Carbon dioxide absorption device

Abstract

To provide a carbon dioxide absorption device capable of improving carbon dioxide reaction efficiency and an air cleaner.SOLUTION: A carbon dioxide absorption device 100 includes: a fan 50; an air cleaning filter 30 through which air flows by driving the fan 50; an absorption unit 20 in which an absorption filter 21 for absorbing carbon dioxide is accommodated, the absorption unit 20 through which air flows by driving the fan 50; and a casing 10. In the carbon dioxide absorption device 100, first wind speed that is speed of the air passing through the absorption unit 20 is a value that is 0.02 m / s or larger and smaller than 0.50 m / s.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a carbon dioxide absorbing device and an air purifier. [Background technology]

[0002] In recent years, environmental protection activities have been actively promoted in society. In particular, efforts to capture carbon dioxide, which is considered to be the cause of global warming, are being made by companies and public organizations.

[0003] For example, Patent Document 1 discloses an air purifier equipped with a carbon dioxide fixation filter, a main filter, and a fan. When the fan is driven, air entering from an air intake passes through the carbon dioxide fixation filter, the main filter, and is discharged from an exhaust port. The carbon dioxide fixation filter adsorbs and fixes carbon dioxide from the air passing through. The main filter adsorbs suspended dust from the air passing through. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-68164 Summary of the Invention [Problem to be solved by the invention]

[0005] In an air purifier capable of adsorbing carbon dioxide and a carbon dioxide absorption device such as that described in Patent Document 1, it is desired to improve the reaction efficiency (absorption efficiency) of carbon dioxide.

[0006] This disclosure has been made to solve the above-mentioned problems, and aims to provide a carbon dioxide absorbing device and an air purifier that are capable of improving the reaction efficiency of carbon dioxide. [Means for solving the problem]

[0007] In order to achieve the above object, the carbon dioxide absorption device according to the first aspect of the present disclosure disclosed below comprises an absorption filter containing a hydroxide that absorbs carbon dioxide, and a housing in which the absorption filter is arranged, and the housing has a first wind speed, which is the wind speed of air passing through the absorption filter, of 0.02 m / s or more and less than 0.50 m / s.

[0008] An air purifier according to a second aspect of the present disclosure comprises a fan, an air purification section through which air is ventilated when driven by the fan, and an absorption unit housing an absorption filter that absorbs carbon dioxide, the absorption unit through which air is ventilated when driven by the fan, and a housing in which the fan, the air purification section, and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when driven by the fan, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when driven by the fan, is higher than the first wind speed.

[0009] An air purifier according to a third aspect of the present disclosure comprises a first fan, a second fan, an air purification section through which air is ventilated when the first fan is driven, an absorption unit housing an absorption filter that absorbs carbon dioxide, and through which air is ventilated when the second fan is driven, and a housing in which the first fan, the second fan, the air purification section, and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the second fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the first fan is driven, is higher than the first wind speed. Effect of the Invention

[0010] According to the above configuration, the reaction efficiency of carbon dioxide can be improved. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view showing the configuration of an air purifier 100 according to the first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a schematic configuration of the absorption filter 21. As shown in FIG. [Diagram 3] FIG. 3 is a diagram for explaining an air passage from the intake port 11 to the exhaust port 12 according to the first embodiment. [Figure 4] FIG. 4 is a diagram showing an example of the rotation of the damper 60. As shown in FIG. [Diagram 5] FIG. 5 is a block diagram of an air purifier 100 according to the first embodiment. [Figure 6] FIG. 6 is a block diagram showing the configuration of an air purifier 200 according to the second embodiment. [Figure 7] FIG. 7 is a diagram for explaining the configuration of a damper 260 according to the second embodiment. [Figure 8] FIG. 8 is a diagram illustrating the configuration of an air purifier 300 according to the third embodiment. [Figure 9] FIG. 9 is a cross-sectional view illustrating the configuration of an air purifier 300 according to the third embodiment. [Figure 10] FIG. 13 is a diagram illustrating the configuration of an air purifier 500 according to the fourth embodiment. [Figure 11] FIG. 11 is a graph showing the relationship between the speed of air passing through the absorbing member and reaction efficiency. [Figure 12A] FIG. 12A is a diagram summarizing the measurement results. [Figure 12B] FIG. 12B is a diagram for explaining the saturated reaction rate. [Figure 13] FIG. 13 is a diagram illustrating the configuration of an air purifier 400 according to a first modified example of the first to fourth embodiments. [Figure 14] FIG. 14 is a diagram for explaining the configuration of a carbon dioxide absorbing device 600 according to a second modified example of the first to fourth embodiments. [Figure 15] FIG. 15 is a diagram for explaining the configuration of a carbon dioxide absorbing device 700 according to a third modified example of the first to fourth embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present disclosure will be described based on the drawings. Note that the present disclosure is not limited to the following embodiments, and appropriate design changes can be made within the scope of the configuration of the present disclosure. In addition, in the following description, the same parts or parts having similar functions are commonly used with the same reference numerals in different drawings, and repeated description thereof will be omitted. In addition, each configuration described in the embodiment and the modified example may be appropriately combined or modified. In addition, in order to make the description easier to understand, in the drawings referred to below, the configuration is shown simplified or schematic, and some components are omitted.

[0013] [First embodiment] (Overall configuration of air purifier 100) FIG. 1 is a cross-sectional view showing the configuration of an air purifier 100 according to the first embodiment.

[0014] The air purifier 100 according to the first embodiment is a device that removes dust particles from the air (purifies the air) and removes (absorbs and collects) carbon dioxide from the air. The air purifier 100 may be placed indoors or outdoors as a standalone device, or may be incorporated into other devices (such as vehicles, aircraft, ships, air conditioning equipment, and vending machines). When the air purifier 100 is placed outdoors, it is preferable that the housing 10 of the air purifier 100 is waterproof, but when the location is not subject to rain or snow, the housing 10 does not need to be waterproof.

