JP2010092310A - Lng management system and lng management program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LNG (Liquefied Natural Gas) management system which can properly and quickly obtain the amount of LNG and the number of days which can be used for power generation. <P>SOLUTION: The LNG management system includes: a holding amount server 2 for managing and memorizing the holding amount of LNG in a power plant; a server 3 for other than power generation which manages and memorizes the holding amount of LNG for other than power generation; and a power generation server 4 which acquires the amount of LNG used for other than power generation from the server 3 while acquiring the LNG holding amount from the holding amount server 2. The power generation server 4 computes the amount of LNG which can be used for power generation based on the LNG holding amount and the amount of LNG used for other than power generation, and further computes the number of available days for power generation based on the computed LNG amount which can be used for power generation and a load factor of power generation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LNG management system and an LNG management program for managing the amount of LNG (liquefied natural gas) held or used in a power plant.

  LNG is mainly transported from abroad to LNG carriers by domestic LNG carriers, and a system for quickly creating a LNG ship allocation plan is known in order to smoothly receive LNG (for example, (See Patent Document 1). Further, a system is known that determines an optimum demand area that is efficient and obtains the maximum profit based on the power generation capacity of the demand area (receiving base), and directs the LNG ship (for example, see Patent Document 2). ).

On the other hand, in power plants that consume LNG, the LNG ordering / acceptance plan based on the actual usage (consumption), consumption plan, etc., while accurately grasping the amount of LNG held (residual amount) It is necessary to make a power generation plan. That is, for example, in a power plant, it is necessary to grasp the amount of LNG held and calculate the amount of LNG that can be used for power generation and the number of days that can be generated based on a consumption plan or the like.
JP 2004-238180 A JP 2006-260155 A

  By the way, in a power plant, in addition to using LNG held for power generation, there are cases where it is sold to the outside through a tank truck or a pipeline. In such a case, it takes a lot of labor and time to calculate the amount of LNG that can be used for power generation, the number of days that power can be generated, and the like, and it has been difficult to calculate and grasp appropriately and quickly. That is, it is necessary to obtain information such as the amount of LNG held and the amount sold to the outside, and grasp and calculate the load factor of power generation. Such information must be obtained and grasped manually, and since the departments that manage the amount of LNG held and the departments that sell LNG are different, such as obtaining appropriate and prompt information. It was difficult. As a result, it has been difficult to properly and quickly grasp the amount of LNG that can be used for power generation, the number of days that power can be generated, and the like.

  Therefore, an object of the present invention is to provide an LNG management system and an LNG management program capable of appropriately and quickly grasping the amount of LNG that can be used for power generation, the number of days that power can be generated, and the like.

  In order to achieve the above object, the invention described in claim 1 is an LNG management system that manages the amount of LNG held and used in a power plant, and manages and stores the amount of LNG held in the power plant Amount management means, non-power generation use management means for managing and storing LNG usage other than power generation, LNG possession amount obtained from the possession quantity management means, and non-power generation obtained from the non-power generation use management means And a power generation management means for calculating the amount of LNG that can be used for power generation based on the amount of LNG used.

(Function)
The LNG possession amount in the power plant is managed and stored by the possession amount management means, and the LNG use amount other than the power generation is managed and stored by the non-power generation use management means. Then, the LNG possession amount and the LNG usage amount are acquired by the power generation management means, and the LNG amount usable for power generation is calculated.

  According to a second aspect of the present invention, in the LNG management system according to the first aspect, the power generation management means can generate power based on the calculated LNG amount usable for the power generation and a load factor of power generation. It is characterized by calculating the number of days.

  According to a third aspect of the present invention, in the LNG management system according to the second aspect, the power generation management means accepts LNG based on the calculated number of days that can be generated and the number of days required to receive the LNG. It is characterized by determining the day to be requested.

  According to a fourth aspect of the present invention, in the LNG management system according to any one of the first to third aspects of the present invention, the possessed amount management means includes an LNG amount actually held and an LNG amount planned to be received. Based on the above, the LNG possession amount is managed and stored.

