Hydrogen and Oxygen Supply System

Abstract

To provide a hydrogen and oxygen supply system that can effectively use oxygen gas generated as a by-product by a water electrolysis hydrogen generation device.SOLUTION: A hydrogen and oxygen supply system 1 supplies hydrogen gas and oxygen gas generated by electrolyzing water, and comprises a water electrolysis device 2 for generating the hydrogen gas and the oxygen gas by electrolyzing the water, a hydrogen gas discharge path L1 for discharging the hydrogen gas from the water electrolysis device 2, an oxygen gas discharge path L2 for discharging the oxygen gas from the water electrolysis device 2, and a cooling device 3 located in the oxygen gas discharge path L2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hydrogen and oxygen supply system. [Background technology]

[0002] In recent years, technological developments have been made to use hydrogen as an energy source, such as in fuel cell vehicles and household fuel cells. In this context, water electrolysis hydrogen generation devices (hereinafter simply referred to as "water electrolysis devices") are mainly used to produce and use hydrogen from renewable energy sources such as wind power and solar cells that do not rely on fossil fuels (see Patent Document 1).

[0003] In water electrolysis hydrogen generation devices, oxygen gas is produced when water is electrolyzed to produce hydrogen. However, as renewable energy-related facilities become more widely used, economic efficiency has become an issue, and there is a demand for effective use of the by-product oxygen.

[0004] However, there are many cases where there is little demand for oxygen gas near water electrolysis hydrogen generators, and the oxygen gas by-produced by conventional water electrolysis hydrogen generators is released into the atmosphere without being effectively used.In addition, there is also the issue that the oxygen gas generated by water electrolysis hydrogen generators is difficult to store (preserve) because it is not pressurized.

[0005] Patent Document 2 discloses an example in which hydrogen and oxygen are generated by a water electrolysis hydrogen generation device, and the oxygen produced as a by-product is compressed and filled into a cylinder, for effective use as oxygen for inhalation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2005-330514 A [Patent Document 2] JP 2020-047417 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in addition to the method disclosed in Patent Document 2, effective utilization of the by-produced oxygen gas is desired.

[0008] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a hydrogen and oxygen supply system that enables effective use of oxygen gas that is by-produced by a water electrolysis hydrogen generation apparatus. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention employs the following configuration. [1] A hydrogen and oxygen supply system that supplies hydrogen gas and oxygen gas generated by electrolyzing water, A water electrolysis device that electrolyzes water to generate hydrogen gas and oxygen gas; a hydrogen gas outlet path through which the hydrogen gas is discharged from the water electrolysis apparatus; an oxygen gas discharge path through which the oxygen gas is discharged from the water electrolysis apparatus; a cooling device located in the oxygen gas outlet path. [2] The cooling device, A cooling tank located in the oxygen gas outlet path; a cooling head located inside the cooling tank and cooling the oxygen gas; The hydrogen and oxygen supply system described in [1], further comprising a refrigerator that supplies cold heat to the cooling head. [3] A liquefied hydrogen storage tank; A liquefied hydrogen supply path for supplying liquefied hydrogen from the liquefied hydrogen storage tank, The cooling device comprises: The hydrogen and oxygen supply system according to [1], wherein the heat exchanger is located between the oxygen gas discharge path and the liquefied hydrogen supply path. [4] A first temperature measuring means is located on the secondary side of the heat exchanger in the oxygen gas discharge path and measures the temperature of the liquefied oxygen. a first flow rate adjusting means that is located on the primary side of the heat exchanger in the oxygen gas discharge path and adjusts the flow rate of the oxygen gas; and a first control means for adjusting the flow rate of the oxygen gas in accordance with the temperature of the liquefied oxygen. [5] A second temperature measuring means is located on the secondary side of the heat exchanger of the liquefied hydrogen supply path and measures the temperature of the hydrogen gas. A second flow rate adjusting means is located on the secondary side of the second temperature measuring means in the liquefied hydrogen supply path and adjusts the flow rate of hydrogen gas; and a second control means for adjusting the flow rate of the hydrogen gas in accordance with the temperature of the hydrogen gas. [6] The hydrogen and oxygen supply system described in [5], wherein the liquefied hydrogen supply path merges with the hydrogen gas discharge path on the secondary side of the second flow rate control means. [7] A hydrogen and oxygen supply system according to any one of [1] to [6], further comprising a liquefied oxygen storage tank. [8] A hydrogen and oxygen supply system as described in [7], which supplies oxygen gas on-site from the liquefied oxygen storage tank to an oxygen gas utilization facility. Effect of the Invention

