JP2020056465A - Lng satellite facility - Google Patents

Abstract

To provide an LNG satellite facility capable of starting operation of a power generation device and continuing the operation even if power supply from a power system is stopped for a long time.SOLUTION: The present invention relates to an LNG satellite facility comprising a fuel gas supply unit 30 for supplying a fuel gas containing a natural gas obtained by vaporizing LNG to a power generation device 11, and the power generation device 11. The LNG satellite facility comprises an auxiliary power supply device 20 which includes a power storage unit 21 and is capable of supplying power for activating the power generation device 11 to the power generation device 11. The fuel gas supply unit 30 includes a vaporizing section 36 for vaporizing LNG and a heat supply section 31 for supplying heat to the vaporizing section 36. A power supply switching device 8 supplies power being supplied from an AC line 2 to the vaporizing section 36 in a case that power is being supplied from at least one of a power system 1 and the power generation device 11 to the AC line 2, and supplies power being supplied from the auxiliary power supply device 20 to the vaporizing section 36 in a case that power is not being supplied from both the power system 1 and the power generation device 11 to the AC line 2.SELECTED DRAWING: Figure 1

Description

  The present invention provides a fuel gas supply unit that supplies a fuel gas including natural gas obtained by vaporizing LNG to a power generation device, a power generation device that consumes fuel gas supplied from the fuel gas supply unit to generate power, The present invention relates to an LNG satellite facility including an AC line to which power is supplied from at least one of a power system and a power generator.

  From an LNG receiving terminal that receives an LNG tanker that transports LNG (liquefied natural gas), LNG is transported to an LNG satellite terminal using, for example, an LNG lorry, and a gas having a desired calorie is produced at the LNG satellite terminal. Have been done. The LNG satellite facility including the devices provided at the LNG satellite base includes a fuel gas supply unit that supplies a fuel gas including natural gas obtained by vaporizing LNG to a power generation device, and a fuel gas supply unit that supplies the fuel gas from the fuel gas supply unit. There is a case where a power generation device that consumes fuel gas to generate power is installed. If such a power generation device can be operated while the power system is out of power, some LNG is installed in the LNG satellite base while evaporating LNG even during a power outage in the power system. Power can be supplied to the power load.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-144877) describes a facility in which a cogeneration system as a power generation device is installed at an LNG satellite base. This cogeneration system operates by consuming natural gas obtained by vaporizing LNG supplied from a tank lorry that transports LNG, and supplies heat and power generated by the cogeneration system to the LNG satellite base.

In the facility described in Patent Literature 1, as a vaporizing unit for vaporizing LNG at an LNG satellite base, a hot water type using heat generated in a cogeneration system is provided. Although not described in Patent Literature 1, a pump for circulating hot water, and electrical equipment such as a solenoid valve for opening and closing the flow path of LNG and gas are necessary. Power is required.
In addition, a boiler that heats a heat medium by using heat of combustion of gas may be provided at an LNG satellite base, and a vaporization unit that vaporizes LNG by heat of the heat medium heated by the boiler may be used. Even in such a vaporization section, electrical equipment such as a solenoid valve for opening and closing the flow path of LNG and gas is required. In addition, the boiler as described above requires electric power to operate a fan or the like that supplies air used for gas combustion to the boiler, and to operate a pump that flows a heat medium.

JP 2008-144877 A

  If a power failure occurs in the power system that supplies power to the LNG satellite base, even if a power supply for starting the power generator is provided, power cannot be supplied to the fuel gas supply unit including the vaporization unit. As a result, the fuel gas cannot be supplied to the power generation device, and the power generation device cannot be started or the operation cannot be continued during a power outage of the power system.

  It is not possible to provide an emergency generator or an uninterruptible power supply for supplying power to the fuel gas supply unit and supply power to the fuel gas supply unit in the event of a power failure in the power system. is there. However, the installation of an emergency generator increases the size of the equipment, raises the cost, and requires continuous maintenance and management. However, there is a problem that the size becomes large and the cost increases.

  Therefore, even if an uninterruptible power supply that can supply power to the fuel gas supply unit is installed, installing an uninterruptible power supply that can supply power for a short time is a practical measure against power outages in the power system. It is considered to be. In this case, if the power generator is started in a short time after a power failure occurs in the power system, the LNG is vaporized by the vaporization unit of the fuel gas supply unit operated by the power supplied from the uninterruptible power supply. It is possible to supply fuel gas including natural gas that has been converted to gas to the power generation device.

  However, even if fuel gas can be supplied to the power generator, the power generator may not be able to be started early due to a problem on the power generator side. For example, when starting a power generator under a situation where a power outage occurs in the power system, if a procedure such as operating a circuit breaker to switch a power supply path to a power load is required before such a starter, such a circuit breaker may be used. Operation takes time, and the power generator may not be able to be started early. Further, when the power generation device has an engine that operates by consuming fuel gas and a generator driven by the engine, if an abnormality such as knocking or misfire of the engine occurs, the power generation device cannot be started early. There is a possibility.

  Then, if the power generator cannot be started early (for example, within the available power supply time of the uninterruptible power supply) after a power outage occurs in the power system, the supply of power from the uninterruptible power supply on the fuel gas supply unit side is also stopped. When the operation is not performed (that is, the electromagnetic valve or the like cannot operate), the fuel gas cannot be supplied to the power generation device. In addition, since the supply of power from the uninterruptible power supply device is not performed on the fuel gas supply unit side, the fuel gas supply unit is in a state of severe failure stop (for example, an emergency shut-off valve provided in the LNG or gas flow path is not provided). To the closed state). In this case, even if the power generator can be started using the power supply for starting, the fuel gas supply unit does not resume the operation, so that the fuel gas is not supplied to the power generator and the power generator cannot continue operating.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an LNG that can start the operation of a power generator and continue the operation even when the power supply from the power system is stopped for a long time. The point is to provide satellite facilities.

In order to achieve the above object, the characteristic configuration of the LNG satellite facility according to the present invention includes a fuel gas supply unit that supplies a fuel gas including natural gas obtained by vaporizing LNG to a power generation device, and a fuel gas supply unit. An LNG satellite facility comprising: the power generation device that generates power by consuming a supplied fuel gas; and an AC line to which power is supplied from at least one of a power system and the power generation device,
An auxiliary power supply device that has a power storage unit connected to the AC line, stores power supplied to the AC line in the power storage unit, and can supply power for starting the power generation device to the power generation device. Prepared,
The fuel gas supply unit includes a vaporization unit that retains supplied heat and vaporizes LNG by a temperature difference between the retained heat and LNG, and a heat supply unit that supplies heat to the vaporization unit. The heat supply unit operates by receiving power supply from the AC line, and the vaporization unit is configured to operate by receiving power supply from a power supply switching device connected to a plurality of power supply sources,
The power supply switching device, when power is supplied to the AC line from at least one of the power system and the power generator, supplies power supplied from the AC line as the power supply source to the vaporization unit. When power is not supplied to the AC line from both the power system and the power generation device, power supplied from the auxiliary power supply device serving as the power supply source is supplied to the vaporization unit. On the point.

