Desorption device for carbon dioxide capture

Abstract

The utility model discloses a desorption device for carbon dioxide capture, which relates to the field of carbon dioxide capture and comprises a shell and a demister arranged in the shell, and a drainage mechanism is arranged below the demister. The drainage mechanism comprises a fixing rod fixedly connected to the demister, and an inclined drainage plate is arranged on the fixing rod. According to the desorption device for capturing the carbon dioxide, the inclined drainage plate is arranged below the demister, and the lower end of the drainage plate can be communicated with the collecting device, so that when water drops in the demister drop, part of the water drops drop on the drainage plate and flow into the collecting device along the drainage plate, and the water drops in the demister are separated from the collecting device. The amount of water drops falling into the rich solution is reduced, so that the desorption efficiency of the rich solution can be improved; part of water drops are blocked by the drainage plate, so that the probability that carbon dioxide is brought into the rich solution again by the water drops can be reduced, and the desorption efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the field of carbon dioxide capture, in particular to a desorption device for carbon dioxide capture. Background Art

[0002] It is well known that flue gas containing a large amount of carbon dioxide is generated in industrial production. In order to remove the carbon dioxide in the flue gas, an organic amine solution is usually used to absorb the carbon dioxide in the flue gas to obtain a rich liquid containing carbon dioxide. The rich liquid is then introduced into a desorption tower for heating, so that the carbon dioxide can be separated from the rich liquid and collected uniformly.

[0003] For example, the Chinese patent document entitled "A Composite Carbon Dioxide Desorption Tower" with the authorization announcement number CN212215061U and the announcement date 2020-12-25 comprises a purified gas outlet (1), a demister (2), a first liquid inlet distributor (3), a tray (4), a packing layer (5), an interlayer liquid distributor (6), a second liquid inlet distributor (7), a tray (8), a gas-liquid mixed inlet pipe (9), a liquid outlet pipe (10), a first liquid inlet pipe (12), a second liquid inlet pipe (13) and a tower body. The utility model adopts an internal structure in which the packing and the tray are respectively arranged. When the carbon dioxide required to be produced under the actual operating conditions is small, the required rich amine liquid flow rate is small. Only the tray part of the tower body can be used for steam stripping desorption, and the packing part can be used as a demister, thereby greatly reducing the amount of carbon dioxide gas carried by the tower top; it can also overcome the problems of bias flow and low operational flexibility of the packed tower, and at the same time can enhance the adaptability to different performance alcohol amine solutions.

[0004] The shortcomings of the above-mentioned existing technologies are that a demister is provided near the top wall of the desorption tower. The demister can block the water vapor contained in the desorption process and condense it into water droplets that fall into the rich liquid. Obviously, the water droplets falling into the rich liquid will have a dilution effect on the rich liquid, thereby reducing the desorption efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a carbon dioxide capture and desorption device to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A desorption device for capturing carbon dioxide comprises a shell and a demister arranged inside the shell, wherein a drainage mechanism is provided below the demister; the drainage mechanism comprises a fixing rod fixedly connected to the demister, wherein an inclined drainage plate is provided on the fixing rod.

[0008] In the above-mentioned carbon dioxide capture and desorption device, a plurality of guide plates are provided, and the plurality of guide plates are arranged in an array on the fixing rod.

[0009] In the above-mentioned carbon dioxide capture and desorption device, the cross-section of the guide plate is triangular.

[0010] In the above-mentioned carbon dioxide capture and desorption device, the cross-section of the guide plate is trapezoidal.

[0011] In the above-mentioned carbon dioxide capture and desorption device, a guide groove is provided on the guide plate.

[0012] In the above-mentioned carbon dioxide capture and desorption device, an annular groove is provided on the inner wall of the shell, and the annular groove is located at the outlet end of the guide groove.

[0013] In the above-mentioned carbon dioxide capture and desorption device, a drain pipe is provided on the shell, and the drain pipe is communicated with the inner space of the annular groove.

[0014] In the above-mentioned carbon dioxide capture and desorption device, the inner bottom wall of the annular groove is arranged inclined.

[0015] In the above-mentioned carbon dioxide capture and desorption device, a passive diversion component is provided on the guide plate.

[0016] In the above-mentioned carbon dioxide capture and desorption device, the passive diversion component includes a diversion hole opened on the guide plate, and a baffle is slidably provided on the guide plate.

[0017] In the above technical solution, the utility model provides a carbon dioxide capture and desorption device, which is provided with an inclined guide plate below the demister. The lower end of the guide plate can be connected to a collection device. When water droplets in the demister fall, some of the water droplets will fall on the guide plate and flow along the guide plate into the collection device, thereby reducing the amount of water droplets falling into the rich liquid, thereby improving the desorption efficiency of the rich liquid.

