KR20230058229A - Boil-off gas abatement system and method thereof - Google Patents

Abstract

A boil off gas reduction system and method are disclosed. A boil-off gas reduction system according to an embodiment of the present invention includes a storage tank in which cryogenic fluid is stored, a supply line having one end communicating with the storage tank and discharging the stored cryogenic fluid and the other end connected to a supply target, A cooling means for accumulating cold heat and provided to be in contact with the supply line, a thermoelectric element having a heating surface contacting the cooling means, and one end contacting the cooling surface of the thermoelectric element and the other end contacting the storage means. A cooling unit is formed to be located inside the tank and can be cooled by the cooling surface, and when the cryogenic fluid flows through the supply line, the cooling means receives cold air through the supply line and accumulates it. And, when the thermoelectric element is driven, it is characterized in that it is possible to perform heat dissipation from the heating surface of the thermoelectric element using accumulated cold air.

Description

Boil-off gas abatement system and method thereof

The present invention relates to a system for reducing boil-off gas and a method thereof, and more particularly, to reduce boil-off gas by re-liquefying boil-off gas generated inside a storage tank storing cryogenic fluid in a simple manner, or to reduce boil-off gas from the outside. It is to provide a technical idea that can reduce the generation of boil-off gas itself by preventing the inflow of heat into the storage tank.

As the seriousness of energy problems caused by the use of fossil fuels has emerged, research on alternative fuels has been actively conducted.

Among them, the technological idea of using hydrogen as fuel is attracting attention as an alternative fuel because it is eco-friendly and highly efficient. are losing

Such hydrogen is supplied and stored in a liquefied state. The hydrogen in a liquefied state is stored in a cryogenic state, and cryogenic fluids such as liquefied hydrogen are stored in a storage tank, which is stored in a storage tank for a predetermined supply target (e.g., a fuel cell or a hydrogen vehicle). etc.) must be properly supplied.

At this time, even if the storage tank storing the cryogenic fluid such as liquefied hydrogen is insulated, it is not possible to completely block inflow heat from the outside. For example, the filling pipe for filling the cryogenic fluid into the storage tank inevitably has a portion exposed to the outside, and it is virtually impossible to completely block the inflow of external heat through the filling pipe. am.

As external heat is introduced in this way, the cryogenic fluid stored in the storage tank is vaporized little by little to fill the inside of the storage tank. Vaporization of the cryogenic fluid stored in this way is referred to as boil-off gas, and when the amount of such boil-off gas increases, the possibility of explosion increases, which increases the risk.

Therefore, in a storage tank for storing cryogenic fluid, processing such boil-off gas may be a very important issue.

Conventionally, this is treated by re-liquefying the boil-off gas, etc., but the conventional system for re-liquefying the boil-off gas is relatively complex and requires a lot of manufacturing cost, which is burdensome to operate.

Therefore, a technical idea capable of treating boil-off gas or suppressing the generation of boil-off gas itself is required in a storage tank for storing cryogenic fluid with a relatively simple configuration and low cost.

Patent Document 1. Korean Patent Publication (Publication No. 10-2017-0057393, "Boil-off gas re-liquefaction facility")

The problem to be solved by the present invention is to use a cold storage means capable of accumulating cold heat transferred from the outside to a certain level or higher, and a thermoelectric element capable of cooling using current, and the heating surface of the thermoelectric element is cold storage water in which cold air is accumulated. It is to provide a technical idea to perform heat dissipation through the stage and re-liquefy the boil-off gas through the cooling surface of the thermoelectric element.

In addition, a heat shield in contact with the charging pipe formed in the storage tank and a cooling means in contact with the heat shield are provided so that heat introduced from the outside through the charging pipe is dispersed through the heat shield, and the dispersed heat is It is to provide a technical idea capable of significantly suppressing the generation of boil-off gas itself by minimizing the inflow of external heat into the storage tank by allowing it to be offset through cold air accumulated in the storage tank.

