Carbon Capture Absorbent Performance Testing System

Abstract

The present invention discloses a performance testing system for a carbon capture absorbent. The performance testing system for a carbon capture absorbent includes a carbon capture unit, an external circulation unit, and a detection component. The carbon capture unit allows carbon dioxide to react with the absorbent solution. The external circulation unit includes an external circulation pipeline, a temperature control device, and a driving device. The temperature control device and the driving device are both arranged on the external circulation pipeline, and the temperature control device can regulate the temperature of the absorbent solution in the external circulation pipeline. The driving device can drive the absorbent solution to circulate between the external circulation pipeline and the carbon capture unit. The detection component can detect the carbon capture rate of the carbon capture unit. The performance testing system for a carbon capture absorbent of the present invention can simulate the temperatures of various processes in the actual carbon capture industry through the temperature control device, and obtain the loss amount of the absorbent in the actual carbon capture process by detecting the loss amount of the absorbent content under the simulated working conditions, so as to provide a basis for reasonably supplementing the absorbent dosage and maintaining a stable carbon capture efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and specifically, to a performance testing system for a carbon capture absorbent. Background Art

[0002] At present, the main industrial carbon capture technical means are chemical absorption method and physical adsorption method. Among them, the chemical absorption method mainly uses an absorbent solution to separately separate carbon dioxide from industrial flue gas for collection. Its reaction principle is: after the absorbent solution reacts with carbon dioxide, a stable compound solution will be formed, and then this compound solution will decompose and restore to carbon dioxide gas and absorbent solution under the action of high temperature, thereby realizing the separate collection of carbon dioxide, and at the same time, the absorbent solution can be recycled for repeated use.

[0003] In the related art, affected by temperature changes in various processes of carbon capture, such as the rich and lean liquid heat exchange process, the desorption tower heating process, the reflux cooling process, etc., the absorbent is prone to volatilization or degradation, and there is a certain degree of absorbent loss. Therefore, it is necessary to supplement the absorbent during the carbon capture process to maintain the normal progress of carbon capture. However, the specific loss rate of the absorbent under various processes of carbon capture is difficult to clarify, resulting in the inability of operators to supplement the absorbent as needed, affecting the carbon capture efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a performance testing system for a carbon capture absorbent in view of the defects and deficiencies of the prior art. The carbon capture absorbent performance testing system can simulate each process in the carbon capture industrial circulation system, and simulate the temperature of each process in the actual working condition through a temperature control device. By detecting the loss amount of the absorbent content in the simulated working condition, the loss amount of the absorbent in the actual carbon capture process can be obtained, so as to provide a basis for reasonably supplementing the absorbent dosage and maintaining a stable carbon capture efficiency. In addition, the carbon capture absorbent performance testing system of the present application can also be used to observe the influencing factors of the absorbent loss rate, such as the absorption tower temperature, the desorption tower heating temperature, the carbon capture device manufacturing material, etc. Thus, the absorbent loss rate can be reduced through experimental results, and the carbon capture process can be further optimized.

[0005] The carbon capture absorbent performance testing system according to an embodiment of the present invention includes: a carbon capture unit for reacting carbon dioxide with an absorbent solution to absorb carbon dioxide; an external circulation unit including an external circulation pipeline, a temperature regulating device, and a driving device. The inlet of the external circulation pipeline is communicated with the liquid outlet of the carbon capture unit, and the outlet of the external circulation pipeline is communicated with the liquid inlet of the carbon capture unit. The temperature regulating device and the driving device are both arranged on the external circulation pipeline. The temperature regulating device is used to regulate the temperature of the absorbent solution in the external circulation pipeline, and the driving device is used to drive the absorbent solution to circulate between the external circulation pipeline and the carbon capture unit; a detection component that can be used to detect the carbon capture rate of the carbon capture unit.

