Carbon dioxide emission computing system, method therefor, and program therefor

Abstract

To provide a carbon dioxide emission computing system, a method therefor, and a program therefor with which it is possible to manage a CO2 emission associated with purchased raw materials and a CO2 emission associated with recycled raw materials separately for each other.SOLUTION: The present invention pertains to a carbon dioxide emission computing system for determining a CO2 emission related to a product of interest having been manufactured in a prescribed period in a factory where a product manufactured from a raw material through a plurality of processes is manufacturable in a plurality of types. The raw material includes a purchased raw material, and a recycled raw material generated in the processes executed and recycled from the difference between the raw material quantity and the product quantity. The present invention determines a first quantity derived from the purchased raw material and a second quantity derived from the recycled raw material out of the product quantity of the product of interest, determines a third quantity derived from the purchased raw material and a fourth quantity derived from the recycled raw material out of the difference in the product of interest between the raw material quantity used for the manufacture of the product of interest and the product quantity of the product of interest, and multiplies a respective unit CO2 emission to each of the first to the fourth quantities, thereby determining the first to the fourth CO2 emissions, respectively.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a carbon dioxide emission calculation program for determining the amount of carbon dioxide emitted from a product manufactured through a plurality of processes. [Background technology]

[0002] In recent years, carbon dioxide emissions (CO2 emissions) have been attracting attention from the viewpoint of preserving the global environment, etc. Such technology relating to CO2 emissions is disclosed in Patent Document 1, for example.

[0003] The greenhouse gas emission calculation device disclosed in Patent Document 1 includes a material-specific emission calculation unit that calculates material-specific greenhouse gas emissions corresponding to a specific unit quantity of a material used in the manufacture of a commercial product based on standard values ​​of greenhouse gas emissions for each material; a process-specific emission calculation unit that calculates process-specific greenhouse gas emissions corresponding to a specific unit quantity of a material processed through a specific process based on process-specific unit emission information indicating greenhouse gas emissions corresponding to the process in which the specific unit quantity of the material is processed; and a commodity-specific emission calculation unit that calculates commodity-specific emissions corresponding to the commercial product manufactured from the material through the process based on the material-specific emissions calculated by the material-specific emission calculation unit and the process-specific emissions calculated by the process-specific emission calculation unit. When the material to be calculated contains multiple materials as components, the material-specific emission calculation unit calculates the material-specific emissions based on the standard values ​​of greenhouse gas emissions for each of the multiple materials. Paragraph

[0015] of Patent Document 1 states, "Defective processed products generated in each process PR are subject to disposal." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-87405 Summary of the Invention [Problem to be solved by the invention]

[0005] When a product is manufactured from raw materials through multiple processes, depending on the processing content (processing content) of the process, a difference (process difference) may occur between the amount of input (input amount) into the process and the amount of output (output amount) that passes through the process. This may result in a difference (product difference) between the amount of raw material (raw material amount) and the amount of product (product amount). Here, the process difference is referred to as "factory scrap," and this scrap may be recycled into raw materials. In particular, in the case of metal-based materials, where raw materials are melted to manufacture products, scrap can be reused. In such cases, the raw materials include raw materials procured from outside (purchased raw materials) and recycled raw materials that have been recycled from scrap. For this reason, there is a demand for separate management of CO2 emissions related to purchased raw materials and recycled raw materials.

[0006] The greenhouse gas emission calculation device disclosed in Patent Document 1 can calculate material-related emissions even when the material to be calculated contains multiple materials as components. However, since defective processed products are discarded, the multiple materials do not include recycled raw materials, and the greenhouse gas emission calculation device disclosed in Patent Document 1 cannot calculate CO2 emissions related to recycled raw materials.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a carbon dioxide emission calculation program that can manage CO2 emissions related to purchased raw materials and CO2 emissions related to recycled raw materials separately. [Means for solving the problem]

[0008] After extensive investigation, the inventors have found that the above object can be achieved by the present invention described below. That is, a carbon dioxide emission calculation system according to one aspect of the present invention is a system for calculating CO2 emissions for target products manufactured during a predetermined period in a factory capable of manufacturing a plurality of types of products from materials through a plurality of processes, wherein the materials include purchased raw materials and recycled raw materials obtained by recycling a difference between the amount of material and the amount of product generated in the execution of the processes into raw materials, and the system includes a product component amount calculation unit for calculating a first amount derived from the purchased raw materials and a second amount derived from the recycled raw materials out of the product amount of the target product, a difference component amount calculation unit for calculating a third amount derived from the purchased raw materials and a fourth amount derived from the recycled raw materials out of the target product difference amounts between the amount of material used in the production of the target product and the product amount of the target product, and The system includes a product emission calculation unit that calculates a first CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw materials used by the first amount calculated by the product component amount calculation unit, and calculates a second CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw materials used in the production of the target product by the second amount calculated by the product component amount calculation unit; and a differential emission calculation unit that calculates a third CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw materials used in the production of the target product by the third amount calculated by the differential component amount calculation unit, and calculates a fourth CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw materials used in the production of the target product by the fourth amount calculated by the differential component amount calculation unit.

[0009] This carbon dioxide emission calculation system calculates the first and third amounts derived from purchased raw materials, so it can calculate the first and third CO2 emissions related to the purchased raw materials, and calculates the second and fourth amounts derived from recycled raw materials, so it can calculate the second and fourth CO2 emissions related to recycled raw materials.The carbon dioxide emission calculation system can manage CO2 emissions related to purchased raw materials and CO2 emissions related to recycled raw materials separately.

[0010] In another aspect, in the above-mentioned carbon dioxide emission calculation system, the product component amount calculation unit calculates the smaller of the product amount of the target product and the amount of the purchased raw materials used to produce the target product as the first amount, and calculates the second amount by subtracting the first amount from the product amount of the target product, and the differential component amount calculation unit calculates the third amount by subtracting the first amount from the amount of the purchased raw materials used to produce the target product, and calculates the fourth amount by subtracting the second amount from the amount of the recycled raw materials used to produce the target product.

[0011] Such a carbon dioxide emission calculation system can appropriately determine the first to fourth amounts.

[0012] In another aspect, in the carbon dioxide emission calculation system described above, when a plurality of products are manufactured during the predetermined period, the product component amount calculation unit determines each of the plurality of products as the target product to obtain a first amount and a second amount for each of the plurality of products, the differential component amount calculation unit determines each of the plurality of products as the target product to obtain a third amount and a fourth amount for each of the plurality of products, and the product emission calculation unit determines each of the plurality of products as the target product to obtain a first CO2 emission amount and a second CO2 emission amount for each of the plurality of products. The differential emission calculation unit calculates the second CO2 emission amount, and further includes a total emission calculation unit by material that calculates the third CO2 emission amount and the fourth CO2 emission amount for each of the plurality of products by treating each of the plurality of products as the target product, and calculates the differential total CO2 emission amount for each type of material by summing the third and fourth CO2 emissions of products that use that type of material in their production, and a first allocation amount calculation unit that allocates the differential total CO2 emission amount for each type of material calculated by the total emission calculation unit by material to products that use that type of material in their production in proportion to the product volume.

