Adsorption device

Abstract

To provide an adsorption device which enables miniaturization.SOLUTION: An adsorption device 100 includes a suction part 10 for sucking gas, a first exhaust part 11 and a second exhaust part 12 for exhausting the gas, a pressure adjustment part 37 for adjusting a pressure, an adsorption part 40 having an adsorbent 42 enabling adsorption of carbon dioxide and desorption of the carbon dioxide by pressure reduction arranged therein, a switching part 36 for switching a flow channel 20 of the gas, and a control part 6. The control part 6 executes first operation of making the gas sucked from the suction part 10 pass through inside the adsorption part 40, and exhausting the gas from the first exhaust part 11, and second operation of switching the flow channel 20 of the gas by the switching part 36, reducing the pressure inside the adsorption part 40 by the pressure adjustment part 37, and thereby exhausting the gas inside the adsorption part 40 from the second exhaust part 12.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an adsorption device. [Background technology]

[0002] Conventionally, the technology described in Patent Document 1 is known as an adsorption device. Specifically, the adsorption device (device 300) described in Patent Document 1 includes a condenser 202, dehumidification chambers 204 and 304, contact chambers 206 and 306, and a vacuum chamber 208. The dehumidification chamber 204 and the contact chamber 206 form a first collection assembly 310, and the dehumidification chamber 304 and the contact chamber 306 form a second collection assembly 312. The device 300 introduces air from which moisture has been removed in the condenser 202 and the dehumidification chamber 204 into the contact chamber 206, adsorbs (absorbs) carbon dioxide from the air, and releases the adsorbed carbon dioxide to the vacuum chamber 208. The device 300 also closes the first collection assembly 310 and opens the second collection assembly 312, thereby performing dehumidification by the dehumidification chamber 304 and adsorption of carbon dioxide by the contact chamber 306. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-56329 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration disclosed in Patent Document 1, multiple contact chambers and dehumidification chambers are provided, and the device for adsorbing carbon dioxide and dehumidifying air is large. In addition, if the amount of material for adsorbing carbon dioxide in the contact chamber increases, there is a concern that the device will become larger and the cost will increase. Therefore, it is desirable to adsorb carbon dioxide efficiently.

[0005] The present disclosure is a technology completed based on the above circumstances, and has an object to provide an adsorption device that can be miniaturized and that can efficiently adsorb carbon dioxide. [Means for solving the problem]

[0006] The adsorption device of the present disclosure comprises an intake section that draws in gas, first and second exhaust sections that exhaust the gas, a pressure adjustment section that adjusts pressure, an adsorption section having an adsorbent disposed therein that is capable of adsorbing carbon dioxide and desorbing carbon dioxide by reducing pressure, a switching section that switches the gas flow path, and a control section, and the control section performs a first operation in which the gas drawn in from the intake section is passed through the inside of the adsorption section and exhausted from the first exhaust section, and a second operation in which the gas flow path is switched by the switching section and the inside of the adsorption section is reduced pressure by the pressure adjustment section, thereby exhausting the gas inside the adsorption section from the second exhaust section. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide an adsorption device that can be miniaturized and that can efficiently adsorb carbon dioxide. [Brief description of the drawings]

[0008] [Figure 1] Schematic diagram of a vehicle according to embodiment 1. [Diagram 2] Schematic diagram of adsorption device [Diagram 3] A block diagram showing the electrical configuration of the suction device. [Figure 4] A flowchart showing the flow of control by the control unit. [Diagram 5] Schematic diagram of an adsorption device according to embodiment 2 [Figure 6] Table showing the values ​​in Examples 6 to 8 and Comparative Examples 1 and 2 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First, embodiments of the present disclosure will be listed and described. (1) The adsorption device of the present disclosure comprises an intake section that draws in gas, first and second exhaust sections that exhaust the gas, a pressure adjustment section that adjusts pressure, an adsorption section having an adsorbent disposed therein that is capable of adsorbing carbon dioxide and desorbing the carbon dioxide by reducing the pressure, a switching section that switches the gas flow path, and a control section, wherein the control section performs a first operation in which the gas drawn in from the intake section is passed through the inside of the adsorption section and exhausted from the first exhaust section, and a second operation in which the gas flow path is switched by the switching section and the inside of the adsorption section is reduced in pressure by the pressure adjustment section, thereby exhausting the gas inside the adsorption section from the second exhaust section.

