Carbon-dioxide emissions volume computing device, computer program, and carbon-dioxide emissions volume computing method

Abstract

This carbon-dioxide emissions volume computing device is provided with a control unit. The control unit: acquires exhaust-gas information of exhaust gas supplied to carbon-dioxide recovery units that recover carbon dioxide contained in exhaust gas; specifies, on the basis of the acquired exhaust-gas information, a first needed time that the carbon-dioxide recovery units require to convert the supplied exhaust gas into concentrated carbon dioxide gas; and computes, on the basis of power information relating to power supplied to the carbon-dioxide recovery units during the first needed time, the volume of carbon-dioxide emissions that is required for the carbon dioxide concentration.

Description

Carbon dioxide emission calculation device, computer program, and carbon dioxide emission calculation method

[0001] The present invention relates to a carbon dioxide emission calculation device, a computer program, and a carbon dioxide emission calculation method.

[0002] Of all greenhouse gases, carbon dioxide has the greatest impact on global warming. Various efforts are being made to reduce greenhouse gas emissions, such as reducing the carbon dioxide emitted when incinerating waste at waste incineration facilities.

[0003] Patent Document 1 discloses a methanol production system for recovering carbon dioxide from exhaust gas collected from a waste incineration facility and producing methanol using the recovered carbon dioxide.

[0004] Japanese Patent Application Laid-Open No. 2023-56116

[0005] The system in Patent Document 1 can determine the extent to which carbon dioxide generated during the incineration of waste at a waste incineration facility has been reduced, but does not consider how much energy is required to capture the carbon dioxide, making it impossible to properly evaluate the impact of carbon dioxide on the environment.

[0006] One aspect of the present invention provides a carbon dioxide emission calculation device, a computer program, and a carbon dioxide emission calculation method that can determine the amount of carbon dioxide emitted when carbon dioxide is recovered from exhaust gas.

[0007] A carbon dioxide emission calculation device according to one aspect of the present invention includes a control unit that acquires exhaust gas information of exhaust gas supplied to a carbon dioxide recovery unit that recovers carbon dioxide contained in the exhaust gas, determines a first required time required for the carbon dioxide recovery unit to convert the supplied exhaust gas into carbon dioxide-enriched gas based on the acquired exhaust gas information, and calculates the amount of carbon dioxide emission required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide recovery unit during the first required time.

[0008] According to the carbon dioxide emission calculation device of the above aspect, it is possible to grasp the amount of carbon dioxide emitted when carbon dioxide is recovered from exhaust gas.

[0009] FIG. 1 is a diagram showing an example of the configuration of an operation control system for carbon compound production equipment. FIG. 2 is a diagram showing an example of the configuration of a carbon dioxide emission calculation device. FIG. 3 is a diagram showing an example of power information. FIG. 4 is a diagram showing an example of a timeline of carbon dioxide concentration and carbon compound synthesis in the case of batch processing. FIG. 5 is a diagram showing an example of a method for calculating carbon dioxide emission in the case of batch processing. FIG. 6 is a diagram showing an example of a timeline of carbon dioxide concentration and carbon compound synthesis in the case of continuous processing. FIG. 7 is a diagram showing an example of a method for calculating carbon dioxide emission in the case of continuous processing. FIG. 8 is a diagram showing a first example of an electrolytic cell provided in a recovery unit. FIG. 9 is a diagram showing a second example of an electrolytic cell provided in a recovery unit. FIG. 10 is a diagram showing a first example of an electrolytic cell provided in a synthesis unit. FIG. 11 is a diagram showing a second example of an electrolytic cell provided in a synthesis unit. FIG. 12 is a diagram showing an example of a processing procedure performed by the carbon dioxide emission calculation device.

[0010] (1) A carbon dioxide emission calculation device according to one embodiment of the present invention includes a control unit, which acquires exhaust gas information of exhaust gas supplied to a carbon dioxide recovery unit that recovers carbon dioxide contained in the exhaust gas, determines a first required time required for the carbon dioxide recovery unit to convert the supplied exhaust gas into a carbon dioxide-enriched gas based on the acquired exhaust gas information, and calculates the amount of carbon dioxide emission required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide recovery unit during the first required time.

[0011] (8) A computer program according to one embodiment of the present invention causes a computer to execute the following process: acquire exhaust gas information of exhaust gas supplied to a carbon dioxide recovery unit that recovers carbon dioxide contained in the exhaust gas; determine a first required time required for the carbon dioxide recovery unit to convert the supplied exhaust gas into a carbon dioxide-enriched gas based on the acquired exhaust gas information; and calculate the amount of carbon dioxide emissions required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide recovery unit during the first required time.

[0012] (9) A carbon dioxide emission calculation method according to one embodiment of the present invention acquires exhaust gas information of exhaust gas supplied to a carbon dioxide recovery unit that recovers carbon dioxide contained in the exhaust gas, determines a first required time required for the carbon dioxide recovery unit to convert the supplied exhaust gas into a carbon dioxide-enriched gas based on the acquired exhaust gas information, and calculates the amount of carbon dioxide emissions required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide recovery unit during the first required time.

[0013] According to a carbon dioxide emission calculation device, computer program, and carbon dioxide emission calculation method according to one embodiment of the present invention, the carbon dioxide emission amount required for carbon dioxide concentration is calculated based on power information regarding the power supplied to the carbon dioxide capture unit during a first required time required for the carbon dioxide capture unit to convert the supplied flue gas into a carbon dioxide-enriched gas. The first required time can be specified based on flue gas information of the flue gas. When the flue gas is supplied to the carbon dioxide capture unit as a single batch, the first required time can be the time required for processing the batch (carbon dioxide capture process). When the flue gas is continuously supplied to the carbon dioxide capture unit, the first required time can be a predetermined time (one hour, two hours, one day, one week, etc.). This makes it possible to determine the carbon dioxide emission amount required for carbon dioxide concentration, i.e., the carbon dioxide emission amount when carbon dioxide is captured from the flue gas.

[0014] (2) In the carbon dioxide emission calculation device described in (1) above, the control unit may acquire concentrated gas information of the carbon dioxide-enriched gas converted from the exhaust gas by the carbon dioxide recovery unit, and calculate the carbon dioxide emission amount required for carbon dioxide concentration based on the acquired concentrated gas information and the exhaust gas information of the exhaust gas supplied.

[0015] The carbon dioxide emission calculation device of (2) above calculates the amount of carbon dioxide emission required for carbon dioxide concentration based on exhaust gas information of the exhaust gas supplied to the carbon dioxide capture unit and concentrated gas information of the carbon dioxide-enriched gas converted from the exhaust gas by the carbon dioxide capture unit. The exhaust gas information includes the composition of the exhaust gas (carbon dioxide, oxygen, nitrogen, etc.), the concentration of each component (e.g., average concentration), the molar ratio of each component, and the flow rate (e.g., average flow rate). The concentrated gas information includes the carbon dioxide concentration (e.g., average concentration), flow rate (e.g., average flow rate), etc. This makes it possible to determine the amount of carbon dioxide emission required for carbon dioxide concentration, i.e., the amount of carbon dioxide contained in the exhaust gas and the carbon dioxide-enriched gas, and therefore the amount of carbon dioxide emission when carbon dioxide is captured from the exhaust gas, with high accuracy.

