Battery operating system for liquefied natural gas fuel ship

Abstract

A battery operating system for a liquefied gas fuel vessel is provided. The battery operating system for a liquefied gas fuel vessel comprises: a fuel supply device for supplying liquefied gas as fuel; a generator for supplying power generated by fuel generation to a demand point through a power grid; and a battery for charging based on the fuel generation and supplying the charged power to a demand point through the power grid, wherein the fuel supply device performs fuel supply for fuel generation to reduce the pressure in the cargo tank when the pressure value in the cargo tank corresponds to a preset set pressure value, and the battery is charged based on the fuel supply when the charging rate corresponds to a preset chargeable value, and can supply power to a demand point when the charging rate corresponds to a preset dischargeable value.

Description

Technology Field

[0001] The present invention relates to a battery operating system for a liquefied gas fuel ship. Background Technology

[0002] When unloading cargo on liquefied gas (LNG) fuel vessels, the desired tank pressure must be achieved, and maintaining optimal pressure is crucial to minimize the generation of boil-off gas during operation. To this end, fuel supply systems, reliquefaction systems, gas combustion units (GCUs), and vents are utilized. In the operation of such LNG fuel vessels, battery operating systems are used merely as auxiliary power for generators and are not operated in conjunction with specific systems. Prior art literature

[0003] Korean Patent Publication No. 10-2015-0086029 The problem to be solved

[0004] The problem that the present invention aims to solve is to provide a battery operation system for a liquefied gas fuel vessel that enables efficient vessel operation by operating the fuel supply device of the liquefied gas fuel vessel in combination with a battery.

[0005] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0006] A battery operation system for a liquefied gas fuel vessel according to one aspect of the present invention for achieving the above objective comprises: a fuel supply device for supplying liquefied gas as fuel; a generator for supplying power generated by fuel generation to a demand point through a power grid; and a battery for charging based on the fuel generation and supplying the charged power to a demand point through the power grid, wherein the fuel supply device performs fuel supply for fuel generation to reduce the pressure of the cargo tank when the pressure value of the cargo tank corresponds to a preset set pressure value, and the battery is charged based on the fuel supply when the charging rate corresponds to a preset chargeable value, and can supply power to a demand point when the charging rate corresponds to a preset dischargeable value.

[0007] The above fuel supply device includes a first part for changing fuel properties and a second part for maintaining the supply amount of the fuel, and the battery can supply power to the power grid corresponding to the power load required by at least one of the first part for changing fuel properties and the second part for maintaining the supply amount of the fuel in the fuel supply device.

[0008] The first part above includes a glycol water pump for supplying glycol water, which serves as a heat medium for heat exchange, to the demand location, and the second part above may include a cargo pump for supplying fuel to the demand location.

[0009] The battery is set to a first mode in which, when the glycol water pump is operated, the charging rate limit changes from a first lower limit to a first upper limit to a second lower limit smaller than the first lower limit and a second upper limit higher than the first upper limit, and charging is performed in the set first mode to supply power to the fuel supply device.

[0010] The above battery can supply power to the fuel supply device when the cargo pump is operated following the operation of the glycol water pump.

[0011] The above battery can be configured to supply power with priority in the order of the first part and the second part. Effects of the invention

[0012] According to the battery operation system of the liquefied gas fuel ship of the present invention as described above, one or more of the following effects are provided.

[0013] According to the present invention, the fuel supply device and battery operating system of a ship, which were previously operated separately and independently, can be operated in a combined manner to enable energy management and organic operation of an efficient liquefied gas fuel ship. Brief explanation of the drawing

[0014] FIG. 1 is a configuration diagram illustrating a battery operation system of a liquefied gas fuel ship according to one embodiment of the present invention. FIG. 2 is a configuration diagram illustrating a configuration including a fuel supply device according to FIG. 1. FIG. 3 is a schematic diagram illustrating another configuration including a fuel supply device according to FIG. 1. FIG. 4 is a flowchart illustrating a method of operating a battery operating system based on fuel supply and re-liquefaction of a liquefied gas fuel line according to an embodiment of the present invention. FIG. 5 is a flowchart sequentially illustrating a method of operating a battery operating system based on the operation of a fuel supply device according to FIG. 4. Specific details for implementing the invention

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0016] Spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used to facilitate the description of the relationship between one element or component and another, as illustrated in the drawings. Spatially relative terms should be understood as terms that include different orientations of the element during use or operation, in addition to the orientations illustrated in the drawings. For example, if an element illustrated in the drawings is flipped, the element described as "below" or "beneath" of another element may be placed "above" of that other element. Therefore, the exemplary term "below" may include both the lower and upper directions. Elements may also be oriented in other directions, and accordingly, spatially relative terms may be interpreted according to the orientation.