[0010] (2) In the adsorption apparatus described in (1), the control unit may be configured to pressurize the inside of the adsorption unit by the pressure adjustment unit so that the inside of the adsorption unit is at 2 atmospheres or more during the first operation.

[0011] (3) The adsorption device described in (1) or (2) may include a humidity adjustment unit that adjusts humidity, and the control unit may adjust the relative humidity inside the adsorption unit to be 40% or more and 80% or less during the first operation using the humidity adjustment unit.

[0012] (4) In the adsorption apparatus according to any one of (1) to (3), the control unit may execute the first operation and, after a predetermined time has elapsed, execute the second operation.

[0013] (5) The adsorption device described in any one of (1) to (4) may be arranged in a vehicle, the intake section intakes gas from within the vehicle cabin, the first exhaust section exhausts gas into the vehicle cabin, and the second exhaust section exhausts gas to the outside of the vehicle cabin.

[0014] (6) In the suction device described in (5), the control unit may perform the first operation when the power of the vehicle is ON, and perform the second operation when the power of the vehicle is OFF.

[0015] (7) In the adsorption device described in (5), the vehicle may be equipped with a detection unit that detects the presence or absence of an occupant, and the control unit may perform the first operation when the detection unit detects an occupant, and perform the second operation when the detection unit does not detect an occupant.

[0016] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to FIG. 1 and the like. In this embodiment, a vehicle adsorption device (adsorption device) 100 disposed in an automobile (vehicle) 1 will be described. As shown in FIG. 1 and FIG. 2, the automobile 1 includes a door 2 having a door panel 3 made of sheet metal and a resin door trim 4 attached to the door panel 3 from the inside of the vehicle compartment, and a carbon dioxide adsorption device 100. As shown in FIG. 2, the adsorption device 100 is disposed between the door panel 3 and the door trim 4 in a space S2. However, in FIG. 1, for convenience, the adsorption device 100 is shown above the automobile 1. Also, in FIG. 2, the arrow IN is the direction toward the inside of the vehicle compartment (inside of the vehicle compartment), the arrow OUT is the direction toward the outside of the vehicle compartment (outside of the vehicle compartment), the inside of the vehicle compartment of the door trim 4 is the inside of the vehicle S1, and the outside of the vehicle compartment of the door panel 3 is the outside of the vehicle S3. The space S2 between the door panel 3 and the door trim 4 is the inside of the door 2.

[0017] The adsorption device 100 comprises an intake section 10 which is an opening formed through the door trim 4 in the interior / exterior direction of the vehicle and which draws in gas (inside air) from the interior S1 of the vehicle, a first exhaust section 11 which is an opening formed through the door trim 4 in the interior / exterior direction of the vehicle and which exhausts gas to the interior S1 of the vehicle, and a second exhaust section 12 which is an opening formed through the door panel 3 in the interior / exterior direction of the vehicle and which exhausts gas to the outside S3 of the vehicle.

[0018] The adsorption device 100 includes a flow path 20 that connects the intake unit 10, the first exhaust unit 11, and the second exhaust unit 12 and is configured by a pipe through which gas can flow. The flow path 20 includes a first flow path 21, a second flow path 22, a third flow path 23, and a fourth flow path 24. The first flow path 21 is connected to the intake unit 10 and the adsorption unit 40. The second flow path 22 is connected to the adsorption unit 40 and the switching unit 36. The third flow path 23 is connected to the switching unit 36 ​​and the first exhaust unit 11. The fourth flow path 24 is connected to the switching unit 36 ​​and the second exhaust unit 12. In the flow path 20, the intake unit 10 side is the upstream side, and the first exhaust unit 11 and second exhaust unit 12 side are the downstream side.