[0013] Such a carbon dioxide emission calculation system can allocate the differential total CO2 emission to each product in proportion to the product amount.

[0014] In another aspect, in the above-mentioned carbon dioxide emission calculation system, the first allocation amount calculation unit further calculates the CO2 emissions related to the target product by totaling the allocated CO2 emissions allocated to the target product, the first CO2 emissions of the target product, and the second CO2 emissions of the target product. Preferably, in the above-mentioned carbon dioxide emission calculation system, the first allocation amount calculation unit further calculates the CO2 emissions related to each of the plurality of products by totaling the allocated CO2 emissions allocated to that product, the first CO2 emissions of that product, and the second CO2 emissions of that product.

[0015] Such a carbon dioxide emission calculation system can calculate the amount of CO2 emission for a target product when the total difference in CO2 emission is allocated to the products in proportion to the product amounts.

[0016] In another aspect, in the carbon dioxide emission calculation system described above, when a plurality of products are manufactured during the predetermined period, the product component amount calculation unit determines each of the plurality of products as the target product to obtain a first amount and a second amount for each of the plurality of products, the differential component amount calculation unit determines each of the plurality of products as the target product to obtain a third amount and a fourth amount for each of the plurality of products, and the product emission amount calculation unit determines each of the plurality of products as the target product to obtain a first CO2 emission amount and a second CO2 emission amount for each of the plurality of products. The differential emission calculation unit calculates the third CO2 emission amount and the fourth CO2 emission amount for each of the plurality of products by treating each of the plurality of products as the target product, and for each type of material, calculates the differential total CO2 emission amount for that type of material by summing the third and fourth CO2 emissions of products that use that type of material in their production; and a second allocation amount calculation unit allocates, for each type of material, the differential total CO2 emission amount for that type of material calculated by the total emission calculation unit for that type of material to the products that use that type of material in their production in the ratio of the product difference between the material amount and the product amount.

[0017] Such a carbon dioxide emission calculation system can allocate the differential total CO2 emission to each product in proportion to the amount of the product differential.

[0018] In another aspect, in the above-mentioned carbon dioxide emission calculation system, the second allocation amount calculation unit further calculates the CO2 emissions related to the target product by totaling the allocated CO2 emissions allocated to the target product, the first CO2 emissions of the target product, and the second CO2 emissions of the target product. Preferably, in the above-mentioned carbon dioxide emission calculation system, the second allocation amount calculation unit further calculates the CO2 emissions related to each of the plurality of products by totaling the allocated CO2 emissions allocated to that product, the first CO2 emissions of that product, and the second CO2 emissions of that product.

[0019] Such a carbon dioxide emission calculation system can calculate the amount of CO2 emission for a target product when the difference total CO2 emission is allocated to the products in the ratio of the amount of product difference.

[0020] A carbon dioxide emission calculation program according to another aspect of the present invention is a method for calculating CO2 emissions related to target products manufactured during a predetermined period in a factory capable of manufacturing a plurality of types of products manufactured from materials through a plurality of processes, wherein the materials include purchased raw materials and recycled raw materials obtained by recycling a difference between the amount of raw materials and the amount of product generated in the implementation of the processes into raw materials, and the program includes a product component amount calculation step for calculating a first amount derived from the purchased raw materials and a second amount derived from the recycled raw materials out of the product amount of the target product; a difference component amount calculation step for calculating a third amount derived from the purchased raw materials and a fourth amount derived from the recycled raw materials out of the target product difference amounts between the amount of raw materials used in the production of the target product and the product amount of the target product; a product emission calculation step of calculating a first CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw material by the first amount calculated in the product component amount calculation step, and calculating a second CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw material used in the production of the target product by the second amount calculated in the product component amount calculation step; and a differential emission calculation step of calculating a third CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw material used in the production of the target product by the third amount calculated in the differential component amount calculation step, and calculating a fourth CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw material used in the production of the target product by the fourth amount calculated in the differential component amount calculation step.

[0021] This carbon dioxide emission calculation method determines the first and third amounts derived from purchased raw materials, making it possible to determine the first and third CO2 emissions related to the purchased raw materials, and determines the second and fourth amounts derived from recycled raw materials, making it possible to determine the second and fourth CO2 emissions related to recycled raw materials.The above carbon dioxide emission calculation method can manage CO2 emissions related to purchased raw materials and CO2 emissions related to recycled raw materials separately.

[0022] Another aspect of the carbon dioxide emission calculation program of the present invention is a program for calculating the CO2 emissions for target products manufactured during a specified period in a factory capable of manufacturing multiple types of products that are manufactured from materials through multiple processes, and is a program for causing a computer to function as any of the above-mentioned carbon dioxide emission calculation systems.

[0023] This makes it possible to provide a carbon dioxide emission calculation program, which has the same effects as the carbon dioxide emission calculation system described above. [Effects of the Invention]

[0024] The carbon dioxide emission amount calculation system, carbon dioxide emission amount calculation method, and carbon dioxide emission amount calculation program according to the present invention can manage CO2 emissions related to purchased raw materials separately from CO2 emissions related to recycled raw materials. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a diagram showing a configuration of a carbon dioxide emission amount calculation system according to an embodiment. [Figure 2] FIG. 10 is a diagram showing a product information table as an example. [Figure 3] FIG. 10 is a diagram showing an example of a unit discharge amount information table. [Figure 4] FIG. 2 is a diagram for explaining an outline of calculations performed by the carbon dioxide emission calculation system. [Figure 5] FIG. 10 is a diagram illustrating the calculation of first to fourth quantities as an example. [Figure 6] FIG. 10 is a diagram for explaining, as an example, the calculation of first to fourth CO2 emission amounts. [Figure 7] FIG. 10 is a diagram illustrating the difference in total CO 2 emissions by material type, as an example. [Figure 8] As an example, this is a diagram for explaining the allocation amount of each product allocated based on the product amount ratio. [Figure 9]FIG. 10 is a diagram illustrating, as an example, the calculation of the amount of CO2 emissions for each product after allocation. [Figure 10] 4 is a flowchart showing the operation of the carbon dioxide emission calculation system. [Figure 11] FIG. 10 is a diagram illustrating, as an example, the allocation amount of each product allocated in proportion to the amount of product difference in a modified embodiment. [Figure 12] FIG. 10 is a diagram illustrating, as an example, the calculation of the amount of CO2 emissions for each product after allocation in the modified embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. In addition, components with the same reference numerals in each drawing indicate the same components, and their description will be omitted as appropriate. In this specification, when referring to a general term, a reference numeral without a subscript is used, and when referring to an individual component, a reference numeral with a subscript is used.