[0016] (3) In the carbon dioxide emission calculation device described in (1) or (2) above, the exhaust gas information and the concentrated gas information each include a gas concentration and a gas flow rate, and the control unit may calculate a first amount of carbon dioxide contained in the exhaust gas supplied based on the exhaust gas information, calculate a second amount of carbon dioxide contained in the carbon dioxide concentrated gas based on the concentrated gas information, and calculate the carbon dioxide emission amount required for carbon dioxide concentration based on the calculated first amount of carbon dioxide and second amount of carbon dioxide.

[0017] According to the carbon dioxide emission calculation device of (3) above, a first amount of carbon dioxide contained in the exhaust gas is calculated, a second amount of carbon dioxide contained in the carbon dioxide-enriched gas is calculated, and the amount of carbon dioxide emission required for carbon dioxide concentration is calculated based on the calculated first and second amounts of carbon dioxide. If the first amount of carbon dioxide is greater than the second amount of carbon dioxide, the difference (first amount of carbon dioxide - second amount of carbon dioxide) may be added as the amount of carbon dioxide emission required for carbon dioxide concentration. This makes it possible to accurately determine the amount of carbon dioxide emission when recovering carbon dioxide from the exhaust gas.

[0018] (4) In the carbon dioxide emission calculation device described in any one of (1) to (3) above, the power information may include the ratio of carbon dioxide emissions to the amount of power supplied by each type of power supply source, and the amount of power supplied by each power supply source to the carbon dioxide recovery unit or the carbon compound synthesis unit at a specified time.

[0019] According to the carbon dioxide emission calculation device of (4) above, it is possible to calculate the amount of carbon dioxide emissions based on the amount of electricity supplied to the carbon dioxide capture unit to operate the carbon dioxide capture unit and the type of electricity supply source. If the ratio of the amount of carbon dioxide emissions to the amount of electricity supplied by electricity supply source P1 is R1, and an amount of electricity supplied from electricity supply source P1 is W1, the amount of carbon dioxide emissions can be calculated as W1 x R1. This makes it possible to accurately determine the amount of carbon dioxide emissions when capturing carbon dioxide from exhaust gas, even when multiple types of electricity are used to capture carbon dioxide.

[0020] (5) In the carbon dioxide emission calculation device described in any one of (1) to (4) above, the control unit may acquire concentrated gas information of the carbon dioxide concentrated gas supplied to a carbon compound synthesis unit that synthesizes carbon compounds, and based on the acquired concentrated gas information, determine a second required time required for the carbon compound synthesis unit to convert the supplied carbon dioxide concentrated gas into carbon compounds, and calculate the carbon dioxide emission amount required for carbon compound synthesis based on power information regarding the power supplied to the carbon compound synthesis unit during the second required time.

[0021] According to the carbon dioxide emission calculation device of (5) above, the carbon dioxide emission required for carbon compound synthesis is calculated based on power information regarding the power supplied to the carbon compound synthesis unit during a second required time required for the carbon compound synthesis unit to convert the supplied carbon dioxide-enriched gas into carbon compounds. When exhaust gas is supplied to the carbon dioxide capture unit as a single batch of processing, and the carbon dioxide-enriched gas output from the carbon dioxide capture unit is supplied to the carbon compound synthesis unit, the second required time can be the time required for processing the batch (synthesis of carbon compounds). When exhaust gas is continuously supplied to the carbon dioxide capture unit, and the carbon dioxide-enriched gas output from the carbon dioxide capture unit is supplied to the carbon compound synthesis unit, the second required time can be a predetermined time (one hour, two hours, one day, one week, etc.). This makes it possible to determine the carbon dioxide emission required for carbon compound synthesis.

[0022] (6) In the carbon dioxide emission calculation device described in (5) above, the power information regarding the power supplied to the carbon compound synthesis unit during the second required time may include the ratio of carbon dioxide emissions to the amount of power supplied for each type of power supply source.

[0023] According to the carbon dioxide emission calculation device of (6) above, the carbon dioxide emission amount can be calculated based on the amount of power supplied to the carbon compound synthesis unit to operate the carbon compound synthesis unit and the type of power supply source. If the ratio of the carbon dioxide emission amount to the amount of power supplied by power supply source P1 is R1 and an amount of power supplied from power supply source P1 of W1 is supplied to the carbon compound synthesis unit, the carbon dioxide emission amount can be calculated as W1 x R1. This makes it possible to determine the amount of carbon dioxide emission required for carbon compound synthesis even when multiple types of power are used for carbon compound synthesis.

[0024] (7) The carbon dioxide emission calculation device described in (5) or (6) above includes a first memory unit that stores, in association with each other, exhaust gas information of the exhaust gas supplied to the carbon dioxide recovery unit and concentrated gas information of the carbon dioxide-enriched gas supplied to a carbon compound synthesis unit that synthesizes the carbon compounds, and a second memory unit that stores power information including the ratio of carbon dioxide emissions to the amount of power supplied for each type of power supply source. The control unit may obtain a selection of at least one of the type of power supply source within a first required time required for the carbon dioxide recovery unit to convert the supplied exhaust gas into carbon dioxide-enriched gas, and the type of power supply source within a second required time required for the carbon compound synthesis unit to convert the supplied carbon dioxide-enriched gas into carbon compounds, and calculate the carbon dioxide emissions required for at least one of carbon dioxide concentration and carbon compound synthesis based on the type of power supply source selected.

[0025] According to the carbon dioxide emission calculation device of (7) above, the association between the exhaust gas information and the concentrated gas information may be performed for each batch of batch processing by the carbon dioxide recovery unit and the carbon compound synthesis unit, or for each predetermined processing time (1 hour, 2 hours, 1 day, 1 week, etc.). The time required for the batch processing and the predetermined processing time correspond to the first required time and the second required time. The type of power supply source that supplies power to each unit within the first required time and the second required time can be selected by an operator. This makes it possible to calculate the carbon dioxide emission amount required for at least one of carbon dioxide concentration and carbon compound synthesis based on the type of power supply source selected.

[0026] Hereinafter, embodiments of a carbon dioxide emission calculation device, a computer program, and a carbon dioxide emission calculation method will be described with reference to the drawings.

[0027] 1 is a diagram showing an example of the configuration of an operation control system for a carbon compound production facility. The operation control system includes an operation control device 20 and a carbon dioxide emission calculation device 50. The operation control device 20 and the carbon dioxide emission calculation device 50 are connected via a communication network 1. A data server 30 and an operator terminal 40 are connected to the communication network 1.

[0028] The carbon compound production facility includes a recovery unit (carbon dioxide recovery unit) 10, synthesis units (carbon compound synthesis units) 11 and 12, auxiliary material supply units 13, 14 and 15, storage tanks 16, 17 and 18, and sensors S1 to S12.