[0019] The adsorption device 100 includes a humidity adjusting unit 46, a first pressure adjusting unit (pressure adjusting unit) 30, a first valve 31, a second valve 32, a third valve 33, and a first pressure detecting unit 34, which are provided in the first flow path 21. The humidity adjusting unit 46 can adjust the humidity of the gas by humidifying or dehumidifying the gas sucked from the intake unit 10 and passing through the first flow path 21. The first pressure adjusting unit 30 is a pressure pump and can adjust the air pressure of the gas by pressurizing the gas passing through the first flow path 21. The first valve 31 is a pressure adjusting valve and can adjust the pressure of the gas passing through the first flow path 21. The second valve 32 is a flow rate adjusting valve and can adjust the flow rate of the gas passing through the first flow path 21. The third valve 33 is a stop valve and can stop the flow of the gas passing through the first flow path 21. The first pressure detecting unit 34 can detect the pressure of the gas passing through the first flow path 21.

[0020] The adsorption device 100 includes an adsorption unit 40 whose upstream side is connected to the first flow path 21 and whose downstream side is connected to the second flow path 22. The adsorption unit 40 includes a cylindrical column 41, an adsorbent 42 packed inside the column 41, a heater 43 attached to the outside of the column 41 and capable of heating the column 41, a temperature detection unit 44 that detects the temperature of the adsorbent 42 (inside the column 41), and a temperature adjustment unit 45 that is connected to the temperature detection unit 44 and the heater 43 and adjusts the heating temperature of the column 41 by the heater 43.

[0021] The adsorbent 42 is, for example, a material capable of adsorbing carbon dioxide at room temperature and normal pressure (or under pressurized conditions) and desorbing carbon dioxide by reducing pressure or heating. The material of the adsorbent 42 is not particularly limited, but for example, zeolite containing silicon or aluminum and oxygen can be adopted. As the zeolite, any of aluminosilicate, aluminophosphate, and silicoaluminophosphate can be adopted. The length of the column 41 and the amount of the adsorbent 42 disposed therein are not particularly limited, but for example, when the inner diameter of the column 41 is 100 mm, the length of the column 41 may be 800 mm or less and the amount of the adsorbent 42 may be 4 kg or less, the length of the column 41 may be 600 mm or less and the amount of the adsorbent 42 may be 3 kg or less, the length of the column 41 may be 400 mm or less and the amount of the adsorbent 42 may be 2 kg or less, or the length of the column 41 may be 300 mm or less and the amount of the adsorbent 42 may be 1.5 kg or less.

[0022] The adsorption device 100 includes a second pressure detection unit 35 provided in the second flow path 22 and capable of detecting the pressure of the gas passing through the second flow path 22, a fourth valve (switching unit) 36 connected to the second flow path 22, the third flow path 23, and the fourth flow path 24, and a second pressure adjustment unit (pressure adjustment unit) 37 provided in the fourth flow path 24. The second pressure adjustment unit 37 is a pressure reducing pump (vacuum pump) and can adjust the air pressure of the gas by reducing the pressure of the gas passing through the fourth flow path 24. The fourth valve 36 can switch the gas flow path 20 between an inside-vehicle exhaust flow path through which the second flow path 22 and the third flow path 23 communicate and an outside-vehicle exhaust flow path through which the second flow path 22 and the fourth flow path 24 communicate.

[0023] 1, the automobile 1 includes an occupant detection unit (detection unit) 5 that detects the presence or absence of an occupant (whether or not an occupant has boarded the automobile 1), and a control unit 6. The detection unit 5 and the control unit 6 constitute a part of the suction device 100.

[0024] Next, the electrical configuration of the adsorption device 100 will be described with reference to Fig. 3. The control unit 6 is electrically connected to the first valve 31, the second valve 32, the third valve 33, the fourth valve 36, the temperature detection unit 44, the temperature adjustment unit 45, the humidity adjustment unit 46, the first pressure adjustment unit 30, the first pressure detection unit 34, the second pressure detection unit 35, the second pressure adjustment unit 37, and the occupant detection unit 5.

[0025] Next, the flow of control of each part by the control unit 6 will be described with reference to Fig. 4 etc. When the power source (main power source) of the vehicle is turned ON (S10), the control unit 6 starts the first operation (S20 to S70). In the first operation, the control unit 6 closes the first valve 31, the second valve 32, and the third valve 33 (S20), and switches the fourth valve 36 so that the gas flow path 20 becomes an interior exhaust flow path extending from the second flow path 22 to the third flow path 23 (S30).