  According to a fifth aspect of the present invention, in the LNG management system according to any one of the first to fourth aspects, the non-power generation use managing means is configured to use the LNG usage amount other than the power generation based on past performance data. It is characterized by managing and storing.

  The invention described in claim 6 is an LNG management program for managing the amount of LNG held or used at a power plant, and a computer is used to manage and store the amount of LNG held at the power plant; Can be used for power generation based on non-power generation use management means for managing and storing LNG usage other than power generation, LNG possession quantity by the possession quantity management means, and LNG use quantity by the non-power generation use management means It is an LNG management program for functioning as a power generation management means for calculating the amount of LNG.

  According to a seventh aspect of the present invention, in the LNG management program according to the sixth aspect, the power generation management means can generate power based on the calculated LNG amount usable for the power generation and a load factor of power generation. It is characterized by calculating the number of days.

  According to the first and sixth aspects of the present invention, the LNG possessed amount managed and stored by the retained amount management means and the LNG use amount other than the power generation managed and stored by the non-power generation use managing means (hereinafter referred to as the following) The amount of LNG that can be used for power generation (hereinafter referred to as “the amount of LNG for power generation” as appropriate) is calculated based on “the amount used outside power generation” as appropriate. Thus, since the information required for calculation is obtained and calculated from each means for managing and storing the information, the amount of LNG for power generation can be calculated appropriately and quickly. That is, it becomes possible to grasp the LNG amount for power generation appropriately and in real time based on the appropriate and latest information on the LNG possession amount and the usage amount outside power generation.

  According to the second and seventh aspects of the invention, the number of days that can be generated is calculated based on the calculated amount of LNG for power generation and the load factor of power generation. That is, since the number of days that can be generated is calculated based on the amount of LNG for power generation that is appropriately calculated in real time as described above, the number of days that can be generated can be grasped appropriately and in real time.

  According to the third aspect of the present invention, based on the calculated number of days that can be generated and the number of days required for receiving LNG, the day on which LNG should be requested (the day on which LNG should be ordered) is determined. . In other words, since the day on which LNG acceptance should be requested is determined based on the number of days that can be generated appropriately and in real time as described above, it is possible to grasp the day on which acceptance is requested properly and in real time. It becomes possible.

  In addition, as described above, it is not necessary to manually calculate and determine the amount of LNG for power generation, the number of days that can be generated, and the day on which LNG reception should be requested, and labor and time can be reduced.

  According to the fourth aspect of the present invention, the LNG possession amount is managed and stored based not only on the LNG amount actually held (existing) but also on the LNG amount planned to be accepted. That is, since the LNG amount for power generation and the number of days that can be generated are calculated based on the LNG amount currently and in the future, more appropriate calculation can be performed.

  According to the fifth aspect of the present invention, the usage amount outside power generation is managed and stored based on the past performance data. For this reason, the calculation of the amount of LNG for power generation and the number of days that can be generated in accordance with the past results is performed, and more appropriate calculation is possible.

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of an LNG management system 1 according to this embodiment. The LNG management system 1 is a system that manages the amount of LNG held and used (consumption) in a power plant (LNG power plant), and mainly includes a possession server (retention amount management means) 2, An outside server (power generation outside use management means) 3 and a power generation server (power generation management means) 4 are provided, and these are connected to each other via a communication network (not shown).

  The possession amount server 2 is a server that manages and stores the LNG possession amount in the power plant, and is disposed in a department that manages the LNG possession amount. The possessed amount server 2 manages and stores the LNG retained amount based on the LNG amount actually retained in the LNG tank 5 and the LNG amount planned to be received. Specifically, the LNG possession amount is managed and stored based on the flowchart shown in FIG. First, a level value is periodically received from a level detector (not shown) disposed in each LNG tank 5 and detecting an LNG storage level (depth) in the LNG tank 5 (step S1). Next, the amount of LNG actually held (remaining) in each LNG tank 5 is calculated based on this level value (step S2). That is, the LNG amount is calculated from the relational expression and the relationship graph between the level value and the LNG amount (volume). Here, since the unit of the calculated LNG amount is kiloliter (volume), it is converted to ton (weight) (step S3). That is, the calculated amount of LNG (volume) in each LNG tank 5 is multiplied by the specific gravity of LNG in each LNG tank 5 to be converted into a weight. Here, the specific gravity of the LNG in each LNG tank 5 is stored in the possession amount server 2 when the LNG is received. Subsequently, the LNG weight in each LNG tank 5 is integrated to calculate the total amount of LNG remaining in the power plant (step S4), and the result is stored in the memory (step S5).

