Hydrogen station

Abstract

To provide: a hydrogen station which can reduce a power consumption amount compared with prior art, and can reduce an environmental load; a hydrogen gas cooling system; and a hydrogen gas cooling method.SOLUTION: A hydrogen station 300 comprises: a hydrogen compressor 301 for compressing a hydrogen gas; a pressure accumulator 302 for storing the hydrogen gas which is compressed by the hydrogen compressor 301; a pre-cool heat exchanger 303 for cooling, by heat exchange, the hydrogen gas supplied from the pressure accumulator 302; and a liquefied nitrogen supply line L5 for supplying liquefied nitrogen to the pre-cool heat exchanger 303. The hydrogen station supplies the liquefied nitrogen to the pre-cool heat exchanger 303 through the liquefied nitrogen supply line L5, cools the hydrogen gas supplied from the pressure accumulator 302 by heat exchange, and supplies, to a nitrogen gas use place 401, the nitrogen gas which is evaporated by heat exchange with the hydrogen gas in the pre-cool heat exchanger 303.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hydrogen station, a hydrogen gas cooling system, and a hydrogen gas cooling method. [Background technology]

[0002] At hydrogen stations that supply high-pressure hydrogen gas, which is the fuel for fuel cell vehicles, a pre-cooling system is used to cool the hydrogen gas to a target cooling temperature (-40°C to -33°C) before it is filled in order to prevent the temperature of the fuel tank from rising due to rapid hydrogen gas filling.

[0003] As a conventional technology, there is a gas supply system that supplies gas to a filling facility that fills a tank-mounted device with gas, the gas supply system comprising: a compressor unit having a drive unit and a compression unit that is driven by the drive unit to compress the gas; and a pre-cool system that cools the gas that flows into the filling facility from a pressure accumulator unit, the pre-cool system being of non-explosion-proof specification and being disposed in a non-explosion-proof portion of the inside of a housing in which at least a portion of the pre-cool system is disposed, the gas supply system further comprising a control unit that controls the compressor unit and the pre-cool system, the pre-cool system being a brine circuit that uses brine to cool the gas flowing through the filling facility. A hydrogen station is known which comprises a gas supply system in which the evaporator section comprises a refrigerant compressor section comprises a refrigerant compressor that compresses the refrigerant flowing out from the evaporator section, a condenser section comprises a condenser section comprises a refrigerant compressed in the refrigerant compressor section by air flow, and an expansion section comprises a refrigerant compressor that expands the refrigerant flowing out from the condenser section, the evaporator section, the refrigerant compressor section and the expansion section are disposed in the non-explosion-proof section of the housing, and the gas supply system comprises a filling equipment and the gas supply system that supplies hydrogen gas to the filling equipment, the filling equipment filling a tank-mounted device with hydrogen gas (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6518291 Summary of the Invention [Problem to be solved by the invention]

[0005] The hydrogen station 10 described in Patent Document 1 has a problem of high power consumption because an electric motor is used in the refrigerant compression section of the refrigerator 3 used to cool the brine in the pre-cool system 24. In addition, the refrigerator 3 uses a fluorocarbon-based refrigerant as the refrigerant to cool the brine, which places a high burden on the environment.

[0006] An object of the present invention is to provide a hydrogen station, a hydrogen gas cooling system, and a hydrogen gas cooling method that can reduce power consumption and the environmental load compared to conventional methods. [Means for solving the problem]