[0027] The carbon dioxide emission calculation system in one embodiment is a system that calculates the amount of carbon dioxide emissions (CO2 emissions) for target products manufactured over a specified period in a factory (plant) capable of manufacturing multiple types of products from materials through multiple processes. In this carbon dioxide emission calculation system, the materials include purchased raw materials and recycled raw materials. The purchased raw materials are raw materials procured from outside. The recycled raw materials are materials (factory scraps, waste materials) that are generated during the implementation of the process and represent the difference (product difference) between the amount of materials (material amount) and the amount of product (product amount), and are recycled into raw materials. This carbon dioxide emission calculation system includes a product component amount calculation unit, a differential component amount calculation unit, a product emission calculation unit, and a differential emission calculation unit. The product component amount calculation unit calculates a first amount derived from the purchased raw materials and a second amount derived from the recycled raw materials out of the product amount of the target product. The differential component amount calculation unit calculates a third amount derived from the purchased raw materials and a fourth amount derived from the recycled raw materials out of the target product difference amount (target product difference amount) between the amount of materials used in the production of the target product and the product amount of the target product. The product emission calculation unit calculates a first CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw materials used in the production of the target product by the first amount calculated by the product component amount calculation unit, and calculates a second CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw materials used in the production of the target product by the second amount calculated by the product component amount calculation unit. The differential emission calculation unit calculates a third CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw materials used in the production of the target product by the third amount calculated by the differential component amount calculation unit, and calculates a fourth CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw materials used in the production of the target product by the fourth amount calculated by the differential component amount calculation unit.

[0028] The following describes in more detail such a carbon dioxide emission calculation system, as well as a carbon dioxide emission calculation method and a carbon dioxide emission calculation program implemented therein. Here, as an example, a factory (plant) capable of producing a variety of rolled steel plates will be used. However, the factory (plant) may be any type as long as it is capable of producing multiple types of products that are manufactured from raw materials through multiple processes. The carbon dioxide emission calculation system may be configured by interconnecting an input / output terminal device that inputs and outputs data, one or more arithmetic processing devices (e.g., server devices) that perform various arithmetic processing, and one or more database devices that store (manage) various data. At least some of these input / output terminal devices, one or more arithmetic processing devices, and one or more database devices may be integrated and interconnected for communication with the remainder. However, the carbon dioxide emission calculation system will be described here using an example of an integrated carbon dioxide emission calculation device.

[0029] FIG. 1 is a diagram showing the configuration of a carbon dioxide emission calculation system in an embodiment. FIG. 2 is a diagram showing, as an example, a product information table. FIG. 3 is a diagram showing, as an example, a unit emission information table. FIG. 4 is a diagram for explaining an overview of calculations in the carbon dioxide emission calculation system. FIG. 5 is a diagram for explaining, as an example, the calculation of first to fourth amounts. FIG. 6 is a diagram for explaining, as an example, the calculation of first to fourth CO2 emission amounts. FIG. 7 is a diagram for explaining, as an example, the differential total CO2 emission amount by material type. FIG. 8 is a diagram for explaining, as an example, the allocation amount of each product allocated based on the product amount ratio. FIG. 9 is a diagram for explaining, as an example, the calculation of CO2 emission amount for each product after allocation.

[0030] The carbon dioxide emission calculation system (carbon dioxide emission calculation device as an example) 1000 in the embodiment includes, for example, an input unit 1, an output unit 2, an interface unit (IF unit) 3, a control processing unit 4, and a memory unit 5, as shown in FIG.

[0031] The input unit 1 is connected to the control processing unit 4 and is a device that inputs various commands, such as a command to start calculations, and various data necessary for operating the carbon dioxide emission calculation device 1000, such as various quantities and the amount of CO2 emitted per unit amount, to the carbon dioxide emission calculation device 1000, and is, for example, a keyboard, a mouse, or a plurality of input switches to which predetermined functions are assigned. The output unit 2 is connected to the control processing unit 4 and is a device that outputs the commands, data, calculation results, etc. input from the input unit 1 under the control of the control processing unit 4, and is, for example, a display device such as a CRT display, LCD (liquid crystal display), or organic EL display, or a printing device such as a printer.

[0032] The input unit 1 and the output unit 2 may be configured as a touch panel. In the case of configuring this touch panel, the input unit 1 is a position input device that detects and inputs an operation position, for example, a resistive film type or a capacitive type, and the output unit 2 is a display device. In this touch panel, a position input device is provided on the display surface of the display device, and one or more input content candidates that can be input to the display device are displayed on the display device. When a user touches the display position showing the input content they want to input, the position is detected by the position input device, and the display content displayed at the detected position is input to the carbon dioxide emission calculation device 1000 as the user's operation input content. With such a touch panel, the user can easily intuitively understand the input operation, and therefore a carbon dioxide emission calculation device 1000 that is easy for the user to use is provided.

[0033] The IF unit 3 is connected to the control processing unit 4 and is a circuit that inputs and outputs data to and from, for example, an external device under the control of the control processing unit 4, and is, for example, an interface circuit for RS-232C, which is a serial communication method, an interface circuit using the Bluetooth (registered trademark) standard, an interface circuit using the USB standard, etc. The IF unit 3 may also be, for example, a communication interface circuit that transmits and receives communication signals to and from an external device, such as a data communication card or a communication interface circuit conforming to the IEEE802.11 standard, etc.

[0034] The storage unit 5 is connected to the control processing unit 4 and is a circuit that stores various predetermined programs and various predetermined data under the control of the control processing unit 4.