  According to the above-described characteristic configuration, when power is supplied to the AC line from at least one of the power system and the power generation device, power is supplied from the AC line to the heat supply unit of the fuel gas supply unit, Electric power is supplied to the vaporizing section from an AC line via a power supply switching device. In other words, the vaporization section of the fuel gas supply section can continuously vaporize LNG using the heat supplied from the heat supply section. As a result, the power generation device can continue the operation by consuming the fuel gas continuously supplied from the fuel gas supply unit.

  When power is not supplied from both the power system and the power generator to the AC line, that is, for example, even when a power failure or the like occurs in the power system and the operation of the power generator is stopped, the vaporizing unit is The operation can be performed using the electric power supplied through the power supply switching device from the auxiliary power supply device that can supply the electric power for starting the power generation device. Therefore, even if it is not possible to continuously supply heat from the heat supply unit to the vaporization unit because the heat supply unit cannot operate because power is not supplied from the AC line, the temperature of the heat and the LNG held by the vaporization unit is maintained. As long as there is a difference, fuel gas including natural gas obtained by vaporizing LNG is supplied to the power generation device. As a result, the power generator starts operating by consuming fuel gas supplied from the fuel gas supply unit even in a situation in which a power failure or the like occurs in the power system and the operation of the power generator is stopped. The operation can be continued even temporarily.

As described above, in the present characteristic configuration, even when a power failure or the like occurs in the power system and the operation of the power generation device is stopped, the operation of the power generation device is started and the operation is temporarily performed. Is continued, a situation is created in which power is supplied from the power generator to the AC line. As a result, electric power is supplied from the AC line to the heat supply unit of the fuel gas supply unit, so that heat is continuously supplied from the heat supply unit to the vaporization unit, and the supplied heat is supplied to the fuel gas supply unit. LNG is continuously vaporized in the vaporizing section by using. Then, since the fuel gas is continuously supplied from the fuel gas supply unit to the power generation device, the power generation device can continue to operate and continuously supply power to the AC line.
Therefore, even if the power supply from the power system is stopped for a long time, it is possible to provide an LNG satellite facility that can start the operation of the power generator and continue the operation.

Another characteristic configuration of the LNG satellite facility according to the present invention, wherein the fuel gas supply unit has a boil-off gas supply unit that supplies boil-off gas generated in an LNG storage tank to the power generation device as the fuel gas,
The boil-off gas supply unit is configured to operate by receiving power supply from the power supply switching device, and the power supply switching device is supplied with power from at least one of the power system and the power generation device to the AC line. In this case, the power supplied from the AC line as the power supply source is supplied to the vaporization unit and the boil-off gas supply unit, and the AC line is supplied with power from both the power system and the power generation device. When there is no power supply source, the power supplied from the auxiliary power supply device as the power supply source is supplied to the vaporization unit and the boil-off gas supply unit.

  According to the above-described characteristic configuration, when power is not supplied to the AC line from both the power system and the power generation device, that is, for example, a power outage occurs in the power system and the operation of the power generation device is stopped. Even so, the vaporization unit and the boil-off gas supply unit can operate using the electric power supplied via the power supply switching device from the auxiliary power supply device that can supply the electric power for starting the power generation device. Therefore, as described above, not only can the natural gas vaporized in the vaporization section be supplied to the power generation device, but also the boil-off gas can be supplied from the boil-off gas supply portion to the power generation device. Therefore, even if the amount of gas that can be supplied from the vaporization section to the power generation device is small, the gas supplied from the boil-off gas supply portion can at least partially cover the amount of fuel gas required by the power generation device.

Still another characteristic configuration of the LNG satellite facility according to the present invention includes a fuel gas supply unit that supplies a fuel gas including natural gas obtained by vaporizing LNG to a power generation device, and a fuel supplied from the fuel gas supply unit. An LNG satellite facility including the power generation device that generates power by consuming gas, and an AC line to which power is supplied from at least one of a power system and the power generation device,
An auxiliary power supply device that has a power storage unit connected to the AC line, stores power supplied to the AC line in the power storage unit, and can supply power for activating the power generation device to the power generation device; ,
An uninterruptible power supply connected to the AC line and the auxiliary power supply and capable of receiving power supply from at least one of the AC line and the auxiliary power supply;
The fuel gas supply unit includes a vaporization unit that retains supplied heat and vaporizes LNG by a temperature difference between the retained heat and LNG, and a heat supply unit that supplies heat to the vaporization unit. The heat supply unit operates by receiving power supply from the AC line, and the vaporization unit operates by receiving power supply via the uninterruptible power supply.

  According to the above-described characteristic configuration, when power is supplied to the AC line from at least one of the power system and the power generation device, power is supplied to the heat supply unit of the fuel gas supply unit from the AC line. Further, since power is supplied from the AC line to the uninterruptible power supply, power is continuously supplied from the uninterruptible power supply to the vaporization unit of the fuel gas supply unit. In other words, the vaporization section of the fuel gas supply section can continuously vaporize LNG using the heat supplied from the heat supply section. As a result, the power generation device can continue the operation by consuming the fuel gas continuously supplied from the fuel gas supply unit.

  When power is not supplied from both the power system and the power generator to the AC line, that is, for example, even when a power failure or the like occurs in the power system and the operation of the power generator is stopped, the vaporizing unit is It can operate by receiving supply of power stored in the uninterruptible power supply. Further, since power is also supplied from the auxiliary power supply to the uninterruptible power supply, power is continuously supplied to the vaporization unit from the uninterruptible power supply. Therefore, even if it is not possible to continuously supply heat from the heat supply unit to the vaporization unit because the heat supply unit cannot operate because power is not supplied from the AC line, the temperature of the heat and the LNG held by the vaporization unit is maintained. As long as there is a difference, fuel gas including natural gas obtained by vaporizing LNG is supplied to the power generation device. As a result, the power generator starts operating by consuming fuel gas supplied from the fuel gas supply unit even in a situation in which a power failure or the like occurs in the power system and the operation of the power generator is stopped. The operation can be continued even temporarily.

As described above, even in a situation where a power outage or the like occurs in the power system and the operation of the power generation device is stopped, it is possible to start the operation of the power generation device and continue the operation even temporarily. This creates a situation in which power is supplied from the power generator to the AC line. As a result, electric power is supplied from the AC line to the heat supply unit of the fuel gas supply unit, so that heat is continuously supplied from the heat supply unit to the vaporization unit, and the supplied heat is supplied to the fuel gas supply unit. LNG is continuously vaporized in the vaporizing section by using. Then, since the fuel gas is continuously supplied from the fuel gas supply unit to the power generation device, the power generation device can continue to operate and continuously supply power to the AC line.
Therefore, even if the power supply from the power system is stopped for a long time, it is possible to provide an LNG satellite facility that can start the operation of the power generator and continue the operation.

Still another characteristic configuration of the LNG satellite facility according to the present invention, wherein the fuel gas supply unit has a boil-off gas supply unit that supplies boil-off gas generated in an LNG storage tank to the power generation device as the fuel gas,
The boil-off gas supply unit is configured to operate by receiving power supply via the uninterruptible power supply.

  According to the above-described characteristic configuration, when power is not supplied to the AC line from both the power system and the power generation device, that is, for example, a power outage occurs in the power system and the operation of the power generation device is stopped. Even so, the vaporization unit and the boil-off gas supply unit can operate using the electric power supplied from the uninterruptible power supply. Furthermore, even if the power stored in the uninterruptible power supply is lost, the vaporizing unit and the boil-off gas supply unit can operate using the electric power supplied from the auxiliary power supply via the uninterruptible power supply. Therefore, as described above, not only can the natural gas vaporized in the vaporization section be supplied to the power generation device, but also the boil-off gas can be supplied from the boil-off gas supply portion to the power generation device. Therefore, even if the amount of gas that can be supplied from the vaporization section to the power generation device is small, the gas supplied from the boil-off gas supply portion can at least partially cover the amount of fuel gas required by the power generation device.