[0010] The hydrogen and oxygen supply system of the present invention makes it possible to effectively utilize the oxygen gas by-produced by the water electrolysis hydrogen generation device. [Brief description of the drawings]

[0011] [Figure 1] 1 is a system diagram showing a hydrogen and oxygen supply system according to a first embodiment of the present invention; [Diagram 2] FIG. 4 is a system diagram showing a hydrogen and oxygen supply system according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a hydrogen and oxygen supply system according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the drawings used in the following description may show characteristic parts in an enlarged scale for the sake of convenience in order to make the characteristics easier to understand, and the dimensional ratios of each component may not necessarily be the same as in reality.

[0013] First Embodiment First, the configuration of a hydrogen and oxygen supply system according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a system diagram showing a hydrogen and oxygen supply system 1 according to a first embodiment of the present invention. As shown in FIG. 1, the hydrogen and oxygen supply system 1 of the present embodiment is generally configured to include a water electrolysis device 2, a hydrogen gas discharge path L1, an oxygen gas discharge path L2, a cooling device 3, and a liquefied oxygen storage tank 4.

[0014] The water electrolysis device (water electrolysis hydrogen generation device) 2 is a device that electrolyzes water to generate hydrogen gas and oxygen gas. Known devices and facilities can be used as the water electrolysis device 2. Furthermore, it is preferable to use renewable energy such as wind power or solar cells for water electrolysis using the water electrolysis device 2, which does not rely on fossil fuels.

[0015] The hydrogen gas discharge path L1 is located between the hydrogen electrolysis device 2 and a hydrogen gas utilization facility or equipment (not shown) (hereinafter simply referred to as a "hydrogen gas utilization facility"), and is a path for supplying hydrogen gas discharged from the water electrolysis device 2 to the hydrogen gas utilization facility. As the hydrogen gas discharge path L1, piping made of a material with low hydrogen permeability and excellent pressure resistance can be used.

[0016] The oxygen gas discharge path L2 includes a path L2A, a path L2B, and a path L2C. Specifically, the oxygen gas discharge path L2 branches into a path L2A and a path L2B at a branch point P. Furthermore, the path L2A branches into a path L2C at a branch point Q. As the oxygen gas discharge path L2, a pipe made of a material having low oxygen permeability and excellent pressure resistance can be used.

[0017] A buffer tank 5 and a compressor 6 are located in the oxygen gas discharge path L2. Providing the buffer tank 5 and the compressor 6 in the oxygen gas discharge path L2 enables a stable supply of oxygen gas to path L2A or path L2B subsequent to branch point P (secondary side). Note that if the supply amount of oxygen gas generated by the hydrogen electrolysis device 2 is sufficient, the buffer tank 5 and the compressor 6 may be omitted.

[0018] The path L2A is a path for supplying the oxygen gas derived from the water electrolysis apparatus 2 to an oxygen gas utilization facility or utilization equipment (hereinafter simply referred to as an "oxygen gas utilization facility"). An on-off valve V1, a pressure gauge 7, and an on-off valve V3 are positioned on the path L2A.