[0007] [1] A hydrogen station comprising: a hydrogen compressor that compresses hydrogen gas; a pressure accumulator that stores the hydrogen gas compressed by the hydrogen compressor; a pre-cooling heat exchanger that cools the hydrogen gas supplied from the pressure accumulator by heat exchange; and a liquefied nitrogen supply line that supplies liquefied nitrogen to the pre-cooling heat exchanger, A hydrogen station characterized in that liquefied nitrogen is supplied to the pre-cool heat exchanger through the liquefied nitrogen supply line, hydrogen gas supplied from the accumulator is cooled by heat exchange, and nitrogen gas vaporized by heat exchange with the hydrogen gas in the pre-cool heat exchanger is supplied to a nitrogen gas usage location. [2] The hydrogen station described in [1], further comprising a nitrogen gas outlet line for supplying the nitrogen gas vaporized by heat exchange in the pre-cool heat exchanger to the hydrogen compressor. [3] Further, a nitrogen gas supply line is provided for drawing out liquefied nitrogen from a liquefied nitrogen storage tank and supplying the nitrogen gas vaporized by an evaporator to the hydrogen compressor; The evaporator is installed inside or outside the hydrogen station, The liquefied nitrogen tank is installed inside or outside the hydrogen station. A hydrogen station as described in [1] or [2]. [4] A hydrogen gas supply system comprising: a hydrogen gas container; a hydrogen gas supply line that supplies hydrogen gas to the hydrogen gas container; and a bypass line that bypasses the hydrogen gas supply line; The hydrogen station according to any one of [1] to [3], wherein in the pre-cooling heat exchanger, heat is exchanged between the hydrogen gas in the bypass line and the liquefied nitrogen in the liquefied nitrogen supply line. [5] Further comprising: a pressure measuring means disposed between the bypass end point of the bypass line and the hydrogen gas filled container; a first flow rate adjusting means disposed on the bypass line; and a second flow rate adjusting means disposed on the hydrogen gas supply line between the bypass start point and the bypass end point of the bypass line; The hydrogen station described in [4], wherein the first flow rate adjustment means and the second flow rate adjustment means are controlled based on the value measured by the pressure measurement means to adjust the flow rate of hydrogen gas in the bypass line and the flow rate of gas in the hydrogen gas supply line. [6] Further, a gas temperature measuring means is provided between the bypass end point of the bypass line and the hydrogen gas filling vessel, The hydrogen station described in [5], wherein the first flow rate adjustment means and the second flow rate adjustment means are controlled based on the value measured by the gas temperature measurement means to adjust the flow rate of hydrogen gas in the bypass line and the flow rate of hydrogen gas in the hydrogen gas supply line. [7] Further, a first flow rate measuring means is disposed on the bypass line, The hydrogen station described in [4], which supplies liquefied nitrogen based on the value measured by the first flow rate measuring means. [8] A hydrogen compressor that compresses hydrogen gas, a pressure accumulator that stores the hydrogen gas compressed by the hydrogen compressor, a pre-cool heat exchanger that cools the hydrogen gas supplied from the pressure accumulator by heat exchange, a liquefied nitrogen supply line that supplies liquefied nitrogen to the pre-cool heat exchanger, and a heat exchanger outlet temperature measuring means that is arranged downstream of the pre-cool heat exchanger in the liquefied nitrogen supply line and that measures the outlet temperature of the pre-cool heat exchanger; A hydrogen gas cooling system that adjusts the flow rate of liquid nitrogen in the liquefied nitrogen supply line based on the value measured by the heat exchanger outlet temperature measuring means. [9] The hydrogen gas cooling system described in [8], wherein the precooling heat exchanger is a double-pipe heat exchanger.

[10] A hydrogen gas cooling system as described in [8] or [9], wherein the liquefied nitrogen supply line supplies liquefied nitrogen to the pre-cool heat exchanger from a liquefied nitrogen storage tank installed inside or outside the hydrogen gas cooling system.

[11] A method for cooling hydrogen gas at a hydrogen station comprising: a hydrogen compressor for compressing hydrogen gas; a pressure accumulator for storing the hydrogen gas compressed by the hydrogen compressor; a pre-cooling heat exchanger for cooling the hydrogen gas supplied from the pressure accumulator by heat exchange; and a liquefied nitrogen supply line for supplying liquefied nitrogen to the pre-cooling heat exchanger, A hydrogen gas cooling method, comprising: supplying liquefied nitrogen to the pre-cool heat exchanger through the liquefied nitrogen supply line, cooling the hydrogen gas supplied from the accumulator by heat exchange, and supplying the nitrogen gas vaporized by heat exchange with the hydrogen gas in the pre-cool heat exchanger to a nitrogen gas usage location.

