DAC System

Abstract

To provide a DAC system which enables a plurality of DAC devices to be disposed close to each other while preventing deterioration of CO2 recovery efficiency of each of the plurality of DAC devices.SOLUTION: A DAC system according to the disclosure includes: a first DAC (direct air capture) device which recovers CO2 from atmospheric air; a second DAC device which is installed so that a suction port is located at the exhaust port side of the first DAC device and configured to recover CO2 from atmospheric air; and a stirring plate which is installed between the first DAC device and the second DAC device and configured to stir air exhausted from the exhaust port of the first DAC device and atmospheric air.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to DAC systems. [Background technology]

[0002] In recent years, development of a Direct Air Capture (DAC) device that captures CO2 from the atmosphere has been progressing. Non-Patent Document 1 describes the capture of CO2 from the atmosphere using multiple DAC devices. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] "Direct Air Capture of CO2 with Chemicals", A Technology Assessment for the APS Panel on Public Affairs, Jun 1, 2011 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration disclosed in Non-Patent Document 1, when multiple DAC devices are placed close to each other in order to place as many DAC devices as possible in a given area, the air discharged from one DAC device after CO2 capture is taken in by another DAC device placed near the exhaust port of the DAC device, and the other DAC device performs CO2 capture processing on air with a low CO2 concentration, resulting in a problem of reduced CO2 capture efficiency by the other DAC device. Therefore, in the configuration disclosed in Non-Patent Document 1, multiple DAC devices have to be placed far apart.

[0005] The present disclosure has been made in consideration of the above background, and aims to provide a DAC system that enables multiple DAC devices to be arranged in close proximity to each other while preventing a decrease in the CO2 capture efficiency of each of the multiple DAC devices. [Means for solving the problem]

[0006] The DAC system according to the present disclosure includes a first DAC (Direct Air Capture) device that captures CO2 from the atmosphere, a second DAC device that is installed so that its intake port is located on the exhaust port side of the first DAC device and captures CO2 from the atmosphere, and a stirring plate that is installed between the first DAC device and the second DAC device and stirs the air discharged from the exhaust port of the first DAC device and the atmosphere. This DAC system can prevent a decrease in CO2 capture efficiency due to the second DAC device adjacent to the first DAC device by using the stirring plate to stir the air with CO2 captured and discharged from the exhaust port of the first DAC device. As a result, in this DAC system, it is possible to arrange the first DAC device and the second DAC device close to each other. In other words, in this DAC system, it is possible to arrange multiple DAC devices close to each other while preventing a decrease in CO2 capture efficiency due to each of the multiple DAC devices. Effect of the Invention

[0007] The present disclosure makes it possible to provide a DAC system that enables multiple DAC devices to be arranged in close proximity to each other while preventing a decrease in the CO2 capture efficiency of each of the multiple DAC devices. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 illustrates a first exemplary configuration of a DAC system according to a first embodiment. [Diagram 2] 5A to 5C are diagrams illustrating experimental results for explaining the effects of the DAC system according to the first embodiment. [Diagram 3] FIG. 13 is a diagram illustrating a second configuration example of the DAC system according to the first embodiment. [Figure 4] FIG. 13 is a diagram illustrating a third configuration example of the DAC system according to the first embodiment. [Diagram 5] FIG. 11 illustrates a fourth configuration example of the DAC system according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be described below through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. In addition, not all of the configurations described in the embodiments are necessarily essential means for solving the problems. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. In each drawing, the same elements are given the same reference numerals, and repeated explanations are omitted as necessary.

