Microwave electrothermal composite desorption experimental device for carbon dioxide capture by alcohol amine method

Abstract

The utility model discloses a microwave electric heating composite desorption experimental device for alcohol amine method trapping carbon dioxide, which comprises an absorption tower, an air inlet channel connected to the bottom of the absorption tower, an air outlet channel connected to the top of the absorption tower, a desorption tower, an exhaust channel connected to the top of the desorption tower, a lean liquid channel and a rich liquid channel connected in parallel between the absorption tower and the desorption tower, a microwave heating unit installed on the side wall of the desorption tower to provide heat for the desorption tower, an electric heating unit installed inside the desorption tower to provide heat for the desorption tower, a measurement and control system for controlling the reaction conditions of the absorption tower and detecting the temperature, pressure data in the desorption tower and the exhaust flow in the exhaust channel, which can realize the same working condition comparison test of the two desorption modes of microwave heating and electric heating.

Description

Technical Field

[0001] This utility model relates to the field of carbon capture technology, and in particular to a microwave electrothermal composite desorption experimental device for capturing carbon dioxide by the alkanolamine method. Background Technology

[0002] The amine absorption method is one of the most mature and widely applicable carbon dioxide capture technologies in industrial and laboratory fields, boasting advantages such as high capture efficiency, good technical stability, and strong adaptability. The core process flow consists of two main modules: absorption and regeneration. Specifically, the carbon dioxide-containing feed gas is subjected to countercurrent contact with the amine absorbent in the absorption tower. The carbon dioxide in the gas phase is absorbed and captured by the liquid phase, forming a carbon dioxide-rich amine solution. The carbon dioxide-rich solution is then transported to the desorption and regeneration unit, where heating promotes the desorption and precipitation of carbon dioxide, completing the carbon dioxide enrichment and recovery. Simultaneously, the amine absorbent is regenerated, and the regenerated lean solution can be returned to the absorption tower for recycling, thus achieving continuous carbon dioxide capture operations.

[0003] The desorption-regeneration process is the core energy-consuming unit in the amine-based carbon dioxide capture process, and the quality of the regeneration technology directly determines the overall energy consumption level and operating efficiency of the capture system. Currently, laboratory and pilot-scale amine-based carbon dioxide capture experimental devices generally use a single traditional electric heating mode to complete the rich-liquid desorption operation. This heating method has inherent defects such as poor heat transfer uniformity, low thermal utilization rate, and high regeneration energy consumption, which significantly increases the operating cost of carbon dioxide capture. At the same time, the existing experimental equipment has limited functionality and cannot conduct parallel comparative tests of microwave desorption and traditional electric heating desorption processes under the same experimental platform and benchmark operating conditions.

[0004] Therefore, there is an urgent need to develop an experimental device that can be compatible with both microwave heating desorption and traditional electric heating desorption in the same system, so as to realize parallel comparative experiments of the two desorption processes under the same conditions. Utility Model Content

[0005] To overcome the above deficiencies, this invention provides a microwave electrothermal composite desorption experimental device for capturing carbon dioxide using the alcohol amine method, aiming to improve the aforementioned problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A microwave-electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alcoholamine method includes: The absorption tower has an air inlet channel connected to its bottom and an air outlet channel connected to its top. The desorption tower has an exhaust channel connected to its top, and a lean liquid channel and a rich liquid channel are connected in parallel between the absorption tower and the desorption tower; a microwave heating unit that provides heat to the desorption tower is installed on the side wall of the desorption tower, and an electric heating unit that provides heat to the desorption tower is installed inside the desorption tower. The monitoring and control system is used to control the reaction conditions of the absorption tower and to detect the temperature, pressure data and exhaust flow rate in the exhaust channel of the desorption tower.