[0017] Although terms such as "first," "second," etc. are used to describe various elements, components, and / or sections, it goes without saying that these elements, components, and / or sections are not limited by these terms. These terms are used merely to distinguish one element, component, or section from another. Accordingly, it goes without saying that the first element, first component, or first section mentioned below may be a second element, second component, or second section within the technical scope of the present invention.

[0018] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0019] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In describing with reference to the attached drawings, identical or corresponding components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0021] FIG. 1 is a configuration diagram illustrating a battery operation system of a liquefied gas fuel vessel according to one embodiment of the present invention. Referring to FIG. 1, the battery operation system of a liquefied gas fuel vessel (hereinafter referred to as "battery operation system (1000)") may include a generator (20), a battery (10), a fuel supply device (120), a control unit (210), and a monitoring unit (220).

[0022] Here, the fuel supply device (120) can supply liquefied gas fuel, etc. from the cargo tank (110) to the entire battery operating system (1000). The generator (20) can supply the power generated by fuel generation to a demand source through the power grid.

[0023] The battery (10) is charged based on fuel generation and can supply the charged power to a demand source through a power grid. The fuel supply device (120) can perform fuel supply for fuel generation to reduce the pressure of the cargo tank (110) when the pressure value of the cargo tank (110) deviates from a preset pressure value, for example, when the pressure value of the cargo tank (110) is high.

[0024] The battery (10) can be charged based on fuel supply when the charge rate corresponds to a preset chargeable value (e.g., less than about 80%). Additionally, when the charge rate corresponds to a preset dischargeable value (e.g., more than about 80%), power can be supplied to a demand source.

[0025] The control unit (210) is for controlling the entire battery operation system (1000) and may include an energy management unit for power grid control and an Energy Management System (EMS).

[0026] The monitoring unit (220) can monitor the power output of at least one of the glycol water pump (114) and the cargo pump (56) of the generator (20) or the fuel supply unit (120). Through this monitoring, it is possible to monitor whether the battery (10) power supply, such as to the cargo pump (56) and the glycol water pump (114) of the fuel supply system, is being properly performed.

[0027] Therefore, through mutual correspondence with the generator (20), it is possible to properly determine whether the battery (10) replaces or assists the load of the generator (20). Thus, there is an effect of preventing inefficient and meaningless power supply with low priority from occurring between the battery (10) and the generator (20) according to their respective importance.

[0028] In addition, by selectively combining the power supply of the battery (10) and the generator (20) as needed, it is possible to achieve stable and reliable energy operation.

[0029] FIG. 2 is a configuration diagram illustrating the configuration of a fuel supply device according to FIG. 1. Referring to FIG. 2, the battery operating system (1000) may include a cargo tank (51), a first heat exchanger (111), a second heat exchanger (112), a glycol water tank (113), and a glycol water pump (114).

[0030] Glycol water tanks (113) can store glycol water for heat exchange. These glycol water tanks (113) can be provided to have various arrangements, either single or multiple.

[0031] The first heat exchanger (111) can heat exchange fuel supplied from the cargo tank (51) and supply it to a demand source. Here, the cargo tank may be equipped with a fuel pump (56) for supplying fuel to the first heat exchanger (111).

[0032] The second heat exchanger (112) can heat exchange glycol water in a steam in / out manner and supply it to the first heat exchanger (111), and the glycol water discharged from the first heat exchanger (111) can be heat exchanged again and supplied to the first heat exchanger (111).

[0033] The glycol water pump (114) can supply glycol water to the second heat exchanger (112) between the first heat exchanger (111) and the second heat exchanger (112). Here, the aforementioned demand sources may include the main engine (52), generator (20), boiler (54), etc.

[0034] FIG. 3 is a configuration diagram illustrating a different configuration of a fuel supply device according to FIG. 1. Referring to FIG. 3, the fuel supply device (110) may include a first part (PT1) and a second part (PT2).

[0035] Here, the first part (PT1) and the second part (PT2) may correspond to any part of the fuel supply device (110). For example, the first part (PT1) may include a glycol water pump (114) for providing glycol water. The second part (PT2) may include a cargo pump (56) for providing fuel.

[0036] Referring to FIGS. 1 and 3, in a battery operating system (1000), when the charge rate (SOC) of the battery (10) corresponds to a chargeable value (e.g., less than about 80%), the battery (10) can be charged. At this time, the fuel supply device (110) can supply fuel (e.g., boil-off gas, etc.) supplied from the cargo tank (51) to the generator (20).

