Steam supply system and hydrogen supply method

Abstract

Reduce CO2 emissions. [Solution] The steam supply system 10 includes a hydrogen boiler 20, a first hydrogen supply facility 31 that supplies a first hydrogen H1, a first pressure reducing valve 55 that adjusts a flow rate F1 of the first hydrogen H1, a second hydrogen supply facility 32 that supplies a second hydrogen H2, and a second pressure reducing valve 65 that adjusts a flow rate F2 of the second hydrogen H2, and a CO2 emission coefficient C1 of the first hydrogen H1 is smaller than a CO2 emission coefficient C2 of the second hydrogen H2, and a required amount F of hydrogen H of the hydrogen boiler 20 is smaller than a CO2 emission coefficient C2 of the second hydrogen H2. When t is less than the maximum supply amount of the first hydrogen H1, the first pressure reducing valve 55 adjusts the flow rate F1 of the first hydrogen H1 in accordance with the demand amount Ft, and the second pressure reducing valve 65 adjusts the flow rate F2 of the second hydrogen H2 to 0; when the demand amount Ft exceeds the maximum supply amount, the first pressure reducing valve 55 adjusts the flow rate F1 of the first hydrogen H1 to the maximum supply amount, and the second pressure reducing valve 65 adjusts the flow rate F2 of the second hydrogen H2 in accordance with the shortfall of the first hydrogen H1 relative to the demand amount Ft.

Description

[Technical field]

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

[0002] In recent years, there has been an increasing social demand for setting targets and disclosing information on supply chain emissions, including not only direct greenhouse gas (e.g., CO2) emissions by businesses themselves (Scope 1) and indirect greenhouse gas emissions associated with the use of electricity, heat, etc. supplied by other businesses (Scope 2), but also indirect greenhouse gas emissions by other businesses related to the activities of businesses (Scope 3). Supply chain emissions are the total of Scope 1 CO2 emissions, Scope 2 CO2 emissions, and Scope 3 CO2 emissions. Patent Document 1 discloses technology for reducing the amount of CO2 emissions when steam generated by a hydrogen boiler is used as a heating and pressurizing source in processes that require heat, such as the vulcanization process in the tire manufacturing process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2024-032370 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a steam supply system and a hydrogen supply method that make it possible to reduce CO2 emissions. [Means for solving the problem]

[0005] The steam supply system according to the present invention includes a hydrogen boiler that generates steam using hydrogen as fuel, a hydrogen supply pipe connected to the hydrogen boiler, a first hydrogen supply facility that supplies a first hydrogen among the hydrogen supplied to the hydrogen boiler, a first pipe connecting the first hydrogen supply facility and the hydrogen supply pipe, and a first flow rate adjustment unit that adjusts the flow rate of the first hydrogen passing through the first pipe, and further includes a second hydrogen supply facility that supplies a second hydrogen among the hydrogen supplied to the hydrogen boiler, a second pipe connecting the second hydrogen supply facility and the hydrogen supply pipe, and a second flow rate adjustment unit that adjusts the flow rate of the second hydrogen passing through the second pipe. a CO2 emission coefficient of the first hydrogen is smaller than a CO2 emission coefficient of the second hydrogen, and when the hydrogen demand of the hydrogen boiler is equal to or less than a maximum supply amount of the first hydrogen of the first hydrogen supply facility, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the demanded amount and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0, and when the demanded amount exceeds the maximum supply amount, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen in accordance with the shortfall of the first hydrogen with respect to the demanded amount.

[0006] A hydrogen supply method according to the present invention is a method for supplying hydrogen to an apparatus that uses hydrogen, the hydrogen including a first hydrogen and a second hydrogen, a CO2 emission coefficient of the first hydrogen being smaller than a CO2 emission coefficient of the second hydrogen, a first hydrogen supply facility that supplies the first hydrogen is connected to a hydrogen supply piping connected to the apparatus via a first piping, one or more second hydrogen supply facilities that supply the second hydrogen are each connected via a second piping, a first flow rate adjustment unit that adjusts a flow rate of the first hydrogen is provided in the first piping, and a second hydrogen supply facility that adjusts a flow rate of the second hydrogen is provided in the first piping. A second flow rate adjustment unit is provided on the second piping, and when the hydrogen demand of the device is equal to or less than the maximum supply amount of the first hydrogen from the first hydrogen supply equipment, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the demand, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0; when the demand exceeds the maximum supply amount, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen in accordance with the shortfall of the first hydrogen relative to the demand. Effect of the Invention

[0007] According to the present invention, it is possible to suppress CO2 emissions. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a steam supply system according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram showing a hydrogen generation facility. [Diagram 3] FIG. 2 is a schematic diagram showing a hydrogen receiving facility. [Figure 4] FIG. 2 is a control block diagram of the steam supply system according to the first embodiment of the present invention. [Diagram 5] FIG. 4 is a diagram showing the relationship between the supply amount of the first hydrogen and the second hydrogen and the demand amount of hydrogen. [Figure 6] FIG. 4 is a schematic diagram showing a modified example of the steam supply system according to the first embodiment of the present invention. [Figure 7] FIG. 4 is a schematic diagram showing a steam supply system according to a second embodiment of the present invention. [Figure 8] FIG. 5 is a control block diagram of a steam supply system according to a second embodiment of the present invention. [Figure 9] FIG. 1 is a diagram showing an example of a carbon footprint for a tire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Foundations underlying the present invention] In recent years, a technology for reducing CO2 emissions has been known in which steam, which is widely used as a heating and pressurizing source in product manufacturing processes, is generated by a hydrogen boiler. Hydrogen is an example of a carbon-free fuel that can reduce CO2 emissions (CO2 emission coefficient) to "0" when burned. The above-mentioned Patent Document 1 discloses a technology for reducing CO2 emissions by using steam generated by a hydrogen boiler as a heating and pressurizing source in processes in the tire manufacturing process that require heat (such as the vulcanization process).

[0010] However, while the conventional technology disclosed in Patent Document 1 suppresses Scope 1 and Scope 2 CO2 emissions, it does not take into consideration the management and suppression of Scope 3 CO2 emissions, and no method has been established for disclosing information on Scope 3 CO2 emissions. Therefore, the inventors of the present application have conducted intensive research into technology that enables the suppression and management of Scope 3 CO2 emissions and facilitates the disclosure of information on Scope 3 CO2 emissions, and have arrived at the present invention.

