Integrated device for purifying vocs and catalytically treating carbon dioxide

Abstract

The application discloses a VOCs purification and carbon dioxide catalytic integrated treatment device, which comprises a heat pump unit, a moisture absorption unit connected with the heat pump unit, a physical adsorption carbon-containing substance unit connected with the moisture absorption unit or the heat pump unit, and a chemical treatment carbon-containing gas unit connected with the physical adsorption carbon-containing substance unit, wherein the heat pump unit comprises a compressor, a first heat exchanger, a second heat exchanger and a four-way valve, the first air outlet and the second air outlet of the compressor are connected with the first port and the second port of the four-way valve respectively, and the first heat exchanger and the second heat exchanger are connected with the third port and the fourth port of the four-way valve respectively. In the cold cycle, VOCs and CO2 are adsorbed; in the hot cycle, the VOCs and the CO2 are desorbed and are transported to other devices in the system for further treatment, so that the pollutants are enriched in situ.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment devices, and in particular to an integrated treatment device for VOCs purification and carbon dioxide catalyst preparation of formic acid. Background Technology

[0002] The shipbuilding industry is a comprehensive industry with important economic and strategic importance in my country. Among them, ship exhaust gas is one of the main sources of carbon pollutant emissions, characterized by large total amount, complex composition, and high proportion of fugitive emissions. The current methods for resource recovery of carbon pollutants commonly used in the industry include carbon capture and storage (CCUS), microalgae carbon fixation, catalytic oxidation, and adsorption regeneration. These methods have the following drawbacks: (1) CO2 treatment is energy-intensive, requires large equipment size, and is costly; (2) VOCs treatment is limited by catalyst poisoning, light dependence, and difficulty in adsorbent regeneration; (3) the value of the resource recovery products from the treatment process is low, resulting in poor economic efficiency.

[0003] CN222658249U discloses a mobile integrated adsorption and desorption VOCs treatment device for shipbuilding and repair, comprising: a main body, which consists of a filtration system, an adsorption system, and a desorption system. This treatment device can be moved to any location on the shipbuilding and repair site. Through the coordinated operation of the highly integrated filtration, adsorption, and desorption systems, it achieves a complete process from preliminary treatment of waste gas to deep purification, and then to the efficient regeneration and utilization of the adsorption material. The high-performance honeycomb activated carbon adsorption bed not only improves adsorption efficiency but also withstands high-intensity airflow and harsh operating conditions. It is also equipped with a thermal management and safety protection system, making the adsorption and desorption processes safer and more reliable. CN216481029U discloses a catalytic combustion device for high-humidity VOCs, comprising a fan, adsorption pipes, an activated carbon adsorption box, a catalytic combustion furnace, a desorption pipe, a dry filter box, a heat pump dehumidifier, an exhaust pipe, and a gas transmission pipe. The organic waste gas first passes through the dry filter box to remove larger particle sizes, drying the organic waste gas, and then is sent to the activated carbon adsorption box for adsorption. When the activated carbon is saturated, the adsorption operation is stopped, and the organic matter is desorbed from the activated carbon by the high-temperature gas generated in the catalytic combustion furnace, thus regenerating it.

[0004] However, existing methods for resource recovery of carbon-containing pollutants suffer from low energy efficiency, independent operation of refrigeration, dehumidification, and exhaust gas treatment systems, and failure to effectively recover and utilize low-grade energy sources such as condensation heat. Utility Model Content

[0005] This invention provides an integrated system of "cold and hot cycle - adsorption catalysis - energy regeneration". During the cold cycle, VOCs and CO2 are adsorbed; during the hot cycle, VOCs and CO2 are desorbed and transported to other equipment in the system for further processing, thereby achieving in-situ enrichment of pollutants.

[0006] Another aspect of this utility model is to provide an integrated system of "cold and hot cycle - adsorption catalysis - energy regeneration" that can treat carbon pollutants (VOCs and CO2) in the ship's cabin with low energy consumption and high efficiency.

[0007] On the one hand, an integrated VOCs purification and carbon dioxide catalytic treatment device includes:

[0008] Heat pump unit;

[0009] A moisture-absorbing unit, which is connected to the heat pump unit;

[0010] A unit that physically adsorbs carbonaceous substances is connected to a moisture-absorbing unit.