[0010] <Embodiment 1> FIG. 1 is a diagram showing a first configuration example of a DAC system 1 according to the first embodiment. The DAC system 1 according to the present embodiment can prevent a decrease in CO2 recovery efficiency caused by a second DAC device adjacent to the first DAC device by using a stirring plate to stir the air from which CO2 (carbon dioxide) has been recovered and discharged from the exhaust port of the first DAC device. As a result, the DAC system 1 according to the present embodiment can arrange the first DAC device and the second DAC device close to each other. In other words, the DAC system 1 according to the present embodiment can arrange the multiple DAC devices close to each other while preventing a decrease in the CO2 recovery efficiency caused by each of the multiple DAC devices. This will be described in detail below.

[0011] 1, the DAC system 1 includes at least a DAC device 11_1, a DAC device 11_2, and a stirring plate 12. Each of the DAC devices 11_1 and 11_2 has a porous solid absorbent material having a property of separating and collecting CO2 from the atmosphere, for example.

[0012] The DAC device 11_1 is installed, for example, in a well-ventilated area, draws in air containing CO2 from an intake port provided at the front, and exhausts air with CO2 collected from an exhaust port provided at the rear. The DAC device 11_2 is installed at the rear of the DAC device 11_1 (i.e., near the exhaust port of the DAC device 11_1), draws in air from an intake port provided at the front, and exhausts air with CO2 collected from an exhaust port provided at the rear.

[0013] Here, in the DAC system 1, it is preferable to arrange the DAC devices 11_1 and 11_2 closely to increase the CO2 capture efficiency by arranging as many DAC devices as possible per a given area. However, when the DAC devices 11_1 and 11_2 are arranged closely to each other, the air discharged from the DAC device 11_1 after CO2 capture is taken in by the DAC device 11_2, so that the DAC device 11_2 performs the CO2 capture process on air with a low CO2 concentration, and as a result, the CO2 capture efficiency by the DAC device 11_2 may decrease.

[0014] Therefore, in the DAC system 1, a mixing plate 12 for mixing the air from which CO2 has been captured and discharged from the exhaust port of the DAC device 11_1 with the atmosphere is provided between the DAC device 11_1 and the DAC device 11_2. The mixing plate 12 is a plate-shaped member having a size large enough to change the direction of the air flow.

[0015] In the example of FIG. 1, the stirring plate 12 is provided so that a part of the atmosphere above the air discharged from the exhaust port of the DAC device 11_1 descends toward the air discharged from the exhaust port of the DAC device 11_1. More specifically, the stirring plate 12 is provided between the DAC device 11_1 and the DAC device 11_2 so that one end E1 on the side closer to the DAC device 11_1 is located in an area higher than the exhaust port of the DAC device 11_1, and the other end E2 on the side closer to the DAC device 11_2 is located in an area lower than the one end E1. The stirring plate 12 is supported by a support rod or the like (not shown). As a result, the air with a low CO2 concentration discharged from the exhaust port of the DAC device 11_1 and the air with a high CO2 concentration are mixed near the intake port of the DAC device 11_2, so that the DAC device 11_2 can maintain a high CO2 recovery efficiency. Also, as a result, the DAC system 1 can arrange the DAC device 11_1 and the DAC device 11_2 close to each other. That is, in the DAC system 1, it becomes possible to arrange the DAC devices 11_1 and 11_2 in close proximity to each other while preventing a decrease in the CO2 capture efficiency of each of the DAC devices 11_1 and 11_2.

[0016] Fig. 2 is a diagram showing the results of an experiment to explain the effect of the DAC system 1. Fig. 2 shows the relationship between the distance from the exhaust port of the DAC device 11_1 and the CO2 concentration in the atmosphere. As shown in Fig. 2, when the stirring plate 12 is provided, the CO2 concentration in the atmosphere increases to the CO concentration before CO2 capture in an area closer to the exhaust port of the DAC device 11_1 than when the stirring plate 12 is not provided.

[0017] 3 is a diagram showing a second configuration example of the DAC system 1 as DAC system 1a. In DAC system 1a, the installation position of the stirring plate 12 is different from that of DAC system 1. The other configurations of DAC system 1a are the same as those of DAC system 1, so the description thereof will be omitted.