[0015] (Configuration of each part of the air purifier 100) As shown in FIG. 1, the air purifier 100 includes a housing 10. The housing 10 is provided with an intake port 11, an exhaust port 12, an opening 13, a maintenance door 14, and wheels 15. In the first embodiment, the intake port 11 is formed on the bottom surface of the housing 10. The intake port 11 introduces air from the outside of the housing 10 into the housing 10. The exhaust port 12 is formed on the top surface of the housing 10. The exhaust port 12 exhausts air from inside the housing 10 to the outside of the housing 10. The opening 13 is formed on the side surface of the housing 10. In the first embodiment, the opening 13 introduces air from the outside of the housing 10 into an air passage 80 inside the housing 10. The maintenance door 14 is configured to be opened and closed by rotating by a hinge not shown. In the following description, the horizontal plane is defined as an XY plane, and the directions in the XY plane are defined as an X1 direction, an X2 direction, a Y1 direction, and a Y2 direction as shown in FIG. 1. Moreover, the upward direction is defined as the Z1 direction, and the downward direction is defined as the Z2 direction.

[0016] As shown in FIG. 1, the air purifier 100 includes an absorption unit 20, an air cleaning filter 30, nonwoven fabric filters 41 and 42, a fan 50, and a damper 60.

[0017] The absorption unit 20 is provided with one or more absorption filters 21. Although three absorption filters 21 are illustrated in FIG. 1, two or less or four or more absorption filters 21 may be provided in the absorption unit 20. For example, the absorption filters 21 are arranged in a vertical line. The absorption filters 21 have the same shape. This can reduce the manufacturing cost of the absorption filters 21. The absorption filters 21 are configured so that they can be individually taken out of the housing 10 with the maintenance door 14 open in the X2 direction. For example, the absorption filters 21 are arranged in the housing 10 so that they can slide toward the maintenance door 14 (X2 direction). This allows only the absorption filters 21 to be replaced among the absorption filters 21, and the number of absorption filters 21 arranged in the absorption unit 20 to be changed depending on the situation. As a result, the absorption filters 21 can be easily replaced, and the absorbing members 21a can be easily recycled.

[0018] In the first embodiment, the absorption unit 20 is disposed in a lower portion of the housing 10. Moreover, the absorption unit 20 is disposed upstream of the airflow generated by the fan 50 with respect to the air cleaning filter 30.

[0019] FIG. 2 is a cross-sectional view showing a schematic configuration of the absorption filter 21. As shown in FIG. 2, the absorption filter 21 is a filter that absorbs carbon dioxide. The absorption filter 21 includes an absorption member 21a that absorbs carbon dioxide and a case portion 21b that accommodates the absorption member 21a. The absorption member 21a is, for example, a hydroxide-based carbon dioxide absorbent. The absorption member 21a includes a hydroxide that absorbs carbon dioxide by chemical reaction. That is, the absorption member 21a is a member that removes carbon dioxide from the air by chemically reacting with carbon dioxide in the air when it comes into contact with air. The member that absorbs carbon dioxide by chemical reaction includes a calcium-based material. The calcium-based material is, for example, calcium hydroxide. In addition to a method using a chemical reaction, there is a method of absorbing carbon dioxide by physically adsorbing carbon dioxide molecules into the pores of the absorption member without causing a chemical reaction. For example, there is a method of adsorbing carbon dioxide molecules to a porous material such as zeolite. In the method of physically adsorbing carbon dioxide molecules to the absorbing member, a step of desorbing carbon dioxide from the absorbing member and changing the desorbed carbon dioxide into a solid is required, and the number of steps required to convert carbon dioxide into a solid increases. In contrast, according to the configuration of the first embodiment, by using a member that absorbs carbon dioxide through a chemical reaction, carbon dioxide can be collected in a solid (powder) state in which carbon dioxide has been chemically changed. This makes it easier to reuse carbon dioxide than in the method of physically adsorbing carbon dioxide molecules to the absorbing member. Note that hydroxides other than calcium hydroxide may be contained in the absorbing member 21a. For example, sodium hydroxide, magnesium hydroxide, ammonium hydroxide, or potassium hydroxide may be contained in the absorbing member 21a. The absorbing member 21a has a cylindrical shape, an average diameter Φ of 2 mm or more and 3 mm or less, and a length (height) of 5.0 mm.

[0020] In addition, when calcium hydroxide is used for the absorbing member 21a, calcium carbonate can be generated by absorbing carbon dioxide into the calcium hydroxide. The generated calcium carbonate can be used to generate raw materials for various recycled products.

[0021] The absorbing member 21a may also contain a dye such as methyl violet. In this case, the absorbing member 21a is configured to change color in response to a change in pH caused by the amount of absorbed carbon dioxide. In this case, for example, the absorbing member 21a changes from "white" to "red, purple, or pink" when it absorbs carbon dioxide. The absorbing member 21a may be one that changes from "red or purple" to "white or pink" when it absorbs carbon dioxide, or one that changes to a color other than the above.

[0022] The absorbing member 21a is formed in a granular shape. As shown in FIG. 3, a plurality of the absorbing members 21a are arranged in the case portion 21b. By forming the absorbing member 21a from a solid, it is easier to handle than a liquid, and when a user replaces the absorption filter 21, the absorbing member 21a is less likely to adhere to the user. The case portion 21b has an air hole (not shown) or is formed in a breathable mesh shape. As a result, the case portion 21b allows the outside air to come into contact with the absorbing member 21a in the case portion 21b.

[0023] 2, a two-dimensional code 21c is attached to the absorption filter 21. The two-dimensional code 21c is, for example, a QR code (registered trademark). The absorption unit 20 may be provided with a one-dimensional code (barcode) instead of the two-dimensional code 21c, or may be provided with an electric circuit capable of storing information, such as an IC chip. The two-dimensional code 21c can be used as the "two-dimensional code" described in Japanese Patent Publication No. 7189644, for example.

[0024] The air purifying filter 30 is, for example, a filter that captures dust. A HEPA filter can be used as the air purifying filter 30. As shown in FIG. 1, the air purifying filter 30 is disposed between the absorption unit 20 and the fan 50. The air purifying filter 30 is disposed downstream of the airflow generated by the fan 50 with respect to the absorption unit 20 (the upper part of the housing 10). As a result, even if a part of the absorbing member 21a is released from the absorption unit 20, the absorbing member 21a is captured by the air purifying filter 30, and the absorbing member 21a can be prevented from being released outside the air purifier 100.

