KR102248672B1 - System for compressing and cooling hydrogen having a high efficiency - Google Patents

Abstract

The present invention relates to a hydrogen compression cooling system, comprising: a hydrogen compression unit including a hydrogen gas compressor for compressing gaseous hydrogen supplied from a gaseous hydrogen storage tank to a set pressure using a compressed refrigerant; a compressed hydrogen storage tank for storing the compressed hydrogen compressed in the hydrogen gas compressor; a hydrogen cooler for cooling the hydrogen supplied from the compressed hydrogen storage tank to a dispenser by using heat transfer that occurs when a refrigerant provided as a cooling source evaporates; and a cooling module unit that provides a compressed refrigerant as a compression source of hydrogen gas to the hydrogen gas compressor and provides a refrigerant as a cooling source to the hydrogen cooler.

Description

System for compressing and cooling hydrogen having a high efficiency}

The present invention relates to a hydrogen compression cooling system, and more particularly, to a high-efficiency hydrogen compression cooling system that improves efficiency by simultaneously utilizing a refrigerant for a cooling cycle as a compression power of a hydrogen gas compressor and a cooling source of a hydrogen cooler. About.

Currently, most of the energy consumed around the world consists of petroleum and coal, which are fossil raw materials. In particular, it is safe to say that all vehicles use oil such as gasoline or diesel.

However, fossil fuels such as petroleum have a limit in their reserves, and various gases, dusts, and residual substances after combustion that are generated when burning to obtain energy are the main causes of environmental pollution, and global warming, which is the most important issue these days. It can be said to be the main culprit.

Alternative energy sources that can overcome this situation include clean energy sources such as hydrogen and natural energy such as hydropower, wind power, and solar heat. Especially, fuel using hydrogen considering its efficiency and output as an energy source for vehicles. Batteries are expected to be the most desirable power source.

A fuel cell electrochemically generates electricity by using oxygen in the air and hydrogen in the fuel. It is a system that can continuously generate electricity regardless of the capacity of the battery by supplying hydrogen fuel and air from the outside.

In other words, the fuel cell is an ideal power generation system with very high efficiency and little pollution because the chemical energy of hydrogen fuel is directly converted into electric energy electrochemically within the cell without converting it into thermal energy.

Recently, hydrogen fuel cell vehicles using such fuel cells have been developed, and hydrogen fuel cell vehicles use compressed hydrogen gas (for example, about 700 bar) as fuel. Therefore, in order to commercialize a hydrogen fuel cell vehicle, a hydrogen station equipped with a hydrogen charging system capable of supplying compressed hydrogen gas in the same form as a gas station supplying gasoline must be supplied.

By the way, of the equipment manufacturing technology that boosts and stores hydrogen to ultra-high pressure, only the high-pressure container manufacturing technology is manufactured in Korea, and most other facilities depend on imports due to lack of technology.

In general, a hydrogen charging system for hydrogen charging includes a hydrogen gas compressor that compresses hydrogen to an ultra-high pressure, a high-pressure hydrogen tank that stores high-pressure hydrogen, and hydrogen stored in the high-pressure hydrogen tank when charging the hydrogen fuel tank of a vehicle. It includes a hydrogen cooler for cooling.

As the ultra-high pressure hydrogen gas compressor of the conventional hydrogen filling system, a piston-type compression unit is used, and a type using hydraulic pressure and a type using pneumatic pressure are generally used as a driving source of the compressor that drives them. For this purpose, high-pressure oil is used. Devices for providing separate compressed power, such as a hydraulic pump for supplying and an air compressor for providing high-pressure air, are required. In addition, a cooling system for cooling compression heat generated in a high-pressure compression process must be provided separately from compression power units. As described above, since the conventional hydrogen charging system provides compression and cooling through a binary driving unit, the configuration is complicated and there is a disadvantage in terms of cost.

Republic of Korea Patent Publication No. 2012-0011681 (2012.02.08)

Accordingly, the present invention has been conceived to solve the above problems, and an object of the present invention is a compression power for compressing hydrogen gas with a refrigerant in a cooling cycle, instead of hydraulic and pneumatic fluid used as a compression source, It is to provide a high-efficiency hydrogen compression cooling system that improves efficiency by allowing it to be simultaneously utilized as a cooling source for hydrogen cooling.

Another object of the present invention is to use a refrigerant compressed by high pressure with a refrigerant compressor of a cooling module unit used as a cooling source without using hydraulic pressure or pneumatic pressure used as a compression power source, and use it as a pressurization source of a hydrogen gas compressor and discharged after compression. A device used as a cooling source by decompressing and expanding a low-pressure liquid refrigerant so that the refrigerant used for hydrogen gas compression is used to remove the heat of compression generated during hydrogen gas compression without using a separate cooling device. It is constructed, to provide a high-efficiency hydrogen compression cooling system capable of providing system simplification and energy saving by performing two functions of a hydrogen compression function and a hydrogen cooling function through one cooling system.

In order to achieve the above object, the present invention includes a hydrogen compression unit including a hydrogen gas compressor for compressing gaseous hydrogen supplied from a gaseous hydrogen storage tank to a set pressure using a compressed refrigerant; A compressed hydrogen storage tank for storing compressed hydrogen compressed by the hydrogen gas compressor; A hydrogen cooler for cooling hydrogen supplied from the compressed hydrogen storage tank to a dispenser by using heat transfer occurring when the refrigerant provided as a cooling source evaporates; And a cooling module unit configured to provide a compressed refrigerant to the hydrogen gas compressor as a compression source of hydrogen gas and to provide a refrigerant as a cooling source to the hydrogen cooler.

