Underground space carbon dioxide and radon gas combined adsorption and desorption system and control method

Abstract

The invention provides an underground space carbon dioxide and radon gas combined adsorption and desorption system and a control method. The system comprises a combined adsorption module, the combined adsorption module comprises an adsorption cavity provided with an inlet valve and an outlet valve, and a radon gas adsorption layer and a carbon dioxide adsorption layer are arranged in the adsorption cavity in the airflow direction; the desorption regeneration module is connected with the adsorption cavity and is used for performing regeneration treatment on the saturated radon gas adsorption layer and the carbon dioxide adsorption layer; the concentration monitoring and control module comprises a gas sensor group and a main control unit, and the gas sensor group is used for monitoring the carbon dioxide concentration and the radon gas concentration in the underground space and at the inlet and the outlet of the adsorption cavity; according to the invention, synchronous high-efficiency adsorption and low-energy-consumption desorption regeneration of carbon dioxide and radon gas can be realized, the occupied space is reduced, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of underground space development technology, specifically relating to an underground space carbon dioxide and radon gas combined adsorption and desorption system and control method. Background Technology

[0002] The development and utilization of underground space has become a core direction for urban spatial expansion, with underground transportation hubs, commercial complexes, civil defense projects, and underground utility tunnels becoming increasingly common. However, underground spaces are highly enclosed and have limited ventilation, which can easily lead to increased carbon dioxide concentrations (causing discomfort such as hypoxia, dizziness, and fatigue) and the accumulation of radon gas (a natural radioactive gas that can induce serious diseases such as lung cancer with long-term exposure), directly threatening people's health and safety.

[0003] Currently, most underground space pollutant treatment uses single-function equipment: carbon dioxide treatment mainly relies on mechanical ventilation and ordinary adsorbent adsorption, while radon treatment depends on special adsorption materials or ventilation dilution. This results in problems such as dispersed equipment, large space occupation, and low efficiency of combined treatment. A few devices that attempt combined treatment have defects such as poor selectivity of adsorption materials, complex desorption processes, high energy consumption, and inability to dynamically adjust the operating status according to pollutant concentration, making it difficult to meet the actual needs of efficient, energy-saving, and integrated pollution control in underground spaces.

[0004] Therefore, it is necessary to design an underground space carbon dioxide and radon co-adsorption and desorption system and control method to achieve simultaneous and efficient adsorption of carbon dioxide and radon, low-energy desorption and regeneration, reduce space occupation, and lower operation and maintenance costs to solve the current technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a combined adsorption and desorption system and control method for carbon dioxide and radon in underground spaces, which achieves simultaneous and efficient adsorption of carbon dioxide and radon, low-energy desorption and regeneration, reduces space occupation, and lowers operation and maintenance costs.

[0006] The technical solution of this invention is: a combined adsorption and desorption system for carbon dioxide and radon in underground space, comprising:

[0007] The combined adsorption module includes an adsorption chamber equipped with an inlet valve and an outlet valve, wherein a radon adsorption layer and a carbon dioxide adsorption layer are arranged inside the adsorption chamber along the airflow direction.

[0008] A desorption regeneration module, connected to the adsorption chamber, is used to regenerate the saturated radon adsorption layer and carbon dioxide adsorption layer. The desorption regeneration module includes a vacuum pumping unit for reducing the pressure of the adsorption chamber, a heating unit for heating the radon adsorption layer and carbon dioxide adsorption layer, and a secondary processing unit for processing the desorbed gas.

[0009] The concentration monitoring and control module includes a gas sensor group and a main control unit. The gas sensor group is used to monitor the concentrations of carbon dioxide and radon gas inside the underground space and at the inlet and outlet of the adsorption chamber. The main control unit is connected to the sensor group, the combined adsorption module, and the desorption regeneration module. The main control unit is used to control the device to switch between adsorption mode and desorption mode according to the monitored concentration.

[0010] Furthermore, the secondary treatment unit includes a condenser recovery unit, a secondary adsorption tank, and a carbon dioxide collection tank connected in sequence; the condenser recovery unit is used to remove condensate from the desorbed gas, the secondary adsorption tank is used to adsorb residual radon gas, and the carbon dioxide collection tank is used to collect carbon dioxide gas.