[0025] The nonwoven fabric filters 41 and 42 have higher breathability than the air cleaning filter 30, and prevent foreign matter and dust from entering the housing 10. The nonwoven fabric filter 41 is disposed upstream of the absorption unit 20 in the airflow. The nonwoven fabric filter 42 is disposed on the intake side of the air cleaning filter 3.

[0026] The fan 50 is driven by the supply of power, and as shown in FIG. 3, it draws air into the housing 10 through the intake port 11 and the opening 13, and exhausts the air to the outside of the housing 10 through the exhaust port 12. For example, a sirocco fan can be used as the fan 50, but it may also be a propeller fan, a turbo fan, or the like. In addition, in the first embodiment, a fan 50 is used in which, when the power consumption of the fan 50 is converted into carbon dioxide, the converted amount of carbon dioxide is less than the amount of carbon dioxide that can be absorbed by the absorption unit 20. Note that the inside of the damper 60 (the ventilation path 80) is under negative pressure because the fan 50 is located downstream. Therefore, air is not discharged to the outside of the housing 10 without passing through the air purification filter 30.

[0027] FIG. 3 is a diagram for explaining an air passage from the intake port 11 to the exhaust port 12 according to the first embodiment. As shown in FIG. 3, the intake port 11, the nonwoven fabric filter 41, the absorption unit 20, the damper 60 and the opening 13, the nonwoven fabric filter 42, the air cleaning filter 30, the fan 50, and the exhaust port 12 are arranged in this order in the housing 10 from the upstream side of the airflow. The "airflow" is an air flow generated by driving the fan 50. Note that, by driving one fan 50, an airflow A1 flows in the order of the intake port 11, the nonwoven fabric filter 41, the absorption unit 20, the damper 60 and the opening 13, the nonwoven fabric filter 42, the air cleaning filter 30, the fan 50, and the exhaust port 12, and an airflow A2 flows in the order of the opening 13 (damper 60), the nonwoven fabric filter 42, the air cleaning filter 30, the fan 50, and the exhaust port 12. Thus, in the first embodiment, both the airflow A1 and the airflow A2 pass through the air purification filter 30, and only the airflow A1 passes through the absorption unit 20. This makes it possible to make the air volume passing through the air purification filter 30 larger than the air volume passing through the absorption unit 20. As a result, it is possible to improve the air purification function of the air purifier 100. Furthermore, in the air purifier 100 of the first embodiment, the fan 50 for ventilating the air purification filter 30 and the fan 50 for ventilating the absorption unit 20 can be a common fan.

[0028] As shown in FIG. 1, the housing 10 has an air intake 11, a nonwoven fabric filter 41, an absorption unit 20, a damper 60 and an opening 13, a nonwoven fabric filter 42, an air purification filter 30, a fan 50, and an exhaust vent 12 arranged in this order from top to bottom.

[0029] The opening 13 introduces air from outside the housing 10 into the ventilation path 80 between the absorption unit 20 and the air cleaning filter 30. When the fan 50 is driven, the ventilation path 80 becomes negative pressure (negative pressure) with respect to the outside of the housing 310, and air from outside the housing 10 enters the ventilation path 80 through the opening 13. FIG. 4 is a diagram showing an example of the rotation of the damper 60. The damper 60 is configured to change the opening degree of the opening 13 by changing the position (angle) of the flap. The "opening degree" is larger as the pressure loss for the air passing through the opening 13 is smaller, and is smaller as the pressure loss for the air passing through the opening 13 is larger. Reducing the "opening degree" means, for example, blocking a part of the opening 13 with the damper 60 or moving the damper 60 to a position (angle) that obstructs the flow of air. For example, in the example of FIG. 4, the damper 60 moves from position P2 to position P1. Increasing the "opening degree" means, for example, opening the opening 13 with the damper 60 or moving the damper 60 to a position (angle) that does not impede the air flow. For example, in the example of Fig. 4, the damper 60 moves from position P2 to position P3. Note that, although six dampers 60 are illustrated in Fig. 1, the number of dampers 60 may be five or less or seven or more.

[0030] FIG. 5 is a block diagram of the air purifier 100 according to the first embodiment. The air purifier 100 includes a control circuit 70, a storage unit 71, and a sheet number sensor 72. The storage unit 71 includes a non-volatile storage circuit (memory). The storage unit 71 stores information in which the number of absorption filters 21 arranged in the absorption unit 20 is associated with the position of the damper 60. For example, the position of the damper 60 is set so that the first wind speed, which is the wind speed of air passing through the absorption unit 20, is 0.02 m / s or more and 0.15 m / s or less, and the second wind speed, which is the wind speed of air passing through the air cleaning filter 30, is 0.3 m / s or more and 0.5 m / s or less. The first wind speed may be a value of 0.02 m / s or more and less than 0.50 m / s, but in this case, the second wind speed is set higher than the first wind speed. The first wind speed may be equal to or greater than 0.02 m / s and less than 0.25 m / s, but in this case, the second wind speed is set to be higher than the first wind speed.

[0031] The number sensor 72 is disposed in the absorption unit 20. The number sensor 72 detects the number of absorption filters 21 in the absorption unit 20. For example, the number sensor 72 is a contact sensor. The number sensor 72 may be a non-contact sensor (optical or magnetic sensor). The number sensor 72 transmits information on the detected number to the control circuit 70. In the example of FIG. 4, the control circuit 70 acquires the number of absorption filters 21 from the number sensor 72. Then, when the number of absorption filters 21 is "three", the control circuit 70 controls the driving of the damper 60 so that the damper 60 is disposed at position P1. In the first embodiment, the damper 60 is provided with a driving device such as a motor. Furthermore, when the number of absorption filters 21 is "two", the control circuit 70 controls the driving of the damper 60 so that the damper 60 is disposed at position P2. When the number of absorption filters 21 is "one", the control circuit 70 controls the driving of the damper 60 so that the damper 60 is disposed at position P3.