According to an embodiment of the present invention, the cooling module unit includes: a refrigerant compressor for compressing a gaseous refrigerant at high pressure; And a refrigerant condenser liquefying the high-pressure gas refrigerant compressed by the refrigerant compressor into a high-pressure liquid refrigerant, wherein the compressed refrigerant supplied from the cooling module unit to the hydrogen gas compressor is a high-pressure liquid refrigerant liquefied in the refrigerant condenser. And a high-pressure gas refrigerant compressed by the refrigerant compressor.

According to an embodiment of the present invention, a liquid refrigerant tank for storing the liquid refrigerant condensed in the refrigerant condenser; And a liquid separator installed on a path through which a refrigerant is provided to the refrigerant compressor so that a gaseous refrigerant can be supplied to the refrigerant compressor, wherein the liquid refrigerant tank is connected to the hydrogen gas compressor through a refrigerant pipe. A high-pressure liquid refrigerant for hydrogen gas compression is provided to a gas compressor, and a high-pressure liquid refrigerant is connected to the hydrogen cooler to be used as a cooling source. A hydrogen cooler is provided in a path through which the refrigerant is transferred from the liquid refrigerant tank to the hydrogen cooler. An expansion valve is provided, and the refrigerant supplied to the hydrogen gas compressor and the hydrogen cooler is recovered by the liquid separator.

According to an embodiment of the present invention, the hydrogen compression unit includes an expansion valve provided for compression of hydrogen gas in the hydrogen gas compressor and into which the discharged liquid refrigerant is introduced, and the hydrogen compression unit includes a cooling jacket formed in the hydrogen gas compressor. And a compression heat removal unit including at least one of a cooling heat exchanger installed on a path through which hydrogen compressed and discharged from the hydrogen gas compressor is transferred to the compressed hydrogen storage tank, wherein the refrigerant reduced by the expansion valve is Heat exchange is performed in the compression heat removal unit, and the gas is recovered in the liquid separator.

According to an embodiment of the present invention, a gas refrigerant tank disposed on a refrigerant pipe connecting the refrigerant compressor and the refrigerant condenser to receive the gas refrigerant compressed by the refrigerant compressor, wherein the hydrogen gas in the liquid refrigerant tank A refrigerant pipe through which the high-pressure liquid refrigerant is supplied to the compressor is provided with an auxiliary booster for pressurizing the liquid refrigerant transferred to the hydrogen gas compressor by using the high-pressure gas refrigerant provided from the gas refrigerant tank.

According to an embodiment of the present invention, there is provided a gas refrigerant tank disposed on a refrigerant pipe connecting the refrigerant compressor and the refrigerant condenser to receive the gas refrigerant compressed by the refrigerant compressor; And a liquid separator installed on a path through which a refrigerant is provided to the refrigerant compressor to provide a gaseous refrigerant to the refrigerant compressor, and the gas refrigerant tank is connected to the hydrogen gas compressor through a refrigerant pipe, and the hydrogen gas compressor A high-pressure gas refrigerant for hydrogen gas compression is provided to the refrigerant, and the liquid refrigerant liquefied in the refrigerant condenser is transferred to the hydrogen cooler as a cooling source, and an expansion valve for a hydrogen cooler is provided in the refrigerant line through which the refrigerant is transferred to the hydrogen cooler. The refrigerant provided to the hydrogen gas compressor and the hydrogen cooler becomes the liquid separator.

According to an embodiment of the present invention, the hydrogen compression unit includes a condenser into which the gaseous refrigerant discharged after the hydrogen gas is compressed by the hydrogen gas compressor is introduced, and an expansion valve into which the refrigerant liquefied in the condenser is introduced, The hydrogen compression unit removes compressed heat including at least one of a cooling jacket formed in the hydrogen gas compressor and a cooling heat exchanger installed on a path through which hydrogen compressed and discharged from the hydrogen gas compressor is transferred to the compressed hydrogen storage tank A portion, and the refrigerant depressurized by the expansion valve performs heat exchange in the compression heat removal unit and is recovered in a gaseous state to the liquid separator.

According to an embodiment of the present invention, a liquid refrigerant tank for accommodating the refrigerant liquefied in the refrigerant condenser is provided in the refrigerant pipe at the outlet side of the refrigerant condenser, and the refrigerant is provided from the liquid refrigerant tank to the expansion valve for the hydrogen cooler. .

According to an embodiment of the present invention, an auxiliary heat exchanger for heat exchange between the refrigerant introduced into the hydrogen cooler and the refrigerant discharged from the hydrogen cooler is further provided, and the expansion valve for the hydrogen cooler is provided between the auxiliary heat exchanger and the hydrogen cooler. It is installed in the refrigerant pipe through which the refrigerant is introduced into the hydrogen cooler.

According to an embodiment of the present invention, the hydrogen compression unit further includes a direction switching valve for switching the flow direction of the refrigerant selectively introduced into one inlet port of the hydrogen gas compressor or selectively discharged from the other outlet port.