  Still another characteristic configuration of the LNG satellite facility according to the present invention is that, when power supply from the power system to the AC line is stopped, the power generation device stops power generation and then supplies power from the auxiliary power supply device. In that it is configured to resume power generation by operating using the.

  According to the above-described characteristic configuration, even when the power supply from the power system to the AC line is stopped, the power generation device can automatically restart the power generation by operating using the power supplied from the auxiliary power supply device. Thereby, the state in which the power is supplied to the AC line can be restored.

  Still another characteristic configuration of the LNG satellite facility according to the present invention is a storage that can temporarily store fuel gas in a gas flow path through which fuel gas supplied from the fuel gas supply unit to the power generation device passes. The point is that a fuel gas storage unit having a space is provided.

  According to the above characteristic configuration, a sufficient amount of fuel gas can be supplied from the fuel gas storage unit to the power generation device even if the amount of natural gas vaporized in the vaporization unit is small. Further, even if the amount of gas supplied from the fuel gas supply unit per unit time fluctuates, the fluctuation is alleviated in the fuel gas storage unit, and it is difficult to transmit the fluctuation to the power generator.

  Yet another characteristic configuration of the LNG satellite facility according to the present invention is that the heat supply unit is configured to resume operation when power supply to the AC line is resumed.

  According to the above configuration, when the power supply to the AC line is restarted, the heat supply unit operates by receiving the power supply from the AC line and continuously supplies heat to the vaporization unit. Can be. As a result, the vaporization of LNG in the vaporization section is performed using the heat continuously supplied from the heat supply section.

Yet another characteristic configuration of the LNG satellite facility according to the present invention is that the vaporization unit transfers heat from the heat supply unit to the vaporization unit because the heat supply unit cannot operate because power is not supplied from the AC line. Even if it is not possible to supply continuously, it is configured to have a heat medium capable of retaining heat capable of vaporizing LNG and generating a predetermined amount of natural gas,
The predetermined amount is a point corresponding to the amount of natural gas as the fuel gas consumed by the power generation device until the power generation device is activated and the generated power can be supplied to the AC line. is there.

  According to the above configuration, even when heat cannot be continuously supplied from the heat supply unit to the vaporization unit, LNG is vaporized by the heat held by the heat medium included in the vaporization unit, and the power generation device is started. Then, the amount of natural gas consumed by the power generator before the generated power can be supplied to the AC line can be generated.

It is a figure explaining the schematic structure of the LNG satellite equipment of a 1st embodiment. FIG. 3 is a diagram illustrating a state in which power is supplied to the AC line from at least one of a power system and a power generator. It is a figure showing the state where electric power is not supplied to an alternating current line from both a power system and a power generator. It is a figure which shows the specific example of LNG satellite equipment. FIG. 2 is a diagram illustrating a state immediately after a power failure occurs in a power system. It is a figure showing the state after starting of a power generator. FIG. 7 is a diagram illustrating a state after power supply from the power system is restarted. It is a figure showing the state where the power generator was reconnected to the power system. It is a figure explaining the schematic structure of the LNG satellite equipment of a 2nd embodiment. It is a figure showing the example of composition of the fuel gas supply part of a 2nd embodiment. It is a figure explaining the schematic structure of the LNG satellite equipment of a 3rd embodiment.

<First embodiment>
Hereinafter, an LNG satellite facility according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a schematic configuration of the LNG satellite facility of the first embodiment. LNG is transported to an LNG satellite base provided with LNG satellite facilities from an LNG receiving base that receives an LNG tanker that transports LNG (liquefied natural gas) using, for example, an LNG lorry. As shown in the drawing, the LNG satellite facility consumes a fuel gas supply unit 30 that supplies a fuel gas containing natural gas obtained by vaporizing LNG to the power generation device 11 and a fuel gas supplied from the fuel gas supply unit 30. A power generator 11 for generating electric power, and an AC line 2 to which power is supplied from at least one of the power system 1 and the power generator 11.

  In the example shown in FIG. 1, an important power load 3 and a general power load 4 are connected to the AC line 2. Specifically, the AC line 2 is connected to the power system 1 via a circuit breaker A, the important power load 3 is connected to the AC line 2 via a circuit breaker C, and the general power load 4 is via a circuit breaker D. Connected to the AC line 2. The important power load 3 is, for example, a main lighting device, a server device, a communication device, instruments, and the like. The general power load 4 is a lighting device or the like that may be turned off when the power system 1 loses power. Note that among the power loads provided at the LNG satellite base, which power load is the important power load 3 and which power load is the general power load 4 can be appropriately set.

  The fuel gas supply unit 30 retains the supplied heat and vaporizes LNG by a temperature difference between the retained heat and LNG; a heat supply unit 31 that supplies heat to the vaporization unit 36; Having. The heat supply unit 31 operates by receiving power supply from the AC line 2. The vaporization unit 36 has, for example, an electromagnetic valve for opening and closing the flow path of LNG and gas, and operates by receiving power supply from the power supply switching device 8 connected to a plurality of power supply sources.

  The power generation device 11 includes an engine 11a that operates by consuming fuel gas supplied from the fuel gas supply unit 30, and a generator 11b driven by the engine 11a. The generator 11b is connected to the AC line 2. The electric power generated by the generator 11b is supplied to the AC line 2.

  The LNG satellite facility includes an auxiliary power supply device 20 connected to the AC line 2. Auxiliary power supply device 20 has power storage unit 21 connected to AC line 2, stores power supplied to AC line 2 in power storage unit 21, and supplies power for starting power generation device 11 to power generation device 11. Can be supplied. For example, the auxiliary power supply device 20 is a device provided in association with the power generation device 11. For this reason, it is preferable that the power storage unit 21 has a capacity that can sufficiently supply the power required to start the power generation device 11 at the time of a power outage in which the power supply from the power system 1 is stopped, for example.

  The LNG satellite facility includes a power supply switching device 8. The power supply switching device 8 operates to automatically switch the power supply source for the vaporization unit 36 of the fuel gas supply unit 30 to one of the AC line 2 and the auxiliary power supply device 20. For example, the power supply switching device 8 includes a contact a connected to the AC line 2, a contact b connected to the auxiliary power supply 20, and a contact c connected to the vaporization unit 36 of the fuel gas supply unit 30. The contacts a to c are not limited to those that can be switched between physical contact and non-contact, and may be those that can be switched between conductive and non-conductive using, for example, a semiconductor element. When power is supplied from the AC line 2 to the contact a, the power supply switching device 8 conducts the contact a and the contact c (that is, the AC line is connected to the vaporizing unit 36 of the fuel gas supply unit 30). 2 when the power is supplied from the AC line 2 to the contact a, and the contact b and the contact c are connected to each other when the power is not supplied from the AC line 2 (that is, the vaporization unit of the fuel gas supply unit 30). 36 is supplied with power from the auxiliary power supply 20).