[0011] [Overview of the embodiment of the present invention] (1) The present invention provides a system including a hydrogen boiler that generates steam using hydrogen as fuel, a hydrogen supply pipe connected to the hydrogen boiler, a first hydrogen supply facility that supplies a first hydrogen among the hydrogen supplied to the hydrogen boiler, a first pipe connecting the first hydrogen supply facility and the hydrogen supply pipe, and a first flow rate adjustment unit that adjusts the flow rate of the first hydrogen passing through the first pipe, and further including one or more second hydrogen supply facilities that supply a second hydrogen among the hydrogen supplied to the hydrogen boiler, a second pipe connecting the second hydrogen supply facility and the hydrogen supply pipe, and a second flow rate adjustment unit that adjusts the flow rate of the second hydrogen passing through the second pipe. a CO2 emission coefficient of the first hydrogen is smaller than a CO2 emission coefficient of the second hydrogen, and when an amount of hydrogen required by the hydrogen boiler is equal to or less than a maximum supply amount of the first hydrogen of the first hydrogen supply facility, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the required amount and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0, and when the required amount exceeds the maximum supply amount, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen in accordance with a shortfall of the first hydrogen with respect to the required amount.

[0012] According to the steam supply system having the above configuration, the first hydrogen having a smaller CO2 emission coefficient can be preferentially used to supply steam. Therefore, the steam supply system can suppress CO2 emissions. This steam supply system can suppress Scope 3 CO2 emissions.

[0013] (2) In the steam supply system, it is preferable that the first flow rate control unit is composed of a first pressure reducing valve, the second flow rate control unit is composed of a second pressure reducing valve, and the set value of the first hydrogen supply pressure downstream of the first pressure reducing valve is larger than the set value of the second hydrogen supply pressure downstream of the second pressure reducing valve. According to the above configuration, Scope 3 CO2 emissions can be reduced by using a simple steam supply system that uses a pressure reducing valve.

[0014] (3) It is preferable that the steam supply system further includes a first flowmeter that measures a flow rate of the first hydrogen flowing through the first piping, a second flowmeter that measures a flow rate of the second hydrogen flowing through the second piping, and a calculation device that calculates an amount of CO2 emissions associated with steam generation by the hydrogen boiler based on the flow rate of the first hydrogen measured by the first flowmeter and the flow rate of the second hydrogen measured by the second flowmeter. According to the steam supply system having the above configuration, it is possible to easily manage Scope 3 CO2 emissions.

[0015] (4) In the steam supply system, it is preferable that the arithmetic device generates product information linking the calculated CO2 emissions with a product manufactured using the steam generated by the hydrogen boiler. According to the steam supply system having the above configuration, a carbon footprint of a product can be created based on the product information generated by the computing device. This makes it easy to disclose information about the product's Scope 3 CO2 emissions.

[0016] (5) It is preferable that the steam supply system has the first CO2 emission coefficient of “0”. According to the steam supply system having the above configuration, it is possible to suppress Scope 3 CO2 emissions.

[0017] (6) In the steam supply system, it is preferable that the first hydrogen supply facility includes a hydrogen generation facility that generates the first hydrogen. The steam supply system configured as above makes it possible to generate hydrogen in a location close to where the hydrogen is consumed, thereby reducing Scope 3 CO2 emissions.

[0018] (7) In the steam supply system, the second hydrogen supply facility preferably includes a hydrogen receiving facility that receives the second hydrogen from an outside source. According to the steam supply system configured as described above, it is possible to realize a stable supply of hydrogen while suppressing Scope 3 CO2 emissions.

[0019] (8) It is preferable that the steam supply system includes a plurality of the first hydrogen supply facilities. According to the steam supply system having the above configuration, the ratio of the first hydrogen to the total hydrogen supplied to the hydrogen boiler can be increased, thereby suppressing Scope 3 CO2 emissions.

[0020] (9) The present invention also provides a method of supplying hydrogen to an apparatus that uses hydrogen, the method including: connecting a first hydrogen supply facility that supplies the first hydrogen via a first pipe to a hydrogen supply piping connected to the apparatus; connecting one or more second hydrogen supply facilities that supply the second hydrogen via second pipes; providing a first flow rate adjustment unit in the first pipe that adjusts a flow rate of the first hydrogen; and providing a second flow rate adjustment unit in the second pipe that adjusts a flow rate of the second hydrogen. a flow rate adjustment unit is provided in the second piping, and when the hydrogen demand of the device is equal to or less than a maximum supply amount of the first hydrogen of the first hydrogen supply equipment, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the demanded amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0, and when the demanded amount exceeds the maximum supply amount, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen in accordance with the shortfall of the first hydrogen with respect to the demanded amount.

[0021] According to the hydrogen supply method having the above configuration, the first hydrogen having a smaller CO2 emission coefficient can be preferentially supplied. Therefore, according to the hydrogen supply method of the present invention, it is possible to suppress CO2 emissions. According to this hydrogen supply method, it is possible to suppress Scope 3 CO2 emissions.

[0022] (10) In the hydrogen supply method, it is preferable that the first flow rate control unit is configured with a first pressure reducing valve, the second flow rate control unit is configured with a second pressure reducing valve, and a set value of the first hydrogen supply pressure downstream of the first pressure reducing valve is made larger than a set value of the second hydrogen supply pressure downstream of the second pressure reducing valve. According to the above configuration, Scope 3 CO2 emissions can be suppressed with a simple configuration using a pressure reducing valve.

[0023] [Details of the embodiment of the present invention] (Overall configuration of steam supply system) FIG. 1 is a schematic diagram showing a steam supply system according to a first embodiment of the present invention. The steam supply system 10 shown in FIG. 1 is a first embodiment of the steam supply system according to the present invention. In the following description, the steam supply system 10 according to the first embodiment is also referred to as a first steam supply system 10A. Note that, when simply referring to the "steam supply system 10" below, a configuration common to the first steam supply system 10A and a steam supply system 10 according to another embodiment (a second steam supply system 10B described later, see FIG. 7) will be described. Here, the overall configuration of the steam supply system 10 according to the present invention will be described based on the first steam supply system 10A.

[0024] 1, the steam supply system 10 is a system that supplies steam to a process that has a heat demand, and includes a hydrogen boiler 20 and a hydrogen supply facility 30. The steam supply system 10 of this embodiment supplies steam S generated by the hydrogen boiler 20 to, for example, a vulcanizer (not shown) that is arranged in a part of the tire manufacturing process. The vulcanizer is a device that vulcanizes and molds raw tires, and uses (consumes) the steam S to heat and pressurize the raw tires.

