CO2eq emission amount evaluation device, CO2eq emission amount evaluation system, and CO2eq emission amount evaluation method

Abstract

And evaluating the CO2eq emission during hydrogen transaction. The present invention is a CO2eq emission amount evaluation device capable of communicating with a plant system and an authentication system involving hydrogen production via a network, the device being provided with a communication unit for receiving, from the plant system, hydrogen-specific information of a CO2 emission amount during hydrogen production and hydrogen to be produced, and an authentication information acquisition unit for acquiring the hydrogen-specific information of the hydrogen to be produced and the CO2 emission amount from the plant system. And requesting authentication of the CO2 emission amount associated with the hydrogen specific information from the authentication system, and acquiring authentication information of the CO2 emission amount associated with the hydrogen specific information.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a CO2eq emission amount evaluation device, a CO2eq emission amount evaluation system, and a CO2eq emission amount evaluation method. BACKGROUND

[0002] Hydrogen, which does not emit CO2 even if it is burned, is expected as an energy source that can suppress global warming. Although hydrogen can be manufactured from various resources, a small amount of CO2 is sometimes emitted at the time of manufacturing or extraction of hydrogen from a hydrogen carrier.

[0003] There is known a technology considered in connection with external charging using a renewable energy source (for example, see Patent Literature 1). Patent Literature 1 discloses a server that issues a coupon usable at a store in the vicinity of a power supply device to a user of a vehicle that has performed CO2-free charging when the vehicle has performed CO2-free charging.

[0004] PRIOR ART DOCUMENTS PATENT LITERATURE Patent Literature 1: Japanese Patent No. 2020-102024 SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION However, there is a problem in the related art that the amount of CO2eq emitted is not evaluated at the time of hydrogen transaction.

[0005] In view of the above problem, the present disclosure provides a technology capable of evaluating the amount of CO2eq emission at the time of hydrogen transaction.

[0006] MEANS FOR SOLVING THE PROBLEMS The present invention is a CO2 emission amount evaluation device that can communicate with a factory system and an authentication system related to hydrogen manufacturing through a network, and has a communication unit that receives a CO2 emission amount at the time of hydrogen manufacturing and hydrogen-specific information of hydrogen manufactured from the factory system, and an authentication information acquisition unit that requests authentication of the CO2 emission amount associated with the hydrogen-specific information to the authentication system, and acquires authentication information of the CO2 emission amount associated with the hydrogen-specific information.

[0007] EFFECTS OF THE INVENTION The present disclosure can provide a technology capable of evaluating the amount of CO2eq emission at the time of hydrogen transaction. BRIEF DESCRIPTION OF DRAWINGS

[0008]

Figure 1

[0009]

Figure 2

[0010]

【Figure 3 FIG. 1 is a hardware configuration diagram showing an example of a CO2 emission amount evaluation device, an authentication system, and a factory system.

[0011] Figure 4 FIG. 2 is a functional configuration diagram showing an example of a CO2 emission amount evaluation system.

[0012] Figure 5 FIG. 3 is a diagram illustrating an authentication method using an electronic signature.

[0013] Figure 6 FIG. 4 is a diagram illustrating an authentication phase with respect to a hydrogen source, a hydrogen carrier, and hydrogen extraction.

[0014] Figure 7 FIG. 5 is a diagram illustrating a case where hydrogen extracted from a hydrogen carrier is mixed with hydrogen manufactured from other raw materials.

[0015] Figure 8 FIG. 6 is an example of a flowchart illustrating a flow of a process in which a simulation unit calculates an amount of hydrogen extraction.

[0016] Figure 9 FIG. 7 is an example of a flowchart illustrating an overall flow of a process performed by an authentication system, a CO2 emission amount evaluation device, and a factory system.

[0017] Figure 10 FIG. 8 is an example of a flowchart illustrating a calculation of carbon intensity and an authentication flow in a case where a hydrogen source is one.

[0018] Figure 11 FIG. 9 is an example of a flowchart illustrating a calculation of carbon intensity and an authentication flow in a case where a hydrogen source is two.

[0019] Figure 12 FIG. 10 is an example of a flowchart illustrating a calculation of carbon intensity and an authentication flow in a case where a hydrogen carrier is two.

[0020] Figure 13 FIG. 11 is an example of a flowchart illustrating a calculation of carbon intensity and an authentication flow in a case where hydrogen is extracted from a hydrogen carrier and hydrogen is manufactured using an existing process.

[0021] Figure 14A FIG. 12 is a diagram illustrating a case where hydrogen extracted from an MCH is increased in production on the basis of hydrogen manufactured from an existing raw material.

[0022] Figure 14B FIG. 13 is a diagram illustrating a case where a manufacturing speed of hydrogen manufactured from an existing raw material is reduced to make room (free) for hydrogen extracted from an MCH. DETAILED DESCRIPTION

[0023] ​​​​​​​​​​​​Hereinafter, as an example of a mode of carrying out the present application, a CO2 emission amount evaluation system and a CO2 emission amount evaluation method performed by the CO2 emission amount evaluation system will be described with reference to the drawings.

[0024] <CO2 emission amount evaluation system> Hydrogen emits CO2 corresponding to the process in each process of the production of renewable energy, the production of low-carbon hydrogen, the production of hydrogen using renewable energy, the production of hydrogen carriers, and the extraction of hydrogen from hydrogen carriers. Since the place where each process is implemented varies, the transaction partner who finally purchases hydrogen, etc. is unclear about how much CO2 is emitted to produce the hydrogen, and it is difficult to perform a fair transaction that reflects the value corresponding to the CO2 emission amount. Therefore, in the present disclosure, authentication is performed at each stage of these hydrogen production, etc., and authentication information is provided together with the hydrogen.

[0025] Figure 1 is a schematic diagram illustrating the flow of the production of hydrogen carriers and the extraction of hydrogen from hydrogen carriers. Hydrogen carriers refer to media and methods for efficiently storing and transporting hydrogen that is less efficient to store or transport in a gaseous state. Hydrogen carriers include MCH (methylcyclohexane), liquid hydrogen, etc. The extraction of hydrogen refers to the extraction of hydrogen (dehydrogenation) from hydrogen carriers.

[0026] In Figure 1 , CO2-free hydrogen is produced, and a hydrogen carrier containing the CO2-free hydrogen is produced at a production facility 63. The hydrogen produced at the production facility 63 is transported to a storage facility 61. A hydrogen extraction facility 62 extracts hydrogen from the hydrogen carrier of the storage facility 61. The extracted hydrogen is supplied to a transaction partner 64. The transaction partner 64 is various, such as a hydrogen refueling station, a general household, a power plant, or a factory, etc.

[0027] As the transaction partner 64, it is sometimes desirable to perform a transaction in which the fact that the purchased hydrogen is produced from how much CO2 emission amount is reflected in the value. The emission of CO2 mainly occurs at the time of renewable energy production, at the time of hydrogen production, at the time of transportation, and at the time of hydrogen extraction. The CO2 emission amount evaluation system of the present embodiment, for example, calculates the CO2 emission amount at the time of hydrogen production and at the time of hydrogen extraction, and calculates the carbon intensity from the CO2 emission amount. In addition, the CO2 emission amount evaluation system authenticates the carbon intensity, the hydrogen, and the process (at the time of hydrogen production and at the time of hydrogen extraction, etc.) as described below. In addition, the carbon intensity refers to an index indicating the unit emission amount of carbon emitted at the time of production of the product, and the smaller the value, the less the CO2 emission amount. The carbon intensity is the CO2 emission amount with respect to a certain reference (e.g., conventional CO2 emission amount).

