Carbon dioxide catalytic desorption composite tower

Abstract

The invention relates to the technical field of carbon dioxide desorption, in particular to a carbon dioxide catalytic desorption composite tower which comprises a tower body, a plurality of tower plates are arranged in the tower body at intervals from top to bottom and are arranged in parallel in the horizontal direction, one end of each tower plate is connected with a downcomer, and the other end of each tower plate is connected with the inner side wall of the tower body. Wherein the tower body ends of two adjacent tower plates are respectively connected with the opposite inner side walls of the tower body, a plurality of sieve holes are formed in the tower plates, the non-tower-plate end of the downcomer is connected with the inner side wall of the tower body, a floating plate is arranged in the downcomer, a plurality of liquid guide holes are formed in the floating plate, a catalyst shell and a plurality of floating balls are arranged on the floating plate, and the floating balls are arranged in the catalyst shell. A catalyst shell is arranged in the tower body, a catalyst is filled in the catalyst shell, a plurality of liquid inlet holes are formed in the surface of the catalyst shell, a filler layer is arranged at the inner bottom of the tower body, and liquid distributors are arranged above the filler layer and above at least one tower plate. By using the composite tower, the desorption temperature of the rich solution of the alcohol amine solution can be effectively reduced, and the desorption rate can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon dioxide desorption, and in particular to a carbon dioxide catalytic desorption composite tower. Background Art

[0002] At present, the most mature technology in the field of industrial carbon dioxide capture is the chemical absorption method using alcohol amine solutions. The desorption process is mainly carried out in a plate tower or a packed tower. The rich alcohol amine solution is heated by the introduced steam to achieve the desorption of carbon dioxide. However, this process usually requires the rich alcohol amine solution temperature to be controlled above 105°C, or even at 130°C, resulting in high energy consumption in the desorption process, which limits the further promotion and application of carbon capture.

[0003] Therefore, there is an urgent need for a carbon dioxide catalytic desorption composite tower to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of high desorption energy consumption and low desorption rate in the desorption process of rich alcohol amine solution in the prior art, and to provide a carbon dioxide catalytic desorption composite tower.

[0005] In order to achieve the above-mentioned object, the present invention provides a carbon dioxide catalytic desorption composite tower, which includes a tower body, wherein a plurality of tower plates are arranged at intervals from top to bottom inside the tower body, and the plurality of tower plates are arranged in parallel in the horizontal direction, one end of the plurality of tower plates is connected to a downcomer, and the other end is connected to the inner side wall of the tower body, wherein the tower body ends of two adjacent tower plates are respectively connected to the inner side walls opposite to the tower body, a plurality of sieve holes are provided on the tower plate, and the non-tower plate end of the downcomer is connected to the inner side wall of the tower body, a floating plate is provided in the downcomer, a plurality of liquid guide holes are provided on the floating plate, a catalyst shell and a plurality of float balls are provided on the floating plate, a catalyst is filled in the catalyst shell, a plurality of liquid inlet holes are provided on the surface of the catalyst shell, a packing layer is provided at the inner bottom of the tower body below the tower plate, and a liquid distributor is provided above the packing layer and above at least one of the tower plates, and the liquid distributor is used to introduce a rich alcohol amine solution.

[0006] Preferably, the height of the catalyst filled in the catalyst housing is 1 / 4 of the total height of the interior of the catalyst housing. .

[0007] Preferably, the height of the float is .

[0008] Preferably, the diameter of the liquid inlet hole is smaller than the particle size of the catalyst.

[0009] Preferably, the lower liquid outlet of the downcomer is connected to a limited position guide pipe.

[0010] Preferably, a cover plate is provided on the sieve hole, and the cover plate is a float valve cover plate or a bubble cover plate.

[0011] Preferably, a liquid distributor is provided above each of the plurality of tower plates.

[0012] Preferably, the filler in the packing layer is a filler with regular tooth top angle.

[0013] Preferably, a demister is provided at the inner top of the tower body above the tower plate.

[0014] Preferably, a regeneration gas inlet and a lean liquid outlet are respectively provided at the top and the bottom of the tower body.