[0029] The production facility 100 is a facility such as a factory, and emits exhaust gas containing carbon dioxide in the production of products (including batteries, power supplies, lighting devices, etc.). The exhaust gas containing carbon dioxide emitted from the production facility 100 has exhaust gas information such as composition, concentration, temperature, and flow rate measured by a sensor S1, and then sent to a recovery unit 10. The exhaust gas transported by a transport vehicle 200 such as a tank truck has exhaust gas information such as composition, concentration, temperature, and flow rate measured by a sensor S2, and then sent to the recovery unit 10.

[0030] The capture unit 10 is a unit that captures carbon dioxide from exhaust gas, concentrating and capturing the carbon dioxide under conditions suitable for the exhaust gas fed therein. Carbon dioxide capture may be achieved by chemical adsorption, physical adsorption, membrane separation, electrochemical, or other methods. Chemical absorption involves absorbing carbon dioxide into an alkaline solution, such as an amine or potassium carbonate solution, and capturing it. Physical adsorption involves using an adsorbent, such as zeolite or activated carbon, to adsorb and capture only carbon dioxide from the combustion exhaust gas that comes into contact with the adsorbent. After adsorption, the adsorption performance is restored by desorption. Examples of recovery methods include pressure swing adsorption (PSA) and thermal swing adsorption (TSA). Membrane separation involves passing combustion exhaust gas through a porous membrane and separating and capturing carbon dioxide by utilizing differences in gas permeation rates. Electrochemical methods use an electrolytic cell, described below, to capture carbon dioxide electrochemically, and are preferred because they are relatively easy to miniaturize. When recovering carbon dioxide, the auxiliary material supply unit 13 supplies auxiliary materials necessary for recovering carbon dioxide as needed to the recovery unit 10. When supplying the auxiliary materials, the sensor S3 measures the composition, temperature, and supply amount of the auxiliary materials, and supplies an appropriate amount of the auxiliary materials to the recovery unit 10.

[0031] The gas in which carbon dioxide is concentrated (carbon dioxide concentrated gas) recovered in recovery unit 10 may be stored in storage tank 16 after having its composition, concentration of each component, ratio of each component, temperature, etc. measured by sensor S6, or the gas in which carbon dioxide is concentrated recovered in recovery unit 10 may be sent to synthesis unit 11 after having concentrated gas information such as the gas composition, concentration of each component, ratio of each component, and temperature measured by sensor S7. The gas (gas in which carbon dioxide is concentrated) stored in storage tank 16 may be sent to synthesis unit 11 after having concentrated gas information such as the gas composition, concentration of each component, ratio of each component, and temperature measured by sensor S8, or may be transported to a demand area by tank truck or the like.

[0032] The synthesis unit 11 is a synthesis unit that synthesizes carbon compounds, and synthesizes carbon compound A using carbon dioxide-enriched gas sent from the recovery unit 10 or the storage tank 16. In this specification, carbon compounds are carbon compounds synthesized using carbon dioxide as one of the raw materials. Carbon compound A includes methanol and carbon monoxide. The auxiliary material supply unit 14 supplies auxiliary materials necessary for the synthesis of the carbon compounds to the synthesis unit 11 as needed during the synthesis of the carbon compounds. When supplying the auxiliary materials, the composition, temperature, and supply amount of the auxiliary materials are measured by sensor S4, and an appropriate amount of the auxiliary materials is supplied to the synthesis unit 11.

[0033] The carbon compounds synthesized in the synthesis unit 11 may be stored in the storage tank 17 after carbon compound information such as the composition, the concentration of each composition, the ratio of each composition, and the temperature is measured by the sensor S9, or the carbon compounds synthesized in the synthesis unit 11 may be sent to the synthesis unit 12 after carbon compound information such as the composition, the concentration of each composition, the ratio of each composition, and the temperature is measured by the sensor S10. The carbon compounds stored in the storage tank 17 may be sent to the synthesis unit 12 after carbon compound information such as the composition, the concentration of each composition, the ratio of each composition, and the temperature is measured by the sensor S11, or may be transported to a demand area by a tank truck or the like.

[0034] The synthesis unit 12 is a carbon compound synthesis unit that synthesizes a carbon compound B using a carbon compound A sent from the synthesis unit 11 or the storage tank 17. The carbon compound B includes methane. The auxiliary material supply unit 15 supplies auxiliary materials necessary for the synthesis of the carbon compounds to the synthesis unit 12 as needed during the synthesis of the carbon compounds. When supplying the auxiliary materials, the composition, temperature, and supply amount of the auxiliary materials are measured by a sensor S5, and an appropriate amount of auxiliary materials is supplied to the synthesis unit 12. The carbon compounds synthesized in the synthesis unit 12 are stored in a storage tank 18 after the composition, concentration of each component, ratio of each component, temperature, etc. are measured by a sensor S12. The carbon compounds stored in the storage tank 18 are transported to the demand area by a tank truck or the like.

[0035] The recovery unit 10 and the combining units 11 and 12 can receive power from multiple power supply sources (in the example shown in the figure, three types of power supply sources 70, 80, and 90 are shown). Specifically, an appropriate power supply source can be switched from the multiple power supply sources depending on the time of day, day of the week, etc., and power can be supplied from the switched power supply source to each of the recovery unit 10 and the combining units 11 and 12. The power supplied to the recovery unit 10 and the combining units 11 and 12 can be measured by power meters 71, 81, and 91 provided for each type of power supply source.

[0036] Types of power supply sources include commercial power sources, solar power generation facilities, gas turbine power generation facilities, gas power generation facilities, etc. Solar power generation facilities, gas turbine power generation facilities, and gas power generation facilities are so-called private power generation facilities, and can be installed on the site where the carbon compound manufacturing facility is installed.

[0037] The operation control device 20 includes a control unit 21 and a communication unit 22 .

[0038] The communication unit 22 includes a communication module and transmits required information to the data server 30 via the communication network 1. The required information includes information related to the operation of the carbon compound production facility. The required information includes exhaust gas information measured by sensors S1 to S2, S6 to S8, S9 to S12, etc., concentrated gas information, carbon compound synthesis information, power information, etc. The data server 30 stores the required information in association with each other. The data server 30 can store exhaust gas information of the exhaust gas supplied to the recovery unit 10 and concentrated gas information of the carbon dioxide concentrated gas supplied to the synthesis unit 11 in association with each other. The communication unit 22 may transmit the required information to the carbon dioxide emission calculation device 50.

[0039] The control unit 21 includes a controller, a memory, etc., and controls the operation of the carbon compound production equipment. The control unit 21 controls the operation of the recovery unit 10 and the synthesis units 11 and 12, and also controls the operation of the auxiliary material supply units 13, 14, and 15 as necessary.