According to the hydrogen compression cooling system according to the present invention having the configuration as described above, by unifying the compression source for hydrogen compression and the cooling source required for hydrogen cooling with the refrigerant provided from the cooling module unit, hydraulic pressure, which is the power source of the conventional hydrogen compression unit. Since the use of pumps or gas boosters can be excluded, not only manufacturing costs but also power costs can be reduced, and efficient power performance can be exhibited, thus reducing manufacturing costs as well as maintenance costs such as oil change of conventional pumps. There is an advantage that can be promoted.

According to the present invention, since the heat of compression generated during hydrogen gas compression can be removed by utilizing the refrigerant used for hydrogen gas compression, it is possible to provide a more stable hydrogen compression cooling system while simplifying the structure.

According to the present invention, a refrigerant compressed by a refrigerant compressor of a cooling module used as a cooling source is used as a pressurizing source for a hydrogen gas compressor, and a low-pressure liquid refrigerant discharged after compression is expanded under reduced pressure and used as a cooling source. It is possible to configure so that the compression heat generated during hydrogen gas compression can be removed by using the refrigerant used for hydrogen gas compression without using a separate cooling device, so the compression and cooling of hydrogen gas are integrated. Makes it possible to provide a customized device.

1 is a view for explaining a hydrogen compression cooling system according to a first embodiment of the present invention.
2 is a view for explaining a hydrogen compression cooling system according to a second embodiment of the present invention.

The present invention will be described in detail in the text, since various modifications can be made and various forms can be obtained. However, this is not intended to limit the present invention to a specific form of disclosure, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals have been used for similar elements.

The above terms are used only for the purpose of distinguishing one component from another component. The terms used in the present 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 indicates otherwise.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are configuration diagrams of a hydrogen compression cooling system according to an embodiment of the present invention.

The hydrogen compression cooling system according to an embodiment of the present invention includes a hydrogen compression unit 200, a compressed hydrogen storage tank 300, a hydrogen cooler 400, a cooling module unit 500, a dispenser 600, a power supply unit ( 800).

The hydrogen compression unit 200 includes a hydrogen gas compressor 220 for compressing hydrogen supplied from the gaseous hydrogen storage tank 100. The hydrogen gas compressor 220 is provided to compress hydrogen supplied from the gaseous hydrogen storage tank 100 to a pressure suitable for filling into a device using hydrogen.

For example, the pressure of gaseous hydrogen in the hydrogen gas compressor 220 may be set in consideration of an appropriate pressure of compressed hydrogen used by the hydrogen fuel cell vehicle. For example, when the hydrogen storage container 700 of a hydrogen fuel cell vehicle using hydrogen as a fuel is adopted to store hydrogen of 700 bar or less, the hydrogen gas compressor 220 may compress gaseous hydrogen to 900 bar or more. However, the present invention is not limited thereto, and the hydrogen pressure compressed by the hydrogen gas compressor 200 may be set according to an apparatus using hydrogen.

The gaseous hydrogen storage tank 100 stores hydrogen to be provided to the hydrogen gas compressor 220.

The hydrogen compression cooling system according to an embodiment of the present invention may form part of a hydrogen station fixed on the ground. The hydrogen station receives the hydrogen produced in the hydrogen production facility through a transfer trailer or the like, stores it in the gaseous hydrogen storage tank 100, and provides it to the hydrogen gas compressor 200.

The hydrogen compression cooling system according to an embodiment of the present invention may form part of a mobile hydrogen station mounted on a mobile vehicle. In this case, the gaseous hydrogen storage tank 100 may be a hydrogen gas storage facility connected from the hydrogen production device or a hydrogen gas storage facility in which hydrogen produced by the hydrogen production device is transferred and stored.

The mobile hydrogen station receives hydrogen from the hydrogen gas storage facility, compresses it in the hydrogen gas compressor 220, stores it in the compressed hydrogen storage tank 300, and then moves to the place where the customer is located. Thereafter, for example, compressed hydrogen may be provided to the hydrogen storage container 700 of a hydrogen fuel cell vehicle.

According to an embodiment of the present invention, the hydrogen gas compressor 220 of the hydrogen compression unit 200 compresses hydrogen gas using a high-pressure refrigerant provided to the cooling module unit 500. Hydrogen gas compressors that compress hydrogen using high-pressure liquids such as high-pressure gas and high-pressure oil as a pressure source are known, and various structures such as reciprocating, single-acting, and two-stage single-acting are available in a method using a cylinder and a piston. It is known.

As a high-pressure refrigerant used as a pressure source in the hydrogen gas compressor 220, the first embodiment of the present invention uses a high-pressure liquid refrigerant, and according to the second embodiment of the present invention, a high-pressure gas refrigerant is used.

According to an embodiment of the present invention, the hydrogen compression unit 200 includes a compression heat removal unit for removing compression heat generated by compression of hydrogen gas using the refrigerant used in the hydrogen gas compressor 220.

According to an embodiment of the present invention, the compression heat removal unit includes a cooling jacket 222 provided with a hydrogen gas compressor 220. The refrigerant discharged from the hydrogen gas compressor 220 is provided to the cooling jacket 222 in a low pressure and low temperature state through an expansion valve 230. While passing through the cooling jacket 222, the refrigerant absorbs and vaporizes the compressed heat of hydrogen, thereby cooling the hydrogen gas compressor 220 and the compressed hydrogen gas therein.