[0007] As an alternative or supplement to the microwave electrothermal composite desorption experimental device for capturing carbon dioxide by the amine method, a gas distributor is provided at the bottom of the absorption tower, and the inlet of the gas distributor is connected to the outlet of the gas inlet channel. A nozzle is provided at the top of the absorption tower, and the inlet of the nozzle is connected to the lean liquid channel. A sieve plate and a packing layer are arranged sequentially from bottom to top in the middle of the absorption tower. The aperture of the sieve plate is smaller than the particle size of the packing in the packing layer.

[0008] As an alternative or supplement to the microwave electrothermal composite desorption experimental device for capturing carbon dioxide using the amine method, the inlet channel is connected to a first inlet branch pipe and a second inlet branch pipe. The first inlet branch pipe is used to transport nitrogen, and the second inlet branch pipe is used to transport carbon dioxide. The outlets of the first inlet branch pipe and the outlets of the second inlet branch pipe are both connected to the inlet channel. A gas mixer is installed on the inlet channel. After the nitrogen and carbon dioxide are mixed evenly by the gas mixer, they enter the absorption tower from the bottom of the absorption tower.

[0009] As an alternative or supplement to the aforementioned microwave electrothermal composite desorption experimental apparatus for capturing carbon dioxide using the amine method, the measurement and control system includes a first flow meter, a second flow meter, a third flow meter, and a temperature control jacket. The first flow meter is installed on the first inlet branch pipe and is used to detect the amount of nitrogen transported in the first inlet branch pipe. The second flow meter is installed on the second inlet branch pipe and is used to detect the amount of carbon dioxide transported in the second inlet branch pipe. A first gas-liquid separator is installed on the outlet channel, and a third flow meter is installed at the outlet end of the first gas-liquid separator to detect the remaining amount of carbon dioxide in the outlet channel. The temperature control jacket is connected to an external temperature control device, which is used to control the reaction temperature inside the absorption tower.

[0010] As an alternative or supplement to the microwave electrothermal composite desorption experimental apparatus for capturing carbon dioxide using the amine method, a stirring device is installed inside the desorption tower. The power input end of the stirring device extends to the outside of the desorption tower and is connected to a servo motor. The stirring device is driven by the servo motor.

[0011] As an alternative or supplement to the microwave-electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alcohol amine method, both the lean liquid channel and the rich liquid channel are equipped with a storage tank and a delivery pump. The lean liquid is collected in the storage tank of the lean liquid channel and then transported in the lean liquid channel through the delivery pump of the lean liquid channel; the rich liquid is collected in the storage tank of the rich liquid channel and then transported in the rich liquid channel through the delivery pump of the rich liquid channel.

[0012] As an alternative or supplement to the above-mentioned microwave electrothermal combined desorption experimental device for capturing carbon dioxide by the alcohol amine method, the microwave electrothermal combined desorption experimental device also includes at least one heat exchanger, which is arranged on the lean liquid channel and / or the rich liquid channel, with one heat exchanger located at the junction of the lean liquid channel and the rich liquid channel to realize heat exchange between the lean liquid and the rich liquid.

[0013] As an alternative or supplement to the microwave electrothermal composite desorption experimental device for capturing carbon dioxide using the alcohol amine method, a condenser for condensing the desorbed gas and a second gas-liquid separator for gas-liquid separation of the condensed gas are sequentially arranged on the exhaust channel.

[0014] As an alternative or supplement to the microwave electrothermal composite desorption experimental apparatus for capturing carbon dioxide using the amine method, the measurement and control system includes a temperature sensor, a pressure sensor, and a fourth flow meter. The temperature sensor and pressure sensor are installed inside the desorption tower, and the fourth flow meter is installed on the exhaust channel and used to detect the flow rate of carbon dioxide in the exhaust channel.

[0015] As an alternative or supplement to the above-mentioned microwave electrothermal combined desorption experimental device for capturing carbon dioxide by the amine method, the microwave electrothermal combined desorption experimental device also includes a controller. The first flow meter, second flow meter, third flow meter, temperature control device, stirring device, infusion pump, microwave heating unit and electric heating unit in the microwave electrothermal combined desorption experimental device are all electrically connected to the controller.