[0028] (i) The CO2 emission amount evaluation device authenticates the carbon intensity corresponding to the hydrogen at the time of hydrogen production.

[0029] (ii) The CO2 emission amount evaluation device authenticates the carbon intensity in correspondence with the hydrogen at the time of hydrogen extraction.

[0030] Since the hydrogen of the transaction is associated with the carbon intensity and has been authenticated, even if the hydrogen is manufactured in a foreign country or a remote area, a fair transaction reflecting the value of the corresponding carbon intensity can be realized. Furthermore, transparency and traceability can be ensured in the hydrogen transaction.

[0031] <About the terms> Authentication refers to proving that the establishment and record of a document (in this embodiment, electronic data) are made through proper procedures. The authentication method can be a method agreed upon between multiple countries, or authentication by a third-party organization, etc. In this embodiment, it refers to proving that the CO2 emission amount emitted at the time of hydrogen production, etc. is correct. Authentication information is information proving that authentication has been performed.

[0032] Hydrogen-specific information is information for specifying manufactured hydrogen, etc. Although hydrogen is amorphous, it is specified by information unique to the manufacturing site, time period, and manufacturing amount, etc. The hydrogen-specific information can also be a lot number, etc. if the manufacturing site is the same, associated with the time period and manufacturing amount.

[0033] CO2eq is an abbreviation for "CO2 equivalent," and refers to a gas having the same greenhouse effect as CO2. The emission amount of other gases can be converted to CO2 equivalent using the global warming potential (GWP). In this embodiment, the evaluation of the CO2 emission amount is explained, but the emission amount of other gases can also be calculated in the same way, and the evaluation of the CO2eq emission amount can be performed. The CO2 emission amount evaluation device 10 is an example of a CO2eq emission amount evaluation device.

[0034] <Example of system structure> Figure 2 is a diagram showing an example of the system structure of the CO2 emission amount evaluation system 100. In the CO2 emission amount evaluation system 100, the CO2 emission amount evaluation device 10, the authentication system 30, and the factory system 40 are communicably connected via a network N. The network N can be a wide area network such as the Internet, or a dedicated network such as a VPN (Virtual Private Network). Furthermore, the CO2 emission amount evaluation device 10 only needs to be able to communicate with the authentication system 30 and the factory system 40, and the authentication system 30 and the factory system 40 can not communicate with each other.

[0035] The authentication system 30 issues a REC (Renewable Energy Certificate) while performing the above-described (i) and (ii) authentication at the time of hydrogen production and at the time of hydrogen extraction. The specific authentication method is not a feature of the present embodiment, and any authentication method can be employed. As one example, the authentication system 30 performs authentication by affixing an electronic signature to the carbon intensity or the like. The affixing method of the electronic signature will be described later in detail.

[0036] The plant system 40 is a server or the like system that manages a plant facility that produces renewable energy, produces hydrogen, or extracts hydrogen. The plant system 40, for example, produces hydrogen (in the present embodiment, CO2-free hydrogen), produces a hydrogen carrier such as MCH (methylcyclohexane) that is a compound of hydrogen and toluene from the hydrogen, or produces hydrogen from raw materials 1, 2 (for example, LPG (Liquefied Petroleum Gas) or the like) by an existing process. Further, the plant system 40 extracts hydrogen (for example, dehydrogenation) from the hydrogen carrier in a method suitable for the hydrogen carrier. The hydrogen carrier can be ammonia, a hydrogen storage material, methane, a hydrogen storage material, or the like, and can be transported in the form of liquefied hydrogen or compressed hydrogen.

[0037] Therefore, the plant system 40 does not necessarily have to be located at one place, and can exist at each plant that produces hydrogen or extracts hydrogen. Further, the plant system 40 can be referred to as a plant, a refinery, a production plant, or the like, as long as it is a facility that produces hydrogen or extracts hydrogen.

[0038] The CO2 emission amount evaluation device 10 is an information processing system such as a server managed by a company that performs one or more of circulation, production, or sale of hydrogen. The CO2 emission amount evaluation device 10 communicates with the plant system 40, calculates the CO2 emission amount and the carbon intensity at the time of renewable energy production, at the time of hydrogen production, at the time of hydrogen carrier production, and at the time of hydrogen extraction, or compares the carbon intensity with a threshold value to evaluate whether or not it can be referred to as CO2-free. Further, the CO2 emission amount evaluation device 10 communicates with the authentication system 30, requests authentication of the carbon intensity of each process to the authentication system 30, and acquires authentication information. The processes to be authenticated are, for example, at the time of hydrogen production and at the time of hydrogen extraction, but are not limited thereto, and can be any process that emits CO2, such as at the time of renewable energy production and at the time of hydrogen carrier production.

[0039] In addition, the CO2 emission amount evaluation device 10 can be realized by cloud computing or by a single information processing device. The cloud computing refers to a form of using resources on a network without being aware of specific hardware resources. The CO2 emission amount evaluation device 10 can exist on the Internet or can be deployed locally.

[0040] Although Figure 2not shown, but a terminal device operated by the user can be connected to the network N. Since the CO2 emission amount evaluation device 10, the authentication system 30, and the factory system 40 can have a function of a Web server, the user can connect the terminal device to these systems, and perform display and information transmission of arbitrary information such as authentication information, and the like. The terminal device can be, for example, a PC (Personal Computer) used by the user, a smartphone, a tablet terminal, or the like, and can be any device as long as it can run a Web browser.

[0041] <Hardware configuration example> Referring to Figure 3 , a hardware configuration of the CO2 emission amount evaluation device 10, the authentication system 30, and the factory system 40 involved in the present embodiment will be described. Figure 3 is a diagram showing an example of the hardware configuration of the CO2 emission amount evaluation device 10, the authentication system 30, and the factory system 40 involved in the present embodiment. As shown in Figure 3 , the CO2 emission amount evaluation device 10, the authentication system 30, and the factory system 40 are constructed by a computer 500, and have a CPU 501, a ROM 502, a RAM 503, a HD (Hard Disk) 504, a HDD (Hard Disk Drive) controller 505, a display 506, an external device connection I / F (Interface) 508, a network I / F 509, a bus 510, a keyboard 511, a pointing device 512, a DVD-RW (Digital Versatile Disk Rewritable) drive 514, and a medium I / F 516.

[0042] The CPU 501 controls the entire operation of the computer 500. The ROM 502 stores a program for driving the CPU 501, such as IPL. The RAM 503 is used as a work area of the CPU 501. The HD 504 stores various data, such as programs. The HDD controller 505 controls reading or writing of various data of the HD 504 according to the control of the CPU 501. The display 506 displays various information such as a cursor, a menu, a window, a character, or an image. The external device connection I / F 508 is an interface for connecting various external devices. The external device in this case is, for example, a USB (Universal Serial Bus) memory or a printer, or the like. The network I / F 509 is an interface for data communication using the network N. The bus 510 is a bus for electrically connecting Figure 3 the addresses of the CPU 501 and the like, or a data bus, or the like.

[0043] Further, the keyboard 511 is an input means provided with a plurality of keys for inputting characters, numerical values, or various instructions, and the like. The pointing device 512 is an input means for performing selection or execution of various instructions, selection of a processing target, movement of a cursor, and the like. The DVD-RW drive 514 controls reading or writing of various data to or from the DVD-RW 513, which is an example of a detachable recording medium. Note that the DVD-RW drive 514 is not limited to the DVD-RW, and can be a DVD-R or the like. The medium I / F 516 controls reading or writing (storage) of data to or from the recording medium 515, such as a flash memory.

[0044] <About the Function> Next, the functional configuration of the CO2 emission amount evaluation system 100 according to the present embodiment will be described with reference to Figure 4 Figure 4 is a diagram illustrating an example of the functional configuration of the CO2 emission amount evaluation system 100.

