern that the operation of the LNG terminal may be hindered, for example, the pressure in the gas phase of the tank exceeds the allowable pressure.

Whether or not the rollover phenomenon occurs depends on the relationship between the properties of the cargo LNG and the properties of the storage LNG, the amount of the cargo LNG to be received in the tank, and the storage LNG.
Cannot be easily determined depending on the relationship with the amount.

Therefore, when buying and selling LNG in a spot market where it is required to make a decision to sell or purchase in a short time, the buyer side handles LNG handled within his own LNG base.
Only LNG in the same production area as NG could be purchased.

The present invention has been made in view of such circumstances, and by checking the safety of an LNG base at an LNG buyer in a short time, an LNG seller and an LNG buyer are safe and quick. In addition, the present invention provides an LNG spot market transaction method and an LNG spot market transaction device that can conduct LNG transactions in the spot market, and enable LNG buyers to accept different types of LNG, thereby greatly increasing the number of transactions. The purpose is to:

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an LNG spot market transaction method which mediates between an LNG seller and an LNG buyer.
LNG when the property of LNG sold by the seller of G is different from the property of LNG possessed by the buyer of LNG
Simulates the safety of the buyer at the LNG base, and based on the simulation evaluation results,
Realize LNG trading between sellers and buyers.

Further, in the LNG spot market transaction method of another invention, seller information such as the properties, sales amount, and sales time of the LNG to be sold held by the seller of the LNG is taken in and stored in the storage of the LNG buyer. LNG base information including the properties of LNG, buyer information such as purchase amount, purchase time, etc. are taken in, and for buyers and sellers satisfying the basic conditions of sales amount, purchase amount, sales time and purchase time, LN whose properties differ from those of LNG during storage
The evaluation of the security when accepting G and the efficiency of the LNG base are evaluated by simulation, and based on the simulation evaluation result, the sale and purchase of LNG between the seller and the buyer in the combination are realized.

In the LNG spot market trading method configured as described above, the seller of the LNG is the LNG spot market.
The property of G is notified, and the LNG buyer notifies the property of LNG stored by the buyer. Alternatively, the property of the LNG is notified from the already written LNG property database. Then, an LN property different from the buyer's LNG property
The security when accepting G is evaluated by simulation. Then, when the evaluation of the safety is confirmed, this trading is established.

Therefore, it is possible for the LNG buyer to accept different types of LNG, and the number of transactions can be greatly increased.
For G buyers, transactions can be performed safely and quickly.

Further, in the LNG spot market transaction apparatus of another invention, a spot LNG supply for storing seller information such as properties, sales amount, and sales time of the sales target LNG received from each LNG seller terminal via a network. A database, a spot LNG demand database for storing LNG base information including properties of LNG in storage received from each LNG buyer terminal via a network, purchase amount, purchase time, etc .; Extraction means for extracting a combination of a seller and a buyer that satisfies the basic conditions of the sale time and the purchase time, and for each combination extracted by the extraction means, the buyer assigns an LNG having a property different from the property of the LNG being stored. Security when accepting and LNG
A heterogeneous LNG receiving simulator that simulates and evaluates the efficiency of a base, and an LNG buying and selling instruction between a seller and a buyer, based on the simulation evaluation result of the heterogeneous LNG receiving simulator, constitutes a combination.
Trading instruction means for transmitting to the seller terminal and the LNG buyer terminal.

In the LNG spot market transaction apparatus configured as described above, the seller of each LNG and the buyer of each LNG operate their own terminals to access the LNG spot market transaction apparatus via the network.
Write the seller information and buyer information to the spot LNG supply database and the spot demand database.

In this state, a combination that satisfies the basic conditions such as the quantity and timing of the LNG transaction is automatically extracted, and only the extracted combination of the seller and the buyer is used by the different LNG receiving simulator for the buyer. LN
The safety at the G base is evaluated.

Therefore, the same effect as the LNG spot market transaction method of the invention can be expected.

Also, since the LNG spot market transaction device can be constructed as a Web server on the Internet,
LNG located in a wider area via the Internet
Available to sellers and LNG buyers.

Further, the heterogeneous LNG receiving simulator in the LNG spot market transaction device according to the present invention is characterized in that when the buyer receives into the LNG tank an LNG having a property different from the property of the LNG being stored, the amount of boil-off gas generated from the LNG tank The safety is evaluated based on at least one of the pressure and the pressure of the LNG tank gas phase.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a schematic configuration of an LNG spot market transaction apparatus to which an LNG spot market transaction method according to an embodiment is applied.