[0025] (Hydrogen boiler) The hydrogen boiler 20 is a device that generates steam S using hydrogen H as fuel, and includes a hydrogen supply inlet 21 and a steam outlet 22. The hydrogen supply inlet 21 is connected to a hydrogen piping 40 (third piping 43 described later) through which hydrogen H as fuel is supplied. The hydrogen boiler 20 generates steam S using hydrogen H supplied from the hydrogen supply equipment 30 through the hydrogen piping 40 as fuel. The steam outlet 22 is connected to a steam piping 25. The steam supply system 10 supplies the steam S generated by the hydrogen boiler 20 to the vulcanizer via the steam piping 25.

[0026] (Hydrogen supply equipment) The hydrogen supply equipment 30 supplies hydrogen H to the hydrogen boiler 20 in response to a request from the hydrogen boiler 20. The hydrogen supply equipment 30 includes a first hydrogen supply equipment 31 and a second hydrogen supply equipment 32. The first hydrogen supply equipment 31 and the second hydrogen supply equipment 32 supply different types of hydrogen H. In the following description, the hydrogen H supplied by the first hydrogen supply equipment 31 is referred to as first hydrogen H1, and the hydrogen H supplied by the second hydrogen supply equipment 32 is referred to as second hydrogen H2 to distinguish between them.

[0027] The steam supply system 10 handles hydrogen H with different CO2 emission coefficients C as different types of hydrogen H. The steam supply system 10 sets a usage priority according to the type of hydrogen H to be used. In the steam supply system 10 of the present invention, the first hydrogen H1 has the highest usage priority, and the second hydrogen H2 has a lower usage priority than the first hydrogen H1. The usage priority is set based on the magnitude of the CO2 emission coefficient C of each of the hydrogen H1 and H2.

[0028] In the steam supply system 10 of this embodiment, the CO2 emission coefficient C1 of the first hydrogen H1 is 0 (kg-CO2 / Nm 3 ) (see Figure 2). The CO2 emission coefficient C1 is calculated based on the Scope 3 CO2 emissions associated with the production of the first hydrogen H1. In other words, the Scope 3 CO2 emissions of the first hydrogen H1 are "0".

[0029] In the steam supply system 10 of this embodiment, the CO2 emission coefficient C2 of the second hydrogen H2 is 0.3 (kg-CO2 / Nm3 ) (see FIG. 3). The CO2 emission coefficient C2 is calculated based on the Scope 3 CO2 emissions associated with the generation of the second hydrogen H2. In the steam supply system 10 of this embodiment, the second hydrogen H2 is generated in a plant located in a remote location, then transported by a hydrogen trailer and introduced into the steam supply system 10. The CO2 emission coefficient C2 is calculated taking into account at least the CO2 generated in the plant and the CO2 generated during transportation by the hydrogen trailer.

[0030] The CO2 emission coefficient C1 is smaller than the CO2 emission coefficient C2. In the steam supply system 10 of this embodiment, the CO2 emission coefficient C1 of the first hydrogen H1, which has the highest usage priority, is 0 (kg-CO2 / Nm 3 ) is most preferable, but it is sufficient if it is smaller than the CO2 emission coefficient C2 of the second hydrogen H2.

[0031] The steam supply system 10 of the present embodiment may handle hydrogen H with different production costs as different types of hydrogen H. In this case, it is preferable to set the use priority of the hydrogen H based on the production cost of the hydrogen H, and it is preferable to define the hydrogen H with the lowest production cost as the first hydrogen H1 and set the use priority to be the highest. The steam supply system 10 may weight the CO2 emission coefficient C and the production cost according to the degree of importance, and set the use priority taking both factors into consideration.

[0032] (Hydrogen piping) The hydrogen supply equipment 30 includes hydrogen piping 40. The hydrogen piping 40 is a piping through which hydrogen H supplied from the hydrogen supply equipment 30 to the hydrogen boiler 20 passes. The hydrogen piping 40 includes a first piping 41, a second piping 42, and a third piping 43. The third piping 43 includes a header pipe 44 provided upstream. The first piping 41 and the second piping 42 are connected to the header pipe 44, which is a part of the third piping 43. The first piping 41 connects the first hydrogen supply equipment 31 and the header pipe 44 (third piping 43). The second piping 42 connects the second hydrogen supply equipment 32 and the header pipe 44 (third piping 43).

[0033] (First Hydrogen Supply Facility) 1 and 2, the first hydrogen supply facility 31 includes a hydrogen generation facility 50. As shown in FIG.

[0034] 2, the hydrogen generation facility 50 includes a power supply device 51, a water electrolysis device 52, and a hydrogen tank 53. The water electrolysis device 52 electrolyzes water using electricity transmitted from the power supply device 51 to generate first hydrogen H1. The hydrogen tank 53 stores the first hydrogen H1 generated by the water electrolysis device 52.

[0035] In the steam supply system 10 of this embodiment, the power supply device 51 includes a first power supply device 51A and a second power supply device 51B. The first power supply device 51A is a power receiving device that receives electricity from an external power source (CO2-free power source) that supplies electricity generated by a method that does not generate carbon dioxide. The second power supply device 51B is a solar power generation device. Note that, although the steam supply system 10 of this embodiment includes two systems of power supply devices 51 (the first power supply device 51A and the second power supply device 51B), the number of systems of the power supply devices 51 may be one system or three or more systems.

[0036] The steam supply system 10 preferably employs a device that generates electricity by a method that does not generate carbon dioxide as the power supply device 51. In this case, the CO2 emission coefficient C1 of the first hydrogen H1 generated by the hydrogen generation facility 50 is set to 0 (kg-CO2 / Nm 3 In this case, the first hydrogen supply facility 31 can be configured such that the CO2 emission coefficient C1 is "0" (kg-CO2 / Nm 3 In the steam supply system 10 of the present invention, the first hydrogen H1 having a CO2 emission coefficient C1 of 0 (kg-CO2 / Nm 3 ) as long as it is smaller than the CO2 emission coefficient C2 of the second hydrogen H2.

[0037] As described above, in the steam supply system 10 of the present embodiment, the first hydrogen H1 has a CO2 emission coefficient C1 of 0. According to the steam supply system 10 having such a configuration, it is possible to suppress Scope 3 CO2 emissions.

[0038] As shown in FIG. 1, the first hydrogen supply facility 31 further includes a first pressure reducing valve 55 , a first check valve 56 , a first flow meter 57 , and a first electric valve 58 provided on the first pipe 41 .