[12] The hydrogen gas cooling method described in

[11] , wherein nitrogen gas vaporized by heat exchange with hydrogen gas in the pre-cooling heat exchanger is supplied to the hydrogen compressor and used as power for the hydrogen compressor.

[13] The hydrogen gas cooling method described in

[11] or

[12] , wherein the liquefied nitrogen supply line supplies liquefied nitrogen to the pre-cool heat exchanger from a liquefied nitrogen storage tank installed inside or outside the hydrogen station. Effect of the Invention

[0008] According to the present invention, it is possible to provide a hydrogen station, a hydrogen gas cooling system, and a hydrogen gas cooling method that can reduce power consumption compared to conventional methods and reduce the environmental load. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a hydrogen station according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view of a double-pipe heat exchanger. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of a hydrogen station, a hydrogen gas cooling system, and a hydrogen gas cooling method according to the present invention will be described in detail below with reference to Figures 1 and 2. However, the present invention is not limited to the embodiment described below, and various modifications are possible without departing from the gist of the present invention. In the present invention, a numerical range expressed using "~" includes the numerical values ​​on both sides of "~" within the range.

[0011] [Hydrogen station] FIG. 1 is a diagram showing a schematic configuration of a hydrogen station 300 according to one embodiment of the present invention. The hydrogen station 300 includes a hydrogen compressor 301 that compresses hydrogen gas, a pressure accumulator 302 that stores the hydrogen gas compressed by the hydrogen compressor 301, a pre-cool heat exchanger 303 that cools the hydrogen gas supplied from the pressure accumulator 302 by heat exchange, and a liquefied nitrogen supply line L5 that supplies liquefied nitrogen to the pre-cool heat exchanger 303.

[0012] The hydrogen station 300 supplies liquefied nitrogen to the pre-cool heat exchanger 303 through the liquefied nitrogen supply line L5, cools the hydrogen gas supplied from the pressure accumulator 302 by heat exchange, and supplies the nitrogen gas vaporized by heat exchange with the hydrogen gas in the pre-cool heat exchanger 303 to the nitrogen gas usage location 401.

[0013] The pre-cooling heat exchanger 303 cools the hydrogen gas supplied through the hydrogen gas line L2 and liquefied nitrogen supplied through the liquefied nitrogen supply line L5 by heat exchange between the hydrogen gas and the liquefied nitrogen. The cooled hydrogen gas is stored in a hydrogen gas filling container 304 and supplied to a fuel cell vehicle FCV. The evaporated nitrogen gas is supplied to a nitrogen gas usage location 401 via a nitrogen gas outlet line L7, a hydrogen compressor 301, and a nitrogen gas line L10. In this embodiment, the nitrogen gas usage location 401 is installed in a factory 400 outside the hydrogen station 300.

[0014] The pre-cooling heat exchanger 303 of this embodiment cools hydrogen gas with liquefied nitrogen, so there is no need to use a refrigerator that consumes a lot of power, as in the conventional pre-cooling heat exchanger, and therefore consumes low power. In addition, the pre-cooling heat exchanger 303 of this embodiment does not use a fluorocarbon-based refrigerant, as in the conventional pre-cooling heat exchanger, so the environmental impact is low. Furthermore, since liquefied nitrogen (approximately 77 K) is colder than the refrigerating machine's freon (approximately 220 K), it is possible to make the heat exchanger smaller and simpler. In addition, conventional pre-cooling heat exchangers required cooling twice, by first cooling the brine with the refrigeration machine's refrigeration gas and then cooling the hydrogen again with the brine, but the pre-cooling heat exchanger 303 of this embodiment can cool the hydrogen in a single heat exchange. As the pre-cooling heat exchanger 303, for example, a double-pipe heat exchanger shown in Fig. 2 can be used. The double-pipe heat exchanger has a simple structure and does not use a refrigerator, so maintenance is easy and there are few breakdowns because there are no sliding parts. The nitrogen gas generated by heat exchange with the hydrogen gas can be supplied to the nitrogen gas usage location 401 and can also be used as a power source for the hydrogen compressor 301.