[0035] The various predetermined programs include, for example, a control processing program, and the control processing program includes, for example, a control program, a product component amount calculation program, a differential component amount calculation program, a product emission amount calculation program, a differential emission amount calculation program, a material-specific total emission amount calculation program, and a first allocation amount calculation program. The control program controls each of the units 1 to 3, 5 of the carbon dioxide emission calculation device 1000 according to the function of each unit. The product component amount calculation program is a program that calculates a first amount derived from the purchased raw materials and a second amount derived from the recycled raw materials out of the product amount of the target product. The differential component amount calculation program is a program that calculates a third amount derived from the purchased raw materials and a fourth amount derived from the recycled raw materials out of the target product difference amount (target product difference amount) between the amount of materials used in the production of the target product and the product amount of the target product. The product emission calculation program calculates a first CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw materials used in the production of the target product by a first amount calculated by the product component amount calculation program, and calculates a second CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw materials used in the production of the target product by a second amount calculated by the product component amount calculation program. The differential emission calculation program calculates a third CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw materials used in the production of the target product by a third amount calculated by the differential component amount calculation program, and calculates a fourth CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw materials used in the production of the target product by a fourth amount calculated by the differential component amount calculation program. The material-specific total emission calculation program calculates the total CO2 emission amount of a type of material by summing the first through fourth CO2 emissions of products using that type of material for its production. The first allocation amount calculation program is a program that allocates, for each type of material, the total CO2 emissions of that type of material calculated by the total emissions by material calculation program to products that use that type of material in their production, in proportion to the product volume.

[0036] The various types of predetermined data include, for example, product information, unit discharge amount information, various intermediate calculation results, and final calculation results, which are necessary for executing each of these programs.

[0037] The storage unit 5 includes, for example, a ROM (Read Only Memory) which is a nonvolatile storage element, an EEPROM (Electrically Erasable Programmable Read Only Memory) which is a rewritable nonvolatile storage element, etc. The storage unit 5 also includes a RAM (Random Access Memory) which serves as a working memory for the control processing unit 4 and stores data generated during execution of the predetermined program, etc. The storage unit 5 may also be configured to include a hard disk device or a solid state drive (SSD) with a relatively large storage capacity.

[0038] The storage unit 5 functionally comprises a product information storage unit 51 and a unit discharge amount information storage unit 52 in order to store product information and unit discharge amount information, respectively.

[0039] The product information storage unit 51 stores product information. The product information is information about a product that is necessary to calculate the first to fourth amounts. More specifically, in this embodiment, the product information is the amount of purchased raw materials and recycled raw materials in the material amount, the material amount, and the product amount for each product. Each of these amounts is expressed, for example, by weight and volume. Furthermore, in this embodiment, since the differential total CO2 emissions are calculated for each type of material, the product information further includes the type of material.

[0040] In this embodiment, this product information is stored in table format in the product information storage unit 51. The product information table PT for registering this product information includes, for example, a product name field 512 for registering the product name of the product, a material type name field 511 for registering the type of material used to manufacture the product with the product name registered in the product name field 512, a purchased material quantity field 513 for registering the purchased amount of the material used to manufacture the product with the product name registered in the product name field 512, a recycled material quantity field 514 for registering the recycled amount of the material used to manufacture the product with the product name registered in the product name field 512, a material quantity field 515 for registering the material quantity of the material used to manufacture the product with the product name registered in the product name field 512, and a product quantity field 516 for registering the product quantity of the product with the product name registered in the product name field 512, and has a record for each product name. In the example shown in FIG. 2, each quantity is expressed in weight [tons].

[0041] The product information may be past actual values ​​for a predetermined period (e.g., a quarter or a year) to examine the actual situation, or may be expected values ​​for a predetermined period to perform a prediction simulation, for example.

[0042] The unit emission amount information storage unit 52 stores unit emission amount information. The unit emission amount information is information related to unit CO2 emission amount required to calculate the first to fourth CO2 emission amounts. More specifically, in this embodiment, the unit emission amount information is the CO2 emission amount per unit amount of purchased raw material (purchased raw material unit CO2 emission amount) and the CO2 emission amount per unit amount of recycled raw material (recycled raw material unit CO2 emission amount), which are defined for each type of material in this embodiment.

[0043] In this embodiment, the unit emission information is stored in table format in the unit emission information storage unit 52. The unit emission information table UT, which registers this unit emission information, includes, for example, as shown in Fig. 3, a material type name field 521 for registering the type name of the material, a purchased raw material unit CO2 emission field 522 for registering the purchased raw material unit CO2 emission [tCO2 / ton], and a recycled raw material unit CO2 emission field 523 for registering the recycled raw material unit CO2 emission [tCO2 / ton], and has a record for each material type name.

[0044] As described above, such product information and unit emission information may be input to carbon dioxide emission calculation system 1000 from input unit 1. Alternatively, for example, the product information and unit emission information may be input to carbon dioxide emission calculation system 1000 from a storage medium (e.g., a USB memory or an SD card (registered trademark)) that stores the information via IF unit 3, or may be input to carbon dioxide emission calculation system 1000 from a storage medium (e.g., a CD-R or a DVD-R) that records the information via its drive device and IF unit 3, or may be input to carbon dioxide emission calculation system 1000 from a management server device that manages the information via a communication network and IF unit 3. The control processing program and the like may also be input to carbon dioxide emission calculation system 1000 and stored in memory unit 5.

[0045] The control processing unit 4 is a circuit for controlling each of the units 1 to 3, and 5 of the carbon dioxide emission calculation device 1000 in accordance with the function of each unit, and for calculating the amount of CO2 emission. The control processing unit 4 is configured to include, for example, a CPU (Central Processing Unit) and its peripheral circuits. When the control processing program is executed, the control processing unit 4 is functionally configured to include a control unit 41, a product component amount calculation unit 42, a differential component amount calculation unit 43, a product emission amount calculation unit 44, a differential emission amount calculation unit 45, a material-specific total emission amount calculation unit 46, and a first allocation amount calculation unit 47.

[0046] The control unit 41 controls each of the units 1 to 3 and 5 of the carbon dioxide emission calculation device 1000 according to the function of each unit, and is in charge of overall control of the carbon dioxide emission calculation device 1000.

[0047] The product component amount calculation unit 42 calculates the first amount derived from the purchased raw materials and the second amount derived from the recycled raw materials within the product amount of the target product. In the example shown in FIG. 2, multiple products are manufactured during a predetermined period, and the product component amount calculation unit 42 calculates the first amount and the second amount for each of the multiple products by treating each of the multiple products as the target product. More specifically, because the amount of purchased raw materials may exceed the product amount, the product component amount calculation unit 42 calculates the smaller of the product amount of the target product and the amount of the purchased raw materials used in the production of the target product (purchased raw material amount) as the first amount ((first amount) = min((product amount), (purchased raw materials)), where min(a, b) is an operator that calculates the smaller of a and b). This allows the first amount to be appropriately calculated. Because the shortage of purchased raw materials within the product amount is made up by the amount of recycled raw materials, the product component amount calculation unit 42 calculates the second amount by subtracting the first amount from the product amount of the target product ((second amount) = (product amount) - (first amount)). This allows the second amount to be calculated appropriately. Purchased raw materials include a variety of items, such as bullion and scrap in the case of metallic materials. In the example shown in FIG. 2, if the target product is a product with a product name "S1," the product amount is "5" [tons] and the purchased raw materials amount is "6" [tons], as shown in FIGS. 4 and 5, so the first amount is 5 [tons] (= min(5, 6)) and the second amount is 0 [tons] (= 5 - 5).

