Carbon dioxide adsorption method and device for poor ventilation environment

Abstract

The invention relates to the technical field of carbon dioxide adsorption, and discloses a carbon dioxide adsorption method and device for a poor ventilation environment, and the method comprises the following steps: S1, absorbing and capturing carbon dioxide in air through an adsorbent until the adsorbent is saturated, and executing S2; s2, purging the adsorbent through the air after capturing the carbon dioxide in the S1, vacuumizing the environment where the adsorbent is located, heating the adsorbent to desorb and regenerate the adsorbent, and then executing the S1. According to the method, the protected adsorbent is simultaneously subjected to purging, heating and vacuumizing treatment, so that the regeneration effect of the adsorbent can be improved, carbon dioxide can be better captured in the subsequent adsorption process, the concentration of carbon dioxide in a poor ventilation environment is effectively reduced, and the service life of the adsorbent is prolonged. And the comfort and safety of a human body in a poor ventilation environment are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of carbon dioxide adsorption, and in particular to a method and device for adsorbing carbon dioxide in poorly ventilated environments. Background Art

[0002] In poorly ventilated environments, such as inside vehicles, ship cabins, civil air defense projects, tunnels, mines, storage rooms, etc., in order to ensure operational safety, it is usually necessary to control the carbon dioxide concentration in the environment.

[0003] At present, there are four main methods for capturing carbon dioxide: cryogenic method, membrane separation method, chemical absorption method, and pressure swing adsorption method.

[0004] The cryogenic method uses the different boiling points between carbon dioxide and other components to separate them. It requires extremely low temperatures, high energy consumption, large equipment footprint, and limited application scenarios.

[0005] The membrane separation method uses the different permeation rates of different gas molecules through the separation membrane under pressure to achieve separation. However, the separation efficiency is too low to effectively purify carbon dioxide.

[0006] The chemical absorption method uses a chemical reaction between an absorbent and carbon dioxide to achieve gas separation, which can effectively remove carbon dioxide. However, its absorbent is corrosive to the equipment, and the purified gas has a strong pungent odor, which limits its application scenarios.

[0007] The pressure swing adsorption method uses the different adsorption amounts of carbon dioxide by the adsorbent under different pressures to achieve separation. It is mainly used to capture medium and low concentrations of carbon dioxide (5%-90%), and cannot yet achieve efficient capture of carbon dioxide in the air. However, the concentration of carbon dioxide in the air is extremely low, only 420ppm. Capturing carbon dioxide simply through pressure swing adsorption requires extremely high energy consumption, a complex process, and incomplete capture of carbon dioxide, which cannot meet the carbon dioxide capture requirements in poorly ventilated spaces. Summary of the invention

[0008] The purpose of the present invention is to provide a method and device for adsorbing carbon dioxide in a poorly ventilated environment, so as to effectively reduce the concentration of carbon dioxide in the poorly ventilated environment and ensure the comfort and safety of the human body in the poorly ventilated environment.

[0009] In order to achieve the above object, the present invention provides a method for adsorbing carbon dioxide in a poorly ventilated environment, comprising the following steps:

[0010] S1: absorbing carbon dioxide in the air through an adsorbent until the adsorbent is saturated, and executing S2;

[0011] S2: the adsorbent is purged with the air after the carbon dioxide is captured in S1, the environment where the adsorbent is located is evacuated, and the adsorbent is heated at the same time to desorb and regenerate the adsorbent, and then S1 is executed.

[0012] In some embodiments of the present invention:

[0013] In S2, the air after the carbon dioxide is captured in S1 is first heated, and then the adsorbent is purged and heat exchange is performed on the adsorbent at the same time, so that the adsorbent is heated.

[0014] In some embodiments of the present invention:

[0015] The adsorbent is filled in an adsorption tower, and two adsorption towers are provided, and the two adsorption towers are respectively recorded as a first adsorption tower and a second adsorption tower;

[0016] When the first adsorption tower performs S1, the second adsorption tower performs S2;

[0017] When the first adsorption tower executes S2, the second adsorption tower executes S1.

[0018] In some embodiments of the present invention:

[0019] In step S1, specifically:

[0020] S1 a: increasing the air pressure of the environment in which the adsorbent is located;

[0021] S1 b: capturing carbon dioxide from the air by absorbing it through an adsorbent until the adsorbent is saturated;

[0022] S1 c: reducing the gas pressure of the environment in which the adsorbent is located by pressure equalization operation;

[0023] S1 d: execute S2;

[0024] In step S2, specifically:

[0025] S2a: The adsorbent is purged with the air after the carbon dioxide is captured in S1 b, the environment of the adsorbent is evacuated, and the adsorbent is heated to desorb and regenerate the adsorbent;

[0026] S2b: cooling the adsorbent;

[0027] S2c: increasing the gas pressure of the environment in which the adsorbent is located by pressure equalization operation;

[0028] S2d: Raising the air pressure of the environment in which the adsorbent is located by capturing the carbon dioxide;

[0029] S2e: Execute S1.

[0030] In some embodiments of the present invention:

[0031] The adsorbent is filled in an adsorption tower, and the adsorption tower is provided in three pieces, which are respectively recorded as a first adsorption tower, a second adsorption tower and a third adsorption tower;

[0032] The first adsorption tower performs S1a, the second adsorption tower performs S1c, and the third adsorption tower performs S2c;

[0033] The first adsorption tower executes S1 b, the second adsorption tower executes S2 a, and the third adsorption tower is in a waiting state;

[0034] The first adsorption tower performs S1 b, the second adsorption tower performs S2 b, and the third adsorption tower performs S1 a;

[0035] The first adsorption tower performs S1c, the second adsorption tower performs S2c, and the third adsorption tower performs S2c;

[0036] The first adsorption tower executes S2a, the second adsorption tower is in a waiting state, and the third adsorption tower executes S1b;

[0037] The first adsorption tower performs S2b, the second adsorption tower performs S2d, and the third adsorption tower performs S1 b;

[0038] The first adsorption tower performs S2c, the second adsorption tower performs S1a, and the third adsorption tower performs S1c;

[0039] The first adsorption tower is in a waiting state, the second adsorption tower executes S1 b, and the third adsorption tower executes S2a;

[0040] The first adsorption tower performs S2d, the second adsorption tower performs S1b, and the third adsorption tower performs S2b.