[0015] The hydrogen compressor 301 is a compressor for compressing hydrogen gas supplied through the low-pressure hydrogen gas line L0. The hydrogen compressor 301 increases the pressure of the raw hydrogen gas to, for example, about 82 MPa. In one example of the hydrogen compressor 301 according to this embodiment, the hydrogen compressor 301 includes a compression section for compressing hydrogen gas and a drive section for driving the compression section. The compression section may employ a compression method such as a reciprocating type, a rotary type (screw type), a centrifugal type, or an axial flow type. The drive section may use, for example, an electric motor, gas (nitrogen gas), or the like as a power source. In the hydrogen compressor 301 of this embodiment, it is preferable to supply nitrogen gas that has been heat exchanged in the pre-cool heat exchanger 303 and vaporized to power the drive section. In this case, the hydrogen station 300 includes a nitrogen gas outlet line L7 for supplying nitrogen gas from the pre-cool heat exchanger 303 to the hydrogen compressor 301.

[0016] The nitrogen gas supplied to the hydrogen compressor 301 is not limited to that derived from the pre-cool heat exchanger 303. For example, the nitrogen gas may be nitrogen gas obtained by vaporizing liquefied nitrogen stored in a liquefied nitrogen storage tank 402 with an evaporator 403. In FIG. 1, the liquefied nitrogen storage tank 402 and the evaporator 403 are installed in a factory 400 in which a nitrogen gas usage location 401 is installed, but they do not necessarily have to be installed in the factory 400. For example, either or both of the liquefied nitrogen storage tank 402 and the evaporator 403 may be installed in the hydrogen station 300, or may be installed in a facility or equipment other than the hydrogen station 300 or the factory 400.

[0017] By driving the hydrogen compressor 301 with nitrogen gas, an electric motor like that required for conventional compressors is no longer necessary, making it possible to significantly reduce power consumption. It can be substituted with an air-driven hydrogen booster, is inexpensive, and is compact. Compared to the use of air in an air-driven hydrogen booster, an air compressor is not required, and there are no equipment costs, maintenance, noise, or building code regulations. Since the power source is nitrogen gas vaporized from liquefied nitrogen, it is possible to use nitrogen at a temperature lower than room temperature. In that case, it is expected that the temperature rise of the hydrogen booster will be suppressed, thereby reducing problems. Nitrogen gas used at hydrogen stations can be effectively reused in factories.

[0018] 1 includes a hydrogen gas container 304, a hydrogen gas supply line L3 that supplies hydrogen gas to the hydrogen gas container 304, and a bypass line L4 that bypasses the hydrogen gas supply line L3. The bypass line L4 encompasses the hydrogen gas line L2. In a pre-cool heat exchanger 303, heat is exchanged between the hydrogen gas in the bypass line L4 and the liquefied nitrogen in the liquefied nitrogen supply line L5. The hydrogen gas supply line L3 and the bypass line L4 are connected at a bypass line start point JCT1 and a bypass line end point JCT2. A first flow rate measurement means FM1, a first flow rate adjustment means V1, and a gas temperature measurement means T2 are disposed between a start point JCT1 of the bypass line L4 and the inlet of the pre-cool heat exchanger 303. In Fig. 1, the second flow rate measurement means FM2 and the second flow rate adjustment means V2 are disposed in this order from the upstream side, but the order is not limited to this. A gas temperature measuring means T1 is installed in the bypass line L4 between the outlet of the pre-cool heat exchanger 303 and the end point JCT2 of the bypass line. Between the start point JCT1 of the bypass line and the end point JCT2 of the bypass line of the hydrogen gas supply line L3, a second flow rate measurement means FM2, a second flow rate adjustment means V2, and a gas temperature measurement means T5 are arranged. In Fig. 1, the second flow rate measurement means FM2 and the second flow rate adjustment means V2 are arranged in this order from the upstream side, but the order is not limited to this.

