Low-concentration carbon dioxide feed gas recovery device

Abstract

The utility model provides a low-concentration carbon dioxide feed gas recovery device which comprises a bottom frame, a pretreatment assembly and a control module, two groups of mounting tables are arranged on the bottom frame, the pretreatment assembly comprises a pretreatment box, the pretreatment box is detachably arranged on one group of mounting tables, and the control module is arranged on the other group of mounting tables; an assembly frame is fixedly arranged at the top end of the bottom frame, a plurality of groups of positioning mounting grooves are uniformly formed in the assembly frame, an absorption tank, an analysis tank, an adsorption tank and a drying tank are respectively arranged in the plurality of groups of positioning mounting grooves, connectors with electromagnetic valves are arranged at two ends of the absorption tank, the analysis tank, the adsorption tank and the drying tank, and the electromagnetic valves of the plurality of groups of connectors are electrically connected with a control module; a displayer is arranged on the bottom frame on one side of the assembly frame and electrically connected with the control module. The pretreatment box is provided with a layered treatment module, multiple filters, a drying agent and an impurity removal agent and can monitor temperature and humidity, and each tank body is provided with a sensor, so that impurity treatment and data monitoring are realized, and the purity of recycled gas is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of recovery device technology, and more specifically, to a low-concentration carbon dioxide feed gas recovery device. Background Technology

[0002] Low-concentration carbon dioxide feedstock contains carbon dioxide, and direct emission of it is wasteful and increases carbon emissions. Some industrial production requires carbon dioxide as a feedstock. Recovery devices can separate and collect it, enabling resource reuse and meeting production needs. Therefore, recovery devices are necessary. Through recovery devices, the originally low-concentration carbon dioxide feedstock that is easily emitted and wasted can be recovered. This not only enables resource reuse and reduces carbon emissions to the environment, but also provides a stable gas source for industrial production that requires carbon dioxide as a feedstock, such as carbonated beverage manufacturing and chemical synthesis, bringing both economic and environmental benefits.

[0003] However, the pretreatment units of traditional devices are mostly based on a "single filtration + simple dehydration" structure, lacking a layered treatment module for complex impurities. This results in impurities in the raw gas, and the residual moisture and chemical impurities in the raw gas will interfere with the adsorption / absorption process of carbon dioxide (such as moisture reducing the selectivity of the adsorbent and sulfides causing side reactions with the absorbent), leading to unstable purity of the final product, which cannot meet the requirements of industrial or food-grade applications. Utility Model Content

[0004] In view of the aforementioned problems, and in conjunction with the first aspect of this utility model, an embodiment of this utility model provides a low-concentration carbon dioxide feed gas recovery device, the method comprising:

[0005] A low-concentration carbon dioxide feed gas recovery device includes a base frame, a pretreatment component, and a control module. The base frame is provided with two sets of mounting platforms. The pretreatment component includes a pretreatment box, which is detachably mounted on one set of mounting platforms. The control module is mounted on the other set of mounting platforms.

[0006] An assembly frame is fixedly provided at the top of the base frame. Multiple sets of positioning and mounting slots are evenly provided on the assembly frame. An absorption tank, a desorption tank, an adsorption tank, and a drying tank are respectively provided in the multiple sets of positioning and mounting slots. Connectors with solenoid valves are provided at both ends of the absorption tank, the desorption tank, the adsorption tank, and the drying tank. The solenoid valves of the multiple sets of connectors are electrically connected to the control module.

[0007] A display is provided on the base frame on one side of the assembly rack, and the display is electrically connected to the control module.

[0008] According to a preferred embodiment, the pretreatment box has a hollow structure, and an air inlet pipe is provided on one side of the pretreatment box, with a first check valve fitted on the air inlet pipe; a coarse filter is provided on the inner side of the pretreatment box near the air inlet pipe, and the coarse filter has a multi-faceted baffle structure; a bag filter and a membrane filter are also sequentially provided in the pretreatment box at the top of the coarse filter.

[0009] According to a preferred embodiment, the inner side of the pretreatment box at the top of the membrane filter is provided with an assembly platform in a stepped manner. The assembly platform is provided with two sets of trays, and the two sets of trays are respectively provided with a desiccant and a purification agent.

