Carbon dioxide emission calculation system, method, and program

Abstract

To provide a carbon dioxide emissions calculation system capable of calculating CO2 emissions even when separation occurs; and to provide a method thereof and a program thereof.SOLUTION: Provided is a carbon dioxide emissions calculation system for calculating CO2 emissions related to target products manufactured during a prescribed period at a factory where products of a plurality of types can be manufactured through a plurality of processes starting from treating raw materials. The plurality of processes includes a specific process in which separated inventory considered to be in stock occurs when separation from a body occurs during treatment. In the system, separated inventory raw materials CO2 emissions α1 pertaining to the separated inventory, among raw materials CO2 emissions, is calculated; with regard to each of processes pertaining to the target products from an initial process to the specific process, in the process, separated inventory processes CO2 emissions α2, α3 and α4 pertaining to the separated inventory, among processes CO2 emissions pertaining to the process, are calculated; and the sum of the separated inventory raw materials CO2 emissions α1 and each of these CO2 emissions α2, α3 and α4 is calculated as separated inventory CO2 emissions αS.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 obtaining the CO2 emission amount of a product manufactured through a plurality of processes including a process in which a separated inventory item that is separated from the main body and stored as an inventory occurs during processing.

Background Art

[0002] In recent years, from the perspective of protecting the global environment and the like, attention has been paid to the amount of carbon dioxide emissions. Technologies related to such carbon dioxide emissions are disclosed, for example, in Patent Document 1.

[0003] The carbon traceability management system disclosed in Patent Document 1 includes a utility management means for recording and managing power received from external sources, the amount of heating and cooling received, the operating performance of the private power generation equipment, and the operating performance of the heating and cooling equipment; a material management means for recording and managing the usage performance of materials and raw materials; a facility management means for managing and recording the energy used by facility equipment during the manufacturing period; a manufacturing execution management means for managing the production performance of products; an emission calculation means for calculating greenhouse gas emissions from the performance recorded and managed by the utility management means, material management means, facility management means, and manufacturing execution management means; and the greenhouse gas emissions calculated by the emission calculation means as one unit of product during manufacturing. The carbon traceability management system includes an emission allocation means for allocating emissions to lots. Primary power equipment is classified as boilers, power receiving equipment, private power generation equipment, water supply equipment, etc. Power equipment that operates by receiving energy from the primary power equipment is classified as secondary power equipment, and non-power equipment that operates by receiving energy from the primary and secondary power equipment is classified as tertiary equipment. The emission allocation means allocates greenhouse gas emissions for product lots based on the usage status of tertiary equipment corresponding to product lots and the usage status of secondary equipment corresponding to product lots. The system also includes an emission management means for managing the greenhouse gas emissions allocated to the manufacturing lots as unique data for the manufacturing lots. This carbon traceability management system allocates greenhouse gas emissions from discarded manufacturing lots and cleaning operations as emissions to product lots according to certain rules. More specifically, greenhouse gas emissions generated by related cleaning operations and the production of discarded lots are apportioned based on the allocation policy. Under this allocation policy, waste lots, regardless of the manufacturing process for any item, will be allocated equally to each production lot of the same item manufactured within 60 hours, with each lot receiving 1 / 3 of the waste lot. Furthermore, if three or more lots of the same item are not manufactured within that time, the greenhouse gas emissions from the remaining waste lot at the end of that time will be allocated to the first production lot of the same item manufactured after that time. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 5097728 (Japanese Unexamined Patent Publication No. 2010-191832) [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] By the way, the carbon traceability management system disclosed in Patent Document 1 can manage CO2 emissions on a lot basis, but it cannot manage (calculate) the CO2 emissions of separated material that is generated when separated material is separated from the main body during processing, rather than on a lot basis.

[0006] This invention was made in view of the above 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 determine CO2 emissions even when separated inventory is generated that is separated from the main body during processing and stored. [Means for solving the problem]

[0007] As a result of various studies, the inventors have found that the above objective can be achieved by the present invention as follows. That is, a carbon dioxide emission calculation system according to one aspect of the present invention is a system for calculating the CO2 emissions of a target product manufactured over a predetermined period in a factory capable of manufacturing products of multiple types, which are manufactured from raw materials through multiple processes, wherein the multiple processes include as a specific process a process in which separated stock is generated, which is separated from the main body during processing and stored, and comprises a first emission calculation unit that calculates the CO2 emissions of the separated stock raw material related to the separated stock from the raw material CO2 emissions of the raw material, a second emission calculation unit that calculates the process CO2 emissions related to each of the multiple processes for manufacturing the target product from the first process to the specific process, and calculates the CO2 emissions of the separated stock process related to the separated stock from the calculated process CO2 emissions in that process, and a separated stock emission calculation unit that calculates the sum of the CO2 emissions of the separated stock raw material and the CO2 emissions of each separated stock process calculated for each of the processes from the first process to the specific process as the CO2 emissions of the separated stock. Preferably, in the carbon dioxide emission calculation system described above, the first emission calculation unit calculates the CO2 emissions of the separated stock raw material by multiplying the CO2 emissions of the raw material by the ratio of the amount of separated stock to the amount of raw material. Preferably, in the carbon dioxide emission calculation system described above, the second emission calculation unit calculates the CO2 emissions of the separated stock process for the process by multiplying the calculated process CO2 emissions for the process by the ratio of the amount of separated stock to the amount of processed material for the process.

[0008] This type of carbon dioxide emission calculation system calculates the CO2 emissions from the separated stock raw materials by summing the CO2 emissions from each separated stock process, calculated for each process from the first to a specific process. Therefore, it can calculate CO2 emissions even when separated materials, in this case separated stock, are produced.

[0009] In another embodiment, the carbon dioxide emission calculation system described above further comprises: a total process emission calculation unit that calculates the process CO2 emissions related to each of the multiple processes for manufacturing the target product, and calculates the total process CO2 emissions as the sum of the raw material CO2 emissions and the process CO2 emissions calculated for each of the multiple processes for manufacturing the target product; and a first product emission calculation unit that calculates the product CO2 emissions related to the target product by subtracting the calculated separated inventory CO2 emissions from the calculated total process CO2 emissions. Preferably, in the carbon dioxide emission calculation system described above, if there are multiple target products classified in the same way during the predetermined period, the system further includes an aggregation calculation unit, wherein the first emission calculation unit calculates the CO2 emissions of the separated stock raw materials for each of the multiple target products, the second emission calculation unit calculates the CO2 emissions of the separated stock process for each of the multiple target products, the separated stock emission calculation unit calculates the CO2 emissions of the separated stock for each of the multiple target products, the aggregation calculation unit calculates the sum of the CO2 emissions of each separated stock calculated for each of the multiple target products as the aggregated CO2 emissions of the separated stock, and calculates the sum of the CO2 emissions of each product calculated for each of the multiple target products as the aggregated CO2 emissions of the product. Preferably, in the carbon dioxide emission calculation system described above, the target products are metal products and are classified by their component composition. Preferably, in the carbon dioxide emission calculation system described above, the target products are classified by their product type name. Preferably, in the carbon dioxide emission calculation system described above, the target products are classified by their customer name.Preferably, in the carbon dioxide emission calculation system described above, if the plurality of processes include a plurality of specific processes, the first emission calculation unit calculates the CO2 emissions of the separated stock raw materials in each of the plurality of specific processes, the second emission calculation unit calculates the CO2 emissions of the separated stock process in each of the plurality of specific processes, the separated stock emission calculation unit calculates the CO2 emissions of the separated stock in each of the plurality of specific processes, and the first product emission calculation unit calculates the product CO2 emissions related to the target product by subtracting the CO2 emissions of the separated stock calculated for each of the plurality of specific processes from the total process CO2 emissions calculated.

[0010] Such a carbon dioxide emission calculation system can determine the product CO2 emissions related to the target product by subtracting the CO2 emissions of separated inventory from the total process CO2 emissions.

[0011] In another embodiment, the carbon dioxide emission calculation system described above further includes a first unit quantity calculation unit that determines the first unit of separated stock CO2 emissions, which is the CO2 emissions per unit quantity of the separated stock.