In the boil-off gas reduction system according to an embodiment of the present invention for solving the above technical problem, a storage tank in which cryogenic fluid is stored, one end communicates with the storage tank and the stored cryogenic fluid is discharged, and the other end is supplied A supply line connected to an object, a cold storage means for accumulating cold heat and provided to be in contact with the supply line, a thermoelectric element having a heating surface in contact with the cold storage means, and one end contacting the cooling surface of the thermoelectric element. and a cooling part formed such that the other end is located inside the storage tank and can be cooled by the cooling surface, and the cooling means, when the cryogenic fluid flows through the supply line, the supply line It may be characterized in that the cold air is received and accumulated through and, when the thermoelectric element is driven, heat can be radiated from the heating surface of the thermoelectric element using the accumulated cool air.

In addition, the supply line includes a valve for controlling the flow of the cryogenic fluid to the supply line, and the boil-off gas reduction system controls driving of the thermoelectric element based on whether the valve is opened or closed. It may further include a control unit for

Further, the storage tank includes an inner tank for storing the cryogenic fluid and an outer tank spaced apart from the inner tank by a predetermined distance and surrounding the inner tank, wherein the cooling means comprises the inner tank and the inner tank. It may be located in a space formed between outer tank tanks.

A boil-off gas reduction system according to another embodiment of the present invention for solving the above technical problem is a storage tank including an inner tank for storing cryogenic fluid and an outer tank spaced apart from each other by a predetermined distance to surround the inner tank. , A supply line having one end connected to communicate with the storage tank and the other end connected to a supply target to which the cryogenic fluid discharged from the storage tank is to be supplied, penetrating the outer tank to fill the cryogenic fluid and the inner tank A filling pipe formed to communicate with the tank, a heat shield spaced apart from the inner tank by a predetermined distance in a space between the inner tank and the outer tank and surrounding the inner tank, and contacting the heat shield and the supply line. and a cooling means for receiving and accumulating cold air through the supply line when the cryogenic fluid flows through the supply line, wherein the heat shield is configured to reduce at least inlet heat introduced from the outside through the charging pipe. It may be characterized in that a part of the received heat is received and the inflow heat transferred by the cold storage means in which cold air is accumulated can be offset.

A boil-off gas reduction method according to an embodiment of the present invention for solving the above technical problem includes the steps of a boil-off gas reduction system determining whether a valve is opened or closed in a supply line through which cryogenic fluid passes, and the boil-off gas reduction system. and controlling driving of a thermoelectric element for re-liquefaction of boil-off gas in a storage tank in which cryogenic fluid is stored based on whether the valve is opened or closed, wherein the boil-off gas reduction system determines whether the valve is opened or closed. In the step of controlling the operation of the thermoelectric element for re-liquefying the boil-off gas in the storage tank in which the cryogenic fluid is stored, when it is determined that the valve is opened, the boil-off gas reduction system operates based on the cryogenic fluid storage tank. Controlling a thermoelectric element for re-liquefying boil-off gas in a storage tank not to operate, or driving the thermoelectric element by the boil-off gas reduction system when it is determined that the valve is closed as a result of the determination. The boil-off gas reduction system includes a cooling means provided to contact the heating surface of the thermoelectric element and the supply line, respectively, so that when the thermoelectric element is not driven, the supply line through which the cryogenic fluid flows It may be characterized in that the cold storage means receives and accumulates cold air, and when the thermoelectric element is driven, heat dissipation from the heating surface of the thermoelectric element can be performed through the cold air accumulated in the cooling storage means. there is.

According to an embodiment of the present invention, a cold storage means capable of accumulating cold heat transferred from the outside to a certain level or higher and a thermoelectric element capable of cooling using current are used, and the heating surface of the thermoelectric element is cold storage water in which cold air is accumulated. There is an effect of performing heat dissipation through the stage and re-liquefying the boil-off gas through the cooling surface of the thermoelectric element.

In addition, a heat shield in contact with the charging pipe formed in the storage tank and a cooling means in contact with the heat shield are provided so that heat introduced from the outside through the charging pipe is dispersed through the heat shield, and the dispersed heat is By allowing the cold air accumulated in the cold storage unit to be offset, there is an effect of significantly suppressing the generation of boil-off gas itself by minimizing the inflow of external heat into the storage tank.