[0019] The path L2B is located between the branch point P of the oxygen gas discharge path L2 and the cooling device 3, and is a path for supplying the oxygen gas discharged from the hydrogen electrolysis device 2 to the cooling device 3. Specifically, one end of the path L2B communicates with the oxygen gas discharge path L2 and the path L2A at the branch point P, and the other end opens to the inside of the cooling tank 8 described below. An on-off valve V2 is located on the path L2B.

[0020] Path L2C is located between branch point Q of path L2A and the cooling device 3, and is a path for supplying the oxygen gas flowing through path L2A to the cooling device 3. Specifically, one end of path L2C communicates with path L2A at branch point Q, and the other end opens to the inside of cooling tank 8, which will be described later.

[0021] The cooling device 3 is located in the oxygen gas discharge path L2 and is an oxygen liquefier that cools the oxygen gas in the oxygen gas discharge path L2 to generate liquefied oxygen. Specifically, the cooling device 3 has a cooling tank 8, a cooling head 9, and a refrigerator 10.

[0022] The cooling tank 8 is located in the oxygen gas discharge path L2, and is a container for cooling the oxygen gas flowing through the oxygen gas discharge path L2 to generate liquefied oxygen and temporarily storing the liquefied oxygen. Specifically, the cooling tank 8 is in communication with each of the paths L2B and L2C constituting the oxygen gas discharge path L2.

[0023] The cooling tank 8 preferably has a heat insulating structure, and more preferably has a vacuum heat insulating structure, so as to reduce the influence of heat from the outside when cooling the oxygen gas.

[0024] The liquefied oxygen produced by cooling is temporarily stored inside the cooling tank 8. The amount of liquefied oxygen stored in the cooling tank 8 may be managed and controlled by a weight scale or a liquid level gauge (not shown).

[0025] The cooling head 9 is located inside the cooling tank 8 and cools the oxygen gas. Specifically, the cooling head 9 is located above the space inside the cooling tank 8 and cools and liquefies the oxygen gas in the paths L2B and L2C located inside the cooling tank 8. The generated liquefied oxygen is led out from the ends of the paths L2B and L2C into the inside of the cooling tank 8 and stored in the bottom of the cooling tank 8.

[0026] The refrigerator 10 is a device located outside the cooling tank 8, and supplies cold heat to the cooling head 9. The refrigerator 10 is not particularly limited as long as it can cool to a temperature below the liquefaction temperature of oxygen. A known GM refrigerator or helium refrigerator can be used as the refrigerator 10.

[0027] The liquefied oxygen outlet path L3 is located between the cooling device 3 and the liquefied oxygen storage tank 4, and is a path for transferring liquefied oxygen from the cooling device 3 to the liquefied oxygen storage tank 4. Specifically, one end of the liquefied oxygen outlet path L3 is open to the inside of the cooling tank 8 (liquid phase when liquefied oxygen is stored), and the other end is connected to the liquefied oxygen storage tank 4. An on-off valve V4 is located in the liquefied oxygen storage tank 4.

[0028] The liquefied oxygen storage tank 4 is a container for storing liquefied oxygen. The liquefied oxygen storage tank 4 is preferably one having a heat insulating structure, and more preferably a vacuum heat insulating structure, in order to make it less susceptible to the effects of heat from the outside. Furthermore, as the liquefied oxygen storage tank 4, a cold evaporator (CE) may be used if the hydrogen and oxygen supply system 1 is near an oxygen gas utilization facility, or an existing (industrial gas) portable container may be used if the oxygen gas utilization facility is in a remote location. The portable container storing the liquefied oxygen can be transported using existing logistics.

[0029] The hydrogen and oxygen supply system 1 of this embodiment supplies hydrogen gas and oxygen gas generated by electrolyzing water to a required hydrogen gas utilization facility and oxygen gas utilization facility.

[0030] The hydrogen and oxygen supply system 1 of this embodiment is preferably installed in the vicinity of a hydrogen gas utilization facility. By installing the hydrogen and oxygen supply system 1 of this embodiment in the hydrogen gas utilization facility, the hydrogen required for the hydrogen gas utilization facility can be supplied on-site.