[0015] According to the above technical scheme, based on the carbon dioxide catalytic desorption composite tower, a plate tower and a packed tower are composited, and the plate tower is arranged above the packed tower, and further a plurality of tower plates arranged from top to bottom are arranged inside the plate tower section where the tower body is located above, the plurality of tower plates are arranged in parallel in the horizontal direction, one end of the plurality of tower plates are connected to a downcomer, and the other end is connected to the inner side wall of the tower body, wherein the tower body ends of two adjacent tower plates are respectively connected to the inner side walls opposite to the tower body, a floating plate is arranged inside the downcomer, a plurality of liquid guide holes are opened on the floating plate, a catalyst shell and a plurality of floats are arranged on the floating plate, a catalyst is filled in the catalyst shell, and a plurality of liquid inlet holes are opened on the surface of the catalyst shell; a packing layer is arranged at the bottom of the packed tower section where the tower body is located below; and a liquid distributor is arranged above the packing layer and above at least one tower plate, the liquid distributor is used to introduce a rich alcoholamine solution, and in practical application, the desorption temperature of the rich alcoholamine solution can be effectively reduced and the desorption rate can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a carbon dioxide catalytic desorption composite tower; Figure 2 It is a schematic diagram of the structure of the downcomer of the carbon dioxide catalytic desorption composite tower.

[0017] Description of Reference Numerals 1. Tower body; 2. Tower plate; 21. Sieve hole; 22. Cover plate; 3. Downcomer; 31. Float plate; 32. Float ball; 33. Catalyst shell; 34. Catalyst; 35. Limiting guide tube; 4. Liquid distributor; 5. Packing layer; 6. Defogger. DETAILED DESCRIPTION

[0018] The specific implementation of the embodiment of the present invention is described in detail below. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0019] In the description of the present application, the term “comprise” and any variations thereof mean non-exclusive inclusion, possible existence or addition of one or more other features, units, components and / or combinations thereof.

[0020] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] The present invention provides a carbon dioxide catalytic desorption composite tower, such as Figure 1-2 As shown, the carbon dioxide catalytic desorption composite tower includes a tower body 1, wherein a plurality of tower plates 2 are arranged at intervals from top to bottom inside the tower body 1, wherein the plurality of tower plates 2 are arranged in parallel in the horizontal direction, wherein one end of the plurality of tower plates 2 is connected to a downcomer 3, and the other end is connected to the inner side wall of the tower body 1, wherein the tower body ends of two adjacent tower plates 2 are respectively connected to the inner side walls opposite to the tower body 1, wherein a plurality of sieve holes 21 are opened on the tower plate 2, and the non-tower plate end of the downcomer 3 is connected to the inner side wall of the tower body 1, wherein the tower body ends of two adjacent tower plates 2 are respectively connected to the inner side walls opposite to the tower body 1, and the tower plate 2 is provided with a plurality of sieve holes 21, and the non-tower plate end of the downcomer 3 is connected to the inner side wall of the tower body 1, wherein the tower body ends of the ... and the tower body ends of the two adjacent tower plates 2 are respectively connected to the inner side walls opposite to A floating plate 31 is provided in the downcomer 3, and a plurality of liquid guide holes are provided on the floating plate 31. A catalyst shell 33 and a plurality of float balls 32 are provided on the floating plate 31. A catalyst 34 is filled in the catalyst shell 33, and a plurality of liquid inlet holes are provided on the surface of the catalyst shell 33. A packing layer 5 is provided at the inner bottom of the tower body 1 below the tower plate 2, and a liquid distributor 4 is provided above the packing layer 5 and above at least one of the tower plates 2, and the liquid distributor 4 is used to introduce the rich liquid of the alcoholamine solution. Specifically, a regeneration gas port and a lean liquid outlet are provided at the top and bottom of the tower body 1, respectively, for discharging the desorbed carbon dioxide gas and the lean liquid of the alcoholamine solution, respectively.

[0022] According to the above technical scheme, based on the carbon dioxide catalytic desorption composite tower, in the actual application process, the desorption temperature of the rich liquid of the alcohol amine solution can be effectively reduced, and the desorption rate can be increased. Specifically, when the operation is stable, the temperature of the carbon dioxide catalytic desorption composite tower presents a linear distribution with high bottom and low top, that is, the temperature of the plate tower section of the tower body 1 located above is slightly lower than the packed tower section of the tower body 1 located below. However, since the desorption catalyst is filled in the catalyst shell of the plate tower section, a large amount of carbon dioxide can still be desorbed at a lower temperature (80-90°C), so the carbon dioxide catalytic desorption composite tower can not only effectively reduce the overall tower temperature (from 105-130°C to below 100°C), reduce the desorption energy consumption, but also increase the desorption rate of carbon dioxide. The reason why the temperature of the carbon dioxide catalytic desorption composite tower presents a linear distribution with high bottom and low top is that the external heating device (such as a reboiler) usually draws a part of the rich liquid of the alcohol amine solution from the bottom of the tower, and returns to the lower position of the tower after steam heating. This arrangement makes the liquid temperature at the bottom of the tower the highest, and the temperature distribution has a trend of high bottom and low top.