[0041] In some embodiments of the present invention:

[0042] The adsorbent includes one or more of zeolite molecular sieve, activated carbon, carbon molecular sieve, alumina, silica gel or metal organic framework.

[0043] In some embodiments of the present invention:

[0044] In S2, the heating temperature of the adsorbent ranges from 0 to 500°C.

[0045] In some embodiments of the present invention:

[0046] The pressure range of the environment in which the adsorbent in S2 is located is 0-1 bar.

[0047] The present invention also provides a device for the carbon dioxide adsorption method in a poorly ventilated environment, comprising:

[0048] a first adsorption tower, the interior of which is filled with an adsorbent, and a first air inlet pipeline and a first air outlet pipeline are arranged on the first adsorption tower;

[0049] a second adsorption tower, the interior of which is filled with the adsorbent, and a second air inlet pipeline and a second air outlet pipeline are arranged on the second adsorption tower;

[0050] a fan connected to the first air intake pipeline and the second air intake pipeline;

[0051] A vacuum device, which is provided with a first air extraction pipeline and a second air extraction pipeline, wherein the first air extraction pipeline is also connected to the first air intake pipeline, and the second air extraction pipeline is also connected to the second air intake pipeline;

[0052] a first purge pipeline, the first purge pipeline being connected to the first gas outlet pipeline and the second gas outlet pipeline;

[0053] A heating device is arranged on the first adsorption tower and the second adsorption tower.

[0054] In some embodiments of the present invention, the device for the carbon dioxide adsorption method in a poorly ventilated environment further comprises:

[0055] A third adsorption tower, the interior of which is filled with the adsorbent, a third air inlet pipeline and a third air outlet pipeline are arranged on the third adsorption tower, the fan is connected to the third air inlet pipeline, the vacuum device is further provided with a third air extraction pipeline, and the third air extraction pipeline is also connected to the third air inlet pipeline;

[0056] a second purge pipeline, which is connected to the first gas outlet pipeline and the third gas outlet pipeline;

[0057] a third purge pipeline, which is connected to the second gas outlet pipeline and the third gas outlet pipeline;

[0058] The heating device is also arranged on the third adsorption tower.

[0059] The present invention provides a method and device for adsorbing carbon dioxide in a poorly ventilated environment. Compared with the prior art, the present invention has the following beneficial effects:

[0060] The present invention discloses a method for adsorbing carbon dioxide in a poorly ventilated environment. By simultaneously purging, heating and vacuuming the protected adsorbent, the regeneration effect of the adsorbent can be improved, so that carbon dioxide can be better captured in the subsequent adsorption process, thereby effectively reducing the concentration of carbon dioxide in the poorly ventilated environment and ensuring the comfort and safety of the human body in the poorly ventilated environment.

[0061] The device of the carbon dioxide adsorption method for a poorly ventilated environment of the present invention can effectively reduce the concentration of carbon dioxide in the poorly ventilated environment, and ensure the comfort and safety of the human body in the poorly ventilated environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of a device with two adsorption towers for a carbon dioxide adsorption method in a poorly ventilated environment according to an embodiment of the present invention.

[0063] Figure 2 The diagram is a schematic diagram of a device with three adsorption towers for a method for adsorbing carbon dioxide in a poorly ventilated environment according to an embodiment of the present invention.

[0064] In the figure, 1, the first adsorption tower; 2, the second adsorption tower; 3, the first air inlet pipeline; 4, the second air inlet pipeline; 5, the first air outlet pipeline; 6, the second air outlet pipeline; 7, the fan; 8, the vacuum device; 9, the first exhaust pipeline; 10, the second exhaust pipeline; 11, the first purge pipeline; 12, the heating device; 13, the detector; 14, the first air inlet valve; 15, the second air inlet valve; 16, the first air outlet valve; 17, the second air outlet valve; 18, the first air extraction valve; 19, the second air extraction valve; 20, the first purge valve; 21, the third adsorption tower; 22, the third air inlet pipeline; 23, the third air outlet pipeline; 24, the third air extraction pipeline; 25, the second purge pipeline; 26, the third purge pipeline; 27, the third air inlet valve; 28, the third air outlet valve; 29, the third air extraction valve; 30, the second purge valve; 31, the third purge valve. DETAILED DESCRIPTION

[0065] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0066] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0069] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] A method for adsorbing carbon dioxide in a poorly ventilated environment according to an embodiment of the present invention comprises the following steps:

[0071] S1: The carbon dioxide in the air is captured by the adsorbent until the adsorbent is saturated, and then S2 is executed. The pressure range of the environment where the adsorbent is located is 1-100 bar.

[0072] S2: The adsorbent is purged with air after the carbon dioxide is captured in S1, the environment in which the adsorbent is located is evacuated, and the adsorbent is heated at the same time to desorb and regenerate the adsorbent, and then S1 is executed.

[0073] In other words, step S1 is an adsorption step, and step S2 is a desorption step.

[0074] In S1, after the air passes through the adsorbent to absorb carbon dioxide, the concentration of carbon dioxide in the air decreases, thereby reducing the concentration of carbon dioxide in the poorly ventilated environment.

[0075] In S2, the saturated adsorbent releases the adsorbed carbon dioxide, and the carbon dioxide can be discharged outside the poorly ventilated environment to ensure that the concentration of carbon dioxide in the poorly ventilated environment can be reduced. At the same time, the adsorbent is regenerated to prepare for the re-execution of S1 to adsorb carbon dioxide.

[0076] Vacuum treatment means that the pressure of the environment in which the adsorbent is located is in the range of 0-1 bar.

[0077] The heating temperature range of the adsorbent is 0-500°C.

[0078] In the prior art, since the concentration of carbon dioxide in the air is very low, only 420 ppm, the adsorbent requires extremely high energy consumption to achieve the desorption process, but the desorption effect is also poor and the degree of regeneration of the adsorbent is low. Therefore, the adsorbent in the prior art is almost ineffective after being used once and cannot meet the requirements of carbon dioxide concentration in poorly ventilated environments.