[0040] The data server 30 functions as a first storage unit, and stores exhaust gas information of the exhaust gas supplied to the recovery unit 10, concentrated gas information of the carbon dioxide-enriched gas supplied to the synthesis unit 11, and power information in association with each other. The data server 30 may store concentrated gas information of the carbon dioxide-enriched gas supplied to the synthesis unit 11, carbon compound information of the carbon compounds synthesized by the synthesis unit 11, and power information in association with each other. The data server 30 functions as a second storage unit, and stores power information including the ratio of carbon dioxide emissions to the amount of power supplied by each type of power supply source 70, 80, 90. Details of the power information will be described later. The data server 30 may be configured as a device separate from the carbon dioxide emission calculation device 50, as shown in FIG. 1, or may be configured to be incorporated into the carbon dioxide emission calculation device 50.

[0041] Carbon compounds include methane (CH 4 ), methanol (CH 3 OH), ethane (C 2 H 6 ), ethylene (C 2 H 4 ), ethanol (C 2 H 5 OH), carbon monoxide (CO), etc.

[0042] When calculating the carbon dioxide emission amount, the operator terminal 40 accepts the selection or input of the calculation conditions and outputs the accepted selection or input to the carbon dioxide emission calculation device 50. As the calculation conditions, it is possible to select whether the supply (input) of the exhaust gas to the recovery unit 10 is performed in batch units or continuously. As the calculation conditions, it is possible to select the power supply source that supplies power to the recovery unit 10 and the synthesis units 11 and 12, along with the time period.

[0043] 2 is a diagram showing an example of the configuration of the carbon dioxide emission calculation device 50. The carbon dioxide emission calculation device 50 includes a control unit 51 that controls the entire device, a communication unit 52, a memory 53, a storage unit 54, a carbon dioxide recovery amount calculation unit 56, a carbon compound synthesis amount calculation unit 57, and a carbon dioxide emission calculation unit 58.

[0044] The control unit 51 may be configured by incorporating a required number of central processing units (CPUs), micro-processing units (MPUs), graphics processing units (GPUs), etc. The control unit 51 may also be configured by combining digital signal processors (DSPs), field-programmable gate arrays (FPGAs), etc.

[0045] The communication unit 52 includes a communication module and has a function of communicating with the operation control device 20, the data server 30, and the operator terminal 40. The communication unit 52 can acquire required information from the data server 30, such as exhaust gas information on exhaust gas, concentrated gas information on carbon dioxide concentrated gas, and carbon compound information.

[0046] The storage unit 54 can be configured with a hard disk or semiconductor memory, etc., and stores a computer program 55 (program product) and required information.

[0047] The computer program 55 is a program that runs on the carbon dioxide emission calculation device 50, and may be downloaded from an external device via the communication unit 52 and stored in the memory unit 54, or the computer program 55 recorded on a recording medium (such as an optically readable disk storage medium such as a CD-ROM) may be read by a recording medium reading unit and stored in the memory unit 54.

[0048] The memory 53 can be configured with semiconductor memory such as SRAM (Static Random Access Memory), DRAM (Dynamic Random Access Memory), flash memory, etc. A computer program 55 can be loaded into the memory 53 and executed by the control unit 51. The control unit 51 can execute processing defined by the computer program 55. In other words, processing by the control unit 51 is also processing by the computer program 55.

[0049] The carbon dioxide recovery amount calculation unit 56 calculates the amount of carbon dioxide (first carbon dioxide amount) contained in the exhaust gas supplied (input) to the recovery unit 10. The carbon dioxide recovery amount calculation unit 56 calculates the amount of carbon dioxide (second carbon dioxide amount) contained in the carbon dioxide-enriched gas converted from the exhaust gas by the recovery unit 10.

[0050] The carbon compound synthesis amount calculation unit 57 calculates the synthesis amount of the carbon compounds synthesized by the synthesis unit 11. The carbon compound synthesis amount calculation unit 57 may calculate the synthesis amount of the carbon compounds synthesized by the synthesis unit 12.

[0051] The carbon dioxide emission amount calculation unit 58 calculates the amount of carbon dioxide emission required for carbon dioxide concentration and the amount of carbon dioxide emission required for carbon compound synthesis. The calculation of the amount of carbon dioxide emission will be described in detail later.

[0052] The carbon dioxide recovery amount calculation unit 56, the carbon compound synthesis amount calculation unit 57, and the carbon dioxide emission amount calculation unit 58 may be configured as hardware or software (processing by the computer program 55).

[0053] FIG. 3 is a diagram showing an example of power information. The power information is information that associates the ratio of carbon dioxide emissions to the amount of power supplied for each type of power supply source. In the example of FIG. 3, for convenience, the types of power supply sources are represented by symbols P1 to P3, and the ratios of carbon dioxide emissions to the amount of power supplied corresponding to each type P1 to P3 are represented by symbols R1 to R3. In other words, when power from power supply source P1 is used, the ratio of carbon dioxide emissions to the amount of power supplied is R1. If the amount of power supplied during operation of the recovery unit 10 and synthesis units 11 and 12 is W1, the amount of carbon dioxide emitted by that operation can be calculated by W1 x R1. The same applies to other power supply sources.

[0054] Next, a method for calculating the amount of carbon dioxide emission required for carbon dioxide concentration and the amount of carbon dioxide emission required for carbon compound synthesis will be described. Calculation of the amount of carbon dioxide emission can be broadly divided into two cases: (1) a case where exhaust gas is supplied from the tank truck 200 and not from the production facility 100, in which carbon dioxide concentration and carbon compound synthesis are performed by so-called batch-by-batch processing, and (2) a case where exhaust gas is continuously supplied from the production facility 100 (including a case where exhaust gas is simultaneously supplied from the tank truck 200), in which carbon dioxide concentration and carbon compound synthesis are performed continuously. First, the case of batch processing will be described. Below, the recovery unit 10 and the synthesis unit 11 are described, but the same applies to the synthesis unit 12.

[0055] 4 is a diagram showing an example of a timeline of carbon dioxide concentration and carbon compound synthesis in the case of batch processing. As shown in Fig. 4, the timeline represents, from top to bottom, the supply (input) of exhaust gas, the operation (operation) of the recovery unit 10, the output of carbon dioxide-enriched gas from the recovery unit 10, the supply of carbon dioxide-enriched gas, the operation (operation) of the synthesis unit 11, and the output of carbon compounds from the synthesis unit 11.

[0056] Assume that exhaust gas is supplied to the recovery unit 10 between time t1 and time t2. The recovery unit 10 performs a process of recovering carbon dioxide (concentrating carbon dioxide) from the supplied exhaust gas (batch) starting at time t1, and ends the process after a first required time. The first required time can be determined based on exhaust gas information, specifically, the time during which the exhaust gas is supplied. The amount of power received by the recovery unit 10 during the first required time and the power supply source are assumed to be W1 (P1), W2 (P2), and W3 (P1). The power supply source P1 is a commercial power source, and the power supply source P2 is a solar power generation facility.

[0057] The recovery unit 10 outputs the carbon dioxide-enriched gas between time t3 and time t4 (end of treatment) after ΔT1 has elapsed since time t1, and the output carbon dioxide-enriched gas is supplied to the synthesis unit 11. The time difference ΔT1 may be zero.