In order to more fully understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.
1 shows a schematic configuration of a boil-off gas re-liquefaction system according to an embodiment of the present invention.
FIG. 2 is a view for explaining the temperature change for each component according to the operation of the boil-off gas re-liquefaction system according to an embodiment of the present invention.
3 shows a schematic configuration of a boil-off gas re-liquefaction system according to another embodiment of the present invention.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, it should be understood that this is not intended to limit the present invention to specific embodiments, and includes all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other It should be understood that the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, focusing on embodiments of the present invention. Like reference numerals in each figure indicate like elements.

1 shows a schematic configuration of a boil-off gas reduction system according to an embodiment of the present invention.

Referring to FIG. 1, the boil-off gas reduction system 1 according to an embodiment of the present invention includes a storage tank 100 in which cryogenic fluid is stored, and one end communicated with the storage tank 100 to discharge the stored cryogenic fluid. And, when the other end is in contact with the supply line 10 connected to the supply target 20 and the cryogenic fluid flows through the supply line 10, cold water is received and accumulated. Stage 200, a thermoelectric element 300 whose heating surface is in contact with the cooling storage means 200, and/or one end in contact with the cooling surface of the thermoelectric element 300 so that the other end is in contact with the storage tank A cooling unit 310 formed to be positioned inside 100 may be included.

The cryogenic fluid may be a liquefied gas obtained by liquefying a predetermined gas. Hereinafter, in the present specification, a case in which the cryogenic fluid is liquefied hydrogen in which hydrogen is liquefied will be described as an example, but the present invention is not necessarily limited thereto. For example, the cryogenic fluid may be liquefied gas obtained by liquefying various types of gases such as liquid nitrogen, liquid helium, and liquefied natural gas. It can be easily deduced by an average expert in the art to which this invention belongs.

In addition, the supply target 20 may be a predetermined target requiring supply or charging of the cryogenic fluid stored in the storage tank 100 . For example, when the cryogenic fluid stored in the storage tank 100 is liquefied hydrogen, the supply target 20 may refer to a device such as a fuel cell using hydrogen as fuel or a hydrogen vehicle driven by directly using hydrogen as fuel. can Of course, when the cryogenic fluid is of a different type other than liquefied hydrogen, various objects that require the supply of the fluid may be the supply object 20. Hereinafter, as described above, a case in which the cryogenic fluid is liquefied hydrogen and the supply target 20 is a fuel cell or a hydrogen vehicle requiring supply/recharge of hydrogen will be described as an example, but the present invention is not necessarily limited thereto. .

According to an embodiment of the present invention, the storage tank 100 is spaced apart from the inner tank 110 in which the cryogenic fluid is stored and the inner tank 110 by a predetermined distance to surround the inner tank 110. It may be configured to include an outer tank 120 formed therein. In this case, the space between the inner tank 110 and the outer tank 120 may maintain a vacuum state. Depending on the embodiment, there may be a case where the storage tank 100 is made of a single tank, or it is difficult to physically distinguish the internal tank 110 and the external tank 120. Even in this case, the present invention The technical idea of can be applied in the same way.

At this time, the cold storage means 200 and/or the thermoelectric element 300 may be located in a space between the internal tank 110 and the external tank 120, and as shown in the drawing, the thermoelectric element ( 300) may be positioned to face a predetermined position on the outer circumferential surface of the inner tank 110. According to an embodiment, the thermoelectric element 300 may be spaced apart from the outer circumferential surface of the inner tank 110 by a predetermined distance without contacting the outer circumferential surface of the inner tank 110 .

As is widely known, the thermoelectric element 300 is a cooling device or heating device using current by using the Peltier effect in which heat moves along the charge when current is passed to both ends, so that one side is heated and the other side is cooled. is being used to make

According to the technical concept of the present invention, boil-off gas generated by evaporation of the cryogenic fluid stored in the inner tank 110 can be re-liquefied using the characteristics of the thermoelectric element 300, thereby preventing the generation of boil-off gas. It can have the effect of reducing and improving the waiting period.

Referring to the drawings, the boil-off gas reduction system 1 may include the cooling storage means 200 and the thermoelectric element 300 in a space between the internal tank 110 and the external tank 120. .