In addition, according to an embodiment of the present invention, the compression heat removal unit may include a cooling heat exchanger 240. The cooling heat exchanger 240 is installed along a hydrogen pipeline on a path through which high-pressure hydrogen discharged from the hydrogen gas compressor 220 moves to the compressed hydrogen storage tank 300. The cooling heat exchanger 240 may remove compression heat through heat exchange between the refrigerant passing through the cooling jacket 222 and the high-pressure hydrogen discharged from the hydrogen gas compressor 220.

According to an embodiment of the present invention, the refrigerant movement path may first pass through the cooling jacket 222 and then move to the cooling heat exchanger 240, and the opposite may be made. That is, as a modification of the embodiment shown in the drawings, the refrigerant may be designed to move to the cooling jacket 222 after passing through the cooling heat exchanger 240.

The cooling jacket 222 and the cooling heat exchanger 240 function as evaporators of the cooling cycle. That is, while passing through the interior, the low-pressure liquid refrigerant absorbs and vaporizes the latent heat of evaporation through heat exchange, and cools the hydrogen gas compressor 220 and/or compressed hydrogen gas through such heat exchange.

The hydrogen compression unit 200 will be described in more detail below with reference to the first and second embodiments of the present invention.

The hydrogen compression unit 200 supplies compressed gaseous hydrogen to the compressed hydrogen storage tank 300.

The compressed hydrogen storage tank 300 may be a buffer tank for supplying the high-pressure hydrogen to the dispenser 600 while storing high-pressure hydrogen. The compressed hydrogen storage tank 300 may include a pressure gauge that measures the pressure of hydrogen supplied and discharged. Through this, it is possible to control the compression operation of the hydrogen gas compressor 220 so that the pressure of the compressed hydrogen storage tank 300 is maintained corresponding to the set pressure.

The hydrogen cooler 400 is provided for cooling the hydrogen gas supplied to the dispenser 600.

The dispenser 600 is connected to the compressed hydrogen storage tank 300 to supply hydrogen to the hydrogen storage container 700 mounted on a fuel cell vehicle using hydrogen as a fuel, and provides a hydrogen line shown by a chain two-dotted line. Through this, hydrogen is supplied to the hydrogen storage container 700 of the hydrogen fuel cell vehicle.

When the dispenser 600 fills the hydrogen storage container 700 with hydrogen, the temperature of the gaseous hydrogen in the hydrogen storage container 700, which is at a relatively low pressure compared to the compressed hydrogen storage tank 300 due to the Joule-Thomson effect, is Will rise. At this time, the temperature may be increased to the endurance temperature (eg, -40 ~ 80 ℃) related to the safety of the hydrogen storage container 700.

A hydrogen cooler 400 is provided to solve the problem of increasing the temperature of the hydrogen gas. The temperature of hydrogen supplied from the dispenser 600 to the hydrogen fuel cell vehicle is decreased by using the cold heat of the hydrogen cooler 400. That is, in order to prevent the gaseous hydrogen charged in the hydrogen storage container 700 of the hydrogen fuel cell vehicle from rising above the endurance temperature of the hydrogen storage container 700, the hydrogen cooler 400 is the endothermic heat generated when the refrigerant is evaporated. The temperature of gaseous hydrogen provided to the dispenser 600 is controlled to an appropriate temperature (eg, 80° C. or less) by using.

In the hydrogen cooler 400, the gaseous hydrogen transferred from the compressed hydrogen storage tank 300 and the refrigerant supplied from the cooling module unit 500 exchange heat, so that the hydrogen charged in the hydrogen storage container 700 of the hydrogen fuel cell vehicle By lowering the temperature, the hydrogen in the hydrogen storage container 700 may not rise above the endurance temperature.

According to the present invention, since both the refrigerant used as compression power in the hydrogen gas compressor 220 and the refrigerant used as a cooling source in the hydrogen cooler 400 are provided from the cooling module unit 500, the hydrogen gas compressor 220 It is possible to integrate without separately forming a pressure source for and a refrigerant source for the hydrogen cooler 400.

According to an embodiment of the present invention, the cooling module unit 500 includes a refrigerant compressor 510, a gas refrigerant tank 520, a refrigerant condenser 530, a liquid refrigerant tank 540, and a liquid separator 550. Can be.

The refrigerant compressor 510 compresses a gaseous refrigerant at high temperature and high pressure.

The gas refrigerant tank 520 accommodates the high-pressure gas refrigerant compressed by the refrigerant compressor 510. The gas refrigerant tank 520 is a buffer tank that temporarily stores a high-pressure gas refrigerant, and serves to deliver the high-pressure gas refrigerant to a connected refrigerant pipe.

The refrigerant condenser 530 liquefies the high-temperature and high-pressure gas refrigerant introduced from the gas refrigerant tank 520 into a low-temperature, high-pressure liquid refrigerant.

The liquid refrigerant tank 540 accommodates the liquid refrigerant condensed in the refrigerant condenser 530. As the liquid refrigerant tank 540, a known receiver may be used. The liquid refrigerant tank 540 temporarily stores the high-pressure refrigerant condensed and liquefied in the refrigerant condenser 530 and serves to deliver the high-pressure liquid refrigerant to the connected refrigerant pipe.

The liquid separator 550 is installed from the refrigerant pipe to the inlet side of the refrigerant compressor 510. The liquid separator 550 is used to prevent the liquid refrigerant from being sucked into the refrigerant compressor 550.

According to an embodiment of the present invention, the cooling module unit 500 is connected to the hydrogen cooler 400 through a refrigerant pipe to form a cooling cycle. An expansion valve 420 for a hydrogen cooler is installed in a refrigerant pipe in a path through which the refrigerant is introduced into the hydrogen cooler 400.