[0023] In the carbon dioxide catalytic desorption composite tower of the present invention, preferably, the height of the catalyst 34 loaded in the catalyst housing 33 is 1 / 4 of the total height of the interior of the catalyst housing 33. . By controlling the filling height of the catalyst in the catalyst housing 33, in practical applications, not only can the amount of catalyst used be saved, but also the catalyst can be prevented from filling the catalyst housing and affecting the circulation of the rich alcoholamine solution in the catalyst housing 33, resulting in the rich alcoholamine solution being unable to fully contact the catalyst, thereby affecting the desorption rate of the rich alcoholamine solution. Specifically, the catalyst housing 33 may be, for example, in the shape of a rectangular parallelepiped, with a wire mesh-shaped liquid inlet hole on its surface. Preferably, the aperture of the liquid inlet hole is smaller than the particle size of the catalyst 34, so that the rich alcoholamine solution can quickly enter the catalyst housing 33 to drive the catalyst particles to circulate, and form a micro-circulation reactor with the rich alcoholamine solution (increasing the liquid-solid contact area), while also effectively preventing the catalyst particles from being lost with the rich alcoholamine solution.

[0024] Further preferably, the height of the float 32 is equal to the height of the catalyst housing 33. . By further controlling the height of the float 32, when the carbon dioxide catalytic desorption composite tower is working, there will be a liquid layer of a certain thickness on the tower plate 2, and there will also be a certain liquid level in the downcomer 3. Since the floating plate 31 is connected to the float 32, the floating plate 31 and the catalyst shell 33 will be kept on the surface of the liquid layer in the downcomer 3. At this time, according to the different settings of the float 32, the height of the catalyst shell 33 is always above the liquid level by one-third to one-half. When the rich alcoholamine solution flows downward from the upper tower plate 2, it flows downward along the inner wall of the downcomer 3, directly impacts the assembly composed of the floating plate 31, the float 32 and the catalyst shell 33, and enters the interior of the catalyst shell 33 through the liquid inlet hole on the surface of the catalyst shell 33. The catalyst particles are impacted by the rich alcoholamine solution, and move irregularly in the catalyst shell 33, and are fully in contact with the rich alcoholamine solution, thereby effectively improving the desorption rate of the rich alcoholamine solution. In addition, since the bottom of the catalyst shell 33 connecting to the floating plate 31 is designed to be non-porous, the rich alcoholamine solution can only flow out from the liquid inlet holes around the catalyst shell 33. Compared with the traditional stacked components, the flow rate of the rich alcoholamine solution is reduced, the liquid-solid contact time is prolonged, and the desorption rate of the rich alcoholamine solution is improved.

[0025] In the carbon dioxide catalytic desorption composite tower of the present invention, preferably, the lower liquid outlet of the downcomer 3 is connected to the limited position guide pipe 35. Figure 2 The design of the limit guide pipe 35 shown in the figure can not only prevent the whole body composed of the floating plate 31, the floating ball 32 and the catalyst housing 33 from flowing downward out of the downcomer 3 under the impact of the rich alcoholamine solution, but also guide the rich alcoholamine solution, so as to achieve effective desorption of the rich alcoholamine solution under the action of the upper and lower multi-stage tower plates 2 and the downcomer 3. Among them, the whole body composed of the floating plate 31, the floating ball 32 and the catalyst housing 33 is arranged in the downcomer 3, which can also facilitate installation, maintenance and replacement of the catalyst.

[0026] In the carbon dioxide catalytic desorption composite tower of the present invention, preferably, Figure 2 As shown, a cover plate 22 is provided on the sieve hole 21, and the cover plate 22 is a float valve cover plate or a bubble cover plate. By providing the cover plate 22 on the sieve hole 21, in actual application, the desorbed carbon dioxide gas pushes the cover plate 22 open by its own pressure, and after passing through the sieve hole 21 from bottom to top, when flowing through the liquid layer on the tower plate 2 along the left and right sides, it can fully exchange heat with the liquid, thereby further desorbing the rich alcoholamine solution carried by the gas, and improving the desorption effect on the rich alcoholamine solution.

