Visual measurement method and device for desorption rate of CO2 pregnant solution

Abstract

The embodiment of the invention provides a visual measurement method and device for desorption rate of CO2 pregnant solution, and the device comprises a reaction container which is used for accommodating a catalyst / filler and an ethanolamine MEA solution; the video acquisition device is used for acquiring a CO2 desorption video on the surface of the catalyst / filler in the reaction container; the processor is used for extracting a desorption image of the predetermined ROI from the CO2 desorption video; carrying out binarization processing on the desorption image; based on the desorption image after binarization processing, the area of bubbles in the ROI area is measured; calculating the volume of the bubbles in the ROI based on the area of the bubbles in the ROI; on the basis of the image sequence in the CO2 desorption video, determining the time when the bubbles pass through the ROI region, and calculating the CO2 desorption rate of the catalyst / filler per unit area by combining the outer surface area of the catalyst / filler and the volume of the bubbles in the ROI region. The method can avoid the interference of CO2 generated on the non-catalyst surface, and is a novel method capable of directly measuring the formation / growth rate of CO2 on the catalyst surface.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical fields of boiler environmental protection and atmospheric environmental protection, and in particular to a method and device for visually measuring the desorption rate of a CO2 rich liquid. Background Art

[0002] Under the dual carbon goals, chemical desorption is a relatively mature carbon capture, utilization and storage (CCUS) technology. It has been industrially demonstrated in multiple coal-fired units. The bottleneck problem that limits the large-scale application of chemical desorption is mainly the high energy consumption of the desorption process. One of the ways to reduce the high energy consumption of chemical desorption is to add catalyst particles to the desorbent and introduce Bronsted and Lewis acid sites to achieve rich liquid desorption under low temperature conditions. At present, the main method for evaluating the performance of catalysts for enhanced rich liquid desorption of CO2 is the continuous stirring reaction method. This method can only qualitatively measure the performance of different catalysts for enhanced rich liquid desorption of CO2. Since the desorption process of rich liquid can also occur on the reactor wall, the surface of the stirring paddle, and during the rising process of bubbles, this will interfere with the quantitative test of the performance of the catalyst catalyzing the desorption of CO2 from rich liquid. Summary of the invention

[0003] The embodiments of the present invention aim to solve at least one of the technical problems existing in the prior art, and provide a method, system and device for visually measuring the desorption rate of CO2 rich liquid.

[0004] In a first aspect, an embodiment of the present invention provides a visual measurement device for the desorption rate of CO2-rich liquid, the device comprising:

[0005] A reaction container, wherein the reaction container is used to contain a catalyst / filler and an ethanolamine MEA solution;

[0006] A video acquisition device is arranged on one side of the reaction container, and is used to acquire a CO2 desorption video on the surface of the catalyst / filler in the reaction container;

[0007] A processor is electrically connected to the video acquisition device, and is used to extract a CO2 desorption image of a predetermined ROI area from the CO2 desorption video; perform binarization processing on the CO2 desorption image to distinguish bubbles in the CO2 desorption image from the background; measure the area of ​​the bubbles in the ROI area based on the binarized CO2 desorption image; calculate the volume of the bubbles in the ROI area based on the area of ​​the bubbles in the ROI area; and determine the time when the bubbles pass through the ROI area based on the image sequence in the CO2 desorption video, and calculate the CO2 desorption rate per unit area of ​​the catalyst / filler in combination with the external surface area of ​​the catalyst / filler and the volume of the bubbles in the ROI area.

[0008] In some possible embodiments, the CO2 desorption rate per unit area of ​​catalyst / filler is calculated by formula (1):

[0009]

[0010] Among them, v CO2 / area is the CO2 desorption rate per unit area of ​​catalyst / filler, V CO2 is the volume of the bubble in the ROI area, V m is the molar volume of the gas in the standard state, Δt is the time it takes for the bubble to pass through the ROI area, S packing is the external surface area of ​​the catalyst / packing.