[0018] In the example of FIG. 3, the stirring plate 12 is provided so that the air discharged from the exhaust port of the DAC device 11_1 rises toward the atmosphere at a higher layer than the air. More specifically, the stirring plate 12 is provided between the DAC device 11_1 and the DAC device 11_2 so that one end E1 on the side closer to the DAC device 11_1 is located in an area facing the exhaust port of the DAC device 11_1, and the other end E2 on the side closer to the DAC device 11_2 is located in an area higher than the one end E1. The stirring plate 12 is supported by a support rod or the like (not shown). As a result, the air with a low CO2 concentration discharged from the exhaust port of the DAC device 11_1 and the atmosphere with a high CO2 concentration are mixed near the intake port of the DAC device 11_2, so that the DAC device 11_2 can maintain a high CO2 recovery efficiency. Also, as a result, the DAC system 1a can arrange the DAC device 11_1 and the DAC device 11_2 close to each other. That is, in the DAC system 1a, it is possible to arrange the DAC devices 11_1 and 11_2 in close proximity to each other while preventing a decrease in the CO2 capture efficiency of each of the DAC devices 11_1 and 11_2.

[0019] 4 is a diagram showing a third configuration example of the DAC system 1 as DAC system 1b. In DAC system 1b, the installation position of the stirring plate 12 is different from that of DAC system 1. The other configurations of DAC system 1b are the same as those of DAC system 1, so the description thereof will be omitted.

[0020] In the example of FIG. 4, a pair of stirring plates 12 are provided. Each stirring plate 12 is provided between the DAC device 11_1 and the DAC device 11_2 in a top view (viewed from the z-axis direction), such that one end E1 on the side closer to the DAC device 11_1 is located in an area outside the flow path R1 from the DAC device 11_1 to the DAC device 11_2, and the other end E2 on the side closer to the DAC device 11_2 is located in an area closer to the flow path R1 than the one end E1. The flow path R1 may be replaced with a line segment connecting the DAC devices 11_1 and 11_2. Each stirring plate 12 is supported by a support rod or the like (not shown). As a result, the air with a low CO2 concentration discharged from the exhaust port of the DAC device 11_1 and the air with a high CO2 concentration are mixed near the intake port of the DAC device 11_2, so that the DAC device 11_2 can maintain a high CO2 recovery efficiency. This also enables the DAC system 1b to arrange the DAC device 11_1 and the DAC device 11_2 close to each other. That is, in the DAC system 1b, it becomes possible to arrange the DAC devices 11_1 and 11_2 close to each other while preventing a decrease in the CO2 capture efficiency of each of the DAC devices 11_1 and 11_2.

[0021] 5 is a diagram showing a fourth configuration example of the DAC system 1 as a DAC system 1c. In the DAC system 1c, the installation position of the stirring plate 12 is different from that of the DAC system 1. The other configurations of the DAC system 1c are the same as those of the DAC system 1, so the description thereof will be omitted.

[0022] In the example of FIG. 5, the stirring plate 12 is provided between the DAC device 11_1 and the DAC device 11_2, in a top view (viewed from the z-axis direction), such that one end E1 on the side closer to the DAC device 11_1 is located in an area facing the exhaust port of the DAC device 11_1, and the other end E2 on the side closer to the DAC device 11_2 is located in an area outside the flow path R1 from the DAC device 11_1 to the DAC device 11_2. The stirring plate 12 is supported by a support rod or the like (not shown). As a result, the air with a low CO2 concentration discharged from the exhaust port of the DAC device 11_1 and the air with a high CO2 concentration are mixed near the intake port of the DAC device 11_2, so that the DAC device 11_2 can maintain a high CO2 recovery efficiency. Also, as a result, the DAC system 1c can arrange the DAC device 11_1 and the DAC device 11_2 close to each other. That is, in the DAC system 1c, it becomes possible to arrange the DAC devices 11_1 and 11_2 in close proximity to each other while preventing a decrease in the CO2 capture efficiency of each of the DAC devices 11_1 and 11_2.