For example, a plurality of LNG seller terminals 2 and a plurality of LNG buyer terminals 3 are connected via a communication line 4 to an LNG spot market transaction device 1 constituted by an information processing device such as a computer.

The LNG spot market transaction device 1 has a communication interface (IF) 5 for exchanging various information with each LNG seller terminal 2, and various information exchanges with each LNG buyer terminal 3. Communication interface (IF) 6 for implementation, spot LNG supply database 7 storing each seller information 24 input from each LNG seller terminal 2, spot storing each buyer information 25 input from each LNG buyer terminal 3 An LNG demand database 8, a transaction matching unit 9, a heterogeneous LNG reception simulator 10, a transaction result database 11, and the like are provided.

FIG. 2 is a schematic diagram showing a schematic configuration of an LNG base of a buyer in which the LNG buyer terminal 3 is installed.

A plurality of tanks 13 are provided in an LNG terminal installed near the coast. LNG is supplied from the LNG ship 14 berthing to the sea berth to the designated tank 13 via the LNG receiving line 15. Part of the BOG generated in the tank 13 during this supply process is passed through the gas line 16 and the return gas blower 17 to the LN.
Returned to Vessel G.

The BOG generated in each tank 13 is taken out from the gas line 16 and supplied to a power plant through a BOG compressor 19. In addition, a part of the BOG extracted from the tank 13 to control the tank internal pressure to a predetermined pressure is returned into the tank 13 through the recycling line 20.

The LNG in each tank 13 is led to a vaporizer 22 via an LNG discharge line 21, and the gas vaporized by the vaporizer 22 is supplied to a power plant or the like.

FIG. 3 is a schematic sectional view of each tank 13.
LNG supplied from the LNG receiving line 15 is supplied into the tank 13 from the bottom of the tank 13 via the funnel and the receiving nozzle. L stored in the tank 13
The BOG generated (boiling) from the NG liquid level 23 is the tank 1
3 is discharged from the gas line 16 connected to the upper part,
Recycle gas is returned via the recycle line 20. Further, the pump provided at the bottom of the tank 13
LNG is paid out via the NG payout line 21.

An LNG having a property (kind) different from the property (kind) of LNG already stored in the tank 13 described above.
The rollover phenomenon caused by supplying the same to the same tank 13 can be prevented by sufficiently mixing and agitating the cargo LNG, which is a different kind of LNG, and the LNG in the receiving tank 13 to receive the cargo. it can.

To receive the LNG while mixing and stirring, as shown in FIG.
Through the LNG receiving line 15 connecting the tank 1
The cargo LNG that has flowed into the funnel of the receiving nozzle installed in the tank 3 is received by the bottom of the tank 13. Further, by simultaneously ejecting the remaining LNG in the tank 13 from the mixing nozzle, the cargo LNG and the tank 13 are discharged.
The remaining LNG is mixed.

In FIG. 1, each LNG seller operates his / her own LNG seller terminal 2 to transmit the seller information 24 shown in FIG. In the seller information 24, the LNG properties of the LNG that the user intends to sell in the spot market, such as the composition, temperature, density, etc. of methane, ethane, propane, etc. described above, transport plan, transport route, sales volume, and selling price , Sales time, and the like. The LNG spot market transaction device 1 writes the seller information 24 for each LNG seller received from each LNG seller terminal 2 via the communication interface (IF) 5 into the spot LNG supply database 7.

Each LNG seller can correct or delete the seller information 24 written in the spot LNG supply database 7 as needed.

Similarly, each LNG buyer has its own LNG
By operating the buyer terminal 3, the buyer information 25 shown in FIG. 4B is transmitted to the LNG spot market transaction device 1. The buyer information 25 includes its own LNG base information.
The LNG base information includes tank specifications such as the capacity of each tank 13 of the LNG base shown in FIG.
5 includes properties and operating conditions of LNG currently stored in the tank 13 in which LNG to be purchased this time is to be stored.

Further, the buyer information 25 includes the current L
The information includes a purchase amount of NG (a desired purchase amount), a purchase time, a purchase price, a purchase time, a payment condition, various constraint conditions, and the like. Note that, if necessary, an acceptable L
It is possible to specify the properties of NG. The LNG spot market transaction apparatus 1 writes the buyer information 25 for each LNG buyer received from each LNG buyer terminal 3 via the communication interface (IF) 6 into the spot LNG demand database 8.