[0045] <<Authentication System>> The authentication system 30 has a communication section 31, an authentication processing section 32, and a storage section 33. Each functional section of the authentication system 30 is a function or means realized by the CPU 501 executing instructions included in one or more programs installed in the authentication system 30. Figure 3

[0046] The communication section 31 transmits and receives various information with the CO2 emission amount evaluation device 10. The communication section 31 receives a request from the CO2 emission amount evaluation device 10, or transmits authentication information to the CO2 emission amount evaluation device 10. The authentication information includes, for example, a REC and an electronic signature, and the like.

[0047] The authentication processing section 32 authenticates authentication target information transmitted from the CO2 emission amount evaluation device. The authentication processing section 32 performs, for example, the following authentication.

[0048] The authentication processing section 32 authenticates the carbon intensity, the evaluation result based on whether the carbon intensity can be called CO2-free, the hydrogen-specific information A for specifying hydrogen (manufacturing site, manufacturing period, manufacturing amount, CO2 emission amount, and the like), and the process name (at the time of hydrogen manufacturing). The standard of authentication can depend on whether the requirements of the first party are satisfied.

[0049] The authentication processing section 32 authenticates the carbon intensity, the evaluation result based on whether the carbon intensity can be called CO2-free, the hydrogen-specific information B for specifying hydrogen (extraction site, extraction period, extraction amount, CO2 emission amount, and the like), and the process name (at the time of hydrogen extraction).

[0050] The processing of authentication will be described in detail in Figure 5 ​​The details will be described later. The storage section 33 stores various authentication information created by the authentication processing section 32.

[0051] <<Factory system>> The factory system 40 has a communication section 41, a manufacturing management section 42, an extraction management section 43, and a simulation section 44. Each functional section of the factory system 40 is a function or means realized by the CPU 501 shown in Fig. 1 executing instructions included in one or more programs installed in the factory system 40. Figure 3

[0052] The communication section 41 transmits and receives various information with the CO2 emission amount evaluation device 10. The communication section 41 transmits, to the CO2 emission amount evaluation device 10, manufacturing sites, manufacturing time periods, manufacturing amounts (extraction amounts), CO2 emission amounts, and process names, and the like.

[0053] The manufacturing management section 42 creates manufacturing sites, manufacturing time periods, manufacturing amounts, CO2 emission amounts, and process names, and the like at the time of hydrogen manufacturing.

[0054] The extraction management section 43 creates extraction sites, extraction time periods, extraction amounts, CO2 emission amounts, and process names, and the like at the time of hydrogen extraction.

[0055] The simulation section 44 is a simulator that estimates the amount of extracted hydrogen based on the raw material composition of the hydrogen carrier and the operating conditions at the time of hydrogen extraction. Therefore, even if CO2-free hydrogen is mixed with hydrogen of the existing process, the extraction amount of the CO2-free hydrogen can be estimated as long as the raw material composition and the operating conditions are known.

[0056] <<CO2 emission amount evaluation device>> The CO2 emission amount evaluation device 10 has a communication section 11, a carbon intensity calculation section 12, an authentication information acquisition section 13, a provision section 14, a reduction amount calculation section 15, a power generation amount calculation section 16, an incentive calculation section 17, and a storage section 18. Each functional section of the CO2 emission amount evaluation device 10 is a function or means realized by the CPU 501 shown in Fig. 1 executing instructions included in one or more programs installed in the factory system 40. Figure 3

[0057] The communication section 11 transmits and receives various information with the authentication system 30 and the factory system 40. The communication section 11 transmits, to the authentication system 30, information of an authentication target, and receives authentication information from the authentication system 30. The communication section 11 receives, from the factory system 40, information created by the manufacturing management section 42 and the extraction management section 43.

[0058] The carbon intensity calculation section 12 calculates the CO2 emission amount of hydrogen using the respective CO2 emission amounts in the case where hydrogen is manufactured from different hydrogen sources, and in the case where hydrogen is extracted from different hydrogen carriers. Details will be described later. ​​

[0059] The authentication information acquisition section 13 requests the authentication system 30 for authentication of the carbon intensity, the evaluation result based on whether the carbon intensity can be called CO2-free, the hydrogen-specific information A or B for specifying hydrogen, and the process name (at the time of hydrogen production), and acquires the authentication information. The authentication information is stored in the storage section 18.

[0060] The provision section 14 provides the authentication information to a transaction object that needs the authentication information, such as a transaction object of a hydrogen carrier containing produced hydrogen, and a transaction object of hydrogen extracted from the hydrogen carrier.

[0061] The reduction amount calculation section 15 calculates the amount of CO2 emission and the CO2 reduction rate that can be reduced by introducing CO2-free hydrogen (i.e., using the carbon intensity) with respect to the amount of CO2 emission as a reference.

[0062] The power generation amount calculation section 16 calculates the amount of power generation that can be said to be 100% CO2-free (i.e., using the carbon intensity) by introducing CO2-free hydrogen. In addition, the power generation amount calculation section 16 also calculates the amount of CO2 emission at the time of power generation.

[0063] The incentive calculation section 17 converts the amount of CO2 reduction that can be reduced by introducing CO2-free hydrogen into an amount of money. That is, the incentive is a monetary effect due to the introduction of CO2-free hydrogen.

[0064] <Authentication System> Reference Figure 5 The authentication method performed by the authentication system 30 is described. Figure 5 is a diagram that explains the authentication method using an electronic signature. In Figure 5 , the carbon intensity, the evaluation result based on whether the carbon intensity can be called CO2-free, the hydrogen-specific information A or B, and the process name (at the time of renewable energy production, at the time of hydrogen production, at the time of hydrogen carrier production, at the time of hydrogen extraction, and the like) are taken as authentication objects.

[0065] (1) The authentication processing section 32 calculates the hash values of the carbon intensity, the evaluation result, the hydrogen-specific information A or B, and the process name.

[0066] (2) The authentication processing section 32 encrypts the hash values with the private key 53 set in advance by the CO2 emission evaluation device 10. The encrypted hash values are called electronic signatures 54.

[0067] (3) The electronic signatures 54 are attached to the electronic data 51 (carbon intensity, evaluation result, hydrogen-specific information A or B, and process name) taken as authentication objects.

[0068] (4) The authentication processing section 32 attaches the electronic certificate 52 of the authentication system 30 to the electronic data 51. The electronic certificate 52 contains the public key 52a of the CO2 emission evaluation device 10 and the electronic signature 52b of the authentication system 30. The public key 52a is paired with the private key 53, and information encrypted with the private key 53 can be decrypted only with the paired public key 52a. Further, the electronic signature 52b of the authentication system 30 is used to prove that the electronic certificate 52 is given by the authentication system 30. The electronic data 51, the electronic signature 54, and the electronic certificate 52 are the authentication information 50.

[0069] The procedure for verifying the electronic data 51 thus made and attached with the electronic signature 54 and the electronic certificate 52 is as follows (not shown). The verifier is assumed to be a transaction partner who purchases hydrogen, but anyone can authenticate.

[0070] (5) The transaction partner calculates the hash values of the carbon intensity, the evaluation result, the hydrogen-specific information A or B, and the process name.

[0071] (6) The transaction partner decrypts the electronic signature 54 attached to the electronic data 51 with the public key 52a into the original hash value.

[0072] (7) When the hash value of (5) coincides with the hash value of (6), the purchaser can judge that the electronic data 51 has not been tampered with and that the electronic data 51 is issued by the CO2 emission evaluation device 10.