[0006] In the carbon capture absorbent performance testing system according to an embodiment of the present invention, the external circulation unit can use the driving device to transfer the absorbent solution from the carbon capture unit to the temperature regulating device. Then, the temperature regulating device can simulate the temperature change that occurs in the actual carbon capture process by adjusting the temperature of the absorbent solution. After that, the absorbent solution after temperature adjustment flows back to the carbon capture unit through the external circulation pipeline and reacts with carbon dioxide. Finally, the detection component can detect the carbon capture rates of the absorbent solution with and without temperature adjustment. The two sets of data can be compared to obtain the change in the carbon dioxide absorption capacity of the absorbent solution under this simulated working condition, and then the absorbent loss rate can be obtained. Thus, the carbon capture absorbent performance testing system of the present application simulates each process in the actual carbon capture industrial cycle through simplified experimental equipment, simulates the temperature of each process in the actual working condition through the temperature regulating device, and obtains the loss amount of the absorbent in the actual carbon capture process by detecting the loss amount of the absorbent content in the simulated working condition, thereby providing a basis for reasonably supplementing the absorbent dosage and maintaining a stable carbon capture efficiency.

[0007] In addition, the carbon capture absorbent performance testing system of the present application can also be used to observe the influencing factors of the absorbent loss rate, such as the absorption tower temperature, the desorption tower heating temperature, the carbon capture device manufacturing material, etc. Thus, the absorbent loss rate can be reduced through the experimental results, and the carbon capture process can be further optimized.

[0008] In some embodiments, the detection component includes a first detection piece and a second detection piece. The first detection piece is arranged at the gas inlet of the carbon capture unit to detect the carbon dioxide content in the incoming gas, and the second detection piece is arranged at the gas outlet of the carbon capture unit to detect the carbon dioxide content in the discharged gas.

[0009] In some embodiments, the temperature regulating device includes a heater and a heat exchanger. The external circulation pipeline includes a liquid inlet pipeline communicating with the liquid outlet of the carbon capture unit and a liquid return pipeline communicating with the liquid inlet of the carbon capture device. The cold source chamber of the heat exchanger communicates with the liquid inlet pipeline, and the heat source chamber of the heat exchanger communicates with the liquid return pipeline. The heater is arranged on the pipeline between the outlet of the cold source chamber and the inlet of the heat source chamber.

[0010] In some embodiments, the temperature regulating device further includes a cooler, and the cooler is arranged on the outlet pipeline of the heat source chamber for cooling the high-temperature absorbent solution flowing out of the heat source chamber.

[0011] In some embodiments, the heater is an electric heater or a heat pipe heater.

[0012] In some embodiments, the external circulation unit further includes an anti-foaming device. The driving device is arranged between the liquid outlet of the carbon capture unit and the temperature regulating device, and the anti-foaming device is arranged between the driving device and the temperature regulating device.

[0013] In some embodiments, the external circulation unit further includes a metering pump, and the metering pump is arranged between the anti-foaming device and the temperature regulating device.

[0014] In some embodiments, the external circulation unit further includes a back pressure valve, and the back pressure valve is arranged on the external circulation pipeline.

[0015] In some embodiments, the carbon capture absorbent performance testing system further includes a temperature detection component, and the temperature detection component can be used to detect the temperatures of the liquid inlet and liquid outlet of the carbon capture unit, as well as the temperatures at the inlets and outlets of each component of the external circulation unit.

[0016] In some embodiments, the temperature detection component includes a plurality of thermometers, and the plurality of thermometers can be correspondingly arranged at each temperature measurement point. The thermometer is a K-type stainless steel thermocouple. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a carbon capture absorbent performance testing system according to an embodiment of the present invention.

[0018] Reference Signs:

[0019] Carbon capture unit 1, external circulation unit 2, driving device 21, temperature regulating device 22, heat exchanger 221, heater 222, cooler 223, external circulation pipeline 23, liquid inlet pipeline 231, liquid return pipeline 232, detection component 3, first detection piece 31, second detection piece 32, back pressure valve 4, anti-foaming device 5, metering pump 6. Detailed Embodiments

[0020] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0021] As Figure 1 shown, the carbon capture absorbent performance testing system of the embodiments of the present invention includes a carbon capture unit 1, an external circulation unit 2, and a detection component 3.