[0048] The differential component amount calculation unit 43 calculates the third amount derived from the purchased raw materials and the fourth amount derived from the recycled raw materials out of the difference between the amount of material used in the production of the target product and the finished amount of the target product (target product difference amount). In the example shown in FIG. 2, multiple products are produced during a predetermined period, so the differential component amount calculation unit 43 calculates the third amount and the fourth amount for each of the multiple products by treating each of the multiple products as the target product. Since the amount of purchased raw materials that did not make it into the finished amount is included in the product difference amount, the differential component amount calculation unit 43 calculates the third amount by subtracting the first amount from the amount of purchased raw materials used in the production of the target product ((third amount) = (purchased raw material amount) - (first amount)). This allows the third amount to be calculated appropriately. The amount of recycled raw materials used that did not become the product amount is included in the product difference amount, so the differential component amount calculation unit 43 calculates the fourth amount by subtracting the second amount from the amount of recycled raw materials used in manufacturing the target product (recycled raw material amount) ((fourth amount) = (recycled raw material amount) - (second amount)). This allows the fourth amount to be calculated appropriately. In the case of metal materials, examples of product difference items include scraps and offcuts generated by cutting, shavings generated by machining, and grinding shavings generated by polishing.

[0049] In the example shown in Figure 2, for example, if the target product is a product with the product name "S1," the amount of purchased raw materials is "6" [tons] and the amount of recycled raw materials is "4" [tons], as shown in Figures 4 and 5, so the third amount is 1 [ton] (= 6 - 5) and the fourth amount is 4 [tons] (= 4 - 0).

[0050] In the example shown in Figure 2, the first to fourth quantities are similarly determined for each of the products with the product name "S2", "S3", "S4", "S5", and "S6", as shown in Figure 5.

[0051] While the example shown in Figure 4 shows a case where the amount of purchased raw materials is greater than the amount of finished product, cases where the amount of purchased raw materials is less than the amount of finished product, or where the amount of purchased raw materials is equal to the amount of finished product, can also be illustrated in the same way, and the first to fourth amounts can be calculated in the same way. The "yield loss" shown in Figure 4 is the opposite of the general yield, which is the ratio of the amount of finished product to the amount of raw materials input. It is the ratio of the amount of loss that occurs from raw materials to the amount of finished product, but here it is used to mean the loss (loss). The loss (loss) can refer to the difference (process difference) between the amount of input (input amount) input to the process and the amount that passes through the process (output amount) depending on the execution of the process, or it can refer to the difference (product difference) between the amount of raw materials and the amount of finished product. Therefore, the term "yield loss" is not used in this specification.

[0052] The product emission calculation unit 44 calculates a first amount of CO2 emission by multiplying the amount of CO2 emission per unit amount of the purchased raw material used in the production of the target product (CO2 emission per unit of purchased raw material) by the first amount calculated by the product component amount calculation unit 42, and calculates a second amount of CO2 emission by multiplying the amount of CO2 emission per unit amount of the recycled raw material used in the production of the target product (CO2 emission per unit of recycled raw material) by the second amount calculated by the product component amount calculation unit 42. In the example shown in Fig. 2, since a plurality of products are produced in a predetermined period, the product emission calculation unit 44 calculates the first amount of CO2 emission and the second amount of CO2 emission for each of the plurality of products by treating each of the plurality of products as the target product. In the examples shown in Figures 2 and 3, for example, if the target product is a product with the product name "S1", as shown in Figures 4 to 6, the CO2 emissions per unit of purchased raw material is "5" [tCO2 / ton], the first amount is "5" [ton], the CO2 emissions per unit of recycled raw material is "0.5" [tCO2 / ton], and the second amount is "0" [ton], so the first CO2 emissions is "25" [tCO2] (= 5 x 5) and the second CO2 emissions is "0" [tCO2] (= 0.5 x 0).

[0053] The differential emission calculation unit 45 calculates the third CO2 emission amount by multiplying the CO2 emission amount per unit amount of the purchased raw material used in the production of the target product (CO2 emission amount per purchased raw material) by the third amount calculated by the differential component amount calculation unit, and calculates the fourth CO2 emission amount by multiplying the CO2 emission amount per unit amount of the recycled raw material used in the production of the target product (CO2 emission amount per recycled raw material) by the fourth amount calculated by the differential component amount calculation unit. In the example shown in Figure 2, multiple products are produced during a predetermined period, so the differential emission calculation unit 45 calculates the third CO2 emission amount and the fourth CO2 emission amount for each of the multiple products by treating each of the multiple products as the target product. In the examples shown in Figures 2 and 3, for example, if the target product is a product with the product name "S1," as shown in Figures 4 to 6, the CO2 emissions per unit of purchased raw material is "5" [tCO2 / ton], the third amount is "1" [ton], the CO2 emissions per unit of recycled raw material is "0.5" [tCO2 / ton], and the fourth amount is "4" [ton], so the third CO2 emissions are "5" [tCO2] (= 5 x 1) and the fourth CO2 emissions are "2" [tCO2] (= 0.5 x 4).

[0054] In the example shown in Figure 2, the first to fourth quantities are similarly determined for each of the products with the product name "S2", "S3", "S4", "S5", and "S6", as shown in Figure 6.

[0055] In Figure 6, the three columns on the right side show the CO2 emissions per unit amount of product (product-unit CO2 emissions), the CO2 emissions per unit amount of product difference (product-difference unit CO2 emissions), and the sum of these. For example, for a product named "S1," the product-unit CO2 emissions is 5 tCO2 / ton (= ((first CO2 emissions) + (second CO2 emissions)) / ((first amount) + (second amount)) = (25 + 0) / (5 + 0)), and the product-difference unit CO2 emissions is 1.4 tCO2 / ton (= ((third CO2 emissions) + (fourth CO2 emissions)) / ((first amount) + (second amount)) = (5 + 2) / (5 + 0)), and the sum of these is 6.4 tCO2 / ton (= 5 + 1.4).

[0056] The material-specific total emission calculation unit 46 calculates the differential total CO2 emission for each type of material by summing up the third and fourth CO2 emissions of products that use that type of material in their production. In the example shown in Figures 2 and 3, the differential total CO2 emission for a material with a material type name "M1" is 13 [tCO2] (= 5 + 2 + 0 + 2.5 + 0 + 3.5), and the differential total CO2 emission for a material with a material type name "M2" is 42.4 [tCO2] (= 40 + 0 + 0 + 0.8 + 0 + 1.6), as shown in Figures 6 and 7.