[0031] Examples of hydrogen gas utilization facilities include, but are not limited to, hydrogen stations that supply the necessary hydrogen to fuel cells for industrial forklifts, large fuel cell vehicles such as trucks and buses, and rail fuel cell vehicles that replace diesel vehicles that run on tracks without overhead lines.

[0032] The hydrogen and oxygen supply system 1 of this embodiment is preferably installed close to an oxygen gas utilization facility. By installing the hydrogen and oxygen supply system 1 of this embodiment next to an oxygen gas utilization facility, oxygen required for the oxygen gas utilization facility can be supplied on-site from the liquefied oxygen storage tank 4 to the oxygen gas utilization facility. Furthermore, when the hydrogen and oxygen supply system 1 of this embodiment is provided with a portable container as the liquefied oxygen storage tank 4, the oxygen gas utilization facility may be located in a remote location.

[0033] The oxygen gas utilization facility is not particularly limited as long as it can effectively consume oxygen. Examples of the oxygen gas utilization facility include a closed circulation type land-based aquaculture facility and a culture factory for culturing aerobic bacteria.

[0034] Next, a method of operating the hydrogen and oxygen supply system 1 of this embodiment will be described with reference to FIG. First, the hydrogen and oxygen supply system 1 of this embodiment electrolyzes water using the water electrolysis device 2 to generate hydrogen gas and oxygen gas. The hydrogen gas generated here is supplied to a hydrogen gas utilization facility (not shown) via a hydrogen gas outlet path L1.

[0035] On the other hand, the generated oxygen gas is pressure-transmitted by the compressor 6 to the oxygen gas discharge path L2 and discharged. When oxygen gas is consumed in an oxygen gas utilization facility (not shown), the on-off valves V1 and V3 of the path L2A are opened and the on-off valve V2 of the path L2B is closed. This allows oxygen gas to be supplied to the oxygen gas utilization facility (not shown) via the path L2A.

[0036] When the use (consumption) of oxygen gas is stopped in the oxygen gas utilization facility, first, the on-off valve V3 of the path L2A is closed. As a result, the oxygen gas is introduced into the cooling tank 8 via the path L2C. Inside the cooling tank 8, the oxygen gas in the path L2C is heat exchanged (cooled) with the cold heat of the refrigerator 10 via the cooling head 9. The generated liquefied oxygen is stored at the bottom of the cooling tank 8.

[0037] Next, the on-off valve V1 of the path L2A is closed, and the on-off valve V2 of the path L2B is opened. As a result, the oxygen gas is introduced into the cooling tank 8 via the path L2B. Inside the cooling tank 8, the oxygen gas in the path L2B is heat exchanged (cooled) with the cold heat of the refrigerator 10 via the cooling head 9. The generated liquefied oxygen is stored at the bottom of the cooling tank 8.

[0038] The liquefied oxygen stored at the bottom of the cooling tank 8 can be managed by weight or liquid level. When the liquid volume or liquid level exceeds a required threshold, the liquefied oxygen is transferred from the cooling tank 8 to the liquefied oxygen storage tank 4 via the liquefied oxygen outlet path L3. Furthermore, when a portable container is used as the liquefied oxygen storage tank 4, it can be transported from the hydrogen and oxygen supply system 1 of this embodiment to a remote oxygen gas utilization facility for use.

[0039] The hydrogen and oxygen supply system 1 of this embodiment can supply oxygen gas on-site when there is demand at an oxygen gas utilization facility, and can generate and store liquefied oxygen for storage when there is no demand at the oxygen gas utilization facility.

[0040] As described above, according to the hydrogen and oxygen supply system 1 of this embodiment, the oxygen gas by-produced by the water electrolysis apparatus (water electrolysis hydrogen generation apparatus) 2 can be effectively utilized.