[0058] The synthesis unit 11 processes the supplied carbon dioxide-enriched gas (batch) to synthesize carbon compounds starting at time t3, and ends the process after a second required time. The second required time can be determined based on the concentrated gas information, specifically, the time during which the carbon dioxide-enriched gas is supplied to the synthesis unit 11. The amounts of power received by the synthesis unit 11 during the second required time and the power supply sources are designated as W4 (P1), W5 (P2), and W6 (P1).

[0059] The synthesis unit 11 synthesizes the carbon compound between time t5 and time t6 (the end time of the process) after ΔT2 has elapsed since time t3, and outputs the carbon compound. The time difference ΔT2 may be zero.

[0060] FIG. 5 is a diagram showing an example of a method for calculating carbon dioxide emissions in the case of batch processing. The calculation method illustrated in FIG. 5 is based on the timeline illustrated in FIG. 4. FIG. 5A shows the amount of carbon dioxide emissions required for carbon dioxide concentration by the recovery unit 10. The data server 30 stores, in association with each other, exhaust gas information and carbon dioxide-enriched gas information acquired from the operation control device 20. The exhaust gas information is information about the exhaust gas supplied to the recovery unit 10 between time t1 and time t2. The exhaust gas information includes the composition, concentration, temperature, flow rate, and time for which the exhaust gas is supplied. The carbon dioxide-enriched gas information is information about the carbon dioxide-enriched gas output from the recovery unit 10 between time t3 and time t4. When the carbon dioxide-enriched gas output from the recovery unit 10 is supplied directly to the synthesis unit 11, the information about the carbon dioxide-enriched gas output from the recovery unit 10 between time t3 and time t4 is also information about the carbon dioxide-enriched gas supplied to the synthesis unit 11 between time t3 and time t4.

[0061] The carbon dioxide emission amount E1 required for carbon dioxide concentration by the recovery unit 10 can be expressed by the formula E1 = W1 x R1 + W2 x R2 + W3 x R1, where R1 and R2 are the ratios of carbon dioxide emission to the supplied power corresponding to the power supply sources P1 (e.g., commercial power supply) and P2 (e.g., solar power generation equipment) (see FIG. 3). If it is considered that the power supply from the solar power generation equipment does not emit carbon dioxide (i.e., R2 = 0), the carbon dioxide emission amount E1 can be expressed as (W1 + W3) x R1.

[0062] 5B shows the amount of carbon dioxide emission required for carbon compound synthesis by the synthesis unit 11. The data server 30 stores carbon dioxide-enriched gas information (enriched gas information) and carbon compound information obtained from the operation control device 20 in association with each other. The carbon dioxide-enriched gas information is information on the carbon dioxide-enriched gas supplied to the synthesis unit 11 between time t3 and time t4. The carbon dioxide-enriched gas information includes the composition, concentration, temperature, flow rate, and time for which the carbon dioxide-enriched gas is supplied of the carbon dioxide-enriched gas. The carbon compound information is information on carbon compounds output from the synthesis unit 11 between time t5 and time t6.

[0063] The carbon dioxide emission amount E2 required for carbon compound synthesis by synthesis unit 11 can be expressed by the formula E2 = W4 × R1 + W5 × R2 + W6 × R1. R1 and R2 are the ratios of carbon dioxide emission to the supplied power corresponding to power supply sources P1 (e.g., commercial power supply) and P2 (e.g., solar power generation equipment) (see FIG. 3). If it is considered that power supply by solar power generation equipment does not emit carbon dioxide (i.e., R2 = 0), the carbon dioxide emission amount E2 can be expressed as (W4 + W6) × R1.

[0064] Next, a case of continuous processing in which carbon dioxide concentration and carbon compound synthesis are continuously performed will be described.

[0065] 6 is a diagram showing an example of a timeline of carbon dioxide concentration and carbon compound synthesis in the case of continuous processing. As in the case of Fig. 4, the timeline represents, from top to bottom, the supply (input) of exhaust gas, the operation (operation) of the recovery unit 10, the output of carbon dioxide-enriched gas from the recovery unit 10, the supply of carbon dioxide-enriched gas, the operation (operation) of the synthesis unit 11, and the output of carbon compounds from the synthesis unit 11.

[0066] Assume that exhaust gas is continuously supplied to the recovery unit 10 from time t11. Although not shown, when exhaust gas is continuously supplied, there may be irregular periods during which exhaust gas is not supplied. The recovery unit 10 continuously recovers carbon dioxide (concentrates carbon dioxide) from the supplied exhaust gas from time t11. In this case, the operation (driving) period of the recovery unit 10 is divided into predetermined periods (referred to as a first required time in the example of FIG. 6 ). The predetermined period may be one hour, two hours, one day, one week, or the like. That is, in this case, the first required time can be set in advance. Focus on one of the multiple predetermined periods. As shown in FIG. 6 , the amount of power received by the recovery unit 10 during the predetermined period and the power supply source are designated W11 (P1) and W12 (P2). The power supply source P1 is a commercial power source, and the power supply source P2 is a solar power generation facility.

[0067] The recovery unit 10 continuously outputs the carbon dioxide-enriched gas from time t12, which is after ΔT1 has elapsed since time t11, and the output carbon dioxide-enriched gas is supplied to the synthesis unit 11. The time difference ΔT1 may be zero.

[0068] The synthesis unit 11 performs a process of synthesizing carbon compounds from the continuously supplied carbon dioxide-enriched gas. In this case, the operation (driving) period of the synthesis unit 11 is divided into predetermined periods (referred to as the second required time in the example of FIG. 6 ). The predetermined periods are the same as the predetermined period of the recovery unit 10. That is, in this case, the second required time can be set in advance. The amount of power received by the synthesis unit 11 during a predetermined period that is the same as the predetermined period of interest in the recovery unit 10 and the power supply source are designated as W13 (P1) and W14 (P2). The power supply source P1 is a commercial power source, and the power supply source P2 is a solar power generation facility.

[0069] The synthesis unit 11 outputs the carbon compound continuously from time t13, which is ΔT2 after time t12. The same applies to the other predetermined periods.

[0070] FIG. 7 is a diagram showing an example of a method for calculating carbon dioxide emissions in the case of continuous processing. The calculation method illustrated in FIG. 7 is based on the timeline illustrated in FIG. 6. FIG. 7A shows the amount of carbon dioxide emissions required for carbon dioxide concentration by the recovery unit 10. The data server 30 stores exhaust gas information and carbon dioxide-enriched gas information acquired from the operation control device 20 in association with each other. The exhaust gas information is information on the exhaust gas supplied to the recovery unit 10 during the first required time (predetermined period) shown in FIG. 6. The carbon dioxide-enriched gas information is information on the carbon dioxide-enriched gas output from the recovery unit 10 during the first required time.