[0010] According to a preferred embodiment, a cover is detachably provided at the top of the pretreatment box, and a rubber sealing gasket is provided between the cover and the pretreatment box; multiple sets of pipe clamps are provided at the bottom of the cover, and a heat exchange tube is coiled inside the pretreatment box, the heat exchange tube is clamped in the pipe clamps, and both ends of the heat exchange tube are embedded in the cover; a temperature and humidity sensor is also provided on the cover between the multiple sets of pipe clamps.

[0011] According to a preferred embodiment, an air pump is also provided on the mounting platform on which the pretreatment box is installed. A second check valve is provided on the air outlet pipe of the pretreatment box. The air inlet of the air pump is connected to the second check valve through a pipeline, and the air outlet of the air pump is connected to the connector at the bottom of the absorption tank through a pipeline. The temperature and humidity sensor and the air pump are both electrically connected to the control module.

[0012] According to a preferred embodiment, two sets of detection holes are provided on the outer surfaces of the absorption tank, the desorption tank, the adsorption tank, and the drying tank. A pressure sensor for monitoring the tank pressure and a component sensor for monitoring the gas composition inside the tank are respectively installed in the two sets of detection holes. The pressure sensor and the component sensor are both electrically connected to the control module.

[0013] According to a preferred embodiment, the same set of exhaust gas pipes are connected to the connectors at the top of the absorption tank, the desorption tank, the adsorption tank, and the drying tank, and an exhaust gas recovery pipe is provided at the top of the air inlet pipe of the pretreatment box, and the exhaust gas pipes and the exhaust gas recovery pipes are connected by pipelines.

[0014] According to a preferred embodiment, the connectors at the bottom of the absorption tank, the desorption tank, the adsorption tank, and the drying tank are provided with communicating vessels, and multiple sets of communicating vessels are connected sequentially.

[0015] According to a preferred embodiment, a buffer tank and a gas compressor are horizontally arranged on the base frame near the control module. The drying tank, the buffer tank, and the gas compressor are connected in sequence through pipelines, and the outlet of the gas compressor is connected to an external gas storage device.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The pretreatment chamber is equipped with a coarse filter, a bag filter, and a membrane filter. It also has a tray containing desiccant and impurity remover on the assembly table. It is equipped with heat exchange tubes and temperature and humidity sensors. It can perform multi-layer filtration, drying, impurity removal, and temperature regulation on low-concentration carbon dioxide feed gas, reducing interfering substances such as moisture, dust, and chemical impurities in the feed gas. This reduces the impurity content of the gas entering the subsequent absorption tank, desorption tank, and other tanks, improving the purity of the final recovered carbon dioxide and meeting the gas purity requirements of industrial or food-grade applications.

[0018] 2. Both ends of the absorption tank and desorption tank are equipped with solenoid valves, which are electrically connected to the control module. Temperature and humidity sensors, pressure sensors, composition sensors, and air pumps are also electrically connected to the control module, and the display can show relevant data. The control module can receive detection signals from various sensors and automatically control the solenoid valves, air pump operation, etc., to regulate the raw material gas treatment and tank operation processes, eliminating the need for frequent manual operation and improving the convenience and stability of the unit's operation.

[0019] 3. The top connectors of the absorption tank, desorption tank, adsorption tank, and drying tank are connected to the same exhaust gas pipe. The top of the inlet pipe of the pretreatment box is equipped with an exhaust gas recovery pipe. The exhaust gas pipe and the exhaust gas recovery pipe are connected by pipelines, which can centrally collect the exhaust gas generated during the operation of the device. At the same time, the device is equipped with a buffer tank and a gas compressor. The drying tank, buffer tank, and gas compressor are connected in sequence. The outlet of the compressor is connected to an external storage device, which can store the recovered carbon dioxide, realizing the separate treatment and storage of exhaust gas and recovered gas.

[0020] 4. The base frame is equipped with two sets of mounting platforms. The pretreatment components are disassembled and mounted on one set of mounting platforms, while the control module is mounted on the other set. The assembly frame has multiple sets of positioning mounting slots, in which the absorption tank, desorption tank, and other tanks are respectively positioned. The top of the pretreatment box is detachably fitted with a box cover. This structure facilitates the disassembly, installation, and maintenance of the pretreatment components, tanks, and box cover, reducing the difficulty of later maintenance of the unit. At the same time, the base frame and assembly frame provide stable support and orderly arrangement for the various components of the unit, improving the overall structural stability of the unit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first structure after assembly of this utility model.

[0022] Figure 2 This is a schematic diagram of the second structure after assembly of this utility model.