[0057] The first allocation amount calculation unit 47 allocates, for each type of material, the differential total CO2 emissions of that type of material calculated by the total emission amount calculation unit by material to the products that use that type of material in their production in proportion to the product volume, thereby calculating the allocated CO2 emissions to be allocated to the products in proportion to the product volume. In the example shown in Figures 2 and 3, as shown in Figures 5, 7 and 8, the products that use the material with the material type name "M1" are the product with the product name "S1", the product with the product name "S2", and the product with the product name "S3", and the product volume of the product with the product name "S1" is "5" [tons], the product with the product name "S2" is "5" [tons], and the product volume of the product with the product name "S3" is "3" [tons]. Therefore, the product with the product name "S1" is allocated an allocated CO2 emission of "5" [tCO2] (= 13 × (5 / (5 + 5 + 3))), the product with the product name "S2" is allocated an allocated CO2 emission of "5" [tCO2] (= 13 × (5 / (5 + 5 + 3))), and the product with the product name "S3" is allocated an allocated CO2 emission of "3" [tCO2] (= 13 × (3 / (5 + 5 + 3))). The products that use the material with the material type name "M2" are the product with the product name "S4", the product with the product name "S5", and the product with the product name "S6". The product quantity of the product with the product name "S4" is "16" [tons], the product quantity of the product with the product name "S5" is "8" [tons], and the product quantity of the product with the product name "S6" is "16" [tons]. Therefore, the product with the product name "S4" has the allocation C O2 emissions of "16.96" [tCO2] (= 42.4 × (16 / (16 + 8 + 16))) are allocated, the product with the product name "S5" is allocated allocated CO2 emissions of "8.48" [tCO2] (= 42.4 × (8 / (16 + 8 + 16))) and the product with the product name "S6" is allocated allocated CO2 emissions of "16.96" [tCO2] (= 42.4 × (16 / (16 + 8 + 16)))

[0058] The first allocation amount calculation unit 47 further calculates the CO2 emissions related to the target product by totaling the allocated CO2 emissions allocated to the target product, the first CO2 emissions of the target product, and the second CO2 emissions of the target product. In the example shown in Figure 2, multiple products are manufactured during a predetermined period, so the first allocation amount calculation unit 47 further calculates the CO2 emissions related to each of the multiple products by totaling the allocated CO2 emissions allocated to that product, the first CO2 emissions of that product, and the second CO2 emissions of that product. In the example shown in Figures 2 and 3, for example, if the target product is a product named "S1," as shown in Figure 9, the CO2 emissions related to the product named "S1" are calculated as "30" [tCO2] (=5 + 25 + 0) by totaling the allocated CO2 emissions of "5" [tCO2], the first CO2 emissions of "25" [tCO2], and the second CO2 emissions of "0" [tCO2].

[0059] In the example shown in Figure 2, the CO2 emissions for each of the products with the product name "S2", "S3", "S4", "S5" and "S6" can be calculated in the same way as shown in Figure 9.

[0060] In Figure 9, the three columns on the right side show the CO2 emissions per unit amount of product in the total product CO2 emissions (product-unit CO2 emissions), the CO2 emissions per unit amount of product in the allocated CO2 emissions (allocated unit CO2 emissions), and the sum of these. For example, for a product named "S1," the product-unit CO2 emissions are 5 [tCO2 / ton] (= ((first CO2 emissions "25" [tCO2]) + (second CO2 emissions "0" [tCO2]) / (product amount "5" [ton])), and the allocated unit CO2 emissions are 1 [tCO2 / ton] (= (allocated CO2 emissions "5" [tCO2]) / (product amount "5" [ton])), and the sum of these is 6 [tCO2 / ton] (= 5 + 1).

[0061] The input unit 1, output unit 2, IF unit 3, control processing unit 4, and storage unit 5 in the carbon dioxide emission calculation device 1000, which is an example of a carbon dioxide emission calculation system, can be configured by, for example, a desktop computer, a notebook computer, etc. Of course, as described above, the carbon dioxide emission calculation system may be configured by a plurality of computers connected to each other so that they can communicate with each other.

[0062] Next, the operation of this embodiment will be described below: Fig. 10 is a flowchart showing the operation of the carbon dioxide emission amount calculation system (one example of the carbon dioxide emission amount calculation device).

[0063] When the power is turned on, the carbon dioxide emission calculation device 1000 configured as described above initializes each necessary unit and starts operation. By executing the control processing program, the control processing unit 4 functionally configures a control unit 41, a product component amount calculation unit 42, a differential component amount calculation unit 43, a product emission amount calculation unit 44, a differential emission amount calculation unit 45, a material-specific total emission amount calculation unit 46, and a first allocation amount calculation unit 47.

[0064] 10, the carbon dioxide emission calculation device 1000 first calculates the first and second amounts as the product component amounts using the product component amount calculation unit 42 of the control processing unit 4 (S1). When a plurality of products are manufactured in a predetermined period, the product component amount calculation unit 42 calculates the first and second amounts for each of the plurality of products.

[0065] Next, the carbon dioxide emission calculation device 1000 determines the third and fourth amounts as the differential component amounts using the differential component amount calculation unit 43 of the control processing unit 4 (S2). When a plurality of products are manufactured in a predetermined period, the differential component amount calculation unit 43 determines the third and fourth amounts for each of the plurality of products.

[0066] Next, the carbon dioxide emission calculation device 1000 calculates the first and second CO2 emission amounts using the product emission calculation unit 44 of the control processing unit 4 (S3). When a plurality of products are manufactured in a predetermined period, the product emission calculation unit 43 calculates the first and second CO2 emission amounts for each of the plurality of products.

[0067] Next, the carbon dioxide emission amount calculation device 1000 calculates the third and fourth CO2 emission amounts using the differential emission amount calculation unit 45 of the control processing unit 4 (S4). When a plurality of products are manufactured in a predetermined period, the differential emission amount calculation unit 45 calculates the third and fourth CO2 emission amounts for each of the plurality of products.

[0068] Next, the carbon dioxide emission amount calculation device 1000 determines the differential total CO2 emission amount for each type of material using the material-specific total emission amount calculation unit 46 of the control processing unit 4 (S5).

[0069] Next, the carbon dioxide emission amount calculation device 1000 causes the first allocation amount calculation unit 47 of the control processing unit 4 to calculate the allocated CO2 emission amount to be allocated to the products in proportion to the product amounts (S6). When a plurality of products are manufactured in a predetermined period, the first allocation amount calculation unit 47 calculates the allocated CO2 emission amount for each of the plurality of products.