[0012] Such a carbon dioxide emission calculation system can determine the first unit of separated stock CO2 emissions, which is the CO2 emissions per unit quantity of separated stock.

[0013] In another embodiment, the carbon dioxide emission calculation system described above further includes a second unit quantity calculation unit that determines the second unit of CO2 emissions, which is the CO2 emissions per unit quantity of a plurality of separated stocks, when there are a plurality of separated stocks classified in the same way during the predetermined period.

[0014] Such a carbon dioxide emission calculation system can determine the second unit of separated inventory CO2 emissions, which is the CO2 emissions per unit quantity for multiple separated inventory items classified under the same category.

[0015] In another embodiment, the carbon dioxide emission calculation system further includes a utilized separated stock emission calculation unit that, when there are multiple separated stocks classified in the same way during a predetermined period, calculates the CO2 emissions related to the separated stocks used as product materials from among the multiple separated stocks as utilized separated stock CO2 emissions.

[0016] Such a carbon dioxide emission calculation system can determine the CO2 emissions related to the separated stock materials used as product materials (CO2 emissions from used separated stock materials).

[0017] In another embodiment, the carbon dioxide emission calculation system described above includes a total process emission calculation unit that calculates the process CO2 emissions for each of the multiple processes for manufacturing the target product, and calculates the total process CO2 emissions as the sum of the raw material CO2 emissions and the process CO2 emissions calculated for each of the multiple processes for manufacturing the target product, and when there are multiple separated stocks classified in the same way over a predetermined period, the calculation calculates the amount of the multiple separated stocks that can be used as product materials relative to the first total amount of the multiple separated stocks. The system further includes a product emission recalculation unit that calculates a disposal rate, which is the ratio of the second total amount of separated inventory excluding the separated inventory items that have been disposed of, or a utilization rate, which is the ratio of the third total amount of separated inventory items used as product materials to the first total amount of the multiple separated inventory items, and then calculates the product CO2 emissions related to the target product by subtracting from the calculated total process CO2 emissions the result of multiplying the calculated separated inventory CO2 emissions by (1 - the disposal rate), or the result of multiplying the calculated separated inventory CO2 emissions by the utilization rate.

[0018] Such a carbon dioxide emission calculation system can recalculate the product CO2 emissions related to the target product, thereby allocating the CO2 emissions of the separated inventory (excluding the separated inventory used as product materials) to the product CO2 emissions related to the target product.

[0019] In another embodiment, in the carbon dioxide emission calculation system described above, when a product is manufactured using the separated inventory as a product material, the CO2 emissions from the separated inventory are used as the raw material CO2 emissions to determine the product CO2 emissions related to the product. Herein, the carbon dioxide emission calculation system further includes a second product emission calculation unit that, if the multiple processes for manufacturing the product do not include the specific process, determines the process CO2 emissions related to each of the multiple processes for manufacturing the product, and calculates the sum of the raw material CO2 emissions and the process CO2 emissions determined for each of the multiple processes for manufacturing the product as the product process CO2 emissions.

[0020] Such a carbon dioxide emission calculation system can determine the product CO2 emissions related to a product when a product is manufactured using separated stock as a product material, by using the CO2 emissions of the separated stock as the CO2 emissions of the raw material.

[0021] Another embodiment of the present invention relates to a carbon dioxide emission calculation method for determining the CO2 emissions of a target product manufactured over a predetermined period in a factory capable of manufacturing multiple types of products from raw materials through multiple processes, wherein the multiple processes include a specific process that generates separated stock materials that are separated from the main body during processing and stored, and comprises: a first emission calculation step of determining the separated stock material raw material CO2 emissions related to the separated stock materials from the raw material CO2 emissions of the raw materials; a second emission calculation step of determining the process CO2 emissions related to each of the multiple processes for manufacturing the target product from the first process to the specific process, and determining the separated stock material process CO2 emissions related to the separated stock materials in that process from the determined process CO2 emissions; and a separated stock material emission calculation step of determining the separated stock material CO2 emissions as the sum of the separated stock material raw material CO2 emissions and the separated stock material process CO2 emissions determined for each of the processes from the first process to the specific process.

[0022] Such a carbon dioxide emission calculation method obtains the carbon dioxide emission of separated inventory items by summing the carbon dioxide emissions of the separated inventory item raw materials and the carbon dioxide emissions of each separated inventory item process determined for each process from the first process to a specific process. Therefore, even when a separated product, here a separated inventory item, occurs, the carbon dioxide emissions can be determined.

[0023] The carbon dioxide emission calculation program according to another aspect of the present invention is a program for obtaining the CO2 emissions related to a target product of a target type manufactured in a factory capable of manufacturing a plurality of types of products through a plurality of processes from raw materials during a predetermined period, and is a program for causing a computer to function as any of the above-described carbon dioxide emission calculation systems.

[0024] According to this, a carbon dioxide emission calculation program can be provided, and this carbon dioxide emission calculation program exhibits the same operational effects as the above-described carbon dioxide emission calculation systems.

Advantages of the Invention

[0025] The carbon dioxide emission calculation system, carbon dioxide emission calculation method, and carbon dioxide emission calculation program according to the present invention can determine the CO2 emissions even when separated inventory items occur.

Brief Description of the Drawings

[0026] [Figure 1] It is a diagram for explaining the outline of the carbon dioxide emission calculation system in the embodiment. [Figure 2] It is a diagram showing the configuration of the carbon dioxide emission calculation system. [Figure 3] As an example, it is a diagram for explaining product information. [Figure 4] As an example, it is a diagram showing a unit CO2 emission information table. [Figure 5] It is a flowchart showing the operation of the carbon dioxide emission calculation system. [Figure 6]As an example, this diagram illustrates how to calculate the CO2 emissions from separated inventory for product "P001" and product "P002". [Figure 7] As an example, this diagram illustrates how to calculate the CO2 emissions from separated inventory for product "P003" and product "P100," respectively. [Figure 8] As an example, this is a diagram illustrating how to calculate product CO2 emissions. [Figure 9] As an example, this diagram illustrates the calculation method for aggregated separated inventory CO2 emissions, as well as the CO2 emissions of the first and second unit separated inventory. [Figure 10] As an example, this is a diagram illustrating how the disposal rate is calculated. [Figure 11] As an example, this is a diagram illustrating how to recalculate product CO2 emissions. [Figure 12] As an example, this diagram illustrates product information when separated inventory items are used as product materials. [Figure 13] As an example, this diagram illustrates how to calculate product CO2 emissions when separated inventory materials are used as product raw materials. [Figure 14] As an example, this diagram illustrates how to calculate the CO2 emissions of separated inventory in a case where there are multiple specific processes. [Modes for carrying out the invention]

[0027] 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 each figure, components denoted by the same reference numerals are identified as identical components, and their descriptions are omitted where appropriate. In this specification, general reference numerals are used without subscripts, while individual components are indicated by subscripts.

[0028] Figure 1 is a diagram illustrating the overview of a carbon dioxide emission calculation system in an embodiment. The carbon dioxide emission calculation system in the embodiment is a system that determines the carbon dioxide emissions (CO2 emissions) of a target product manufactured over a predetermined period in a factory (plant) capable of manufacturing multiple types of products from raw materials through multiple processes. This carbon dioxide emission calculation system includes, as a specific process, a process in which separated stock material is generated, which is separated from the main body during processing and kept as inventory. The system comprises a first emission calculation unit, a second emission calculation unit, and a separated stock material emission calculation unit. In Figure 1, the cutting process in process 4 is an example of the specific process. In Figure 1, raw materials and shipment are each depicted as one of the processes, with process 1 representing raw materials and process 7 representing shipment. The first emission calculation unit determines the separated stock material raw material CO2 emissions α1 related to the separated stock material from the raw material CO2 emissions of the raw materials. The second emission calculation unit calculates the CO2 emissions for each of the processes from the first process to the specific process among the multiple processes for manufacturing the target product, and from the calculated process CO2 emissions, it calculates the CO2 emissions α2, α3, and α4 related to the separated inventory in that process. The separated inventory emission calculation unit calculates the CO2 emissions α1 of the separated inventory raw material and the CO2 emissions α2, α3, and α4 of the separated inventory processes calculated for each of the processes from the first process to the specific process as the CO2 emissions of the separated inventory αS (= α1 + α2 + α3 + α4).