[0037] The battery (10) can be charged based on the power production of the generator (20). The battery (10) can be discharged to supply power to a demand source when the charge rate corresponds to a preset dischargeable value (e.g., about 80% or more).

[0038] Meanwhile, the battery (10) can supply power to the power grid corresponding to the power load required by at least one of the first part (PT1) described above for fuel physical property variation and the second part (PT2) described above for maintaining the fuel supply amount in the fuel supply device (110).

[0039] The first part (PT1) includes a glycol water pump (114), and the second part (PT2) may include a cargo pump (56). The battery (10) may be set to a first mode in which, when the glycol water pump (114) is operated, the charge rate limit changes from a first lower limit (e.g., about 20%, etc.) and a first upper limit (e.g., about 80%, etc.) to a second lower limit (e.g., about 10%) which is smaller than the first lower limit and a second upper limit (e.g., about 90%) which is higher than the first upper limit.

[0040] Here, the battery (10) can be charged in the first mode set to supply power to the fuel supply device (110). When the cargo pump (56) is operated, the battery (10) can be set to a second mode to supply power based on the remaining power, etc., in addition to the power supplied to the glycol water pump (114).

[0041] Through this, the battery (10) can supply power to the fuel supply device (110). The battery (10) can supply power in order of priority to the first part (PT1) and the second part (PT2).

[0042] Meanwhile, in a battery discharge mode in which the battery charge rate in the battery operating system (1000) is, for example, about 80% or more, the battery (10) can supply power to the generator (20) to assist the load on the generator (20). Here, the generator (20) can supply power to a power demand location.

[0043] That is, the battery (10) can be charged based on fuel supply when the charge rate (SOC) corresponds to a preset chargeable value (e.g., less than about 80%). And, when the charge rate corresponds to a preset dischargeable value (e.g., more than about 80%), power can be supplied for operating each device on the battery operating system (1000).

[0044] Therefore, the remaining steam gas is supplied as fuel to the generator (20), and the capacity of the battery (10) charged through the generator's power generation is supplied as fuel to other demand sources when needed, thereby saving electricity. In addition, the optimal operating condition of the generator (20), which is about 80% load, can be met, which helps with equipment maintenance.

[0045] The aforementioned fuel supply device (110) has the effect of maintaining the pressure inside the cargo tank (51) at a constant level (e.g., about 1.1 to 1.2 bar, etc.) by supplying the boil-off gas to the generator (20) when the boil-off gas in the cargo tank (51) exceeds the standard and is generated in excess.

[0046] Here, the power generated by the generator (20) leads to the charging of the battery (10), thereby having the effect of simultaneously satisfying the need and purpose of maintaining the aforementioned pressure of the battery (10) and charging the battery (10).

[0047] In addition, the battery (10) charged in this way supplies power for the operation of the fuel supply device (110) on the battery operating system (1000), thereby reducing waste between each element of the battery system (1000) and enabling organic and efficient operation.

[0048] FIG. 4 is a flowchart illustrating a battery operating system operation method based on fuel supply and re-liquefaction of a liquefied gas fuel line according to one embodiment of the present invention (hereinafter referred to as "operation method (S100)").

[0049] Referring to FIG. 4, as an operation method (S100), S110 is a step for determining the operation of a fuel supply device (110), and the fuel supply device (110) can be operated manually or automatically.

[0050] S120 is the first operation stage, and when the operation of the fuel supply device (110) is determined, the fuel supply device (110) can be operated by the control unit so that a change in physical properties between the liquefied gas and the gas on the fuel supply device (110) is performed.

[0051] S130 is a second operation stage in which the supply amount, flow, pressure, etc. of at least one of the liquefied gas and gas can be controlled by the control unit on the fuel supply device (110) to set conditions.

[0052] More specifically, S121 of S120 is a system operation stage in which the fuel supply device (110) may be operated. S112 is a stage in which the glycol water pump (114) may be operated to change the physical properties of the liquefied gas and the gas on the fuel supply device (110) according to the operation of the fuel supply device (110).

[0053] S131 of S130 can operate a cargo pump (56) to maintain the supply amount of at least one of the liquefied gas and gas on the fuel supply device (110).

[0054] Meanwhile, the power consumption of the generator (20), glycol water pump (114), and cargo pump (56) can be monitored. The battery (10) can be charged and discharged based on the monitored power consumption.

[0055] In response to the operation of the glycol water pump (114) on the fuel supply device (110), the battery (10) can be set to a first charging mode in which the charging rate becomes, for example, about 90% from the existing about 80%, and the minimum charging rate is set to, for example, about 10% from the existing about 20%.