[0011] Furthermore, the main control unit is configured as follows:

[0012] When the concentration of carbon dioxide in the underground space is detected to be higher than the first carbon dioxide threshold or the concentration of radon gas is detected to be higher than the first radon gas threshold, the control equipment will start the adsorption mode.

[0013] When the concentrations of carbon dioxide and radon at the outlet of the adsorption chamber reach the preset percentages of the inlet concentration, the adsorption material is determined to be saturated, and the control device switches to desorption mode.

[0014] Furthermore, the main control unit controls the desorption regeneration module to execute the desorption mode, including the following steps:

[0015] The vacuum pumping unit is activated to reduce the pressure in the adsorption chamber to 0.03-0.05 MPa;

[0016] The heating unit is activated to heat the radon adsorption layer and carbon dioxide adsorption layer to 60-80°C.

[0017] Maintain constant temperature and pressure inside the adsorption chamber for desorption for 30-60 minutes.

[0018] Furthermore, the underground space carbon dioxide and radon gas combined adsorption and desorption system also includes a pretreatment module and an air intake module;

[0019] The pretreatment module is connected to the air intake module, and the air intake module is connected to the combined adsorption module;

[0020] The pretreatment module is used to remove dust and moisture from polluted gases in underground spaces;

[0021] The air intake module is used to send the gas treated by the pretreatment module into the combined adsorption module in adsorption mode.

[0022] Furthermore, the air intake module includes an air intake fan, an airflow valve, a flow rate sensor, and a distributor connected in sequence; the flow rate sensor is used to monitor the air intake flow rate in real time; the distributor is disposed inside the adsorption chamber and is used to guide and redistribute the airflow entering the adsorption chamber so that it passes evenly through the radon adsorption layer and the carbon dioxide adsorption layer.

[0023] Furthermore, the main control unit is connected to the airflow valve and the flow rate sensor, and the main control unit is configured as follows:

[0024] Based on the feedback from the flow rate sensor, the opening of the airflow valve is dynamically adjusted to maintain the intake airflow rate within a preset range.

[0025] Furthermore, both the radon adsorption layer and the carbon dioxide adsorption layer are equipped with adsorption layer temperature sensors for detecting their real-time temperature.

[0026] Furthermore, the radon adsorption layer is a modified activated carbon-zeolite composite adsorption layer, and the carbon dioxide adsorption layer is a solid amine adsorption layer.

[0027] A method for controlling the combined adsorption and desorption of carbon dioxide and radon in underground spaces, employing the adsorption and desorption system described in any of the preceding methods, includes the following steps:

[0028] Real-time monitoring of carbon dioxide and radon concentrations in target areas of underground space;

[0029] When the concentration of any pollutant exceeds its corresponding preset threshold, the adsorption mode is activated, guiding the polluted gas to flow sequentially through the radon adsorption layer and the carbon dioxide adsorption layer for purification, and the purified gas is then returned.

[0030] When the adsorbent material approaches saturation, switch to desorption mode, close the inlet valve and outlet valve, evacuate and heat the adsorption chamber, and perform desorption regeneration under the set pressure and temperature conditions.

[0031] The desorbed mixed gas is sequentially condensed to remove water, and the residual radon gas is removed by secondary adsorption. The carbon dioxide is collected or discharged in compliance with standards.

[0032] After desorption is completed, the adsorption chamber is restored to normal pressure and temperature, and automatically switches back to adsorption mode to form a continuous processing cycle.

[0033] The beneficial effects of this invention are:

[0034] (1) The present invention can achieve simultaneous and efficient adsorption and low-energy desorption and regeneration of two pollutants, carbon dioxide and radon, replacing multiple sets of single-function equipment, reducing space occupation and lowering operation and maintenance costs.

[0035] (2) The system can operate automatically according to the concentration of environmental pollutants, continuously control the concentration of carbon dioxide and radon in the underground space below the safety threshold, ensure the safety of the air environment, and the system can intelligently switch between two working modes of adsorption purification and desorption regeneration to achieve unattended operation.