[0011] In some possible embodiments, the device further includes a light emitting diode panel with a light diffusion plate;

[0012] The light emitting diode panel and the video acquisition device are respectively arranged on two sides of the reaction container, and the light diffusion plate is sandwiched between the light emitting diode panel and the reaction container.

[0013] In some possible embodiments, the video acquisition device is a digital camera.

[0014] In some possible embodiments, the horizontal centerline of the video acquisition device and the catalyst / filler are at the same height.

[0015] In some possible embodiments, the reaction container is a jacketed beaker; the device further comprises a circulating heating component, and the circulating heating component comprises a pumping element, a circulating pipe and a heating element;

[0016] The first end of the circulation pipe is communicated with the bottom side wall of the jacketed beaker, the second end of the circulation pipe is communicated with the top side wall of the jacketed beaker, and the pumping element and the heating element are sequentially arranged in series on the circulation pipe.

[0017] In some possible embodiments, the circulation heating component further includes a temperature detection element, and the temperature detection element is inserted into the jacketed beaker.

[0018] In some possible embodiments, the ethanolamine solution is 250 ml of a 5M MEA solution with a CO2 loading of 0.47 mol CO2 / mol MEA.

[0019] In a second aspect, an embodiment of the present invention provides a method for visually measuring the desorption rate of a CO2-rich liquid, the method comprising:

[0020] Get a video of CO2 desorption on the catalyst / packing surface;

[0021] Extracting a CO2 desorption image of a predetermined ROI area from the CO2 desorption video;

[0022] Binarizing the CO2 desorption image to distinguish bubbles from the background in the CO2 desorption image;

[0023] Based on the binarized CO2 desorption image, measuring the area of ​​bubbles in the ROI region;

[0024] Based on the area of ​​the bubble in the ROI region, the volume of the bubble in the ROI region is calculated;

[0025] Based on the image sequence in the CO2 desorption video, the time for the bubbles to pass through the ROI area is determined, and the CO2 desorption rate per unit area of ​​the catalyst / filler is calculated in combination with the external surface area of ​​the catalyst / filler and the volume of the bubbles in the ROI area.

[0026] In some possible embodiments, the CO2 desorption rate per unit area of ​​catalyst / filler is calculated by formula (1):

[0027]

[0028] Among them, v CO2 / area is the CO2 desorption rate per unit area of ​​catalyst / filler, V CO2 is the volume of the bubble in the ROI area, V m is the molar volume of the gas in the standard state, Δt is the time it takes for the bubble to pass through the ROI area, S packing is the external surface area of ​​the catalyst / packing.

[0029] The visual measurement method and device of the CO2 rich liquid desorption rate of the embodiment of the present invention records the size of CO2 bubbles desorbed from the catalyst surface and the time passing through the ROI (region of interest) through a video acquisition device, calculates the CO2 desorption rate per unit area of ​​the catalyst, and more accurately and quantitatively measures the enhanced rich liquid CO2 desorption performance of the catalyst. The device can avoid the interference of CO2 generated from non-catalyst surfaces in traditional measurement methods, and is a new method that can directly measure the CO2 formation / growth rate on the catalyst surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of a visual measurement device for the desorption rate of CO2 rich liquid according to an embodiment of the present invention;

[0032] Figure 2 is an image processing flow chart of an embodiment of the present invention;

[0033] Figure 3 Schematic diagram of CO2 bubble volume in the region of interest for different catalysts / fillers at different temperatures in an embodiment of the present invention;

[0034] Figure 4 Flow chart of a method for visually measuring the desorption rate of CO2 rich liquid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0036] Unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. "Including" or "comprising" used in the embodiments of the present invention neither limit the shapes, numbers, steps, actions, operations, components, originals and / or their groups mentioned, nor exclude the appearance or addition of one or more other different shapes, numbers, steps, actions, operations, components, originals and / or their groups, or the addition of these. 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 indicating the number and order of the indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship, and the techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices shown should be considered as part of the authorized specification. In all examples shown and discussed here, any specific other examples may have different values. It should be noted that similar symbols and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the embodiments of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the embodiments of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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, those skilled in the art may combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of the different embodiments or examples, without contradiction.