[0056] Here, the lowest charge rate may mean the lowest value at which charging is performed on the battery (10). Here, the battery (10) may be charged to a charge rate of approximately 90% through charging in the first charging mode state.

[0057] After the first charging mode, when the cargo pump (56) is operated on the fuel supply device (110), the battery (10) can be set to a second charging mode in which the operation of the fuel supply device (110) is completed, and the battery (10) can be set to a charging rate of, for example, from the existing approximately 80% to approximately 90% and the minimum charging rate is set to, for example, from the existing approximately 20% to approximately 10%.

[0058] Here, the power load priority for the battery (10) can be set in the order of glycol water pump (114) and cargo pump (56). Accordingly, there is an effect of ensuring that the operation of the elements for physical property variation is performed stably and quickly in priority on the system.

[0059] FIG. 5 is a flowchart sequentially illustrating a method of operating a battery operating system based on the operation of a fuel supply device according to FIG. 4.

[0060] Referring to FIG. 5, when the fuel supply device (120) is operated at S110, the glycol water pump (114) can perform an operation for physical property change at S121. At S125, the lower and upper limits of the charge rate of the battery (10) can be changed, respectively, as described above. The battery (10) can supply power to the glycol water pump (114) at the changed charge rate.

[0061] In S131, the cargo pump (56) can be operated to maintain the fuel supply amount. The battery (10) can supply power to the cargo pump (56) with the charge rate changed. When the operation of the fuel supply device (120) is completed in S140, the lower and upper limits of the battery's charge rate can be changed again in S150 as described above.

[0062] In S150, the battery (10) can be charged again to a normal set state or power can be supplied to a demand source through discharge. Meanwhile, in S135, the monitoring unit (220) can monitor the power usage of at least one of the glycol water pump (114) and the cargo pump (56). Based on this monitoring, the battery (10) can supply power to at least one of the glycol water pump (114) and the cargo pump (56).

[0063] The battery (10) with a changed charge rate can supply power to the glycol water pump (114). And the cargo pump (56) can be operated to maintain the fuel supply amount. Here, the battery (10) can supply power to the cargo pump (56). The power supplied by the battery (10) to the glycol water pump (114) and the cargo pump (56) can be supplied based on power usage monitored by the monitoring unit (220) according to the operation of the glycol water pump (114) and the cargo pump (56).

[0064] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0065] S: Ship 10: Battery 20: Generator 52: Main engine 54: Boiler 56: Cargo pump 110: Cargo Hold 111: First heat exchanger 112: Second heat exchanger 113: Glycol water tank 114: Glycol water pump 120: Fuel supply system

Claims

Claim 1 A battery operation system for a liquefied gas fuel vessel, comprising: a fuel supply device for supplying liquefied gas as fuel; a generator for supplying power generated by fuel generation to a demand location through a power grid; and a battery for charging based on the fuel generation and supplying the charged power to a demand location through the power grid, wherein the fuel supply device comprises a first part for changing fuel properties and a second part for maintaining the supply amount of the fuel, and performs fuel supply for fuel generation to reduce the pressure of the cargo tank when the pressure value of the cargo tank corresponds to a preset set pressure value, and the battery supplies power to the power grid corresponding to the power load required by at least one of the first part for changing fuel properties and the second part for maintaining the supply amount of the fuel in the fuel supply device, charges based on the fuel supply when the charging rate corresponds to a preset chargeable value, and supplies power to a demand location when the charging rate corresponds to a preset dischargeable value. Claim 2 delete Claim 3 A battery operating system for a liquefied gas fuel vessel according to claim 1, wherein the first part comprises a glycol water pump for supplying glycol water, which serves as a heat medium for heat exchange, to the demand location, and the second part comprises a cargo pump for supplying fuel to the demand location. Claim 4 A battery operation system for a liquefied gas fuel vessel according to claim 3, wherein the battery is set to a first mode in which, when the glycol water pump is operated, the charging rate limit changes from a first lower limit and a first upper limit to a second lower limit smaller than the first lower limit and a second upper limit higher than the first upper limit, and charging is performed in the set first mode to supply power to the fuel supply device. Claim 5 In paragraph 3, the battery operation system of a liquefied gas fuel vessel is such that when the cargo pump is operated following the operation of the glycol water pump, power is supplied to the fuel supply device. Claim 6 A battery operation system for a liquefied gas fuel vessel, wherein, in paragraph 3, the battery is supplied with power in priority in the order of the first part and the second part.

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