  That is, when power is supplied to the AC line 2 from at least one of the power system 1 and the power generator 11, the power supply switching device 8 supplies the power supplied from the AC line 2 as a power supply source to the vaporization unit 36. I do. As a result, when power is supplied to the AC line 2 from at least one of the power system 1 and the power generator 11, the heat supply unit 31 of the fuel gas supply unit 30 is supplied with power from the AC line 2 to supply the fuel gas. Power is supplied to the vaporizing section 36 of the section 30 from the AC line 2 via the power supply switching device 8. That is, in the vaporization section 36 of the fuel gas supply section 30, LNG can be continuously vaporized using the heat supplied from the heat supply section 31. The power generation device 11 can continue the operation by consuming the fuel gas continuously supplied from the fuel gas supply unit 30.

  On the other hand, when power is not supplied to the AC line 2 from both the power system 1 and the power generation device 11, the power supply switching device 8 supplies power supplied from the power storage unit 21 of the auxiliary power supply device 20 as a power supply source. Is supplied to the vaporizing section 36. As a result, even when power is not supplied to the AC line 2 from both the power system 1 and the power generator 11, that is, for example, a power failure occurs in the power system 1 and the operation of the power generator 11 is stopped. Even in such a situation, the vaporizing unit 36 can operate using the electric power supplied from the auxiliary power supply device 20 via the power supply switching device 8. Therefore, even if it is not possible to continuously supply heat from the heat supply unit 31 to the vaporization unit 36 because the heat supply unit 31 cannot operate because power is not supplied from the AC line 2, the heat retained by the vaporization unit 36 As long as there is a temperature difference between LNG and LNG, fuel gas containing natural gas obtained by vaporizing LNG is supplied to power generation device 11. As a result, the power generation device 11 operates by consuming the fuel gas supplied from the fuel gas supply unit 30 even when a power failure or the like occurs in the power system 1 and the operation of the power generation device 11 is stopped. And the operation can be continued even temporarily.

  As described above, even in a situation where a power failure or the like occurs in the power system 1 and the operation of the power generation device 11 is stopped, the operation of the power generation device 11 is started and the operation is continued even if the operation is temporary. By doing so, a situation in which power is supplied from the power generator 11 to the AC line 2 is created. As a result, electric power is supplied from the AC line 2 to the heat supply unit 31 of the fuel gas supply unit 30, so that heat is continuously supplied from the heat supply unit 31 to the vaporization unit 36 in the fuel gas supply unit 30, In addition, the LNG is continuously vaporized in the vaporizing section 36 using the supplied heat. Since the fuel gas is continuously supplied from the fuel gas supply unit 30 to the power generation device 11, the power generation device 11 can continue to operate and continuously supply power to the AC line 2.

  FIG. 2 is a diagram illustrating a state in which power is supplied to the AC line 2 from at least one of the power system 1 and the power generator 11. In the figure, the location where power is supplied is drawn with a bold line, and the circuit breaker that is turned on (connected) is drawn with a bold line. In the example illustrated in FIG. 2, power is supplied to the AC line 2 from both the power system 1 and the power generator 11. Then, the power supply switching device 8 conducts the contact a and the contact c. As a result, electric power is supplied to the vaporization unit 36 of the fuel gas supply unit 30 from the AC line 2 via the power supply switching device 8. Electric power is also supplied from the AC line 2 to the heat supply unit 31 of the fuel gas supply unit 30. Therefore, the vaporization unit 36 of the fuel gas supply unit 30 can continuously vaporize LNG using the heat supplied from the heat supply unit 31.

  The power generation device 11 can continuously operate by consuming fuel gas including natural gas continuously supplied from the fuel gas supply unit 30. The power generation device 11 can supply the generated power to the AC line 2. Then, the power supplied from the power generator 11 to the AC line 2 can be consumed by the important power load 3 and the general power load 4.

  FIG. 3 is a diagram illustrating a state in which power is not supplied to the AC line 2 from both the power system 1 and the power generator 11. For example, FIG. 3 corresponds to a state immediately after a power failure occurs in the power system 1. In this state, since power is not supplied to the AC line 2, the power supply switching device 8 conducts the contact b and the contact c. As a result, electric power is supplied from the auxiliary power supply device 20 to the vaporization unit 36 of the fuel gas supply unit 30 via the power supply switching device 8. Since no power is supplied to the AC line 2, no power is supplied to the heat supply unit 31 of the fuel gas supply unit 30. Therefore, heat is not supplied from the heat supply unit 31 to the vaporization unit 36 in the fuel gas supply unit 30.

  However, even if the supply of heat from the heat supply unit 31 to the vaporization unit 36 is stopped in the fuel gas supply unit 30 because the power supply to the heat supply unit 31 of the fuel gas supply unit 30 is stopped, The vaporizing section 36 of the supply section 30 retains the heat previously supplied from the heat supply section 31 of the fuel gas supply section 30, and there is a temperature difference between the retained heat and LNG. Then, the vaporization unit 36 can vaporize LNG. Then, the fuel gas including the natural gas vaporized by the vaporization unit 36 can be supplied to the power generation device 11. In addition, the auxiliary power supply device 20 can supply power for starting the power generation device 11 to the power generation device 11. As a result, the power generation device 11 starts the operation by consuming the fuel gas supplied from the fuel gas supply unit 30 and can continue the operation even temporarily.

When the power generation device 11 starts the operation by consuming the fuel gas supplied from the fuel gas supply unit 30 and continues the operation even temporarily, the power generated by the power generation device 11 , The power supply to the heat supply unit 31 is also restarted. As a result, in the fuel gas supply unit 30, the supply of heat from the heat supply unit 31 to the vaporization unit 36 is restarted, and the vaporization of LNG in the vaporization unit 36 is reliably performed. In addition, when power is supplied to the AC line 2, the power supply switching device 8 causes the contact points a and c to conduct, and power is continuously supplied to the vaporizer 36 from the AC line 2.
As described above, even in a state immediately after a power failure occurs in the power system 1 as shown in FIG. 3, the state of the power generation device 11 is thereafter shifted to a state in which the power generation device 11 can be continuously operated. Can be done.

FIG. 4 is a diagram illustrating a specific example of the LNG satellite facility.
AC line 2 is connected to power system 1 via circuit breaker A. A power distribution board, a terminal block, and the like are provided in the middle of the AC line 2 to branch off the power line, but these power distribution boards, the terminal block, and the like are not shown in FIG. In the example illustrated in FIG. 4, a general power load 4 is connected to a first connection point P1 of the AC line 2 via a circuit breaker D. An important power load 3 is connected to a second connection point P2 of the AC line 2 via a circuit breaker C. The power generator 11 is connected to a third connection point P3 of the AC line 2 via a circuit breaker F. A power generator accessory 12 such as a pump and a fan used in the power generator 11 is connected to the fourth connection point P4 of the AC line 2. The auxiliary power supply device 20 is connected to the fifth connection point P5 of the AC line 2. A power supply switching device 8 is connected to a sixth connection point P <b> 6 of the AC line 2 via a transformer 10. The heat supply unit 31 of the fuel gas supply unit 30 is connected to a seventh connection point P7 of the AC line 2.

  A circuit breaker B is provided between the first connection point P1 and the second connection point P2 of the AC line 2, and a circuit breaker E is provided between the second connection point P2 and the third connection point P3. A transformer 9 is provided between the third connection point P3 and the fourth connection point P4 of the AC line 2.