Each LNG buyer can modify or delete the buyer information 25 written in the spot LNG demand database 8 as needed. However, buyer information 2
5, data that does not need to be changed for a long period of time, such as tank specifications, does not need to be deleted from the spot LNG demand database 8 so that it is not necessary to reenter the data for each transaction.

In the state where the seller information 24 and the buyer information 25 are written in the spot LNG supply database 7 and the spot LNG demand database 8, respectively,
The transaction matching unit 9 in the NG spot market transaction apparatus 1 follows the flow charts shown in FIGS.
A mediation (matching) process of buying and selling LNG with the G buyer is executed.

FIGS. 5 and 6 show an example in which access is made from the LNG seller terminal 2 side. However, access from the LNG buyer terminal 3 side is almost the same.
Description of the processing operation when accessing from the LNG buyer terminal 3 will be omitted.

First, the LNG seller terminal 2 takes in software such as a GUI or a program relating to a transaction from the LNG spot market transaction apparatus 1 via the communication line 4 and installs it in its own storage unit (S1). Next, from the LNG seller terminal 2 to the LNG spot market transaction device (server) 1
The user is registered for (S2). In particular,
The user registration information is transmitted to the LNG spot market transaction device 1. The LNG spot market transaction device 1 registers the received user registration information in the spot LNG supply database 7 and issues a user account to the LNG seller terminal 2 (P1).

LNG seller terminal 2 for which user registration has been completed
Converts the seller information 24 shown in FIG.
The data is transmitted to the spot market transaction device 1 (S3). The LNG spot market transaction device 1 registers the received seller information 24 in the spot LNG supply database 7 (P2).
Then, the LNG seller terminal 2 issues a search command to the LNG spot market transaction device 1 to search for a buyer that can trade.
The information is transmitted to the spot market transaction device 1 (S4).

The transaction matching unit 9 of the LNG spot market transaction device 1 that has received the buyer search command,
Activate the receiving simulator 10 and execute matching processing and simulation processing of basic conditions concerning transactions between the seller information 24 of the corresponding seller in the spot LNG supply database 7 and each buyer information 25 of the spot LNG demand database 8. Then, the presence or absence of an appropriate trader and the buyer in that case are identified, and the search request source L is determined.
Reply to the NG seller terminal 2 (P3).

When the LNG seller terminal 2 confirms that there is an appropriate trader (S5), the operator (seller) operates from one or more buyers received from the LNG spot market transaction device 1. According to the instruction, the buyer who wants to trade is specified, and information designating the buyer who wants to trade is notified to the LNG spot market transaction device 1 (S
6).

The LNG spot market transaction device 1 is an LNG spot market
LN of the buyer of the transaction destination specified by seller terminal 2
A G-buyer terminal 3 is sent a notification of whether the transaction is possible (P4). Then, when a response indicating whether or not the transaction is possible is received from the LNG buyer terminal 3 of the buyer who desires the transaction, the response indicating whether or not the transaction is possible is returned to the corresponding LNG seller terminal 2 (P5).

When the LNG seller terminal 2 confirms that the buyer desiring the transaction has approved the transaction (S7), the LNG seller terminal 2 executes predetermined transaction establishment processing on its own terminal side, and performs LNG processing.
Notifying the spot market transaction device 1 of the conclusion of the transaction (S
8).

The LNG spot market transaction device 1 is an LNG spot market
Upon receiving the transaction completion notification from the seller terminal 2, a transaction completion notification is transmitted to both the seller terminal 2 and the buyer terminal 3. Then, the properties of the LNG on the seller side and the LN on the buyer side
The property of G, the information of the seller and the information of the buyer are registered in the transaction result database 11 as transaction results. Further, the seller information 24 of the corresponding seller is deleted from the spot LNG supply database 7. Further, the buyer information 25 of the corresponding buyer is deleted from the spot LNG demand database 8 (P
6).

As described above, of the buyer information 25, data that does not need to be changed for a long time, such as tank specifications, is deleted from the spot LNG demand database 8 so that it is not necessary to re-enter it for each transaction. No need to do.