[0032] The information associating the above positions P1 to P3 with the number of absorption filters 21 is prepared in advance at the design stage of the air purifier 100. For example, the fan 50 is operated with the maximum number of absorption filters 21 arranged in the absorption unit 20 and with the air purification filter 30 attached to the housing 10. The position of the damper 60 is recorded such that the wind speed passing through the absorption filters 21 is the air volume at which the absorption efficiency of the absorption filters 21 is maximized. This position is associated with the maximum number. Then, one absorption filter 21 is removed from the absorption unit 20, and the position of the damper 60 is recorded such that the wind speed passing through the absorption filter 21 is the air volume at which the absorption efficiency of the absorption filter 21 is maximized. By repeating this, information associating the positions P1 to P3 with the number of absorption filters 21 is created.

[0033] The damper 60 can adjust the amount of air passing through the opening 13 (the difference between the amount of air passing through the air purification filter 30 and the amount of air passing through the absorption unit 20). As a result, even if the number of absorption filters 21 in the absorption unit 20 is changed, air is supplied at an appropriate wind speed, and the reaction efficiency of carbon dioxide can be improved.

[0034] [Second embodiment] Next, the configuration of an air purifier 200 according to a second embodiment will be described with reference to Fig. 6 and Fig. 7. In the second embodiment, a damper 260 of the air purifier 200 is configured so that the position can be changed manually. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0035] Fig. 6 is a block diagram showing the configuration of an air purifier 200 according to a second embodiment. Fig. 7 is a diagram for explaining the configuration of a damper 260 according to the second embodiment. As shown in Fig. 6, the air purifier 200 includes a control circuit 270. The control circuit 270 turns on and off the operation of the fan 50 and increases or decreases the air volume of the fan 50 in response to an input operation on an operation panel (not shown), but does not control the damper 260.

[0036] As shown in Fig. 7, a damper 260 is disposed in the housing 210 of the air purifier 200. The position of the damper 260 is not changed by wind passing through the opening 13 (see Fig. 1), but is configured so that the position can be changed manually. "Manually" means that the position can be changed while being held by the hand of a person (user), for example. The damper 260 moves, for example, between positions P1, P2, and P3 shown in Fig. 7.

[0037] In the second embodiment, the housing 210 is provided with a mark 261 that corresponds the number of absorption filters 21 arranged in the absorption unit 20 to the position of the damper 260. The mark 261 is, for example, a line on the extension line of the flap (wing) of the damper 60 in the housing 210, and a character or mark indicating the number of absorption filters 21 (for example, "1", "2", "3", etc.). This allows the damper 260 to be moved in accordance with the mark 261, so that even when the position of the damper 260 is manually switched, the position of the damper 260 can be adjusted so that the wind speed passing through the absorption filters 21 becomes an appropriate value. Other configurations and effects are similar to those of the first embodiment.

[0038] [Third embodiment] Next, the configuration of an air purifier 300 according to a third embodiment will be described with reference to Fig. 8 and Fig. 9. In the third embodiment, an air purification filter 330 is disposed upstream of the airflow from the absorption unit 320. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0039] FIG. 8 is a diagram for explaining the configuration of an air purifier 300 according to a third embodiment. As shown in FIG. 8, the air purifier 300 includes a fan 350, an air purifying filter 330, a damper 360, an opening 313, and an absorbing unit 320. In addition, in the housing 310, the intake port 11, the nonwoven fabric filter 41, the fan 350, the air purifying filter 330, the damper 360 (opening 313), the nonwoven fabric filter 42, the absorbing unit 320, and the exhaust port 12 are arranged in this order from the upstream side of the airflow A11 generated by driving the fan 350. In addition, as shown in FIG. 9, the nonwoven fabric filter 41, the fan 350, the air purifying filter 330, the damper 360 (opening 313), the nonwoven fabric filter 42, the absorbing unit 320, and the exhaust port 12 are arranged in this order from the bottom of the housing 310. In addition, the opening 313 opens upward in the third embodiment. The absorption filter 21 of the absorption unit 320 is placed on a breathable mesh 315 .

[0040] In the third embodiment, the opening 313 is disposed downstream of the fan 350. As a result, the opening 313 discharges air from the ventilation path 380 between the air cleaning filter 330 and the absorption unit 320 to the outside of the housing 310 via the damper 360. Due to the presence of the absorption unit 320 on the downstream side of the ventilation path 380, the ventilation path 380 becomes positive pressure relative to the outside of the housing 310, and air flows out of the housing 310 from the opening 313. As a result, when the fan 350 is driven, an airflow A12 is generated that flows in the order of the intake port 11, the nonwoven fabric filter 41, the air cleaning filter 330, the fan 350, the damper 360 (opening 313), and the outside of the housing 310. As a result, both the airflow A11 and the airflow A12 pass through the air cleaning filter 330, and only the airflow A11 passes through the absorption unit 320. As shown in FIG. 9, the dimensions of the damper 360 are larger than the dimensions of the damper 60 in the first embodiment, and the dimensions of the opening 313 are larger than the dimensions of the opening 13 in the first embodiment.

[0041] According to the air purifier 300 of the third embodiment, even when the air purifier 300 is placed in a dusty industrial facility such as a welding farm, air from which dust and the like has been removed by the air cleaning filter 330 passes through the absorption unit 320. This makes it possible to prevent the absorption unit 320 from becoming clogged with dust and the like. Other configurations and effects are similar to those of the first embodiment.

[0042] [Fourth embodiment] Next, the configuration of an air purifier 500 according to a fourth embodiment will be described with reference to Fig. 10. The fourth embodiment includes a first fan 551 that passes air through an air purification filter 530, and a second fan 552 that passes air through an absorption unit 520. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0043] As shown in Fig. 10, the air purifier 500 includes a housing 510, a first fan 551, a second fan 552, an air cleaning filter 530, an absorption unit 520, and nonwoven fabric filters 541 and 542. The housing 510 is provided with an air cleaning intake 511a, an absorption unit intake 511b, an air cleaning exhaust 514a, and an absorption unit exhaust 514b. In the upper part of the housing 510, the air cleaning intake 511a, the nonwoven fabric filter 542, the air cleaning filter 530, the first fan 551, and the air cleaning exhaust 514a are arranged in this order from the upstream side of the airflow A32 generated by driving the first fan 551. In addition, in the lower part of the housing 510, an intake port 511b for the absorption unit, a nonwoven fabric filter 541, the absorption unit 520, the second fan 552, and an exhaust port 514b for the absorption unit are arranged in this order from the upstream side of the airflow A31 generated by driving the second fan 552.