[0011] A chemical treatment unit for carbon-containing gases, which is connected to a physically adsorbed carbon-containing substance;

[0012] The heat pump unit includes a compressor, a first heat exchanger, a second heat exchanger, and a four-way valve. The first and second air inlets of the compressor are connected to the first and second ports of the four-way valve, respectively. The first and second heat exchangers are connected to the third and fourth ports of the four-way valve, respectively.

[0013] By changing the temperature of the fluid entering the moisture absorption unit and the physical adsorption unit of carbonaceous substances through the four-way valve of the heat pump unit, the effects of low-temperature adsorption and high-temperature desorption can be achieved, thereby realizing the in-situ treatment of carbonaceous pollutants. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one embodiment of the first working mode of the integrated VOCs purification and carbon dioxide catalytic treatment device of this utility model.

[0015] Figure 2 This is a schematic diagram of one embodiment of the second working mode of the integrated VOCs purification and carbon dioxide catalytic treatment device of this utility model.

[0016] Figure 3 This is a schematic diagram of the second embodiment of the first working mode of the integrated VOCs purification and carbon dioxide catalytic treatment device of this utility model.

[0017] Figure 4 This is a schematic diagram of the second embodiment of the VOCs purification and carbon dioxide catalytic integrated treatment device of this utility model in the second working mode.

[0018] Figure 5 This is a schematic diagram of the airflow structure of the second heat exchanger of this utility model.

[0019] The diagram shows the following valves: 1. Gas to be treated; 2. Treated gas; 3. Second heat exchanger; 4. First valve; 5. Second valve; 6. Third valve; 7. Fourth valve; 8. Fifth valve; 9. Throttling valve. Detailed Implementation

[0020] The integrated VOCs purification and carbon dioxide catalytic treatment device of this application is described in further detail below. This does not limit the scope of protection of this application, which is defined by the claims. Certain specific details disclosed provide a comprehensive understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments can be implemented using other materials, etc., without employing one or more of these specific details.

[0021] Unless the context otherwise requires, the terms “comprising” and “including” in the specification and claims shall be understood as open-ended and inclusive, meaning “including, but not limited to”.

[0022] The terms "implementation," "an implementation," "another implementation," or "certain implementations" used in this specification refer to specific features, structures, or characteristics described in relation to the implementation, which are included in at least one implementation. Therefore, "implementation," "an implementation," "another implementation," or "certain implementations" do not necessarily all refer to the same implementation. Furthermore, specific features, structures, or characteristics can be combined in any way within one or more implementations. Each feature disclosed in this specification can be replaced by any alternative feature that provides the same, equivalent, or similar purpose. Therefore, unless otherwise specified, the disclosed features are merely general examples of equivalent or similar features.

[0023] On the one hand, an integrated VOCs purification and carbon dioxide catalytic treatment device includes:

[0024] Heat pump unit;

[0025] A moisture-absorbing unit, which is connected to the heat pump unit;

[0026] The physical adsorption unit for carbonaceous materials is connected to the moisture absorption unit or the heat pump unit.

[0027] A chemical treatment unit for carbon-containing gases, which is connected to a physically adsorbed carbon-containing substance;

[0028] The heat pump unit includes a compressor, a first heat exchanger, a second heat exchanger, and a four-way valve. The first and second air inlets of the compressor are connected to the first and second ports of the four-way valve, respectively. The first and second heat exchangers are connected to the third and fourth ports of the four-way valve, respectively.

[0029] In one embodiment, the second heat exchanger is connected to the moisture absorption unit via a pipe.

[0030] During the refrigeration process, the first heat exchanger acts as a condenser, and the second heat exchanger acts as an evaporator. The high-temperature, high-pressure medium inside the compressor is guided to the first heat exchanger through a four-way valve, where it exchanges heat, releases heat, and condenses into a liquid state. The liquid medium then flows to the second heat exchanger, where it exchanges heat with the ambient gas (containing VOCs and CO2), absorbing heat from the surrounding air. The cooled ambient gas flows to the desiccant unit, where it can better adsorb moisture at low temperatures. The cooled gas then enters the physical adsorption unit for carbonaceous substances, adsorbing carbonaceous materials such as VOCs and CO2.