[0039] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0040] Figure 1 Schematic diagram of the structure of a visual measurement device for the desorption rate of CO2 rich liquid according to an embodiment of the present invention, Figure 2 FIG. 4 is a flowchart of image processing according to an embodiment of the present invention.

[0041] like Figure 1 and Figure 2 As shown, an embodiment of the present invention relates to a visual measurement device for the desorption rate of a CO2 rich liquid, the device comprising: a reaction vessel 101, a video acquisition device 102 and a processor (not shown in the figure). The reaction vessel 101 contains a catalyst / filler and an ethanolamine solution. The video acquisition device 102 is arranged on one side of the reaction vessel 101, and the video acquisition device 102 is used to acquire a CO2 desorption video on the surface of the catalyst / filler in the reaction vessel 101. The processor is electrically connected to the video acquisition device 102.

[0042] Specifically, the processor is used to extract a CO2 desorption image of a predetermined ROI region of interest from the CO2 desorption video; perform binarization processing on the CO2 desorption image to distinguish bubbles in the CO2 desorption image from the background; measure the area of ​​the bubbles in the ROI region based on the binarized CO2 desorption image; calculate the volume of the bubbles in the ROI region based on the area of ​​the bubbles in the ROI region; and, based on the image sequence in the CO2 desorption video, determine the time for the bubbles to pass through the ROI region, and calculate the CO2 desorption rate per unit area of ​​the catalyst / filler in combination with the external surface area of ​​the catalyst / filler and the volume of the bubbles in the ROI region.

[0043] The visual measurement device for the desorption rate of CO2 rich liquid in the embodiment of the present invention records the size of CO2 bubbles desorbed from the catalyst surface and the time it takes to pass through the ROI area through a video acquisition device, calculates the CO2 desorption rate per unit area of ​​the catalyst, and more accurately and quantitatively measures the enhanced rich liquid CO2 desorption performance of the catalyst. The device can avoid the interference of CO2 generated from non-catalyst surfaces in traditional measurement methods, and is a new method that can directly measure the CO2 formation / growth rate on the catalyst surface.

[0044] For example, Figure 1 and Figure 2 As shown, the CO2 desorption rate per unit area of ​​catalyst / filler is calculated by formula (1):

[0045]

[0046] Among them, v CO2 / area is the CO2 desorption rate per unit area of ​​catalyst / filler, V CO2 is the volume of the bubble in the ROI area, V mis the molar volume of the gas in the standard state, Δt is the time it takes for the bubble to pass through the ROI area, S packing is the external surface area of ​​the catalyst / packing.

[0047] For example, Figure 1 As shown, the device further includes an LED panel 104 with a light diffuser 103. The LED panel 104 and the video acquisition device 102 are respectively arranged on both sides of the reaction container 101, and the light diffuser 103 is sandwiched between the LED panel 104 and the reaction container 101.

[0048] In the visual measurement device for the desorption rate of CO2-rich liquid in an embodiment of the present invention, the diffuser plate can disperse the light emitted by the light emitting diode to make the illumination more uniform. This can avoid highlight areas and shadows caused by direct light, thereby improving the quality of the image. Direct use of light emitting diodes may cause strong reflections or reflection points on the surface of the cup, which will interfere with image capture. Diffusion of light through a diffuser plate can effectively reduce these reflections, making objects in the image more clearly visible. Uniform and soft lighting helps to improve the contrast between different parts of the image, which is very important for video processing and analysis. Good contrast can make it easier for image processing algorithms to identify and distinguish different objects or features. In addition, the use of a diffuser plate in combination with an LED panel can adjust the light intensity and angle as needed. This flexibility enables the system to better adapt to different shooting conditions and environmental requirements.

[0049] For example, Figure 1 As shown, the video acquisition device 102 adopts a digital camera, which can usually provide very high resolution, which means that the video can capture more details. High-quality sensors and advanced image processing technology ensure the authenticity of color restoration and image clarity, thereby improving the accuracy of subsequent calculation of CO2 rich liquid desorption rate.