[0079] In the present embodiment, during the desorption process, the adsorbent is heated, vacuumed and purged simultaneously, so that the saturated adsorbent can release more carbon dioxide. The regeneration degree of the adsorbent is high, so that the adsorbent can be reused. The regenerated adsorbent can adsorb carbon dioxide in the air again, thereby effectively reducing the concentration of carbon dioxide in poorly ventilated environments and ensuring the comfort and safety of the human body in poorly ventilated environments.

[0080] In some embodiments, in S2, the air after capturing carbon dioxide in S1 is first heated, and then the adsorbent is purged and heat exchanged on the adsorbent at the same time, so that the adsorbent is heated.

[0081] After the purge air is heated, it contacts with the adsorbent and heat exchange occurs, so that the adsorbent is not only heated but also purged.

[0082] In some embodiments, the adsorbent is filled in an adsorption tower, and two adsorption towers are provided, and the two adsorption towers are respectively recorded as a first adsorption tower 1 and a second adsorption tower 2;

[0083] When the first adsorption tower 1 executes S1, the second adsorption tower 2 executes S2;

[0084] When the first adsorption tower 1 executes S2, the second adsorption tower 2 executes S1.

[0085] In the case of setting up two adsorption towers, the first adsorption tower 1 and the second adsorption tower 2 perform the adsorption step and the desorption step in turn, thereby improving the purification efficiency of carbon dioxide in a poorly ventilated environment.

[0086] Specifically, in step S1, it is as follows:

[0087] S1 a: Increasing the gas pressure of the environment in which the adsorbent is located is the pressurization step, which can be performed by using the raw gas to reach the pressure required for the adsorption step.

[0088] S1 b: The carbon dioxide in the air is captured by the adsorbent until the adsorbent is saturated, which is the adsorption step. After the air passes through the adsorbent to absorb carbon dioxide, the concentration of carbon dioxide in the air decreases, thereby reducing the concentration of carbon dioxide in the poorly ventilated environment.

[0089] S1 c: The pressure of the environment in which the adsorbent is located is reduced by equalizing the pressure, which is the equalizing pressure drop step, so that the pressure is balanced and the pressure difference in the desorption process becomes smaller.

[0090] S1 d: Execute S2.

[0091] In step S2, specifically:

[0092] S2a: The adsorbent is purged with air after the carbon dioxide is captured in S1 b, the environment in which the adsorbent is located is vacuumed, and the adsorbent is heated to desorb and regenerate the adsorbent; that is, the analysis step, the saturated adsorbent releases the adsorbed carbon dioxide, and the carbon dioxide can be discharged outside the poorly ventilated environment to ensure that the concentration of carbon dioxide in the poorly ventilated environment can be reduced, and the adsorbent is regenerated at the same time to prepare for the adsorption of carbon dioxide again.

[0093] S2b: Cooling the adsorbent, i.e. the cooling step, leaving the tower to cool down in preparation for the next adsorption.

[0094] S2c: The pressure of the environment in which the adsorbent is located is increased by equalizing the pressure, which is the equalizing pressure step. The equalizing pressure gas is received for pressure increase to reduce the energy consumption of the charging process.

[0095] S2d: The air pressure of the adsorbent environment is increased by capturing carbon dioxide, which is the light component pressurization step. The adsorbed gas is pressurized to reduce the energy consumption of pressurization.

[0096] S2e: Execute S1.

[0097] By setting the above-mentioned pressurizing step, equalizing pressure increasing step, equalizing pressure decreasing step, cooling step, light component pressurizing step, etc., the tower can be gradually pressurized and cooled and coupled with the operations of other towers to achieve reduced energy consumption and improved purity.

[0098] A waiting state for the adsorbent may be inserted between adjacent steps.

[0099] In some embodiments, the adsorbent is filled in an adsorption tower, and three adsorption towers are provided, and the three adsorption towers are respectively recorded as a first adsorption tower 1, a second adsorption tower 2, and a third adsorption tower;

[0100] (1) The first adsorption tower 1 performs S1 a, the second adsorption tower 2 performs S1 c, and the third adsorption tower performs S2 c;

[0101] (2) The first adsorption tower 1 executes S1 b, the second adsorption tower 2 executes S2 a, and the third adsorption tower is in a waiting state;

[0102] (3) The first adsorption tower 1 performs S1 b, the second adsorption tower 2 performs S2 b, and the third adsorption tower performs S1 a;

[0103] (4) The first adsorption tower 1 performs S1c, the second adsorption tower 2 performs S2c, and the third adsorption tower performs S2c;

[0104] (5) The first adsorption tower 1 executes S2a, the second adsorption tower 2 is in a waiting state, and the third adsorption tower executes S1b;

[0105] (6) The first adsorption tower 1 performs S2b, the second adsorption tower 2 performs S2d, and the third adsorption tower performs S1b;

[0106] (7) The first adsorption tower 1 performs S2c, the second adsorption tower 2 performs S1a, and the third adsorption tower performs S1c;

[0107] (8) The first adsorption tower 1 is in a waiting state, the second adsorption tower 2 is in S1 b, and the third adsorption tower is in S2 a;

[0108] (9) The first adsorption tower 1 performs S2d, the second adsorption tower 2 performs S1b, and the third adsorption tower performs S2b.

[0109] The adsorbent includes one or more of zeolite molecular sieve, activated carbon, carbon molecular sieve, alumina, silica gel or metal organic framework (MOF). These adsorbents have a high adsorption capacity of carbon dioxide to ensure the adsorption effect of carbon dioxide in the air.

[0110] This embodiment also provides a device for applying the above-mentioned carbon dioxide adsorption method for poorly ventilated environments, comprising: a first adsorption tower 1, a second adsorption tower 2, a fan 7, a vacuum device 8, a first purge pipeline 11 and a heating device 12, please refer to Figure 1 , showing an apparatus having two adsorption towers.

[0111] The first adsorption tower 1 is filled with an adsorbent, and a first air inlet pipeline 3 and a first air outlet pipeline 5 are provided on the first adsorption tower 1. In step S1, air in a poorly ventilated environment enters the first adsorption tower 1 from the first air inlet pipeline 3, and after carbon dioxide is adsorbed by the adsorbent inside the first adsorption tower 1, the air leaves the first adsorption tower 1 from the first air outlet pipeline 5 and returns to the poorly ventilated environment.