[0071] The carbon dioxide emission amount E11 required for carbon dioxide concentration by the recovery unit 10 can be expressed by the formula E11 = W11 × R1 + W12 × R2. R1 and R2 are the ratios of carbon dioxide emission to the supplied power corresponding to the power supply sources P1 (e.g., commercial power supply) and P2 (e.g., solar power generation equipment) (see FIG. 3). If it is considered that the power supply from the solar power generation equipment does not emit carbon dioxide (i.e., R2 = 0), the carbon dioxide emission amount E11 can be expressed as W11 × R1. The same applies to the other first required times.

[0072] 7B shows the amount of carbon dioxide emission required for carbon compound synthesis by the synthesis unit 11. The data server 30 stores carbon dioxide-enriched gas information and carbon compound information acquired from the operation control device 20 in association with each other. The carbon dioxide-enriched gas information is information on the carbon dioxide-enriched gas supplied to the synthesis unit 11 during the second required time (predetermined period) shown in FIG. 6. The carbon compound information is information on the carbon compounds output from the synthesis unit 11 during the second required period.

[0073] The carbon dioxide emission amount E12 required for carbon compound synthesis by synthesis unit 11 can be expressed by the formula E12 = W13 x R1 + W14 x R2. R1 and R2 are the ratios of carbon dioxide emission to the supplied power corresponding to power supply sources P1 (e.g., commercial power supply) and P2 (e.g., solar power generation equipment) (see FIG. 3). If it is considered that power supply by solar power generation equipment does not emit carbon dioxide (i.e., R2 = 0), the carbon dioxide emission amount E12 can be expressed as W13 x R1. The same applies to the other second required times.

[0074] As described above, the control unit 51 (carbon dioxide emission calculation unit 58) of the carbon dioxide emission calculation device 50 acquires exhaust gas information of the exhaust gas supplied to the recovery unit 10, and based on the acquired exhaust gas information, determines a first required time required for the recovery unit 10 to convert the supplied exhaust gas into carbon dioxide-enriched gas, and calculates the carbon dioxide emission amount required for carbon dioxide concentration based on power information regarding the power supplied to the recovery unit 10 during the first required time.

[0075] When the flue gas is supplied to the recovery unit 10 as a single batch, the first required time can be the time required for the batch processing (carbon dioxide recovery processing). When the flue gas is continuously supplied to the recovery unit 10, the first required time can be a predetermined time (one hour, two hours, one day, one week, etc.). This makes it possible to determine the amount of carbon dioxide emission required for carbon dioxide concentration, i.e., the amount of carbon dioxide emission when carbon dioxide is recovered from the flue gas. When the processing volume in the former batch processing is large, the amount of carbon dioxide emission can be determined in the same way as in the latter continuous processing.

[0076] The control unit 51 (carbon dioxide emission amount calculation unit 58) may acquire concentrated gas information of the carbon dioxide concentrated gas supplied to the synthesis unit 11, and based on the acquired concentrated gas information, determine a second required time required for the synthesis unit 11 to convert the supplied carbon dioxide concentrated gas into carbon compounds, and calculate the carbon dioxide emission amount required for carbon compound synthesis based on power information regarding the power supplied to the synthesis unit 11 during the second required time.

[0077] In the case where the exhaust gas is supplied to the recovery unit 10 as a single batch of processing, and the carbon dioxide-enriched gas output from the recovery unit 10 is supplied to the synthesis unit 11, the second required time can be the time required to process the batch (synthesis of carbon compounds). In the case where the exhaust gas is continuously supplied to the recovery unit 10, and the carbon dioxide-enriched gas output from the recovery unit 10 is supplied to the synthesis unit 11, the second required time can be a predetermined time (1 hour, 2 hours, 1 day, 1 week, etc.). This makes it possible to grasp the amount of carbon dioxide emission required for carbon compound synthesis.

[0078] The control unit 51 (carbon dioxide recovery amount calculation unit 56) may acquire concentrated gas information of the carbon dioxide concentrated gas converted from exhaust gas by the recovery unit 10, and calculate the amount of carbon dioxide emissions required for carbon dioxide concentration based on the acquired concentrated gas information and the exhaust gas information of the exhaust gas supplied to the recovery unit 10.

[0079] The exhaust gas information includes the composition of the exhaust gas (carbon dioxide, oxygen, nitrogen, etc.), the concentration of each component (e.g., average concentration), and flow rate (e.g., average flow rate). The concentrated gas information includes the carbon dioxide concentration (e.g., average concentration), flow rate (e.g., average flow rate). This makes it possible to know the amount of carbon dioxide emission required for carbon dioxide concentration, i.e., the amount of carbon dioxide contained in the exhaust gas and the carbon dioxide-concentrated gas, and therefore, the amount of carbon dioxide emission when recovering carbon dioxide from the exhaust gas can be accurately determined.

[0080] More specifically, the control unit 51 (carbon dioxide recovery amount calculation unit 56) may calculate a first amount of carbon dioxide contained in the exhaust gas supplied based on the exhaust gas information, calculate a second amount of carbon dioxide contained in the carbon dioxide concentrated gas based on the concentrated gas information, and calculate the amount of carbon dioxide emission required for carbon dioxide concentration based on the calculated first and second amounts of carbon dioxide.

[0081] From the exhaust gas information, the average concentration of carbon dioxide contained in the exhaust gas is 40.01 g / Nm 3 The average flow rate is 20 Nm 3 / min, and the first required time of the recovery unit 10 is 120 min, the amount of carbon dioxide contained in the exhaust gas (first carbon dioxide amount) is 40.01 g / Nm 3 x 120 min x 20 Nm 3 / min = 96024 g = 96.024 kg. From the concentrated gas information, the average concentration of carbon dioxide contained in the carbon dioxide concentrated gas is 400 g / Nm 3 The average flow rate is 2 Nm 3 / min, and the first required time of the recovery unit 10 is 120 min, the amount of carbon dioxide contained in the carbon dioxide concentrated gas (second carbon dioxide amount) is 400 g / Nm 3 x 120 min x 2 Nm 3 / min = 96000g = 96kg.

[0082] As described above, when the first carbon dioxide amount is greater than the second carbon dioxide amount, the difference (first carbon dioxide amount - second carbon dioxide amount) may be added as the carbon dioxide emission amount required for carbon dioxide concentration. In the above numerical example, 96.024 kg - 96 kg = 0.024 kg. This makes it possible to accurately grasp the amount of carbon dioxide emission when recovering carbon dioxide from exhaust gas. The first carbon dioxide amount > second carbon dioxide amount may occur due to gas leakage outside the system during the concentration step or failure to reach the recovery unit equipment due to carbonization.

[0083] It is assumed that the carbon dioxide-enriched gas output from the recovery unit 10 is immediately supplied to the synthesis unit 11. The amount of carbon dioxide-enriched gas supplied to the synthesis unit 11 is 240 Nm 3 (=2 Nm 3 / min × 120 min), the amount of carbon dioxide was 96 kg (2.18 kmol), and the average flow rate of the carbon dioxide-enriched gas was 2 Nm 3 / min(800g-CO 2 Carbon dioxide-enriched gas is sent to the cathode of an electrolytic cell (described later) provided in the synthesis unit 11, and H ions having a molar amount three times that of carbon dioxide are sent to the anode. 2 O has an average flow rate of 982 g / min (= 3 times × 18 g / mol-H 2 O×800g / min÷44g / mol-CO 2 According to the carbon compound information, when an aqueous solution with an average methanol concentration of 64 wt % is produced at an average flow rate of 0.91 kg / min, the amount of methanol contained in the aqueous solution is 109 kg x 0.64 = 69.8 kg (2.18 kmol), which is the same as the number of moles of carbon dioxide contained in the carbon dioxide-enriched gas, and it can be seen that all of the input carbon dioxide was used for methanol synthesis.