[0050] For example, Figure 1 As shown, the horizontal center line of the video acquisition device 102 and the catalyst / filler are at the same height. This arrangement can ensure the consistency of the shooting angle, which is particularly important for situations where multiple samples need to be compared or long-term tracking research is conducted, because a consistent angle of view can reduce the error caused by changes in the shooting angle. In particular, when shooting objects that need to be accurately measured, keeping the camera at the same height as the object to be measured can reduce perspective distortion, making the image more realistic and accurate, thereby further improving the accuracy of subsequent calculations of the CO2 rich liquid desorption rate.

[0051] For example, Figure 1As shown, the reaction vessel 101 is a jacketed beaker. The device further includes a circulating heating component, which includes a pumping element 105, a circulating pipe 106, and a heating element 107. The first end of the circulating pipe 106 is connected to the bottom side wall of the jacketed beaker, and the second end of the circulating pipe 106 is connected to the top side wall of the jacketed beaker. The pumping element 105 and the heating element 107 are sequentially arranged in series on the circulating pipe 106. In some embodiments, the pumping element 105 can be a peristaltic pump, and the heating element 107 can be a water bath pot, etc.

[0052] The visual measurement device for the desorption rate of CO2 rich liquid in the embodiment of the present invention can heat the reaction container through the circulating heating component, so as to measure the CO2 desorption rate per unit area of ​​catalyst / filler at different temperatures. Furthermore, when different catalysts / fillers are placed in the reaction container, the CO2 desorption rate per unit area of ​​catalyst / filler at different temperatures can be further obtained.

[0053] For example, Figure 1 As shown, the circulating heating assembly further includes a temperature detection element 108, which is inserted into the jacket beaker. The temperature detection element 108 can be a thermocouple or the like.

[0054] For example, Figure 1 As shown, the ethanolamine solution is 250 ml of a 5M MEA solution with a CO2 loading of 0.47 mol CO2 / mol MEA.

[0055] The visual measurement device for the desorption rate of CO2 rich liquid of the present invention will be described below with a specific example.

[0056] like Figure 1As shown, a jacketed beaker with a specification of 300 ml is used as a reaction vessel 101. A light-emitting diode (LED) panel 104 with a diffuser 103 is placed on one side of the jacketed beaker. The size of the LED panel is 180 mm × 130 mm. A digital camera is placed on the other side to capture images of desorption bubbles above the catalyst / filler. A single catalyst / filler is placed at the bottom of the jacketed beaker. 250 ml of a 5M MEA solution with a CO2 load of 0.47 mol CO2 / mol MEA is added to the beaker, and circulating hot water (96°C) is used in the jacket to heat the rich solution in the beaker. The flow rate of the circulating hot water is controlled by a peristaltic pump and the flow rate is 1680 ml / min. As the temperature of the MEA solution increases, CO2 desorption occurs on the surface of the catalyst / filler. When the solution temperature reaches 60, 65, 70, 75 and 80°C, a digital camera equipped with a macro lens is used to record the CO2 desorption process. The horizontal center line of the camera's field of view is at the same height as the catalyst / filler, the camera's shooting frame rate is set to 240 frames / second, the ISO is set to 160, the exposure time is 1 / 1000 second, and the shooting field of view is 20mm×12mm. The post-processing process of the visualization method is as follows Figure 2 As shown in Figure 1, a 10-second video of the desorption process of CO2 bubbles on the catalyst / filler surface was first recorded with a camera. In this video, a region of interest (ROI, see Figure 1 ) is used to focus on the bubbles desorbing above the catalyst. The images extracted from the high-speed video are then binarized to separate the bubbles from the background. The area of ​​the bubbles within the ROI region is then identified and measured, and the volume of the bubbles in the ROI can be determined by assuming that the bubbles are spherical. In addition, the image sequence of the high-speed video is used to determine the time it takes for the bubbles to pass through the ROI, and combined with the external surface area of ​​the catalyst / packing, the CO2 desorption rate per unit area of ​​the catalyst / packing can be determined.