[0073] In addition, the above-described authentication method is only an example, and authentication can be performed by a method other than obtaining certification from a third-party organization or the like.

[0074] <Hydrogen source, hydrogen carrier, hydrogen extraction> Referring to Figure 6 , the stage of making authentication information is described. Figure 6 is a diagram illustrating the authentication stage regarding the hydrogen source, the hydrogen carrier, and the hydrogen extraction. In Figure 6 , two hydrogen gases 71 are manufactured. First, the CO2 emission evaluation device can authenticate the carbon intensity at the time of manufacturing (A). The hydrogen carrier manufacturing facility 72 manufactures a hydrogen carrier from two hydrogen sources (the hydrogen source can be single or multiple). The hydrogen carrier is stored in the storage facility 73. As an example, the carbon intensity or the like of the hydrogen gas contained in this storage facility 73 is authenticated (B). That is, the CO2 emission evaluation device 10 causes the authentication system 30 to authenticate the carbon intensity of the hydrogen carrier (liquid hydrogen, MCH, or the like) in which hydrogen gases manufactured from one or more hydrogen sources are mixed.

[0075] The hydrogen carrier of the storage facility 73 is transported and stored in the storage facility 75 together with the hydrogen carrier of another storage facility 74. The hydrogen carrier stored in the storage facility 74 can or can not be CO2-free hydrogen. The hydrogen carrier can be one or a plurality. Hydrogen is extracted from the hydrogen carrier of the storage facility 75 by a hydrogen extraction device 76. At the time of extraction of hydrogen, the CO2 emission evaluation device 10 causes the certification system 30 to certify (C) the carbon intensity of the hydrogen extracted from the storage facility 75. In the case where the hydrogen of the hydrogen carrier stored in the storage facility 74 is not CO2-free hydrogen, the hydrogen extracted from the storage facility 75 is partly not CO2-free hydrogen and partly CO2-free hydrogen. At this time, the amount of CO2-free hydrogen extracted is calculated in accordance with the mixing ratio of the hydrogen carrier in the storage facility 75. In the case where the hydrogen of the hydrogen carrier stored in the storage facility 74 is CO2-free hydrogen, the hydrogen extracted from the storage facility 75 is all CO2-free hydrogen, but if the hydrogen source is different, the amount of CO2 reduction is also different, and therefore it is preferable to calculate the amount of CO2 reduction separately for the storage facilities 73 and 74.

[0076] The CO2 emission evaluation device 10 calculates the amount of CO2 reduction in accordance with the mixing ratio of CO2-free hydrogen to other types of hydrogen, or all of the hydrogen sources are CO2-free hydrogen but the amount of CO2 reduction is different, and calculates the amount of CO2 reduction accordingly. The CO2 emission evaluation device 10 can either convey the equivalent amount of CO2 reduction to the destination of the extracted hydrogen or convey that the hydrogen to a certain specific destination is 100% CO2-free hydrogen.

[0077] Figure 7 is a diagram illustrating a case where hydrogen extracted from a hydrogen carrier is mixed with hydrogen manufactured from other raw materials. With the same Figure 6 Similarly, a hydrogen carrier containing CO2-free hydrogen is transported and stored in a storage facility 81. Hydrogen is extracted from the hydrogen carrier of the storage facility 81 by a hydrogen extraction facility 82. After the hydrogen is extracted from the hydrogen carrier, toluene is recovered by a toluene recovery device 83 and transported to a site where CO2-free hydrogen is manufactured.

[0078] On the other hand, hydrogen is also manufactured from various raw materials within a refinery (referred to as an existing process 84), and at the time of extraction of hydrogen, the CO2-free hydrogen from the storage facility 81 is mixed with the hydrogen of the existing process. The hydrogen manufactured by the existing process 84 is not CO2-free. In this case, within the refinery, the amount of CO2 emission reduction is evaluated on the basis of the proportion of hydrogen certified as CO2-free with respect to the entire hydrogen consumption amount.

[0079] In the case where the sales company sells the manufactured hydrogen gas as CO2-free hydrogen gas to a transaction partner, the sales company considers that only CO2-free hydrogen gas is sold based on the proportion of hydrogen gas from the existing process to CO2-free hydrogen gas, and can deliver the corresponding portion of the certification to the transaction partner. In addition, in the case of in-house use, the amount of CO2-free hydrogen gas traded is subtracted from the total amount of hydrogen gas used in-house.

[0080] <Calculation Example of Carbon Intensity> Next, the calculation method of carbon intensity will be described.

[0081] (1) Carbon Intensity at the Time of Hydrogen Gas Manufacture The carbon intensity calculation section 12 calculates the carbon intensity at the time of hydrogen gas manufacture by the following procedure. In addition, it is assumed here that the CO2 emission amount at the time of hydrogen gas manufacture is zero, and the carbon intensity at the time of hydrogen carrier manufacture is sought. Furthermore, the carbon intensity calculation method of hydrogen gas in which the hydrogen source and the CO2 emission amount are different will be described. If the hydrogen source is one, the carbon intensity is the CO2 emission amount of that hydrogen source itself. In addition, the CO2 emission amount is a relative value per unit amount with respect to a hydrogen gas manufacturing method as a reference.

[0082] Hydrogen source 1: by-product hydrogen gas CO2 emission amount 1 Hydrogen source 2: water electrolysis hydrogen gas CO2 emission amount 0.1 It is assumed that hydrogen carriers are manufactured from these hydrogen gases, and the capacity ratio is "1:1".

[0083] Carbon intensity = 1 x 0.5 + 0.1 x 0.5 = 0.55 …… (1) If the threshold value at which it can be judged that there is no CO2 is set to, for example, 0.6, the overall hydrogen gas can be evaluated as CO2-free because it is less than the threshold value. By certifying the carbon intensity and the evaluation result with respect to the manufactured hydrogen gas, it is possible to track whether the hydrogen source can be considered to be CO2-free at the time of hydrogen carrier transaction. In addition, the value of the hydrogen gas can also be determined by agreement between the transaction parties.

[0084] (2) Carbon Intensity at the Time of Hydrogen Gas Extraction The carbon intensity calculation section 12 calculates the carbon intensity at the time of hydrogen gas extraction by the following procedure. The carbon intensity calculation method of hydrogen gas at the time of extraction in a hydrogen carrier in which the hydrogen carrier and the CO2 emission amount at the time of extraction are different will be described. If the hydrogen carrier is one, the carbon intensity is the CO2 emission amount at the time of extraction of hydrogen gas from that hydrogen carrier itself.

[0085] Hydrogen carrier 1: hydrogen gas derived from CO2-free MCH produced in Australia CO2 emission amount 0.1 Hydrogen carrier 2: hydrogen gas derived from CO2-free MCH produced in the Middle East CO2 emission amount 0.5 It is assumed that hydrogen gas is extracted from these hydrogen carriers, and the capacity ratio is "1:1".

[0086] Carbon intensity = 0.1 x 0.5 + 0.5 x 0.5 = 0.30 …… (2) If the threshold value of the carbon intensity that can be judged as CO2-free is set to, for example, 0.6, the overall hydrogen gas can be evaluated as CO2-free because it is less than the threshold value. By authenticating the carbon intensity and the evaluation result in correspondence with the extracted hydrogen gas, it is possible to track whether the hydrogen gas can be considered as CO2-free at the time of hydrogen gas transaction or use. In addition, the value of the hydrogen gas can also be determined by agreement between the transaction parties.

[0087] Alternatively, the total CO2 emission amount can also be calculated, and based on the total CO2 emission amount until the time of hydrogen gas use, how much CO2 emission amount has been reduced overall can be evaluated. In addition, the value of the hydrogen gas can also be determined by agreement between the transaction parties.