[0029] The following provides a more detailed explanation of this carbon dioxide emission calculation system, as well as the carbon dioxide emission calculation method and carbon dioxide emission calculation program implemented therein. Here, as an example, we will explain using a factory (plant) capable of manufacturing various types of rolled steel sheets. However, the factory (plant) can be any type as long as it is capable of manufacturing products of multiple types, which are produced through multiple processes, including processes that generate separated inventory, which is separated from the main product during processing and becomes inventory. The separated inventory is the material that is lost during the execution of the process and does not constitute the product, and is further made into inventory. For example, it is scraps or pieces generated by cutting off parts that do not meet quality or dimensional standards. Separated inventory is a sub-concept of separated material. The so-called yield is determined by the amount of separated material (yield loss, yield loss, for example, weight of separated material (yield loss weight) or volume of separated material (yield loss volume)). Yield is generally defined as the ratio of the amount of finished product to the amount of raw materials used, while yield drop is the opposite of yield, and is the ratio of the amount of loss (loss) incurred from raw materials to finished product to the amount of raw materials used.

[0030] A carbon dioxide emission calculation system may be configured by connecting an input / output terminal device for inputting and outputting data, one or more processing units (e.g., a server device) for performing various calculations, and one or more database devices for storing (managing) various data in a manner that allows them to communicate with each other. At least some of these input / output terminal devices, one or more processing units, and one or more database devices may be configured as a single unit and connected to the rest in a manner that allows them to communicate with each other. However, here we will explain a carbon dioxide emission calculation system using a carbon dioxide emission calculation system in which all components are integrated as an example.

[0031] Figure 2 shows the configuration of the carbon dioxide emission calculation system (a carbon dioxide emission calculation device as an example). Figure 3 is a diagram illustrating product information as an example. Figure 4 is a diagram showing a unit CO2 emission information table as an example.

[0032] The carbon dioxide emission calculation system (carbon dioxide emission calculation device as an example) 1000 in this embodiment includes, for example, a control processing unit 1, an input unit 2, an output unit 3, an interface unit (IF unit) 4, and a storage unit 5, as shown in Figure 2.

[0033] The input unit 2 is connected to the control processing unit 1 and is a device that inputs various commands to the carbon dioxide emission calculation device 1000, such as a command to instruct the start of CO2 emission calculation, and various data necessary for operating the carbon dioxide emission calculation device 1000, such as the product manufacturing process and product manufacturing results. For example, it may be a keyboard, a mouse, or multiple input switches assigned to predetermined functions. The output unit 3 is connected to the control processing unit 1 and is a device that outputs commands, data, and calculation results input from the input unit 2 according to the control of the control processing unit 1. For example, it may be a display device such as a CRT display, LCD (liquid crystal display device), or organic EL display, or a printing device such as a printer.

[0034] The input unit 2 and output unit 3 may be configured as touch panels. In this configuration, the input unit 2 is a position input device that detects and inputs the operating position, such as a resistive or capacitive touch panel, and the output unit 3 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 candidate input contents that can be input to the display device are displayed. When the user touches the display position that displays the input content they wish to input, the position input device detects that position, 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. With such a touch panel, the user can easily understand the input operation intuitively, thus providing a carbon dioxide emission calculation device 1000 that is easy for the user to use.

[0035] The IF unit 4 is connected to the control processing unit 1 and, in accordance with the control of the control processing unit 1, is a circuit that inputs and outputs data to and from external devices, for example. Examples include an RS-232C serial communication interface circuit, an interface circuit using the Bluetooth® standard, and an interface circuit using the USB standard. Alternatively, the IF unit 4 may be a communication interface circuit that sends and receives communication signals to and from external devices, such as a data communication card or a communication interface circuit conforming to the IEEE 802.11 standard.

[0036] The memory unit 5 is connected to the control processing unit 1 and is a circuit that stores various predetermined programs and various predetermined data in accordance with the control of the control processing unit 1.

[0037] The various predetermined programs mentioned above include, for example, a control processing program, which includes, for example, a control program, a first emission calculation program, a second emission calculation program, a separated inventory emission calculation program, a total process emission calculation program, a first product emission calculation program, an aggregation calculation program, a first unit quantity calculation program, a second unit quantity calculation program, a utilized separated inventory emission calculation program, a product emission recalculation program, and a second product emission calculation program. The control program is a program that controls each of the parts 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each part. The first emission calculation program is a program that determines the separated inventory raw material CO2 emission amount related to separated inventory among the raw material CO2 emissions of the raw materials in the target product. The second emission calculation program is a program that, for each of the multiple processes for manufacturing the target product from the first process to a specific process, determines the process CO2 emission amount related to that process, and from the determined process CO2 emission amount, determines the separated inventory process CO2 emission amount related to the separated inventory in that process. The separated inventory emission calculation program calculates the separated inventory CO2 emission by adding the separated inventory raw material CO2 emission calculated by the first emission calculation program and the separated inventory process CO2 emission calculated by the second emission calculation program for each process from the first process to a specific process. The total process emission calculation program calculates the process CO2 emission for each of the multiple processes for manufacturing the target product, and calculates the total process CO2 emission by adding the raw material CO2 emission and the process CO2 emission calculated for each of the multiple processes for manufacturing the target product. The first product emission calculation program calculates the product CO2 emission related to the target product by subtracting the separated inventory CO2 emission calculated by the separated inventory emission calculation program from the total process CO2 emission calculated by the total process emission calculation program.The aggregation calculation program calculates the sum of the CO2 emissions of each isolated inventory item calculated for each of the multiple target products as the aggregated isolated inventory CO2 emissions when there are multiple target products over a predetermined period, and calculates the sum of the CO2 emissions of each of the multiple target products as the aggregated product CO2 emissions. The first unit quantity calculation program calculates the first unit isolated inventory CO2 emissions, which are the CO2 emissions per unit quantity of isolated inventory. The second unit quantity calculation program calculates the second unit isolated inventory CO2 emissions, which are the CO2 emissions per unit quantity of multiple isolated inventory items, when there are multiple isolated inventory items classified in the same category over a predetermined period. The utilization isolated inventory emission calculation program calculates the CO2 emissions of the isolated inventory items used as product materials, when there are multiple isolated inventory items classified in the same category over a predetermined period. The product emission recalculation program calculates, in the case of multiple separated stock items classified in the same category over a predetermined period, a disposal rate which is the ratio of a second total amount of separated stock items (excluding those used as product materials) to a first total amount of separated stock items, or a utilization rate which is the ratio of a third total amount of separated stock items (including those used as product materials) to a first total amount of separated stock items, and then calculates the product CO2 emissions related to the target product by subtracting from the calculated total process CO2 emissions the result of multiplying the calculated separated stock CO2 emissions by (1 - the disposal rate), or the result of multiplying the calculated separated stock CO2 emissions by the utilization rate. The second product emission calculation program, when a specific process is not included in the multiple processes for manufacturing a product, calculates the process CO2 emissions for each of the multiple processes for manufacturing the product, and calculates the sum of the raw material CO2 emissions and the individual process CO2 emissions calculated for each of the multiple processes for manufacturing the product as the product process CO2 emissions.

[0038] The aforementioned various predetermined data include, for example, product information, unit emission information, various calculation results during the calculation process, and final calculation results, which are all data necessary for executing these programs.

[0039] Such a storage unit 5 may include, for example, a non-volatile memory element such as ROM (Read Only Memory) or a rewritable non-volatile memory element such as EEPROM (Electrically Erasable Programmable Read Only Memory). Furthermore, the storage unit 5 includes RAM (Random Access Memory) which serves as the working memory of the control processing unit 1, storing data generated during the execution of the predetermined program. The storage unit 5 may also be configured to include a hard disk drive with a relatively large storage capacity.

[0040] The storage unit 5 is functionally equipped with a product information storage unit 51 and a unit emission information storage unit 52, respectively, for storing product information and unit emission information.

[0041] The product information storage unit 51 stores product information. The product information is information relating to a product, and as shown in Figure 3, for example, it is stored for each product and includes raw material information 101 relating to the raw materials used to manufacture the product, manufacturing process information 102 relating to multiple processes for manufacturing the product, and product manufacturing performance information 103 relating to products manufactured during a predetermined period.