  On the other hand, information that is planned to be accepted by LNG is sequentially input and transmitted to the possession amount server 2. That is, when the LNG ship port entry plan table as shown in FIG. 3 is created, this plan table is input or transmitted to the possession amount server 2 (step S6) and stored in the memory (step S7). Also, when there is a change in the acceptance plan, a new LNG ship entry plan table is input or transmitted and stored. Here, it is assumed that the amount of LNG received in a single acceptance is constant, and a certain amount of LNG received is added to the above-mentioned total amount of LNG to become the amount of LNG retained on the scheduled port entry date in the LNG ship port entry plan table. Then, as will be described later, in response to a data request from the power generation server 4, the remaining amount of LNG at that time and the LNG ship port entry plan table are transmitted to the power generation server 4.

  The non-power generation server 3 is a server that manages and stores the amount of LNG used other than power generation (amount of power used outside power generation), and is disposed in a department that supplies (sells) LNG to the outside. That is, in this embodiment, the supply of LNG to other than power generation is performed through the tank truck 6 and the pipeline 7. A flow tank (not shown) is provided in the tank tank 8 for supplying LNG to the tank lorry 6 and the pipeline 7, and measurement data (supply amount) is transmitted from each flow meter to the non-power generation server 3. It has come to be. Thereby, the supply amount to the outside is integrated in the non-power generation server 3, and the usage amount outside the power generation is managed and stored as past performance data. Further, in this embodiment, the monthly average non-power generation usage for the past three months is sequentially calculated, and, as will be described later, in response to a data request from the power generation server 4, The usage amount is transmitted to the power generation server 4.

  The power generation server 4 is a server that calculates the amount of LNG that can be used for power generation (the amount of LNG for power generation), and is disposed in a department that manages and operates the power generation facility 9. As shown in FIG. 4, the power generation server 4 includes a gas amount calculation task 41, a power generation day calculation task 42, a requested date indexing task 43, and a control task 44 that controls these operations.

  The gas amount calculation task 41 is a task for calculating the power generation LNG amount based on the LNG possessed amount and the non-power generation usage amount, and is based on the flowchart shown in FIG. First, a data request is transmitted to the possession amount server 2 (step S11), and the total LNG remaining amount and the LNG ship port entry plan table are received from the possession amount server 2 (step S12). Similarly, a data request is transmitted to the non-power generation server 3 (step S13), and the monthly average non-power generation usage as described above is received from the non-power generation server 3 (step S14). Next, the monthly average non-power generation usage is subtracted from the total LNG remaining amount (step S15), and it is determined whether or not LNG is received within one month from the present time based on the LNG ship entry plan table (step S16). ). When there is acceptance, the amount of LNG for power generation is calculated by adding the amount of LNG accepted according to the number of times of acceptance (step S17).

LNG amount for power generation = total remaining amount of LNG−monthly average amount of use outside power generation + LNG received amount Subsequently, the calculated power generation LNG amount is stored in a memory (step S18). Thus, in this embodiment, the amount of LNG for power generation within one month from the present time is calculated.