[0039] The first pressure reducing valve 55 adjusts the pressure of the first hydrogen H1 downstream of the first pressure reducing valve 55 to a desired set value P1 (supply pressure). In the first steam supply system 10A, the first pressure reducing valve 55 functions as a flow rate adjusting unit (first flow rate adjusting unit) that adjusts the flow rate F1 of the first hydrogen H1.

[0040] The first hydrogen H1 generated by the hydrogen generation equipment 50 flows downstream in the first piping 41 when the first electric valve 58 is "opened", and is sent to the first pressure reducing valve 55 through the first check valve 56. The first hydrogen H1 is sent to the header pipe 44 (third piping 43) after the pressure of the first hydrogen H1 is adjusted to a set value P1 by the first pressure reducing valve 55. In this description, the set value P1 of the pressure of the first hydrogen H1 downstream of the first pressure reducing valve 55 is set to 0.8 (MPa). This value of 0.8 (MPa) is an example. The first flow meter 57 measures the flow rate F1 of the first hydrogen H1 sent to the header pipe 44 (third piping 43).

[0041] As described above, in the steam supply system 10 of the present embodiment, the first hydrogen supply facility 31 includes the hydrogen generation facility 50 that generates the first hydrogen H1. According to the steam supply system 10 configured as described above, it is possible to generate the hydrogen H at a location close to the site where the hydrogen H is consumed. This makes it possible to suppress Scope 3 CO2 emissions.

[0042] (Second hydrogen supply facility) 1 and 3, the second hydrogen supply facility 32 includes a hydrogen receiving facility 60. The hydrogen receiving facility 60 ...

[0043] As shown in Fig. 3, the hydrogen receiving facility 60 includes a hydrogen regulator 61 and a connection pipe 62. The hydrogen regulator 61 and the connection pipe 62 are installed in a stockyard Y for stocking hydrogen containers CT. The hydrogen regulator 61 is connected to the hydrogen containers CT in the stockyard Y by the connection pipe 62. The hydrogen containers CT are transported from an external hydrogen production plant to the stockyard Y by a hydrogen trailer.

[0044] The hydrogen regulating device 61 adjusts the temperature, pressure, etc. of the compressed hydrogen stored in the hydrogen container CT to generate second hydrogen H2. The second hydrogen H2 supplied by the second hydrogen supply facility 32 may be generated by the hydrogen regulating device 61 adjusting the temperature, pressure, etc. of liquefied hydrogen stored in a tank (not shown).

[0045] In the steam supply system 10 of this embodiment, the CO2 emission coefficient C2 of the second hydrogen H2 is determined taking into consideration at least the CO2 generated during hydrogen production at a plant in a remote location and the CO2 generated during transportation by a hydrogen trailer. In the steam supply system 10 of the present invention, the CO2 emission coefficient C2 of the second hydrogen H2 supplied by the second hydrogen supply facility 32 is greater than the CO2 emission coefficient C1 of the first hydrogen H1 (C2>C1).

[0046] As shown in FIG. 1, the second hydrogen supply facility 32 further includes a second pressure reducing valve 65 , a second check valve 66 , a second flow meter 67 , and a second electric valve 68 provided on the second pipe 42 .

[0047] The second pressure reducing valve 65 adjusts the pressure of the second hydrogen H2 downstream of the second pressure reducing valve 65 to a desired set value P2. In the first steam supply system 10A, the second pressure reducing valve 65 functions as a flow rate adjusting unit (second flow rate adjusting unit) that adjusts the flow rate F2 of the second hydrogen H2.

[0048] The second hydrogen H2 generated by the hydrogen regulator 61 flows downstream in the second pipe 42 when the second electric valve 68 is "opened", and is sent to the second pressure reducing valve 65 through the second check valve 66. The second hydrogen H2 is adjusted to a set pressure value P2 by the second pressure reducing valve 65, and then sent to the header pipe 44 (third pipe 43). In this description, the set pressure value P2 of the second hydrogen H2 downstream of the second pressure reducing valve 65 is set to 0.7 (MPa). This value of 0.7 (MPa) is an example. In the steam supply system 10 of the present invention, the set pressure value P2 of the second hydrogen H2 is smaller than the set pressure value P1 of the first hydrogen H1 (P1>P2). The second flow meter 67 measures the flow rate F2 of the second hydrogen H2 sent to the header pipe 44 (third pipe 43).

[0049] The first hydrogen H1 and the second hydrogen H2 are collected in a header pipe 44 (third piping 43) to become hydrogen H to be supplied to the hydrogen boiler 20. The hydrogen supply equipment 30 sets a set value P1 of the pressure of the first hydrogen H1 and a set value P2 of the pressure of the second hydrogen H2 so that the hydrogen H in the third piping 43 is ensured to have a minimum pressure Pmin required for supplying to the hydrogen boiler 20. The hydrogen H flowing through the third piping 43 is reduced in pressure from Pmin to a pressure Pt suitable for supplying to the hydrogen boiler 20 by the pressure reducing valve 23. In the first steam supply system 10A, the pressure Pmin is set to 0.7 (MPa) and the pressure Pt is set to 50 (kPa). The hydrogen H at a pressure Pmin (=0.7 (MPa)) is reduced in pressure to Pt (=50 (kPa)) by the pressure reducing valve 23.

[0050] In the steam supply system 10 of the present invention, the hydrogen H requirement Ft of the hydrogen boiler 20, the supply amount (flow rate F1) of the first hydrogen H1 by the first hydrogen supply equipment 31, and the supply amount (flow rate F2) of the second hydrogen H2 by the second hydrogen supply equipment 32 have a relationship of Ft = F1 + F2.

[0051] As described above, in the steam supply system 10 of the present embodiment, the second hydrogen supply facility 32 includes the hydrogen receiving facility 60 that receives the second hydrogen H2 from the outside. According to the steam supply system 10 configured in this manner, it is possible to realize a stable supply of hydrogen H while suppressing Scope 3 CO2 emissions.

[0052] (Controller according to the first embodiment) FIG. 4 is a control block diagram of the steam supply system according to the first embodiment of the present invention. As shown in FIGS. 1 and 4, the steam supply system 10 further includes a controller 70. The controller 70 is a device that calculates the amount of CO2 emission α from the steam supply system 10. The controller 70 shown in FIG. 4 is a first embodiment of the controller 70 constituting the steam supply system 10, and is also referred to as a first controller 70A. The first controller 70A is provided in the first steam supply system 10A. In the following, when simply referring to the "controller 70", a configuration common to the first controller 70A and a controller 70 according to another embodiment (a second controller 70B described later, see FIG. 8) will be described. Here, the basic configuration of the controller 70 provided in the steam supply system 10 will be described based on the first controller 70A.