[0023] Figure 3 yes Figure 2 A magnified structural diagram of region a in the middle.

[0024] Figure 4 This is a schematic diagram of the connection structure between multiple tanks of this utility model.

[0025] Figure 5 This is a schematic diagram of the exploded structure between the pretreatment box and the air pump of this utility model.

[0026] Figure 6 This is a first cross-sectional view of the pretreatment box after assembly.

[0027] Figure 7 This is a second cross-sectional view of the pretreatment box after assembly.

[0028] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows:

[0029] 1. Base frame; 2. Control module; 3. Pretreatment box; 4. Box cover; 5. Buffer tank; 6. Gas compressor; 101. Assembly rack; 102. Connector; 103. Display; 201. First check valve; 202. Coarse filter; 203. Bag filter; 204. Membrane filter; 301. Receiving tray; 401. Sealing gasket; 402. Heat exchange tube; 403. Temperature and humidity sensor; 501. Air pump; 502. Second check valve; 601. Pressure sensor; 602. Composition sensor; 701. Exhaust gas pipe; 801. Communicating device. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings;

[0031] like Figures 1 to 7As shown, this utility model provides a low-concentration carbon dioxide feed gas recovery device, including a base frame 1, a pretreatment component, and a control module 2. The base frame 1 has two sets of mounting platforms. The pretreatment component includes a pretreatment box 3, which is detachably mounted on one set of mounting platforms. The control module 2 is mounted on the other set of mounting platforms. An assembly frame 101 is fixedly mounted at the top of the base frame 1. Multiple sets of positioning mounting slots are evenly distributed on the assembly frame 101. An absorption tank, a desorption tank, an adsorption tank, and a drying tank are respectively located in these slots. Each of the absorption tank, desorption tank, adsorption tank, and drying tank has a connector 102 with a solenoid valve at both ends. The solenoid valves of the multiple connectors 102 are electrically connected to the control module 2. A display 103 is mounted on one side of the base frame 1, and the display 103 is electrically connected to the control module 2. The base frame 1 has two sets of mounting platforms; the pretreatment box 3 is detachably mounted on one set of mounting platforms, and the control module 2 is mounted on the other set. The pretreatment box 3 and the control module 2 are installed in separate areas to avoid mutual interference during operation and ensure the stable performance of their respective functions. At the same time, the pretreatment box 3 adopts a detachable structure, so when it is necessary to inspect or replace internal components, it can be quickly removed from the mounting platform without extensive disassembly of the entire device, thus reducing the complexity of maintenance operations for the pretreatment box 3.

[0032] The assembly frame 101 provides a stable mounting platform for each tank. The positioning mounting slots can position each tank, ensuring that the absorption tank, desorption tank, adsorption tank, and drying tank are arranged in an orderly manner on the device, avoiding difficulties in pipeline connection due to tank misalignment. Furthermore, each tank is independently mounted in its positioning mounting slot, so that subsequent maintenance of a single tank will not affect the installation status of other tanks. Each end of the absorption tank, desorption tank, adsorption tank, and drying tank is equipped with a connector 102 with a solenoid valve. The solenoid valves of multiple connectors 102 are electrically connected to the control module 2. The control module 2 can send control signals to the solenoid valves of each connector 102 via electrical connection, realizing the automatic opening and closing of the solenoid valves. By controlling the opening and closing of the solenoid valves, the connection between each tank and external pipelines can be controlled, thereby regulating the gas delivery path and timing between the tanks. This eliminates the need for manual valve operation, improving the accuracy and efficiency of gas delivery control.

[0033] A display 103 is mounted on the base frame 1 on one side of the assembly rack 101, and the display 103 is electrically connected to the control module 2. During operation, the control module 2 can transmit the operating parameters of the device, such as the working status of each tank and the on / off status of the solenoid valves, to the display 103. The display 103 can present these parameters in a visual form, allowing operators to intuitively understand the overall operation of the device by observing the display 103, without having to check each component individually. This facilitates the timely detection of abnormalities in the operation of the device and provides data reference for subsequent adjustments and maintenance. The control module 2 is a computer, which can use a Modicon M580 processor.