[0041] Moreover, according to the hydrogen and oxygen supply system 1 of the present embodiment, the oxygen gas by-produced by the water electrolysis device 2 is stored as liquefied oxygen rather than as compressed gas, resulting in a simple device configuration and easy maintenance. Furthermore, the system can be made compact, resulting in space savings.

[0042] Furthermore, according to the hydrogen and oxygen supply system 1 of the present embodiment, when the oxygen gas by-produced by the water electrolysis apparatus 2 is stored as liquefied oxygen, the moisture in the oxygen is separated and removed during liquefaction, eliminating the need for a moisture removal facility.

[0043] Furthermore, according to the hydrogen and oxygen supply system 1 of this embodiment, when an oxygen gas utilization facility is installed, a backup is possible using the liquefied oxygen storage tank 4 that stores liquefied oxygen, enabling the effective use of oxygen that was previously discarded. For example, when oxygen is used in land-based aquaculture facilities, storing the oxygen as liquefied oxygen in the liquefied oxygen storage tank 4 makes it possible to reliably supply oxygen even during a power outage.

[0044] <Second embodiment> Next, the configuration of a hydrogen and oxygen supply system according to a second embodiment of the present invention will be described. Fig. 2 is a system diagram showing a hydrogen and oxygen supply system 21 according to a second embodiment of the present invention. In this embodiment, the configuration of the cooling device is different from that of the hydrogen and oxygen supply system 1 according to the first embodiment. Therefore, the hydrogen and oxygen supply system according to this embodiment will be described with reference to Fig. 2. Note that in the hydrogen and oxygen supply system according to this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and will not be described.

[0045] As shown in FIG. 2, the hydrogen and oxygen supply system 21 of this embodiment is generally configured to include a water electrolysis apparatus 2, a hydrogen gas derivation path L21, an oxygen gas derivation path L22, a heat exchanger (cooling device) 23, a liquefied oxygen storage tank 4, a liquefied hydrogen storage tank 25, and a liquefied hydrogen supply path L24.

[0046] The hydrogen gas discharge path L21 is located between the hydrogen electrolysis device 2 and a hydrogen gas utilization facility (not shown), and is a path for supplying hydrogen gas discharged from the water electrolysis device 2 to the hydrogen gas utilization facility. The hydrogen gas discharge path L21 merges with the liquefied hydrogen supply path L24 at a junction R, and merges with the hydrogen gas supply path L25 at a junction S. The hydrogen gas discharge path L21 can be made of piping made of a material with low hydrogen permeability and excellent pressure resistance.

[0047] The hydrogen gas discharge path L21 is provided with a buffer tank 26 and a compressor 27. Providing the buffer tank 26 and the compressor 27 in the hydrogen gas discharge path L21 enables a stable supply of hydrogen gas to a hydrogen gas utilization facility (not shown). If the supply amount and supply pressure of the hydrogen gas generated by the hydrogen electrolysis device 2 are sufficient, the buffer tank 26 and the compressor 27 may be omitted.

[0048] The oxygen gas discharge path L22 is located between the hydrogen electrolysis device 2 and the liquefied oxygen storage tank 4, and is a path for liquefying the oxygen gas discharged from the hydrogen electrolysis device 2 and supplying the liquefied oxygen storage tank 4. The oxygen gas discharge path L22 can be made of a piping made of a material with low oxygen permeability and excellent pressure resistance.

[0049] The oxygen gas discharge path L22 is positioned with a buffer tank 28, a flow regulator (first flow regulator) 29, a heat exchanger 23, and a thermometer (first temperature measurer) 30. Providing the buffer tank 28 in the oxygen gas discharge path L22 ensures a stable supply of oxygen gas. If the supply amount of oxygen gas generated by the hydrogen electrolysis device 2 is sufficient, the buffer tank 28 can be omitted.