  The auxiliary power supply device 20 includes a power storage unit 21, a power converter 22, a transformer 23, and a power converter 24. The power converter 22 is connected to the fifth connection point P5 of the AC line 2, converts AC power input from the AC line 2 into DC power, and outputs the DC power to the power storage unit 21 and the transformer unit 23. The transformer 23 is a step-down circuit using, for example, a silicon dropper. The power converter 24 converts the DC power that has been stepped down by the transformer 23 into a desired AC power and outputs it to the contact b of the power supply switching device 8.

In the auxiliary power supply device 20, DC power is supplied from the DC unit between the transformer unit 23 and the power converter 24 to the power generator control unit C2 and the circuit breaker control unit C3. The auxiliary power supply device 20 can supply the power stored in the power storage unit 21 to the power generation device control unit C2 and the circuit breaker control unit C3 even when power is not supplied to the AC line 2. That is, the power generator control unit C2 and the circuit breaker control unit C3 can continue to operate as long as power is supplied from the auxiliary power supply device 20, even when power is not supplied to the AC line 2.
The operations of the power generator control unit C2 and the circuit breaker control unit C3 will be described later.

  In the LNG satellite facility shown in FIG. 4, an uninterruptible power supply 13 is provided. The uninterruptible power supply 13 is connected between the power supply switching device 8 and the vaporization unit 36, and can store power supplied from the power supply switching device 8 and supply power to the vaporization unit 36. In this case, the power supply switching device 8 operates to switch the power supply source for the uninterruptible power supply 13 to one of the AC line 2 and the auxiliary power supply 20. Specifically, the uninterruptible power supply 13 is connected to the contact c of the power supply switching device 8, and the satellite control unit C1 and the vaporizing unit 36 of the fuel gas supply unit 30 are connected to the uninterruptible power supply 13. Configuration. By adopting such a configuration, for example, even if an instantaneous voltage drop occurs in the AC line 2, stable power supply is performed to the satellite control unit C1 and the vaporization unit 36 via the uninterruptible power supply 13. be able to. Further, when power is not supplied to the AC line 2 from both the power system 1 and the power generation device 11, that is, for example, a power outage occurs in the power system 1 and the operation of the power generation device 11 is stopped. However, the satellite control unit C1 and the vaporization unit 36 can operate by receiving the supply of the electric power stored in the uninterruptible power supply 13.

  When such an uninterruptible power supply 13 is provided, the power supply switching device 8 automatically switches the power supply source for the uninterruptible power supply 13 to the AC line 2 and the auxiliary power supply 20 as described above. It may be configured to operate so as to switch to any one of them, or the power supply source for the uninterruptible power supply 13 may be switched between the AC line 2 and the auxiliary power supply 20 according to a command from another control device. It may be configured using a switch that operates to switch to either one. In the latter case, the control device monitors the power stored in the uninterruptible power supply 13 (remaining power), and when the remaining power is equal to or greater than a set value (that is, the power is supplied from the uninterruptible power supply 13). When power is supplied), the power supply switching device 8 is operated so that the uninterruptible power supply 13 is connected to the AC line 2, and when the remaining storage amount becomes less than the set value (that is, the uninterruptible power supply 13 until the power supply to the AC line 2 is started next time, the uninterruptible power supply 13 is connected to the auxiliary power supply 20 and the uninterruptible power supply The power supply switching device 8 can be controlled so that the power supply to the power supply 13 is performed.

  The heat supply unit 31 of the fuel gas supply unit 30 includes a heating medium passage 33 through which a heating medium circulates, a heating unit 32 that can heat the heating medium circulating through the heating medium passage 33, and a heating medium passage 33. And a heat exchanger 35 for exchanging heat between the heat held by the heat medium flowing through the heat medium flow path 33 and the LNG flowing through the LNG flow path 6. In the present embodiment, the LNG flow path 6 is bifurcated downstream of the electromagnetic valve 37, and electromagnetic valves 38a and 38b and heat exchangers 35a and 35b are provided in the branched LNG flow paths 6a and 6b, respectively. Have been. With such a configuration, LNG is vaporized in the heat exchanger 35, and the natural gas vaporized in the heat exchanger 35 passes through the gas passages 7 a and 7 b, the pressure of which is adjusted by the governor 39, and the gas passage. 7 to the generator 11 side.

  The heating unit 32 is configured using, for example, a boiler that burns a gas and heats the heat medium flowing through the heat medium flow path 33 using the heat of combustion. The gas to be burned is, for example, natural gas branched from the gas passage 7. In such a boiler, electric power is required to operate a fan (not shown) for supplying oxygen (air) and the like. Electric power is also required to operate the pump 34 for circulating the heat medium. In the present embodiment, the heat supply unit 31 of the fuel gas supply unit 30 is connected to the seventh connection point P7 of the AC line 2 and uses the power supplied from the AC line 2 to supply heat to the heat supply unit 31 (for example, Fan 34 and the pump 34) operate.

  The vaporizing section 36 of the fuel gas supply section 30 includes an electromagnetic valve 37 provided in the middle of the LNG flow path 6 and an electromagnetic valve provided in the middle of the LNG flow paths 6a and 6b branched downstream from the electromagnetic valve 37. 38 a and 38 b and heat exchangers 35 a and 35 b for exchanging heat between the heat held by the heat medium flowing through the heat medium flow path 33 and LNG flowing through the LNG flow path 6. The operations of the solenoid valve 37 and the solenoid valves 38a and 38b are controlled by the satellite control unit C1. That is, the vaporizing section 36 of the fuel gas supply section 30 operates using the electric power supplied via the power supply switching device 8.

  Next, referring to FIG. 5 to FIG. 8, immediately after a power failure occurs in the power system 1, the power generation device 11 is started, power supply from the power system 1 is restarted, and the power generation device 11 is connected to the power system 1. An operation example of the LNG satellite facility until the re-connection is described. In the drawing, a portion where power is supplied is drawn with a bold line, and a circuit breaker that is turned on (connected) is drawn with a bold line.

[Immediately after a power outage occurs]
FIG. 5 is a diagram illustrating a state immediately after a power failure occurs in the power system 1.
When a power failure occurs in the electric power system 1, the power generation device control unit C2 stops the power generation device 11 and shuts off the circuit breaker F. For example, the occurrence of a power failure in the power system 1 can be realized using a voltage sensor capable of detecting the voltage of the power in the power system 1. In that case, the generator control unit C2 determines that a power failure has occurred in the power system 1 when the voltage on the side of the power system 1 lower than the circuit breaker A is lower than a predetermined voltage. Then, when determining that a power failure has occurred in the power system 1, the power generation device control unit C2 stops its own engine 11a and the power generator 11b. As a result, the power supply to the AC line 2 from both the power system 1 and the power generator 11 is stopped, but the power is supplied to the power storage unit 21 of the auxiliary power supply device 20 to the power generator control unit C2 and the breaker control unit C3. As long as is stored, power supply from auxiliary power supply device 20 is continued. Further, the power generator control unit C2 executes an automatic reset function for verifying the operation of the engine 11a and the generator 11b.