[0026] Next, the control unit 6 turns on the humidity adjustment unit 46 and the first pressure adjustment unit 30 to adjust the humidity and pressure of the gas passing through the first flow path 21 (S40). Next, the control unit 6 opens the first valve 31, the second valve 32, and the third valve 33 (S50). As a result, the control unit 6 passes the gas in the vehicle interior S1 sucked in from the intake unit 10 through the first flow path 21 to the inside of the adsorption unit 40 (the adsorbent 42 disposed inside the column 41), and passes the gas through the second flow path 22 and the third flow path 23 to exhaust the gas from the first exhaust unit 11 to the vehicle interior S1.

[0027] Next, the control unit 6 adjusts the humidity, pressure, flow rate, and flow velocity of the gas passing through the inside of the adsorption unit 40 (S60). Specifically, the control unit 6 adjusts the humidity adjustment unit 46 so that the relative humidity inside the adsorption unit 40 becomes a predetermined value. Such a value of the relative humidity may be 20% or more and 90% or less, 40% or more and 80% or less, or 50% or more and 70% or less. The control unit 6 also pressurizes the first pressure adjustment unit 30 (or the first pressure adjustment unit 30 and the first valve 31) so that the pressure inside the adsorption unit 40 becomes a predetermined value. Such a pressure may be 1 atmosphere or more, 1.5 atmospheres or more, 2 atmospheres or more, or 3 atmospheres or more. The control unit 6 also adjusts one or more of the first pressure adjustment unit 30, the first valve 31, and the second valve 32 so that the flow rate and flow velocity (linear velocity) inside the adsorption unit 40 become predetermined values. Such a flow rate may be 5 L / min to 50 L / min, 8 L / min to 40 L / min, 10 L / min to 30 L / min, 12 L / min to 20 L / min, or 13 L / min to 15 L / min. Also, such a flow velocity may be 1 cm / s to 8 cm / s, 1.5 cm / s to 4 cm / s, or 2 cm / s to 2.5 cm / s.

[0028] Next, the control unit 6 judges whether or not a predetermined first time (e.g., two hours) has elapsed since starting S60 (since executing the first operation) (S70). If the first time has elapsed (YES in S70), the control unit 6 proceeds to S80 and executes the second operation (S80 to S120). On the other hand, if the first time has not elapsed (NO in S70), the control unit 6 repeats the judgment of S70.

[0029] Next, the control unit 6 turns off the humidity adjustment unit 46 and the first pressure adjustment unit 30 (S90) and closes the third valve 33 (S90). Next, the control unit 6 switches the fourth valve 36 so that the gas flow path 20 becomes an outside-vehicle exhaust flow path from the second flow path 22 to the fourth flow path 24 (S100), and turns on the temperature adjustment unit 45 and the second pressure adjustment unit 37 (S110). When the temperature adjustment unit 45 is turned on, it starts heating the column 41 by the heater 43 and adjusts the heating temperature. In this way, the control unit 6 switches the gas flow path 20 with the fourth valve 36 and reduces the pressure inside the adsorption unit 40 with the second pressure adjustment unit 37, so that the gas inside the adsorption unit 40 passes through the second flow path 22 and the fourth flow path 24, and is exhausted from the second exhaust unit 12 to the outside of the vehicle S3.

[0030] Next, the control unit 6 determines whether or not a predetermined second time (e.g., 30 minutes) has elapsed since starting S110 (since executing the second operation) (S120). If the second time has elapsed (YES in S120), the control unit 6 ends the series of controls, and if not (NO in S120), repeats the determination of S120. If the series of controls has ended, the control unit 6 starts the process of S20 again. In this way, the control unit 6 alternately repeats the processes of the first operation (S20 to S70) and the second operation (S80 to S120).