[0053] 4, the controller 70 includes a calculation unit 71 and a storage unit 72. The controller 70 is configured by a personal computer in which a calculation program for calculating the CO2 emission amount α and the like is installed, or other control device.

[0054] The calculation unit 71 calculates the CO2 emission amount α based on the calculation program. The storage unit 72 stores coefficients (CO2 emission coefficients C1, C2) and the like required for the calculation unit 71 to calculate the CO2 emission amount α.

[0055] 4, the controller 70 is connected to the first flow meter 57 and the second flow meter 67. The controller 70 receives a measurement value of the flow rate F1 of the first hydrogen H1 from the first flow meter 57, and a measurement value of the flow rate F2 of the second hydrogen H2 from the second flow meter 67. The calculation unit 71 calculates the CO2 emission amount α of the steam supply system 10 based on the following formula (1).

[0056] α = C1 × F1 + C2 × F2 (1)

[0057] As described above, the steam supply system 10 of the present invention includes a first flowmeter 57 that measures the flow rate F1 of the first hydrogen H1 flowing through the first piping 41, a second flowmeter 67 that measures the flow rate F2 of the second hydrogen H2 flowing through the second piping 42, and a controller 70 that calculates the amount of CO2 emissions α associated with the generation of steam S by the hydrogen boiler 20, based on the flow rate F1 of the first hydrogen H1 measured by the first flowmeter 57 and the flow rate F2 of the second hydrogen H2 measured by the second flowmeter 67. According to the steam supply system 10 configured in this manner, Scope 3 CO2 emissions can be easily managed.

[0058] (Hydrogen supply method in the first steam supply system) FIG. 5 is a diagram showing the relationship between the supply amount of the first hydrogen and the second hydrogen and the required amount of hydrogen. In this embodiment, the amount of hydrogen H required by the hydrogen boiler 20 (required amount Ft) is 0 to 400 (Nm 3 1 to 3, in the first steam supply system 10A, the supply capacity of the first hydrogen supply device 31 for supplying the first hydrogen H1 varies between, for example, 0 and 120 (Nm 3 / h), and the supply capacity of the second hydrogen supply facility 32 is, for example, 0 to 400 (Nm 3 / h). In this case, the maximum supply amount F1max of the first hydrogen H1 from the first hydrogen supply facility 31 is 120 (Nm 3 / h).

[0059] The second hydrogen supply equipment 32 is ensured to have a supply capacity sufficient to meet the demand Ft of the hydrogen boiler 20 by the second hydrogen supply equipment 32 alone in the event of a breakdown in the first hydrogen supply equipment 31. The first steam supply system 10A configured in this manner can stably supply hydrogen H to the hydrogen boiler 20.

[0060] In the first steam supply system 10A, the first hydrogen H1 is set to have a higher priority for use than the second hydrogen H2. For this reason, as shown in FIG. 5, the first steam supply system 10A operates when the required amount Ft of hydrogen H of the hydrogen boiler 20 is 120 (Nm 3 / h), only the first hydrogen H1 is supplied to the hydrogen boiler 20. Specifically, in this case, the first pressure reducing valve 55 adjusts the flow rate F1 of the first hydrogen H1 in accordance with the required amount Ft, and the second pressure reducing valve 65 adjusts the flow rate F2 of the second hydrogen H2 to 0.

[0061] As shown in FIG. 5, the first steam supply system 10A is configured such that the hydrogen boiler 20 requires 120 (Nm 3 / h), the first hydrogen H1 is supplied by the first hydrogen supply equipment 31 at a maximum supply amount (120 (Nm 3 / h), and the second hydrogen supply facility 32 supplies the second hydrogen H2 in an amount to make up for the shortage. Specifically, in this case, the first pressure reducing valve 55 controls the flow rate F1 of the first hydrogen H1 to the maximum supply amount F1max (=120 (Nm 3 / h), and the second pressure reducing valve 65 adjusts the maximum supply amount (120 (Nm 3 / h) Shortage (Ft-120(Nm 3 The flow rate F2 of the second hydrogen H2 is adjusted according to the flow rate F2 of the second hydrogen H2.

[0062] In the first steam supply system 10A, the set pressure value P1 (= 0.8 (MPa)) of the first hydrogen H1 is larger than the set pressure value P2 (= 0.7 (MPa)) of the second hydrogen H2. Therefore, while the supply amount (flow rate F1) of the first hydrogen H1 by the first hydrogen supply equipment 31 is sufficient for the required amount Ft of the hydrogen boiler 20, only the first hydrogen H1, which is at a higher pressure, naturally flows to the header pipe 44 (third piping 43). At this time, the second hydrogen H2, which is at a lower pressure, does not flow to the header pipe 44.

[0063] When the supply amount (flow rate F1) of the first hydrogen H1 by the first hydrogen supply equipment 31 is insufficient for the hydrogen H demand amount Ft of the hydrogen boiler 20, the first hydrogen H1 is supplied from the first hydrogen supply equipment 31 at the maximum supply amount (120 (Nm 3 2. / h), the pressure of the hydrogen H in the header pipe 44 will not be maintained at 0.8 (MPa). Then, as the shortfall in the supply amount (flow rate F1) of the first hydrogen H1 relative to the required amount Ft increases, the pressure of the hydrogen H in the header pipe 44 will eventually fall below 0.7 (MPa). At this time, the second hydrogen H2 in an amount equivalent to the shortfall in the supply amount (flow rate F1) of the first hydrogen H1 relative to the required amount Ft of the hydrogen boiler 20 is naturally supplied from the second hydrogen supply equipment 32 to the header pipe 44. At this time, the pressure of the hydrogen H in the header pipe 44 is maintained at 0.7 (MPa).

[0064] With this configuration, the first steam supply system 10A adjusts the flow rates of the first hydrogen H1 and the second hydrogen H2 using the first pressure reducing valve (first flow rate adjustment unit) 55 and the second pressure reducing valve (second flow rate adjustment unit) 65, and preferentially supplies the first hydrogen H1 to the hydrogen boiler 20. The first steam supply system 10A configured in this manner can adjust the flow rates of the first hydrogen H1 and the second hydrogen H2 without using an automatic control device. In this way, the first steam supply system 10A can suppress Scope 3 CO2 emissions despite having a simple configuration using the first pressure reducing valve 55 and the second pressure reducing valve 65.