[0031] During heating operation, the four-way valve switches, with the first heat exchanger acting as an evaporator and the second heat exchanger as a condenser. This allows the high-temperature, high-pressure medium from the compressor to be guided through the four-way valve to the second heat exchanger, where it undergoes heat exchange, releases heat, and condenses into a liquid state. Gas drawn into the second heat exchanger becomes high-temperature gas. The liquid medium then flows back to the first heat exchanger, where it undergoes further heat exchange before flowing back into the compressor. The high-temperature gas exiting the second heat exchanger flows through a dehumidification unit to remove adsorbed moisture. After the water in the high-temperature gas is condensed, it enters a physical adsorption unit for carbonaceous materials, where VOCs and CO2 are desorbed. The VOCs and CO2 are then carried into a chemical treatment unit for carbonaceous gases, where they undergo a chemical reaction, converting them into environmentally friendly or easily recyclable substances.

[0032] Preferably, during the heating process, the second heat exchanger of the heat pump unit is connected to the moisture absorption unit and the physical adsorption unit for carbonaceous substances, respectively.

[0033] In this embodiment, after the high-temperature gas removes the moisture from the desiccant unit, it can be directly discharged into the environment. During the next cooling process, the gas from the environment re-enters the second heat exchanger for the same treatment.

[0034] In some embodiments, the exhaust port of the second heat exchanger of the heat pump unit is connected to both the moisture-absorbing unit and the physical adsorption carbon-containing material unit via ducts. A fourth air valve is installed in the duct between the exhaust port of the second heat exchanger and the physical adsorption carbon-containing material unit. The moisture-absorbing unit and the physical adsorption carbon-containing material unit are connected via a duct, and a fifth air valve is installed in this duct.

[0035] In some embodiments, a three-way valve is provided between the physical adsorption unit for carbonaceous materials and the chemical treatment unit for carbonaceous gases. The three-way valve allows for control of the connection between the physical adsorption unit for carbonaceous materials and the chemical treatment unit for carbonaceous gases, or between the physical adsorption unit for carbonaceous materials and the external environment.

[0036] During the refrigeration process, the unit that physically adsorbs carbonaceous materials is connected to the external environment but disconnected from the unit that chemically treats carbonaceous gases. This allows the low-temperature gas to flow through the moisture absorption unit and the unit that physically adsorbs carbonaceous materials before being discharged into the environment.

[0037] During the heating process, the physical adsorption unit for carbonaceous materials is connected to the chemical treatment unit for carbonaceous gases, while being disconnected from the external environment. This allows the high-temperature gas to desorb the VOCs and CO2 adsorbed in the physical adsorption unit and carry these gases into the chemical treatment unit for further chemical processing.

[0038] The chemical treatment unit for carbon-containing gases in this application can employ all methods disclosed in the prior art that can treat VOCs and CO2.

[0039] For example: catalytic oxidation and / or electrolysis.

[0040] The four-way valve of this application is a control valve with four oil ports commonly used in industry and is also a commonly used component in refrigeration equipment.

[0041] The moisture absorption unit of this application is a CaCl2 / graphene adsorption bed; the physical adsorption unit for carbon-containing substances is a MOF adsorption bed.

[0042] Through the continuous switching between cooling and heating processes, VOCs and carbon dioxide in the environment can be continuously processed and their content reduced, thus purifying the gas.

[0043] Generally, when the adsorption cycle of the cooling process is 2-4 hours, the resolution cycle of the heating process is 0.5-5 hours.

[0044] In some embodiments, a heat accumulator is provided on the first heat exchanger. The heat accumulator includes a heat-storing material that absorbs heat dissipated by the high-temperature medium inside the first heat exchanger.

[0045] The second heat exchanger has two air ducts connected to its air inlet. A second air valve is installed in the first air duct, and a first air valve and a third air valve are installed in the second air duct. The second air duct passes through the heat accumulator. During cooling operation, the first and third air valves in the second heat exchanger are closed, and the second air valve is open, forming the first air duct. During heating operation, the first and third air valves are open, and the second air valve is closed, forming the second air duct.

[0046] In cooling mode, ambient gas (containing VOCs and CO2) enters the second heat exchanger and exchanges heat with the low-temperature medium in the heat pump system, becoming low-temperature gas. The low-temperature gas discharged from the second heat exchanger then sequentially enters the moisture absorption unit and the physical adsorption unit for carbonaceous substances. Moisture, VOCs, and CO2 in the low-temperature gas are adsorbed in these units.