[0031] Next, the effects of this embodiment will be described. The adsorption device 100 shown in this embodiment includes an intake section 10 that draws in gas, a first exhaust section 11 and a second exhaust section 12 that exhaust the gas, a pressure adjustment section 37 that adjusts the pressure, an adsorption section 40 in which an adsorbent 42 capable of adsorbing carbon dioxide and desorbing carbon dioxide by reducing the pressure is disposed, a switching section 36 that switches the gas flow path 20, and a control section 6. The control section 6 executes a first operation in which the gas drawn in from the intake section 10 is passed through the inside of the adsorption section 40 and exhausted from the first exhaust section 11, and a second operation in which the gas flow path 20 is switched by the switching section 36 and the inside of the adsorption section 40 is reduced in pressure by the pressure adjustment section 37, thereby exhausting the gas inside the adsorption section 40 from the second exhaust section 12.

[0032] According to such an adsorption device 100, in the first operation, the adsorbent 42 disposed inside the adsorption unit 40 adsorbs carbon dioxide contained in the gas sucked from the intake unit 10, and the gas with a reduced carbon dioxide concentration can be exhausted from the first exhaust unit 11. In addition, in the second operation, the carbon dioxide is desorbed from the adsorbent 42, and the gas containing the desorbed carbon dioxide can be exhausted from the second exhaust unit 12. In this way, by switching the flow path 20 by the switching unit 36 ​​and adjusting the pressure by the pressure adjustment unit 37, and repeatedly executing the first operation and the second operation, it becomes possible to repeatedly adsorb and desorb carbon dioxide for one adsorption unit 40. This makes it possible to reduce the number of adsorption units 40, and to provide an adsorption device 100 that can be miniaturized.

[0033] In the first operation, the control unit 6 causes the pressure adjustment unit 30 to pressurize the inside of the adsorption unit 40 to 2 atmospheres or more.

[0034] Such an adsorption device 100 can improve the amount of carbon dioxide adsorbed by the adsorbent 42. This makes it possible to efficiently adsorb carbon dioxide and reduce the amount of the adsorbent 42, thereby providing an adsorption device 100 that can be made more compact. Furthermore, by reducing the amount of the adsorbent 42, it becomes possible to shorten the time required for desorption of carbon dioxide in the second operation.

[0035] The adsorption device 100 includes a humidity adjusting section 46 that adjusts humidity, and the control section 6 controls the humidity adjusting section 46 to adjust the relative humidity inside the adsorption section 40 to be 40% or more and 80% or less in the first operation.

[0036] According to such an adsorption device 100, the amount of carbon dioxide adsorbed by the adsorbent 42 can be improved. This makes it possible to efficiently adsorb carbon dioxide and reduce the amount of the adsorbent 42, thereby making it possible to provide an adsorption device 100 that can be made more compact. Furthermore, by reducing the amount of the adsorbent 42, it becomes possible to shorten the time required for desorption of carbon dioxide in the second operation. Furthermore, carbon dioxide can be adsorbed without excessively dehumidifying the gas. Therefore, there is no need to use a device that performs excessive dehumidification, and the adsorption device 100 can be prevented from becoming large.

[0037] The control unit 6 executes the first operation, and after a predetermined time has elapsed, executes the second operation.

[0038] According to such an adsorption apparatus 100, the first operation and the second operation can be efficiently performed based on time.

[0039] The adsorption device 100 is disposed in a vehicle 1, the intake section 10 intakes gas from within the vehicle cabin, the first exhaust section 11 exhausts gas into the vehicle cabin, and the second exhaust section 12 exhausts gas to the outside of the vehicle cabin.

[0040] With such an adsorption device 100, the first operation is performed to reduce the carbon dioxide concentration in the gas within the vehicle cabin, and the second operation is performed to exhaust the gas containing carbon dioxide desorbed from the adsorbent 42 to the outside of the vehicle cabin.

[0041] <Embodiment 2> Next, a second embodiment of the present disclosure will be described with reference to Fig. 5. In this embodiment, the same components as those in the above embodiment are designated by the same reference numerals, and redundant descriptions of the structure, operation, and effects will be omitted.

[0042] The adsorption device 200 includes an intake unit 10, a first exhaust unit 11, and a second exhaust unit 212. The adsorption device 200 includes a flow path 220 that connects the intake unit 10, the first exhaust unit 11, and the second exhaust unit 212. The flow path 220 includes a first flow path 221, a second flow path 222, a third flow path 223, and a fourth flow path 224. The first flow path 221 is connected to the intake unit 10 and the switching unit 236. The second flow path 222 is connected to the switching unit 236 and the adsorption unit 240. The third flow path 223 is connected to the adsorption unit 240 and the first exhaust unit 11. The fourth flow path 224 is connected to the switching unit 236 and the second exhaust unit 212.