[0042] The raw material information includes the name of the raw material used to manufacture the product of the product name, and the unit raw material CO2 emission amount, which is the amount of CO2 emitted per unit quantity of the raw material of the product name. These are stored in the product information storage unit 51 in association with the product name. The unit raw material CO2 emission amount is the amount of carbon dioxide emitted in relation to the raw material, for example, the amount of CO2 emitted in the production of the raw material. In this embodiment, the raw material is considered as one of the processes, and the unit raw material CO2 emission amount is stored in the unit emission information storage unit 52, as will be described later.

[0043] The aforementioned manufacturing process information is information that describes multiple processes for manufacturing the product of the product name in the order of the processes, and these multiple processes described in the order of the processes are associated with the product name and stored in the product information storage unit 51. Each process is represented by a process name, which is the name of the process.

[0044] The product manufacturing performance information includes the production volume (product volume, actual production volume, actual product volume) of the product with the product name manufactured during a predetermined period, and the production volume is stored in the product information storage unit 51 in association with the product name. The product manufacturing performance information also includes the processing volume of each processed material processed at each process. The predetermined period is arbitrary and can be set in advance as appropriate, for example, 3 months, 6 months (half a year), or 1 year.

[0045] In this embodiment, the product is a rolled steel sheet, which is an example of a metal product, as described above. The type of rolled steel sheet (type of product) can be classified, for example, by its component composition. Therefore, the target product is, for example, a metal product, and is classified by its component composition (in other words, by its type name). The target product may also be classified by the name of the product's end-user.

[0046] The unit emission information storage unit 52 stores unit emission information. The unit emission information is the amount of CO2 emitted during the execution of the process, and in this embodiment, it is expressed as, for example, the unit CO2 emission, which is the amount of CO2 emitted per unit quantity. In this embodiment, the unit quantity is the weight of the processed material (processing target, (processing material) = (main body) + (separated inventory)) processed during the execution of the process, but is not limited to this, and may be, for example, the volume of the processed material, or the processing time required to execute the process.

[0047] In this embodiment, the unit emission information is stored in a table format in the unit emission information storage unit 52. The unit emission information table 200, which registers this unit emission information, includes, for example, a process name field 201 for registering process names and a unit CO2 emission field 202 for registering the unit CO2 emission (unit process CO2 emission) [tCO2 / ton] for the process of the process name registered in the process name field 201, and has a record for each process name. In this embodiment, as described above, raw materials are considered to be one of the processes, so the unit emission information table 200 registers the unit raw material CO2 emission. In this embodiment, although shipping is not directly involved in the manufacturing of the product, shipping is also included as one of the processes, and the unit CO2 emission of shipping (unit shipment CO2 emission) is registered as the unit process CO2 emission in the unit emission information table 200. Note that shipping does not have to be included as one of the processes.

[0048] The control processing unit 1 is a circuit that controls each of the parts 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each part, and calculates the CO2 emissions related to the target product manufactured during a predetermined period. The control processing unit 1 is configured, for example, with a CPU (Central Processing Unit) and its peripheral circuits. When the control processing program is executed, the control processing unit 1 is functionally configured to include a control unit 11, a first emission calculation unit 12, a second emission calculation unit 13, a separated inventory emission calculation unit 14, a total process emission calculation unit 15, a first product emission calculation unit 16, an aggregation calculation unit 17, a first unit quantity calculation unit 18, a second unit quantity calculation unit 19, a utilization separated inventory emission calculation unit 20, a product emission recalculation unit 21, and a second product emission calculation unit 22.

[0049] The control unit 11 controls each of the parts 2 to 5 of the carbon dioxide emission calculation device 1000 according to the function of each part, and is in charge of the overall control of the carbon dioxide emission calculation device 1000.

[0050] The first emission calculation unit 12 determines the CO2 emissions from the separated stock materials, which are part of the CO2 emissions from the raw materials in the target product. More specifically, the first emission calculation unit 12 determines the CO2 emissions from the separated stock materials by multiplying the CO2 emissions from the raw materials by the ratio of the amount of separated stock materials to the amount of raw materials.

[0051] The second emission calculation unit 13 calculates the CO2 emissions for each of the multiple processes for manufacturing the target product, from the first process to a specific process, and then calculates the CO2 emissions for the separated inventory related to that process from the calculated process CO2 emissions. More specifically, the second emission calculation unit 13 calculates the CO2 emissions for the separated inventory related to that process by multiplying the calculated process CO2 emissions for that process by the ratio of the amount of separated inventory to the amount of material processed in that process.

[0052] The separated inventory emission calculation unit 14 calculates the separated inventory CO2 emission as the sum of the separated inventory raw material CO2 emission calculated by the first emission calculation unit 12 and the separated inventory process CO2 emission calculated by the second emission calculation unit 13 for each process from the first process to a specific process.

[0053] The total process emissions calculation unit 15 calculates the process CO2 emissions for each of the multiple processes involved in manufacturing the target product, and calculates the total process CO2 emissions as the sum of the raw material CO2 emissions and the individual process CO2 emissions calculated for each of the multiple processes involved in manufacturing the target product.

[0054] The first product emission calculation unit 16 calculates the product CO2 emissions related to the target product by subtracting the separated inventory CO2 emissions calculated by the separated inventory emission calculation unit 14 from the total process CO2 emissions calculated by the total process CO2 emissions calculation unit 15.

[0055] The aggregation calculation unit 17, when there are multiple target products over a predetermined period, calculates the sum of the CO2 emissions of each separated inventory product calculated for each of the multiple target products as the aggregated CO2 emissions of the separated inventory product, and calculates the sum of the CO2 emissions of each of the multiple target products as the aggregated CO2 emissions of the product.

[0056] The first unit quantity calculation unit 18 determines the first unit of separated inventory CO2 emissions, which is the CO2 emissions per unit quantity of separated inventory.

[0057] The second unit quantity calculation unit 19 determines the second unit of separated stock CO2 emissions, which is the CO2 emissions per unit quantity for multiple separated stock items, when there are multiple separated stock items classified in the same way over a predetermined period.

[0058] The CO2 emissions calculation unit 20 for used separated inventory calculates the CO2 emissions related to the separated inventory used as product materials when there are multiple separated inventory items classified in the same way over a predetermined period.

[0059] The product emission recalculation unit 21, when there are multiple separated stock items classified in the same category over a predetermined period, calculates a disposal rate, which is the ratio of a second total amount of separated stock items (excluding those used as product materials) to a first total amount of separated stock items. It then recalculates the product CO2 emissions related to the target product by subtracting the result of multiplying the calculated separated stock CO2 emissions by (1 - the disposal rate) from the calculated total process CO2 emissions. The product emission recalculation unit 21 may also calculate a utilization rate, which is the ratio of a third total amount of separated stock items (excluding those used as product materials) to a first total amount of separated stock items over a predetermined period, and then recalculates the product CO2 emissions related to the target product by subtracting the result of multiplying the calculated separated stock CO2 emissions by the utilization rate from the calculated total process CO2 emissions.

[0060] The second product emission calculation unit 22, when a specific process is not included in the multiple processes for manufacturing the product, calculates the process CO2 emissions related to each of the multiple processes for manufacturing the product, and calculates the sum of the raw material CO2 emissions and the process CO2 emissions calculated for each of the multiple processes for manufacturing the product as the product process CO2 emissions.

[0061] In a carbon dioxide emission calculation device 1000, which is an example of a carbon dioxide emission calculation system, the control processing unit 1, input unit 2, output unit 3, IF unit 4, and storage unit 5 can be configured by computers such as desktop or notebook computers. Of course, as mentioned above, the carbon dioxide emission calculation system may be configured by multiple computers that are connected in a communicative manner.