The cooling means 200 may be implemented with a material capable of receiving and accumulating heat from the outside. For example, the cooling means 200 may be implemented in the form of a predetermined metal block. In one embodiment of the present invention, the cooling means 200 may be formed in the form of an aluminum block having a predetermined volume. Of course, the cold storage means 200 is not limited to the shape of an aluminum block, and as described above, it can be implemented with various materials if it can receive cold heat from the external environment or other components and accumulate it for a certain period of time. can

The cooling means 200 may be provided to contact the supply line 10 in a space between the inner tank 110 and the outer tank 120 . Also, the cooling means 200 may be provided to contact the heating surface of the thermoelectric element 300 .

While the cryogenic fluid flows through the supply line 10, the surface temperature may be very low due to the cryogenic fluid. In addition, the cold storage unit 200 may contact the supply line 10 to receive cold air from the supply line 10 and accumulate it.

When the thermoelectric element 300 is driven according to the technical concept of the present invention, which will be described later, heat dissipation is performed by cooling the heating surface of the thermoelectric element 300 in contact with the cool air accumulated in the cooling means 200. can

In this way, when the heat dissipation from the heating surface of the thermoelectric element 300 is smoothly performed by the cooling means 200, the cooling efficiency of the cooling surface of the thermoelectric element 300 can be improved.

As described above, the cooling surface of the thermoelectric element 300 is connected to the cooling unit 310 installed so that the end is positioned inside the internal tank 110 to cool the cooling unit 310 . If the cooling temperature of the cooling surface and the cooling part 310 can be maintained below the saturation temperature of the boil-off gas vaporized inside the inner tank 110, the cooling part 310 in the inner tank 110 The boil-off gas in contact with may be reliquefied on the surface of the cooling unit 310 and reduced to cryogenic fluid inside the internal tank 110 .

As a result, according to the technical concept of the present invention, cold air is accumulated in the cold storage means 200 by using the cold air of the supply line 10 through which the cryogenic fluid supplied to the supply object 20 passes, and the accumulated cold air is transferred to the internal tank. (110) It is possible to reduce the boil-off gas by using it for heat dissipation of the heating surface of the thermoelectric element 300 capable of re-liquefying the internal boil-off gas.

Meanwhile, as described above, the driving of the thermoelectric element 300 to reduce boil-off gas using the cold storage means 200 and the thermoelectric element 300 may be performed according to a predetermined standard.

FIG. 2 is a view for explaining the temperature change for each component according to the operation of the boil-off gas re-liquefaction system according to an embodiment of the present invention.

According to one example, as shown in FIG. 1, the supply line 10 has a vaporizer 11 for re-vaporizing the cryogenic fluid in a liquefied state, and whether or not it is supplied to the supply target 20 and / or A valve 12 for determining whether to discharge the cryogenic fluid through the supply line 10 may be provided. The vaporizer 11 may be implemented in the form of a heat exchanger.

Referring to FIG. 2 , when the valve 12 is opened and the cryogenic fluid flows through the supply line 10 in the first section of the graph, the thermoelectric element 300 may not be driven. Accordingly, the temperature of the heating surface of the thermoelectric element 300 and the cooling storage means 200 may decrease, and the temperature of the cooling surface of the thermoelectric element 300 may be changed from a temperature at a level at which re-liquefaction of the boil-off gas is possible. It can rise to a certain level.

Also, while the valve 12 is open, cold air may be accumulated in the cold storage means 200 by the cryogenic fluid flowing through the supply line 10 .

Then, when the valve 12 is closed, as the thermoelectric element 300 is driven, the heating surface of the thermoelectric element 300 generates heat and the temperature rises as shown in the second section of the graph, and the cold storage means 200 It can be confirmed that the temperature of the cooling means 200 also rises as the cold air accumulated in is consumed for heat dissipation of the heating surface of the thermoelectric element 300. When the temperature of the cold storage unit 200 rises and reaches a preset temperature Tset, the operation of the thermoelectric element 300 may be stopped. As the operation of the thermoelectric element 300 is stopped, the temperature of the cooling surface of the thermoelectric element 300 decreases again, and the cooling part 310 cooled by the cooling surface of the thermoelectric element 300 Reliquefaction of the boil-off gas may be performed inside the storage tank 100, for example, the inner tank 110. When the valve 12 is closed, it may be a waiting time when the system including the storage tank 100 is not operated, and boil-off gas can be reduced according to the technical idea of the present invention as described above. It may be possible to increase the standby time while improving the efficiency of the system including the storage tank 100 .