[0027] In the carbon dioxide catalytic desorption composite tower described in the present invention, in actual application, due to the low load state (such as 30%, 50%, 70% load), the liquid inlet and gas production of the plate tower section located above the tower body 1 will be reduced, resulting in a reduction in the thickness of the liquid layer of the tower plate 2 and a decrease in the mass transfer and heat transfer efficiency. The multiple liquid inlet settings can adjust the liquid inlet of different liquid inlets according to the changes in the system load, reduce the flow rate of the top liquid inlet, avoid the tower efficiency reduction caused by the reduction in the total liquid volume, and reduce the total energy consumption in this state. Therefore, in the present invention, a liquid distributor 4 is further provided at the upper, middle and bottom parts of the tower body 1 for introducing a rich liquid of an alcoholamine solution, so as to facilitate the adjustment of the liquid inlet ratio according to the working conditions. In another specific embodiment, for example, a liquid distributor 4 can be provided above a plurality of the tower plates 2 and the packing layer 5, so that the liquid inlet ratio can be better adjusted according to the working conditions.

[0028] In the carbon dioxide catalytic desorption composite tower of the present invention, the filler in the packing layer 5 can be selected from conventional structured fillers, preferably structured fillers with small tooth top angles, so as to further improve the desorption rate of the rich alcoholamine solution.

[0029] In the carbon dioxide catalytic desorption composite tower of the present invention, preferably, a demister 6 is provided at the inner top of the tower body 1 above the tower plate 2, so as to prevent the desorbed carbon dioxide gas from carrying out more liquid and causing the rich liquid loss of the alcoholamine solution.

[0030] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.

[0031] Example 1 Use Figure 1-2 The carbon dioxide catalytic desorption composite tower shown is implemented for desorption of alcohol amine solution rich liquid. Specifically, the carbon dioxide catalytic desorption composite tower includes a tower body 1, and a plurality of tower plates 2 are arranged from top to bottom inside the tower body 1, and the plurality of tower plates 2 are arranged in parallel in the horizontal direction. One end of the plurality of tower plates 2 is connected to a downcomer 3, and the other end is connected to the inner side wall of the tower body 1, wherein the tower body ends of two adjacent tower plates 2 are respectively connected to the inner side walls opposite to the tower body 1, and a plurality of sieve holes 21 are opened on the tower plate 2, and the non-tower plate end of the downcomer 3 Connected to the inner side wall of the tower body 1, a floating plate 31 is arranged in the downcomer 3, a plurality of liquid guide holes are opened on the floating plate 31, a catalyst housing 33 and a plurality of float balls 32 are arranged on the floating plate 31, a catalyst 34 is filled in the catalyst housing 33, a plurality of liquid inlet holes are opened on the surface of the catalyst housing 33, a packing layer 5 is arranged at the inner bottom of the tower body 1 below the tower plate 2, a liquid distributor 4 is arranged above the packing layer 5 and above at least one of the tower plates 2, and the liquid distributor 4 is used to introduce rich alcoholamine solution; Specifically, a regeneration gas inlet and a lean liquid outlet are respectively provided at the top and bottom of the tower body 1; a demister 6 is provided at the inner top of the tower body 1 above the tower plate 2; the aperture of the liquid inlet is smaller than the particle size of the catalyst 34; the lower liquid outlet of the downcomer 3 is connected to a limited guide tube 35; a cover plate 22 is provided on the sieve hole 21, and the cover plate 22 is a bubble cover plate; and a liquid distributor 4 is provided above a plurality of the tower plates 2.

[0032] In actual application, the rich alcoholamine solution that has absorbed carbon dioxide enters the tower body 1 through three liquid distributors 4 and flows from top to bottom. After being heated and desorbed by the plate tower section and the packed tower section of the tower body 1, carbon dioxide gas is released. The released gas flows out from the regeneration gas port at the top from bottom to top, and the desorbed lean alcoholamine solution flows out from the lean liquid outlet at the bottom of the tower. When the rich alcoholamine solution flows downward from the upper tower plate 2, it flows downward along the inner wall of the downcomer 3, directly impacts the assembly composed of the floating plate 31, the float 32 and the catalyst shell 33, and enters the interior of the catalyst shell 33 through the liquid inlet hole on the surface of the catalyst shell 33. The catalyst particles are impacted by the rich alcoholamine solution, move irregularly in the catalyst shell 33, and are in full contact with the rich alcoholamine solution.