[0112] The second adsorption tower 2 is filled with an adsorbent, and a second air inlet pipeline 4 and a second air outlet pipeline 6 are provided on the second adsorption tower 2. In step S1, air in a poorly ventilated environment enters the first adsorption tower 1 from the first air inlet pipeline 3, and after carbon dioxide is adsorbed by the adsorbent inside the first adsorption tower 1, the air leaves the first adsorption tower 1 from the first air outlet pipeline 5 and returns to the poorly ventilated environment.

[0113] The adsorption operation of the first adsorption tower 1 and the second adsorption tower 2 is performed alternately. When the first adsorption tower 1 is performing the adsorption operation, the second adsorption tower 2 is performing the decomposition operation. When the second adsorption tower 2 is performing the adsorption operation, the first adsorption tower 1 is performing the decomposition operation.

[0114] The fan 7 is connected to the first air intake pipeline 3 and the second air intake pipeline 4. The fan 7 provides kinetic energy for the air in the first air intake pipeline 3 and the second air intake pipeline 4.

[0115] The vacuum device 8 is provided with a first air extraction pipeline 9 and a second air extraction pipeline 10, the first air extraction pipeline 9 is also connected to the first air intake pipeline 3, and the second air extraction pipeline 10 is also connected to the second air intake pipeline 4. The vacuum device 8 can allow the air in the first adsorption tower 1 to enter the first air extraction pipeline 9 from the first air intake pipeline 3 and then flow out of the poorly ventilated environment, and the air in the second adsorption tower 2 can also enter the second air extraction pipeline 10 from the second air intake pipeline 4 and then flow out of the poorly ventilated environment.

[0116] The first purge pipeline 11 is connected to the first gas outlet pipeline 5 and the second gas outlet pipeline 6. In S2, when the first adsorption tower 1 performs an adsorption operation, a part of the air after the first adsorption tower 1 absorbs carbon dioxide enters the first purge pipeline 11 from the first gas outlet pipeline 5, and then enters the second adsorption tower 2 from the first purge pipeline 11 for purging. When the second adsorption tower 2 performs an adsorption operation, a part of the air after the second adsorption tower 2 absorbs carbon dioxide enters the first purge pipeline 11 from the second gas outlet pipeline 6, and then enters the first adsorption tower 1 from the first purge pipeline 11 for purging.

[0117] The heating device 12 is disposed on the first adsorption tower 1 and the second adsorption tower 2. The heating device 12 is used to heat the adsorbent inside the first adsorption tower 1 and the second adsorption tower 2, respectively.

[0118] The heating device 12 can be an electric heating wire embedded in the adsorbent of the first adsorption tower 1 and the second adsorption tower 2, or it can be heated in the form of an electric heating sleeve, or in the form of gas heating. In a specific implementation, one or more can be selected as needed according to actual needs.

[0119] By setting up two adsorption towers to perform adsorption and desorption operations respectively, the concentration of carbon dioxide in a poorly ventilated environment can be continuously reduced, ensuring the comfort and safety of the human body in a poorly ventilated environment.

[0120] A first air intake valve 14 is provided on the first air intake pipeline 3, and a second air intake valve 15 is provided on the second air intake pipeline 4; a first air outlet valve 16 is provided on the first air outlet pipeline 5, and a second air outlet valve 17 is provided on the second air outlet pipeline 6; a first air exhaust valve 18 is provided on the first air extraction pipeline 9, and a second air exhaust valve 19 is provided on the second air extraction pipeline 10; a first purge valve 20 is provided on the first purge pipeline 11.

[0121] Each valve can control the opening and closing of the pipeline in which it is located, thereby controlling the flow direction of the gas.

[0122] The device for the carbon dioxide adsorption method in a poorly ventilated environment also includes a controller, which is electrically connected to the first air inlet valve 14, the second air inlet valve 15, the first air outlet valve 16, the second air outlet valve 17, the first air extraction valve 18, the second air extraction valve 19, the first purge valve 20, the fan 7, the vacuum device 8 and the heating device 12. The controller can be a PLC system or a single chip microcomputer, which is used to control whether the first air inlet valve 14, the second air inlet valve 15, the first air outlet valve 16, the second air outlet valve 17, the first air extraction valve 18, the second air extraction valve 19, the first purge valve 20, the fan 7, the vacuum device 8 and the heating device 12 are working or in working mode.

[0123] The device of the carbon dioxide adsorption method for poorly ventilated environment also includes a detector 13, which is connected to the first air inlet pipeline 3, the second air inlet pipeline 4, the first air outlet pipeline 5 and the second air outlet pipeline 6. The detector 13 is used to detect the concentration of carbon dioxide. The setting of the detector 13 can monitor the concentration of carbon dioxide in the gas in real time.

[0124] For a device with three adsorption towers, please refer to Figure 2 Compared with the device with two adsorption towers, the device with three adsorption towers also includes a third adsorption tower 21, a second purge pipeline 25, and a third purge pipeline 26.

[0125] The third adsorption tower 21 is filled with adsorbent, and a third air inlet pipeline 22 and a third air outlet pipeline 23 are arranged on the third adsorption tower 21 . The fan 7 is connected to the third air inlet pipeline 22 . The vacuum device 8 is also provided with a third air exhaust pipeline 24 , and the third air exhaust pipeline 24 is also connected to the third air inlet pipeline 22 .

[0126] The third air intake pipeline 22 is provided with a third air intake valve 27 , the third air outlet pipeline 23 is provided with a third air outlet valve 28 , and the third air extraction pipeline 24 is provided with a third air extraction valve 29 .

[0127] The second purge pipeline 25 is connected to the first gas outlet pipeline 5 and the third gas outlet pipeline 23. A second purge valve 30 is disposed on the second purge pipeline 25.

[0128] The third purge pipeline 26 is connected to the second gas outlet pipeline 6 and the third gas outlet pipeline 23. The third gas outlet pipeline 23 is provided with a third purge valve 31.

[0129] The heating device 12 is also disposed on the third adsorption tower 21 .