On the other hand, the supply line 10 may be simply formed to connect the supply target 20 from the storage tank 100, but as shown in FIG. 1, a part of the supply line 10 is the storage tank (100) After passing the cryogenic fluid stored inside, the pressure control unit (PBU-Pressure Buildup Unit) for the non-gravity pressure control method formed so that it can come out of the storage tank 100 and be connected to the supply target 20 ). This may be equally applied to a boil-off gas reduction system 1 according to another embodiment of the present invention to be described later in FIG. 3 .

As is already known, in order to smoothly supply the cryogenic fluid from the storage tank 100 in which the cryogenic fluid is stored to the supply target 20, it is necessary to maintain the internal pressure in the storage tank 100 at an appropriate level. If the internal pressure of the storage tank 100 is low, the discharge of the cryogenic fluid is not smooth, so supply itself may not be properly performed. Therefore, a pressure control unit for controlling the internal pressure of a storage tank storing such a cryogenic fluid is used, and this pressure control unit uses various pressure control methods (eg, gravity pressure control or non-gravity pressure control, etc.) as needed. are utilizing Since such a pressure control unit is widely known, further detailed description thereof will be omitted in the present specification.

Therefore, the boil-off gas reduction system 1 described in FIG. 1 can control the operation of the thermoelectric element 300 according to the opening or closing of the valve 12 controlled by the pressure control unit. To this end, the boil-off gas reduction system 1 may further include a controller (not shown) for controlling driving of the thermoelectric element 300 .

As described above, the control unit (not shown) may selectively drive the thermoelectric element 300 according to whether the valve 12 is opened or closed.

According to an embodiment, the control unit (not shown) controls the temperature of the heating/cooling surface of the cooling means 200 and/or the thermoelectric element 300 regardless of whether the valve 12 is opened or closed. Driving of the thermoelectric element 300 may be controlled.

The control unit (not shown) may perform calculations for implementing the technical concept of the present invention and a function of controlling the operation of other components (eg, the thermoelectric element 300). To this end, the control unit (not shown) ) may include a processor, a storage device, and a predetermined program stored in the storage device and executed by the processor. In this specification, the controller (not shown) performing a predetermined operation (eg, driving the thermoelectric element 300 depending on whether the valve 12 is opened or closed) means that the processor executes the program to perform a series of operations. The average person skilled in the art will readily infer that this can be done by data processing and/or control.

Meanwhile, in order to fill the cryogenic fluid in the storage tank 100 for storing the cryogenic fluid, an inlet formed to communicate with the outside may be required. The inlet may be implemented in the form of a filling pipe. At this time, the filling pipe inevitably has a portion exposed to the outside, and due to the structure of the filling pipe communicating to the inside of the storage tank 100, external heat flows into the storage tank 100 through the filling pipe. It is transferred to increase the internal temperature of the storage tank 100, vaporize the stored cryogenic fluid, and may be a major cause of boil-off gas.

According to another embodiment of the present invention, it is possible to provide a technical idea capable of reducing the generation of boil-off gas by suppressing or dissipating heat transferred through the filling pipe.

3 shows a schematic configuration of a boil-off gas re-liquefaction system according to another embodiment of the present invention.

Referring to FIG. 3 , a boil-off gas reduction system 1 according to another embodiment of the present invention is spaced apart from an internal tank 110 in which cryogenic fluid is stored and is formed to surround the internal tank 110 A storage tank 100 including an outer tank 120, one end connected to communicate with the storage tank 100, and the other end supplying the cryogenic fluid discharged from the storage tank 100 to the supply target ( 20), a filling pipe 400 formed to communicate with the inner tank 110 by penetrating the outer tank 120 to charge the cryogenic fluid, and the inner tank 110 and a heat shield 500 spaced apart from the inner tank 110 by a predetermined distance in a space between the outer tank 120 and surrounding the inner tank 110, the heat shield 500 and the supply line ( 10) may include a cooling means 200 provided to be in contact with.

As described above in the embodiment of FIG. 1 , the cold storage unit 200 may receive and accumulate cold air from the cryogenic fluid passing through the supply line 10 .

Also, the cold storage unit 200 may transfer accumulated cold air to the contacted heat shield 500 .

The heat shield 500 may be formed to completely surround the inner tank 110 like the outer tank 120, or may be formed to surround only a portion of the outer circumferential surface of the inner tank 110.