[0023] In this way, the DAC system 1 according to this embodiment can prevent a decrease in CO2 capture efficiency caused by the DAC device 11_2 adjacent to the DAC device 11_1 by using the stirring plate 12 to stir the air in which CO2 has been captured and discharged from the exhaust port of the DAC device 11_1. As a result, the DAC device 11_1 and the DAC device 11_2 can be arranged close to each other. In other words, the DAC system 1 according to this embodiment can prevent a decrease in the CO2 capture efficiency caused by each of the DAC devices 11_1 and 11_2 and can arrange the DAC devices 11_1 and 11_2 close to each other.

[0024] In the present embodiment, the DAC system 1 is described as having two DAC devices 11_1-11_2 and one or a set of stirring plates 12, but is not limited thereto. The DAC system 1 may further include a DAC device 11_3 in the rear stage of the DAC device 11_2 (i.e., in the vicinity of the exhaust port of the DAC device 11_2), and may further include a stirring plate 13 similar to the stirring plate 12 between the DAC devices 11_2 and 11_3.

[0025] The DAC system 1 may also include a plurality of DAC devices 11_1 arranged in the horizontal direction (x-axis direction), a plurality of DAC devices 11_2 arranged in the horizontal direction at the rear of each of the plurality of DAC devices 11_1 (i.e., near the exhaust ports of each of the plurality of DAC devices 11_1), and a plurality or a plurality of sets of stirring plates 12 provided between the plurality of DAC devices 11_1 and the plurality of DAC devices 11_2. The DAC system 1 may also include a plurality of DAC devices 11_3 arranged in the horizontal direction at the rear of each of the plurality of DAC devices 11_2 (i.e., near the exhaust ports of each of the plurality of DAC devices 11_2), and a plurality or a plurality of sets of stirring plates 13 provided between the plurality of DAC devices 11_2 and the plurality of DAC devices 11_3.

[0026] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. The present invention contributes to carbon neutrality, decarbonization, and Sustainable Development Goals (SDGs). [Explanation of symbols]

[0027] 1,1a,1b,1c DAC system, 11_1,11_2,11_3 DAC device 12,13 Stirring plate E1 One end of the stirring plate 12 E2 The other end of the stirring plate 12 R1 flow path

Claims

1. A first DAC (Direct Air Capture) device that captures CO2 from the atmosphere; A second DAC device is installed so that an intake port is located on the exhaust port side of the first DAC device and recovers CO2 from the atmosphere; a stirring plate disposed between the first DAC device and the second DAC device for stirring air discharged from an exhaust port of the first DAC device and atmospheric air; The DAC system includes:

2. The stirring plate is provided such that one end on the side close to the first DAC device is located in an area higher than the exhaust port of the first DAC device and the other end is located in an area lower than the one end, so that a part of the atmosphere in a layer above the air discharged from the exhaust port of the first DAC device descends toward the air discharged from the exhaust port of the first DAC device.

2. The DAC system of claim 1.

3. The stirring plate is provided such that one end on the side close to the first DAC device is located in an area facing the exhaust port of the first DAC device, and the other end is located in an area higher than the one end, so that the air discharged from the exhaust port of the first DAC device rises toward the atmosphere in a layer higher than the air.

2. The DAC system of claim 1.

4. The stirring plate is provided such that, when viewed from above, one end on the side closer to the first DAC device is located in an area outside the flow path from the first DAC device to the second DAC device, and the other end is located in an area closer to the flow path than the one end.

2. The DAC system of claim 1.

5. The stirring plate is provided such that, when viewed from above, one end on a side closer to the first DAC device is located in an area facing the exhaust port of the first DAC device, and the other end is located in an area outside the flow path from the first DAC device to the second DAC device.

2. The DAC system of claim 1.

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