[0016] This utility model has the following beneficial effects: This invention's desorption experimental apparatus integrates a microwave heating unit arranged on the side wall and a built-in electric heating unit on the same desorption tower. With the help of a measurement and control system, it can conduct comparative experiments on microwave desorption and electric heating desorption processes under the same baseline operating conditions. It can also accurately detect the core operating parameters of temperature and pressure inside the desorption tower and the carbon dioxide exhaust flow rate parameters of the exhaust channel in real time, so as to realize the monitoring, traceability and quantification of parameters throughout the desorption process, and achieve accurate acquisition and quantitative analysis of experimental parameters. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the desorption experimental apparatus of this utility model. Explanation of reference numerals in the attached figures: 100-Absorption tower; 110-Inlet channel; 120-Outlet channel; 130-Gas distributor; 140-Nozzle; 150-Sieve plate; 160-Packing layer; 111-First flow meter; 112-Second flow meter; 121-Third flow meter; 122-First gas-liquid separator; 200-Desorption tower; 210-Exhaust channel; 211-Fourth flow meter; 220-Lean liquid channel; 230-Rich liquid channel; 240-Microwave heating unit; 250-Electric heating unit; 260-Stirring device; 270-Servo motor; 300-Gas mixer; 400-Temperature control device; 500-Storage tank; 600-Infusion pump; 700-Heat exchanger; 800-Second gas-liquid separator. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example like Figure 1 As shown in the figure, this embodiment discloses a microwave-electrothermal composite desorption experimental device for capturing carbon dioxide using the amine method. It is mainly used for comparative experimental research on carbon dioxide capture and desorption using the amine method. The core objective is to achieve parallel comparative experiments of microwave desorption and electrothermal desorption processes under the same baseline experimental conditions. Simultaneously, it can accurately collect and quantify key parameters such as temperature, pressure, and gas flow rate throughout the entire experimental process, effectively solving industry problems such as the single heating mode, inconsistent experimental conditions for different processes, poor parameter acquisition accuracy, and weak traceability of experimental data in traditional amine desorption experimental devices. This device is based on a complete amine solution absorption-desorption cycle process design, with all structural components cooperating and working collaboratively to form an integrated closed-loop experimental system.

[0020] The device consists of two core tower components: an absorption tower 100 and a desorption tower 200. The bottom of the absorption tower 100 is connected to the inlet channel 110, and the top is connected to the outlet channel 120. The bottom and top of the absorption tower 100 are used to simulate the feeding of flue gas and the exhaust of tail gas after carbon dioxide absorption, respectively. The top of the desorption tower 200 is connected to the exhaust channel 210, which is used to discharge the high-purity carbon dioxide gas generated by the desorption reaction. The absorption tower 100 and the desorption tower 200 are connected in parallel to the lean liquid channel 220 and the rich liquid channel 230, thereby constructing an alcohol amine solution circulation loop to realize a continuous experimental process of recirculating and reusing the lean liquid after desorption and transporting the rich liquid after carbon dioxide adsorption for desorption. To enable a comparative desorption experiment using two processes, this device integrates a composite heating structure on the desorption tower 200. The composite heating structure includes a microwave heating unit 240 and an electric heating unit 250. The microwave heating unit 240 is mounted on the side wall of the desorption tower 200 and heats the solution inside the tower through external microwave radiation. The electric heating unit 250 is installed inside the desorption tower 200 and adopts an immersion direct heating mode. The two heating units are independent of each other and can be started and stopped separately. The comparative experiment of the two heating desorption processes can be completed without changing the experimental equipment.