[0019] On the hydrogen gas supply line L3 between the bypass line end point JCT2 of the bypass line L4 and the hydrogen gas filling vessel 304, one or both of a pressure measuring means P1 and a gas temperature measuring means T2 are disposed.

[0020] Based on values ​​measured by either or both of the pressure measuring means P1 and the gas temperature measuring means T2, the first flow rate control means V1 and the second flow rate control means V2 can be controlled to adjust the flow rate of hydrogen gas in the bypass line L4 and the flow rate of gas in the hydrogen gas supply line L3.

[0021] Furthermore, the amount of liquefied nitrogen supplied from the liquefied nitrogen supply line L5 may be adjusted based on the value measured by the first flow rate measuring means FM1 disposed on the bypass line L4.

[0022] By these means, the pressure of the hydrogen gas filled in the hydrogen gas filling vessel 304 can be set within a target hydrogen pressure range of 5 MPa to 82 MPa, and the target hydrogen temperature range of -40°C to -30°C, for example.

[0023] Furthermore, compared to conventional technology (cooling the entire amount of hydrogen), the amount of hydrogen gas to be cooled is reduced to about one-third, and the heat exchanger can be reduced to about one-third.Since the temperature of the hydrogen gas to be cooled is approximately the same as the temperature of the liquefied nitrogen, temperature control is simplified and cooling is possible with a simple heat exchanger such as a double-pipe heat exchanger (Figure 2), achieving low cost and space savings.

[0024] The liquefied nitrogen used on the factory 400 side is mostly used for applications in which nitrogen gas at room temperature is used, and the cold energy is not utilized. In the hydrogen station 300 and factory 400 of this embodiment, the liquefied nitrogen can be used to cool hydrogen gas in order to effectively utilize cold energy. The nitrogen gas used to cool hydrogen can also be used as power for the hydrogen compressor 301 (nitrogen-driven hydrogen gas booster), and the nitrogen gas is then supplied to the factory 400 side and used as usual. In addition, liquefied nitrogen can be drawn out from the liquefied nitrogen storage tank 402, and the nitrogen gas after heat exchange in the pre-cool heat exchanger 303 can be compressed in the mass flow controller MFC1 and used as the power for the hydrogen compressor (nitrogen-driven hydrogen booster). In this case, if the power required is insufficient using only the heat-exchanged nitrogen gas, it is also possible to draw out liquefied nitrogen from the liquefied nitrogen storage tank 402 using another line, vaporize it in the evaporator 403, and use the nitrogen gas compressed by the mass flow controller MFC2 as the power for the hydrogen compressor (nitrogen-driven hydrogen booster).

[0025] <How to use hydrogen stations> An example of how to use the hydrogen station 300 will be described below. (1) When a filling signal for the fuel cell vehicle FCV is input to a dispenser (not shown), the mass flow controller MFC1 starts control, and liquefied nitrogen flows into the pre-cool heat exchanger 303 through the liquefied nitrogen supply line L5, and pre-cooling of the pre-cool heat exchanger 303 begins.

[0026] (2) When the measurement value of the heat exchanger outlet temperature measuring means T3 reaches a predetermined cooling temperature, the pre-cooling of the pre-cool heat exchanger 303 is completed.

[0027] (3) Prepare for hydrogen filling with constant pressure increase rate control of the pressure measurement means P1 according to the filling protocol for the fuel cell vehicle FCV specified at the hydrogen station 300 (feedforward control).