[0036] (3) The system breaks away from the traditional disposable adsorption filter cartridge mode and realizes the online regeneration and reuse of the core adsorption material, which greatly reduces long-term operating costs and waste generation;

[0037] (4) Secondary treatment of desorbed gas, recovery and utilization of carbon dioxide or direct emission, avoid secondary pollution and improve resource utilization. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the principle of the underground space carbon dioxide and radon gas combined adsorption and desorption system in this invention. Detailed Implementation

[0039] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0040] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] like Figure 1As shown, a combined adsorption and desorption system for carbon dioxide and radon in underground space is disclosed, comprising: a combined adsorption module 4, including an adsorption chamber 41 with an inlet valve 42 and an outlet valve 43, wherein a radon adsorption layer 44 and a carbon dioxide adsorption layer 45 are arranged inside the adsorption chamber 41 along the airflow direction; and a desorption regeneration module 5, connected to the adsorption chamber 41, for regenerating the saturated radon adsorption layer 44 and carbon dioxide adsorption layer 45, wherein the desorption regeneration module 5 includes a vacuum pumping unit 51 for reducing the pressure in the adsorption chamber 41 and a heating unit 51. The heating unit 52 of the radon adsorption layer 44 and the carbon dioxide adsorption layer 45, and the secondary processing unit for processing the desorbed gas; the concentration monitoring and control module 1, including a gas sensor group and a main control unit, the gas sensor group is used to monitor the carbon dioxide concentration and radon concentration inside the underground space and at the inlet and outlet of the adsorption chamber, the main control unit is signal connected to the sensor group, the combined adsorption module 4, and the desorption regeneration module 5, and the main control unit is used to control the device to switch between adsorption mode and desorption mode according to the monitored concentration.

[0042] In this embodiment, the concentrations of carbon dioxide and radon in the target area of ​​the underground space are monitored in real time by a gas sensor array. When the concentration of any pollutant exceeds its corresponding preset threshold, the adsorption mode is activated, and the polluted gas is guided to flow sequentially through the radon adsorption layer 44 and the carbon dioxide adsorption layer 45 for purification. After purification, the gas is returned. When the adsorption material tends to be saturated, the mode is switched to desorption mode, the inlet valve 42 and the outlet valve 43 are closed, the adsorption chamber 41 is evacuated and heated, and desorption and regeneration are carried out under the set pressure and temperature conditions. The desorbed mixed gas is sequentially condensed to remove water, and the residual radon is removed by secondary adsorption. The carbon dioxide is collected or discharged in compliance with standards. After desorption is completed, the adsorption chamber is restored to normal pressure and temperature, and the mode is automatically switched back to adsorption mode to form a continuous processing cycle. This system enables simultaneous and efficient adsorption and low-energy desorption / regeneration of two pollutants, carbon dioxide and radon, replacing multiple single-function devices, reducing space occupation, and lowering operation and maintenance costs. The system operates fully automatically based on environmental pollutant concentrations, continuously controlling carbon dioxide and radon concentrations in underground spaces below safe thresholds to ensure air quality. Furthermore, the system can intelligently switch between adsorption purification and desorption / regeneration modes, achieving unattended operation. It eliminates the need for traditional disposable adsorption filters, enabling online regeneration and reuse of core adsorption materials, significantly reducing long-term operating costs and waste generation. Desorbed gas undergoes secondary treatment, with carbon dioxide being recycled or directly emitted, avoiding secondary pollution and improving resource utilization.

[0043] In some embodiments, the secondary processing unit includes a condenser 53, a secondary adsorption tank 54, and a carbon dioxide collection tank 56 connected in sequence to the output end of the vacuum pumping unit 51; the condenser 53 is used to remove condensate from the desorbed gas, the secondary adsorption tank 54 is used to adsorb residual radon gas, and the carbon dioxide collection tank 56 is used to collect carbon dioxide gas.

[0044] In some embodiments, the main control unit is configured to: control the device to start the adsorption mode when the carbon dioxide concentration or radon concentration in the underground space is detected to be higher than a first carbon dioxide threshold or a first radon threshold; and control the device to switch to desorption mode when the carbon dioxide concentration or radon concentration at the outlet of the adsorption chamber reaches a preset percentage of the inlet concentration. Specifically, the first carbon dioxide threshold is 1000 ppm; the first radon threshold is 200 Bq / m³. 3 The default percentage is 80%.