[0047] In heating mode, the flow direction of the refrigerant in the heat pump system is reversed. The ambient gas (containing VOCs and CO2) first passes through the heat accumulator, where it is heated once. The heated gas then enters the second heat exchanger to exchange heat with the high-temperature medium of the heat pump system, thereby improving the heat exchange efficiency of the second heat exchanger. The high-temperature gas discharged from the second heat exchanger enters the moisture absorption unit and the physical adsorption carbonaceous material unit, respectively, to remove the adsorbed moisture from the heated gas. The VOCs and CO2 adsorbed by the physical adsorption carbonaceous material unit are desorbed, and the desorbed VOCs and CO2 enter the resource recovery module for chemical treatment. The treated gas is then discharged into the environment. Therefore, during the heating process, the adsorption capacity of the moisture absorption unit and the physical adsorption carbonaceous material unit can be regenerated for the next adsorption cycle.

[0048] This invention utilizes the cooling and heating settings of a heat pump system to recover heat from the condenser during the cooling process. During the heating process, this recovered heat is used to improve heating efficiency, thereby increasing the regeneration efficiency of the moisture absorption unit and the physical adsorption unit containing carbonaceous materials.

[0049] This invention utilizes the alternating use of the cooling and heating processes of a heat pump system to achieve an integrated system of "cooling and heating cycle - adsorption catalysis - energy regeneration" with high efficiency, thereby reducing or removing pollutants and humidity in the environment.

[0050] Example 1

[0051] refer to Figure 1 , Figure 2 The diagram shows a processing module of an integrated VOCs purification and carbon dioxide catalytic treatment device. The device includes a heat pump unit, which comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, and a throttling valve 9. The compressor is connected to the first and second heat exchangers, the throttling valve 7, and the four-way valve via pipelines. The high-pressure, high-temperature medium, pressurized by the compressor, sequentially passes through the first and second heat exchangers, or sequentially through the second and first heat exchangers, in either cooling or heating mode. The four-way valve controls the flow direction of the high-temperature, high-pressure medium after compressor pressurization. The first and second vent ports of the compressor are connected to the first and second ports of the four-way valve, respectively. The first and second heat exchangers are connected to the third and fourth ports of the four-way valve, respectively.

[0052] In the integrated processing device of the embodiment, the exhaust port of the second heat exchanger of the heat pump unit is connected to the moisture absorption unit (specifically, the CaCl2-graphene adsorption bed) to absorb moisture; the physical adsorption unit for carbonaceous materials (specifically, the MOFs adsorption bed) is connected to the moisture absorption unit or to the exhaust port of the second heat exchanger of the heat pump unit; and the chemical treatment unit for carbonaceous gases (which can be called the resource recovery module) is connected to the physical adsorption unit for carbonaceous materials.

[0053] Specifically, the exhaust vent of the second heat exchanger of the heat pump unit is connected to both the moisture-absorbing unit (CaCl2-graphene adsorption bed) and the physical adsorption carbonaceous material unit (MOFs adsorption bed) via ducts. A fourth air valve 7 is installed in the duct between the exhaust vent of the second heat exchanger and the physical adsorption carbonaceous material unit. A fifth air valve 8 is installed in the duct connected to the moisture-absorbing unit (CaCl2-graphene adsorption bed) and the physical adsorption carbonaceous material unit (MOFs adsorption bed).

[0054] In different operating modes, the connection of the air duct is changed by opening or closing the fourth air valve 7 and the fifth air valve 8.

[0055] like Figure 1 The integrated processing device shown is in a cooling operation mode. In this mode, the fourth gas valve 7 is closed, the fifth gas valve 8 is open, the connection between the physical adsorption carbonaceous material unit (MOF adsorption bed) and the chemical treatment carbonaceous gas unit (which can be called the resource recovery module) is disconnected, and the gas adsorbed by the physical adsorption carbonaceous material unit (MOF adsorption bed) is directly discharged into the environment.