If there is no suitable trader in S5, in S10 the LNG seller terminal 2
When the operator (seller) inputs an instruction to cancel the seller information 24, it is determined that the current transaction is to be canceled, the process returns to S3, and the operator (seller) operates and inputs another seller information 24. It becomes a state of waiting. Further, it instructs the LNG spot market transaction device 1 to cancel the seller information 24. LN
The G spot market transaction device 1 deletes the seller information 24 of the seller from the spot LNG supply database 7 (P7).

In S10, if the operator (seller) does not input an instruction to cancel the seller information 24, the LNG seller terminal 2 does not cancel the current transaction, and a buyer matching the conditions appears. And an extended registration period is designated to the LNG spot market transaction device 1 to notify the LNG spot market transaction device 1 of a transaction request (S11). The LNG spot market transaction device 1 extends the registration of the seller information 24 of the corresponding seller in the spot LNG supply database 7 for the designated extension period (P8).

If the buyer has not been designated as a transaction requesting party by the buyer within the extension registration period designated by himself / herself (S12), the LNG seller terminal 2 returns to S10 and judges whether to extend the extension registration period again. To the operator (seller). Conversely, if the buyer designates the transaction within the extension registration period designated by the buyer, he / she waits for an operation input as to whether or not to permit the transaction, and if the transaction is not permitted (S13), returns to S12. . On the other hand, if the transaction is permitted (S13), the process proceeds to S8, and a transaction establishment process is executed.

If it is determined in S7 that the buyer desiring to do the transaction specified by the seller does not permit the transaction, the process proceeds to S9, in which a plurality of buyers received from the LNG spot market transaction device 1 are selected. If the buyer of another business partner is specified by the operation instruction of the operator (seller), the process proceeds to S6, and the information of the specified buyer who wishes to perform the transaction is transmitted to LNG.
Notify the spot market transaction device 1.

If the operator (seller) does not designate another buyer who wishes to make a transaction in S9, the aforementioned S
The process proceeds to step 10 and waits for the operator (seller) to determine whether or not to input an instruction to cancel the seller information 24.

Next, the different type LNG receiving simulator 10 provided in the LNG spot market transaction apparatus 1 will be described.

As described above, when the total flow rate of BOG generated from all the tanks 13 of the LNG terminal shown in FIG. 2 exceeds the transfer capacity limit of the BOG compressor 19 provided in the gas line 16, the internal pressure of the tank 13 increases. It is feared that the tolerance will be exceeded. Therefore, LN in the tank 13
Each tank 1 containing the amount of BOG generated from the liquid level 23 of G
3 and the gas phase pressure of each tank 13 in consideration of the operating conditions of the LNG base components such as the BOG compressor 19 or the total flow rate of the BOG generated from all the tanks 13 of the LNG base. It is required to set operating conditions for suppressing the BOG extraction flow rate from each tank 13 and the gas phase pressure of the tank 13 within an allowable range by a quantitative and high-precision simulation of the change.

Therefore, the heterogeneous LNG receiving simulator 10 uses the LNG bases shown in FIG. 2 and FIG. Is accepted, as an index relating to the safety of the LNG terminal, a simulation for evaluating the safety of whether the amount of BOG generated from the tank 13 or the internal pressure of the tank 13 is within an allowable range is performed.

For example, in order to carry out this simulation, the capacity of the tank 13 at the LNG base, the properties and quantity (liquid level) of the LNG, the LNG receiving line 15 at the LNG base shown in FIG.
BOG generated from the tank 13 per unit time by using a plurality of physical quantities such as the amount of cargo LNG received per unit time, the properties of the cargo LNG, the total amount of cargo received, etc.
Is calculated.

Then, for example, the margin of the calculated BOG generation amount with respect to the BOG amount that can be pressure-controlled by the BOG compressor 19 is output as a safety simulation evaluation result. If the calculated amount of BOG exceeds the amount of BOG that can be pressure-controlled by the BOG compressor 19, a simulation evaluation result indicating unacceptable is output.

An example of the operation of the heterogeneous LNG receiving simulator 10 having such a simulation evaluation function will be described with reference to the flowchart of FIG.

When one combination of a seller and a buyer that satisfies the basic conditions (trading volume, trading time) for LNG trading is input from the transaction matching unit 9, the seller information 24 of the seller included in this combination is input. Is read from the spot LNG supply database 7, and the buyer information 25 of the buyer included in this combination is read from the spot LNG demand database 8 (Q1).