[0044] The air volume of the second fan 552 and the housing 510 are configured so that the first wind speed, which is the wind speed of the air passing through the absorption unit 520, is 0.02 m / s or more and 0.15 m / s or less by driving the second fan 552. The air volume of the first fan 551 and the housing 510 are configured so that the second wind speed, which is the wind speed of the air passing through the air cleaning filter 530, is 0.3 m / s or more and 0.5 m / s or less by driving the first fan 551. The first wind speed may be a value of 0.02 m / s or more and less than 0.50 m / s, but in this case, the second wind speed is set higher than the first wind speed. The first wind speed may be a value of 0.02 m / s or more and less than 0.25 m / s, but in this case, the second wind speed is set higher than the first wind speed. Other configurations and effects are the same as those of the first embodiment.

[0045] [Measurement results] Next, the measurement results of the reaction efficiency η when air is passed through the absorbing member will be described with reference to Fig. 11 and Fig. 12A. Fig. 11 is a diagram showing the relationship between the wind speed when air is passed through the absorbing member and the reaction efficiency. Fig. 12A is a diagram summarizing the measurement results.

[0046] Here, an absorbent member mainly composed of calcium hydroxide (Ca(OH)2) was prepared. An absorbent member having a cylindrical shape with an average diameter Φ of 2.0 mm and a length (height) of 5.0 mm, and an absorbent member having a cylindrical shape with an average diameter Φ of 3.0 mm and a length (height) of 5.0 mm were prepared. In addition to calcium hydroxide, the absorbent member contained 0.8% to 0.9% sulfur trioxide (SO3), 0.5% magnesium oxide (MgO), 0.2% aluminum oxide (Al2O3), and trace amounts of silicon dioxide (SiO2).

[0047] The ratio (reaction rate) of calcium carbonate was measured in a state where air was passed through a prepared absorbent member having an average diameter of Φ2.0 mm for 100 hours at wind velocities of 0.12 m / s, 0.15 m / s, 0.16 m / s, 0.18 m / s, and 0.2 m / s (hereinafter referred to as "passing wind speed v"). In addition, the ratio (reaction rate) of calcium carbonate was measured in a state where air was passed through a prepared absorbent member having an average diameter of Φ3.0 mm for 100 hours at passing wind speeds v of 0.3 m / s, 0.4 m / s, and 0.5 m / s. The "reaction efficiency η" means the ratio (reaction rate) of calcium carbonate when air is passed through the absorbent member at the passing wind speed v for a predetermined time (100 hours in this embodiment). The weight percentage of calcium carbonate (CaCO3) can be calculated by multiplying the percentage (%) of carbon dioxide detected by the gas volumetric method by 100.09 and dividing it by 44.01 (in Figure 11, this is shown as the "actual value").

[0048] The measured reaction efficiency η of an absorber with an average diameter of Φ2.0 mm was 90% when the passing wind speed v was 0.12 m / s, 88% when the passing wind speed v was 0.15 m / s, 80% when the passing wind speed v was 0.16 m / s, 78% when the passing wind speed v was 0.18 m / s, and 75% when the passing wind speed v was 0.2 m / s. The measured reaction efficiency η of an absorber with an average diameter of Φ3.0 mm was 64% when the passing wind speed v was 0.3 m / s, 60% when the passing wind speed v was 0.4 m / s, and 51% when the passing wind speed v was 0.5 m / s.

[0049] Here, the reaction efficiency η when the passing wind speed v is 0.2 m / s is estimated to be 67% from the measured value of the reaction efficiency η of the absorbing member with an average diameter of Φ3.0 mm. Therefore, it was found that for the same passing wind speed v, the reaction efficiency η (75%) of the absorbing member with an average diameter of Φ2.0 mm is greater than the reaction efficiency η (67%) of the absorbing member with an average diameter of Φ3.0 mm. Note that the reaction efficiency η when the passing wind speed v is 0.2 m / s is estimated by adding the increase in reaction efficiency η when the passing wind speed v is 0.3 m / s compared to 0.4 m / s to the reaction efficiency η at 0.3 m / s.

[0050] In addition, for the absorbent member with an average diameter of Φ2.0 mm, an "estimated value" of the "reaction efficiency η" was calculated. The "estimated value" is calculated by using the weight of the absorbent member when calcium hydroxide reacts 100% (when all calcium hydroxide is converted to calcium carbonate) as the denominator and the weight of calcium carbonate (CaCO3) as the numerator. For example, first, the weight and moisture content of the absorbent member before the reaction are measured, and the weight of the absorbent member before the reaction with the moisture content removed (referred to as the "dry weight before reaction"). Then, the weight and moisture content of the absorbent member after the reaction are measured, and the weight of the absorbent member after the reaction with the moisture content removed (referred to as the "dry weight after reaction"). In addition, the weight of the absorbent member before the reaction is completely reacted (when all calcium hydroxide is converted to calcium carbonate), "maximum weight after reaction", is calculated. That is, since the number of moles of calcium hydroxide before the reaction is 74 and the number of moles of calcium carbonate after the reaction is 100, "dry weight before reaction" ÷ 74 × 100 = "maximum weight after reaction". The reaction efficiency η calculated as "reaction efficiency η" = "dry weight after reaction" / "maximum weight after reaction" is shown as an estimated value in Figure 11. Each estimated value was higher than the actual measured value.

[0051] In FIG. 12A, the passing wind speed v at which the reaction efficiency η is 80% or more is marked with "◎", the passing wind speed v at which the reaction efficiency η is 70% or more and less than 80% is marked with "〇", the passing wind speed v at which the reaction efficiency η is 50% or more and less than 70% is marked with "△", and the passing wind speed v at which the reaction efficiency η is less than 50% is marked with "×". As shown in FIG. 12A, when the passing wind speed v is 0.02 m / s or more and less than 0.15 m / s, it is marked with "◎", and it was found that the reaction efficiency η is the highest. In addition, when the passing wind speed v is 0.02 m / s or more and less than 0.18 m / s, it is marked with "◎" or "〇", and it was found that the reaction efficiency η is high. In addition, when the passing wind speed v is less than 0.50 m / s, it is marked with "◎", "〇", or "△", and it was found that the reaction efficiency η is higher than when the passing wind speed v is 0.50 m / s or more.