  When a power failure occurs in the power system 1 and the voltage on the power system 1 side becomes lower than the predetermined voltage than the circuit breaker A, the circuit breaker control unit C3 performs the circuit breaker A, the circuit breaker B, and the circuit breaker C. Then, the circuit breaker D is turned off. In addition, the breaker control unit C3 shuts off the breaker E when the power supply to the AC line 2 from both the power system 1 and the power generator 11 stops. By operating each circuit breaker as described above, power is not supplied to the important power load 3 and the general power load 4.

  Since power is not supplied to the AC line 2, the power supply switching device 8 operates to make the contact point b and the contact point c conductive. As a result, the power stored in the power storage unit 21 of the auxiliary power supply device 20 can be supplied to the satellite control unit C1 and the vaporization unit 36. The satellite control unit C1 can supply LNG to the heat exchanger 35 by opening the electromagnetic valve 37 constituting the vaporizing unit 36 and opening at least one of the electromagnetic valves 38a and 38b. In this state, no power is supplied to the heat supply unit 31, so that heat cannot be newly generated in the heating unit 32 and the heat medium flows through the heat medium flow path 33 (that is, the heat exchanger 35). Cannot be newly supplied), but the heat retained by the heat exchanger 35 before the power failure occurs in the power system 1 remains. Therefore, in the heat exchanger 35, LNG can be vaporized by the temperature difference between the retained heat and the supplied LNG.

It is preferable that the heat exchanger 35 included in the vaporizing section 36 employs a material or a structure capable of holding as much heat as possible from the heat medium flow path 33. For example, if the material forming the heat exchanger 35 is configured to function as a heat medium capable of holding a large amount of heat, even if new heat is not supplied from the heat medium flow path 33, the heat is already held. More heat can be used to vaporize more LNG. Specifically, the vaporization unit 36 may not be able to continuously supply heat from the heat supply unit 31 to the vaporization unit 36 because the heat supply unit 31 cannot operate because power is not supplied from the AC line 2. , LNG is vaporized to produce a predetermined amount of natural gas. For example, the predetermined amount corresponds to the amount of natural gas as fuel gas consumed by the power generator 11 until the power generator 11 is started and the generated power can be supplied to the AC line 2. Then, even when heat cannot be continuously supplied from the heat supply unit 31 to the vaporization unit 36, LNG is vaporized by the heat already held by the heat medium included in the vaporization unit 36, and the power generation device 11 is started. Then, the amount of natural gas consumed by the power generation device 11 can be generated until the generated power can be supplied to the AC line 2.
As described above, in the state shown in FIG. 5, the natural gas vaporized in the heat exchanger 35 can be supplied to the power generation device 11 through the gas passage 7.

[After starting the power generator]
FIG. 6 is a diagram illustrating a state after the power generation device 11 is started.
The power generation device control unit C2 consumes the fuel gas including the natural gas vaporized as described above to start the operation of the engine 11a, and drives the generator 11b by the engine 11a to generate the power generation operation of the power generation device 11. To start. That is, when the power supply from the power system 1 to the AC line 2 is stopped, the power generation device 11 stops power generation and then restarts power generation by operating using the power supplied from the auxiliary power supply device 20. It is configured. For example, after executing the above-described automatic reset function, the power generation device control unit C2 executes an automatic start function (blackout start function: BOS function) for starting operation of its own engine 11a and generator 11b. Thereafter, when the output voltage of the generator 11b reaches a predetermined voltage (for example, 6.6 kV), the power generation device control unit C2 turns on the circuit breaker F, and accordingly, for example, the voltage at the third connection point P3 changes to the predetermined voltage ( When the voltage reaches 6.6 kV, for example), the circuit breaker control unit C3 turns on the circuit breaker E. In addition, the breaker control unit C3 turns on the breaker C. As a result, power supply to the AC line 2 from the power generation device 11 is restarted, and power is also supplied to the important power load 3, although the power system 1 is out of power. In addition, electric power is also supplied from the AC line 2 to the power generator auxiliary equipment 12 such as a pump and a fan used in the power generator 11.

  Since power is supplied to the AC line 2, the power supply switching device 8 operates to make the contact a and the contact c conductive. As a result, it becomes possible to supply power from the AC line 2 to the satellite control unit C1 and the vaporizing unit 36. Further, power can also be supplied from the AC line 2 to the heat supply unit 31 of the fuel gas supply unit 30. The heat supply unit 31 is configured to resume operation when power supply to the AC line 2 is resumed. In the present embodiment, the satellite control unit C1 operates the heating unit 32 and the pump 34 of the heat supply unit 31 using the electric power supplied from the AC line 2 to transfer heat from the heat supply unit 31 to the vaporization unit 36. Start supplying. For example, when the power supply to the AC line 2 (that is, power supply to itself) is restarted, the heating unit 32 of the heat supply unit 31 executes an automatic reset function for verifying its own operation. The automatic reset function cannot be normally executed when the pressure of the combustion gas supplied to the heating unit 32 is low, or when the intake air filter of the combustion air is clogged. There is also. Then, if the automatic reset function can be normally executed, the heating unit 32 of the heat supply unit 31 restarts the heating operation on the heat medium circulating in the heat medium flow path 33. The pump 34 also starts operating. Thus, the vaporization of LNG in the vaporization unit 36 is performed using the heat continuously supplied from the heat supply unit 31.

[Immediately after power system restoration]
FIG. 7 is a diagram illustrating a state after the power supply from the power system 1 is restarted.
When the power supply from the power system 1 is restarted and the voltage on the power system 1 side with respect to the circuit breaker A becomes equal to or higher than a predetermined voltage (that is, when the power is restored), the power generator control unit C <b> 2 And the circuit breaker D is turned on. As a result, power is supplied from the power system 1 to the general power load 4.
At this time, since the circuit breaker B is performing a breaking operation, the power generator 11 is not connected to the power system 1.

[After grid connection]
FIG. 8 is a diagram illustrating a state in which the power generation device 11 is reconnected to the power system 1.
The power generator control unit C2 controls the operation of the power generator 11 so that the power is synchronized between the primary side (the power system 1 side) and the secondary side (the power generator 11 side) of the circuit breaker B, and at the synchronized timing. The circuit breaker controller C3 is instructed to turn on the circuit breaker B. Then, the circuit breaker control unit C3 turns on the circuit breaker B, so that the power generator 11 and the power system 1 are interconnected.

<Second embodiment>
The LNG satellite facility of the second embodiment is different from the first embodiment in that a boil-off gas supply unit 41 and a fuel gas storage unit 50 are provided. Hereinafter, the LNG satellite facility of the second embodiment will be described, but the description of the same configuration as that of the first embodiment will be omitted.

  FIG. 9 is a diagram illustrating a schematic configuration of the LNG satellite facility of the second embodiment. As illustrated, the fuel gas supply unit 30 includes a boil-off gas supply unit 41 that supplies boil-off gas (BOG) generated in the LNG storage tank 5 to the power generation device 11 as a fuel gas. The boil-off gas supply unit 41 is connected to the contact c of the power supply switching device 8 similarly to the vaporization unit 36, and receives power supply from the AC line 2 or the auxiliary power supply device 20 via the power supply switching device 8. Can be. That is, the power supply switching device 8 of the present embodiment vaporizes the power supplied from the AC line 2 as a power supply source when the AC line 2 is supplied with power from at least one of the power system 1 and the power generator 11. When the power is supplied to the AC line 2 from both the power system 1 and the power generation device 11, the power supplied from the auxiliary power supply device 20 as the power supply source is vaporized. It is configured to supply to the section 36 and the boil-off gas supply section 41.