[0088] <Calculation of reduction amount of CO2 emission> Next, the calculation method of the reduction amount of CO2 emission will be described. The CO2 emission evaluation device 10 can also include the reduction amount of CO2 emission in the authentication object.

[0089] (1) In the case of self-consumption at the refinery The calculation method of the reduction amount of CO2 emission for the CO2-free hydrogen gas for which the carbon intensity has been calculated is as follows. In addition, "t-CO2" means the amount of carbon dioxide in tons, and "t-H2" means the amount of hydrogen gas in tons.

[0090] CO2 emission amount of CO2-free hydrogen gas (t-CO2) = Carbon intensity (t-CO2 / t-H2) x CO2-free hydrogen gas amount (t-H2) …… (3) CO2 emission amount of CO2-free hydrogen gas (t-CO2) = Carbon intensity (t-CO2 / t-H2) x CO2-free hydrogen gas amount (t-H2) …… (3) CO2 reduction amount (t-CO2) = CO2 emission amount before replacement with CO2-free hydrogen gas (t-CO2) - {CO2 emission amount from refinery hydrogen gas (t-CO2) + CO2 emission amount of CO2-free hydrogen gas (t-CO2)} …… (4) CO2 reduction amount (t-CO2) = CO2 emission amount before replacement with CO2-free hydrogen gas (t-CO2) - {CO2 emission amount from refinery hydrogen gas (t-CO2) + CO2 emission amount of CO2-free hydrogen gas (t-CO2)} …… (4) CO2 reduction rate (%) = {CO2 emission amount from refinery hydrogen gas (t-CO2) + CO2 emission amount of CO2-free hydrogen gas (t-CO2)} / CO2 emission amount before replacement with CO2-free hydrogen gas (t-CO2) …… (5) CO2 reduction rate (%) = {CO2 emission amount from refinery hydrogen gas (t-CO2) + CO2 emission amount of CO2-free hydrogen gas (t-CO2)} / CO2 emission amount before replacement with CO2-free hydrogen gas (t-CO2) …… (5) In addition, if the reference CO2 emission amount used for calculating the carbon intensity is the CO2 emission amount at the time of manufacturing of the hydrogen gas manufactured at the refinery, the CO2 reduction rate can be calculated as follows.

[0091] CO2 reduction rate (%) = (CO2 emission amount before replacement with CO2-free hydrogen - CO2 emission amount (t-CO2) after replacement with CO2-free hydrogen) / CO2 emission amount (t-CO2) before replacement with CO2-free hydrogen …… (6) (2) Use of hydrogen in self-generation in oil refineries and the like The reduction amount calculating section 15 calculates the reduction amount of the CO2 emission amount when using the CO2-free hydrogen for which the carbon intensity has been calculated, by the following method.

[0092] CO2 emission amount at the time of power generation (t-CO2 / MWh) = CO2 emission amount (t-CO2 / MWh) before replacement with CO2-free hydrogen - CO2 emission amount (t-CO2 / MWh) after replacement with CO2-free hydrogen …… (7) CO2 emission amount at the time of power generation (t-CO2 / MWh) = CO2 emission amount (t-CO2 / MWh) before replacement with CO2-free hydrogen - CO2 emission amount (t-CO2 / MWh) after replacement with CO2-free hydrogen …… (7) At the time of power selling, the difference between the CO2 emission amount after the introduction and the CO2 emission amount with respect to the total power generation amount before the introduction is the reduction amount of the CO2 emission amount. In addition, the introduction means that the CO2-free hydrogen has been introduced as a power generation fuel.

[0093] In addition, the power generation amount calculating section 16 calculates the power generation amount by the CO2-free hydrogen power generation in the case of using the CO2-free hydrogen for which the carbon intensity has been calculated for power generation. The CO2 emission amount evaluating device 10 can also include the power generation amount by the CO2-free hydrogen power generation in the certification target.

[0094] 100% CO2-free power generation amount (MWh) = total power generation amount (MWh) x {CO2 emission amount (t-CO2 / MWh) before introduction - CO2 emission amount (t-CO2 / MWh) after introduction} / CO2 emission amount (t-CO2 / MWh) before introduction …… (8) 100% CO2-free power generation amount (MWh) = total power generation amount (MWh) x {CO2 emission amount (t-CO2 / MWh) before introduction - CO2 emission amount (t-CO2 / MWh) after introduction} / CO2 emission amount (t-CO2 / MWh) before introduction …… (8) The oil refinery sells the power at the time of power selling, saying “this is the power of carbon intensity ○○%”. Alternatively, the oil refinery sells only the 100% CO2-free power generation amount (MWh) calculated by the formula (8) as “100% CO2-free power”.

[0095] <Method of calculating incentives> The incentive calculating section 17 calculates an incentive (CO2-free incentive) in accordance with the CO2 reduction amount. The unit of the incentive can be an amount of money (for example, Japanese yen, US dollars, euros, and the like). The incentive calculating section 17 can also include the incentive in the certification target.

[0096] The method of calculating the CO2-free incentive in accordance with the hydrogen manufactured or supplied is as follows.

[0097] CO2 reduction amount (t-CO2) = (1 - carbon intensity) x CO2 emission amount of hydrogen as a reference (t-CO2) at the time of manufacturing or extraction … (9) CO2 incentive (yen) = CO2 reduction amount (t-CO2) x CO2 price (yen / t-CO2) <Calculate the amount of hydrogen extraction by simulation> Figure 8 is a flowchart illustrating a flow of the hydrogen extraction amount calculated by the simulation unit 44. The calculation of the hydrogen extraction amount by simulation is as shown in Figure 7 the hydrogen extracted from the hydrogen carrier is mixed with the hydrogen manufactured from the raw material, and the like is effective.

[0098] The simulation unit 44 analyzes the raw material composition in the tank (S501). It is assumed that the raw material composition in the tank is known.

[0099] The simulation unit 44 calculates the amount of hydrogen manufactured corresponding to the raw material composition and the operation condition (S502). How much hydrogen is manufactured from the raw material composition and the operation condition is estimated by a database or an estimation model generated by machine learning.

[0100] The simulation unit 44 calculates the amount of hydrogen manufactured from the existing process and the amount of CO2-free hydrogen extracted from the MCH (S503). How much hydrogen is manufactured from the existing process and the MCH from the raw material composition and the operation condition is estimated by a database or an estimation model generated by machine learning.

[0101] <Flow of hydrogen manufacturing, hydrogen extraction, and certification> Figure 9 is a flowchart illustrating the overall flow of the processes performed by the certification system 30, the CO2 emission amount evaluation device 10, and the factory system 40.

[0102] S1: First, the factory system 40 manufactures renewable energy (solar power, water power, wind power, and the like). The factory system 40 transmits information required for the calculation of the emission factor of the renewable energy manufacturing site, the manufacturing period, the manufacturing amount, and the like to the CO2 emission amount evaluation device 10. The information required for the calculation of the emission factor refers to fuel or power consumed in the renewable energy manufacturing.

[0103] S2: The CO2 emission amount evaluation device 10 calculates the emission factor (CO2 emission amount with respect to a reference) using information required for the emission factor calculation (carbon intensity calculation). The emission factor corresponds to the carbon intensity. The CO2 emission amount evaluation device 10 transmits the manufacturing site of the renewable energy, the manufacturing period, the manufacturing amount, and the carbon intensity to the certification system 30. In the case where the manufactured hydrogen is not CO2-free hydrogen (not clean hydrogen), the CO2 emission amount of the hydrogen production upstream (thermal power generation or the like) can also be included in the carbon intensity.