[0130] Similarly, the controller is electrically connected to the third air inlet valve 27, the third air outlet valve 28, the third air extraction valve 29, the second purge valve 30 and the third purge valve 31 to control whether to work or the working mode.

[0131] The first adsorption tower 1 is filled with an adsorbent, and the first adsorption tower 1 is provided with a first air inlet pipeline 3, a first air outlet pipeline 5, a first purge pipeline 11, and a second purge pipeline 25. In step S1 a, air from a poorly ventilated environment enters the first adsorption tower 1 from the first air inlet pipeline 3 to increase the tower pressure; in step S1 b, air from a poorly ventilated environment enters the first adsorption tower 1 from the first air inlet pipeline 3, and after carbon dioxide is adsorbed by the adsorbent inside the first adsorption tower 1, it leaves the first adsorption tower 1 from the first air outlet pipeline 5 and returns to the poorly ventilated environment, and another part of the gas enters other towers from the first purge pipeline 11 and the second purge pipeline 25; in step S1 c, the gas in the tower is pressure-equalized by the first purge pipeline 11 for the first adsorption tower 1 and the second adsorption tower 2, so that the first adsorption tower 1 is depressurized; in step S2a, the vacuum device 8 allows the air in the first adsorption tower 1 to enter the first exhaust pipeline 9 from the first air inlet pipeline 3, and then flow to the outside of the poorly ventilated environment. At the same time, the heating device 12 heats the tower, and the raw gas after adsorbing carbon dioxide enters the first adsorption tower 1 through the second purge pipeline 25 for purging; in step S2b, the adsorption tower is not connected to anything and is cooled; in step S2c, the raw gas after adsorbing carbon dioxide enters the first adsorption tower 1 through the second purge pipeline 25 and is pressurized; in the waiting state, the first adsorption tower 1 is not connected to any pipeline, waiting for other towers to complete their respective steps; in step S2d, the raw gas after adsorbing carbon dioxide enters the first adsorption tower 1 through the second purge pipeline 25, so that the tower pressure is increased.

[0132] The second adsorption tower 2 is filled with adsorbent, and the second adsorption tower 2 is provided with a second air inlet pipeline 4, a second air outlet pipeline 6, a first purge pipeline 11 and a third purge pipeline 26. In step S1 a, the gas in the tower is pressurized equally on the second adsorption tower 2 and the third adsorption tower 21 by the third purge pipeline 26, and the pressure of the second adsorption tower 2 decreases; in step S1 b, the vacuum device 8 allows the air in the second adsorption tower 2 to enter the second exhaust pipeline 10 from the second air inlet pipeline 4, and then flow out of the poorly ventilated environment, and at the same time the heating device 12 heats the tower, and the raw gas after adsorbing carbon dioxide enters the second adsorption tower 2 from the first purge pipeline 11 for purging, and then the second adsorption tower 2 is not connected to anything and is cooled; in step S1 In step c, the raw gas after the adsorption of carbon dioxide enters the second adsorption tower 2 through the first purge pipeline 11 to increase its pressure; in step S2a, the second adsorption tower 2 is not connected to any pipeline, waiting for other towers to complete their respective steps; in step S2b, the raw gas after the adsorption of carbon dioxide enters the second adsorption tower 2 through the third purge pipeline 26 to increase the tower pressure; in step S2c, the air in the poorly ventilated environment enters the second adsorption tower 2 from the second air inlet pipeline 4 to increase the tower pressure; in step S2d, the air in the poorly ventilated environment enters the second adsorption tower 2 from the second air inlet pipeline 4, and after the carbon dioxide is adsorbed by the adsorbent inside the second adsorption tower 2, it leaves the second adsorption tower 2 from the second outlet pipeline 6 and returns to the poorly ventilated environment, and some gas enters the other two towers from the first purge pipeline 11 and the third purge pipeline 26.

[0133] The third adsorption tower 21 is filled with adsorbent, and a third air inlet pipeline 22 , a third air outlet pipeline 23 , a second purge pipeline 25 and a third purge pipeline 26 are arranged on the third adsorption tower 21 . In step S1a, the raw gas after carbon dioxide adsorption enters the third adsorption tower 21 through the third purge pipeline 26 to increase its pressure; in step S1b, the third adsorption tower 21 is not connected to any pipeline, waiting for other towers to complete their respective steps, and then the gas after carbon dioxide adsorption enters the third adsorption tower 21 through the second purge pipeline 25 to pressurize the tower; in step S1c, air in a poorly ventilated environment enters the third adsorption tower 21 from the third air inlet pipeline 22 to increase the tower pressure; in steps S2a and S2b, air in a poorly ventilated environment enters the third adsorption tower 21 from the third air inlet pipeline 22, and after carbon dioxide is adsorbed by the adsorbent inside the third adsorption tower 21, it leaves the third adsorption tower 21 from the third outlet pipeline 23 and returns to the poorly ventilated environment, and part of the gas enters the other two towers from the second purge pipeline 25 and the third purge pipeline 26. In step S2c, the gas in the tower is pressure-equalized for the first adsorption tower 1 and the third adsorption tower 21 by the third purge pipeline 26, and the pressure of the third adsorption tower 21 drops; in the waiting state, the vacuum device 8 can allow the air in the third adsorption tower 21 to enter the third exhaust pipeline 24 from the third adsorption tower 21, and then flow to the outside of the poorly ventilated environment, and at the same time the heating device 12 heats the tower, and the raw gas after adsorbing carbon dioxide enters the third adsorption tower 21 through the second purge pressure-equalizing pipeline for purging; in step S2d, the third adsorption tower 21 is not connected to others and is left to cool.

[0134] The fan 7 is connected to the first air intake pipeline 3, the second air intake pipeline 4 and the third air intake pipeline 22. The fan 7 provides kinetic energy for the air in the first air intake pipeline 3, the second air intake pipeline 4 and the third air intake pipeline 22.