[0043] The adsorption device 200 includes a fourth valve (switching unit) 236 connected to the first flow path 221, the second flow path 222, and the fourth flow path 224. The fourth valve 236 can switch the gas flow path 220 between an inside-vehicle exhaust flow path in which the first flow path 221 and the second flow path 222 communicate with each other, and an outside-vehicle exhaust flow path in which the first flow path 221 and the fourth flow path 224 communicate with each other.

[0044] The adsorption device 200 includes a pressure adjustment unit 230, a second valve 32, a third valve 33, and a first pressure detection unit 34, which are provided in the second flow path 221. The pressure adjustment unit 230 is a pressure increase / decrease pump, and can adjust the pressure of the gas passing through the second flow path 222 to increase or decrease the pressure.

[0045] The adsorption device 200 includes an adsorption section 40, the upstream side of which is connected to the second flow path 222 and the downstream side of which is connected to the third flow path 223, and a fifth valve 238 provided in the middle of the third flow path 223. The fifth valve 238 is a stop valve and can stop the flow of gas passing through the third flow path 223. The fifth valve 238 is electrically connected to the control section.

[0046] In the first operation, the control unit switches the gas flow path 220 to the vehicle interior exhaust flow path using the fourth valve 236, opens the second valve 32, the third valve 33, and the fifth valve 238, and exhausts the gas from the vehicle interior S1 sucked in through the intake section 10 through the first flow path 221 and the second flow path 222, passes the gas through the inside of the adsorption section 240 while pressurizing it using the pressure adjustment section 230, and passes the gas through the third flow path 223 from the first exhaust section 11 to the vehicle interior S1.

[0047] In addition, in the second operation, the control unit switches the gas flow path 220 to the outside-vehicle exhaust flow path using the fourth valve 236, closes the fifth valve 238, reduces the pressure inside the adsorption unit 240 using the pressure adjustment unit 230, and exhausts the gas inside the adsorption unit 240 from the second exhaust unit 212 to the outside S3 of the vehicle by passing it through the second flow path 222 and the fourth flow path 224. EXAMPLES

[0048] The present technology will be described in detail below based on examples, but the present technology is not limited to these examples.

[0049] <Example 1> The adsorption device was placed in a laboratory (not installed in a car), and otherwise had the same configuration as in the above-mentioned embodiment 1. In the laboratory, air with a carbon dioxide concentration (initial concentration of carbon dioxide) of 1000 ppm was taken in from the intake section, a first operation was performed, and the carbon dioxide concentration of the air discharged from the first exhaust section was measured. Thereafter, a second operation was performed, and the gas containing carbon dioxide desorbed from the adsorbent was exhausted from the second exhaust section to the outside of the laboratory.

[0050] As the adsorbent, 200 g of zeolite 13X (pellet-shaped, 1.5 mm in diameter) was prepared and packed into the column. Before use, this adsorbent was pretreated by decompressing overnight at 300 degrees. The column used had a column diameter of 40 mm and a column length of 300 mm.

[0051] The humidity control unit and pressure control unit were adjusted so that the air passing through the column had a relative humidity of 40% and a flow rate of 40 L / min. The column pressure (air pressure inside the adsorption unit) was 0.21 MPa and the linear velocity was 6.38 cm / s. The flow rate divided by the mass of the adsorbent (space velocity) was 200 L / (min kg). The Reynolds number of the packed bed (Re * ) was 18.5.

[0052] Immediately after the first operation is started, the carbon dioxide concentration of the air exhausted from the first exhaust section is almost 0 ppm, but as time passes from the start of the first operation, the carbon dioxide cannot be completely adsorbed by the adsorbent, and the carbon dioxide concentration of the air exhausted from the first exhaust section rises. The time (breakthrough time) from the start of the first operation until the carbon dioxide concentration of the air exhausted from the first exhaust section reaches 100 ppm (one-tenth of the initial concentration) was measured, and it was 44.7 minutes. The above results are shown in Figure 6.