[0045] In the above embodiments, in adsorption mode, inlet valve 42 and outlet valve 43 are open, guiding the polluted gas to flow sequentially through radon adsorption layer 44 and carbon dioxide adsorption layer 45 for purification. After purification, the gas flows back to the underground space. In desorption mode, inlet valve 42 and outlet valve 43 are closed, vacuum pumping unit 51 evacuates adsorption chamber 41, and heating unit 52 heats radon adsorption layer 44 and carbon dioxide adsorption layer 45. Desorption and regeneration are performed under set pressure and temperature conditions, and the desorbed mixed gas is sent to secondary treatment unit for absorption. Specifically, vacuum pumping unit 51 is a vacuum pump, and heating unit 52 is a low-temperature electric heating device.

[0046] In some embodiments, the main control unit controls the desorption regeneration module 5 to perform desorption mode, including the following steps:

[0047] The vacuum pumping unit 51 is activated to reduce the pressure in the adsorption chamber 41 to 0.03-0.05 MPa;

[0048] The heating unit 52 is activated to heat the radon adsorption layer 44 and the carbon dioxide adsorption layer 45 to 60-80°C.

[0049] Maintain constant temperature and pressure inside the adsorption chamber 41 for 30-60 minutes for desorption.

[0050] Specifically, a pressure sensor 55 for monitoring the internal pressure is installed inside the adsorption chamber 41; and adsorption layer temperature sensors for detecting the real-time temperature are installed on both the radon adsorption layer 44 and the carbon dioxide adsorption layer 45.

[0051] In some embodiments, the underground space carbon dioxide and radon gas combined adsorption and desorption system further includes a pretreatment module 2 and an air intake module 3; the pretreatment module 2 is connected to the air intake module 3, and the air intake module 3 is connected to the combined adsorption module 4; the pretreatment module 2 is used to perform dust removal and dehumidification treatment on the polluted gas in the underground space; the air intake module is used to send the gas treated by the pretreatment module into the combined adsorption module in adsorption mode.

[0052] Specifically, the pretreatment module 2 is equipped with a dust removal unit 21 for removing dust from polluted gases in the underground space, and a dehumidification unit 22 for dehumidifying polluted gases in the underground space. As an example, the dust removal unit 21 is one or more combinations of a pre-filter, a medium / high efficiency filter, and an electrostatic precipitator. The dehumidification unit 22 is a surface cooler for condensation dehumidification, or a desiccant wheel for adsorption dehumidification.

[0053] In some embodiments, the air intake module 3 includes an air intake fan 31, an airflow valve 32, a flow rate sensor 33, and a distributor 34 connected in sequence; the air intake fan 31, the airflow valve 32, the flow rate sensor 33, and the distributor 34 are connected by an air duct; the flow rate sensor 33 is used to monitor the airflow velocity in real time; the distributor 34 is disposed inside the adsorption chamber 41 and is used to guide and redistribute the airflow entering the adsorption chamber 41 so that it passes evenly through the radon adsorption layer 44 and the carbon dioxide adsorption layer 45, avoiding local overload and improving the utilization rate of the adsorption material and the processing stability.

[0054] In some embodiments, the main control unit is signal-connected to the airflow valve 32 and the flow rate sensor 33, and the main control unit is configured to dynamically adjust the opening of the airflow valve 32 according to the feedback from the flow rate sensor 33 to maintain the intake airflow speed within a preset range.

[0055] Specifically, the flow rate sensor 33 monitors the intake air speed in real time. If it deviates from the preset range of 0.5-1.5 m / s, the main control unit automatically adjusts the opening of the airflow valve 32. The airflow valve is an electric airflow valve.

[0056] In some embodiments, the radon adsorption layer 44 is a modified activated carbon-zeolite composite adsorption layer, and the carbon dioxide adsorption layer 45 is a solid amine adsorption layer.

[0057] In some embodiments, a method for controlling the combined adsorption and desorption of carbon dioxide and radon in underground space is disclosed, employing the adsorption and desorption system as described in any of the above embodiments, and including the following steps:

[0058] Real-time monitoring of carbon dioxide and radon concentrations in target areas of underground space;

[0059] When the concentration of any pollutant exceeds its corresponding preset threshold, the adsorption mode is activated, guiding the polluted gas to flow sequentially through the radon adsorption layer and the carbon dioxide adsorption layer for purification, and the purified gas is then returned.

[0060] When the adsorbent material approaches saturation, switch to desorption mode, close the inlet valve and outlet valve, evacuate and heat the adsorption chamber, and perform desorption regeneration under the set pressure and temperature conditions.