[0135] The vacuum device 8 is provided with a first air extraction pipeline 9, a second air extraction pipeline 10 and a third air extraction pipeline 24. The first air extraction pipeline 9 is also connected to the first air intake pipeline 3, the second air extraction pipeline 10 is also connected to the second air intake pipeline 4, and the third air extraction pipeline 24 is also connected to the third air intake pipeline 22. The vacuum device 8 can allow the air in the first adsorption tower 1 to enter the first air extraction pipeline 9 from the first air intake pipeline 3 and then flow out of the poorly ventilated environment; the air in the second adsorption tower 2 can also enter the second air extraction pipeline 10 from the second air intake pipeline 4 and then flow out of the poorly ventilated environment; the air in the third adsorption tower 21 can also enter the third air extraction pipeline 24 from the third air intake pipeline 22 and then flow out of the poorly ventilated environment.

[0136] The first purge pipeline 11, the second purge pipeline 25, and the third purge pipeline 26 are connected to the first gas outlet pipeline 5, the second gas outlet pipeline 6, and the third gas outlet pipeline 23, respectively. In S1 b, when the first adsorption tower 1 is performing an adsorption operation, a part of the air after the first adsorption tower 1 absorbs carbon dioxide enters the first purge pipeline 11 and the second purge pipeline 25 from the first gas outlet pipeline 5, enters the second adsorption tower 2 for purging, and enters the third purge pipeline 26 for pressure increase. When the second adsorption tower 2 is performing an adsorption operation, a part of the air after the second adsorption tower 2 absorbs carbon dioxide enters the first purge pipeline 11 and the third purge pipeline 26 from the second gas outlet pipeline 6, enters the third adsorption tower 21 for purging, and enters the first adsorption tower 1 for pressure increase. When the third adsorption tower 21 is performing the adsorption operation, part of the air after the third adsorption tower 21 absorbs carbon dioxide enters the second purge pipeline 25 and the third purge pipeline 26 from the third gas outlet pipeline 23, enters the first adsorption tower 1 for purging, and enters the second adsorption tower 2 for pressurization.

[0137] The heating device 12 is disposed on the first adsorption tower 1, the second adsorption tower 2 and the third adsorption tower 21. The heating device 12 is used to heat the adsorbent inside the first adsorption tower 1, the second adsorption tower 2 and the third adsorption tower 21 respectively.

[0138] By setting up three adsorption towers to perform adsorption and desorption operations respectively, the concentration of carbon dioxide in a poorly ventilated environment can be continuously reduced, ensuring the comfort and safety of the human body in a poorly ventilated environment.

[0139] Embodiment 1

[0140] Specifically, the device for the carbon dioxide adsorption method in a poorly ventilated environment can be operated as follows for the arrangement of two adsorption towers:

[0141] The first adsorption tower 1 performs adsorption operation, and the second adsorption tower 2 performs desorption operation.

[0142] The first air inlet valve 14, the first air outlet valve 16 and the first purge valve 20 are opened, the fan 7 is started, and the air in the poorly ventilated environment enters the first adsorption tower 1 through the first air inlet pipeline 3, and carbon dioxide is adsorbed by the adsorbent in the first adsorption tower 1 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the first air outlet pipeline 5, and another part of the low-concentration carbon dioxide product gas enters the second adsorption tower 2 through the first purge pipeline 11 for purging. At the same time, the second exhaust valve 19 is opened, and the vacuum device 8 performs a vacuum operation on the second adsorption tower 2. At the same time, the heating device 12 is turned on to heat the adsorbent in the second adsorption tower 2 to 200°C. The carbon dioxide released by the desorption operation of the second adsorption tower 2 is discharged to the outside of the poorly ventilated environment through the second exhaust pipeline 10.

[0143] The first adsorption tower 1 performs a desorption operation, and the second adsorption tower 2 performs an adsorption operation.

[0144] The second air inlet valve 15, the second air outlet valve 17 and the first purge valve 20 are opened, the fan 7 is started, and the air in the poorly ventilated environment enters the second adsorption tower 2 through the second air inlet pipeline 4, and carbon dioxide is adsorbed by the adsorbent in the second adsorption tower 2 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the second air outlet pipeline 6, and another part of the low-concentration carbon dioxide product gas enters the first adsorption tower 1 through the first purge pipeline 11 for purging. At the same time, the first exhaust valve 18 is opened, and the vacuum device 8 performs a vacuum operation on the first adsorption tower 1. At the same time, the heating device 12 is turned on to heat the adsorbent in the first adsorption tower 1 to 200°C. The carbon dioxide released by the desorption operation of the first adsorption tower 1 is discharged to the outside of the poorly ventilated environment through the first exhaust pipeline 9.

[0145] The first adsorption tower 1 and the second adsorption tower 2 are circulated in this way, so as to continuously reduce the concentration of carbon dioxide in a poorly ventilated environment, and can reduce the concentration of carbon dioxide in the air from the original 420 ppm to below 20 ppm.

[0146] Embodiment 2

[0147] Different from the first embodiment, the gas in the first purge pipeline 11 is heated first, and the gas in the first purge pipeline 11 enters the first adsorption tower 1 or the second adsorption tower 2 and then undergoes heat exchange to raise the temperature of the first adsorption tower 1 or the second adsorption tower 2 to 100°C.

[0148] In this embodiment, the concentration of carbon dioxide in the air can be reduced from the original 420 ppm to below 50 ppm.

[0149] If only the environment in which the adsorbent is located is vacuumed during the desorption process, the adsorbent regeneration effect will be poor, and the carbon dioxide concentration in the air can only be reduced from the original 420ppm to 400ppm, and the low concentration of carbon dioxide in the air in the closed space cannot be effectively captured.

[0150] Embodiment 3

[0151] Different from the first and second embodiments, this embodiment uses a three-tower device and refines the process, and can obtain a lower carbon dioxide concentration than the first embodiment under the same operation. The following operations can be performed during use:

[0152] The first adsorption tower 1 is used to increase the pressure of the raw gas, and the second adsorption tower 2 and the third adsorption tower 21 are used to equalize the pressure.

[0153] The first air inlet valve 14 is opened, and the fan 7 is started. The air in the poorly ventilated environment enters the first adsorption tower 1 through the first air inlet pipeline 3, so that the pressure of the first adsorption tower 1 is increased. The third purge valve 31 is opened, and the gas after adsorbing carbon dioxide enters the third adsorption tower 21 from the second adsorption tower 2 through the third purge pipeline 26 to balance the pressure of the two towers.