[0062] Next, the operation of this embodiment will be described. Figure 5 is a flowchart illustrating the operation of the carbon dioxide emission calculation system. Figure 6 is a diagram illustrating the calculation method for the CO2 emissions of separated inventory for product "P001" and product "P002" as an example. Figure 6A shows the case for product "P001", and Figure 6B shows the case for product "P002". Figure 7 is a diagram illustrating the calculation method for the CO2 emissions of separated inventory for product "P003" through product "P100" as an example. Figure 7A shows the case for product "P003", and Figure 7B shows the case for product "P100". Note that in the examples shown in Figures 6 and 7, there are 100 products from product name "P001" to product name "P100", but the cases for products from product name "P004" to product name "P099" are omitted. Figure 8 is a diagram illustrating, as an example, the calculation method for product CO2 emissions. Figure 9 is a diagram illustrating, as an example, the calculation method for aggregated separated inventory CO2 emissions, as well as the CO2 emissions for first and second unit separated inventory CO2 emissions. Figure 10 is a diagram illustrating, as an example, the calculation method for the disposal rate. Figure 11 is a diagram illustrating, as an example, the recalculation method for product CO2 emissions.

[0063] When the carbon dioxide emission calculation device 1000 with this configuration is powered on, it performs the initialization of each necessary part and starts operating. The control processing unit 1 is functionally configured by the execution of its control processing program to include a control unit 11, a first emission calculation unit 12, a second emission calculation unit 13, a separated inventory emission calculation unit 14, a total process emission calculation unit 15, a first product emission calculation unit 16, an aggregation calculation unit 17, a first unit quantity calculation unit 18, a second unit quantity calculation unit 19, a utilization separated inventory emission calculation unit 20, a product emission recalculation unit 21, and a second product emission calculation unit 22.

[0064] When the operator (user) instructs the input unit 2 to start calculations at a time after the point in time when the disposal rate (or utilization rate) can be calculated (for example, at the end of the predetermined period), the carbon dioxide emission calculation device 1000, using the first emission calculation unit 12 of the control processing unit 1, calculates the CO2 emissions of the separated stock material related to the CO2 emissions of the raw materials in the target product and stores it in the storage unit 5 (S1). More specifically, the first emission calculation unit 12 calculates the CO2 emissions of the separated stock material by multiplying the CO2 emissions of the raw materials by the ratio of the amount of separated stock material (amount of separated stock material) to the amount of raw materials ((CO2 emissions of separated stock material) = (CO2 emissions of raw materials) × (amount of separated stock material) / (amount of raw materials)). The CO2 emissions of the raw materials are obtained by multiplying the amount of raw materials by the unit amount of raw materials ((CO2 emissions of raw materials) = (CO2 emissions of unit raw materials) × (amount of raw materials)).

[0065] Here, we will explain the operation in detail using the example of a case where there are multiple target products, more specifically, a case where there are multiple target products classified under the same category. More specifically, we will assume that the product information storage unit 51 stores the product information shown in Figure 3. The weight of a process is the weight of the processed material processed in this process, and the weight difference with the next process is the weight of the separated material separated from the main body during processing in this process. For example, product name "P001" goes through the following processes: process 1 "raw material", process 2 "melting and casting", process 3 "extrusion 1", process 4 "cutting", process 5 "heat treatment", and process 6 "shipping". Process 4 "cutting" is a specific process, and the separated material from this process becomes inventory, thus becoming separated inventory. The weights in each of these first to sixth processes are 26 tons, 25 tons, 24 tons, 24 tons, 16 tons, and 16 tons, respectively. For example, in the second process, the weight of the material processed in the second process is 25 tons, and the weight of the material processed in the next third process is 24 tons, so the weight of the separated material in the second process is the difference, 1 ton. In the fourth process, the weight of the material processed in the fourth process is 24 tons, and the weight of the material processed in the next fifth process is 16 tons, so the weight of the separated inventory in the specific fourth process is the difference, 8 tons. On the other hand, there is no weight difference between the third process and the following fourth process, so there is no separated material in the third process. The unit discharge information storage unit 52 stores the unit discharge information table 200 shown in Figure 4 as the unit discharge information.

[0066] In these examples, Figures 6 and 7 show that in the record for the first process of the process named "Raw Materials," the CO2 emissions from the separated stock raw materials are listed in the rightmost column when viewed from the front. For example, in Figure 6A, in the record for the first process of the process named "Raw Materials," the CO2 emissions from the separated stock raw materials, "32" [tCO2] (=104 × (8 / 26)), which is calculated by multiplying the raw material CO2 emissions of "104" [tCO2] (=4 × 26) by the ratio of the amount of separated stock to the amount of raw materials, "26" [tons], is listed in the rightmost column when viewed from the front.

[0067] Next, the carbon dioxide emission calculation device 1000, using the second emission calculation unit 13 of the control processing unit 1, calculates the process CO2 emissions for each of the multiple processes for manufacturing the target product, from the first process to the specific process, and from the calculated process CO2 emissions, calculates the separated inventory process CO2 emissions related to the separated inventory in that process, and stores them in the storage unit 5 (S2). More specifically, in this embodiment, as will be described later, the total process CO2 emissions are calculated, so the second emission calculation unit 13 calculates the process CO2 emissions for each of the multiple processes for manufacturing the target product by multiplying the processing amount of the processed material in that process by the unit process CO2 emissions in that process. Then, the second emission calculation unit 13 calculates the CO2 emissions for each process from the first process to a specific process by multiplying the process CO2 emissions for that process by the ratio of the amount of separated inventory to the amount of processed material for that process ((CO2 emissions for separated inventory process) = (CO2 emissions for process) × (amount of separated inventory) / (amount processed)).

[0068] In the examples described above, Figures 6 and 7 show that in each record for each of the second through sixth processes, the CO2 emissions for each process are listed in the third column from the right in the front view. For example, in Figure 6A, the record for the second process, named "Melting and Casting," shows the process CO2 emissions of "37.5" [tons] (=25 × 1.5), calculated by multiplying the weight of the material processed in the second process, "25" [tons], by the unit process CO2 emissions of "1.5" [tons], in the third column from the right in the front view. Furthermore, in the record for the second process, named "Melting and Casting," the CO2 emissions for the separated inventory process, "12" [tons] (=37.5 × (8 / 25)), calculated by multiplying this process CO2 emissions of the second process, "37.5" [tCO2], by the ratio of the amount of separated inventory, "8" [tons], to the amount of material processed in the second process, "25" [tons], is listed in the rightmost column in the front view.

[0069] Next, the carbon dioxide emission calculation device 1000, using the separated inventory emission calculation unit 14 of the control processing unit 1, calculates the separated inventory CO2 emission amount as the sum of the separated inventory raw material CO2 emission amount obtained by the first emission calculation unit 12 in process S1 and the separated inventory process CO2 emission amount obtained by the second emission calculation unit 13 in process S2 for each process from the first process to the specific process, and stores this sum in the storage unit 5 (S3).

[0070] In the examples described above, the total column on the far right in the front view of Figures 6 and 7 shows the CO2 emissions from the separated stock. For example, in the total column on the far right in the front view of Figure 6A, the CO2 emissions from the separated stock raw material "32" [tCO2] and the CO2 emissions from each separated stock process, calculated for each process from the first second process to the fourth specific process for manufacturing product "P001" (the target product), are listed as "52" [tCO2] (=32+12+6.4+1.6), which is the sum of these CO2 emissions from the separated stock.

[0071] Next, the carbon dioxide emission calculation device 1000, using the total process emission calculation unit 15 of the control processing unit 1, determines the process CO2 emissions for each of the multiple processes for manufacturing the target product, and calculates the total process CO2 emissions as the sum of the raw material CO2 emissions and the individual process CO2 emissions calculated for each of the multiple processes for manufacturing the target product, and stores this in the storage unit 5 (S4). In this embodiment, as described above, the individual process CO2 emissions for each process are determined in process S2, so more specifically, the total process emission calculation unit 15 calculates the total process CO2 emissions as the sum of the raw material CO2 emissions and the individual process CO2 emissions calculated for each of the multiple processes for manufacturing the target product, and stores this in the storage unit 5.

[0072] In the example above, the total CO2 emissions for the entire process are listed in the "Total" column, the third column from the right in the front view of both Figure 6 and Figure 7. For example, in the "Total" column, the third column from the right in the front view of Figure 6A, the raw material CO2 emissions "104" [tCO2] and the CO2 emissions for each of the second through sixth processes for manufacturing product "P001" (the target product) are "37.5" [tCO2], "19.2" [tCO2], "4.8" [tCO2], "16" [tCO2], and "0.8" [tCO2]. The sum of these, "182.3" [tCO2] (=104+37.5+19.2+4.8+16+0.8), is listed as the total process CO2 emissions.