[0061] The desorbed mixed gas is sequentially condensed to remove water, and the residual radon gas is removed by secondary adsorption. The carbon dioxide is collected or discharged in compliance with standards.

[0062] After desorption is completed, the adsorption chamber is restored to normal pressure and temperature, and automatically switches back to adsorption mode to form a continuous processing cycle.

[0063] The technical solution of this application will be further described below through a more specific control process.

[0064] 1. Adsorption Operation: Carbon dioxide sensors and radon detectors monitor the concentration in real time within the underground space. When the carbon dioxide concentration > 1000 ppm or the radon concentration > 200 Bq / m³, the system will detect the radon concentration. 3 At this time, the main control unit issues an instruction: the inlet valve 42 and outlet valve 43 of the adsorption chamber 41 are opened, the airflow valve 32 is adjusted to the corresponding opening degree, the pretreatment module 2 is turned on to remove dust and reduce gas humidity, and the polluted gas is guided to the honeycomb distributor 34 through the air inlet guide plate. After being split, it is evenly contacted with the radon adsorption layer 44 and the carbon dioxide adsorption layer 45. The purified gas is discharged to the underground space through the outlet guide plate 47. During the adsorption process, the adsorption layer temperature sensor 46 monitors the temperature of the radon adsorption layer 44 and the carbon dioxide adsorption layer 45 in real time, and the data is fed back to the main control unit to ensure stable operation.

[0065] 2. Desorption and Regeneration: A carbon dioxide sensor and a radon detector are installed at the outlet valve 43 to monitor the concentration of emitted gas in real time. When the concentration of emitted carbon dioxide and radon reaches 80% of the inlet concentration, the adsorption material is determined to be saturated. The main control unit starts the desorption program: the inlet valve 42 and outlet valve 43 of the adsorption chamber 41 are closed, the desorption and regeneration module 5 is sealed, the vacuum pumping unit 51 is started, and the pressure in the adsorption chamber 41 is reduced to 0.04 MPa; at the same time, the heating unit 52 is started, heating the radon adsorption layer 44 and the carbon dioxide adsorption layer 45 to 70°C. The desorption process is carried out at constant temperature and pressure for 45 minutes. The mixed gas (carbon dioxide, radon, and moisture) generated during desorption enters the condenser 53 (cooled to 8°C) to remove moisture, and then flows through the secondary adsorption tank 54 (activated carbon adsorbs residual radon). The purified carbon dioxide gas is introduced into the carbon dioxide collection tank 56 for recycling (or discharged through a compliant discharge valve). During the desorption process, the pressure sensor 55 and the flow sensor 57 provide real-time feedback data. If the parameters deviate from the preset values, the main control unit automatically adjusts the power and heating temperature of the vacuum pumping unit 51.

[0066] 3. Cyclic Switching: After desorption is completed, the vacuum pumping unit 51 stops operating, the heating unit 52 cools down to room temperature, the pressure in the adsorption chamber 41 returns to normal pressure, the desorption valve 58 closes, and the inlet valve 42 and outlet valve 43 of the adsorption chamber 41 reopen. The equipment automatically switches to the adsorption state to continue treating pollutants in the underground space. The main control unit records the running time, concentration changes, energy consumption, and other data for each adsorption and desorption cycle, and supports historical queries. If a fault occurs (such as sensor malfunction or valve jamming), the fault indicator light will illuminate and an alarm message will be sent via the wireless module.

[0067] 4. Airflow optimization: During operation, the flow rate sensor 33 monitors the intake air speed in real time. If it deviates from the preset range of 0.5-1.5m / s, the main control unit automatically adjusts the opening of the airflow valve 32 and adjusts the angle of the intake guide plate (30-60°) to ensure that the airflow flows evenly through the radon adsorption layer 44 and the carbon dioxide adsorption layer 45, avoids local overload, and improves the overall utilization rate of the adsorption material.