[0034] The absorption tank contains an absorbent, allowing the low-concentration carbon dioxide feed gas to come into full contact with it. Utilizing the adsorption or chemical reaction characteristics of the absorbent on carbon dioxide, the carbon dioxide is separated and absorbed from the mixed gas, achieving initial enrichment of carbon dioxide. The desorption tank then heats and depressurizes the enriched liquid that has absorbed carbon dioxide, promoting a reverse reaction between the carbon dioxide and the absorbent, causing the carbon dioxide to desorb from the enriched liquid, thus achieving further enrichment of carbon dioxide and regeneration and recycling of the absorbent.

[0035] The adsorption tank is filled with adsorbent to further remove residual impurities in the desorbed carbon dioxide gas, thereby improving the purity of carbon dioxide through adsorption and enabling it to meet higher purity requirements. The drying tank is filled with desiccant to remove moisture from the carbon dioxide gas, preventing moisture from freezing and corroding equipment during subsequent storage, transportation, or use, and ensuring that the dryness of the carbon dioxide meets the application standards.

[0036] like Figure 1 , Figure 6 and Figure 7 As shown, the pretreatment box 3 has a hollow structure, and an air inlet pipe is provided on one side of the pretreatment box 3. A first check valve 201 is fitted on the air inlet pipe. A coarse filter 202 is provided on the inner side of the pretreatment box 3 near the air inlet pipe. The coarse filter 202 has a multi-faceted baffle structure. A bag filter 203 and a membrane filter 204 are also provided in sequence at the top of the coarse filter 202 in the pretreatment box 3. The first check valve 201 can restrict the unidirectional flow of gas, allowing only low-concentration carbon dioxide raw material gas to enter the pretreatment box 3 from the air inlet pipe, preventing the treated gas or impurities in the pretreatment box 3 from flowing back into the air inlet pipe, avoiding contamination of the raw material gas to be treated, and ensuring the unidirectionality and cleanliness of the raw material gas treatment process. The coarse filter 202 is provided in the pretreatment box 3 near the air inlet pipe. The coarse filter 202 has a multi-faceted baffle structure. The multi-faceted baffle structure can extend the flow path of the raw gas in the coarse filter 202, increase the contact area between the gas and the filter, and enable the coarse filter 202 to more effectively intercept large particles of dust and impurities in the raw gas, thereby reducing the filtration load of subsequent filtration components.

[0037] A bag filter 203 and a membrane filter 204 are sequentially installed in the pretreatment chamber 3 at the top of the coarse filter 202. After the raw gas is initially filtered by the coarse filter 202, it enters the bag filter 203, which can further filter out smaller particulate impurities. Then the gas enters the membrane filter 204, which can intercept even finer impurities or some small molecule pollutants. Through three-stage progressive filtration, the impurity content in the raw gas is gradually reduced, and the cleanliness of the gas entering the subsequent tank is improved.

[0038] The pretreatment box 3 at the top of the membrane filter 204 has a stepped assembly platform on its inner side. The assembly platform contains two sets of trays 301, one for desiccant and one for a cleaning agent. The stepped structure creates independent spaces for each layer of the assembly platform, providing clear installation positions for the two sets of trays 301. This prevents the trays from stacking or contacting each other within the pretreatment box 3, ensuring that the substances in each tray function effectively without interference. The two sets of trays 301 contain both desiccant and a cleaning agent, respectively. After being filtered by membrane filter 204, the raw gas first comes into contact with the impurity remover in the holding tray 301, which adsorbs residual chemical impurities in the gas. Then the gas comes into contact with the desiccant in another set of holding trays 301, which absorbs moisture in the gas. Through the two-step process of impurity removal and drying, the impurity and moisture content in the raw gas is further reduced, minimizing the impact on subsequent absorption tanks, desorption tanks, and other tanks.

[0039] The holding tray 301 is installed inside the assembly table. When the desiccant or impurity remover needs to be replaced later, the holding tray 301 can be directly removed from the assembly table without disassembling other internal structures of the pretreatment box 3. This simplifies the replacement process of the desiccant and impurity remover, reduces the difficulty of maintenance operations of the pretreatment box 3, and ensures the continuous and stable operation of the device.