[0073] Next, the carbon dioxide emission calculation device 1000, using the first product emission calculation unit 16 of the control processing unit 1, calculates the product CO2 emission (initial product CO2 emission) related to the target product by subtracting the separated inventory CO2 emission calculated by the separated inventory emission calculation unit 14 in process S4 from the total process CO2 emission calculated by the total process emission calculation unit 15 in process S4, and stores it in the storage unit 5 (S5).

[0074] In the example above, Figure 8 shows that for each product, from product name "P001" to product name "P100", the CO2 emissions for each product are listed in the rightmost column when viewed from the front. For example, in the record for product name "P001", the product CO2 emissions for product name "P001", "130.3" [tCO2] (=182.3-52), which is calculated by subtracting the separated inventory CO2 emissions "52" [tCO2] from the total process CO2 emissions "182.3" [tCO2], is listed in the rightmost column when viewed from the front.

[0075] Next, the carbon dioxide emission calculation device 1000, using the control processing unit 1, determines whether each calculation in each process S1 to S5 has been performed for all target products (S6). If the result of this determination is that the calculations have not been performed for all target products (No), the carbon dioxide emission calculation device 1000 returns to process S1 in order to perform the calculations for the target products for which the calculations have not been performed. On the other hand, if the result of the above determination is that the calculations have been performed for all target products (Yes), the carbon dioxide emission calculation device 1000 then executes process S7.

[0076] In the example above, each of the operations S1 to S5 is performed for each product, from product name "P001" to product name "P100", and the results of the operations shown in Figures 6 to 8 are obtained.

[0077] In the process S7 described above, the carbon dioxide emission calculation device 1000, when there are multiple target products classified in the same category, calculates the sum of the CO2 emissions of each separated inventory product calculated for each of the multiple target products as the aggregated CO2 emissions of the separated inventory product and stores it in the storage unit 5, and calculates the sum of the CO2 emissions of each product calculated for each of the multiple target products as the aggregated CO2 emissions of the product and stores it in the storage unit 5.

[0078] In the example above, each product named "P001" through "P100" is a group of products classified under the same category "H1". The total CO2 emissions from each separated inventory for each product named "P001" through "P100" are calculated as follows: "52" [tCO2], "65" [tCO2], "37.8" [tCO2], ..., "25.2" [tCO2]. The total product CO2 emissions are calculated by determining the sum of the individual product CO2 emissions for each product named "P001" or "P100": "130.3" [tCO2] (=182.3-52), "144.2" [tCO2] (=209.2-65), "87.4" [tCO2] (=125.2-37.8), ..., "125.1" [tCO2] (=150.3-25.2).

[0079] Next, the carbon dioxide emission calculation device 1000 uses the first unit quantity calculation unit 18 of the control processing unit 1 to determine the first unit of separated inventory CO2 emissions, which is the CO2 emissions per unit quantity of the separated inventory, and stores it in the storage unit 5. The second unit quantity calculation unit 19 of the control processing unit 1, if there are multiple separated inventory items classified in the same way during the predetermined period, determines the second unit of separated inventory CO2 emissions, which is the CO2 emissions per unit quantity of the multiple separated inventory items, and stores it in the storage unit 5 (S8).

[0080] In the example described above, Figure 9 shows that for each product named "P001" through "P100", the CO2 emissions of the first unit of isolated inventory are listed in the rightmost column in the front view, and the total column shows the CO2 emissions of the second unit of isolated inventory for each of these products. For example, in the record for product name "P001", the CO2 emissions of the first unit of separated inventory, "6.5" [tCO2 / ton] (=52 / 8), which is calculated by dividing the CO2 emissions of the separated inventory "52" [tCO2] by the quantity of separated inventory "8" [ton], is listed in the rightmost column when viewed from the front. In the total column, the CO2 emissions of the second unit of separated inventory, "6.2" [tCO2 / ton] (=3534 / 570), which is calculated by dividing the aggregated CO2 emissions of the separated inventory "3534" [tCO2] by the aggregated quantity of separated inventory "570" [ton], which is the sum of the quantities of each separated inventory item classified in the same category, is listed.

[0081] Next, the carbon dioxide emission calculation device 1000, using the utilization separation inventory emission calculation unit 20 of the control processing unit 1, calculates the CO2 emissions related to the separation inventory used as product materials among the multiple separation inventory items when there are multiple separation inventory items classified in the same way during the predetermined period, and stores it in the storage unit 5 (S9).

[0082] In the example above, if the isolated stock generated during the manufacture of each product named "P001" to "P003" is used as a product material, the sum of the CO2 emissions from each isolated stock generated during the manufacture of each product named "P001" to "P003" is "52" [tCO2], "65" [tCO2], and "37.8" [tCO2], which is "154.8" [tCO2] (= 52 + 65 + 37.8), and this can be calculated as the CO2 emissions from the utilized isolated stock.

[0083] Next, the carbon dioxide emission calculation device 1000, using the product emission recalculation unit 21 of the control processing unit 1, calculates the disposal rate, which is the ratio of the second total amount of separated inventory (the second total amount of separated inventory that was ultimately disposed of) to the first total amount of separated inventory, excluding the separated inventory used as product materials, when there are multiple separated inventory items classified in the same way during the predetermined period. The device then calculates the product CO2 emissions related to the target product (recalculated product CO2 emissions) again by subtracting the result of multiplying the calculated separated inventory CO2 emissions by (1 - the disposal rate) from the calculated total process CO2 emissions, and stores it in the storage unit 5 (S10).

[0084] In the example above, for example as shown in Figure 10, if the first total amount is "570" [tons] and the second total amount is "228" [tons], the waste disposal rate of "40%" [= (288 / 570) × 100] can be obtained by dividing the second total amount "228" [tons] by the first total amount "570" [tons]. In this example, Figure 11 shows that in each record for each product named "P001" to "P100", the calculated CO2 emissions for each product are shown in a front view. It is listed in the rightmost column. For example, in the record for product name "P001", the recalculated product CO2 emissions "151.1" [tCO2] (=182.3-31.2) is listed in the rightmost column when viewed from the front. This is obtained by subtracting the result of multiplying the separated inventory CO2 emissions "52" [tCO2] by (1-the aforementioned disposal rate [0.4]) from the total process CO2 emissions "182.3" [tCO2], which is "31.2" [tCO2] (=52×(1-0.4)).

[0085] In this process S10, the product emission recalculation unit 21 may, if there are multiple separated stock items classified in the same way during the predetermined period, calculate the utilization rate, which is the ratio of the third total amount of separated stock items used as product materials to the first total amount of the multiple separated stock items, and then calculate the recalculated product CO2 emissions by subtracting the result of multiplying the calculated separated stock item CO2 emissions by the utilization rate from the calculated total process CO2 emissions. In the example above, the utilization rate of "60%" (=(342 / 570)×100) is obtained by dividing the third total amount "342" [tons] (=570-228) by the first total amount "570" [tons]. For product name "P001", the recalculated product CO2 emissions of "151.1" [tCO2] (=182.3-31.2) is obtained by subtracting the result of multiplying the separated inventory CO2 emissions of "52" [tCO2] by the utilization rate [0.6] (=52×0.6) from the total process CO2 emissions of "182.3" [tCO2].

[0086] The carbon dioxide emission calculation device 1000 then outputs each calculation result, for example, the CO2 emissions of separated inventory raw materials, the CO2 emissions of separated inventory processes, the CO2 emissions of separated inventory, the total process CO2 emissions, the initial product CO2 emissions, the aggregated CO2 emissions of separated inventory, the aggregated product CO2 emissions, the CO2 emissions of first and second unit separated inventory, the CO2 emissions of utilized separated inventory, the first and second total amounts, the disposal rate, and the recalculated product CO2 emissions, to the output unit 3 (S11), and the process ends. The control unit 11 may also output each calculation result to an external device via the IF unit 4 if necessary.