[0018] Moreover, some water droplets are blocked by the drainage plate, thereby reducing the probability of water droplets bringing carbon dioxide back into the rich liquid, thereby further improving the desorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1A schematic cross-sectional view of an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the connection structure between the fixing rod and the guide plate provided in another embodiment of the present utility model;

[0022] Figure 3 for Figure 1 A magnified schematic diagram of the local structure at point A.

[0023] Description of reference numerals:

[0024] 1. Shell; 2. demister; 3. fixing rod; 4. guide plate; 5. liquid inlet; 6. liquid outlet; 7. exhaust port; 8. packing layer; 9. guide groove; 10. annular groove; 11. drain pipe; 12. water outlet; 13. diversion hole; 14. baffle; 15. cavity; 16. spring. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] In the description of this utility model, it is necessary to understand that Figure 1 The position of the middle exhaust port 7 relative to the liquid outlet 6 is above, and vice versa. The terms "center", "longitudinal", "transverse", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0027] Reference Figure 1-3 A desorption device for capturing carbon dioxide provided by an embodiment of the present invention includes a shell 1 and a demister 2 arranged inside the shell 1, and a drainage mechanism is provided below the demister 2; the drainage mechanism includes a fixing rod 3 fixed to the demister 2, and an inclined drainage plate 4 is provided on the fixing rod 3.

[0028] Specifically, the shell 1 is connected with a liquid inlet 5, a liquid outlet 6 and an exhaust port 7, and a packing layer 8 is provided inside the shell 1. The demister 2 is provided inside the shell 1, and the vertical height of the demister 2 is located between the liquid inlet 5 and the exhaust port 7. During the desorption process, due to the high temperature, the desorbed carbon dioxide will contain a part of water vapor, so it is necessary to remove the water vapor in the carbon dioxide through the demister 2. During the water vapor removal process, the water vapor itself will condense into water droplets and fall into the rich liquid again. This is the prior art and will not be repeated. One of the core innovations of the embodiment of the present utility model is that a drainage mechanism is provided below the demister 2, and the drainage mechanism includes a device fixed to the lower surface of the demister 2. The fixed rod 3 on the surface and the guide plate 4 obliquely arranged on the fixed rod 3, the fixed rod 3 is coaxially arranged with the demister 2, and the inclined arrangement means that one end of the guide plate 4 connected to the fixed rod 3 is higher than the other end, and the lower end of the guide plate 4 can be connected to a collecting device. The purpose of such an arrangement is that when the water droplets in the demister 2 fall, some of the water droplets will fall on the guide plate 4 and flow along the guide plate 4 to the collecting device, so as to reduce the amount of water droplets falling into the rich liquid, thereby improving the desorption efficiency of the rich liquid; and some water droplets are blocked by the guide plate 4, thereby reducing the probability of collision between the water droplets and the carbon dioxide, thereby avoiding as much as possible the carbon dioxide being brought into the rich liquid by the water droplets again, thereby further improving the desorption efficiency.

[0029] Preferably, the deflector plates 4 are provided in plurality, and the deflector plates 4 are arranged in an array on the fixing rod 3. Specifically, the deflector plates 4 are preferably six, and the six deflector plates 4 can increase the receiving area for water droplets to improve the drainage effect.

[0030] Preferably, the cross section of the guide plate 4 is triangular. Specifically, the guide plate 4 is arranged upside down, that is, its two inclined surfaces are arranged at the bottom. When the carbon dioxide gas contacts the inclined surfaces of the guide plate 4, it will avoid to both sides, thus reducing the wind resistance when the carbon dioxide moves upward.

[0031] Furthermore, the guide plate 4 is provided with a guide groove 9. Specifically, the guide groove 9 is provided on the upper surface of the guide plate 4 and is recessed toward the inside of the guide plate 4. Water droplets falling on the guide plate 4 will slide into the guide groove 9, thereby minimizing the water flow from the guide plate 4.

[0032] Furthermore, an annular groove 10 is provided on the inner wall of the housing 1, and the annular groove 10 is located at the outlet end of the guide groove 9. Specifically, the annular groove 10 is provided along the inner wall of the housing 1, and the annular groove 10 is provided below the outlet ends of the plurality of guide grooves 9. When water droplets fall into the guide groove 9, and because the guide groove 9 is arranged at an angle along the guide plate 4, the water droplets will fall into the annular groove 10 for uniform collection.