The power generation days calculation task 42 is a task for calculating the number of days that can be generated based on the calculated power generation LNG amount and the power generation load factor (power generation conditions), and is based on the flowchart shown in FIG. First, the power generation LNG amount is acquired from the memory (step S21), and the power generation load factor is acquired (step S22). Here, the load factor of power generation is a value input and registered in advance, and a plurality of load factors can be input and registered. Furthermore, the LNG consumption per day when the load factor is 100% (hereinafter referred to as “consumption at full load”) is acquired from the memory (step S23). This full load consumption is a value stored based on past performance data. Next, the number of days that can be generated is calculated according to the following equation (step S24).
Number of days that can be generated = amount of LNG for power generation ÷ (consumption at full load x load factor / 100)

Subsequently, a graph showing the relationship between the number of operating days (the number of working days) from the current time and the remaining predicted amount of LNG is created according to the following equation (step S25).
Remaining predicted amount = LNG amount for power generation-(consumption at full load x load factor / 100) x number of working days

  Here, for example, three values of 100%, 80%, and 60% are registered as the load factor of power generation. For these three load factors, the number of days that can be generated and a graph are calculated. create. Thereby, for example, a graph as shown in FIG. 7 is created. Then, the calculated and created power generation days and graph are stored in the memory (step S26).

The requested date indexing task 43 is a task for determining a date (requested date for LNG) that should be requested to receive LNG based on the calculated number of days that can be generated and the number of days required for receiving LNG. In other words, the number of days required to receive LNG, that is, the number of days from when LNG is received (ordered) to when LNG can be obtained is stored in advance in memory, and this number of days is subtracted from the number of days that can be generated as shown in the following equation. The day that should be requested is the sum of the number of days added to the current day.
LNG request date = current date + (number of days that can be generated-number of days required for acceptance)

  Thus, in this embodiment, the acceptance of LNG is determined so that LNG is accepted on the day when the remaining predicted amount of LNG becomes zero. And the following can be grasped | ascertained by calculating | requiring the request | requirement date of LNG in this way. In other words, if the number of days that can be generated is less than the number of days required for acceptance, that is, if the LNG request date is earlier than the current date, the amount of LNG held (remaining amount) before accepting LNG Disappear. For this reason, it is understood that it is necessary to change the power generation load, change (reduce) the amount of LNG used for other than power generation, or make an urgent request for LNG. In addition, it is confirmed whether or not an LNG request is actually made before the determined LNG request date. In other words, based on the LNG ship port entry plan table, it is confirmed whether or not the next LNG is accepted during the number of days that can be generated from the current date. If the next LNG is not accepted, It is understood that a change or a change in LNG usage other than power generation is necessary.

  Next, the processing operation of the LNG management system 1 having such a configuration will be described based on the flowchart shown in FIG.

  First, as described above, the LNG possession amount in the power plant is sequentially managed and stored in the possession amount server 2 (step S31), and the non-power generation use amount is sequentially managed and stored in the non-power generation server 3. (Step S32). Next, when the gas amount calculation task 41 is activated in the power generation server 4 (step S33), a data request is transmitted to the possessed amount server 2 and the non-power generation server 3 as described above (step S34). Then, when the LNG possessed amount from the retained amount server 2 (step S35) and the monthly average out-of-power generation usage from the non-power generation server 3 are received (step S36), the LNG amount for power generation is obtained as described above. Calculated (step S37). Subsequently, the power generation days calculation task 42 is activated (step S38), and the days and graphs in which power generation is possible are calculated and created as described above (step S39). Furthermore, the requested date indexing task 43 is activated (step S40), and the date on which the LNG acceptance should be requested is determined as described above (step S41).

  As described above, according to the LNG management system 1, based on the LNG possessed amount managed and stored by the retained amount server 2 and the out-of-power generation usage managed and stored by the non-power-generation server 3, The amount of LNG for power generation is calculated by the gas amount calculation task 41 of the power generation server 4. Thus, in order to receive and calculate information necessary for calculating the power generation LNG amount from the servers 2 and 3 that sequentially manage and store the information, the power generation LNG amount can be calculated appropriately and quickly. Can do. That is, it becomes possible to grasp the LNG amount for power generation appropriately and in real time based on the appropriate and latest information on the LNG possession amount and the usage amount outside power generation.