[0022] Specifically, the carbon capture unit 1 is used for reacting carbon dioxide with an absorbent solution to absorb carbon dioxide. The external circulation unit 2 includes an external circulation pipeline 23, a temperature regulating device 22, and a driving device 21. The inlet of the external circulation pipeline 23 is communicated with the liquid outlet of the carbon capture unit 1, and the outlet of the external circulation pipeline 23 is communicated with the liquid inlet of the carbon capture unit 1. The temperature regulating device 22 and the driving device 21 are both arranged on the external circulation pipeline 23. The temperature regulating device 22 is used for regulating the temperature of the absorbent solution in the external circulation pipeline 23, and the driving device 21 is used for driving the absorbent solution to circulate between the external circulation pipeline 23 and the carbon capture unit 1. The detection component 3 can be used to detect the carbon capture rate of the carbon capture unit 1.

[0023] It should be noted that the carbon capture absorbent performance testing system of the present application is designed based on the temperature regulation process experienced by the absorbent solution in actual production. That is, in actual production, the absorbent solution first absorbs carbon dioxide in industrial flue gas in an absorption tower to form a carbon dioxide-rich solution, and then the carbon dioxide-rich solution flows into a desorption tower for high-temperature desorption. The carbon dioxide-rich solution decomposes into carbon dioxide gas and a carbon dioxide-lean solution (i.e., the original absorbent solution). Then, the carbon dioxide gas enters a gas storage tank for storage, and the carbon dioxide-lean solution is cooled and then flows back into the absorption tower to participate in the next carbon capture cycle. During this process, the high-temperature carbon dioxide-rich solution also exchanges heat with the low-temperature carbon dioxide-rich solution to enhance the waste heat utilization in the carbon capture process.

[0024] That is to say, in the carbon capture absorbent performance testing system of the present application, the carbon capture unit 1 can replace the absorption tower to enable the absorbent solution to absorb carbon dioxide. The external circulation unit 2 can use the driving device 21 to transfer the absorbent solution from the carbon capture unit 1 to the temperature regulating device 22. Then, the temperature regulating device 22 can simulate the temperature changes that occur in carbon capture processes such as heating the absorbent solution in the desorption tower, heat exchange between rich and lean solutions, and cooling and recovery of the lean solution by adjusting the temperature of the absorbent solution. After that, the absorbent solution after temperature adjustment flows back to the carbon capture unit 1 through the external circulation pipeline 23 and reacts with carbon dioxide. Finally, the detection component 3 can reflect the carbon capture rate of the absorbent solution by detecting the change in the carbon dioxide content in the carbon capture unit 1.

[0025] To facilitate the understanding of the usage method of the carbon capture absorbent performance testing system of the present application, the following description is given in combination with the carbon capture absorbent performance testing process. For example, during the experiment, a group of absorbent solutions can be prepared first and directly used for carbon capture in the carbon capture unit 1 (that is, at this time, the external circulation unit 2 is closed and the absorbent solution is not temperature-regulated), and the carbon capture rate of this group of absorbent solutions is recorded by the detection component 3. Then, another group of absorbent solutions with the same concentration is prepared, and after the temperature of this group of absorbent solutions is regulated by the external circulation unit 2, carbon capture is carried out in the carbon capture unit 1. Similarly, the carbon capture rate of this group of absorbent solutions is recorded by the detection component 3. Finally, the carbon capture rates of the two groups of absorbent solutions can be compared to obtain the absorbent loss rate of the absorbent under the simulated working conditions.

[0026] It can be understood that the loss of the absorbent is reflected as a decrease in the absorbent concentration in the solution, and it is difficult to accurately measure the absorbent concentration. Therefore, in the present application, the change in the carbon capture rate of the absorbent solution before and after temperature regulation can be used to indirectly characterize the loss rate of the absorbent, that is, the higher the carbon capture rate of the absorbent solution, the lower the absorbent loss rate. On the contrary, the lower the carbon capture rate of the absorbent solution, the lower the absorbent loss rate.

[0027] It can be understood that the same absorbent solution participates in the carbon capture process under different temperature control modes, and the loss rate of the absorbent is different. Or different absorbent solutions participate in the carbon capture process under the same control mode, and the loss rate of the absorbent will also be different. The present application simplifies the experimental equipment to simulate the temperature changes experienced by the absorbent solution during the actual carbon capture process. It can not only accurately regulate the temperature of the absorbent solution according to the actual working conditions, but also avoid the influence of other external factors on the experimental results, thereby obtaining the accurate loss rate of the absorbent under various working conditions, providing a basis for reasonably supplementing the absorbent dosage during the actual carbon capture process, and maintaining a stable carbon capture efficiency.