In any case, the heat shield 500 may be formed to contact the charging pipe 400 . For example, as shown in the drawing, the heat shield 500 may contact the charging pipe 400 at a position close to the midpoint of the charging pipe 400 in the longitudinal direction.

The fact that the heat shield 500 contacts the charging pipe 400 does not mean that the heat shield 500 penetrates the inside of the charging pipe 400, but that the heat shield 500 It may mean contacting the outer circumferential surface of the charging pipe 400 by a predetermined range at a specific location. The predetermined range may vary according to the thickness and/or width of the heat shield 500, and depending on embodiments, the charge pipe 400 may be wider than the thickness and/or width of the heat shield 500. It may be formed to be in contact with the outer circumferential surface of.

In another embodiment of the present invention shown in FIG. 3 , the cold storage means 200 that receives cold air from the supply line 10 and accumulates the cold air as the cryogenic fluid is transported is transferred to the contacted heat shield 500. It can transmit cold.

Accordingly, external inflow heat Q1 transferred through the charging pipe 400 may be dispersed along the heat shield 500 in contact with the charging pipe 400, and the heat shield 500 The heat dispersed along the way can be offset through the cold air accumulated in the cold storage means 200 .

According to the technical concept of the present invention, at least a portion of the inflow heat Q1 introduced through the charging pipe 400 is dispersed and offset through the heat shield 500, thereby increasing the storage tank 100, particularly the internal tank. The amount of heat Q2 introduced into the tank 110 may be significantly reduced. That is, if the inflow heat Q1 introduced through the filling pipe 400 is conventionally introduced as it is to the inside of the inner tank 110, according to the technical idea of the present invention, at least a part of the inflow heat Q1 While being dispersed and offset through the heat shield 500, as a result, the amount of heat Q2 introduced into the inner tank 110 may be minimized.

Being able to reduce the amount of heat introduced through the filling pipe 400 as described above means that the amount of vaporization of the cryogenic fluid stored inside the internal tank 110 can be reduced due to the consequently introduced heat. According to the embodiment, the generation itself of boil-off gas in the storage tank 100 may be significantly reduced.

Meanwhile, a boil-off gas reduction method according to an embodiment of the present invention may be provided.

4 shows a schematic flow of a boil-off gas reduction method according to an embodiment of the present invention.

Referring to FIG. 4 , the boil-off gas reduction system 1 according to the embodiment of the present invention may determine whether the valve 12 is opened or closed in the supply line 10 (s110).

As a result of the determination, when it is determined that the valve 12 is opened, the boil-off gas reduction system 1 controls the thermoelectric element 300 for re-liquefying the boil-off gas in the storage tank 100 not to operate. (s120), and the cold air can be accumulated (s130) in the cold storage means 200 while the thermoelectric element 300 is not driven.

In addition, when it is determined that the valve 12 is closed as a result of the determination, the boil-off gas reduction system 1 may control the thermoelectric element 300 to operate (s140). As described above, heat dissipation of the heating surface can be performed through cold air accumulated in the cooling storage means 200 in contact with the heating surface.

In addition, the boil-off gas reduction system 1 determines whether the temperature of the cold storage means 200 reaches a preset temperature (Tset) (s150), and determines whether the temperature of the cold storage means 200 reaches the set temperature. When it is determined that (Tset) has been reached, driving of the thermoelectric element 300 may be stopped (s160). In this way, when the temperature of the cold storage means 200 reaches the set temperature Tset and the driving of the thermoelectric element 300 is stopped, as described above, cold air can be accumulated in the cold storage means 200 again. there is.

In addition, when the boil-off gas reduction system 1 determines that the set temperature Tset has not been reached as a result of determining the temperature of the cooling storage means 200, the thermoelectric element 300 continues to operate. You can control it.

As described above, the boil-off gas reduction system 1 may include a processor and a memory for storing programs executed by the processor. The processor may include a CPU, GPU, MCU, APU, microprocessor, single-core CPU or multi-core CPU. The memory may include high-speed random access memory and may also include non-volatile memory such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Access to memory by processors and other components may be controlled by a memory controller. Here, when the program is executed by a processor, the boil-off gas reduction system 1 according to the embodiment of the present invention may perform the above-described boil-off gas reduction method.