[0056] In refrigeration mode, the high-temperature, high-pressure medium from the compressor first passes through the first heat exchanger (acting as a condenser) and then flows to the second heat exchanger (acting as an evaporator). After exchanging heat with the heat pump medium in the second heat exchanger, the gas to be treated (Gas 1) becomes a low-temperature gas. This low-temperature gas then passes through a moisture absorption unit (CaCl2-graphene adsorption bed) and a physical adsorption carbonaceous material unit (MOFs adsorption bed). Moisture carried in the gas is adsorbed in the moisture absorption unit, while VOCs and CO2 are adsorbed in the physical adsorption carbonaceous material unit (MOFs adsorption bed). The gas after adsorption, i.e., the treated Gas 2, is discharged into the environment from the physical adsorption carbonaceous material unit (MOFs adsorption bed). Under low-temperature conditions, moisture, VOCs, and CO2 carried in the gas are more easily adsorbed. After operating in cooling mode for a certain period of time, the adsorption capacity of the moisture absorption unit (CaCl2-graphene adsorption bed) and the physical adsorption carbonaceous material unit (MOFs adsorption bed) approaches saturation, requiring a switch to heating mode to regenerate the adsorption activity of the moisture absorption unit (CaCl2-graphene adsorption bed) and the physical adsorption carbonaceous material unit (MOFs adsorption bed).

[0057] In heating mode, as shown in the attached... Figure 2 As shown, the fourth gas valve 7 is open and the fifth gas valve 8 is closed, connecting the physical adsorption unit for carbon-containing materials (MOFs adsorption bed) and the chemical treatment unit for carbon-containing gases (which can be called the resource recovery module).

[0058] In this operating mode, the high-pressure, high-temperature medium from the heat pump compressor first passes through the second heat exchanger (acting as a condenser) and then flows to the first heat exchanger (acting as an evaporator). The gas to be treated 1 in the environment exchanges heat with the heat pump medium in the second heat exchanger, becoming a high-temperature gas. This high-temperature gas flows to the moisture absorption unit (CaCl2-graphene adsorption bed) and the physical adsorption carbonaceous material unit (MOFs adsorption bed). The heat provided by the high-temperature gas evaporates the moisture adsorbed in the moisture absorption unit (CaCl2-graphene adsorption bed), expelling it from the unit and converting it into condensate. The heat also desorbs VOCs and CO2 adsorbed in the physical adsorption carbonaceous material unit (MOFs adsorption bed), which then enters the chemical treatment carbonaceous gas unit (which can be called the resource recovery module) for chemical treatment, converting it into environmentally harmless substances. Simultaneously, the substances adsorbed in the moisture absorption unit (CaCl2-graphene adsorption bed) and the physical adsorption carbonaceous material unit (MOFs adsorption bed) are removed, regenerating the adsorption capacity. In the next cooling mode, it can continue to adsorb moisture, VOCs, and CO2 from the gas.

[0059] Furthermore, by combining a heat pump with a CaCl2-graphene adsorption bed and a MOFs adsorption bed, it can cyclically remove moisture, VOCs, and CO2 from the environment, thus purifying the environment.

[0060] Example 2

[0061] Based on Example 1, a heat accumulator was added to the integrated VOCs purification and carbon dioxide catalytic treatment device. The heat accumulator includes erythritol heat storage material.

[0062] As attached Figure 3 and 4 As shown, the heat accumulator is in contact with the high-temperature zone inside the first heat exchanger, and heat can be transferred to the heat accumulator by heat conduction. The basic operation of this integrated processing device is the same as in Embodiment 1, with two operating modes: cooling adsorption mode and heating desorption mode.

[0063] In this embodiment, the air duct of the second heat exchanger 3 is increased, as shown in the attached figure. Figure 5 As shown, the air inlet of the second heat exchanger is connected to two air ducts. When the first air valve 4 and the third air valve 6 are closed and the second air valve 5 is open, the first air duct is formed; when the first air valve 4 and the third air valve 6 are open and the second air valve 5 is closed, the second air duct is formed.

[0064] In refrigeration mode, within the second heat exchanger 3, the gas to be processed flows along the first air duct, i.e., attached... Figure 5 The gas to be processed enters the second heat exchanger 3 from the left side, where it exchanges heat with the heat pump medium inside the second heat exchanger 3, becoming a low-temperature gas. Then, as shown in the attached... Figure 3 As shown, the material sequentially enters the moisture absorption unit (CaCl2-graphene adsorption bed) and the physical adsorption unit for carbon-containing substances (MOFs adsorption bed).