[0087] If the separated inventory is used as a product material, and a specific process is included in the multiple processes in which the separated inventory is used as a product material, the carbon dioxide emission calculation device 1000 operates in the same manner as described above, obtaining and outputting the results of each calculation.

[0088] On the other hand, if the separated stock is used as a product material, and the specific process is not included in the multiple processes by which the product is manufactured using the separated stock as a product material, the carbon dioxide emission calculation device 1000 operates as follows when determining the product's CO2 emissions.

[0089] Figure 12 is a diagram illustrating product information when separated inventory is used as a product material, as an example. Figure 13 is a diagram illustrating the method for calculating product CO2 emissions when separated inventory is used as a product material, as an example.

[0090] In this case, the carbon dioxide emission calculation device 1000, using the second product emission calculation unit 22 of the control processing unit 1, calculates the process CO2 emissions for each of the multiple processes for manufacturing a product using separated inventory as product material, and calculates the sum of the raw material CO2 emissions and the process CO2 emissions calculated for each of the multiple processes for manufacturing the product as the product process CO2 emissions.

[0091] For example, as shown in Figure 12, when a product named "P101" is manufactured using "4" [tons] of scrap material (an example of separated inventory), and going through the second process named "heat treatment," the third process named "surface treatment," and the fourth process named "shipping," the second product emission calculation unit 22 calculates the CO2 emissions for each of the second to fourth processes as shown in Figure 13: "4" [tCO2] (=1 [tCO2 / ton] × 4 [tons]) and "2" [tCO2] (=0.5 [tCO2 / ton]). The CO2 emissions for the product process are calculated as follows: (×4 [ton]), "0.18" [tCO2] (=0.05 [tCO2 / ton] × 3.6 [ton]), and the raw material CO2 emissions "24.8" [tCO2] (=6.2 [tCO2 / ton] × 4 [ton]) are added together with the CO2 emissions for each of the multiple processes for manufacturing the product, resulting in a sum of "30.98" [tCO2] (=24.8 + 4 + 2 + 0.18), which is stored in the memory unit 5. Separated stock materials used as product materials include, for example, "4" [ton] of the "8" [tons] of separated stock materials generated in the manufacture of product "P001", and "4" [tons] of separated stock materials generated in the manufacture of product "P100".

[0092] In the example described above, there is one specific process included in the multiple processes for manufacturing the product, but there may be multiple processes. In this case, the first emission calculation unit 12 calculates the CO2 emissions of the separated inventory raw materials at each of the multiple specific processes in the same manner as described above, the second emission calculation unit 13 calculates the CO2 emissions of the separated inventory processes at each of the multiple specific processes in the same manner as described above, the separated inventory emission calculation unit 14 calculates the CO2 emissions of the separated inventory at each of the multiple specific processes in the same manner as described above, and the first product emission calculation unit 16 calculates the product CO2 emissions related to the target product by subtracting the CO2 emissions of the separated inventory calculated for each of the multiple specific processes from the total process CO2 emissions calculated above.

[0093] Figure 14 illustrates, as an example, how to calculate the CO2 emissions of separated inventory in a case where there are multiple specific processes. For example, product name "P333" is manufactured through the following processes, as shown in Figure 14: process 1 "raw materials", process 2 "melting and casting", process 3 "extrusion 2", process 4 "cutting A", process 5 "heat treatment", process 6 "cutting B", process 7 "heat treatment", process 8 "surface treatment", and process 9 "shipping". Process 4 "cutting A" and process 6 "cutting B" are specific processes, and the separated materials from processes 4 and 6 are separated inventory.

[0094] In such cases, the separated inventory emission calculation unit 14 calculates the separated inventory CO2 emission amount "25.2" [tCO2] (=16+6+2.4+0.8) for the fourth step of the specific process, which is the sum of the separated inventory raw material CO2 emission amount "16" [tCO2] and the separated inventory process CO2 emission amounts "6" [tCO2], "2.4" [tCO2], and "0.8" [tCO2] calculated for each of the processes from the second step to the fourth step of the specific process, and the separated inventory CO2 emission amount "25.2" [tCO2] (=16+6+2.4+0.8). For the sixth step of the process, the CO2 emissions from the separated stock raw materials, "24" [tCO2], and the CO2 emissions from each separated stock process calculated for each step from the second step to the sixth step of the specific process, "9" [tCO2], "3.6" [tCO2], "1.2" [tCO2], "6" [tCO2], and "0.9" [tCO2], are added together to calculate the total CO2 emissions from the separated stock materials, "44.7" [tCO2] (=24+9+3.6+1.2+6+0.9).

[0095] The first product emission calculation unit 16 calculates the product CO2 emission "73" [tCO2] (=142.9-25.2-44.7) for the target product by subtracting the separated inventory CO2 emissions "25.2" [tCO2] and "44.7" [tCO2], respectively, which are calculated for the fourth and sixth processes of the specific process, from the total process CO2 emissions "142.9" [tCO2] for the product named "P333".

[0096] The first unit quantity calculation unit 18 determines the CO2 emissions of the first unit of separated stock in the fourth process as "6.3" [tCO2 / ton] (=25.2 / 4), and determines the CO2 emissions of the first unit of separated stock in the sixth process as "7.45" [tCO2 / ton] (=44.7 / 6).

[0097] As described above, the carbon dioxide emission calculation system (or carbon dioxide emission calculation device as an example) 1000 in the embodiment, and the carbon dioxide emission calculation method and carbon dioxide emission calculation program implemented therein, calculate the CO2 emission of the separated stock raw material and the CO2 emission of each separated stock process calculated for each process from the first process to a specific process as the CO2 emission of the separated stock. Therefore, even when separated stock is generated, the CO2 emission can be calculated. Since the CO2 emission of the separated stock is calculated, when the separated stock is used as a product material, the CO2 emission of the separated stock can be used as the CO2 emission of the raw material, and even when the separated stock is used as a product material, the CO2 emission of the raw material can be determined in the same way as the original raw material.

[0098] The above carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can determine the product CO2 emissions related to the target product by subtracting the CO2 emissions of separated inventory from the total process CO2 emissions. Since product CO2 emissions are the CO2 emissions related to the manufacture of the product, they are usually calculated as the sum of the raw material CO2 emissions and the process CO2 emissions related to each process, as explained using, for example, Figures 12 and 13. As mentioned above, when separated inventory is used as a product material, the CO2 emissions of this separated inventory are included in the product CO2 emissions of the product manufactured using the separated inventory as a raw material. Therefore, if product CO2 emissions are calculated in the usual manner as described above, the CO2 emissions of separated inventory will be counted twice. The above carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program determine product CO2 emissions by subtracting the CO2 emissions of separated inventory from the total process CO2 emissions. This avoids double counting, and allows for the appropriate determination of product CO2 emissions for products manufactured through multiple processes, including specific processes, as well as product CO2 emissions for products manufactured using separated inventory as raw materials.

[0099] The above carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can determine the first unit of separated stock CO2 emission, which is the CO2 emission per unit amount of separated stock. When separated stock is managed individually, the first unit of separated stock CO2 emission can be used as the unit raw material CO2 emission, which is the CO2 emission per unit amount of raw material, and the unit raw material CO2 emission when the separated stock is used as is as a product material can be determined.

[0100] The above carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can determine the second unit of separated stock CO2 emissions, which is the CO2 emissions per unit quantity for multiple separated stock items classified in the same category. When separated stock items cannot be managed individually and multiple separated stock items classified in the same category are managed together, the second unit of separated stock CO2 emissions can be used as the unit raw material CO2 emissions, and the unit raw material CO2 emissions when a portion of the multiple separated stock items managed together are used as product materials can be determined.

[0101] The above carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can determine the CO2 emissions (CO2 emissions from utilized separated stock) related to separated stock materials of the same classification that were used as product materials during a predetermined period. In other words, the total amount of CO2 emissions from separated stock materials of the same classification that were used as product materials during a predetermined period is determined as the CO2 emissions from utilized separated stock.