[0021] Thus, the simulated flue gas enters the absorption tower 100 through the inlet channel 110. The carbon dioxide in the simulated flue gas is absorbed by the lean liquid in the absorption tower 100 and then discharged through the outlet channel 120. The lean liquid that has absorbed carbon dioxide in the absorption tower 100 becomes a rich liquid and is transported to the desorption tower 200 along the rich liquid channel 230. The carbon dioxide in the rich liquid in the desorption tower 200 is released and discharged through the exhaust channel 210. The microwave heating unit 240 and the electric heating unit 250 respectively provide heat to the desorption tower 200 so that the carbon dioxide in the rich liquid in the desorption tower 200 can be released. The rich liquid that has released carbon dioxide in the desorption tower 200 becomes a lean liquid and is transported to the absorption tower 100 along the lean liquid channel 220.

[0022] The microwave-electrothermal composite desorption experimental device, equipped with a dedicated measurement and control system, can control the reaction conditions of the absorption tower 100 throughout the process, ensuring that the two processes of microwave desorption and traditional electrothermal desorption are carried out under the same operating conditions. It can also monitor the internal temperature and pressure parameters of the desorption tower 200 and the carbon dioxide flow parameters of the exhaust channel 210 in real time, ensuring that the experimental process is controllable and the data is accurate and quantifiable.

[0023] To further optimize the gas-liquid contact reaction effect of the absorption tower 100 and ensure the stability and consistency of carbon dioxide absorption, the absorption tower 100 integrates a multi-stage gas distribution, spraying, and mass transfer structure. A gas distributor 130, connected to the outlet of the inlet channel 110, is installed at the bottom of the absorption tower 100. The gas distributor 130 can evenly distribute the mixed flue gas entering the tower, preventing insufficient gas-liquid contact caused by airflow deviation or excessively high local gas velocities. A nozzle 140, connected to the lean liquid channel 220, is installed at the top of the absorption tower 100. The nozzle 140 can atomize and spray the returned alkanolamine lean liquid, thereby effectively increasing the gas-liquid two-phase contact area and enhancing the carbon dioxide adsorption and absorption effect. Meanwhile, in the middle of the absorption tower 100, a sieve plate 150 and a packing layer 160 are arranged sequentially from bottom to top. The pore size of the sieve plate 150 is smaller than the particle size of the packing layer 160, which can not only stably support the packing structure but also provide secondary uniform distribution of the rising airflow. The upper packing layer 160 can significantly increase the gas-liquid contact area, enhance the gas-liquid mass transfer efficiency, improve the carbon dioxide absorption effect, and provide a stable basic operating condition for multiple parallel comparative experiments. In this embodiment, Pall rings can be used as the packing layer 160.

[0024] To accurately simulate the flue gas composition environment in industrial settings and ensure that experimental data closely matches actual industrial application scenarios, the inlet channel 110 of the microwave-electrothermal composite desorption experimental device is connected to two independent first and second inlet branches. These branches respectively supply nitrogen and carbon dioxide as experimental gas sources. The outlets of both branches are connected to the inlet channel 110. A gas mixer 300 is installed on the inlet channel 110. The gases from the two inlet branches converge in the inlet channel 110 and undergo turbulent shearing and uniform mixing through the gas mixer 300, forming a simulated industrial flue gas with a stable composition concentration. This simulated industrial flue gas is then uniformly fed into the absorption tower 100 to participate in the gas-liquid absorption reaction. The dual independent gas supply structure allows for flexible adjustment of the carbon dioxide volume concentration in the flue gas, meeting the experimental requirements for carbon dioxide capture and desorption under different inlet composition conditions and adapting to multivariate experimental research scenarios.