[0057] In order to quantitatively analyze the desorption rate of rich liquid CO2 on the surface of different catalysts / fillers, a high-speed video of the desorption process of rich liquid CO2 on the surface of catalysts / fillers in the range of 60-80°C was recorded for 10 seconds, and the high-speed video was processed to obtain 100 sets of CO2 bubble volume data of rich liquid desorption in the ROI area at intervals of 0.1 s, such as Figure 3 As shown, Figure 3 (a) represents catalyst 1; (b) represents catalyst 2; (c) represents catalyst 3; (d) represents ceramic saddle ring packing; (e) represents glass spring packing; (f) represents stainless steel saddle ring packing; (g) represents stainless steel screen packing; (h) represents glass balls.

[0058] from Figure 3It can be seen that under different types of catalysts / fillers at different temperatures, the CO2 bubble volume data points in the ROI area are uniformly dispersed around a certain value. Taking the data of catalyst 1 as an example, when the desorption temperature is in the range of 60-70℃, the desorption amount of CO2 is low, and the average volume of CO2 bubbles in the ROI area is 3.67×10 -5 mL~1.52×10 -3 mL. When the temperature continued to rise to 75℃ and 80℃, the average volume of CO2 bubbles was 7.66×10 -3 mL and 1.25×10 -2 mL, the fluctuation of data is mainly caused by the density of bubbles and the occasional appearance of large bubbles, but the volume data of CO2 bubbles still fluctuates around the average value. This shows that the visualization method is accurate and reliable in measuring the CO2 desorption rate per unit area on the catalyst surface.

[0059] Based on the same inventive concept, an embodiment of the present invention relates to a method for visually measuring the desorption rate of CO2 rich liquid. The method can be implemented by the visual measurement device described above. For details, please refer to the relevant records above and will not be repeated here. Figure 4 Flow chart of a method for visually measuring the desorption rate of CO2 rich liquid according to an embodiment of the present invention.

[0060] like Figure 4 As shown, the method includes the following steps S401 to S406:

[0061] Step S401, obtaining a CO2 desorption video on the catalyst / filler surface.

[0062] Step S402: extracting a CO2 desorption image of a predetermined ROI area from the CO2 desorption video.

[0063] Step S403: binarize the CO2 desorption image to separate the bubbles from the background in the CO2 desorption image.

[0064] Step S404: measuring the area of ​​the bubbles in the ROI region based on the binarized CO2 desorption image.

[0065] Step S405: Calculate the volume of the bubbles in the ROI region based on the area of ​​the bubbles in the ROI region.

[0066] Step S406: Based on the image sequence in the CO2 desorption video, determine the time for the bubbles to pass through the ROI area, and calculate the CO2 desorption rate per unit area of ​​the catalyst / filler in combination with the external surface area of ​​the catalyst / filler and the volume of the bubbles in the ROI area.

[0067] The visual measurement method of the CO2 rich liquid desorption rate in an embodiment of the present invention records the size of CO2 bubbles desorbed from the catalyst surface and the time passing through the ROI (region of interest) through a video acquisition device, calculates the CO2 desorption rate per unit area of ​​the catalyst, and more accurately and quantitatively measures the enhanced rich liquid CO2 desorption performance of the catalyst. The device can avoid the interference of CO2 generated from non-catalyst surfaces in traditional measurement methods, and is a new method that can directly measure the CO2 formation / growth rate on the catalyst surface.

[0068] In some embodiments, the CO2 desorption rate per unit area of ​​the catalyst / filler is calculated by formula (1):

[0069]

[0070] Among them, v CO2 / area is the CO2 desorption rate per unit area of ​​catalyst / filler, V CO2 is the volume of the bubble in the ROI area, V m is the molar volume of the gas in the standard state, Δt is the time it takes for the bubble to pass through the ROI area, S packing is the external surface area of ​​the catalyst / packing.

[0071] In some embodiments, the obtaining of CO2 desorption videos on the catalyst / filler surface includes: obtaining CO2 desorption videos on the surfaces of different catalysts / fillers at different temperatures;

[0072] The calculating of the CO2 desorption rate per unit area of ​​catalyst / filler comprises: calculating the CO2 desorption rate per unit area of ​​catalyst / filler of different catalysts / fillers at different temperatures.