[0052] FIG. 11 and FIG. 12A show the results of reaction efficiency η, but after air is passed through for 100 hours, the reaction speed decreases and the reaction rate becomes saturated (the reaction rate in a saturated state is called the "saturated reaction rate"). As shown in FIG. 12B, for example, if the reaction is further carried out at a passing air speed v at which the reaction efficiency η (reaction rate per 100 hours) is 80%, the saturated reaction rate will be 95%. Also, if the reaction is further carried out at a passing air speed v at which the reaction efficiency η (reaction rate per 100 hours) is 60%, the saturated reaction rate will be 73%. Thus, the higher the passing air speed v with respect to the reaction efficiency η, the higher the saturated reaction rate will be.

[0053] Here, when the absorbent member after the reaction is used as a raw material for a recycled product (such as glass material, fertilizer, and cement), the higher the percentage of calcium carbonate, the higher the quality of the recycled product and the raw material for the recycled product. Therefore, if the passing air speed v is set to 0.02 m / s or more and less than 0.18 m / s, the reaction efficiency is 70% or more. As a result, for example, in an absorption filter that has been reacted for a predetermined period, the percentage of calcium carbonate is 70% or more. As a result, when calcium carbonate is used as a raw material for a recycled product, the quality of the recycled product and the raw material for the recycled product is improved. Also, if the passing air speed v is set to 0.02 m / s or more and less than 0.15 m / s, the reaction efficiency is 80% or more. As a result, for example, in an absorption filter that has been reacted for a predetermined period, the percentage of calcium carbonate is 80% or more. As a result, when calcium carbonate is used as a raw material for a recycled product, the quality of the recycled product and the raw material for the recycled product is improved.

[0054] [Variations] As described above, the above-described embodiments are merely examples for implementing the present disclosure. Therefore, the present disclosure is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments without departing from the spirit of the present disclosure.

[0055] (1) In the above first to fourth embodiments, an air purification filter (HEPA filter) is used as the air purification unit, but the present disclosure is not limited to this. For example, a filter other than a HEPA filter (e.g., a mist filter) may be used as the air purification unit, or an electric dust collector may be used.

[0056] (2) In the above first to fourth embodiments, the fan is disposed downstream of the air cleaning filter, but the present disclosure is not limited thereto. For example, as in an air purifier 500 according to a modified example shown in Fig. 13, the fan 450, the absorption unit 420, the damper 460 (opening 413), and the air cleaning filter 430 may be disposed in this order from the upstream side of the airflow A21. In this case, an airflow A22 is generated in which air is introduced from the opening 413 into the ventilation path 480 between the absorption unit 420 and the air cleaning filter 430.

[0057] (3) In the above first to fourth embodiments, the damper is configured to rotate, but the present disclosure is not limited to this. For example, the damper may be configured to slide.

[0058] (4) In the above first to fourth embodiments, an example in which a nonwoven fabric filter is provided has been shown, but the present disclosure is not limited to this. A nonwoven fabric filter does not have to be disposed in the housing, and a type of filter other than a nonwoven fabric filter (for example, a mesh filter) may be disposed in the housing.

[0059] (5) In the above first to fourth embodiments, as shown in Fig. 1, an example (vertical placement type) in which the housing is configured so that the airflow flows from bottom to top is shown, but the present disclosure is not limited to this. The housing may be configured so that the airflow flows from top to bottom, or the housing may be configured so that the airflow flows from one side to the other side (horizontal placement type).

[0060] (6) In the first to fourth embodiments, the damper is moved between three positions P1 to P3, but the present disclosure is not limited to this. For example, the damper may be configured to move between two positions: a position that opens the opening and a position that closes the opening.

[0061] (7) In the third embodiment, the fan, the air purifying filter, and the absorption unit are arranged in this order from the upstream side of the airflow inside the housing, but the present disclosure is not limited to this. For example, the air purifying filter, the fan, and the absorption unit may be arranged in this order from the upstream side of the airflow inside the housing.

[0062] (8) In the above first to fourth embodiments, an air purifier is given as an example, but the present disclosure is not limited thereto. For example, as shown in FIG. 14, the carbon dioxide absorbing device 600 may be configured. The carbon dioxide absorbing device 600 includes a housing 610, a nonwoven fabric filter 641, an absorption unit 620, and a fan 650. The nonwoven fabric filter 641, the absorption unit 620, and the fan 650 are arranged in the housing 610 in this order from the air intake 613 side. The wind speed of the airflow A41 generated by driving the fan 650 passing through the absorption unit 620 is a value of 0.02 m / s or more and less than 0.15 m / s. This wind speed may be a value of 0.02 m / s or more and less than 0.50 m / s. According to this configuration, a carbon dioxide absorbing device 600 with high reaction efficiency can be provided.

[0063] (9) In the above first to fourth embodiments, an example in which a fan is provided has been shown, but the present disclosure is not limited thereto. For example, as in the carbon dioxide absorbing apparatus 700 of the example shown in FIG. 15, in an environment in which the exhaust port 714 is in a negative pressure relative to the intake port 713 and the passing wind speed v is a value of 0.02 m / s or more and less than 0.50 m / s, a fan is not necessary, and the absorption unit 720 may be provided. For example, the carbon dioxide absorbing apparatus 700 may be disposed at a position where an airflow generated when a mobility (moving body: a vehicle (automobile, train), aircraft, ship) moves flows, or may be disposed at the boundary between the inside and outside of an aircraft, and the pressure difference between the pressure outside the aircraft and the pressure inside the aircraft may be utilized. In addition, the carbon dioxide absorbing apparatus 700 may be disposed under an airflow generated by another air conditioner or the like. For example, the carbon dioxide absorbing apparatus of the present disclosure may be applied to an air conditioner, a ventilator, an air conditioning duct, a private power generator, or an emergency power generator that utilizes a fan or a compressor. The carbon dioxide absorbing device of the present disclosure may also be applied to the inside of an aircraft, a clean room, an exhaust or intake port of a negative pressure room, or the interior of the negative pressure room, where airflow is created by a pressure difference. The carbon dioxide absorbing device of the present disclosure may also be applied to something that takes in air by being attached to a helmet, a car body, a fan, or other moving object. The carbon dioxide absorbing device of the present disclosure may also be configured to utilize natural airflow.