[0040] like Figures 5 to 7 As shown, the pretreatment chamber 3 has a detachable cover 4 at its top, with a rubber sealing gasket 401 between the cover 4 and the pretreatment chamber 3. Multiple sets of pipe clamps are located at the bottom of the cover 4, and heat exchange tubes 402 are coiled inside the pretreatment chamber 3, secured within the pipe clamps, with both ends of the heat exchange tubes 402 embedded within the cover 4. Temperature and humidity sensors 403 are also installed on the cover 4 between the multiple sets of pipe clamps. The pretreatment chamber 3 has a detachable cover 4 at its top, with a rubber sealing gasket 401 between the cover 4 and the pretreatment chamber 3. The cover 4 is detachable, facilitating the opening of the pretreatment chamber 3 for inspection and replacement of internal components. The rubber sealing gasket 401 fills the gap between the cover 4 and the pretreatment chamber 3, preventing gas leakage from the pretreatment chamber 3 and blocking external air and impurities from entering, ensuring the internal sealing of the pretreatment chamber 3.

[0041] Multiple sets of pipe clamps are provided at the bottom of the cover 4. The heat exchange tube 402 is coiled inside the pretreatment chamber 3 and secured in the pipe clamps, with both ends of the heat exchange tube 402 embedded in the cover 4. The pipe clamps can fix the coiled shape of the heat exchange tube 402, preventing displacement or deformation of the heat exchange tube 402 during gas flow. The two ends of the heat exchange tube 402 are embedded in the cover 4, and can be removed together with the cover 4 when it is disassembled, facilitating individual cleaning or replacement of the heat exchange tube 402. Temperature and humidity sensors 403 are installed on the cover 4 between the multiple sets of pipe clamps. The temperature and humidity sensors 403 can directly monitor the temperature and humidity of the gas inside the pretreatment chamber 3, obtaining the state parameters of the gas after treatment. The sensor is installed on the cover 4, which facilitates inspection or calibration of the sensor when the cover 4 is disassembled, ensuring the accuracy of the detection data. The temperature and humidity sensor 403 can be an FH-403 model sensor.

[0042] An air pump 501 is also installed on the mounting platform where the pretreatment box 3 is installed. A second check valve 502 is installed on the air outlet pipe of the pretreatment box 3. The air inlet of the air pump 501 is connected to the second check valve 502 through a pipeline, and the air outlet of the air pump 501 is connected to the connector 102 at the bottom of the absorption tank through a pipeline. The temperature and humidity sensor 403 and the air pump 501 are both electrically connected to the control module 2. The second check valve 502 on the air outlet pipe of the pretreatment box 3 prevents the gas from flowing back into the pretreatment box 3 from the air pump 501 side, avoiding the backflow of gas or impurities that have entered the subsequent pipeline into the pretreatment box 3, thus preventing contamination of the gas already treated in the pretreatment box 3 and ensuring the unidirectionality of gas delivery.

[0043] The outlet of the air pump 501 is connected to the connector 102 at the bottom of the absorption tank via a pipeline. The air pump 501 generates power to stably deliver the treated gas in the pretreatment tank 3 to the absorption tank, overcoming the flow resistance of the gas in the pipeline and connector 102, ensuring that the gas enters the absorption tank according to the process, and avoiding gas stagnation in the pretreatment tank 3 due to insufficient power. The temperature and humidity sensor 403 is electrically connected to the control module 2, and the control module 2 is electrically connected to the air pump 501. The temperature and humidity sensor 403 can transmit the monitored gas temperature and humidity data in the pretreatment tank 3 to the control module 2. After receiving the data, the control module 2 can adjust the operating parameters of the air pump 501 according to the gas temperature and humidity status, such as changing the gas delivery rate of the air pump 501, so that the gas enters the absorption tank in a suitable state to meet the subsequent processing requirements.

[0044] like Figures 1 to 4As shown, two sets of detection holes are provided on the outer surfaces of the absorption tank, desorption tank, adsorption tank, and drying tank. A pressure sensor 601 for monitoring tank pressure and a composition sensor 602 for monitoring the gas composition inside the tank are respectively installed in these two sets of detection holes. Both the pressure sensor 601 and the composition sensor 602 are electrically connected to the control module 2. The detection holes provide installation positions for the sensors, allowing the pressure sensor 601 to directly contact the tank pressure for monitoring, and the composition sensor 602 to monitor the gas composition inside the tank. This provides data support for the operating status of each tank, facilitating timely understanding of the gas processing situation. Both the pressure sensor 601 and the composition sensor 602 are electrically connected to the control module 2. The sensors transmit the monitored pressure and gas composition data to the control module 2, which analyzes this data in a timely manner to determine whether each tank is in normal operating condition. This provides a basis for subsequent control of equipment such as solenoid valves and air pumps 501 in each tank, ensuring the device operates according to the expected process.