[0070] Next, the carbon dioxide emission amount calculation device 1000 calculates the amount of CO2 emission for the product after allocation by the first allocation amount calculation unit 47 (S7). When a plurality of products are manufactured in a predetermined period, the first allocation amount calculation unit 47 calculates the amount of CO2 emission for each of the plurality of products after allocation.

[0071] Then, the carbon dioxide emission calculation device 1000 causes the control unit 41 of the control processing unit 4 to output each calculation result from the output unit 2 (S8), and ends this process. Note that the control unit 41 may output each calculation result to an external device via the IF unit 3 as necessary.

[0072] As described above, the carbon dioxide emission calculation system (one example of a carbon dioxide emission calculation device) 1000 in the embodiment, and the carbon dioxide emission calculation method and carbon dioxide emission calculation program implemented therein, determine the first and third amounts derived from purchased raw materials, and can therefore determine the first and third CO2 emissions related to the purchased raw materials, and determine the second and fourth amounts derived from recycled raw materials, and can therefore determine the second and fourth CO2 emissions related to the recycled raw materials. The carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can manage the CO2 emissions related to purchased raw materials and the CO2 emissions related to recycled raw materials separately.

[0073] The carbon dioxide emission amount calculation system (carbon dioxide emission amount calculation device) 1000, the carbon dioxide emission amount calculation method, and the carbon dioxide emission amount calculation program can allocate the difference total CO2 emission amount to each product in the ratio of the product amount.

[0074] The carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can calculate the CO2 emission amount for a target product when the differential total CO2 emission amount is allocated to the products in proportion to the product amount.

[0075] In the above-described embodiment, the carbon dioxide emission calculation system (one example of a carbon dioxide emission calculation device) 1000 allocates the differential total CO2 emission to products in proportion to the product amounts, but the differential total CO2 emission may also be allocated to products in proportion to the amount of product difference (variant). In this variant, the carbon dioxide emission calculation system (one example of a carbon dioxide emission calculation device) 1000 functionally includes a second allocation amount calculation unit 48 shown by a dashed line in FIG. 1 in the control processing unit 4. This second allocation amount calculation unit 48 allocates, for each type of material, the differential total CO2 emission of that type of material calculated by the material-specific total emission calculation unit 46 to products that use that type of material in their production in proportion to the amount of product difference between the material amount and the product amount. This allows the allocated CO2 emission to be allocated to products in proportion to the amount of product difference.

[0076] Fig. 11 is a diagram illustrating, as an example, the allocation amount of each product allocated based on the ratio of the product difference amount in a modified embodiment. Fig. 12 is a diagram illustrating, as an example, the calculation of the CO2 emissions of each product after allocation in the modified embodiment.

[0077] In the example shown in Figs. 2 and 3, as shown in Figs. 5, 7 and 11, the products using the material with the material type name "M1" are the product with the product name "S1", the product with the product name "S2" and the product with the product name "S3", and the product difference amount for the product with the product name "S1" is "5" [tons], the product difference amount for the product with the product name "S2" is "5" [tons] and the product difference amount for the product with the product name "S3" is "7" [tons]. The products are allocated CO2 emissions of "3.82" [tCO2] (= 13 × (5 / (5 + 5 + 7)), rounded to two decimal places), the product with product name "S2" is allocated CO2 emissions of "3.82" [tCO2] (= 13 × (5 / (5 + 5 + 7)), rounded to two decimal places), and the product with product name "S3" is allocated CO2 emissions of "5.35" [tCO2] (= 13 × (7 / (5 + 5 + 7)), rounded to two decimal places). The products that use the material with the material type name "M2" are the products with the product names "S4", "S5", and "S6". The product amount for the product with the product name "S4" is "4" [tons], the product difference amount for the product with the product name "S5" is "2" [tons], and the product difference amount for the product with the product name "S6" is "4" [tons]. will be allocated CO2 emissions of "16.96" [tCO2] (= 42.4 × (4 / (4 + 2 + 4))), the product with product name "S5" will be allocated CO2 emissions of "8.48" [tCO2] (= 42.4 × (2 / (4 + 2 + 4))), and the product with product name "S6" will be allocated CO2 emissions of "16.96" [tCO2] (= 42.4 × (4 / (4 + 2 + 4))).

[0078] In this modified embodiment, the second allocation amount calculation unit 48 also calculates the CO2 emissions related to the target product by totaling the allocated CO2 emissions allocated to the target product, the first CO2 emissions of the target product, and the second CO2 emissions of the target product. In the example shown in Fig. 2, multiple products are manufactured during a predetermined period, so the second allocation amount calculation unit 48 further calculates the CO2 emissions related to each of the multiple products by totaling the allocated CO2 emissions allocated to that product, the first CO2 emissions of that product, and the second CO2 emissions of that product. In the examples shown in Figures 2 and 3, for example, if the target product is a product with the product name "S1", the CO2 emissions for the product with the product name "S1" of "28.82" [tCO2] (=3.82+25+0) can be obtained by adding up the allocated CO2 emissions of "3.82" [tCO2], the first CO2 emissions of "25" [tCO2], and the second CO2 emissions of "0" [tCO2], as shown in Figure 12.

[0079] In the example shown in Figure 2, the CO2 emissions for each of the products with the product name "S2", "S3", "S4", "S5" and "S6" can be calculated in the same way as shown in Figure 12.

[0080] In addition, in Figure 12, the three columns on the right side show the product unit CO2 emissions, allocation unit CO2 emissions, and the total of these. For example, for a product with the product name "S1," the product unit CO2 emissions is 5 [tCO2 / ton] (= ((first CO2 emissions "25" [tCO2]) + (second CO2 emissions "0" [tCO2]) / (product amount "5" [ton])), and the allocation unit CO2 emissions is 0.76 [tCO2 / ton] (= (allocated CO2 emissions "3.82" [tCO2]) / (product amount "5" [ton]), rounded to two decimal places), and the total of these is "5.76" [tCO2 / ton] (= 5 + 0.76).