The low temperature and high pressure liquid refrigerant generated in the refrigerant condenser 530 may be supplied to the hydrogen cooler 400 via the liquid refrigerant tank 540. The low-temperature and high-pressure liquid refrigerant supplied to the hydrogen cooler 400 goes through the expansion valve 420 for the hydrogen cooler and becomes low-temperature and low pressure, and is evaporated in the hydrogen cooler 400, and the dispenser 600 from the compressed hydrogen storage tank 300. ) To cool the hydrogen gas supplied to it. The refrigerant discharged from the hydrogen cooler 400 flows into the liquid separator 550.

In addition, according to an embodiment of the present invention, the cooling module unit 500 may be connected to the hydrogen compression unit 200 through a refrigerant channel to form an additional cooling cycle.

According to the first embodiment of the present invention, after the high-pressure liquid refrigerant supplied from the liquid refrigerant tank 540 is used as a pressure source for hydrogen gas compression in the hydrogen gas compressor 220, the expansion valve 230 and cooling After passing through the jacket 223 and/or the cooling heat exchanger 240, it is introduced into the liquid separator 550.

According to the second embodiment of the present invention, the high-pressure gas refrigerant supplied from the gas refrigerant tank 520 is used as a pressure source for hydrogen gas compression in the hydrogen gas compressor 220, and then expanded with the condenser 225. After passing through the valve 230 and the cooling jacket 223 and/or the cooling heat exchanger 240, it is introduced into the liquid separator 550.

The hydrogen compression cooling system according to an embodiment of the present invention includes a power supply (800). The power provided to the power supply device 800 may be engine power or electric power. The power supply device 800 drives the refrigerant compressor 510 by providing the driving force of the engine or the driving force of the motor by electric power to the cooling module unit 500.

The hydrogen compression cooling system according to the present invention includes a conduit that connects each of the internal elements to enable the movement of hydrogen and refrigerant. In this specification, this is referred to as a hydrogen line and a refrigerant line as a whole. In the drawing, the hydrogen line is a path through which hydrogen moves from the gaseous hydrogen storage tank 100 to the hydrogen storage container 700 of the hydrogen fuel cell vehicle, and is indicated by a double-dashed line. In addition, the refrigerant line forms a refrigerant movement path inside the cooling module part 500 and a path through which the refrigerant provided from the cooling module part 500 is transferred to and returned to the hydrogen compression part 200 and the hydrogen cooler 400. The movement path of the refrigerant is indicated by a dotted line and the movement path of the liquid refrigerant is indicated by a solid line.

(First embodiment)

1 is a block diagram illustrating a hydrogen compression cooling system according to a first embodiment of the present invention.

According to the hydrogen compression cooling system according to the first embodiment of the present invention shown in FIG. 1, the high-pressure liquid refrigerant provided from the cooling module unit 500 is used as a pressure source for compressing hydrogen gas in the hydrogen gas compressor 220. Is used.

The refrigerant compressor 510 is driven by the power supply device 800 to compress the gaseous refrigerant at high temperature and high pressure. The high-pressure gaseous refrigerant compressed in the refrigerant compressor 510 is introduced into the refrigerant condenser 530 through the gas refrigerant tank 520. The refrigerant condenser 530 liquefies the high-temperature and high-pressure gas refrigerant from the gas refrigerant tank 520 into a low-temperature, high-pressure liquid refrigerant, and then provides it to the liquid refrigerant tank 540.

According to the first embodiment of the present invention, the low-temperature, high-pressure liquid refrigerant condensed in the refrigerant condenser 530 is supplied to the hydrogen gas compressor 220 through the liquid refrigerant tank 540, and is used to compress hydrogen to a high pressure. I can.

According to the first embodiment of the present invention, the hydrogen compression unit 200 may include a hydrogen gas compressor 220, an auxiliary booster 210, an expansion valve 230, and a compression heat removal unit. In addition, it may include a direction switching valve (250).

The auxiliary booster 210 is installed on a path through which liquid refrigerant is provided from the liquid refrigerant tank 540 of the cooling module unit 500 to the hydrogen gas compressor 220. The auxiliary booster 210 functions to pressurize the liquid refrigerant provided to the hydrogen gas compressor 220 to boost the pressure.

According to the first embodiment of the present invention, the auxiliary booster 210 boosts the liquid refrigerant by using the high-pressure refrigerant gas provided from the gas refrigerant tank 520 as a pressure source. On the other hand, the high-pressure gas refrigerant provided as a pressure source from the gas refrigerant tank 520 to the auxiliary booster 210 is converted into a low-pressure gas refrigerant and is recovered to the liquid separator 550 of the cooling module unit 500.

The high-pressure liquid refrigerant provided toward the hydrogen gas compressor 220 through the liquid refrigerant tank 540 flows into the hydrogen gas compressor 220 through the direction switching valve 250.

The direction switching valve 250 controls the flow of the refrigerant so that the high-pressure liquid refrigerant flowing into the hydrogen gas compressor 220 can control the movement of the piston of the hydrogen gas compressor 220. The flow direction of the refrigerant may be switched so that the refrigerant is selectively introduced into one inlet port of the hydrogen gas compressor 220 or selectively discharged from the other outlet port.