[0104] S3: The certification system 30 registers the manufacturing site of the renewable energy, the manufacturing period, the manufacturing amount, and the carbon intensity in correspondence.

[0105] S4: The certification system 30 certifies the manufacturing site of the renewable energy, the manufacturing period, the manufacturing amount, and the carbon intensity, and creates certification information. The certification information is disclosed. The certification system 30 transmits the certification information to the CO2 emission amount evaluation device 10.

[0106] S5: The CO2 emission amount evaluation device 10 registers the certification information on the renewable energy production.

[0107] S6: Next, the factory system 40 consumes the renewable energy to produce hydrogen. The factory system 40 transmits information required for the emission factor calculation to the CO2 emission amount evaluation device 10. The information required for the emission factor calculation refers to fuel or electric power consumed in the hydrogen production.

[0108] S7: The CO2 emission amount evaluation device 10 calculates the emission factor (CO2 emission amount with respect to a reference) using information required for the emission factor calculation. The emission factor corresponds to the carbon intensity. In addition, the CO2 emission amount evaluation device 10 also compares the emission factor with a threshold value, and performs evaluation on whether or not it can be regarded as CO2-free hydrogen. The CO2 emission amount evaluation device 10 transmits the hydrogen-specific information A, the process name (at the time of hydrogen production), the carbon intensity, and the evaluation result to the certification system 30.

[0109] S8: The certification system 30 registers the hydrogen-specific information A, the process name (at the time of hydrogen production), the carbon intensity, and the evaluation result.

[0110] S9: The certification system 30 certifies the hydrogen-specific information A, the process name (at the time of hydrogen production), the carbon intensity, and the evaluation result, and creates certification information. The certification information is disclosed. The certification information is sometimes referred to as a clean hydrogen issuance document. The certification system 30 transmits the certification information to the CO2 emission amount evaluation device 10.

[0111] S10: The CO2 emission amount evaluation device 10 registers the certification information at the time of hydrogen production.

[0112] S11: Next, the factory system 40 converts hydrogen into a hydrogen carrier (MCH, liquid hydrogen, etc.). The factory system 40 transmits information required for calculation of the emission factor of the hydrogen carrier to the CO2 emission amount evaluation device 10. The information required for calculation of the emission factor refers to the CO2 emission amount at the time of manufacture of fuel or electricity consumed in the manufacture of the hydrogen carrier, and the CO2 emission amount generated due to these consumptions.

[0113] S12: The carbon intensity calculation section of the CO2 emission amount evaluation device 10 calculates the emission factor (CO2 emission amount with respect to the reference) using the information required for calculation of the emission factor. The emission factor corresponds to the carbon intensity. The CO2 emission amount evaluation device 10 registers the certification information regarding the manufacture of the hydrogen carrier.

[0114] S13: The hydrogen carrier manufactured in the factory system 40 is transported to a transaction object or the like. The factory system 40 transmits information required for calculation of the emission factor of the hydrogen carrier to the CO2 emission amount evaluation device 10. The information required for calculation of the emission factor refers to the CO2 emission amount at the time of manufacture of fuel or electricity consumed in the transport, and the CO2 emission amount generated due to these consumptions.

[0115] S14: The carbon intensity calculation section of the CO2 emission amount evaluation device 10 calculates the emission factor (CO2 emission amount with respect to the reference) using the information required for calculation of the emission factor. The emission factor corresponds to the carbon intensity. The CO2 emission amount evaluation device 10 registers the certification information regarding the transport of the hydrogen carrier.

[0116] S15: The factory system 40 extracts hydrogen from the hydrogen carrier. The factory system 40 transmits information required for calculation of the emission factor of the extraction of hydrogen to the CO2 emission amount evaluation device 10. The information required for calculation of the emission factor refers to the CO2 emission amount at the time of manufacture of fuel or electricity consumed in the extraction of hydrogen, and the CO2 emission amount generated due to these consumptions.

[0117] S16: The CO2 emission amount evaluation device 10 calculates the emission factor (CO2 emission amount with respect to the reference) using the information required for calculation of the emission factor. The emission factor corresponds to the carbon intensity. Further, the CO2 emission amount evaluation device 10 compares the emission factor with a threshold value, and performs evaluation of whether or not it can be regarded as CO2-free hydrogen. The CO2 emission amount evaluation device 10 transmits the hydrogen-specific information B, the process name (at the time of extraction of hydrogen), the carbon intensity, and the evaluation result to the certification system 30.

[0118] Further, in step S16, the CO2 emission amount evaluation device 10 can request the authentication system 30 for the authentication of the CO2 emission amount at the time of conversion into a hydrogen carrier and the CO2 emission amount at the time of transportation, respectively, or can request the authentication system 30 for the authentication of the CO2 emission amount at the time of conversion into a hydrogen carrier, the CO2 emission amount at the time of transportation, and the CO2 emission amount at the time of extraction together.

[0119] S17: The authentication system 30 registers the hydrogen-specific information B, the process name (at the time of hydrogen extraction), the carbon intensity, and the evaluation result.

[0120] S18: The authentication system 30 authenticates the hydrogen-specific information B, the process name (at the time of hydrogen extraction), the carbon intensity, and the evaluation result, and creates authentication information. The authentication information is disclosed. The authentication information is sometimes referred to as a clean hydrogen certificate. The authentication system 30 transmits the authentication information to the CO2 emission amount evaluation device 10.

[0121] S19: The CO2 emission amount evaluation device 10 registers the authentication information regarding the time of hydrogen extraction.

[0122] Further, in Figure 9 , the CO2 emission amounts generated in each of the stages of the production of a renewable energy source, the production of hydrogen, the conversion into a hydrogen carrier, the transportation, and the extraction are authenticated. However, the CO2 emission amounts up to each of the stages can be calculated, and the CO2 emission amounts including the CO2 emission amounts of the previous stages can be authenticated.

[0123] <Several utilization examples of the calculation and authentication of carbon intensity> Figure 10 is a flowchart illustrating a procedure of the calculation and authentication of carbon intensity in a case where the hydrogen source is one.

[0124] The factory system 40 produces CO2-free hydrogen, and calculates the CO2 emission amount at the time of production (S101). The communication section 41 of the factory system 40 transmits the production site, the production period, the production amount, and the CO2 emission amount to the CO2 emission amount evaluation device 10. Here, it is assumed that the factory system 40 calculates the CO2 emission amount for the sake of simplicity.

[0125] The carbon intensity calculation section 12 of the CO2 emission amount evaluation device 10 calculates a relative value of the CO2 emission amount at the time of production with respect to the CO2 emission amount of hydrogen as a reference as the carbon intensity (S102). For example, the carbon intensity calculation section 12 takes the ratio of the CO2 emission amount of step S101 with respect to the CO2 emission amount of hydrogen as a reference as the carbon intensity. The carbon intensity calculation section 12 compares the threshold value with the carbon intensity to determine the evaluation result.

[0126] The authentication information acquisition section 13 of the CO2 emission amount evaluation device 10 transmits the authentication objects (carbon intensity, evaluation result based on carbon intensity whether or not it can be called CO2-free, hydrogen-specific information A, and process name) to the authentication system 30 via the communication section 11. The authentication processing section 32 of the authentication system 30 authenticates the authentication objects and creates authentication information (S103). The communication section 31 of the authentication system 30 transmits the authentication information to the CO2 emission amount evaluation device 10. The authentication information acquisition section 13 acquires the authentication information. The hydrogen carrier selling company receives the hydrogen carrier and manages it together with the authentication information. In this case, the hydrogen carrier selling company is the enterprise or the affiliated enterprise that manages the CO2 emission amount evaluation device 10.