[0050] The flow rate regulator 29 is located on the primary side of the heat exchanger 23 in the oxygen gas derivation path L22, and regulates (controls) the flow rate of oxygen gas supplied to the heat exchanger 23. The flow rate regulator 29 is electrically connected by wire or wirelessly to a control device (first control means) 33, which will be described later, and is capable of receiving a control signal from the control device 33 to regulate the flow rate of oxygen gas.

[0051] The thermometer 30 is located on the secondary side of the heat exchanger 23 in the oxygen gas derivation path L22, and measures the temperature of the liquefied oxygen in the oxygen gas derivation path L22 immediately after passing through the heat exchanger 23. The thermometer 30 is electrically connected to the control device 33 (described later) by wire or wirelessly, and is capable of transmitting the measured value of the liquefied oxygen temperature to the control device 33 as an electrical signal.

[0052] The liquefied hydrogen storage tank 25 is a container for storing liquefied hydrogen. The liquefied hydrogen storage tank 25 is preferably one having a heat insulating structure, more preferably a vacuum heat insulating structure, so as to be less susceptible to the effects of heat from the outside. The liquefied hydrogen storage tank 25 is connected to a liquefied hydrogen supply line L24 and a hydrogen gas supply line L25.

[0053] The liquefied hydrogen supply path L24 is located between the liquefied hydrogen storage tank 25 and the junction R of the hydrogen gas discharge path L21, and discharges the liquefied hydrogen in the liquefied hydrogen storage tank 25. Specifically, one end of the liquefied hydrogen supply path L24 communicates with the liquid phase of the liquefied hydrogen storage tank 25, and the other end communicates with the hydrogen gas discharge path L21 at the junction R. In other words, the liquefied hydrogen supply path L24 merges with the hydrogen gas discharge path L21 on the secondary side of a flow regulator (second flow rate adjustment means) 32 described later.

[0054] A heat exchanger 23, a thermometer (second temperature measuring means) 31, and a flow regulator (second flow regulator) 32 are positioned in the liquefied hydrogen supply path L24.

[0055] The thermometer 31 is located on the secondary side of the heat exchanger 23 in the liquefied hydrogen supply path L24, and measures the temperature of the hydrogen gas in the liquefied hydrogen supply path L24 immediately after it has passed through the heat exchanger 23. The thermometer 31 is electrically connected to a control device (second control means) 33 (described later) by wire or wirelessly, and is capable of transmitting the measured value of the hydrogen gas temperature to the control device 33 as an electrical signal.

[0056] The flow rate regulator 32 is located on the secondary side of the thermometer 31 in the liquefied hydrogen supply path L24, and adjusts (controls) the flow rate of the liquefied hydrogen supplied to the heat exchanger 23. The flow rate regulator 32 is electrically connected to a control device 33 (described later) by wire or wirelessly, and is capable of receiving a control signal from the control device 33 to adjust the flow rate of the liquefied hydrogen.

[0057] The hydrogen gas supply path L25 is located between the liquefied hydrogen storage tank 25 and the junction S of the hydrogen gas discharge path L21, and supplies hydrogen gas in the liquefied hydrogen storage tank 25 to the hydrogen gas discharge path L21. Specifically, one end of the hydrogen gas supply path L25 communicates with the gas phase of the liquefied hydrogen storage tank 25, and the other end communicates with the hydrogen gas discharge path L21 at the junction S. In other words, the hydrogen gas supply path L25 merges with the hydrogen gas discharge path L21.

[0058] The heat exchanger (cooling device) 23 is provided between the oxygen gas derivation path L22 and the liquefied hydrogen supply path L24. The heat exchanger 23 exchanges heat using the oxygen gas in the oxygen gas derivation path L22 as a hot heat source and the liquefied hydrogen in the liquefied hydrogen supply path L24 as a cold heat source. The oxygen gas in the oxygen gas derivation path L22 is cooled and liquefied in the heat exchanger 23. The liquefied hydrogen in the liquefied hydrogen supply path L24 is heated and vaporized in the heat exchanger 23.