[0028] (4) Feedforward I (hydrogen flow rate side): Based on tank information of the fuel cell vehicle FCV, etc., the opening information of the first flow rate control means V1 and the second flow rate control means V2 is set in advance until the end of filling so that the pressure increase rate is constant and the flow rates of the first flow rate control means V1 and the second flow rate control means V2 are approximately 1 / 3 and approximately 2 / 3, respectively.

[0029] (5) Feedforward II (liquefied nitrogen flow rate side): The liquefied nitrogen flow rate corresponding to the flow rate of the first flow rate measuring means FM1 calculated in Feedforward I is calculated, and the flow rate information of the mass flow controller MFC1 is set until the end of filling.

[0030] (6) Hydrogen filling is started. The first flow rate adjustment means V1 and the second flow rate adjustment means V2 are controlled (feedback control) so that the temperature of the hydrogen being filled into the fuel cell vehicle FCV (measured by the gas temperature measurement means T2) is cooled to a predetermined temperature and the pressure rise rate of the pressure measurement means P1 is kept constant.

[0031] (7) The flow rate of the mass flow controller MFC1 is controlled at the flow rate set by the feedforward II, but when the measurement value of the heat exchanger outlet temperature measurement means T3 exceeds a predetermined temperature, the flow rate is controlled to be increased until the temperature falls below the predetermined temperature.

[0032] (8) The nitrogen gas that has passed through the mass flow controller MFC1 is introduced into the hydrogen compressor 301 (nitrogen-driven hydrogen booster). At this time, moisture may be added as necessary.

[0033] (9) When the flow rate of nitrogen gas is equal to or less than the flow rate required for driving hydrogen gas, nitrogen gas obtained by evaporating liquefied nitrogen in an evaporator 403 is introduced under the control of a mass flow controller MFC2.

[0034] (10) The nitrogen gas used in the hydrogen compressor 301 (nitrogen-powered hydrogen booster) is effectively utilized in the factory 400. Measurements by the gas temperature measuring means T4 and the gas temperature measuring means T5 are not essential, but if they are measured, the accuracy of the feedforward is improved.

[0035] In the hydrogen station 300 of this embodiment, the hydrogen gas to be cooled is previously separated into about 1 / 3 flow rate and about 2 / 3 flow rate, and about 1 / 3 is supercooled to near the liquid nitrogen temperature in the pre-cool heat exchanger 303 and mixed with the remaining 2 / 3 hydrogen gas at room temperature that is not cooled, making it possible to stably and inexpensively produce hydrogen gas at a target cooling temperature. The hydrogen temperature to be cooled can be varied by adjusting the above flow rate ratio.

[0036] [Hydrogen gas cooling system] The hydrogen gas cooling system of this embodiment comprises a hydrogen compressor 301 that compresses hydrogen gas, a pressure accumulator 302 that stores the hydrogen gas compressed by the hydrogen compressor 301, a pre-cool heat exchanger 303 that cools the hydrogen gas supplied from the pressure accumulator 302 by heat exchange, a liquefied nitrogen supply line L5 that supplies liquefied nitrogen to the pre-cool heat exchanger 303, and a heat exchanger outlet temperature measuring means T3 that is arranged downstream of the pre-cool heat exchanger 303 on the liquefied nitrogen supply line L5 and measures the outlet temperature of the pre-cool heat exchanger 303.

[0037] The hydrogen gas cooling system of this embodiment adjusts the flow rate of liquid nitrogen in the liquefied nitrogen supply line L5 based on the value measured by the heat exchanger outlet temperature measuring means T3. The flow rate of liquid nitrogen in the liquid nitrogen supply line L5 is controlled by a mass flow controller MFC1 installed in the nitrogen gas outlet line L7.

[0038] The other configuration is the same as that described for the hydrogen station 300. [Hydrogen gas cooling method] The hydrogen gas cooling method of the present embodiment is a hydrogen gas cooling method using the above-described hydrogen gas cooling system.