The level measurement method according to an embodiment of the present invention may be implemented in the form of computer-readable program instructions and stored in a computer-readable recording medium, and the control program and target program according to an embodiment of the present invention may also be implemented by a computer. It can be stored on a readable recording medium. The computer-readable recording medium includes all types of recording devices in which data that can be read by a computer system is stored.

Program commands recorded on the recording medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in the software field.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, floptical disks and Hardware devices specially configured to store and execute program instructions, such as magneto-optical media and ROM, RAM, flash memory, and the like. In addition, computer-readable recording media may be distributed to computer systems connected through a network, so that computer-readable codes may be stored and executed in a distributed manner.

Examples of program instructions include high-level language codes that can be executed by a device that electronically processes information using an interpreter, for example, a computer, as well as machine language codes generated by a compiler.

The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present invention. .

Claims (5)

A storage tank in which cryogenic fluid is stored;
a supply line having one end communicated with the storage tank and discharging the stored cryogenic fluid and the other end connected to a supply target;
a cooling means for accumulating cold heat and being in contact with the supply line;
a thermoelectric element having a heating surface in contact with the cooling means; and
A cooling unit having one end in contact with the cooling surface of the thermoelectric element and the other end positioned inside the storage tank to be cooled by the cooling surface,
The cooling means,
When the cryogenic fluid flows through the supply line, cold air is received and accumulated through the supply line,
Boil-off gas reduction system, characterized in that when the thermoelectric element is driven, it is possible to perform heat dissipation of the heating surface of the thermoelectric element using the accumulated cold air.
The method of claim 1, wherein the supply line,
A valve for controlling the flow of the cryogenic fluid to the supply line;
The boil-off gas reduction system,
The boil-off gas reduction system further includes a control unit for controlling driving of the thermoelectric element based on whether the valve is opened or closed.
The method of claim 1, wherein the storage tank,
An inner tank for storing the cryogenic fluid and an outer tank spaced apart from the inner tank by a predetermined distance to surround the inner tank,
The cooling means,
A boil-off gas reduction system located in a space formed between the inner tank and the outer tank.
a storage tank including an inner tank for storing cryogenic fluid and an outer tank spaced apart from each other by a predetermined interval to surround the inner tank;
A supply line having one end connected to communicate with the storage tank and the other end connected to a supply target to which the cryogenic fluid discharged from the storage tank is to be supplied;
a filling pipe passing through the outer tank and communicating with the inner tank to charge the cryogenic fluid;
a heat shield spaced apart from the inner tank by a predetermined distance in a space between the inner tank and the outer tank and surrounding the inner tank; and
a cooling means provided in contact with the heat shield and the supply line to receive and accumulate cold air through the supply line when the cryogenic fluid flows through the supply line;
The heat shield,
The boil-off gas reduction system, characterized in that it is possible to receive at least a part of the inflow heat introduced from the outside through the charging pipe, and offset the inflow heat transferred by the cold storage means in which cold air is accumulated.
The boil-off gas reduction system determines whether a valve is opened or closed in a supply line through which the cryogenic fluid passes; and
Controlling, by the boil-off gas reduction system, driving of a thermoelectric element for re-liquefaction of boil-off gas in a storage tank in which cryogenic fluid is stored based on whether the valve is opened or closed,
The step of controlling the operation of the thermoelectric element for reliquefaction of the boil-off gas in the storage tank in which the cryogenic fluid is stored based on whether the boil-off gas reduction system opens or closes the valve,
Controlling, by the boil-off gas reduction system, a thermoelectric element for re-liquefying boil-off gas in a storage tank in which cryogenic fluid is stored, not to be driven when it is determined that the valve is opened as a result of the determination; or
When it is determined that the valve is closed as a result of the determination, the boil-off gas reduction system includes driving the thermoelectric element;
The boil-off gas reduction system,
Including a cooling means provided to contact the heating surface of the thermoelectric element and the supply line, respectively,
When the thermoelectric element is not driven, the cooling means receives and accumulates cold air through the supply line through which the cryogenic fluid flows,
When the thermoelectric element is driven, heat dissipation from a heating surface of the thermoelectric element can be performed through cold air accumulated in the cooling means.

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