[0033] Furthermore, the housing 1 is provided with a drain pipe 11, which is in communication with the interior of the annular groove 10. An inclined water outlet 12 is provided on the side wall of the housing 1, through which the drain pipe 11 is in communication with the interior of the annular groove 10. A control component, such as a valve, may be provided on the drain pipe 11. When too many water droplets fall into the annular groove 10, the valve is opened, and the accumulated water in the annular groove 10 is discharged through the water outlet 12 and the drain pipe 11.

[0034] Preferably, the inner bottom wall of the annular groove 10 is arranged inclined. The inclined arrangement means that the vertical height of the inner bottom wall of the annular groove 10 near the water outlet 12 is lower than the height of the inner bottom wall at other positions, forming an annular slope, so that the inner bottom wall of the annular groove 10 is concave toward the water outlet 12, thereby facilitating the discharge of water from the drain pipe 11.

[0035] As another embodiment of the present invention, the cross-section of the guide plate 4 is preferably trapezoidal, and the trapezoid is inverted, that is, the area below the guide plate 4 is smaller than the area above it, so that wind resistance can be reduced while guiding.

[0036] Furthermore, a passive diversion component is provided on the guide plate 4; the passive diversion component includes a diversion hole 13 provided on the guide plate 4, and a baffle 14 is slidably provided on the guide plate 4. Specifically, a cavity 15 is provided on the guide plate 4, and the baffle 14 is slidably provided inside the cavity 15, and a spring 16 is provided between the baffle 14 and the top wall of the cavity 15. The baffle 14 has a first position for blocking the diversion hole 13 and a second position for opening the diversion hole 13. The purpose of such a setting is that during normal desorption, that is, when carbon dioxide is normally generated, the baffle 14 is in the first position. At this time, the generated carbon dioxide will pass through the gap between the two adjacent guide plates 4, and then enter the demister 2 and be discharged. When there is too much local carbon dioxide, the local demisting capacity of the demister 2 will be overloaded, thereby reducing the demisting effect. At this time, the carbon dioxide will have a negative impact on the local desorption. The pressure of the guide plate 4 (which may be a certain guide plate 4) is too large, which will squeeze the corresponding baffle 14. When the pressure of the carbon dioxide gas is greater than the elastic force of the spring 16, the baffle 14 will slide into the cavity 15, thereby passively switching the baffle 14 from the first position to the second position. At this time, the diverter hole 13 is opened, and the carbon dioxide will enter the cavity 15, and then diverge to both sides through the diverter hole 13 to achieve the diversion effect. When the pressure of the carbon dioxide is less than the sum of the elastic force of the spring 16 and the gravity of the baffle 14, the baffle 14 is passively switched from the second position to the first position under the action of the elastic force of the spring 16 to achieve automatic reset of the baffle 14.

[0037] Preferably, the diverter hole 13 is arranged at an angle, that is, one end of the diverter hole 13 close to the center line of the guide plate 4 is higher than the other end thereof, so that the carbon dioxide is discharged obliquely downward from the diverter hole 13, thereby increasing the distance of the carbon dioxide diverging to both sides, thereby improving the diversion effect of the carbon dioxide.

[0038] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A carbon dioxide capture and desorption device, comprising a housing and a demister disposed inside the housing, characterized in that: A drainage mechanism is provided below the demister; The drainage mechanism comprises a fixing rod fixedly connected to the demister, and an inclined drainage plate is provided on the fixing rod.

2. A carbon dioxide capture and desorption device according to claim 1, characterized in that: There are multiple guide plates, and the guide plates are arranged in an array on the fixing rod.

3. The carbon dioxide capture and desorption device according to claim 1, characterized in that: The cross section of the guide plate is triangular.

4. The carbon dioxide capture and desorption device according to claim 1, characterized in that: The cross section of the guide plate is trapezoidal.

5. The carbon dioxide capture and desorption device according to claim 1, characterized in that: The guide plate is provided with a guide groove.

6. The carbon dioxide capture and desorption device according to claim 5, characterized in that: An annular groove is provided on the inner wall of the shell, and the annular groove is located at the outlet end of the guide groove.

7. The carbon dioxide capture and desorption device according to claim 6, characterized in that: The shell is provided with a drain pipe, and the drain pipe is communicated with the inner space of the annular groove.

8. The carbon dioxide capture and desorption device according to claim 7, characterized in that: The inner bottom wall of the annular groove is arranged inclined.

9. The carbon dioxide capture and desorption device according to claim 4, characterized in that: A passive diversion component is provided on the guide plate.

10. The carbon dioxide capture and desorption device according to claim 9, characterized in that: The passive diversion component includes a diversion hole opened on the diversion plate, and a baffle is slidably provided on the diversion plate.

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