[0039] Liquefied nitrogen is supplied to the pre-cool heat exchanger 303 through the liquefied nitrogen supply line L5, and the hydrogen gas supplied from the pressure accumulator 302 is cooled by heat exchange. The nitrogen gas vaporized by heat exchange with the hydrogen gas in the pre-cool heat exchanger 303 is supplied to the nitrogen gas usage location 401.

[0040] It is preferable that the nitrogen gas vaporized by heat exchange with hydrogen gas in the pre-cool heat exchanger 303 is supplied to the hydrogen compressor 301 and used as power for the hydrogen compressor 301 .

[0041] It is preferable that the liquefied nitrogen supply line L5 supplies liquefied nitrogen to the pre-cool heat exchanger from a liquefied nitrogen tank installed inside or outside the hydrogen station.

[0042] [Effects] Most of the nitrogen gas used in factories is transported and stored as liquefied nitrogen, and is heat exchanged with the atmosphere in an evaporator, and is often used as room temperature nitrogen gas without utilizing the cold energy. In conventional hydrogen stations, hydrogen gas filled into fuel cell vehicles is cooled in a pre-cooling device, which uses a mechanical refrigerator as the cold heat source. In contrast, in the hydrogen station 300 of this embodiment, hydrogen gas is cooled with liquefied nitrogen in the pre-cooling heat exchanger 303, thereby realizing reduced power consumption, reduced environmental load, and reduced maintenance costs.

[0043] In addition, in conventional hydrogen stations, electricity from a motor or the like is used as the driving source for the hydrogen compressor. In contrast, in the hydrogen station 300 of this embodiment, nitrogen gas vaporized in a pre-cool heat exchanger 303 or nitrogen gas vaporized in an evaporator 403 from liquefied nitrogen extracted from a liquefied nitrogen storage tank 402 is used as the driving source for the hydrogen compressor 301, making it unnecessary to use a motor and realizing a reduction in power consumption.

[0044] In general, nitrogen gas is transported and stored in liquid form in order to transport and store it in large quantities in factories. However, most factories use room temperature nitrogen gas, not liquid nitrogen. In most cases, the cold energy of the liquid nitrogen is not utilized. In contrast, in the hydrogen station 300 and factory 400 of this embodiment, the nitrogen gas after cooling by liquid nitrogen can be effectively utilized in nearby factories, which, combined with the reduction in electricity, achieves further cost reduction. [Explanation of symbols]

[0045] 300: Hydrogen station 301: Hydrogen compressor 302: Pressure accumulator 303: Precooling heat exchanger 304: Hydrogen gas filling container 400: Factory 401: Nitrogen gas use area 402: Liquid nitrogen storage tank 403: Evaporator L0: Low pressure hydrogen gas line L1: High pressure hydrogen gas line L2: Hydrogen gas line L3: Hydrogen gas supply line L4: Bypass line L5: Liquid nitrogen supply line L6: Liquid nitrogen discharge line L7: Nitrogen gas discharge line L8: Nitrogen gas supply line L9, L10: Nitrogen gas line L11: Hydrogen filling line FCV: Fuel cell vehicle FM1: First flow measurement means FM2: Second flow measurement means JCT1: Starting point of the bypass line JCT2: End of the bypass line MFC1, MFC2: Mass flow controller P1, P2: Pressure measurement means T1, T2, T4, T5: Gas temperature measuring means T3: Heat exchanger outlet temperature measurement means V1: First flow rate adjusting means V2: Second flow rate adjusting means