[0127] Figure 10 The authentication processing at the time of hydrogen gas production is the same flow as the authentication processing at the time of hydrogen gas extraction.

[0128] Figure 11 is a flowchart illustrating the calculation of carbon intensity and the authentication flow in the case where the hydrogen source is two.

[0129] The factory system 40 produces byproduct hydrogen gas and CO2-free hydrogen gas, further produces a hydrogen carrier, and calculates the CO2 emission amount at each production (S201). The communication section 41 of the factory system 40 transmits the respective production sites, production periods, production amounts, and CO2 emission amounts to the CO2 emission amount evaluation device 10.

[0130] The carbon intensity calculation section 12 of the CO2 emission amount evaluation device 10 calculates the carbon intensity based on the mixing ratio of hydrogen gas in which the hydrogen source is different and the relative value of the CO2 emission amount of step S201 to the CO2 emission amount of hydrogen gas as a reference (S202). The calculation method of this carbon intensity is shown in Expression (1). The carbon intensity calculation section 12 compares the threshold value with the carbon intensity to determine the evaluation result.

[0131] The authentication information acquisition section 13 of the CO2 emission amount evaluation device 10 transmits the authentication objects (carbon intensity, evaluation result based on carbon intensity whether or not it can be called CO2-free, hydrogen-specific information A, and process name) to the authentication system 30 via the communication section 11. The authentication processing section 32 of the authentication system 30 authenticates the authentication objects and creates authentication information (S203). The communication section 31 of the authentication system 30 transmits the authentication information to the CO2 emission amount evaluation device 10. The authentication information acquisition section 13 acquires the authentication information. The hydrogen gas selling company receives the hydrogen carrier and manages it together with the authentication information.

[0132] Figure 12 is a flowchart illustrating the calculation of carbon intensity and the authentication flow in the case where the hydrogen carrier is two. In addition, in the explanation of Figure 12 , the differences from Figure 10 are mainly explained. Figure 12Steps S301 to S303 of FIG. 10 can be the same as Figure 11 Steps S201 to S203 of FIG. 8.

[0133] The hydrogen selling company extracts hydrogen and sells it to a transaction partner. In the case where hydrogen carriers of a plurality of supply sources are mixedly used (refer to Figure 6 When hydrogen is extracted, the reduction amount calculating section 15 calculates the CO2 emission amount from the authentication information and totals the CO2 emission amounts at the time of hydrogen production for the plurality of hydrogen carriers (S304).

[0134] Therefore, the reduction amount calculating section 15 substitutes the carbon intensity included in the authentication information and the CO2-free hydrogen amount extracted from the hydrogen carrier (assuming that the same hydrogen carrier including CO2-free hydrogen such as MCH is mixed) into Equation (3) to calculate the CO2 emission amount. Since there are a plurality of authentication information when there are a plurality of hydrogen carriers, the reduction amount calculating section 15 calculates the CO2 emission amount for each hydrogen carrier. The CO2 emission amount of hydrogen as a basis of Equation (3) is known.

[0135] Further, the communication section 11 receives the CO2 emission amount at the time of hydrogen extraction from the factory system 40, and the reduction amount calculating section 15 totals the CO2 emission amount at the time of hydrogen extraction and the CO2 emission amount calculated in step S404. The authentication information acquiring section 13 of the CO2 emission evaluation device 10 can authenticate the CO2 emission amount from production to extraction calculated in step S404 in the authentication system 30. Further, the providing section 14 can provide the authentication information to the transaction partner.

[0136] Thus, even when hydrogen is extracted from a plurality of hydrogen carriers, the CO2 emission amount can be calculated from the authenticated carbon intensity.

[0137] Figure 13 is a flowchart illustrating a calculation and authentication procedure of carbon intensity in the case where hydrogen is extracted from a hydrogen carrier and hydrogen is produced using an existing process. In addition, in the explanation of Figure 13 the differences from Figure 10 are mainly explained. Figure 13 Steps S401 to S403 of FIG. 12 can be the same as Figure 11 Steps S201 to S203 of FIG. 8.

[0138] The hydrogen selling company extracts hydrogen and sells it to a transaction partner. In the case where hydrogen is produced not only from MCH but also from an existing process (refer to Figure 7), the simulation section 44 estimates the amount of hydrogen extracted from the MCH and calculates the amount of CO2emissions based on the certified carbon intensity (S404). In the case where hydrogen is also manufactured from the existing process, since the amount of hydrogen extracted from the MCH cannot be measured, the amount of hydrogen extracted is estimated by the simulation section 44. Further, the amount of hydrogen after subtracting the amount of hydrogen calculated by the simulation section 44 from the total amount of hydrogen extracted is the amount of hydrogen of the existing process.

[0139] The reduction amount calculation section 15 substitutes the carbon intensity included in the certification information and the CO2-free hydrogen amount estimated by the simulation section 44 into Equation (3) to calculate the amount of CO2emissions at the time of manufacturing of the hydrogen included in the MCH.

[0140] Next, the carbon intensity calculation section 12 calculates the carbon intensity of the total hydrogen amount based on the amount of CO2emissions accompanying the hydrogen extracted from the existing process and the amount of CO2emissions of step S404 (S405). The communication section 11 acquires the amount of hydrogen extracted from the existing process and the amount of CO2emissions from the plant system 40. Further, the communication section 11 also acquires the amount of hydrogen extracted from the MCH (calculated by simulation) and the amount of CO2emissions at the time of extraction of hydrogen from the plant system 40. This is to total the amount of CO2emissions at the time of manufacturing of the hydrogen included in the MCH and the amount of CO2emissions at the time of extraction of hydrogen from the MCH. The carbon intensity calculation section 12 can calculate the carbon intensity by Equation (2).

[0141] Further, the certification information acquisition section 13 of the CO2emissions evaluation device 10 transmits the certification target (carbon intensity, evaluation result based on whether the carbon intensity can be called CO2-free, hydrogen-specific information B, and process name) to the certification system 30 and acquires the certification information at the time of extraction of hydrogen. Further, the provision section 14 can provide the certification information to a transaction target.

[0142] In addition, in the case where there are multiple destinations of hydrogen, it can be evaluated that only the hydrogen of a specific destination among the total hydrogen amount is CO2-free hydrogen, or it can be evaluated that the proportion of the amount of CO2-free hydrogen with respect to the total hydrogen amount is CO2-free hydrogen.

[0143] <Use on the refinery side when CO2-free hydrogen is supplied to the refinery (MCH)> If only the steady-state hydrogen is CO2-free hydrogen, and, for example, only 9.5 t of 10 t is used in the steady state, 0.5 t of waste is generated. There is a problem that waste is generated during the transition period from the steady state to the supply state.

[0144] Figure 14A 、 Figure 14B is a graph showing the relationship between time and the amount of hydrogen extracted. Figure 14A An increase in the amount of hydrogen extracted from the MCH is shown on the basis of hydrogen manufactured from an existing raw material.

[0145] t1: From the start of the increase in hydrogen production, stop extracting hydrogen from the MCH t2: Until the hydrogen returns to the usual amount, produce CO2-free hydrogen (cumulative amount of CO2-free hydrogen with a flow meter for supply to other companies) Figure 14B A case in which the production rate of hydrogen manufactured from existing raw materials is reduced to make room (free) for hydrogen extracted from the MCH is shown.

[0146] t1: When starting to extract hydrogen from the MCH, wait for a predetermined time lag to pass t2: From the start of the feed + the time lag to the stop of the feed + the time lag, produce CO2-free hydrogen (for supply to other companies) In addition, in Figure 14B , the cumulative amount of CO2-free hydrogen based on the simulator is calculated. The CO2 emission amount evaluation device 10 can supply hydrogen corresponding to the carbon intensity calculated above to other companies.