[0028] It can be understood that the external circulation unit 2 leads out the absorbent solution in the carbon capture unit 1 for temperature control, and this method is more convenient to realize the temperature control mode consistent with the actual working conditions, thereby improving the accuracy of the experiment.

[0029] Preferably, the driving device 21 can adopt a peristaltic pump. The peristaltic pump can realize the transportation of liquid by squeezing the hose. Thus, the absorbent solution only passes through the hose in the pump body, is not easy to produce residues, is extremely easy to clean, can realize pollution-free transportation, and thus ensures that the carbon capture absorbent performance testing system of the present application can be used multiple times, improving the test efficiency.

[0030] In addition, the carbon capture absorbent performance testing system of the present application can also be used to observe the influencing factors of the absorbent loss rate. For example, the change in the carbon capture rate of the absorbent solution can be observed by changing the temperature of the initial absorbent solution in the carbon capture unit 1, and thus the influence of the temperature of the absorption tower on the absorbent loss rate can be obtained. Another example is that the change in the carbon capture rate of the absorbent solution can also be observed by changing the maximum heating temperature in the temperature regulating device 22, and thus the influence of the heating temperature of the desorption tower on the absorbent loss rate can be obtained. Another example is that the change in the carbon capture rate of the absorbent solution can also be observed by changing the production materials of the components of the carbon capture absorbent performance testing system, and thus the influence of the transition material of the absorbent solution on the absorbent loss rate can be obtained. Therefore, the absorbent loss rate can be reduced through the experimental results, and the carbon capture process can be further optimized.

[0031] According to the carbon capture absorbent performance testing system of the embodiment of the present invention, the external circulation unit can use the driving device to transfer the absorbent solution from the carbon capture unit to the temperature regulating device. Then, the temperature regulating device can simulate the temperature change that occurs in the actual carbon capture process by adjusting the temperature of the absorbent solution. After that, the absorbent solution after temperature adjustment flows back to the carbon capture unit through the external circulation pipeline and reacts with carbon dioxide. Finally, the detection component can detect the carbon capture rates of the absorbent solution with and without temperature adjustment. The two groups of data can be compared to obtain the change in the carbon dioxide absorption capacity of the absorbent solution under this simulated working condition, and then the absorbent loss rate can be obtained. Therefore, the carbon capture absorbent performance testing system of the present application simulates each process in the actual carbon capture industrial cycle through simplified experimental equipment, simulates the temperature of each process in the actual working condition through the temperature regulating device, and obtains the loss amount of the absorbent in the actual carbon capture process by detecting the loss amount of the absorbent content in the simulated working condition, so as to provide a basis for reasonably supplementing the absorbent dosage and maintaining a stable carbon capture efficiency.

[0032] In addition, the carbon capture absorbent performance testing system of the present application can also be used to observe the influencing factors of the absorbent loss rate, such as the temperature of the absorption tower, the heating temperature of the desorption tower, the production materials of the carbon capture device, etc. Therefore, the absorbent loss rate can be reduced through the experimental results, and the carbon capture process can be further optimized.

[0033] Furthermore, as Figure 1 shown, the detection component 3 includes a first detection piece 31 and a second detection piece 32. The first detection piece 31 is arranged at the air inlet of the carbon capture unit 1 to detect the content of carbon dioxide in the incoming gas, and the second detection piece 32 is arranged at the air outlet of the carbon capture unit 1 to detect the content of carbon dioxide in the outgoing gas.

[0034] It can be understood that the carbon capture rate of the absorbent solution is manifested as the content of carbon dioxide absorbed by the absorbent solution. In this application, after the carbon capture unit 1 passes in the mixed gas containing carbon dioxide, the first detector 31 is used to detect the content of carbon dioxide in the mixed gas before reacting with the absorbent solution, and the second detector 32 is used to detect the content of carbon dioxide in the mixed gas after reacting with the absorbent solution. By comparing the two sets of detection data, the carbon dioxide reduction amount can be obtained, and the carbon dioxide reduction amount is the content of carbon dioxide absorbed by the absorbent solution, thereby determining the carbon capture rate of the absorbent solution.