[0084] Next, the electrolytic cells provided in the recovery unit 10 and the synthesis unit 11 will be described.

[0085] FIG. 8 is a diagram showing a first example of an electrolytic cell provided in the recovery unit 10. The electrolytic cell (electrochemical cell) shown in FIG. 8 is an SOEC (solid oxide electrolytic cell). When the exhaust gas has a composition of carbon dioxide, oxygen, and nitrogen and the nitrogen content is relatively low, the exhaust gas is introduced into the cathode of an electrolytic cell (SOEC) that uses yttria-stabilized zirconia as an electrolyte. According to the reaction formula of Case 1 shown in FIG. 8, oxygen is converted to oxygen ions (O 2- ) and transported to the anode. This removes oxygen from the cathode or reduces the oxygen concentration. As a result, a concentrated gas of carbon dioxide containing nitrogen but with a low oxygen concentration is discharged from the cathode. If the oxygen concentration is not sufficiently reduced, the gas discharged from the cathode can be reintroduced into the cathode of the electrolytic cell. Case 2 will be described later.

[0086] FIG. 9 is a diagram showing a second example of an electrolytic cell provided in the recovery unit 10. The electrolytic cell (electrochemical cell) shown in FIG. 9 is an MCEC (molten carbonate electrolytic cell). When the exhaust gas has a composition of carbon dioxide, oxygen, and nitrogen and the nitrogen content is relatively high, an MCEC using molten carbonate as an electrolyte is used, and the exhaust gas is introduced into the cathode of the electrolytic cell (MCEC). According to the reaction formula shown in FIG. 9, oxygen and carbon dioxide receive electrons at the cathode, and CO 3 2- The nitrogen becomes ions, moves through the electrolyte, and becomes oxygen and carbon dioxide again at the anode. With the nitrogen removed, carbon dioxide is concentrated at the anode. If it is desired to remove oxygen from this concentrated gas or reduce the oxygen concentration, the concentrated gas is introduced into the cathode of the SOEC electrolytic cell shown in Figure 8. The oxygen concentration can be reduced according to the reaction formula of Case 2 in Figure 8.

[0087] As described above, when carbon dioxide is electrochemically concentrated and recovered using MCEC, oxygen (O 2 ) and carbon dioxide (CO 2 If the amount of oxygen is less than half that of carbon dioxide in terms of molar ratio, some of the carbon dioxide will react with oxygen to form CO 3 2-This is because the oxygen ions cannot move through the electrolyte, resulting in the gas discharged from the cathode to the atmosphere containing a large amount of carbon dioxide. Therefore, when the oxygen concentration in the exhaust gas input to the electrolytic cell is half or less of that of carbon dioxide, the release of carbon dioxide into the atmosphere can be prevented by supplying oxygen gas or oxygen-containing air from the auxiliary material supply unit 13 to the recovery unit 10. When the amount of oxygen is half or more of that of carbon dioxide in terms of molar ratio, the carbon dioxide concentration may decrease, resulting in a decrease in the carbon dioxide reaction rate. In this case, it is preferable to reduce the amount of oxygen using the SOEC shown in FIG. 8 and then recover carbon dioxide using the MCEC.

[0088] The recovery unit 10 may include, in addition to the electrolytic cell, a device using a chemical absorption method, a physical adsorption method, a membrane separation method, or a cryogenic separation method, or may include a device using a combination of these methods. This allows for the production of a highly concentrated carbon dioxide gas.

[0089] FIG. 10 is a diagram showing a first example of an electrolytic cell provided in the synthesis unit 11. The electrolytic cell (electrochemical cell) shown in FIG. 10 is an SOEC (solid oxide electrolytic cell). In the example of FIG. 10, carbon monoxide is synthesized at the cathode of the electrolytic cell. The carbon dioxide-enriched gas recovered in the recovery unit 10 is sent to the cathode of the electrolytic cell provided in the synthesis unit 11 after the composition, composition ratio, gas concentration, etc. are measured by the sensor S7. Here, the carbon dioxide-enriched gas is assumed to be a gas with a high concentration. H2, which is three times the amount of carbon dioxide in molar ratio, is supplied to the cathode of the electrolytic cell from the auxiliary material supply unit 14 as an auxiliary material for carbon compound synthesis. 2 In the SOEC (synthesis unit 11) with yttria-stabilized zirconia as an electrolyte, water and carbon dioxide are reduced at the cathode to produce a mixed gas of hydrogen and carbon monoxide, as shown in Fig. 11. Oxygen is produced at the anode and released into the atmosphere.

[0090] The mixed gas of hydrogen and carbon monoxide produced at the cathode of the electrolysis cell in the synthesis unit 11 is measured for composition, composition ratio, and gas concentration by a sensor S10, and then sent to a synthesis unit 12 equipped with a methane synthesis device. In the methane synthesis device, a catalyst such as a nickel alloy is used to synthesize 3H2 Methane (CH4) is synthesized according to the reaction formula: +CO→CH4+H2O.

[0091] FIG. 11 is a diagram showing a second example of an electrolytic cell provided in the synthesis unit 11. The electrolytic cell (electrochemical cell) shown in FIG. 11 is a DMEC (direct methanol electrolytic cell) that uses an ion exchange membrane as an electrolyte. In the example of FIG. 11, methanol is synthesized at the cathode of the electrolytic cell. The carbon dioxide-enriched gas recovered in the recovery unit 10 is sent to the cathode of the electrolytic cell provided in the synthesis unit 11 after the composition, composition ratio, gas concentration, etc. are measured by sensor S7. Here, the carbon dioxide-enriched gas is a gas in which the concentration of carbon dioxide has been increased by a chemical adsorption method, a physical adsorption method, a membrane separation method, an electrochemical method, or the like. A three-fold molar amount of H is supplied to the cathode of the electrolytic cell from the auxiliary material supply unit 14 as an auxiliary material for carbon compound synthesis. 2 In the DMEC electrolysis cell in which an ion exchange membrane is used as an electrolyte and provided in the synthesis unit 11, carbon dioxide is reduced at the cathode to produce methanol (CH 3 OH) and H 2 At the anode, methanol water containing H 2 O is oxidized to produce oxygen, which is released into the atmosphere.

[0092] 12 is a diagram showing an example of a processing procedure performed by the carbon dioxide emission calculation device 50. For convenience, the following description will be given assuming that the control unit 51 is the main actor in the processing. The control unit 51 acquires exhaust gas information about the exhaust gas supplied to the recovery unit 10 (S11), and identifies the time (first required time) required for the recovery unit 10 to convert the exhaust gas into a carbon dioxide-enriched gas (S12). The first required time may be identified based on an instruction from the operator input via the operator terminal 40.