[0065] As explained above, in the first steam supply system 10A and its hydrogen supply method of the present invention, the set value P1 (= 0.8 (MPa)) of the pressure of the first hydrogen H1 downstream of the first pressure reducing valve 55 is greater than the set value P2 (= 0.7 (MPa)) of the pressure of the second hydrogen H2 downstream of the second pressure reducing valve 65. With such a configuration, Scope 3 CO2 emissions can be suppressed with a simple configuration using the first pressure reducing valve 55 and the second pressure reducing valve 65 (in other words, without using automatic control equipment).

[0066] (Modification of the first steam supply system) FIG. 6 is a schematic diagram showing a modified example of the steam supply system according to the first embodiment of the present invention. As shown in FIG. 6, the first steam supply system 10A of the present invention may be configured to include a plurality of second hydrogen supply devices 32. The first steam supply system 10A according to the modified example shown in FIG. 6 includes N second hydrogen supply devices 32. In this description, the first second hydrogen supply device 32 is also referred to as the second hydrogen supply device 32(1), and the Nth second hydrogen supply device 32 is also referred to as the second hydrogen supply device 32(N). In this description, the second hydrogen H2 supplied by the first second hydrogen supply device 32 is also referred to as the second hydrogen H2(1), and the second hydrogen H2 supplied by the Nth second hydrogen supply device 32 is also referred to as the second hydrogen H2(N).

[0067] The numbers in parentheses for the N types of second hydrogen H2(1) to second hydrogen H2(N) indicate the usage priority of each. In other words, the smaller the number in parentheses for the second hydrogen H2(1) to second hydrogen H2(N), the higher the usage priority. In this embodiment, the usage priority of the second hydrogen H2(1) to second hydrogen H2(N) is determined based on the magnitude of the CO2 emission coefficient C2 of the second hydrogen H2. Note that the usage priority of the second hydrogen H2(1) to second hydrogen H2(N) may also be determined based on the production cost.

[0068] In the first steam supply system 10A including N second hydrogen supply devices 32, the N second pressure reducing valves 65 set a higher downstream pressure setting value P2 the higher the use priority of the second hydrogen H2 to be supplied, and set a lower setting value P2 the lower the use priority. In other words, the pressure setting values ​​P2(1) to P2(N) of the second pressure reducing valves 65 in the N second hydrogen supply devices 32 have the magnitude relationship P2(1)>P2(2)>···>P2(N-1)>P2(N).

[0069] In this case, the CO2 emission amount α of the first steam supply system 10A is calculated by the following formula (2).

[0070] α=C1×F1+C2(1)×F2(1)+C2(2)×F2(2)+···+C2(N-1)×F2(N-1)+C2(N)×F2(N)···(2)

[0071] The first steam supply system 10A configured in this manner can naturally adjust the supply amount of the second hydrogen H2 in each second hydrogen supply device 32 so as to preferentially supply the second hydrogen H2, which has a higher usage priority.

[0072] The steam supply system 10 of the present invention may be configured to include a plurality of first hydrogen supply facilities 31. In other words, in the steam supply system 10, the first hydrogen supply facilities 31 may be distributed among a plurality of facilities.

[0073] As described above, the steam supply system 10 of the present embodiment includes a plurality of first hydrogen supply facilities 31. According to the steam supply system 10 configured in this manner, the ratio of the first hydrogen H1 to the hydrogen H supplied to the hydrogen boiler 20 can be increased. This makes it possible to suppress Scope 3 CO2 emissions.

[0074] (Steam supply system according to the second embodiment) Fig. 7 is a schematic diagram showing a steam supply system according to a second embodiment of the present invention. Fig. 8 is a control block diagram of the steam supply system according to the second embodiment of the present invention. The steam supply system 10 shown in Fig. 7 is a second embodiment of the steam supply system according to the present invention. The steam supply system 10 according to the second embodiment is also referred to as a second steam supply system 10B.

[0075] 7, the second steam supply system 10B differs from the first steam supply system 10A in that it includes a first flow rate control valve 59 instead of the first pressure reducing valve 55, and in that it includes a second flow rate control valve 69 instead of the second pressure reducing valve 65. Note that a description of configurations common to the first steam supply system 10A and the second steam supply system 10B will be omitted.

[0076] In the second steam supply system 10B, the first hydrogen supply equipment 31 includes a first flow control valve 59, a first check valve 56, a first flow meter 57, and a first electric valve 58, which are provided on the first piping 41. In the second steam supply system 10B, the first flow control valve 59 functions as a flow control unit (first flow control unit) that adjusts the flow rate of the first hydrogen H1.

[0077] When the first electric valve 58 is opened, the first hydrogen H1 generated by the hydrogen generation equipment 50 flows downstream in the first pipe 41 and is sent to the first flow control valve 59 through the first check valve 56. The opening degree of the first flow control valve 59 is changed based on a command signal sent from the controller 70, and the flow rate F1 of the first hydrogen H1 is adjusted.

[0078] In the second steam supply system 10B, the second hydrogen supply equipment 32 includes a second flow control valve 69, a second check valve 66, a second flow meter 67, and a second electric valve 68, which are provided on the second piping 42. In the second steam supply system 10B, the second flow control valve 69 functions as a flow control unit (second flow control unit) that adjusts the flow rate of the second hydrogen H2.

[0079] When the second electric valve 68 is opened, the second hydrogen H2 produced by the hydrogen regulating device 61 flows downstream in the second pipe 42 and is sent to the second flow rate regulating valve 69 through the second check valve 66. The second flow rate regulating valve 69 changes its opening based on a command signal sent from the controller 70 to regulate the flow rate F2 of the second hydrogen H2.

[0080] (Controller according to the second embodiment) As shown in Fig. 7 and Fig. 8, the second steam supply system 10B includes a controller 70 according to a second embodiment (hereinafter, also referred to as a second controller 70B). The second controller 70B is connected to a first flow control valve 59, a second flow control valve 69, a first flow meter 57, and a second flow meter 67. The second controller 70B is further connected to a hydrogen boiler 20. The second controller 70B receives an input of a measured value of a flow rate F1 of the first hydrogen H1 from the first flow meter 57, and an input of a measured value of a flow rate F2 of the second hydrogen H2 from the second flow meter 67. The second controller 70B receives an input of a required amount Ft of hydrogen H from the hydrogen boiler 20.

[0081] The second controller 70B adjusts the apertures of the first flow rate control valve 59 and the second flow rate control valve 69 in accordance with the required amount Ft of hydrogen H. In addition, the second controller 70B feedback-controls the apertures of the first flow rate control valve 59 and the second flow rate control valve 69 based on the measured values ​​of the flow rates F1 and F2.