The liquid refrigerant discharged from the hydrogen gas compressor 220 flows into the expansion valve 230. The expansion valve 230 decompresses the liquid refrigerant discharged from the hydrogen gas compressor 220.

The refrigerant passing through the expansion valve 230 is transferred to the compression heat removal unit. As described above, the compression heat removal unit includes a cooling jacket 222 and a cooling heat exchanger 240. The compression heat removal unit includes at least one of a cooling jacket 222 and a cooling heat exchanger 240.

Referring to FIG. 1, the refrigerant discharged from the hydrogen gas compressor 220 passes through the direction switching valve 250 and moves to the expansion valve 230, and is introduced into the cooling jacket 222 of the hydrogen gas compressor 220. In addition, the refrigerant discharged from the cooling jacket 222 is introduced into the cooling heat exchanger 240.

In the cooling jacket 222 and the cooling heat exchanger 240 constituting the compression heat removal unit, the low-temperature, low-pressure liquid refrigerant whose pressure is lowered in the expansion valve 230 is vaporized, and the cold heat generated by the vaporization is vaporized by the hydrogen gas compressor 220. And the high-pressure hydrogen compressed by the hydrogen gas compressor 220. Through this, the heat of compression of hydrogen is removed and the high pressure hydrogen is cooled.

According to an embodiment of the present invention, the refrigerant line may be formed so that the refrigerant first passes through the cooling jacket 222 and then moves to the cooling heat exchanger 240 or vice versa. That is, a refrigerant line may be formed so that the refrigerant moves to the cooling jacket 222 after passing through the cooling heat exchanger 240. However, in consideration of the interference with the surrounding space and the installation space, the refrigerant line may be formed so that the refrigerant first passes through the cooling jacket 222 and then moves to the cooling heat exchanger 240.

The high-pressure hydrogen compressed by the hydrogen gas compressor 220 and cooled by the cooling heat exchanger 240 moves to the compressed hydrogen storage tank 300. In addition, the refrigerant discharged from the cooling heat exchanger 240 is recovered to the liquid separator 550 of the cooling module unit 500 in the state of a low pressure gaseous refrigerant, and flows back into the refrigerant compressor 510.

Looking at the cooling cycle formed by the refrigerant provided from the cooling module unit 500 to the hydrogen compression unit 200, the refrigerant includes a refrigerant compressor 510, a refrigerant condenser 530, an expansion valve 230, and the compression heat removal. A cooling cycle is formed while circulating the female cooling jacket 222 and/or the cooling heat exchanger 240. The cooling jacket 222 and the cooling heat exchanger 240 function as a vaporizer in which the refrigerant is vaporized while absorbing heat.

On the other hand, as described above, looking at the cooling cycle formed by the refrigerant provided from the cooling module unit 500 to the hydrogen cooler 400, the refrigerant is a refrigerant compressor 510, a refrigerant condenser 530, and a hydrogen cooler. A cooling cycle is formed while circulating the expansion valve 420 and the hydrogen cooler 400. The hydrogen cooler 400 functions as a vaporizer in which the refrigerant is vaporized while absorbing heat.

According to the first embodiment of the present invention, an auxiliary heat exchanger 410 for heat exchange between a liquid refrigerant directed toward the hydrogen cooler 400 and a gaseous refrigerant discharged from the hydrogen cooler 400 may be further provided. At this time, the expansion valve 420 for the hydrogen cooler is installed in the refrigerant pipe on the moving path of the liquid refrigerant between the auxiliary heat exchanger 410 and the hydrogen cooler 400.

The auxiliary heat exchanger 420 provides cooling to the liquid refrigerant directed to the hydrogen cooler 400 so that the cooling performance in the hydrogen cooler 400 is improved.

The low pressure gaseous refrigerant discharged from the cooling heat exchanger 240 and the auxiliary booster 210 meets the gaseous refrigerant passing through the auxiliary heat exchanger 420 in the downstream of the auxiliary heat exchanger 420 and flows into the liquid separator 550 .

(2nd embodiment)

2 is a block diagram illustrating a hydrogen compression cooling system according to a second embodiment of the present invention. Hereinafter, in describing the second embodiment of the hydrogen compression cooling system according to the present invention, the same components as those of the first embodiment of the present invention and components having the same function are used with the same component numbers, and in order to avoid repetitive configurations, these components Detailed description of is omitted.

According to the hydrogen compression cooling system according to the second embodiment of the present invention shown in FIG. 2, the high-pressure gas refrigerant provided from the cooling module unit 500 is used as a pressure source for compressing hydrogen gas in the hydrogen gas compressor 220. Is used.

The refrigerant compressor 510 is driven by the power supply device 800 to compress the gaseous refrigerant at high pressure and transfer it to the gaseous refrigerant tank 520.

According to the second embodiment of the present invention, a high-pressure gas refrigerant is supplied from the gas refrigerant tank 520 of the cooling module unit 500 to the hydrogen gas compressor 220 and is used to compress the hydrogen gas at high pressure.

According to the second embodiment of the present invention, the hydrogen compression unit 200 includes a hydrogen gas compressor 220, a pressure regulator 215, a condenser 225, an expansion valve 230, a cooling heat exchanger 240, and a direction It may include a switching valve 250.

The pressure regulator 215 functions to uniformly adjust the pressure of the high-temperature, high-pressure gas refrigerant discharged from the gas refrigerant tank 520. The gaseous refrigerant that has passed through the pressure regulator 215 is provided to the hydrogen gas compressor 220 and is used to compress the hydrogen gas provided from the gas gas storage tank 100 to a high pressure.