[0053] <Examples 2 to 4> Examples 2 to 4 were prepared in the same manner as Example 1, except that the flow rates of the air passing through the column were changed to 20 L / min, 13.3 L / min, and 10 L / min, respectively. The results are shown in Figure 6. Note that the column pressure, linear velocity, space velocity, and packed bed Reynolds number changed with the change in flow rate.

[0054] In Figure 6, K F is the overall mass transfer coefficient, which is a value calculated using the following equations 1 to 3.

number

number

number

[0055] <Example 5> Example 5 was prepared in the same manner as Example 2, except that the column was changed to one with a column diameter of 60 mm and a column length of 135 mm. The results are shown in Figure 6. Note that the column pressure, linear velocity, space velocity, and packed bed Reynolds number changed with the change in the column.

[0056] <Examples 6 to 8 and Comparative Examples 1 and 2> Examples 6 to 8 and Comparative Examples 1 and 2 were prepared in the same manner as Example 3, except that the column pressure and relative humidity of the air passing through the column were changed. The humidity control unit and pressure control unit were adjusted so that the column pressure and relative humidity were 0.12 MPa·40% in Example 6, 0.20 MPa·80% in Example 7, 0.21 MPa·40% in Example 8, 0.13 MPa·19% in Comparative Example 1, and 0.20 MPa·19% in Comparative Example 2. The results are shown in FIG. 6. The linear velocity, space velocity, and packed bed Reynolds number changed with the change in column pressure and relative humidity.

[0057] <Results of Examples 1 to 8 and Comparative Examples 1 and 2> According to Examples 1 to 4, the smaller the column pressure, flow rate, linear velocity, spatial velocity, or packed bed Reynolds number, the longer the breakthrough time. In Example 4, the column diameter is smaller, the column length is longer, and the flow rate is half that of Example 5, but the breakthrough time is more than twice as long. According to Examples 6 and 8, the higher the column pressure, the longer the breakthrough time. Also, according to Examples 7 and 8, the lower the relative humidity, the longer the breakthrough time. According to Examples 2 to 4 and 6 to 8, the overall mass transfer coefficient increases as the linear velocity increases. In Examples 3, 4, 6 to 8, the breakthrough time was 1 hour or more, and in Examples 4, 7, and 8, the breakthrough time was 2 hours or more. According to Example 7, if the column pressure is 0.2 MPa or more, the breakthrough time is 2 hours or more even if the relative humidity is 80%.

[0058] If the relative humidity is 19% as in Comparative Example 1, the breakthrough time can be 2 hours or more even if the column pressure is 0.13 MPa. However, in this case, it is necessary to make the gas excessively dry by the humidity adjustment unit, and there is a concern that the humidity adjustment unit will become larger and more expensive due to its high functionality and high output. On the other hand, if the conditions are as in Examples 7 and 8, even if the relative humidity is 40% or more and 80% or less (without being excessively dry), a breakthrough time equal to or longer than that of Comparative Example 1 can be achieved. In Comparative Example 2, when the relative humidity is 19% and the column pressure is 0.2, the breakthrough time is 4 hours or more.

[0059] <Other embodiments> The present disclosure is not limited to the embodiments described above and in the drawings, and for example, the following embodiments are also included within the technical scope of the present disclosure. Furthermore, in addition to the embodiments described below, various modifications can be made without departing from the spirit of the present disclosure.

[0060] (1) In addition to the above embodiment, the control unit 6 may execute the first operation when the main power supply of the vehicle 1 is ON, and execute the second operation using the secondary power supply when the main power supply of the vehicle 1 is OFF. With such an adsorption device, when the occupant uses the vehicle, the first operation is executed, and the carbon dioxide concentration of the gas in the vehicle cabin can be reduced. Also, when the occupant does not use the vehicle, the second operation is executed, and the gas containing the carbon dioxide desorbed from the adsorbent can be exhausted to the outside of the vehicle cabin. This allows the first operation and the second operation to be executed efficiently based on the usage status of the vehicle.