[0154] The first adsorption tower 1 performs an adsorption operation, the second adsorption tower 2 performs a desorption operation, and the third adsorption tower 21 waits.

[0155] The first air inlet valve 14, the first air outlet valve 16, the first purge valve 20 and the second air extraction valve 19 are opened, and the fan 7 is operated. The air in the poorly ventilated environment enters the first adsorption tower 1 through the first air inlet pipeline 3, and carbon dioxide is adsorbed by the adsorbent in the first adsorption tower 1 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the first air outlet pipeline 5, and another part of the low-concentration carbon dioxide product gas enters the second adsorption tower 2 through the first purge pipeline 11 for purging. At the same time, the second air extraction valve 19 is opened, and the vacuum device 8 performs a vacuum operation on the second adsorption tower 2. At the same time, the heating device 12 is opened to heat the adsorbent in the second adsorption tower 2 to 200°C. The carbon dioxide released by the desorption operation of the second adsorption tower 2 is discharged to the outside of the poorly ventilated environment through the second air extraction pipeline 10.

[0156] The first adsorption tower 1 performs an adsorption operation, the second adsorption tower 2 performs a cooling operation, and the third adsorption tower 21 performs a light component pressure increase.

[0157] The first air inlet valve 14, the first air outlet valve 16, and the second purge valve 30 are opened, and the fan 7 is operated. The air in the poorly ventilated environment enters the first adsorption tower 1 through the first air inlet pipeline 3, and the carbon dioxide is adsorbed by the adsorbent in the first adsorption tower 1 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the first air outlet pipeline 5, and another part of the low-concentration carbon dioxide product gas enters the third adsorption tower 21 through the second purge pipeline 25 to increase the pressure of the light component, thereby increasing the pressure of the third adsorption tower 21. At the same time, the second adsorption tower 2 is cooled.

[0158] The first adsorption tower 1 and the second adsorption tower 2 perform pressure equalization operation, and the third adsorption tower 21 performs pressure charging operation.

[0159] The third air inlet valve 27 is opened, and the fan 7 is started. The air in the poorly ventilated environment enters the third adsorption tower 21 through the third air inlet pipeline 22, so that the pressure of the third adsorption tower 21 is increased. The first purge valve 20 is opened, and the air after carbon dioxide adsorption enters the second adsorption tower 2 from the first adsorption tower 1 through the first purge pipeline 11 to balance the pressure of the two towers.

[0160] The first adsorption tower 1 performs a purging operation, the second adsorption tower 2 waits, and the third adsorption tower 21 performs an adsorption operation.

[0161] The third air inlet valve 27, the third air outlet valve 28, the second purge valve 30 and the first air extraction valve 18 are opened, and the fan 7 is operated. The air in the poorly ventilated environment enters the third adsorption tower 21 through the third air inlet pipeline 22, and carbon dioxide is adsorbed by the adsorbent in the third adsorption tower 21 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the third air outlet pipeline 23, and another part of the low-concentration carbon dioxide product gas enters the first adsorption tower 1 through the second purge pipeline 25 for purging. At the same time, the first air extraction valve 18 is opened, and the vacuum device 8 performs a vacuum operation on the first adsorption tower 1. At the same time, the heating device 12 is opened to heat the adsorbent in the first adsorption tower 1 to 200°C. The carbon dioxide released by the desorption operation of the third adsorption tower 21 is discharged to the outside of the poorly ventilated environment through the second air extraction pipeline 10.

[0162] The first adsorption tower 1 performs a cooling operation, the second adsorption tower 2 performs a light component pressure increase, and the third adsorption tower 21 performs an adsorption operation.

[0163] The third air inlet valve 27, the third air outlet valve 28, and the third purge valve 31 are opened, and the fan 7 is operated. The air in the poorly ventilated environment enters the third adsorption tower 21 through the third air inlet pipeline 22, and the carbon dioxide is adsorbed by the adsorbent in the third adsorption tower 21 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the third air outlet pipeline 23, and another part of the low-concentration carbon dioxide product gas enters the second adsorption tower 2 through the third purge pipeline 26 to increase the pressure of the light component, thereby increasing the pressure of the second adsorption tower 2. At the same time, the first adsorption tower 1 is cooled.

[0164] The first adsorption tower 1 and the third adsorption tower 21 perform pressure equalization operation, and the second adsorption tower 2 performs pressure charging operation.

[0165] The second air inlet valve 15 is opened, and the fan 7 is started. The air in the poorly ventilated environment enters the second adsorption tower 2 through the second air inlet pipeline 4, so that the second adsorption tower 2 is pressurized. The second purge valve 30 is opened, and the air after carbon dioxide adsorption enters the first adsorption tower 1 from the third adsorption tower 21 through the purge pipeline to balance the pressure of the two towers.

[0166] The first adsorption tower 1 is waiting, the second adsorption tower 2 is performing adsorption operation, and the third adsorption tower 21 is performing desorption operation.

[0167] The second air inlet valve 15, the second air outlet valve 17, the third purge valve 31 and the third exhaust valve 29 are opened, and the fan 7 is operated. The air in the poorly ventilated environment enters the second adsorption tower 2 through the second air inlet pipeline 4, and carbon dioxide is adsorbed by the adsorbent in the second adsorption tower 2 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the second air outlet pipeline 6, and another part of the low-concentration carbon dioxide product gas enters the third adsorption tower 21 through the third purge pipeline 26 for purging. At the same time, the third exhaust valve 29 is opened, and the vacuum device 8 performs a vacuum operation on the third adsorption tower 21. At the same time, the heating device 12 is turned on to heat the adsorbent in the third adsorption tower 21 to 200°C. The carbon dioxide released by the desorption operation of the third adsorption tower 21 is discharged to the outside of the poorly ventilated environment through the third exhaust pipeline 24.

[0168] The first adsorption tower 1 performs light component pressure boosting, the second adsorption tower 2 performs adsorption operation, and the third adsorption tower 21 performs cooling operation.