[0035] It can be understood that there are various ways for the detection component 3 to detect the change in the carbon dioxide content, such as the carbon isotope labeling method, the infrared absorption method, etc., and it can be reasonably selected according to the experimental conditions.

[0036] Furthermore, as Figure 1 shown, the temperature regulating device 22 includes a heater 222 and a heat exchanger 221. The external circulation pipeline 23 includes a liquid inlet pipeline 231 communicated with the liquid outlet of the carbon capture unit 1 and a liquid return pipeline 232 communicated with the liquid inlet of the carbon capture device. The cold source chamber of the heat exchanger 221 is communicated with the liquid inlet pipeline 231, and the heat source chamber of the heat exchanger 221 is communicated with the liquid return pipeline 232. The heater 222 is arranged on the pipeline between the outlet of the cold source chamber and the inlet of the heat source chamber.

[0037] It can be understood that when the temperature regulating device 22 needs to simulate the temperature change conditions of the absorbent solution in the heating process in the desorption tower or the heat exchange process between rich and lean solutions, the heater 222 and the heat exchanger 221 can be set in the temperature regulating device 22. The cold source chamber of the heat exchanger 221 is passed in the unheated absorbent solution flowing out of the carbon capture unit 1, and the heat source chamber of the heat exchanger 221 is passed in the absorbent solution heated by the heater 222. The two solutions can exchange heat in the heat exchanger 221, thereby simulating the temperature change of the absorbent solution in the heat exchange process between rich and lean solutions. At the same time, the heater 222 can heat the passed-in absorbent solution, thereby simulating the temperature change of the absorbent solution in the heating process in the desorption tower.

[0038] Furthermore, as Figure 1 shown, the temperature regulating device 22 further includes a cooler 223, and the cooler 223 is arranged on the outlet pipeline of the heat source chamber to cool the high-temperature absorbent solution flowing out of the heat source chamber.

[0039] It can be understood that when returning to the absorption tower, the high-temperature absorbent solution needs to be cooled. When simulating this kind of working condition, the cooler 223 can be added to the temperature regulating device 22 in the above-mentioned embodiment, so that the cooler 223 can reduce the temperature of the absorbent solution.

[0040] Furthermore, as Figure 1As shown, the heater 222 is an electric heater or a heat pipe heater.

[0041] It can be understood that the heater 222 is the only heat source in the temperature control device 22. When the heat exchange efficiency of the heat exchanger 221 is certain, the heating temperature of the absorbent solution by the heater 222 directly affects whether the temperature change of the absorbent solution in this simulation condition can be consistent with the actual carbon capture process. Both the electric heater and the heat pipe heater can accurately control the heating temperature of the absorbent solution to ensure meeting the experimental requirements. Preferably, the heat pipe heater is an oil bath heater.

[0042] Furthermore, as Figure 1 shown, the external circulation unit 2 further includes an anti-foaming device 5. The driving device 21 is arranged between the liquid outlet of the carbon capture unit 1 and the temperature control device 22, and the anti-foaming device 5 is arranged between the driving device 21 and the temperature control device 22.

[0043] It can be understood that after the absorbent solution is pumped out by the driving device 21, it will flow through the anti-foaming device 5 and then into the temperature control device 22. Thus, the anti-foaming device 5 can remove the bubbles mixed in the absorbent solution to avoid affecting the experimental effect.

[0044] Furthermore, as Figure 1 shown, the external circulation unit 2 further includes a metering pump 6. The metering pump 6 is arranged between the anti-foaming device 5 and the temperature control device 22.

[0045] It can be understood that the metering pump 6 can adjust the flow rate of the absorbent solution input into the temperature control device 22 to ensure that the absorbent solution can be evenly heated or cooled in the temperature control device 22, thereby improving the reliability of the experimental results.

[0046] Furthermore, as Figure 1 shown, the external circulation unit 2 further includes a back pressure valve 4. The back pressure valve 4 is arranged on the external circulation pipeline 23.

[0047] It can be understood that the back pressure valve 4 can prevent the absorbent solution from flowing back while maintaining the stability of the absorbent solution flow rate, thus ensuring the normal progress of the absorbent performance test experiment.