  Further, the power generation days calculation task 42 calculates the days that can be generated based on the calculated power generation LNG amount. That is, since the number of days that can be generated is calculated based on the amount of LNG for power generation that is appropriately calculated in real time as described above, the number of days that can be generated can be grasped appropriately and in real time. Further, the requested date indexing task 43 determines the date on which the LNG acceptance should be requested based on the calculated number of days that can be generated. In other words, since the day on which LNG acceptance should be requested is determined based on the number of days that can be generated appropriately and in real time as described above, it is possible to grasp the day on which acceptance is requested properly and in real time. It becomes possible. In addition, as described above, it is not necessary to manually calculate and determine the amount of LNG for power generation, the number of days that can be generated, and the day on which LNG reception should be requested, and labor and time can be reduced.

  On the other hand, in the possession amount server 2, the LNG possession amount is managed and stored based not only on the LNG amount actually retained but also on the LNG amount planned to be accepted. That is, since the LNG amount for power generation and the number of days that can be generated are calculated based on the LNG amount currently and in the future, more appropriate calculation can be performed. Further, the non-power generation server 3 manages and stores the non-power generation usage based on the past performance data. For this reason, the calculation of the amount of LNG for power generation and the number of days that can be generated in accordance with the past results is performed, and more appropriate calculation is possible.

  As described above, since it is possible to grasp the amount of LNG for power generation and the number of days in which power can be generated appropriately and in real time, an accurate operation plan (power generation plan) can be established. That is, the LNG management system 1 sends the amount of LNG for power generation, the number of days that can be generated, and the like to a central power supply command station that sends an output command to the power generation equipment 9. This makes it possible to make an accurate operation plan from the fuel level at a central power supply command center, etc., or to make a quick and appropriate operation plan when changing the operation plan due to troubles occurring at other power stations, etc. Is possible. In addition, if the LNG management system 1 sends the amount of LNG for power generation or the number of days that can be generated to the department that makes the LNG procurement plan, it will be accepted when it becomes necessary to accept LNG on a one-off basis (at the spot). It is possible to make a day plan quickly and appropriately.

(Embodiment 2)
FIG. 9 is a schematic block diagram of the LNG management program 11 according to this embodiment. This LNG management program 11 is a program for managing the amount of LNG held and used at the power plant, and manages the amount of LNG held at the power plant and the storage management means for storing the amount of LNG held at the power plant. Based on the LNG usage management means that manages and stores the LNG usage, the LNG possessed quantity by the possession management means, and the LNG usage by the non-power usage management means, the LNG quantity that can be used for power generation is calculated. This is a program for functioning as a power generation management means.

  Specifically, in the possession amount management task 12 as the possession amount management means, similarly to the possession amount server 2, based on the level value received from the level detector of each LNG tank 5 and the LNG ship port entry plan table. Manage and store LNG holdings. Further, in the non-power generation use management task 13 as the non-power generation use management means, the past generation results are used based on the measurement data received from the flow meter of the pipeline 7 as in the non-power generation server 3. Manage and store as data. Then, in the gas amount calculation task (power generation management means) 14, similarly to the gas amount calculation task 41, based on the LNG possessed amount from the retained amount management task 12 and the non-power generation use amount from the non-power generation use management task 13. Then, the power generation LNG amount is calculated. Further, in the power generation days calculation task (power generation management means) 15, similarly to the power generation days calculation task 42, the number of days that can be generated is calculated based on the calculated power generation LNG amount and the power generation load factor. Further, the requested day indexing task (power generation management means) 16 requests the acceptance of LNG based on the calculated number of days that can be generated and the number of days required for the acceptance of LNG, as with the requested day indexing task 43. The day to be determined. These tasks 12 to 16 are activated and controlled by the control task 17.