[0169] The second air inlet valve 15, the second air outlet valve 17, and the first purge valve 20 are opened, and the fan 7 is operated. The air in the poorly ventilated environment enters the second adsorption tower 2 through the second air inlet pipeline 4, and the carbon dioxide is adsorbed by the adsorbent in the second adsorption tower 2 to obtain a low-concentration carbon dioxide product gas. A part of the low-concentration carbon dioxide product gas returns to the poorly ventilated environment through the second air outlet pipeline 6, and another part of the low-concentration carbon dioxide product gas enters the first adsorption tower 1 through the first purge pipeline 11 to increase the pressure of the light component, thereby increasing the pressure of the first adsorption tower 1. At the same time, the third adsorption tower 21 is cooled.

[0170] The first adsorption tower 1, the second adsorption tower 2 and the third adsorption tower 21 are circulated in this way, so as to continuously reduce the concentration of carbon dioxide in the poorly ventilated environment, and can reduce the concentration of carbon dioxide in the air from the original 420 ppm to below 20 ppm.

[0171] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for adsorbing carbon dioxide in a poorly ventilated environment, characterized in that: The following steps are involved: S1: absorbing carbon dioxide in the air through an adsorbent until the adsorbent is saturated, and executing S2; S2: the adsorbent is purged with the air after the carbon dioxide is captured in S1, the environment where the adsorbent is located is evacuated, and the adsorbent is heated at the same time to desorb and regenerate the adsorbent, and then S1 is executed.

2. The carbon dioxide adsorption method for poorly ventilated environments according to claim 1, characterized in that: In S2, the air after the carbon dioxide is captured in S1 is first heated, and then the adsorbent is purged and heat exchange is performed on the adsorbent at the same time, so that the adsorbent is heated.

3. The carbon dioxide adsorption method for poorly ventilated environments according to claim 1, characterized in that: The adsorbent is filled in an adsorption tower, and two adsorption towers are provided, and the two adsorption towers are respectively recorded as a first adsorption tower and a second adsorption tower; When the first adsorption tower performs S1, the second adsorption tower performs S2; When the first adsorption tower executes S2, the second adsorption tower executes S1.

4. The carbon dioxide adsorption method for poorly ventilated environments according to claim 1, characterized in that: In step S1, specifically: S1 a: increasing the air pressure of the environment in which the adsorbent is located; S1 b: capturing carbon dioxide from the air by absorbing it through an adsorbent until the adsorbent is saturated; S1 c: reducing the gas pressure of the environment in which the adsorbent is located by pressure equalization operation; S1 d: execute S2; In step S2, specifically: S2a: The adsorbent is purged with the air after the carbon dioxide is captured in S1 b, the environment of the adsorbent is evacuated, and the adsorbent is heated to desorb and regenerate the adsorbent; S2b: cooling the adsorbent; S2c: increasing the gas pressure of the environment in which the adsorbent is located by pressure equalization operation; S2d: Raising the air pressure of the environment in which the adsorbent is located by capturing the carbon dioxide; S2e: Execute S1.

5. The method for adsorbing carbon dioxide in a poorly ventilated environment according to claim 4, characterized in that: The adsorbent is filled in an adsorption tower, and the adsorption tower is provided in three pieces, which are respectively recorded as a first adsorption tower, a second adsorption tower and a third adsorption tower; The first adsorption tower performs S1a, the second adsorption tower performs S1c, and the third adsorption tower performs S2c; The first adsorption tower executes S1 b, the second adsorption tower executes S2 a, and the third adsorption tower is in a waiting state; The first adsorption tower performs S1 b, the second adsorption tower performs S2 b, and the third adsorption tower performs S1 a; The first adsorption tower performs S1c, the second adsorption tower performs S2c, and the third adsorption tower performs S2c; The first adsorption tower executes S2a, the second adsorption tower is in a waiting state, and the third adsorption tower executes S1b; The first adsorption tower performs S2b, the second adsorption tower performs S2d, and the third adsorption tower performs S1 b; The first adsorption tower performs S2c, the second adsorption tower performs S1a, and the third adsorption tower performs S1c; The first adsorption tower is in a waiting state, the second adsorption tower executes S1 b, and the third adsorption tower executes S2a; The first adsorption tower performs S2d, the second adsorption tower performs S1b, and the third adsorption tower performs S2b.

6. The carbon dioxide adsorption method for poorly ventilated environments according to claim 1, characterized in that: The adsorbent includes one or more of zeolite molecular sieve, activated carbon, carbon molecular sieve, alumina, silica gel or metal organic framework.

7. The carbon dioxide adsorption method for poorly ventilated environments according to claim 1, characterized in that: In S2, the heating temperature of the adsorbent ranges from 0 to 500°C.

8. The carbon dioxide adsorption method for poorly ventilated environments according to claim 1, characterized in that: The pressure range of the environment in which the adsorbent in S2 is located is 0-1 bar.

9. A device using the method for adsorbing carbon dioxide in a poorly ventilated environment according to any one of claims 1 to 8, characterized in that: include: a first adsorption tower, the interior of which is filled with an adsorbent, and a first air inlet pipeline and a first air outlet pipeline are arranged on the first adsorption tower; a second adsorption tower, the interior of which is filled with the adsorbent, and a second air inlet pipeline and a second air outlet pipeline are arranged on the second adsorption tower; a fan connected to the first air intake pipeline and the second air intake pipeline; A vacuum device, which is provided with a first air extraction pipeline and a second air extraction pipeline, wherein the first air extraction pipeline is also connected to the first air intake pipeline, and the second air extraction pipeline is also connected to the second air intake pipeline; a first purge pipeline, the first purge pipeline being connected to the first gas outlet pipeline and the second gas outlet pipeline; A heating device is arranged on the first adsorption tower and the second adsorption tower.

10. The device for the carbon dioxide adsorption method in a poorly ventilated environment according to claim 9, characterized in that: Also includes: A third adsorption tower, the interior of which is filled with the adsorbent, a third air inlet pipeline and a third air outlet pipeline are arranged on the third adsorption tower, the fan is connected to the third air inlet pipeline, the vacuum device is further provided with a third air extraction pipeline, and the third air extraction pipeline is also connected to the third air inlet pipeline; a second purge pipeline, which is connected to the first gas outlet pipeline and the third gas outlet pipeline; a third purge pipeline, which is connected to the second gas outlet pipeline and the third gas outlet pipeline; The heating device is also arranged on the third adsorption tower.

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