In this case, the input/output direction of the high-pressure refrigerant gas may be controlled through the direction switching valve 250.

The gaseous refrigerant discharged from the hydrogen gas compressor 220 flows into the condenser 225. Referring to FIG. 2, the gaseous refrigerant discharged from the hydrogen gas compressor 220 passes through the directional valve 250 and passes through the condenser 225 to be liquefied at low temperature and high pressure. Then, the pressure is reduced by moving to the expansion valve 230, and then introduced into the cooling jacket 222 of the hydrogen gas compressor 220. In addition, the refrigerant discharged from the cooling jacket 222 is introduced into the cooling heat exchanger 240.

In the cooling jacket 222 and the cooling heat exchanger 240 constituting the compression heat removal unit, the low-temperature, low-pressure liquid refrigerant whose pressure is lowered in the expansion valve 230 is vaporized, and the cold heat generated by the vaporization is vaporized by the hydrogen gas compressor 220. And the high-pressure hydrogen compressed by the hydrogen gas compressor 220. Through this, the heat of compression of hydrogen is removed and the high pressure hydrogen is cooled. The cooling jacket 222 cools the hydrogen gas compressor 220 to prevent damage to components in the hydrogen gas compressor 220 and removes compressed heat generated from the hydrogen gas compressor 220. The cooling heat exchanger 240 is installed between the hydrogen gas compressor 220 and the hydrogen line of the compressed hydrogen storage tank 300 to remove compressed heat in the compressed hydrogen gas.

The refrigerant discharged from the cooling heat exchanger 240 is recovered to the liquid separator 550 of the cooling module unit 500 in the state of a low pressure gaseous refrigerant and flows back into the refrigerant compressor 510.

Looking at the cooling cycle formed by the refrigerant provided from the cooling module unit 500 to the hydrogen compression unit 200, the refrigerant includes a refrigerant compressor 510, a condenser 225, an expansion valve 230, and a compression heat removal unit. A cooling cycle is formed while circulating the cooling jacket 222 and/or the cooling heat exchanger 240.

Looking at the cooling cycle formed by the refrigerant provided from the cooling module unit 500 to the hydrogen cooler 400, the refrigerant includes a refrigerant compressor 510, a refrigerant condenser 530, an expansion valve 420 for a hydrogen cooler, and hydrogen. A cooling cycle is formed while circulating the cooler 400.

In the second embodiment of the present invention, as in the first embodiment, a secondary heat exchanger 410 for heat exchange between a liquid refrigerant directed toward the hydrogen cooler 400 and a gaseous refrigerant discharged from the hydrogen cooler 400 is provided. It may be further provided. At this time, the expansion valve 420 for the hydrogen cooler is installed on the moving path of the liquid refrigerant between the auxiliary heat exchanger 410 and the hydrogen cooler 400.

According to the hydrogen compression cooling system according to the embodiment of the present invention, the high-pressure refrigerant provided from the cooling module unit 500 is used as power for compressing hydrogen gas in the hydrogen gas compressor 220. Therefore, it is possible to eliminate the use of a separate hydraulic pump or gas booster, thereby reducing not only manufacturing cost but also power cost.

In addition, by unifying the pressure source for hydrogen compression and the cooling source for hydrogen cooling with the refrigerant provided from the cooling module unit 500, efficient power performance can be exhibited. In addition, it is possible to reduce the manufacturing cost as well as the maintenance cost such as oil change of the conventional pump.

In addition, according to an embodiment of the present invention, a non-flammable refrigerant such as carbon dioxide may be used as the refrigerant of the cooling module unit 500.

Because hydrogen is flammable due to its nature, special measures are required for safety. In particular, a lot of compression heat may be generated in the process of compressing hydrogen at an ultra-high pressure in a hydrogen gas compressor. By the way, according to an embodiment of the present invention, the hydrogen gas compressor 220 compresses hydrogen gas using the refrigerant of the cooling module unit 500, and at this time, when the refrigerant is carbon dioxide, carbon dioxide, which is a refrigerant, leaks when the device is damaged to extinguish. As it functions as a gas, it is free from fire hazard.

In addition, according to an embodiment of the present invention, a fire extinguishing gas line capable of discharging a non-flammable refrigerant gas from the cooling module unit 500 as a fire extinguishing gas may be additionally formed. That is, by installing a gas line for fire extinguishing in the gas refrigerant tank 520, it can be used as fire fighting gas in an emergency.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains can understand that it is possible to easily transform it into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: gaseous hydrogen storage tank 200: hydrogen compression unit
220: hydrogen gas compressor 222: cooling jacket
240: cooling heat exchanger 300: compressed hydrogen storage tank
400: hydrogen cooler 500: cooling module unit
510; Refrigerant compressor 530: refrigerant condenser

Claims (10)