  By installing such an LNG management program 11 on a central power supply command center computer or general-purpose computer, the amount of LNG for power generation, the number of days that can be generated, and the day on which LNG acceptance should be requested are determined. It becomes possible to grasp. In addition, it can be installed easily and quickly because it only needs to be installed on a computer at the central power supply command station.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the amount of LNG for power generation within one month from the present time is calculated, and the number of days that can be generated is calculated based on this amount. However, all planned LNG acceptances are taken into account. Then, a relationship graph between the number of working days and the remaining predicted amount of LNG may be created. That is, using the current total LNG remaining amount as a starting point, the daily average usage amount outside power generation and the LNG consumption amount for power generation (consumption amount at full load × load factor / 100) are subtracted every day. Then, a certain LNG acceptance amount is added to the scheduled port entry date in the LNG ship entry plan table to create a relationship graph as shown in FIG. As a result, it is possible to easily grasp the remaining predicted amount according to the LNG ship port entry plan table, and to easily and revisit the LNG acceptance plan.

  In addition, the non-power generation server 3 manages and stores the non-power generation usage based on the past performance data, but based on the external sales plan to supply (external sales) to the outside via the tank truck 6 or the pipeline 7, That is, the usage amount outside power generation may be managed and stored based on future external sales information. Furthermore, the possession amount server 2 and the non-power generation server 3 may be a single server, or the servers 2 to 4 may be a single server.

It is a schematic block diagram of the LNG management system which concerns on Embodiment 1 of this invention. 3 is a flowchart showing a procedure for managing and storing the LNG possession amount in the power plant in the possession amount server of the LNG management system of FIG. 1. It is a figure which shows one example of the LNG ship port entry schedule table received in FIG. It is a block diagram which shows the task structure of the electric power generation server of the LNG management system of FIG. It is a flowchart of the gas amount calculation task of the power generation server of FIG. 5 is a flowchart of a power generation day calculation task of the power generation server of FIG. 4. It is a figure which shows an example of the graph produced in FIG. It is a flowchart which shows the processing operation of the LNG management system of FIG. It is a block diagram which shows the task structure of the LNG management program which concerns on Embodiment 2 of this invention. It is a figure which shows the other example of the relationship graph of the working days in this invention, and the residual prediction amount of LNG.

Explanation of symbols

1 LNG management system 2 Retention server (retention management means)
3 Non-power generation server (use management outside power generation)
4 Power generation server (power generation management means)
41 Gas amount calculation task 42 Power generation days calculation task 43 Request date indexing task 44 Control task 5 LNG tank 6 Tank lorry 7 Pipeline 8 Tank for lorry 9 Power generation facility 11 LNG management program

Claims (7)

An LNG management system for managing the amount of LNG held and used at a power plant,
Holding amount management means for managing and storing the LNG holding amount in the power plant;
Non-power generation use management means for managing and storing LNG usage other than power generation,
Power generation management means for calculating the amount of LNG that can be used for power generation based on the amount of LNG possessed acquired from the possession amount management means and the amount of LNG usage other than power generation acquired from the non-power generation use management means. An LNG management system comprising:   2. The LNG management system according to claim 1, wherein the power generation management unit calculates the number of days that can be generated based on the calculated amount of LNG that can be used for the power generation and a load factor of power generation.   3. The LNG management system according to claim 2, wherein the power generation management unit calculates a date on which LNG acceptance is requested based on the calculated number of days that can be generated and the number of days required to accept LNG. .   The holding amount management means manages and stores the LNG holding amount based on the LNG amount actually held and the LNG amount planned to be received. The LNG management system according to item.   The LNG management system according to any one of claims 1 to 4, wherein the non-power generation use management means manages and stores an LNG usage amount other than the power generation based on past performance data. An LNG management program for managing the amount of LNG held and used at a power plant,
Holding amount management means for managing and storing the LNG holding amount in the power plant;
Non-power generation use management means for managing and storing LNG usage other than power generation,
An LNG management program for functioning as a power generation management unit that calculates an LNG amount that can be used for power generation based on an LNG possession amount by the possession amount management unit and an LNG usage amount by the non-power generation use management unit. The LNG management program according to claim 6, wherein the power generation management means calculates the number of days that can be generated based on the calculated amount of LNG that can be used for the power generation and a load factor of power generation.

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