[0025] The microwave electrothermal composite desorption experimental device is equipped with a measurement and control system that integrates multiple sets of flow detection and temperature control devices to achieve precise control of parameters throughout the experimental process. Specifically, the measurement and control system includes a first flow meter 111, a second flow meter 112, a third flow meter 121, and a temperature control jacket (not shown in the figure). The first and second inlet branches are respectively equipped with the first and second flow meters 111 and 112. The first and second flow meters 111 and 112 can accurately detect the inlet flow rates of nitrogen and carbon dioxide in real time, thereby ensuring that the operator can accurately control the concentration of simulated flue gas components through flow ratio. A first gas-liquid separator 122 is installed on the outlet channel 120 of the absorption tower 100, which can effectively separate the alkanolamine droplets entrained in the tail gas, avoiding interference from liquid phase impurities with the detection accuracy. The outlet end of the first gas-liquid separator 122 is equipped with a third flow meter 121, which can detect the residual carbon dioxide flow rate in the tail gas after carbon dioxide absorption in real time, providing accurate data support for calculating the carbon dioxide absorption efficiency, ensuring that the amount of carbon dioxide absorbed in the rich liquid is the same, and ensuring the accuracy of the comparative experimental data. Meanwhile, a temperature control jacket is set around the absorption tower 100, and a temperature control device 400 is connected to the outside of the temperature control jacket, so as to accurately control the reaction temperature inside the absorption tower 100, ensure that the reaction temperature of the two process experiments is the same, and realize the absorption control experiment under different temperature conditions, strictly ensuring that the experimental variable is single and the operating conditions are controllable.

[0026] To eliminate the problems of uneven solution temperature and delayed carbon dioxide bubble precipitation during the combined heating process, and to ensure uniform and stable operating conditions at the desorption end, a stirring device 260 is installed inside the desorption tower 200. The power input end of the stirring device 260 extends to the outside of the tower body and is connected to the servo motor 270 for transmission. During microwave heating or electric heating desorption experiments, the servo motor 270 can drive the stirring device 260 to operate at a uniform speed, forcibly disturbing and mixing the amine-rich solution in the tower. On the one hand, this accelerates the uniform heat transfer in the tower, eliminates local temperature differences, and makes the heating effect of microwave heating and electric heating more balanced. On the other hand, it can disrupt the gas-liquid interfacial tension, promote the rapid precipitation and floating of carbon dioxide bubbles generated during desorption, improve the desorption reaction efficiency, and ensure a high degree of uniformity in the flow field and temperature field conditions of the comparative experiments of the two heating processes.

[0027] To achieve stable, continuous, and quantitative closed-loop circulation of the amine solution and ensure material balance in the absorption-desorption system, both the lean solution channel 220 and the rich solution channel 230 are equipped with integrated storage tanks 500 and delivery pumps 600. The lean and rich solutions are collected in their respective storage tanks 500 and then transported within their respective channels (i.e., lean solution channel 220 and rich solution channel 230) via their respective delivery pumps 600. The storage tank 500 temporarily buffers the lean and rich solutions in the pipeline, effectively buffering pipeline pressure fluctuations and eliminating delivery pulses, achieving stable pressure and flow delivery. The delivery pump 600, as the core power source for solution circulation, can precisely control the solution delivery flow rate, ensuring stable delivery of the rich solution to the desorption tower 200 and stable return of the regenerated lean solution to the absorption tower 100, completely avoiding experimental condition deviations caused by flow fluctuations and ensuring completely uniform material delivery conditions for multiple parallel experiments.

[0028] Furthermore, at least one heat exchanger 700 is installed on the lean liquid channel 220 and the rich liquid channel 230, and one of the heat exchangers 700 is located at the intersection of the two solution channels to realize the reverse heat exchange between the high-temperature lean liquid and the low-temperature rich liquid. By recovering waste heat, the rich liquid entering the desorption tower 200 is preheated, which can effectively reduce the heating energy consumption of the microwave heating unit 240 and the electric heating unit 250, reduce the temperature fluctuation of the rich liquid entering the tower, stabilize the initial reaction conditions of the desorption tower 200, further improve the accuracy and reliability of the comparative experiment data, and at the same time cool down the regenerated lean liquid, effectively reducing the energy consumption of the temperature control equipment 400.