[0081] In order to express the present invention, the present invention has been properly and sufficiently described above through the embodiments with reference to the drawings, but it should be recognized that those skilled in the art can easily change and / or improve the above-mentioned embodiments. Therefore, unless the changes or improvements made by those skilled in the art are at a level that causes departure from the scope of the claims described in the claims, such changes or improvements are interpreted as being included in the scope of the claims. [Explanation of symbols]

[0082] 1000 Carbon dioxide emission calculation system (one example of a carbon dioxide emission calculation device) 1 Input section 2 Output section 3 Interface section (IF section) 4 Control processing section 5 Storage section 41 Control Unit 42 Product component amount calculation section 43 Difference component amount calculation unit 44 Product emissions calculation section 45 Differential emission calculation section 46 Total emissions calculation section by material 47 First distribution amount calculation unit 48 Second distribution amount calculation unit 51 Product information storage section 52 Unit emission amount information storage section

Claims

1. CO2 emissions related to target products manufactured during a specified period at a factory capable of manufacturing multiple types of products that are manufactured from materials through multiple processes. ２ A carbon dioxide emission calculation system for calculating an emission amount, The materials include purchased raw materials and recycled raw materials obtained by recycling the difference between the amount of raw materials and the amount of products generated in the implementation of the process, a product component amount calculation unit that calculates a first amount derived from the purchased raw materials and a second amount derived from the recycled raw materials out of the product amount of the target product; a difference component amount calculation unit that calculates a third amount derived from the purchased raw materials and a fourth amount derived from the recycled raw materials among the target product difference amounts between the amount of materials used in the production of the target product and the finished amount of the target product; CO per unit amount of the purchased raw material used in the production of the target product ２ The first CO is calculated by multiplying the discharge amount by the first amount calculated by the product component amount calculation unit. ２ CO emissions per unit amount of the recycled raw materials used in the production of the target product ２ The second CO is calculated by multiplying the discharge amount by the second amount calculated by the product component amount calculation unit. ２ a product discharge calculation unit for calculating a discharge amount; CO per unit amount of the purchased raw material used in the production of the target product ２ The third CO ２ CO emissions per unit amount of the recycled raw materials used in the production of the target product ２ The fourth CO ２ a differential emission calculation unit for calculating an emission amount; Carbon dioxide emissions calculation system.

2. the product component amount calculation unit determines the smaller of the product amount of the target product and the amount of the purchased raw material used in the production of the target product as the first amount, and determines the second amount by subtracting the first amount from the product amount of the target product; the differential component amount calculation unit calculates the third amount by subtracting the first amount from the amount of the purchased raw material used in the production of the target product, and calculates the fourth amount by subtracting the second amount from the amount of the recycled raw material used in the production of the target product. The carbon dioxide emission calculation system according to claim 1 .

3. In the case where multiple products are manufactured during the specified period, the product component amount calculation unit determines the first amount and the second amount for each of the plurality of products by setting each of the plurality of products as the target product; the difference component amount calculation unit determines the third amount and the fourth amount for each of the plurality of products by setting each of the plurality of products as the target product; The product discharge amount calculation unit calculates the first CO 2 for each of the plurality of products by setting each of the plurality of products as the target product. ２ Emissions and each second CO ２ Calculate the amount of emissions, The differential emission calculation unit calculates the third CO ２ Emissions and each fourth CO ２ Calculate the amount of emissions, For each type of material, the third and fourth COs of products that use that type of material in their manufacture ２ The difference total CO for that type of material is calculated by adding up the total CO emissions. ２ a material-specific total emission calculation unit for calculating the emission amount; For each type of material, the difference total CO of the material of that type calculated by the material-by-material total emission calculation unit is calculated in the ratio of the product amount to the product using that type of material in its production. ２ a first allocation amount calculation unit that allocates the discharge amount, The carbon dioxide emission calculation system according to claim 2 .

4. The first allocation amount calculation unit further calculates the allocation CO ２ Emissions, the first CO of the target product ２ Emissions and the second CO ２ By summing up the emissions, the CO ２ Determine the amount of emissions, The carbon dioxide emission calculation system according to claim 3 .

5. In the case where multiple products are manufactured during the specified period, the product component amount calculation unit determines the first amount and the second amount for each of the plurality of products by setting each of the plurality of products as the target product; the difference component amount calculation unit determines the third amount and the fourth amount for each of the plurality of products by setting each of the plurality of products as the target product; The product discharge amount calculation unit calculates the first CO 2 for each of the plurality of products by setting each of the plurality of products as the target product. ２ Emissions and each second CO ２ Calculate the amount of emissions, The differential emission calculation unit calculates the third CO ２ Emissions and each fourth CO ２ Calculate the amount of emissions, For each type of material, the third and fourth COs of products that use that type of material in their manufacture ２ The difference total CO for that type of material is calculated by adding up the total CO emissions. ２ a material-specific total emission calculation unit for calculating the emission amount; For each type of material, the difference total CO2 of the material of that type calculated by the material-by-material total emission calculation unit is calculated based on the ratio of the difference between the material amount and the product amount for the product that uses that type of material in its production. ２ a second allocation amount calculation unit that allocates the discharge amount, The carbon dioxide emission calculation system according to claim 2 .

6. The second allocation amount calculation unit further calculates the allocation CO ２ Emissions, the first CO of the target product ２ Emissions and the second CO ２ By summing up the emissions, the CO ２ Determine the amount of emissions, The carbon dioxide emission calculation system according to claim 5 .

7. CO2 emissions related to target products manufactured during a specified period at a factory capable of manufacturing multiple types of products that are manufactured from materials through multiple processes. ２ A carbon dioxide emission calculation method for calculating an emission amount, The materials include purchased raw materials and recycled raw materials obtained by recycling the difference between the amount of raw materials and the amount of products generated in the implementation of the process, a product component amount calculation step of calculating a first amount derived from the purchased raw materials and a second amount derived from the recycled raw materials out of the product amount of the target product; a difference component amount calculation step for calculating a third amount derived from the purchased raw materials and a fourth amount derived from the recycled raw materials among the target product difference amounts between the amount of materials used in the production of the target product and the product amount of the target product; CO per unit amount of the purchased raw material used in the production of the target product ２ The first CO is calculated by multiplying the discharge amount by the first amount calculated in the product component amount calculation step. ２ CO emissions per unit amount of the recycled raw materials used in the production of the target product ２ The second CO is calculated by multiplying the discharge amount by the second amount calculated in the product component amount calculation step. ２ a product discharge calculation step for calculating a discharge amount; CO per unit amount of the purchased raw material used in the production of the target product ２ The third CO 2 emission amount is calculated by multiplying the third amount calculated in the step of calculating the difference component amount. ２ CO emissions per unit amount of the recycled raw materials used in the production of the target product ２ The fourth CO ２ and a differential discharge amount calculation step for calculating a discharge amount. Carbon dioxide emissions calculation method.

8. A carbon dioxide emission calculation program for calculating the CO2 emissions for target products manufactured over a specified period in a factory capable of manufacturing multiple types of products that are manufactured from materials through multiple processes, the carbon dioxide emission calculation program causing a computer to function as a carbon dioxide emission calculation system described in any one of claims 1 to 6.

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