[0048] Preferably, the back pressure valve 4 is arranged between the cooler 223 and the carbon capture unit 1.

[0049] Furthermore, the carbon capture absorbent performance test system further includes a temperature detection component 3 (not shown). The temperature detection component 3 can be used to detect the temperatures of the liquid inlet and outlet of the carbon capture unit 1, as well as the temperatures at the inlets and outlets of each component of the external circulation unit 2.

[0050] It can be understood that the temperature detection component 3 can dynamically reflect the temperature of the absorbent solution in each flow element, and thus can be used to detect whether the absorbent solution achieves the expected temperature control effect. If there are any omissions, the relevant experiment can be shut down in a timely manner and continued after the problem is solved, thereby ensuring the accuracy of the experimental results.

[0051] Furthermore, the temperature detection component 3 includes a plurality of thermometers, and the plurality of thermometers can be correspondingly arranged at each temperature measurement point. The thermometer is a K-type stainless steel thermocouple.

[0052] It can be understood that the K-type stainless steel thermocouple can quickly and accurately measure the temperature and display the temperature measurement result using an electric meter, thereby facilitating the experimenter to promptly discover abnormal temperature conditions.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0054] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact via an intermediate medium. Further, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflicting, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A carbon capture absorbent performance testing system, characterized in that Comprising: A carbon capture unit for reacting carbon dioxide with an absorbent solution to absorb carbon dioxide; An external circulation unit including an external circulation pipeline, a temperature regulating device, and a driving device. The inlet of the external circulation pipeline is communicated with the liquid outlet of the carbon capture unit, and the outlet of the external circulation pipeline is communicated with the liquid inlet of the carbon capture unit. The temperature regulating device and the driving device are both arranged on the external circulation pipeline. The temperature regulating device is used to regulate the temperature of the absorbent solution in the external circulation pipeline, and the driving device is used to drive the absorbent solution to circulate between the external circulation pipeline and the carbon capture unit; A detection assembly that can be used to detect the carbon capture rate of the carbon capture unit; The temperature regulating device includes a heater and a heat exchanger. The external circulation pipeline includes a liquid inlet pipeline communicated with the liquid outlet of the carbon capture unit and a liquid return pipeline communicated with the liquid inlet of the carbon capture unit. The cold source chamber of the heat exchanger is communicated with the liquid inlet pipeline, and the heat source chamber of the heat exchanger is communicated with the liquid return pipeline. The heater is arranged on the pipeline between the outlet of the cold source chamber and the inlet of the heat source chamber; The temperature regulating device further includes a cooler arranged on the outlet pipeline of the heat source chamber to cool the high-temperature absorbent solution flowing out of the heat source chamber; The external circulation unit further includes an anti-foaming device. The driving device is arranged between the liquid outlet of the carbon capture unit and the temperature regulating device, and the anti-foaming device is arranged between the driving device and the temperature regulating device.

2. The carbon capture absorbent performance testing system according to claim 1, characterized in that The detection assembly includes a first detection piece and a second detection piece. The first detection piece is arranged at the gas inlet of the carbon capture unit to detect the content of carbon dioxide in the incoming gas, and the second detection piece is arranged at the gas outlet of the carbon capture unit to detect the content of carbon dioxide in the discharged gas.

3. The carbon capture absorbent performance testing system according to claim 1, wherein The heater is an electric heater or a heat pipe heater.

4. The carbon capture absorbent performance testing system according to claim 1, wherein The external circulation unit further includes a metering pump arranged between the anti-foaming device and the temperature regulating device.

5. The carbon capture absorbent performance testing system according to any one of claims 1-4, characterized in that The external circulation unit further includes a back pressure valve arranged on the external circulation pipeline.

6. The carbon capture absorbent performance testing system according to any one of claims 1-4, characterized in that It further includes a temperature detection assembly that can be used to detect the temperatures of the liquid inlet and liquid outlet of the carbon capture unit, as well as the temperatures at the inlets and outlets of each component of the external circulation unit.

7. The carbon capture absorbent performance testing system according to claim 6, wherein, The temperature detection assembly includes a plurality of thermometers. The plurality of thermometers can be correspondingly arranged at each temperature measurement point, and the thermometers are K-type stainless steel thermocouples.

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