[0029] A condenser and a second gas-liquid separator 800 are integrated sequentially along the airflow direction on the exhaust channel 210 of the desorption tower 200, forming a complete tail gas purification structure. The high-temperature carbon dioxide tail gas generated by the desorption reaction carries alkanolamine vapor and water vapor. The tail gas is first cooled and condensed by the condenser, causing the water vapor and alkanolamine vapor to liquefy and separate. Then, it passes through the second gas-liquid separator 800 to complete the gas-liquid separation, effectively preventing the alkanolamine solvent from being lost with the tail gas, reducing the consumption of experimental consumables, and completely eliminating the interference of liquid phase impurities on the tail gas flow rate detection, ensuring the accuracy of the desorption product flow parameter detection. On this basis, the measurement and control system also includes temperature sensors and pressure sensors integrated and installed inside the desorption tower 200, as well as a fourth flow meter 211 installed in the exhaust channel 210. This allows for real-time acquisition of the core operating parameters of temperature and pressure inside the desorption tower 200, while accurately detecting the flow rate of carbon dioxide gas generated by desorption, realizing real-time monitoring, dynamic acquisition, and quantitative analysis of parameters throughout the desorption process.

[0030] All electrical components of this device (including the first flow meter 111, the second flow meter 112, the third flow meter 121, the temperature control device 400, the stirring device 260, the infusion pump 600, the microwave heating unit 240, and the electric heating unit 250) are electrically connected to the device's controller. The controller enables integrated automatic control of device start-up and shutdown, operating parameter adjustment, experimental data acquisition, and data storage and analysis. Combined with the core structural design of the device's microwave-electrothermal composite desorption, it can complete comparative experiments of two desorption processes under unified benchmark conditions. This allows for the monitoring, traceability, and quantification of parameters throughout the experimental process, significantly improving the accuracy and scientific rigor of the amine-based carbon dioxide capture and desorption experiment.

[0031] The specific experimental process of this utility model is as follows: Before the experiment, the controller sets the experimental parameters such as nitrogen and carbon dioxide inlet flow rates, absorption temperature, desorption temperature, and stirring speed; during the experiment, nitrogen and carbon dioxide enter the device through the first inlet branch pipe and the second inlet branch pipe, respectively. After being accurately measured by the first flow meter 111 and the second flow meter 112, they are mixed evenly in the gas mixer 300 and evenly distributed upward by the gas distributor 130 at the bottom of the absorption tower 100; at the same time, the liquid pump 600 delivers the low-temperature alcohol amine lean solution to the top nozzle 140 of the absorption tower 100 for spraying and falling. The gas and liquid phases are in full countercurrent contact in the area of ​​the sieve plate 150 and the packing layer 160 to complete the carbon dioxide absorption. The decarbonization tail gas is discharged from the outlet channel 120 at the top of the absorption tower 100, and the carbon dioxide content in the decarbonization tail gas is detected by the third flow meter 121. The absorbed amine-rich solution is pumped into the desorption tower 200 by the infusion pump 600. The servo motor 270 drives the stirring device 260. The side-wall microwave heating unit 240 or the internal electric heating unit 250 can be activated separately. Two sets of desorption comparison experiments are conducted under the same equipment and baseline conditions. The high-temperature mixed gas produced by desorption is condensed by the condenser and separated by the second gas-liquid separator 800 to obtain high-purity carbon dioxide, which is measured by the fourth flow meter 211. The regenerated high-temperature lean solution is cooled by the heat exchanger 700 and then returned to the absorption tower 100 for recycling. Throughout the experiment, the monitoring and control system collects and records various operating parameters in real time, completing a comparative analysis of the efficiency and energy consumption of microwave desorption and electric heating desorption.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A microwave-electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method, characterized in that, The microwave electrothermal composite desorption experimental device includes: An absorption tower (100) is provided with an air inlet channel (110) at its bottom and an air outlet channel (120) at its top. A desorption tower (200) is provided with an exhaust channel (210) connected to its top. A lean liquid channel (220) and a rich liquid channel (230) are connected in parallel between the absorption tower (100) and the desorption tower (200). A microwave heating unit (240) for providing heat to the desorption tower (200) is installed on the side wall of the desorption tower (200), and an electric heating unit (250) for providing heat to the desorption tower (200) is installed inside the desorption tower (200). The measurement and control system is used to control the reaction conditions of the absorption tower (100) and to detect the temperature and pressure data in the desorption tower (200) and the exhaust flow rate in the exhaust channel (210).

2. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, A gas distributor (130) is provided at the bottom of the absorption tower (100). The inlet of the gas distributor (130) is connected to the outlet of the air inlet channel (110). A nozzle (140) is provided at the top of the absorption tower (100). The inlet of the nozzle (140) is connected to the lean liquid channel (220). A sieve plate (150) and a packing layer (160) are arranged sequentially from bottom to top in the middle of the absorption tower (100). The aperture of the sieve plate (150) is smaller than the particle size of the packing in the packing layer (160).

3. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, The air intake channel (110) is connected to a first air intake branch pipe and a second air intake branch pipe. The first air intake branch pipe is used to transport nitrogen, and the second air intake branch pipe is used to transport carbon dioxide. The outlets of the first air intake branch pipe and the second air intake branch pipe are both connected to the air intake channel (110). A gas mixer (300) is provided on the air intake channel (110). After the nitrogen and the carbon dioxide are mixed evenly by the gas mixer (300), they enter the absorption tower (100) from the bottom.

4. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 3, characterized in that, The measurement and control system includes a first flow meter (111), a second flow meter (112), a third flow meter (121), and a temperature control jacket. The first flow meter (111) is installed on the first inlet branch pipe and is used to detect the amount of nitrogen transported in the first inlet branch pipe. The second flow meter (112) is installed on the second inlet branch pipe and is used to detect the amount of carbon dioxide transported in the second inlet branch pipe. A first gas-liquid separator (122) is provided on the outlet channel (120), and the third flow meter (121) is provided at the outlet end of the first gas-liquid separator (122). The absorption tower (100) is used to detect the remaining amount of carbon dioxide in the outlet channel (120). The temperature control jacket is connected to an external temperature control device (400), and the temperature control device (400) is used to control the reaction temperature in the absorption tower (100).

5. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, The desorption tower (200) is equipped with a stirring device (260). The power input end of the stirring device (260) extends to the outside of the desorption tower (200) and is connected to the servo motor (270). The stirring device (260) is driven by the servo motor (270).

6. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, Both the lean liquid channel (220) and the rich liquid channel (230) are equipped with a storage tank (500) and an infusion pump (600). The lean liquid is collected in the storage tank (500) of the lean liquid channel (220) and then transported in the lean liquid channel (220) through the infusion pump (600). The rich liquid is collected in the storage tank (500) of the rich liquid channel (230) and then transported in the rich liquid channel (230) through the infusion pump (600).

7. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, The microwave electrothermal composite desorption experimental apparatus further includes at least one heat exchanger (700), which is disposed on the lean liquid channel (220) and / or the rich liquid channel (230), wherein one of the heat exchangers (700) is located at the junction of the lean liquid channel (220) and the rich liquid channel (230) to realize heat exchange between the lean liquid and the rich liquid.

8. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, The exhaust channel (210) is sequentially provided with a condenser for condensing the gas generated by desorption and a second gas-liquid separator (800) for gas-liquid separation of the condensed gas.

9. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 8, characterized in that, The measurement and control system includes a temperature sensor, a pressure sensor and a fourth flow meter (211). The temperature sensor and the pressure sensor are installed inside the desorption tower (200), and the fourth flow meter (211) is installed on the exhaust channel (210) and used to detect the flow rate of carbon dioxide in the exhaust channel (210).

10. The microwave electrothermal combined desorption experimental apparatus for capturing carbon dioxide using the alkanolamine method according to claim 1, characterized in that, The microwave-electrothermal composite desorption experimental device also includes a controller. The first flow meter (111), the second flow meter (112), the third flow meter (121) of the measurement and control system, as well as the temperature control device (400), the stirring device (260), the infusion pump (600), the microwave heating unit (240), and the electric heating unit (250) of the microwave-electrothermal composite desorption experimental device are all electrically connected to the controller.

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