[0102] The above-mentioned carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can allocate the CO2 emissions of separated stock, excluding separated stock used as product materials, to the product CO2 emissions related to the target product by recalculating the product CO2 emissions related to the target product. The product CO2 emissions calculated as described above do not include the total amount of CO2 emissions from separated stock, assuming that the entire amount of separated stock is used as product materials. Products are usually manufactured according to actual orders or planned (forecasted) orders, so it is possible that the entire amount of separated stock may not be used as product materials within the predetermined period. The above-mentioned carbon dioxide emission calculation system (carbon dioxide emission calculation device) 1000, carbon dioxide emission calculation method, and carbon dioxide emission calculation program can allocate the CO2 emissions of separated stock, excluding separated stock used as product materials (CO2 emissions from separated stock that has been discarded), to the product CO2 emissions related to the target product, and thus the CO2 emissions from the discarded separated stock can be allocated to the product CO2 emissions. Therefore, the total amount of CO2 emissions related to the factory over a specified period can be considered and allocated to product CO2 emissions.

[0103] In the above embodiment, CO2 emissions were determined based on the actual production results of products manufactured during a predetermined period. However, CO2 emissions may also be determined based on a product manufacturing plan that outlines the production of products during a predetermined period. This allows for the prediction of CO2 emissions. In this case, the product information includes, for example, raw material information relating to the raw materials used to manufacture the product, manufacturing process information relating to multiple processes for manufacturing the product, and product manufacturing plan information relating to products planned for production during a predetermined period. The disposal rate (or utilization rate) is predicted, for example, from past performance, and this predicted value is used for the disposal rate (or utilization rate).

[0104] To illustrate the present invention, the embodiments have been adequately and fully described above with reference to the drawings. However, those skilled in the art should recognize that it is easy to modify and / or improve upon the embodiments described above. Therefore, unless such modifications or improvements implemented by those skilled in the art fall outside the scope of the claims, such modifications or improvements shall be considered to be included within the scope of the claims. [Explanation of symbols]

[0105] 1000 Carbon Dioxide Emission Calculation System (An example of a carbon dioxide emission calculation device) 1 Control Processing Unit 2 Input section 3. Output section 4. Interface section (IF section) 5 Storage section 11 Control Unit 12 1st emission calculation section 13 Second emission calculation section 14 Separated inventory discharge amount calculation section 15 Total process emissions calculation unit 16 1st product emission calculation section 17. Aggregation and Calculation Unit 18. First Unit Quantity Calculation Unit 19. Second Unit Quantity Calculation Unit 20 Utilization separation inventory discharge calculation section 21 Product emissions recalculation section 22 2nd product emissions calculation section 51 Product information storage section 52 Unit Emission Information Storage Unit

Claims

1. CO2 emissions from the target product manufactured within a specified period at a factory capable of producing multiple types of products that are manufactured through multiple processes from raw materials. ２ A carbon dioxide emission calculation system for determining emissions, The aforementioned multiple processes include, as a specific process, a process in which separated inventory is generated, which is separated from the main body during processing and becomes inventory. The raw material CO ２ Of the emissions, CO2 related to the separated stocks raw materials ２ A first emissions calculation unit that determines emissions, Of the multiple processes for manufacturing the aforementioned target product, for each of the processes from the first process to the specific process, the process CO2 related to that process ２ The emissions were determined, and the process CO2 obtained above ２ Of the emissions, CO2 related to the separated inventory process in the said process ２ A second emissions calculation unit that determines emissions, The separated inventory raw material CO ２ emission amount, and for each process from the first process to the specific process, each separated inventory process CO ２ The sum of the emission amounts is the separated inventory CO ２ A separated inventory emission amount calculation unit that obtains the emission amount as the separated inventory emission amount, and A carbon dioxide emissions calculation system.

2. For each of the multiple processes for manufacturing the aforementioned target product, in that process, process CO2 related to that process ２ Determining the emissions, the aforementioned raw material CO2 ２ Emissions and CO2 emissions for each of the multiple processes used to manufacture the aforementioned product. ２ The sum of emissions and total process CO2 ２ The total process emissions calculation unit, which determines the emissions, The total process CO2 calculated above ２ Separated inventory CO2 obtained from emissions ２ By subtracting emissions, the CO2 emissions related to the aforementioned product are reduced. ２ It further includes a first product emissions calculation unit that determines the emissions, The carbon dioxide emission calculation system according to claim 1.

3. CO per unit quantity relating to the aforementioned separated stock ２ CO2 emissions from the first unit of separated inventory ２ It further includes a first unit quantity calculation unit for determining emissions. The carbon dioxide emission calculation system according to claim 1.

4. If there are multiple separated stock items classified in the same category during the predetermined period, the CO2 per unit quantity for the multiple separated stock items ２ CO2 emissions from the second unit of separated inventory ２ It further includes a second unit quantity calculation unit for determining emissions. The carbon dioxide emission calculation system according to claim 1.

5. If there are multiple separated stock items classified in the same way during the predetermined period, the CO of the separated stock items used as product materials will be determined. ２ Utilizing emissions Separated inventory CO ２ It further includes a unit for calculating the amount of waste generated from separated inventory, which is used as the amount of waste generated. The carbon dioxide emission calculation system according to claim 1.

6. For each of the multiple processes for manufacturing the aforementioned target product, in that process, process CO2 related to that process ２ Determining the emissions, the aforementioned raw material CO2 ２ Emissions and CO2 emissions for each of the multiple processes used to manufacture the aforementioned product. ２ The sum of emissions and total process CO2 ２ The total process emissions calculation unit, which determines the emissions, In the predetermined period, if there are multiple separated inventory items classified in the same way, the disposal rate is calculated as the ratio of the second total amount of separated inventory items (excluding those used as product materials) to the first total amount of separated inventory items, or the utilization rate is calculated as the ratio of the third total amount of separated inventory items (excluding those used as product materials) to the first total amount of separated inventory items, and the total process CO2 calculated is calculated as follows: ２ From the emissions, the separated inventory CO2 obtained above ２ The result of multiplying the emissions by (1 - the aforementioned disposal rate), or the CO2 from the separated inventory obtained above. ２ By subtracting the result of multiplying the emissions by the utilization rate, the product CO2 related to the target product is obtained. ２ It further includes a product emissions recalculation unit that recalculates emissions, The carbon dioxide emission calculation system according to claim 1.

7. When the aforementioned separated stock is used as a product material to manufacture a product, the separated stock CO ２ Emissions from the aforementioned raw material CO2 ２ Product CO2 emissions related to the aforementioned product ２ A carbon dioxide emission calculation system according to claim 2 for determining emissions, If the process for manufacturing the product does not include the specific process, then for each of the processes for manufacturing the product, the process CO related to that process ２ Determining the emissions, the aforementioned raw material CO2 ２ Emissions and CO2 emissions for each of the multiple processes used to manufacture the aforementioned product. ２ The sum of emissions and CO2 from the product process ２ It further includes a second product emissions calculation unit that calculates emissions. A carbon dioxide emissions calculation system.

8. CO2 emissions from the target product manufactured within a specified period at a factory capable of producing multiple types of products that are manufactured through multiple processes from raw materials. ２ A method for calculating carbon dioxide emissions, The aforementioned multiple processes include, as a specific process, a process in which separated inventory is generated, which is separated from the main body during processing and becomes inventory. The raw material CO ２ Of the emissions, CO2 related to the separated stocks raw materials ２ The first emission calculation step involves determining the amount of emissions, Of the multiple processes for manufacturing the aforementioned target product, for each of the processes from the first process to the specific process, the process CO2 related to that process ２ The emissions were determined, and the process CO2 obtained above ２ Of the emissions, CO2 related to the separated inventory process in the said process ２ The second emission calculation step involves determining the amount of emissions, The separated inventory raw material CO ２ The amount of emissions and the CO2 emissions for each separated inventory process determined for each process from the first process to the specific process. ２ Sum of emissions and separated inventory CO2 ２ The system includes a step for calculating the amount of separated inventory emissions to be determined as emissions, Method for calculating carbon dioxide emissions.

9. CO2 emissions from the target product manufactured within a specified period at a factory capable of producing multiple types of products that are manufactured through multiple processes from raw materials. ２ A carbon dioxide emission calculation program for determining emissions, which causes a computer to function as a carbon dioxide emission calculation system according to any one of claims 1 to 7.

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