Specifically, the LN of the seller information 24
The properties of LNG such as the temperature, density, and composition of G, the name of the LNG production place, and the like are read out, and the properties and quantity (liquid level) of the LNG stored in the buyer information 25, the number of tanks 13 that can be received, and the unit Read the acceptable amount per hour (flow rate trend), optimization conditions, etc.

Next, based on the read seller information 24 and buyer information 25, the amount of BOG generated from the tank 13 in which the cargo LNG (purchased LNG) is received, and the mixing state of the cargo LNG and the residual LNG in the tank 13 Is calculated (Q2).

By the time when all the cargo LNG has been received into the tank 13, the cargo LNG in the tank 13 is
It is checked whether mixing of the remaining LNG and the remaining LNG has been completed (Q
3) If the processing is completed, the amount of BOG generated is reduced by the BOG compressor 1 in order to prevent the rollover phenomenon from occurring.
It is determined whether the processing capacity is within the processing capacity of the LNG base set based on the processing capacity of No. 9 (Q4).

If the cargo capacity is within the processing capacity, it is determined whether or not the cargo LNG can be received by another tank 13 in the LNG base based on the number of receiving tanks, the receiving flow rate, the settings in the tanks and the like (Q5). If another tank 13 can accept the BOG, the amount of BOG generated for the other tank 13 is determined, and the optimum operating conditions such as finding the optimum receiving tank 13 are searched (Q6).

If it is impossible to receive the cargo LNG in the corresponding tank 13 in Q3 and Q4, it is determined whether the cargo LNG can be received in another tank 13 in the LNG base, Judgment is made based on the receiving flow rate, tank setting, and the like (Q7). If it can be received in another tank 13, the amount of BOG generated in the other tank 13 is determined, and the optimum operation condition is searched (Q8).

Then, in Q9, of the tanks 13 capable of receiving cargo LNG at this LNG base,
For example, a base operation condition in which the tank 13 with the least amount of BOG is set as the receiving tank 13 is determined. Then, the LNG transaction permission for this base operation condition and this combination is returned to the transaction matching unit 9 as a simulation evaluation result (Q10).

In Q7, if it is impossible to receive cargo LNG in all tanks 13 of this LNG base, it is determined that LNG transactions with this combination of seller and buyer are not permitted (Q11). Then, LNG transaction rejection for this combination is returned to the transaction matching unit 9 as a simulation evaluation result (Q1).
0).

In the LNG spot market transaction apparatus 1 to which the LNG spot market transaction method configured as described above is applied, the seller of each LNG and the buyer of each LNG operate their own terminals 2 and 3 to communicate. By accessing the LNG spot market transaction device 1 via the line 4, FIG.
The seller information 24 shown in (a) and the buyer information 25 shown in FIG. 4B are written in the spot LNG supply database 7 and the spot demand database 8 in the LNG spot market transaction device 1. Further, a search request for a trading partner is sent to the LNG spot market transaction device 1.

Then, the transaction matching unit 9 starts up,
Combinations of sellers and buyers satisfying basic conditions such as the quantity and timing of LNG transactions are automatically extracted, and the extracted combinations are sequentially sent to the heterogeneous LNG receiving simulator 10. Heterogeneous LNG receiving simulator 10
For only the extracted combination of the seller and the buyer, the safety in the case where the cargo LNG is received in the corresponding tank 13 is evaluated by simulation based on the amount of BOG generated in each tank 13 at the LNG base of the buyer. When security is ensured by the simulation evaluation result, a transaction permission is notified to the seller and the buyer.

Therefore, it is possible for the LNG seller and the LNG buyer to easily and safely carry out spot transactions, and to accept LNGs of different types, thereby greatly increasing the number of transactions.

Further, the optimum base conditions for accepting cargo LNG at the buyer's LNG base are automatically set.

FIG. 8 shows an LN according to another embodiment of the present invention.
1 is a schematic configuration diagram of an LNG spot market transaction system to which a G spot market transaction method is applied.

[0086] An LNG having substantially the same configuration as the LNG spot market transaction apparatus 1 shown in FIG.
The spot transaction server 31 is connected. Then, a plurality of LNGs operated by the seller are connected to the Internet 30.
A seller terminal 2 and a plurality of LNG buyer terminals 3 operated by a buyer are connected.

The LNG seller terminal 2 and the LNG buyer terminal 3 can be shared by one terminal.
NG sales operation and purchase operation can be switched.