  In addition, the LNG satellite facility of the present embodiment has a storage space in which the fuel gas can be temporarily stored in the gas flow path 7 through which the fuel gas supplied from the fuel gas supply unit 30 to the power generation device 11 passes. The fuel gas storage unit 50 is provided.

  FIG. 10 is a diagram illustrating a configuration example of the fuel gas supply unit 30. Since the LNG satellite equipment includes the boil-off gas supply unit 41, the boil-off gas existing inside the LNG storage tank 5 can be supplied to the power generation device 11 via the boil-off gas flow path 40. As shown in the drawing, the boil-off gas supply unit 41 has a BOG heater 42, an electromagnetic valve 43, and a governor 44. The BOG heater 42 is a device that heats the boil-off gas, which is supplied through the boil-off gas flow path 40 and is present inside the LNG storage tank 5, by, for example, the heat of the atmosphere. The operation of the solenoid valve 43 is controlled by the satellite control unit C1 shown in FIG. With such a configuration, the heated boil-off gas is supplied to the downstream side from the boil-off gas supply unit 41, the pressure is adjusted by the governor 44, and the boil-off gas passes through the gas flow path 7 to the side of the power generator 11. Supplied to

  For example, the set pressure of the governor 44 of the boil-off gas supply unit 41 is set higher than the set pressure of the governor 39 that adjusts the pressure of the gas vaporized by the vaporizing unit 36. Therefore, when the fuel gas can be supplied from both the boil-off gas supply unit 41 and the vaporization unit 36 to the power generation device 11, the supply of the fuel gas from the boil-off gas supply unit 41 to the power generation device 11 has priority. It is done.

  As described above, when the fuel gas supply unit 30 includes the boil-off gas supply unit 41, even if the amount of gas that can be supplied from the vaporization unit 36 to the power generation device 11 is small, the gas supplied from the boil-off gas supply unit 41 Thus, at least a part of the fuel gas amount required by the power generation device 11 can be covered.

  In addition, since the LNG satellite facility includes the fuel gas storage unit 50 in the middle of the gas flow path 7, even if the natural gas vaporized in the vaporization unit 36 is small, a sufficient amount of fuel from the fuel gas storage unit 50 to the power generation device 11 can be supplied. Amount of fuel gas can be supplied. Further, even if the amount of gas supplied from the fuel gas supply unit 30 per unit time fluctuates, the fluctuation is alleviated by the fuel gas storage unit 50 and becomes difficult to be transmitted to the power generator 11. The capacity of the storage space in which the fuel gas can be temporarily stored in the fuel gas storage unit 50 can be appropriately set.

  Also in the case of the present embodiment, immediately after a power failure occurs in the power system 1, the satellite control unit C1 opens the electromagnetic valve 37 included in the vaporizing unit 36 and opens at least one of the electromagnetic valves 38a and 38b. Thereby, LNG can be supplied to the heat exchanger 35 constituting the vaporizing section 36, and the natural gas vaporized by the heat exchanger 35 can be supplied to the power generation device 11 via the gas flow path 7. In addition, immediately after a power failure occurs in the power system 1, the satellite control unit C1 opens the solenoid valve 43 of the boil-off gas supply unit 41. Thereby, the boil-off gas existing inside the LNG storage tank 5 flows out to the boil-off gas flow path 40. Then, the boil-off gas is heated by the BOG heater 42, the pressure is adjusted by the governor 44, and then joins the gas flow path 7. Note that the period during which the satellite control unit C1 opens the solenoid valve 43 of the boil-off gas supply unit 41 immediately after a power failure occurs in the power system 1 may be limited to a predetermined period.

<Third embodiment>
The LNG satellite facility of the third embodiment is different from the above-described embodiment in the form of power supply to the vaporizing unit 36. Hereinafter, the LNG satellite facility of the third embodiment will be described, but the description of the same configuration as the above embodiment will be omitted.

FIG. 11 is a diagram illustrating a schematic configuration of the LNG satellite facility of the third embodiment. As shown in the drawing, the LNG satellite facility consumes a fuel gas supply unit 30 that supplies a fuel gas containing natural gas obtained by vaporizing LNG to the power generation device 11 and a fuel gas supplied from the fuel gas supply unit 30. A power generator 11 for generating electric power, and an AC line 2 to which power is supplied from at least one of the power system 1 and the power generator 11.
Unlike the above embodiment, the LNG satellite facility of the present embodiment does not include the power supply switching device 8.

  In addition, the LNG satellite facility has a power storage unit 21 connected to the AC line 2, stores the power supplied to the AC line 2 in the power storage unit 21, and generates power for starting the power generation device 11. An auxiliary power supply device 20 that can be supplied to the device 11 and an uninterruptible power supply device that is connected to the AC line 2 and the auxiliary power supply device 20 and that can receive power from at least one of the AC line 2 and the auxiliary power supply device 20 14. The uninterruptible power supply 14 has a power storage unit (not shown) that can store the power supplied from the AC line 2 and the power supplied from the auxiliary power supply 20. The heat supply unit 31 of the fuel gas supply unit 30 operates by receiving power supply from the AC line 2, and the vaporization unit 36 operates by receiving power supply via the uninterruptible power supply 14.

  In the LNG satellite facility of the third embodiment as well, when power is supplied to the AC line 2 from at least one of the power system 1 and the power generator 11, the heat supply unit 31 of the fuel gas supply unit 30 is supplied with power from the AC line 2. Is supplied. Further, since power is supplied to the uninterruptible power supply 14 from the AC line 2, power is continuously supplied from the uninterruptible power supply 14 to the vaporization unit 36 of the fuel gas supply unit 30. That is, in the vaporization section 36 of the fuel gas supply section 30, LNG can be continuously vaporized using the heat supplied from the heat supply section 31. As a result, the power generation device 11 can continue the operation by consuming the fuel gas continuously supplied from the fuel gas supply unit 30.

  Even when power is not supplied to the AC line 2 from both the power system 1 and the power generation device 11, that is, for example, even when a power failure occurs in the power system 1 and the operation of the power generation device 11 is stopped. The vaporizer 36 can operate by receiving the power stored in the uninterruptible power supply 14. Further, since power is also supplied from the auxiliary power supply 20 to the uninterruptible power supply 14, power is continuously supplied from the uninterruptible power supply 14 to the vaporizer 36. Therefore, even if it is not possible to continuously supply heat from the heat supply unit 31 to the vaporization unit 36 because the heat supply unit 31 cannot operate because power is not supplied from the AC line 2, the heat retained by the vaporization unit 36 As long as there is a temperature difference between LNG and LNG, fuel gas containing natural gas obtained by vaporizing LNG is supplied to power generation device 11. As a result, the power generation device 11 operates by consuming the fuel gas supplied from the fuel gas supply unit 30 even when a power failure or the like occurs in the power system 1 and the operation of the power generation device 11 is stopped. And the operation can be continued even temporarily.