[0059] The control device (first control means, second control means) 33 is electrically connected to the flow regulator 29, the thermometer 30, the thermometer 31, and the flow regulator 32, respectively, by wire or wirelessly, and receives the measured value as an electric signal and transmits a control signal. In this way, the control device 33 can adjust (control) the flow rate (supply amount) of oxygen gas in the oxygen gas derivation path L22 according to the temperature of the liquefied oxygen after passing through the heat exchanger 23 in the oxygen gas derivation path L22. Also, the control device 33 can adjust (control) the flow rate (supply amount) of liquefied hydrogen in the liquefied hydrogen supply path L24 according to the temperature of the hydrogen gas after passing through the heat exchanger 23 in the liquefied hydrogen supply path L24.

[0060] The control device 33 is not particularly limited, but may be a controller such as a sequencer that controls the equipment.

[0061] Next, a method of operating the hydrogen and oxygen supply system 21 of this embodiment will be described with reference to FIG. First, the hydrogen and oxygen supply system 21 of this embodiment electrolyzes water using the water electrolysis device 2 to generate hydrogen gas and oxygen gas. The hydrogen gas generated here is supplied to a hydrogen gas utilization facility (not shown) via a hydrogen gas outlet path L21.

[0062] The generated oxygen gas is discharged to oxygen gas discharge path L2. In oxygen gas discharge path L22, the outlet temperature of heat exchanger 23 is measured by thermometer 30, and oxygen gas is introduced into heat exchanger 23 while controlling the flow rate by flow regulator 29. This causes the oxygen gas to be cooled and stored in liquefied oxygen storage tank 4 as liquefied oxygen.

[0063] On the other hand, the liquefied hydrogen used to cool the oxygen gas is introduced into the heat exchanger 23 in the liquefied hydrogen supply line L24 while the outlet temperature of the heat exchanger 23 is measured by a thermometer 31 and the flow rate is controlled by a flow rate regulator 32. According to the hydrogen and oxygen supply system 21 of this embodiment, the flow rates are controlled while measuring the temperatures of oxygen and hydrogen at the outlet of the heat exchanger 23, so that liquefied oxygen can be reliably produced by heat exchange using the required amount of liquefied hydrogen.

[0064] As described above, the hydrogen and oxygen supply system 21 of this embodiment can achieve the same effects as the hydrogen and oxygen supply system 1 of the above-described first embodiment.

[0065] Furthermore, according to the hydrogen and oxygen supply system 21 of this embodiment, the oxygen gas is cooled by heat exchange between the liquefied hydrogen and the oxygen gas to produce liquefied oxygen, and the hydrogen gas obtained by vaporizing the liquefied hydrogen can be effectively utilized in the hydrogen gas utilization facility.

[0066] Although the embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and designs within the scope of the gist of the present invention are also included. For example, in the above-mentioned hydrogen and oxygen supply systems 1, 21, a configuration including a liquefied oxygen storage tank 4 has been described as an example, but the present invention is not limited to this. In the case where an oxygen gas utilization facility that uses oxygen gas or liquefied oxygen is adjacent, the hydrogen and oxygen supply system of the present invention may be configured to omit the liquefied oxygen storage tank 4. This makes it possible to reduce the size of the system and transportation costs.

[0067] In the above-mentioned hydrogen and oxygen supply system 1, 21, a configuration in which a common controller 33 is used to control the flow rates of the oxygen gas derivation line L22 and the liquefied hydrogen supply line L24 has been described as an example, but a configuration in which a separate controller is provided for each may be used. Alternatively, if the thermometer or flow rate regulator has a control mechanism, that may be used and the controller may be omitted. [Explanation of symbols]