Claims

1. A hydrogen station comprising: a hydrogen compressor that compresses hydrogen gas; a pressure accumulator that stores the hydrogen gas compressed by the hydrogen compressor; a pre-cooling heat exchanger that cools the hydrogen gas supplied from the pressure accumulator by heat exchange; and a liquefied nitrogen supply line that supplies liquefied nitrogen to the pre-cooling heat exchanger, a hydrogen station that supplies liquefied nitrogen to the pre-cool heat exchanger through the liquefied nitrogen supply line, cools the hydrogen gas supplied from the pressure accumulator by heat exchange, and supplies the nitrogen gas vaporized by heat exchange with the hydrogen gas in the pre-cool heat exchanger to a nitrogen gas usage location, The hydrogen station includes a hydrogen gas filling container, a hydrogen gas supply line that supplies hydrogen gas to the hydrogen gas filling container, and a bypass line that bypasses the hydrogen gas supply line; In the pre-cooling heat exchanger, heat is exchanged between the hydrogen gas in the bypass line and the liquefied nitrogen in the liquefied nitrogen supply line; the hydrogen station further comprises a pressure measuring means disposed between the bypass end point of the bypass line and the hydrogen gas filled container, a first flow rate adjusting means disposed on the bypass line, and a second flow rate adjusting means disposed on the hydrogen gas supply line between the bypass start point and the bypass end point of the bypass line, A hydrogen station that controls the first flow rate adjustment means and the second flow rate adjustment means based on the value measured by the pressure measurement means to adjust the flow rate of hydrogen gas in the bypass line and the flow rate of gas in the hydrogen gas supply line.

2. 2. The hydrogen station according to claim 1, further comprising a nitrogen gas outlet line for supplying the nitrogen gas vaporized by heat exchange in the pre-cool heat exchanger to the hydrogen compressor.

3. Further, a nitrogen gas supply line is provided for drawing out liquefied nitrogen from the liquefied nitrogen storage tank and supplying the nitrogen gas vaporized by the evaporator to the hydrogen compressor. The evaporator is installed inside or outside the hydrogen station, The liquefied nitrogen tank is installed inside or outside the hydrogen station. The hydrogen station according to claim 1 or 2.

4. Further, a gas temperature measuring means is provided between the bypass end point of the bypass line and the hydrogen gas filling vessel, 4. A hydrogen station according to claim 1, wherein the first flow rate adjustment means and the second flow rate adjustment means are controlled based on the value measured by the gas temperature measurement means to adjust the flow rate of hydrogen gas in the bypass line and the flow rate of hydrogen gas in the hydrogen gas supply line.

5. A hydrogen station comprising: a hydrogen compressor that compresses hydrogen gas; a pressure accumulator that stores the hydrogen gas compressed by the hydrogen compressor; a pre-cool heat exchanger that cools the hydrogen gas supplied from the pressure accumulator by heat exchange; and a liquefied nitrogen supply line that supplies liquefied nitrogen to the pre-cool heat exchanger, a hydrogen station that supplies liquefied nitrogen to the pre-cool heat exchanger through the liquefied nitrogen supply line, cools the hydrogen gas supplied from the pressure accumulator by heat exchange, and supplies the nitrogen gas vaporized by heat exchange with the hydrogen gas in the pre-cool heat exchanger to a nitrogen gas usage location, The hydrogen station includes a hydrogen gas filling container, a hydrogen gas supply line that supplies hydrogen gas to the hydrogen gas filling container, and a bypass line that bypasses the hydrogen gas supply line; In the pre-cooling heat exchanger, heat is exchanged between the hydrogen gas in the bypass line and the liquefied nitrogen in the liquefied nitrogen supply line; The hydrogen station further includes a first flow rate measuring means disposed on the bypass line, A hydrogen station which supplies liquefied nitrogen based on the value measured by the first flow rate measuring means.

6. A hydrogen station as described in claim 5, further comprising a nitrogen gas outlet line for supplying the nitrogen gas vaporized by heat exchange in the pre-cool heat exchanger to the hydrogen compressor.

7. Further, a nitrogen gas supply line is provided for drawing out liquefied nitrogen from a liquefied nitrogen storage tank and supplying the nitrogen gas vaporized by an evaporator to the hydrogen compressor, The evaporator is installed inside or outside the hydrogen station, The liquefied nitrogen tank is installed inside or outside the hydrogen station. The hydrogen station according to claim 5 or 6.

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