[0065] In heating mode, the gas to be processed flows along the second air duct within the second heat exchanger 3. Upon entering the second heat exchanger 3, the gas first flows to the heat accumulator, where it exchanges heat, raising its temperature. Then, the gas further exchanges heat with the high-temperature, high-pressure medium of the heat pump within the second heat exchanger 3, further increasing its temperature before exiting the second heat exchanger. Then, as shown in the attached diagram... Figure 3 As shown, the high-temperature gas flows to the moisture absorption unit (CaCl2-graphene adsorption bed) and the physical adsorption unit for carbonaceous materials (MOFs adsorption bed) for desorption. This operating mode improves the heating efficiency of the gas being treated.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the substantive technical content of the present utility model. The substantive technical content of the present utility model is broadly defined within the scope of the claims. Any technical entity or method completed by others that is completely identical to or an equivalent modification of the claims is considered to be covered within the scope of the claims.

Claims

1. An integrated VOCs purification and carbon dioxide catalytic treatment device, characterized in that, include: Heat pump unit; A moisture-absorbing unit, which is connected to the heat pump unit; A physical adsorption unit for carbonaceous materials is connected to the moisture absorption unit or to the heat pump unit; A chemical treatment unit for carbon-containing gases, which is connected to the physically adsorbed carbon-containing substance; The heat pump unit includes a compressor, a first heat exchanger, a second heat exchanger, and a four-way valve. The first and second air inlets of the compressor are connected to the first and second ports of the four-way valve, respectively. The first and second heat exchangers are connected to the third and fourth ports of the four-way valve, respectively. The exhaust port of the second heat exchanger of the heat pump unit is connected to the moisture-absorbing unit and the physical adsorption carbon-containing material unit through air ducts. A fourth air valve is installed in the air duct between the exhaust port of the second heat exchanger and the physical adsorption carbon-containing material unit. The moisture absorption unit and the physical adsorption carbonaceous material unit are connected by an air duct, in which a fifth air valve is installed.

2. The integrated VOCs purification and carbon dioxide catalytic treatment device according to claim 1, characterized in that, During the refrigeration process, the first heat exchanger acts as a condenser, and the second heat exchanger acts as an evaporator. During the heating process, the four-way valve switches, with the first heat exchanger acting as an evaporator and the second heat exchanger acting as a condenser.

3. The integrated VOCs purification and carbon dioxide catalytic treatment device according to claim 2, characterized in that, During the refrigeration process, a fourth air valve is installed in the duct between the exhaust port of the second heat exchanger and the physical adsorption carbon-containing material unit to close; a fifth air valve is installed in the duct between the moisture absorption unit and the physical adsorption carbon-containing material unit to open.

4. The integrated VOCs purification and carbon dioxide catalytic treatment device according to claim 2, characterized in that, During the heating process, a fourth air valve is installed in the duct between the exhaust port of the second heat exchanger and the physical adsorption carbon-containing material unit to open; a fifth air valve is installed in the duct between the moisture absorption unit and the physical adsorption carbon-containing material unit to close.

5. The integrated VOCs purification and carbon dioxide catalytic treatment device according to any one of claims 1-4, characterized in that, A three-way valve is provided between the physical adsorption unit for carbon-containing substances and the chemical treatment unit for carbon-containing gases. The three-way valve controls the connection between the physical adsorption unit for carbonaceous substances and the chemical treatment unit for carbonaceous gases, or the physical adsorption unit for carbonaceous substances and the external environment.

6. The integrated VOCs purification and carbon dioxide catalytic treatment device according to claim 1, characterized in that, A heat accumulator is installed on the first heat exchanger.

7. The integrated VOCs purification and carbon dioxide catalytic treatment device according to claim 6, characterized in that, The air inlet of the second heat exchanger is connected to two air ducts. A second air valve is installed in the first air duct, and a first air valve and a third air valve are installed in the second air duct. The second air duct passes through the heat accumulator.

8. The integrated VOCs purification and carbon dioxide catalytic treatment device according to claim 7, characterized in that, During the refrigeration process, the first and third air valves in the second heat exchanger are closed, and the second air valve is opened to form the first air duct. During the heating process, the first and third air valves are opened, and the second air valve is closed, forming the second air duct.

Images