[0064] (10) In the above first to fourth embodiments, the absorbent member is formed to have a cylindrical shape, the average diameter Φ is 2 mm or more and 3 mm or less, and the length (height) is 5.0 mm, but the present disclosure is not limited to this. That is, the absorbent member may be formed to have a shape other than a cylindrical shape (e.g., a spherical shape, a rectangular prism shape, etc.), the average diameter Φ may be less than 2 mm and greater than 3 mm, and the length (height) may be less than 5.0 mm and 5.1 mm or more.

[0065] The above-mentioned carbon dioxide absorbing device and air purifier can be explained as follows.

[0066] The air purifier according to the first configuration includes an absorption filter containing a hydroxide that absorbs carbon dioxide, and a housing in which the absorption filter is disposed. The housing has a first wind speed, which is the wind speed of air passing through the absorption filter, of a value of 0.02 m / s or more and less than 0.50 m / s (first configuration). In the first configuration, the first wind speed may be a value of 0.02 m / s or more and less than 0.18 m / s (second configuration). In the second configuration, the first wind speed may be a value of 0.02 m / s or more and less than 0.15 m / s (third configuration).

[0067] According to the first to third configurations, the reaction efficiency of carbon dioxide can be improved. Here, when a material reacted with hydroxide is used as a raw material for a recycled product, the higher the ratio of the material reacted with hydroxide, the higher the quality of the recycled product and the raw material for the recycled product. According to the second configuration, the reaction efficiency is 70% or more. According to the third configuration, the reaction efficiency is 80% or more. As a result, for example, in an absorption filter that has been reacted for a predetermined period of time, the ratio of the material reacted with hydroxide is 70% or more (80% or more in the case of the third configuration). As a result, according to the second and third configurations, when a material reacted with hydroxide is used as a raw material for a recycled product, the quality of the recycled product and the raw material for the recycled product is improved.

[0068] An air purifier according to a fourth configuration comprises a fan, an air purification section through which air is ventilated when the fan is driven, and an absorption unit housing an absorption filter containing an absorption filter containing a hydroxide that absorbs carbon dioxide, the absorption unit through which air is ventilated when the fan is driven, and a housing in which the fan, the air purification section and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the fan is driven, is higher than the first wind speed (fourth configuration).

[0069] According to the fourth configuration, it is possible to improve the air purification function while improving the reaction efficiency of carbon dioxide.

[0070] In the fourth configuration, the housing may include an opening for introducing air from outside the housing into an air passage through which air flows from the absorption unit to the air purification section, or for exhausting air from the air passage through which air flows from the air purification section to the absorption unit to the outside of the housing, and a damper for changing the opening degree of the opening (fifth configuration).

[0071] The absorption of carbon dioxide by the absorption filter is more efficient as the wind speed passing through the absorption filter is smaller. On the other hand, the larger the air volume passing through the air purification filter, the larger the amount of purified air, and the improved air purification function. According to the above configuration, the opening introduces air from outside the housing into the ventilation path through which air flows from the absorption unit to the air purification section, or exhausts air from the ventilation path through which air flows from the air purification section to the absorption unit to the outside of the housing. This makes it possible to make the air volume passing through the air purification section larger than the air volume passing through the absorption unit. As a result, the amount of purified air increases, and the air purification function can be improved. The amount of air passing through the opening (the difference between the air volume passing through the air purification section and the air volume passing through the absorption unit) can be adjusted by the damper. As a result, air is supplied to the absorption unit at an appropriate wind speed, and the reaction efficiency of carbon dioxide can be improved.

[0072] In the fifth configuration, the absorption unit may be configured to accommodate one or more absorption filters. The absorption unit may be configured to allow the one or more absorption filters to be individually detachable (sixth configuration).

[0073] According to the sixth configuration, it is possible to replace only those absorption filters that need to be replaced among the plurality of absorption filters, and it is also possible to standardize the absorption filters.

[0074] In a sixth configuration, the air purifier may further include a control unit that controls the operation of the damper, and a storage unit that stores information that associates the number of the absorption filters arranged in the absorption unit with the position of the damper. The control unit obtains the number of the absorption filters arranged in the absorption unit, refers to the information based on the number of the absorption filters, and changes the position of the damper (seventh configuration).

[0075] The greater the number of absorption filters, the greater the pressure loss in the absorption unit. However, if the wind speed passing through the absorption unit changes, the carbon dioxide absorption efficiency in the absorption unit decreases. In contrast, according to the seventh configuration, the position of the damper is changed according to the number of absorption filters, so that the wind speed passing through the absorption filters can be set to an appropriate value even if the number of absorption filters is changed.

[0076] In the sixth configuration, the damper may be configured so that a position of the damper can be manually changed. The housing may be provided with a mark that indicates the number of the absorption filters arranged in the absorption unit and the position of the damper in correspondence with each other (eighth configuration).

[0077] According to the eighth configuration, the damper can be moved in accordance with the mark, so that even when the damper position is switched manually, the damper position can be adjusted so that the wind speed passing through the absorption filter becomes an appropriate value.

[0078] In any one of the fifth to eighth configurations, the housing may include the absorption unit, the damper, the air purifying section, and the fan, arranged in this order from the upstream side of the airflow generated by driving the fan. The opening may be configured to introduce air from outside the housing via the damper into the ventilation path through which air flows from the absorption unit to the air purifying section (ninth configuration).

[0079] According to the ninth configuration, in addition to the air that has passed through the absorption unit, air controlled by the damper is supplied to the air purification section, which allows a larger amount of air to pass through the air purification section.

[0080] In a tenth configuration, the absorption unit, the damper, the air purifying section, and the fan may be arranged in this order in the housing toward the top. A maintenance door for replacing the absorption filter in the absorption unit may be provided on a side surface of the housing (tenth configuration).

[0081] According to the tenth configuration, the absorption filter can be easily replaced through the maintenance door provided on the side of the housing.