[0061] (2) In addition to the above embodiment, the control unit 6 may execute the first operation when the detection unit 5 detects an occupant, and execute the second operation when the detection unit 5 does not detect an occupant. With such an adsorption device, when an occupant gets into the vehicle, the first operation is executed to reduce the carbon dioxide concentration of the gas in the vehicle cabin. Also, when an occupant does not get into the vehicle, the second operation is executed to exhaust the gas containing the carbon dioxide desorbed from the adsorbent to the outside of the vehicle cabin. This allows the first operation and the second operation to be executed efficiently based on the riding status of the occupant.

[0062] (3) The adsorption device exemplified in the above embodiment may be disposed between various vehicle interior materials and a body panel (sheet metal). For example, the adsorption device may be disposed between a roof trim and a roof panel, between a floor surface and a floor panel, or between an inner wall of a trunk room and a body panel. In this case, an intake section and a first exhaust section may be disposed in the vehicle interior material, and a second exhaust section may be disposed in the body panel. The adsorption device may also be disposed in a duct of an air conditioner. In this case, in the air conditioner, an intake section and a first exhaust section may be disposed in an intake duct leading to the inside of the room, and a second exhaust section may be disposed in an exhaust duct leading to the outside of the room.

[0063] (4) The adsorption device exemplified in the above embodiment is not limited to that for automobiles (vehicles) and may be provided in various vehicles. For example, the adsorption device may be applied to vehicles such as trains and recreational vehicles as ground vehicles, airplanes and helicopters as flying vehicles, and ships and submarines as marine and underwater vehicles. In addition, such an adsorption device may be a device that draws in and adsorbs carbon dioxide in an inner space of a structure having an inner space, such as a laboratory, a factory, a building such as a house, a storage facility, a glove box, etc., and exhausts it to the inner space or the outer space. [Explanation of symbols]

[0064] 1... automobile (vehicle), 5... occupant detection section (detection section), 6... control section, 10... intake section, 11... first exhaust section, 12, 212... second exhaust section, 20, 220... flow path, 30... first pressure adjustment section (pressure adjustment section), 36, 236... fourth valve (switching section), 37... second pressure adjustment section (pressure adjustment section), 230... pressure adjustment section, 40, 240... adsorption section, 42... adsorbent, 45... temperature adjustment section, 46... humidity adjustment section, 100, 200... vehicle adsorption device (adsorption device)

Claims

1. An intake section that draws in gas; a first exhaust section and a second exhaust section for exhausting gas; A pressure adjusting unit that adjusts the pressure; an adsorption section having an adsorbent disposed therein capable of adsorbing carbon dioxide and desorbing the carbon dioxide by reducing pressure; A switching unit for switching a gas flow path; A control unit, The control unit is a first operation in which the gas sucked through the intake section is passed through the inside of the adsorption section and exhausted through the first exhaust section; a second operation in which the gas flow path is switched by the switching unit and the inside of the adsorption unit is depressurized by the pressure adjustment unit, thereby discharging the gas inside the adsorption unit from the second exhaust unit.

2. The adsorption apparatus according to claim 1 , wherein the control unit, in the first operation, pressurizes the inside of the adsorption unit with the pressure adjustment unit so that the inside of the adsorption unit is at 2 atmospheres or more.

3. Equipped with a humidity control unit that adjusts humidity, The adsorption device according to claim 1 or 2, wherein the control unit controls the humidity adjustment unit to adjust the relative humidity inside the adsorption unit to be 40% or more and 80% or less in the first operation.

4. The adsorption device according to claim 1 , wherein the control unit executes the first operation and, after a predetermined time has elapsed, executes the second operation.

5. The adsorption device is disposed in a vehicle, The intake section draws in gas from within the vehicle cabin, The first exhaust section exhausts gas into a vehicle cabin, The adsorption device according to claim 1 or 2, wherein the second exhaust section exhausts gas to an outside of a vehicle cabin.

6. The control unit is When the power supply of the vehicle is ON, the first operation is performed; The adsorption device according to claim 5 , wherein the second operation is performed when the power source of the vehicle is OFF.

7. The vehicle includes a detection unit for detecting the presence or absence of an occupant, The control unit is When the detection unit detects an occupant, the first operation is performed. The suction device according to claim 5 , wherein the second operation is executed when the detection unit does not detect an occupant.

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