[0073] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A visual measurement device for the desorption rate of CO2-rich liquid, characterized in that: The device comprises: A reaction container, wherein the reaction container is used to contain a catalyst / filler and an ethanolamine MEA solution; A video acquisition device is arranged on one side of the reaction container, and is used to acquire a CO2 desorption video on the surface of the catalyst / filler in the reaction container; A processor is electrically connected to the video acquisition device, and is used to extract a CO2 desorption image of a predetermined ROI area from the CO2 desorption video; perform binarization processing on the CO2 desorption image to distinguish bubbles in the CO2 desorption image from the background; measure the area of ​​the bubbles in the ROI area based on the binarized CO2 desorption image; calculate the volume of the bubbles in the ROI area based on the area of ​​the bubbles in the ROI area; and determine the time when the bubbles pass through the ROI area based on the image sequence in the CO2 desorption video, and calculate the CO2 desorption rate per unit area of ​​the catalyst / filler in combination with the external surface area of ​​the catalyst / filler and the volume of the bubbles in the ROI area.

2. The device according to claim 1, characterized in that The CO2 desorption rate per unit area of ​​catalyst / filler is calculated by formula (1): Among them, v CO2 / area is the CO2 desorption rate per unit area of ​​catalyst / filler, V CO2 is the volume of the bubble in the ROI area, V m is the molar volume of the gas in the standard state, Δt is the time it takes for the bubble to pass through the ROI area, S packing is the external surface area of ​​the catalyst / packing.

3. The device according to claim 1, characterized in that The device also includes a light emitting diode panel with a light diffusion plate; The light emitting diode panel and the video acquisition device are respectively arranged on two sides of the reaction container, and the light diffusion plate is sandwiched between the light emitting diode panel and the reaction container.

4. The device according to any one of claims 1 to 3, characterized in that The video acquisition device adopts a digital camera.

5. The device according to any one of claims 1 to 3, characterized in that: The horizontal centerline of the video acquisition device is at the same height as the catalyst / filler.

6. The device according to any one of claims 1 to 3, characterized in that The reaction container is a jacketed beaker; the device also includes a circulating heating component, which includes a pumping element, a circulating pipe and a heating element; The first end of the circulation pipe is communicated with the bottom side wall of the jacketed beaker, the second end of the circulation pipe is communicated with the top side wall of the jacketed beaker, and the pumping element and the heating element are sequentially arranged in series on the circulation pipe.

7. The device according to claim 6, characterized in that The circulating heating component also includes a temperature detection element, which is inserted into the jacketed beaker.

8. The device according to any one of claims 1 to 3, characterized in that The ethanolamine solution is 250 ml of a 5M MEA solution with a CO2 loading of 0.47 mol CO2 / mol MEA.

9. A visual measurement method for the desorption rate of CO2 rich liquid, characterized in that: The method comprises: Get a video of CO2 desorption on the catalyst / packing surface; Extracting a CO2 desorption image of a predetermined ROI area from the CO2 desorption video; Binarizing the CO2 desorption image to distinguish bubbles from the background in the CO2 desorption image; Based on the binarized CO2 desorption image, measuring the area of ​​bubbles in the ROI region; Based on the area of ​​the bubble in the ROI region, the volume of the bubble in the ROI region is calculated; Based on the image sequence in the CO2 desorption video, the time for the bubbles to pass through the ROI area is determined, and the CO2 desorption rate per unit area of ​​the catalyst / filler is calculated in combination with the external surface area of ​​the catalyst / filler and the volume of the bubbles in the ROI area.

10. The method according to claim 9, characterized in that The CO2 desorption rate per unit area of ​​catalyst / filler is calculated by formula (1): Among them, v CO2 / area is the CO2 desorption rate per unit area of ​​catalyst / filler, V CO2 is the volume of the bubble in the ROI area, V m is the molar volume of the gas in the standard state, Δt is the time it takes for the bubble to pass through the ROI area, S packing is the external surface area of ​​the catalyst / packing.

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