[0082] The hydrogen boiler 20 hydrogen H requirement Ft is 120 (Nm 3 / h), the second controller 70B adjusts the opening of the first flow control valve 59 in accordance with the demand amount Ft to adjust the flow rate F1 of the first hydrogen H1, and adjusts the opening of the second flow control valve 69 (fully closed) to set the flow rate F2 of the second hydrogen H2 to 0.

[0083] The hydrogen boiler 20 hydrogen H requirement Ft is 120 (Nm 3 / h), the second controller 70B adjusts the opening of the first flow rate adjustment valve 59 (fully open) to set the flow rate F1 of the first hydrogen H1 to the maximum supply amount F1max (=120 (Nm 3 / h), and the shortage of the flow rate F1 of the first hydrogen H1 with respect to the demand amount Ft (Ft-120 (Nm 3 The flow rate F2 of the second hydrogen H2 is adjusted by adjusting the opening of the second flow control valve 69 in accordance with the flow rate F2 of the second hydrogen H2.

[0084] As described above, in the steam supply system 10 of the present invention, the first hydrogen adjustment unit that adjusts the supply amount of the first hydrogen H1, and the second hydrogen adjustment unit that adjusts the supply amount of the second hydrogen H2 may be configured to include automatic control equipment, and are not limited to a simple configuration using a pressure reducing valve like the first steam supply system 10A.

[0085] The second steam supply system 10B may be configured to include a plurality (N units) of second hydrogen supply devices 32. The second steam supply system 10B may be configured to include a plurality of first hydrogen supply devices 31.

[0086] (Product Information) As shown in FIG. 4 and FIG. 8, the controller 70 further generates information on the amount of CO2 emission during the manufacture of the product (hereinafter, also referred to as product information J). The controller 70 further calculates the amount of CO2 emission α / n per product by dividing the calculated amount of CO2 emission α by the number n of products (tires) manufactured during the unit period. The calculation of the amount of CO2 emission α / n of each product may be performed for each product completed. The controller 70 stores the amount of CO2 emission α / n of each product manufactured during the unit period in the storage unit 72. The storage unit 72 may be an external storage device (for example, a product database) provided outside the controller 70. The storage unit 72 (or the product database) stores product information J in which the serial number of each product (tire) is linked to the amount of CO2 emission α / n during the manufacture of the product. The product information J may be information in which the lot number of each product (tire) is linked to the amount of CO2 emission α / n during the manufacture of the product.

[0087] (About carbon footprint) Fig. 9 is a diagram showing an example of a carbon footprint for tires. The steam supply system 10 preferably further generates the carbon footprint shown in Fig. 9 based on the product information J (see Figs. 4 and 8) stored in the storage unit 72 or the product database. The carbon footprint shown in Fig. 9 is a carbon footprint for tires and discloses information on supply chain emissions. The supply chain emissions shown in Fig. 9 include Scope 1 CO2 emissions, Scope 2 CO2 emissions, and Scope 3 CO2 emissions related to the product (tires).

[0088] The steam supply system 10 preferably generates a carbon footprint (see FIG. 9) for each product (or for each lot). By attaching such a carbon footprint to the product (tire) and selling it, it is possible to show the user the reduction in CO2 emissions, and by highlighting that it is an environmentally friendly product, it is possible to increase the appeal to users, and furthermore, it is possible to easily disclose information on Scope 3 CO2 emissions to users.

[0089] As described above, in the steam supply system 10 of the present invention, the controller 70 generates product information J that links the calculated CO2 emission amount α with the product manufactured using the steam S generated by the hydrogen boiler 20. According to the steam supply system 10 configured as above, it is possible to create a carbon footprint of the product based on the product information J. This makes it easy to disclose information about the product's Scope 3 CO2 emissions. [Industrial Applicability]

[0090] The steam supply system described above can be applied not only to the tire manufacturing process but also to a wide range of manufacturing processes for products that consume steam.

[0091] [Note] The present invention includes the following aspects. (1) A system comprising: a hydrogen boiler that generates steam using hydrogen as fuel; a hydrogen supply pipe connected to the hydrogen boiler; a first hydrogen supply device that supplies a first hydrogen among the hydrogen supplied to the hydrogen boiler; a first pipe connecting the first hydrogen supply device and the hydrogen supply pipe; and a first flow rate adjustment unit that adjusts the flow rate of the first hydrogen passing through the first pipe, and further comprising: a second hydrogen supply device that supplies a second hydrogen among the hydrogen supplied to the hydrogen boiler; a second pipe connecting the second hydrogen supply device and the hydrogen supply pipe; and a second flow rate adjustment unit that adjusts the flow rate of the second hydrogen passing through the second pipe, a CO2 emission coefficient of the first hydrogen is smaller than a CO2 emission coefficient of the second hydrogen, and when an amount of hydrogen required by the hydrogen boiler is equal to or less than a maximum supply amount of the first hydrogen from the first hydrogen supply facility, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the required amount and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0, and when the required amount exceeds the maximum supply amount, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen in accordance with a shortfall of the first hydrogen with respect to the required amount. (2) The steam supply system of (1), wherein the first flow rate control unit is constituted by a first pressure reducing valve, the second flow rate control unit is constituted by a second pressure reducing valve, and a set value of the first hydrogen supply pressure downstream of the first pressure reducing valve is larger than a set value of the second hydrogen supply pressure downstream of the second pressure reducing valve. (3) The steam supply system of (1) or (2), further comprising a first flowmeter that measures a flow rate of the first hydrogen flowing through the first piping, a second flowmeter that measures a flow rate of the second hydrogen flowing through the second piping, and a calculation device that calculates CO2 emissions associated with steam generation by the hydrogen boiler based on the flow rate of the first hydrogen measured by the first flowmeter and the flow rate of the second hydrogen measured by the second flowmeter. (4) The steam supply system of (3) above, wherein the computing device generates product information linking the calculated CO2 emissions with products manufactured using the steam generated by the hydrogen boiler. (5) The steam supply system according to any one of (1) to (4), wherein the first CO2 emission coefficient is "0." (6) The steam supply system according to any one of (1) to (5), wherein the first hydrogen supply facility includes a hydrogen generation facility that generates the first hydrogen. (7) The steam supply system according to any one of (1) to (6), wherein the second hydrogen supply facility includes a hydrogen receiving facility that receives the second hydrogen from an outside source. (8) The steam supply system according to any one of (1) to (7), comprising a plurality of the first hydrogen supply facilities. (9) A method of supplying hydrogen to an apparatus that uses hydrogen, the method comprising the steps of: connecting a first hydrogen supply facility that supplies the first hydrogen via a first pipe to a hydrogen supply pipe connected to the apparatus; connecting one or more second hydrogen supply facilities that supply the second hydrogen via second pipes; providing a first flow rate adjustment unit in the first pipe that adjusts a flow rate of the first hydrogen; A hydrogen supply method comprising: providing an adjustment unit in the second piping; when the hydrogen demand of the device is equal to or less than a maximum supply amount of the first hydrogen of the first hydrogen supply equipment, adjusting the flow rate of the first hydrogen by the first flow rate adjustment unit in accordance with the demand; and adjusting the flow rate of the second hydrogen to 0 by the second flow rate adjustment unit; when the demand exceeds the maximum supply amount, adjusting the flow rate of the first hydrogen by the first flow rate adjustment unit to the maximum supply amount; and adjusting the flow rate of the second hydrogen by the second flow rate adjustment unit in accordance with the shortfall of the first hydrogen against the demand. (10) The hydrogen supply method according to (9), wherein the first flow rate control unit is constituted by a first pressure reducing valve, the second flow rate control unit is constituted by a second pressure reducing valve, and a set value of the first hydrogen supply pressure downstream of the first pressure reducing valve is made larger than a set value of the second hydrogen supply pressure downstream of the second pressure reducing valve. [Explanation of symbols]