In the LNG spot market transaction system configured as described above, the LNG spot transaction server 31 that mediates LNG spot market transactions is constructed as a Web server on the Internet. It can be used by LNG sellers and LNG buyers located in the area.

The LNG spot transaction server 31
LN of heterogeneous LNG receiving simulator 10 owned by own
It is also possible to provide each LNG buyer with a function for evaluating the security of the G base for a fee.

[0081]

As described above, in the LNG spot market trading method and apparatus according to the present invention, a different type of LNG from the LNG owned by the LNG buyer is used.
The security of the buyer's LNG base when receiving the information is automatically checked using a simulator.

Therefore, it is possible for the LNG seller and the LNG buyer to carry out LNG transactions in the spot market without worrying about the properties of the LNG, and to allow the LNG buyer to accept different types of LNG. , The number of transactions can be greatly increased.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an LNG spot market transaction apparatus to which an LNG spot market transaction method according to an embodiment of the present invention is applied.

FIG. 2 is a schematic diagram showing a schematic configuration of an LNG base;

FIG. 3 is a schematic cross-sectional view of each tank of the LNG base.

FIG. 4 is a diagram showing contents of seller information and buyer information in the LNG spot market transaction device of the embodiment.

FIG. 5 is a flowchart showing a transaction processing operation in the LNG spot market transaction device of the embodiment.

FIG. 6 is a flowchart showing a transaction processing operation in the LNG spot market transaction device of the embodiment.

FIG. 7 is a flowchart showing a processing operation of a heterogeneous LNG receiving simulator in the LNG spot market transaction device of the embodiment.

FIG. 8 is a schematic configuration diagram of an LNG spot market trading system to which an LNG spot market trading method according to another embodiment of the present invention is applied.

[Explanation of symbols]

 1 LNG spot market transaction device 2 LNG seller terminal 3 LNG buyer terminal 4 Communication line 5, 6 Communication IF 7 Spot LNG supply database 8 Spot LNG demand database 9 Transaction matching unit 10 Heterogeneous LNG receiving simulator 11: Transaction record database 13: Tank 14: LNG carrier 19 ... BOG compressor 23 ... Liquid level 24 ... Seller information 25 ... Buyer information 30 ... Internet 31 ... LNG spot transaction server

Claims (4)

[Claims] 1. An LNG spot market trading method that mediates between an LNG seller and an LNG buyer, wherein the property of the LNG sold by the LNG seller is different from the property of the LNG owned by the LNG buyer. L
An LNG spot market trading method, comprising: simulating and evaluating the safety of an NG buyer at an LNG base; and realizing LNG trading between the seller and the buyer based on the simulation evaluation result. 2. L for sale held by a seller of LNG
Imports seller information such as NG properties, sales volume, sales time, etc., and imports LNG base information including the properties of LNG in storage held by LNG buyers, buyer information such as purchase quantity, purchase time, etc. For a combination of a seller and a buyer who satisfies the basic conditions of quantity, sale time and purchase time, the safety evaluation and the efficiency of the LNG base when the buyer accepts LNG of a property different from the property of LNG in storage are described. An LNG spot market trading method, comprising: performing a simulation evaluation; and realizing LNG trading between a seller and a buyer in the combination based on the simulation evaluation result. 3. A spot LNG supply database for storing seller information such as properties, sales amount, and sales time of LNG to be sold received from each LNG seller terminal via a network, and each LNG buyer terminal via a network. LNG base information including properties of LNG received in storage, purchase amount,
A spot LNG demand database that stores buyer information such as a purchase time, an extraction unit that extracts a combination of a seller and a buyer that satisfies basic conditions of a sales amount and a purchase amount, and a sales period and a purchase time; A heterogeneous LNG receiving simulator that simulates and evaluates the safety and the efficiency of an LNG base when a buyer accepts LNG having a different property from the property of LNG being stored for each combination selected, and a simulation evaluation result of the heterogeneous LNG receiving simulator An LNG spot market transaction device, comprising: an LNG seller terminal that transmits an LNG trading instruction between the seller and the buyer to the LNG seller terminal and the LNG buyer terminal based on the combination. 4. The simulator according to claim 1, wherein the different LNG receiving simulator converts the LNG having a property different from the property of the LNG being stored by the buyer into an LNG.
4. The LNG spot market according to claim 3, wherein the safety is evaluated based on at least one of the amount of boil-off gas generated from the LNG tank and the pressure of the gas phase part of the LNG tank when received in the NG tank. Trading equipment.