[0147] <Main effects> In the present embodiment, since the hydrogen traded is associated with the carbon intensity and has been certified, even hydrogen manufactured overseas or in remote areas can achieve a fair trade that reflects the value corresponding to the carbon intensity.

[0148] This application claims priority based on Japanese Patent Application No. 2023-106802 filed on June 29, 2023, in the Japan Patent Office, and incorporates the entire contents of Japanese Patent Application No. 2023-106802 into the present application.

[0149]

Explanation of symbols

Claims

1. A CO2eq emission assessment device that communicates via a network with plant systems and certification systems involved in hydrogen production, said CO2eq emission assessment device having: The communications unit receives information from the plant system regarding CO2 emissions during hydrogen production and the hydrogen-specific characteristics of the produced hydrogen. The authentication information acquisition unit requests authentication of the CO2 emissions associated with the hydrogen-specific information from the authentication system, and acquires authentication information of the CO2 emissions associated with the hydrogen-specific information.

2. The CO2eq emission assessment device according to claim 1, wherein the communication unit receives from the plant system CO2 emissions during hydrogen extraction from the hydrogen carrier and hydrogen-specific information of the extracted hydrogen. The authentication information acquisition unit requests authentication of the CO2 emissions during hydrogen extraction and specific hydrogen information from the authentication system, and acquires authentication information of the CO2 emissions during hydrogen extraction and specific hydrogen information. The CO2eq emission assessment device has a providing unit that provides the certification information to the trading parties of the extracted hydrogen.

3. The CO2eq emission assessment device according to claim 2, wherein the communication unit receives CO2 emissions during hydrogen production and hydrogen-specific information of the produced hydrogen from multiple said plant systems. The CO2eq emission assessment device includes a carbon intensity calculation unit that calculates carbon intensity based on the CO2 emissions from multiple plant systems and the hydrogen content contained in the hydrogen-specific information. This carbon intensity can be used to calculate the CO2 emissions emitted by the multiple plant systems during hydrogen production. The authentication information acquisition unit requests authentication of the carbon intensity and hydrogen-specific information from the authentication system, and acquires the authentication information of the carbon intensity and hydrogen-specific information. The providing unit provides the authentication information to the trading parties that include the manufactured hydrogen carrier.

4. The CO2eq emission assessment device according to claim 2 or 3, wherein the communication unit receives from multiple plant systems CO2 emissions during hydrogen extraction from a hydrogen carrier and hydrogen-specific information of the extracted hydrogen. The CO2eq emission assessment device has a carbon intensity calculation unit that calculates carbon intensity based on the CO2 emissions from multiple plant systems and the hydrogen content contained in the hydrogen-specific information. This carbon intensity can be used to calculate the CO2 emissions from the multiple plant systems during hydrogen extraction. The authentication information acquisition unit requests authentication of the carbon intensity and hydrogen-specific information from the authentication system, and acquires the authentication information of the carbon intensity and hydrogen-specific information. The providing unit will provide the authentication information to the trading parties of the extracted hydrogen.

5. The CO2eq emission assessment device according to claim 3, wherein, in addition to the carbon intensity and the hydrogen-specific information, the certification information acquisition unit also requests certification from the certification system for the assessment result comparing the carbon intensity with a threshold, and acquires certification information of the carbon intensity, the hydrogen-specific information, and the assessment result. The providing unit will provide the authentication information to the trading parties of the extracted hydrogen.

6. The CO2eq emission assessment device according to claim 4, wherein the carbon intensity calculation unit calculates the CO2 emissions of the extracted hydrogen during manufacturing based on the carbon intensity contained in the certification information and the amount of CO2-free hydrogen extracted from the hydrogen carrier obtained from the plant system.

7. The CO2eq emission assessment apparatus according to claim 3, wherein the plant system extracts hydrogen from the hydrogen carrier and manufactures hydrogen using existing processes, The carbon intensity calculation unit calculates the CO2 emissions of the extracted hydrogen during manufacturing based on the carbon intensity contained in the certification information and the amount of CO2-free hydrogen extracted from the hydrogen carrier calculated by the simulation unit.

8. The CO2eq emission assessment device according to claim 7, wherein the communication unit receives from the plant system the amount of hydrogen extracted from the hydrogen carrier and the CO2 emissions during extraction, as well as the amount of hydrogen extracted and the CO2 emissions through the existing process. The carbon intensity calculation unit calculates the carbon intensity based on the CO2 emissions during hydrogen extraction, which includes the total CO2 emissions during hydrogen production, the amount of hydrogen extracted from the hydrogen carrier, and the amount of hydrogen and CO2 emissions extracted using the existing process. The authentication information acquisition unit requests authentication of the carbon intensity and hydrogen-specific information of the total extracted hydrogen from the authentication system, and acquires the authentication information of the carbon intensity and the hydrogen-specific information. The providing unit will provide the authentication information to the trading parties of the extracted hydrogen.

9. The CO2eq emission assessment device according to claim 3, comprising a power generation calculation unit, Calculate the CO2 emissions when generating electricity using hydrogen extracted from a hydrogen carrier, based on the amount of CO2-free hydrogen used in power generation, the certified carbon intensity, and the amount of electricity generated. Calculate the power generation without CO2 hydrogen based on the total power generation, CO2 emissions before the introduction of CO2 hydrogen, and CO2 emissions after the introduction of CO2 hydrogen.

10. The CO2eq emission assessment device according to claim 3, comprising an excitation calculation unit, Based on the CO2 emissions from hydrogen-powered electricity as a baseline, and the certified carbon intensity, calculate the CO2 emission reductions during hydrogen production or extraction. The CO2 emission reductions will be converted into monetary amounts based on CO2 prices.

11. The CO2eq emission assessment device according to claim 3, wherein the communication unit receives information from the plant system required for carbon intensity calculation, including the CO2 emissions during the manufacturing of the hydrogen carrier from the fuel or electricity consumed, and the CO2 emissions generated through these consumptions. The carbon strength calculation unit uses the information required for the carbon strength calculation to calculate the carbon strength in the manufacturing of the hydrogen carrier.

12. The CO2eq emission assessment apparatus according to claim 3, wherein the communication unit receives information from the plant system required for carbon intensity calculation, including the CO2 emissions during manufacturing of fuel or electricity consumed in the transportation of the hydrogen carrier, and the CO2 emissions generated through these consumptions. The carbon intensity calculation unit uses the information required for the carbon intensity calculation to calculate the carbon intensity during the transport of the hydrogen carrier.

13. A CO2eq emission assessment system, wherein, The plant systems and certification systems involved in hydrogen production communicate with the CO2eq emissions assessment device via a network. The plant system sends the CO2 emissions during hydrogen production and hydrogen-specific information about the produced hydrogen to the CO2eq emission assessment device. The CO2eq emission assessment device has the following features: The communications unit receives information from the plant system regarding CO2 emissions during hydrogen production and the hydrogen-specific characteristics of the produced hydrogen. The authentication information acquisition unit requests authentication of the CO2 emissions associated with the hydrogen-specific information from the authentication system and acquires authentication information of the CO2 emissions associated with the hydrogen-specific information.

14. A CO2eq emission assessment method, which is carried out by a CO2eq emission assessment device communicating via a network with a plant system and certification system involved in hydrogen production, the method comprising the following processing: Receive CO2 emissions during hydrogen production and hydrogen-specific information about the produced hydrogen from the plant system, and The system requests certification of the CO2 emissions associated with the hydrogen-specific information from the certification system and obtains certification information of the CO2 emissions associated with the hydrogen-specific information.

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