[0068] 1,21 Hydrogen and oxygen supply systems 2 Water electrolysis device 3 Cooling device 4. Liquid oxygen storage tank 8 Cooling tank 9 Cooling Head 10. Refrigeration Machine 23 Heat exchanger (cooling device) 25 Liquefied hydrogen storage tank 29 Flow rate regulator (first flow rate adjustment means) 30 Thermometer (first temperature measurement means) 31 Thermometer (second temperature measurement means) 32 Flow rate regulator (second flow rate adjustment means) 33 Control device (first control means, second control means) L1 Hydrogen gas extraction route L2 Oxygen gas extraction route L2A Route L2B Route L2C Route L21 Hydrogen gas extraction route L22 Oxygen gas extraction route L24 Liquid hydrogen supply route

Claims

1. A hydrogen and oxygen supply system that supplies hydrogen gas and oxygen gas generated by electrolyzing water, A water electrolysis device that electrolyzes water to generate hydrogen gas and oxygen gas; a hydrogen gas outlet path through which the hydrogen gas is discharged from the water electrolysis apparatus; an oxygen gas discharge path through which the oxygen gas is discharged from the water electrolysis apparatus; a cooling device located in the oxygen gas outlet path, The hydrogen and oxygen supply system includes a liquefied hydrogen storage tank and A liquefied hydrogen supply path for supplying liquefied hydrogen from the liquefied hydrogen storage tank, The cooling device comprises: a heat exchanger located between the oxygen gas outlet path and the liquefied hydrogen supply path, The hydrogen and oxygen supply system includes a first temperature measuring means located on the secondary side of the heat exchanger in the oxygen gas outlet path, the first temperature measuring means measuring a temperature of the liquefied oxygen; a first flow rate adjusting means for adjusting a flow rate of the oxygen gas, the first flow rate adjusting means being located on the primary side of the heat exchanger in the oxygen gas discharge path; A hydrogen and oxygen supply system comprising: a first control means for adjusting the flow rate of the oxygen gas in accordance with the temperature of the liquefied oxygen.

2. A second temperature measuring means is located on the secondary side of the heat exchanger of the liquefied hydrogen supply path and measures the temperature of the hydrogen gas; A second flow rate adjusting means is located on the secondary side of the second temperature measuring means in the liquefied hydrogen supply path and adjusts the flow rate of hydrogen gas; 2. The hydrogen and oxygen supply system according to claim 1, further comprising: a second control means for adjusting the flow rate of the hydrogen gas in accordance with the temperature of the hydrogen gas.

3. A hydrogen and oxygen supply system that supplies hydrogen gas and oxygen gas generated by electrolyzing water, comprising: A water electrolysis device that electrolyzes water to generate hydrogen gas and oxygen gas; a hydrogen gas outlet path through which the hydrogen gas is discharged from the water electrolysis apparatus; an oxygen gas discharge path through which the oxygen gas is discharged from the water electrolysis apparatus; a cooling device located in the oxygen gas outlet path, The hydrogen and oxygen supply system includes a liquefied hydrogen storage tank and A liquefied hydrogen supply path for supplying liquefied hydrogen from the liquefied hydrogen storage tank, The cooling device comprises: a heat exchanger located between the oxygen gas outlet path and the liquefied hydrogen supply path, The hydrogen and oxygen supply system includes a second temperature measuring means located on the secondary side of the heat exchanger in the liquefied hydrogen supply path and measuring a temperature of the hydrogen gas; A second flow rate adjusting means is located on the secondary side of the second temperature measuring means in the liquefied hydrogen supply path and adjusts the flow rate of hydrogen gas; and a second control means for adjusting the flow rate of the hydrogen gas in accordance with the temperature of the hydrogen gas.

4. 4. The hydrogen and oxygen supply system according to claim 2, wherein the liquefied hydrogen supply path merges with the hydrogen gas discharge path on the secondary side of the second flow rate adjustment means.

5. The hydrogen and oxygen supply system according to any one of claims 1 to 4, further comprising a liquefied oxygen storage tank.

6. 6. The hydrogen and oxygen supply system according to claim 5, wherein oxygen gas is supplied on-site from the liquefied oxygen storage tank to an oxygen gas utilization facility.

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