  As described above, even in a situation where a power failure or the like occurs in the power system 1 and the operation of the power generation device 11 is stopped, the operation of the power generation device 11 is started and the operation is continued even if the operation is temporary. This creates a situation in which power is supplied from the power generator 11 to the AC line 2. As a result, electric power is supplied from the AC line 2 to the heat supply unit 31 of the fuel gas supply unit 30, so that heat is continuously supplied from the heat supply unit 31 to the vaporization unit 36 in the fuel gas supply unit 30, In addition, the LNG is continuously vaporized in the vaporizing section 36 using the supplied heat. Since the fuel gas is continuously supplied from the fuel gas supply unit 30 to the power generation device 11, the power generation device 11 can continue to operate and continuously supply power to the AC line 2.

Although not shown, the fuel gas supply unit 30 supplies the boil-off gas generated in the LNG storage tank 5 to the power generator 11 as a fuel gas, as described in the second embodiment. 41 may be provided. In this case, the boil-off gas supply unit 41 may be configured to operate by receiving power supply via the uninterruptible power supply device 14.
In addition, the LNG satellite facility has a fuel gas storage having a storage space in which fuel gas can be temporarily stored in a gas flow path 7 through which the fuel gas supplied from the fuel gas supply unit 30 to the power generation device 11 passes. A unit 50 may be provided.

<Another embodiment>
<1>
In the above embodiment, the LNG satellite facility of the present invention has been described with a specific example, but the configuration can be changed as appropriate.
For example, in the above-described embodiment, the power generation device 11 is configured by various types of devices such as a type including a turbine that rotates by combustion gas generated by burning fuel gas, and a generator 11b driven by the turbine. realizable.

<2>
In the above embodiment, the example in which the vaporizing unit 36 includes the two heat exchangers 35 has been described. However, the number of the heat exchangers 35 included in the vaporizing unit 36 can be set as appropriate. However, in a state immediately after a power failure occurs in the power system 1 as shown in FIG. 5, all the heat exchangers 35 provided in the vaporizing section 36 are so arranged that the amount of gas vaporized in the vaporizing section 36 is as large as possible. It is preferable that LNG is vaporized in the above.

<3>
In the above embodiment, the example in which the satellite control unit C1, the power generator control unit C2, and the circuit breaker control unit C3 are provided in the LNG satellite facility has been described. However, the number of control units provided in the LNG satellite facility, What function the unit performs can be set as appropriate. Further, in the LNG satellite equipment, the satellite control unit C1, the power generator control unit C2, and the circuit breaker control unit C3 may automatically perform the above-described control, or may respond to a command from an operator of the LNG satellite equipment. You may go.

<4>
The configuration disclosed in the above embodiment (including another embodiment) can be applied in combination with the configuration disclosed in another embodiment as long as no contradiction arises, and is disclosed in this specification. The embodiment described above is an exemplification, and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

  INDUSTRIAL APPLICATION This invention can be utilized for the LNG satellite equipment which can start operation | movement of a power generator and can continue the operation | movement, even if the suspension of the electric power supply from an electric power system becomes for a long time.

REFERENCE SIGNS LIST 1 power system 2 AC line 5 LNG storage tank 7 gas flow path 8 power supply switching device 11 power generation device 13 uninterruptible power supply 14 uninterruptible power supply 20 auxiliary power supply 21 power storage unit 30 fuel gas supply unit 31 heat supply unit 36 vaporization unit 41 Boil-off gas supply unit 50 Fuel gas storage unit

Claims (8)

A fuel gas supply unit that supplies a fuel gas containing natural gas obtained by vaporizing LNG to a power generation device, the power generation device that consumes the fuel gas supplied from the fuel gas supply unit to generate power, and a power system And an AC line to which power is supplied from at least one of the power generation device, and an LNG satellite facility,
An auxiliary power supply device that has a power storage unit connected to the AC line, stores power supplied to the AC line in the power storage unit, and can supply power for starting the power generation device to the power generation device. Prepared,
The fuel gas supply unit includes a vaporization unit that retains supplied heat and vaporizes LNG by a temperature difference between the retained heat and LNG, and a heat supply unit that supplies heat to the vaporization unit. The heat supply unit operates by receiving power supply from the AC line, and the vaporization unit is configured to operate by receiving power supply from a power supply switching device connected to a plurality of power supply sources,
The power supply switching device, when power is supplied to the AC line from at least one of the power system and the power generation device, supplies power supplied from the AC line as the power supply source to the vaporization unit. When power is not supplied to the AC line from both the power system and the power generation device, power supplied from the auxiliary power supply device as the power supply source is supplied to the vaporization unit. LNG satellite equipment. The fuel gas supply unit includes a boil-off gas supply unit that supplies boil-off gas generated in an LNG storage tank to the power generation device as the fuel gas,
The boil-off gas supply unit is configured to operate by receiving power supply from the power supply switching device, and the power supply switching device is supplied with power from at least one of the power system and the power generation device to the AC line. In this case, the power supplied from the AC line as the power supply source is supplied to the vaporization unit and the boil-off gas supply unit, and the AC line is supplied with power from both the power system and the power generation device. 2. The LNG satellite facility according to claim 1, wherein when there is no power supply, the power supplied from the auxiliary power supply device serving as the power supply source is supplied to the vaporization unit and the boil-off gas supply unit. A fuel gas supply unit that supplies a fuel gas containing natural gas obtained by vaporizing LNG to a power generation device, the power generation device that consumes the fuel gas supplied from the fuel gas supply unit to generate power, and a power system And an AC line to which power is supplied from at least one of the power generation device, and an LNG satellite facility,
An auxiliary power supply device that has a power storage unit connected to the AC line, stores power supplied to the AC line in the power storage unit, and can supply power for activating the power generation device to the power generation device; ,
An uninterruptible power supply connected to the AC line and the auxiliary power supply and capable of receiving power supply from at least one of the AC line and the auxiliary power supply;
The fuel gas supply unit includes a vaporization unit that retains supplied heat and vaporizes LNG by a temperature difference between the retained heat and LNG, and a heat supply unit that supplies heat to the vaporization unit. The heat supply unit operates by receiving power supply from the AC line, and the vaporization unit operates by receiving power supply via the uninterruptible power supply. The fuel gas supply unit includes a boil-off gas supply unit that supplies boil-off gas generated in an LNG storage tank to the power generation device as the fuel gas,
The LNG satellite facility according to claim 3, wherein the boil-off gas supply unit is configured to operate by receiving power supply through the uninterruptible power supply.   The power generator is configured to stop power generation from the power system to the AC line, stop power generation, and then restart power generation by operating using power supplied from the auxiliary power supply device. The LNG satellite facility according to any one of claims 1 to 4.   The fuel gas storage unit according to claim 1, further comprising a fuel gas storage unit having a storage space in which a fuel gas can be temporarily stored in a gas flow path through which a fuel gas supplied from the fuel gas supply unit to the power generation device passes. An LNG satellite facility according to any one of the preceding claims.   The LNG satellite facility according to any one of claims 1 to 6, wherein the heat supply unit is configured to restart operation when power supply to the AC line is restarted. The vaporization unit vaporizes LNG even when the heat supply unit cannot operate due to the power supply not being supplied from the AC line, so that heat cannot be continuously supplied from the heat supply unit to the vaporization unit. Is configured to have a heat medium capable of holding heat capable of generating a predetermined amount of natural gas,
The said predetermined amount corresponds to the amount of natural gas as the fuel gas consumed by the power generation device until the power generation device is activated and the generated power can be supplied to the AC line. The LNG satellite facility according to any one of claims 1 to 7.

Images