A hydrogen compression unit including a hydrogen gas compressor for compressing gaseous hydrogen supplied from the gaseous hydrogen storage tank to a set pressure using a compressed refrigerant;
A compressed hydrogen storage tank for storing compressed hydrogen compressed by the hydrogen gas compressor;
A hydrogen cooler for cooling hydrogen supplied from the compressed hydrogen storage tank to a dispenser by using heat transfer occurring when the refrigerant provided as a cooling source evaporates; And
Includes; a cooling module unit for providing a compressed refrigerant as a compression source of hydrogen gas to the hydrogen gas compressor and providing a refrigerant as a cooling source to the hydrogen cooler,
The cooling module part,
A refrigerant compressor for compressing gaseous refrigerant at high pressure; And
A refrigerant condenser for liquefying the high-pressure gas refrigerant compressed by the refrigerant compressor into a high-pressure liquid refrigerant,
The compressed refrigerant supplied from the cooling module unit to the hydrogen gas compressor is one of a high-pressure liquid refrigerant liquefied in the refrigerant condenser and a high-pressure gas refrigerant compressed in the refrigerant compressor.
delete The method of claim 1,
A liquid refrigerant tank for storing the liquid refrigerant condensed in the refrigerant condenser; And
And a liquid separator installed on a path through which a refrigerant is provided to the refrigerant compressor so that a gaseous refrigerant can be supplied to the refrigerant compressor,
The liquid refrigerant tank is connected to the hydrogen gas compressor through a refrigerant pipe to provide a high-pressure liquid refrigerant for compressing hydrogen gas to the hydrogen gas compressor, and is connected to the hydrogen cooler to provide a high-pressure liquid refrigerant to be used as a cooling source. ,
An expansion valve for a hydrogen cooler is provided in a path through which the refrigerant is transferred from the liquid refrigerant tank to the hydrogen cooler,
The hydrogen compression cooling system, characterized in that the refrigerant provided to the hydrogen gas compressor and the hydrogen cooler is recovered to the liquid separator.
The method of claim 3,
The hydrogen compression unit includes an expansion valve provided for compression of hydrogen gas in the hydrogen gas compressor and into which the discharged liquid refrigerant is introduced,
The hydrogen compression unit removes compressed heat including at least one of a cooling jacket formed in the hydrogen gas compressor and a cooling heat exchanger installed on a path through which hydrogen compressed and discharged from the hydrogen gas compressor is transferred to the compressed hydrogen storage tank Includes wealth,
A hydrogen compression cooling system, characterized in that the refrigerant depressurized by the expansion valve performs heat exchange in the compression heat removal unit and is recovered in a gaseous state to the liquid separator.
The method of claim 3,
And a gas refrigerant tank disposed on a refrigerant pipe connecting the refrigerant compressor and the refrigerant condenser to receive the gas refrigerant compressed by the refrigerant compressor,
A refrigerant pipe through which high-pressure liquid refrigerant is supplied from the liquid refrigerant tank to the hydrogen gas compressor is provided with an auxiliary booster for pressurizing the liquid refrigerant transferred to the hydrogen gas compressor using the high-pressure gas refrigerant provided from the gas refrigerant tank. Hydrogen compression cooling system.
The method of claim 1,
A gas refrigerant tank disposed on a refrigerant pipe connecting the refrigerant compressor and the refrigerant condenser to receive the gas refrigerant compressed by the refrigerant compressor;
And a liquid separator installed on a path through which a refrigerant is provided to the refrigerant compressor so that a gaseous refrigerant can be provided to the refrigerant compressor,
The gas refrigerant tank is connected to the hydrogen gas compressor through a refrigerant pipe to provide a high-pressure gas refrigerant for compressing hydrogen gas to the hydrogen gas compressor,
The liquid refrigerant liquefied in the refrigerant condenser is transferred to the hydrogen cooler as a cooling source, and an expansion valve for a hydrogen cooler is provided in a refrigerant pipe through which the refrigerant is transferred to the hydrogen cooler,
The hydrogen compression cooling system, characterized in that the refrigerant provided to the hydrogen gas compressor and the hydrogen cooler is recovered to the liquid separator.
The method of claim 6,
The hydrogen compression unit includes a condenser into which the gaseous refrigerant discharged after the hydrogen gas is compressed by the hydrogen gas compressor is introduced, and an expansion valve into which the refrigerant liquefied in the condenser is introduced,
The hydrogen compression unit removes compressed heat including at least one of a cooling jacket formed in the hydrogen gas compressor and a cooling heat exchanger installed on a path through which hydrogen compressed and discharged from the hydrogen gas compressor is transferred to the compressed hydrogen storage tank Includes wealth,
A hydrogen compression cooling system, characterized in that the refrigerant depressurized by the expansion valve performs heat exchange in the compression heat removal unit and is recovered in a gaseous state to the liquid separator.
The method of claim 6,
A liquid refrigerant tank accommodating the refrigerant liquefied in the refrigerant condenser is provided in the refrigerant pipe at the outlet side of the refrigerant condenser,
Hydrogen compression cooling system, characterized in that the refrigerant is provided from the liquid refrigerant tank to the expansion valve for the hydrogen cooler.
The method according to claim 3 or 6,
An auxiliary heat exchanger for heat exchange between the refrigerant introduced into the hydrogen cooler and the refrigerant discharged from the hydrogen cooler is further provided,
The hydrogen compression cooling system, characterized in that the expansion valve for the hydrogen cooler is installed in a refrigerant line between the auxiliary heat exchanger and the hydrogen cooler into which refrigerant is introduced into the hydrogen cooler.
The method according to claim 4 or 7,
The hydrogen compression unit,
A hydrogen compression cooling system, characterized in that the hydrogen compression cooling system further comprises a direction switching valve for switching the flow direction of the refrigerant selectively introduced into one inlet port of the hydrogen gas compressor or selectively discharged from the other outlet port.

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