[0093] The control unit 51 identifies the type of power supply source of the power supplied to the recovery unit 10 within the identified time period (S13). When identifying the type of power supply source, the control unit 51 identifies the amount of power supplied from the identified power supply source to the recovery unit 10. For each identified power supply source, the control unit 51 identifies the ratio of the amount of carbon dioxide emissions to the amount of supplied power (S14), and calculates the amount of carbon dioxide emissions required for carbon dioxide concentration (S15).

[0094] The control unit 51 acquires concentrated gas information of the carbon dioxide concentrated gas supplied to the synthesis unit 11 (S16), and specifies the time (second required time) required for the synthesis unit 11 to synthesize the carbon compound from the carbon dioxide concentrated gas (S17). The second required time may be specified based on an instruction from the operator input via the operator terminal 40.

[0095] The control unit 51 identifies the type of power supply source of the power supplied to the synthesis unit 11 within the identified time period (S18). When identifying the type of power supply source, the control unit 51 identifies the amount of power supplied from the identified power supply source to the synthesis unit 11. For each identified power supply source, the control unit 51 identifies the ratio of the amount of carbon dioxide emissions to the amount of supplied power (S19), calculates the amount of carbon dioxide emissions required for carbon compound synthesis (S20), and ends the process.

[0096] The carbon dioxide emission calculation device 50 of this embodiment can calculate the amount of carbon dioxide emitted when carbon dioxide contained in exhaust gas is electrochemically concentrated and recovered, and the amount of carbon dioxide emitted when carbon compounds are electrochemically synthesized based on the recovered carbon dioxide-enriched gas, thereby making it possible to evaluate the environmental impact of carbon dioxide. Even when power from multiple types of power supply sources is used in the process of electrochemically concentrating and recovering carbon dioxide contained in exhaust gas and the process of electrochemically synthesizing carbon compounds based on the recovered carbon dioxide-enriched gas, the carbon dioxide emission can be easily calculated.

[0097] In this embodiment, the functions of the carbon dioxide emission calculation device 50 may be incorporated into the operator terminal 40 .

[0098] REFERENCE SIGNS LIST 1 Communication network 10 Recovery unit 11, 12 Synthesis unit 13, 14, 15 Auxiliary material supply unit 16, 17, 18 Storage tank 20 Operation control device 21 Control unit 22 Communication unit 30 Data server 40 Operator terminal 50 Carbon dioxide emission calculation device 51 Control unit 52 Communication unit 53 Memory 54 Storage unit 55 Computer program 56 Carbon dioxide recovery amount calculation unit 57 Carbon compound synthesis amount calculation unit 58 Carbon dioxide emission calculation unit 70, 80, 90 Power supply source 71, 81, 91 Power meter

Claims

1. A carbon dioxide emission calculation device comprising a control unit, the control unit acquiring exhaust gas information of exhaust gas supplied to a carbon dioxide capture unit that captures carbon dioxide contained in the exhaust gas, determining a first required time required for the carbon dioxide capture unit to convert the supplied exhaust gas into carbon dioxide-enriched gas based on the acquired exhaust gas information, and calculating an amount of carbon dioxide emission required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide capture unit during the first required time.

2. The carbon dioxide emission calculation device according to claim 1, wherein the control unit acquires concentrated gas information of the carbon dioxide concentrated gas converted from the exhaust gas by the carbon dioxide recovery unit, and calculates the amount of carbon dioxide emission required for carbon dioxide concentration based on the acquired concentrated gas information and exhaust gas information of the exhaust gas supplied.

3. The carbon dioxide emission calculation device of claim 2, wherein the exhaust gas information and concentrated gas information each include a gas concentration and a gas flow rate, and the control unit calculates a first amount of carbon dioxide contained in the exhaust gas supplied based on the exhaust gas information, calculates a second amount of carbon dioxide contained in the carbon dioxide concentrated gas based on the concentrated gas information, and calculates an amount of carbon dioxide emission required for carbon dioxide concentration based on the calculated first and second amounts of carbon dioxide.

4. The carbon dioxide emission calculation device according to claim 1, wherein the power information includes the ratio of carbon dioxide emissions to the amount of power supplied by each type of power supply source, and the amount of power supplied by each power supply source to the carbon dioxide capture unit or carbon compound synthesis unit at a specified time.

5. A carbon dioxide emission calculation device as described in any one of claims 1 to 4, wherein the control unit acquires concentrated gas information of carbon dioxide concentrated gas supplied to a carbon compound synthesis unit that synthesizes carbon compounds, determines a second required time required for the carbon compound synthesis unit to convert the supplied carbon dioxide concentrated gas into carbon compounds based on the acquired concentrated gas information, and calculates the amount of carbon dioxide emission required for carbon compound synthesis based on power information regarding the power supplied to the carbon compound synthesis unit during the second required time.

6. The carbon dioxide emission calculation device according to claim 5, wherein the power information regarding the power supplied to the carbon compound synthesis unit during the second required time includes a ratio of carbon dioxide emission to the amount of power supplied for each type of power supply source.

7. A carbon dioxide emission calculation device as described in claim 5, comprising: a first memory unit that stores, in association with each other, exhaust gas information of the exhaust gas supplied to the carbon dioxide recovery unit, and concentrated gas information of the carbon dioxide-enriched gas supplied to a carbon compound synthesis unit that synthesizes the carbon compounds; and a second memory unit that stores power information including a ratio of carbon dioxide emission to the amount of supplied power for each type of power supply source, wherein the control unit obtains a selection of at least one of the type of power supply source within a first required time required for the carbon dioxide recovery unit to convert the supplied exhaust gas into carbon dioxide-enriched gas, and the type of power supply source within a second required time required for the carbon compound synthesis unit to convert the supplied carbon dioxide-enriched gas into carbon compounds, and calculates the amount of carbon dioxide emission required for at least one of carbon dioxide concentration and carbon compound synthesis based on the type of power supply source selected.

8. A computer program that causes a computer to execute the following processes: acquire exhaust gas information of exhaust gas supplied to a carbon dioxide capture unit that captures carbon dioxide contained in the exhaust gas; identify a first required time required for the carbon dioxide capture unit to convert the supplied exhaust gas into carbon dioxide-enriched gas based on the acquired exhaust gas information; and calculate the amount of carbon dioxide emissions required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide capture unit during the first required time.

9. A method for calculating carbon dioxide emissions, comprising: acquiring exhaust gas information of exhaust gas supplied to a carbon dioxide capture unit that captures carbon dioxide contained in the exhaust gas; determining a first required time required for the carbon dioxide capture unit to convert the supplied exhaust gas into carbon dioxide-enriched gas based on the acquired exhaust gas information; and calculating the amount of carbon dioxide emissions required for carbon dioxide concentration based on power information regarding the power supplied to the carbon dioxide capture unit during the first required time.

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