[0045] Meanwhile, each tank is equipped with two sets of detection ports, corresponding to pressure sensor 601 and composition sensor 602 respectively, allowing the pressure and gas composition of each tank to be monitored individually. This allows for the location of tanks exhibiting abnormalities, preventing a problem in one tank from affecting the assessment of the operating status of other tanks, facilitating rapid troubleshooting and handling of problematic tanks, and reducing overall equipment downtime. The pressure sensor 601 can be an E8F2-AN04 model pressure sensor; the composition sensor 602 can be a CO2-A1 model electrochemical principle sensor.

[0046] The absorption tank, desorption tank, adsorption tank, and drying tank are connected to the same set of exhaust gas pipes 701 via connectors 102 at their tops. The pretreatment tank 3 has an exhaust gas recovery pipe at its top inlet pipe, and the exhaust gas pipes 701 and 701 are connected via pipelines. Connectors 801 are installed on the connectors 102 at the bottom of the absorption tank, desorption tank, adsorption tank, and drying tank, and multiple sets of connectors 801 are connected sequentially. Exhaust gas generated in each tank can enter the exhaust gas pipe 701 through the top connector 102, and then be guided through pipelines to the exhaust gas recovery pipe, achieving centralized collection of exhaust gas from multiple tanks and avoiding treatment difficulties caused by dispersed exhaust gas emissions. Simultaneously, the exhaust gas recovery pipe is connected to the inlet pipe of the pretreatment tank 3, allowing some recyclable exhaust gas to be returned to the pretreatment tank 3 for reprocessing. The connectors 801 provide a gas or liquid flow channel at the bottom of each tank, allowing materials (such as absorbent and regenerated liquid) to be transported between tanks according to the flow process, eliminating the need for separate transport pipelines for each tank, simplifying the device's pipeline layout, and reducing pipeline connection complexity.

[0047] The exhaust pipe 701 and the communicating vessel 801 are connected to the top and bottom of each tank, respectively, forming an independent channel for "top exhaust gas collection + bottom material conveying". The functions of the two are clearly distinguished, avoiding the mixing of exhaust gas and materials to be treated during the conveying process, ensuring the purity of the collected exhaust gas and the stability of the material conveying. At the same time, the independent channel structure makes it easy to control the conveying status of exhaust gas and materials separately.

[0048] like Figures 2 to 3 As shown, a buffer tank 5 and a gas compressor 6 are horizontally mounted on the base frame 1 near the control module 2. The drying tank, buffer tank 5, and gas compressor 6 are connected sequentially via pipelines. The outlet of the gas compressor 6 is connected to an external gas storage device. The recovered gas processed by the drying tank can directly enter the buffer tank 5 through pipelines, and then enter the gas compressor 6 from the buffer tank 5, forming an orderly gas delivery path. This ensures that the recovered gas is processed according to the "drying-buffering-compression" process, avoiding interruptions or chaos in the gas delivery process and ensuring the continuity of recovered gas processing. Both the buffer tank 5 and the gas compressor 6 are located on the base frame 1 near the control module 2. The control module 2 can more easily connect to the buffer tank 5 and the gas compressor 6 (e.g., by connecting sensors and control lines), thereby obtaining their operating parameters and adjusting the equipment status according to the parameters, reducing the length of the wiring and lowering the overall wiring complexity of the device.

[0049] A buffer tank 5 is mounted on the base frame 1, located between the drying tank and the gas compressor 6. The buffer tank 5 temporarily stores the dried recovered gas, balancing pressure or flow fluctuations that may occur when the gas exits the drying tank. This prevents unstable gas from directly entering the gas compressor 6, thus preventing sudden changes in the compressor's operating load due to fluctuations in the intake gas state and ensuring the stability of the gas compressor 6's operation. The outlet of the gas compressor 6 is connected to an external gas storage device. The gas compressor 6 compresses the recovered gas delivered by the buffer tank 5, increasing the gas pressure and making it easier to store in the external storage device. This increases the gas storage capacity per unit volume of the storage device, and the compressed gas is also more convenient for subsequent industrial use, improving the ease of utilization of the recovered gas.

[0050] It should be noted that, in order to simplify the description of this utility model and thus help in understanding one or more embodiments of the utility model, multiple features may sometimes be grouped into one embodiment, drawing or description thereof in the foregoing description of the embodiments of this utility model.