[0068] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0069] The embodiments described above only illustrate some implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A combined adsorption and desorption system for carbon dioxide and radon in underground space, characterized in that, include: The combined adsorption module includes an adsorption chamber equipped with an inlet valve and an outlet valve, wherein a radon adsorption layer and a carbon dioxide adsorption layer are arranged inside the adsorption chamber along the airflow direction. A desorption regeneration module, connected to the adsorption chamber, is used to regenerate the saturated radon adsorption layer and carbon dioxide adsorption layer. The desorption regeneration module includes a vacuum pumping unit for reducing the pressure of the adsorption chamber, a heating unit for heating the radon adsorption layer and carbon dioxide adsorption layer, and a secondary processing unit for processing the desorbed gas. The concentration monitoring and control module includes a gas sensor group and a main control unit. The gas sensor group is used to monitor the concentrations of carbon dioxide and radon gas inside the underground space and at the inlet and outlet of the adsorption chamber. The main control unit is connected to the sensor group, the combined adsorption module, and the desorption regeneration module. The main control unit is used to control the device to switch between adsorption mode and desorption mode according to the monitored concentration.

2. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 1, characterized in that: The secondary treatment unit includes a condenser recovery unit, a secondary adsorption tank, and a carbon dioxide collection tank connected in sequence; the condenser recovery unit is used to remove condensate from the desorbed gas, the secondary adsorption tank is used to adsorb residual radon gas, and the carbon dioxide collection tank is used to collect carbon dioxide gas.

3. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 1, characterized in that, The main control unit is configured as follows: When the concentration of carbon dioxide in the underground space is detected to be higher than the first carbon dioxide threshold or the concentration of radon gas is detected to be higher than the first radon gas threshold, the control equipment will start the adsorption mode. When the concentrations of carbon dioxide and radon at the outlet of the adsorption chamber reach the preset percentages of the inlet concentration, the adsorption material is determined to be saturated, and the control device switches to desorption mode.

4. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 1, characterized in that, The main control unit controls the desorption regeneration module to execute the desorption mode, including the following steps: The vacuum pumping unit is activated to reduce the pressure in the adsorption chamber to 0.03-0.05 MPa. The heating unit is activated to heat the radon adsorption layer and carbon dioxide adsorption layer to 60-80°C. Maintain constant temperature and pressure inside the adsorption chamber for desorption for 30-60 minutes.

5. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 1, characterized in that, It also includes a pretreatment module and an intake module; The pretreatment module is connected to the air intake module, and the air intake module is connected to the combined adsorption module; The pretreatment module is used to remove dust and moisture from polluted gases in underground spaces; The air intake module is used to send the gas treated by the pretreatment module into the combined adsorption module in adsorption mode.

6. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 5, characterized in that: The air intake module includes an air intake fan, an airflow valve, a flow rate sensor, and a distributor connected in sequence; the flow rate sensor is used to monitor the air intake speed in real time; the distributor is located inside the adsorption chamber and is used to guide and redistribute the airflow entering the adsorption chamber so that it passes evenly through the radon adsorption layer and the carbon dioxide adsorption layer.

7. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 6, characterized in that: The main control unit is connected to the airflow valve and the flow rate sensor, and the main control unit is configured as follows: Based on the feedback from the flow rate sensor, the opening of the airflow valve is dynamically adjusted to maintain the intake airflow rate within a preset range.

8. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 1, characterized in that: Both the radon adsorption layer and the carbon dioxide adsorption layer are equipped with adsorption layer temperature sensors for detecting their real-time temperature.

9. The underground space carbon dioxide and radon combined adsorption and desorption system according to claim 1, characterized in that: The radon adsorption layer is a modified activated carbon-zeolite composite adsorption layer, and the carbon dioxide adsorption layer is a solid amine adsorption layer.

10. A method for controlling the combined adsorption and desorption of carbon dioxide and radon in underground spaces, employing the adsorption and desorption system as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Real-time monitoring of carbon dioxide and radon concentrations in target areas of underground space; When the concentration of any pollutant exceeds its corresponding preset threshold, the adsorption mode is activated, guiding the polluted gas to flow sequentially through the radon adsorption layer and the carbon dioxide adsorption layer for purification, and the purified gas is then returned. When the adsorbent material approaches saturation, switch to desorption mode, close the inlet valve and outlet valve, evacuate and heat the adsorption chamber, and perform desorption regeneration under the set pressure and temperature conditions. The desorbed mixed gas is sequentially condensed to remove water, and the residual radon gas is removed by secondary adsorption. The carbon dioxide is collected or discharged in compliance with standards. After desorption is completed, the adsorption chamber is restored to normal pressure and temperature, and automatically switches back to adsorption mode to form a continuous processing cycle.

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