[0082] In any one of the fifth to eighth configurations, the housing may include the fan, the air purifying section, the damper, and the absorption unit, arranged in this order from the upstream side of an airflow generated by driving the fan. The opening may be configured to exhaust air from the ventilation path through which air flows from the air purifying section to the absorption unit, via the damper, to the outside of the housing (eleventh configuration).

[0083] According to the eleventh configuration, even when the air purifier is used in an environment with a lot of polluted air, purified air is supplied to the absorption unit, thereby making it possible to prevent the absorption unit from becoming clogged with dust or the like.

[0084] The air purifier of the 12th configuration comprises a first fan, a second fan, an air purification section through which air is ventilated when the first fan is driven, an absorption unit housing an absorption filter containing an absorption filter containing a hydroxide that absorbs carbon dioxide, and through which air is ventilated when the second fan is driven, and a housing in which the first fan, the second fan, the air purification section and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the second fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the first fan is driven, is higher than the first wind speed (11th configuration).

[0085] According to the eleventh aspect, the air purification function can be improved while improving the reaction efficiency of carbon dioxide. [Explanation of symbols]

[0086] 3: air purifying filter, 10: housing, 11: intake port, 12: exhaust port, 13: opening, 14: maintenance door, 15: wheels, 20: absorption unit, 21: absorption filter, 21a: absorption member, 21b: case, 21c: two-dimensional code, 30: air purifying filter, 41: nonwoven fabric filter, 42: nonwoven fabric filter, 50: fan, 60: damper, 70: control circuit, 71: memory unit, 72: number sensor, 8 0: ventilation path, 100: air purifier, 200: air purifier, 210: housing, 260: damper, 261: mark, 270: control circuit, 300: air purifier, 310: housing, 313: opening, 315: mesh, 320: absorption unit, 330: air purification filter, 350: fan, 360: damper, 380: ventilation path, 400: air purifier, 413: opening, 420: absorption unit, 430: air purification filter filter, 450: fan, 460: damper, 480: ventilation path, 500: air purifier, 510: housing, 511a: air purifier intake port, 511b: absorption unit intake port, 514a: air purifier exhaust port, 514b: absorption unit exhaust port, 520: absorption unit, 530: air purifier filter, 541: nonwoven fabric filter, 542: nonwoven fabric filter, 551: first fan, 552: second fan, 600 : Carbon dioxide absorption device, 610: Housing, 613: Air intake, 620: Absorption unit, 641: Nonwoven fabric filter, 650: Fan, 700: Carbon dioxide absorption device, 713: Air intake, 714: Air exhaust, 720: Absorption unit, A1: Air flow, A11: Air flow, A12: Air flow, A2: Air flow, A21: Air flow, A22: Air flow, A31: Air flow, A32: Air flow, A41: Air flow, v: Passing wind speed, Φ: Average diameter, η: Reaction efficiency

Claims

1. an absorption filter containing a hydroxide that absorbs carbon dioxide; A housing in which the absorption filter is disposed, The carbon dioxide absorbing device, wherein the housing has a first wind speed, which is the wind speed of air passing through the absorption filter, having a value of 0.02 m / s or more and less than 0.50 m / s.

2. The carbon dioxide absorbing apparatus according to claim 1 , wherein the first wind speed is equal to or greater than 0.02 m / s and less than 0.18 m / s.

3. The carbon dioxide absorbing apparatus according to claim 2 , wherein the first wind speed is equal to or greater than 0.02 m / s and less than 0.15 m / s.

4. With fans, an air purifying section in which air is ventilated by driving the fan; an absorption unit that houses an absorption filter containing a hydroxide that absorbs carbon dioxide, and through which air is ventilated by driving the fan; a housing in which the fan, the air purifying section, and the absorption unit are disposed, An air purifier in which a first wind speed, which is the wind speed of air passing through the absorption unit as the fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section as the fan is driven, is higher than the first wind speed.

5. The housing includes: an opening for introducing air from outside the housing into an air passage through which air flows from the absorption unit to the air purification unit, or for discharging air from the air passage through which air flows from the air purification unit to the absorption unit to the outside of the housing; The air purifier according to claim 4 , further comprising: a damper that changes an opening degree of the opening.

6. The absorption unit is configured to accommodate one or more absorption filters; The air purifier according to claim 5 , wherein the absorption unit is configured so that the one or more absorption filters are individually detachable.

7. A control unit for controlling the operation of the damper; A storage unit storing information in which the number of absorption filters arranged in the absorption unit and the position of the damper are associated with each other, The control unit is Obtaining the number of the absorption filters arranged in the absorption unit; The air purifier according to claim 6, wherein the position of the damper is changed by referring to the information based on the number of the absorption filters.

8. The damper is configured so that a position of the damper can be manually changed, The air purifier according to claim 6 , wherein the housing is provided with a mark indicating the number of the absorption filters arranged in the absorption unit and the position of the damper in correspondence with each other.

9. the absorption unit, the damper, the air purifying unit, and the fan are disposed in this order in the housing from an upstream side of an airflow generated by driving the fan, The air purifier according to claim 5 , wherein the opening introduces air from outside the housing via the damper into the ventilation path through which air flows from the absorption unit to the air purification section.

10. The absorption unit, the damper, the air purifying unit, and the fan are arranged in this order in the housing from top to bottom, The air purifier according to claim 9 , wherein a maintenance door for replacing the absorption filter in the absorption unit is provided on a side surface of the housing.

11. the housing has the fan, the air purifying unit, the damper, and the absorption unit disposed in this order from an upstream side of an airflow generated by driving the fan, The air purifier according to claim 5 , wherein the opening exhausts air from the ventilation path through which air flows from the air purification section to the absorption unit to the outside of the housing via the damper.

12. The first fan, With the second fan, an air purifying unit in which air is ventilated by driving the first fan; an absorption unit that accommodates an absorption filter containing a hydroxide that absorbs carbon dioxide, and through which air is ventilated by driving the second fan; a housing in which the first fan, the second fan, the air purifying section, and the absorption unit are arranged, An air purifier in which a first wind speed, which is the wind speed of air passing through the absorption unit as the second fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section as the first fan is driven, is higher than the first wind speed.

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