[0092] 10: Steam supply system 20: Hydrogen boiler 31: First hydrogen supply facility 32: Second hydrogen supply facility 41:First piping 42:Second piping 43: Third pipe (hydrogen supply pipe) 50: Hydrogen generation equipment 55: First pressure reducing valve (first flow rate adjusting part) 59: First flow control valve (first flow control part) 60: Hydrogen receiving facility 65: Second pressure reducing valve (second flow rate control part) 69: Second flow control valve (second flow control part) 70: Controller (computing device) H: Hydrogen S: Steam H1: First hydrogen H2: Secondary hydrogen F1: (First hydrogen) flow rate F2: (second hydrogen) flow rate C1: CO2 emission factor (for the first hydrogen) C2: (Secondary hydrogen) CO2 emission factor J:Product information

Claims

1. A hydrogen boiler that generates steam using hydrogen as fuel; a hydrogen supply pipe connected to the hydrogen boiler; a first hydrogen supply facility for supplying a first hydrogen from the hydrogen supplied to the hydrogen boiler; a first pipe connecting the first hydrogen supply device and the hydrogen supply pipe; a first flow rate adjusting unit that adjusts a flow rate of the first hydrogen passing through the first pipe; With the above in mind, a second hydrogen supply facility for supplying a second hydrogen from the hydrogen supplied to the hydrogen boiler; a second pipe connecting the second hydrogen supply device and the hydrogen supply pipe; a second flow rate adjusting unit that adjusts a flow rate of the second hydrogen passing through the second pipe; Each of the above-mentioned components has one or more of the following: The CO2 emission coefficient of the first hydrogen is smaller than the CO2 emission coefficient of the second hydrogen, When the required amount of hydrogen of the hydrogen boiler is equal to or less than the maximum supply amount of the first hydrogen of the first hydrogen supply facility, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the required amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0; A steam supply system, wherein, when the required amount exceeds the maximum supply amount, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen according to the shortfall of the first hydrogen relative to the required amount.

2. The first flow rate adjustment unit is constituted by a first pressure reducing valve, The second flow rate adjustment unit is constituted by a second pressure reducing valve, 2. The steam supply system according to claim 1, wherein a set value of the first hydrogen pressure downstream of the first pressure reducing valve is greater than a set value of the second hydrogen pressure downstream of the second pressure reducing valve.

3. a first flow meter that measures a flow rate of the first hydrogen flowing through the first pipe; a second flowmeter that measures a flow rate of the second hydrogen flowing through the second pipe; 3. The steam supply system according to claim 1, further comprising: a calculation device that calculates an amount of CO2 emissions associated with steam generation by the hydrogen boiler based on the flow rate of the first hydrogen measured by the first flow meter and the flow rate of the second hydrogen measured by the second flow meter.

4. The computing device includes: The steam supply system according to claim 3 , further comprising: generating product information that links the calculated amount of CO 2 emissions with a product manufactured using the steam generated by the hydrogen boiler.

5. The steam supply system according to claim 1 or 2, wherein the first hydrogen has a CO2 emission coefficient of "0".

6. The steam supply system according to claim 1 or 2, wherein the first hydrogen supply facility includes a hydrogen generating facility that generates the first hydrogen.

7. The steam supply system according to claim 1 or 2, wherein the second hydrogen supply facility includes a hydrogen receiving facility that receives the second hydrogen from an outside source.

8. The steam supply system according to claim 1 or 2, comprising a plurality of the first hydrogen supply facilities.

9. A method for supplying hydrogen to a hydrogen-using device, comprising the steps of: The hydrogen includes a first hydrogen and a second hydrogen, The CO2 emission coefficient of the first hydrogen is smaller than the CO2 emission coefficient of the second hydrogen, A hydrogen supply pipe connected to the device is a first hydrogen supply facility that supplies the first hydrogen is connected via a first pipe; One or more second hydrogen supply facilities for supplying the second hydrogen are connected via second piping, a first flow rate adjusting unit that adjusts a flow rate of the first hydrogen is provided in the first pipe; a second flow rate adjusting unit that adjusts a flow rate of the second hydrogen is provided in the second pipe; When the required amount of hydrogen of the device is equal to or less than the maximum supply amount of the first hydrogen of the first hydrogen supply facility, the first flow rate adjustment unit adjusts the flow rate of the first hydrogen in accordance with the required amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen to 0; A hydrogen supply method, when the requested amount exceeds the maximum supply amount, wherein the first flow rate adjustment unit adjusts the flow rate of the first hydrogen to the maximum supply amount, and the second flow rate adjustment unit adjusts the flow rate of the second hydrogen in accordance with the shortfall of the first hydrogen relative to the requested amount.

10. The first flow rate adjustment unit is configured by a first pressure reducing valve, The second flow rate adjustment unit is configured by a second pressure reducing valve, 10. The hydrogen supply method according to claim 9, wherein a set value of the first hydrogen supply pressure downstream of the first pressure reducing valve is made higher than a set value of the second hydrogen supply pressure downstream of the second pressure reducing valve.

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