Claims

1. A low-concentration carbon dioxide feed gas recovery device, comprising a base frame (1), a pretreatment component, and a control module (2), characterized in that: The base frame (1) is provided with two sets of mounting platforms. The pretreatment component includes a pretreatment box (3). The pretreatment box (3) is detachably mounted on one set of mounting platforms, and the control module (2) is mounted on the other set of mounting platforms. An assembly frame (101) is fixedly provided at the top of the base frame (1). Multiple sets of positioning mounting slots are evenly provided on the assembly frame (101). An absorption tank, a desorption tank, an adsorption tank, and a drying tank are respectively provided in the multiple sets of positioning mounting slots. Connectors (102) with solenoid valves are provided at both ends of the absorption tank, the desorption tank, the adsorption tank, and the drying tank. The solenoid valves of the multiple sets of connectors (102) are all connected to the control module. (2) Electrical connection; a display (103) is provided on the base frame (1) on one side of the assembly frame (101), and the display (103) is electrically connected to the control module (2); the pretreatment box (3) has a hollow structure, and an air inlet pipe is provided on one side of the pretreatment box (3), and a first check valve (201) is sleeved on the air inlet pipe; a coarse filter (202) is provided on the inner side of the pretreatment box (3) near the air inlet pipe, and the coarse filter (202) has a multi-faceted baffle structure; a bag filter (203) and a membrane filter (204) are also provided in sequence in the pretreatment box (3) at the top of the coarse filter (202).

2. The low-concentration carbon dioxide feed gas recovery device according to claim 1, characterized in that: The membrane filter (204) has an assembly platform in a stepped manner on the inner side of the pretreatment box (3) at the top. The assembly platform has two sets of trays (301), and the two sets of trays (301) are respectively filled with desiccant and impurity remover.

3. The low-concentration carbon dioxide feed gas recovery device according to claim 2, characterized in that: The pretreatment box (3) is disassembled and equipped with a box cover (4) at the top. A rubber sealing gasket (401) is provided between the box cover (4) and the pretreatment box (3). Multiple sets of pipe clamps are provided at the bottom of the box cover (4). A heat exchange tube (402) is coiled inside the pretreatment box (3). The heat exchange tube (402) is clamped in the pipe clamps, and both ends of the heat exchange tube (402) are embedded in the box cover (4). Temperature and humidity sensors (403) are also provided on the box cover (4) between the multiple sets of pipe clamps.

4. The low-concentration carbon dioxide feed gas recovery device according to claim 3, characterized in that: An air pump (501) is also provided on the mounting platform on which the pretreatment box (3) is installed. A second check valve (502) is provided on the air outlet pipe of the pretreatment box (3). The air inlet of the air pump (501) is connected to the second check valve (502) through a pipeline. The air outlet of the air pump (501) is connected to the connector (102) at the bottom of the absorption tank through a pipeline. The temperature and humidity sensor (403) and the air pump (501) are both electrically connected to the control module (2).

5. The low-concentration carbon dioxide feed gas recovery device according to claim 1, characterized in that: Two sets of detection holes are provided on the outer surfaces of the absorption tank, the desorption tank, the adsorption tank and the drying tank. A pressure sensor (601) for monitoring the tank pressure and a component sensor (602) for monitoring the gas composition in the tank are respectively installed in the two sets of detection holes. The pressure sensor (601) and the component sensor (602) are electrically connected to the control module (2).

6. A low-concentration carbon dioxide feed gas recovery device according to claim 5, characterized in that: The same set of exhaust gas pipes (701) are connected to the connector (102) at the top of the absorption tank, the desorption tank, the adsorption tank and the drying tank. The exhaust gas recovery pipe is provided at the top of the air inlet pipe of the pretreatment box (3). The exhaust gas pipe (701) and the exhaust gas recovery pipe are connected by a pipeline.

7. A low-concentration carbon dioxide feed gas recovery device according to claim 6, characterized in that: The connector (102) at the bottom of the absorption tank, the desorption tank, the adsorption tank and the drying tank is provided with a communicating vessel (801), and multiple sets of communicating vessels (801) are connected in sequence.

8. A low-concentration carbon dioxide feed gas recovery device according to claim 7, characterized in that: A buffer tank (5) and a gas compressor (6) are horizontally arranged on the base frame (1) near the control module (2). The drying tank, the buffer tank (5) and the gas compressor (6) are connected in sequence through pipelines. The gas outlet of the gas compressor (6) is connected to an external gas storage device.

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