[0033] It has been tested that the carbon dioxide catalytic desorption composite tower described in the present invention effectively reduces the desorption temperature of the rich liquid of the alcoholamine solution, reduces the desorption energy consumption, and improves the desorption rate, thereby effectively reducing the operating cost.

[0034] Example 2 Refer to Example 1, except that the height of the catalyst 34 loaded in the catalyst housing 33 is 1 / 4 of the total height of the catalyst housing 33. The height of the float 32 is the height of the catalyst housing 33. .

[0035] It has been found that the carbon dioxide catalytic desorption composite tower of the present invention can further improve the desorption rate of the rich alcoholamine solution based on the sufficient contact between the catalyst and the rich alcoholamine solution, compared with the solution in Example 1.

[0036] Example 3 Refer to Example 2 for implementation, except that the filler in the packing layer 5 is a filler with regular tooth top angle.

[0037] It has been found that the carbon dioxide catalytic desorption composite tower of the present invention can further improve the desorption rate of the rich alcoholamine solution compared with the solution in Example 2.

[0038] The carbon dioxide catalytic desorption composite tower provided by the present invention is prepared by combining a plate tower and a packed tower, and arranging the plate tower above the packed tower, and further arranging a plurality of tower plates spaced from top to bottom inside the plate tower section where the tower body is located above, wherein the plurality of tower plates are arranged in parallel in the horizontal direction, one end of the plurality of tower plates are connected to a downcomer, and the other end is connected to the inner side wall of the tower body, wherein the tower body ends of two adjacent tower plates are respectively connected to the inner side walls opposite to the tower body, a floating plate is arranged inside the downcomer, a plurality of liquid guide holes are opened on the floating plate, a catalyst shell and a plurality of float balls are arranged on the floating plate, a catalyst is filled in the catalyst shell, and a plurality of liquid inlet holes are opened on the surface of the catalyst shell; a packing layer is arranged at the bottom of the packed tower section where the tower body is located below; and a liquid distributor is arranged above the packing layer and above at least one tower plate, wherein the liquid distributor is used to introduce a rich alcoholamine solution, and in practical application, the desorption temperature of the rich alcoholamine solution can be effectively reduced and the desorption rate can be increased.

[0039] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A carbon dioxide catalytic desorption composite tower, characterized in that: The carbon dioxide catalytic desorption composite tower comprises a tower body (1), wherein a plurality of tower plates (2) are arranged at intervals from top to bottom inside the tower body (1), wherein the plurality of tower plates (2) are arranged in parallel in a horizontal direction, wherein one end of the plurality of tower plates (2) is connected to a downcomer (3), and the other end is connected to the inner side wall of the tower body (1), wherein the tower body ends of two adjacent tower plates (2) are respectively connected to the inner side walls opposite to the tower body (1), wherein the tower plates (2) are provided with a plurality of sieve holes (21), and the non-tower plate end of the downcomer (3) is connected to the inner side wall of the tower body (1), and the downcomer (3) is connected to the inner side wall of the tower body (1). ) is provided with a floating plate (31), the floating plate (31) is provided with a plurality of liquid guide holes, the floating plate (31) is provided with a catalyst shell (33) and a plurality of float balls (32), the catalyst shell (33) is filled with a catalyst (34), the surface of the catalyst shell (33) is provided with a plurality of liquid inlet holes, the inner bottom of the tower body (1) located below the tower plate (2) is provided with a packing layer (5), and a liquid distributor (4) is provided above the packing layer (5) and above at least one of the tower plates (2), and the liquid distributor (4) is used to introduce a rich liquid of an alcohol amine solution.

2. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: The height of the catalyst (34) filled in the catalyst housing (33) is 1 / 3 of the total height of the interior of the catalyst housing (33). .

3. The carbon dioxide catalytic desorption composite tower according to claim 1 or 2, characterized in that: The height of the float (32) is equal to the height of the catalyst housing (33). .

4. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: The diameter of the liquid inlet hole is smaller than the particle diameter of the catalyst (34).

5. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: The lower liquid outlet of the downcomer (3) is connected to a limiting flow guide pipe (35).

6. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: A cover plate (22) is provided on the sieve hole (21), and the cover plate (22) is a float valve cover plate or a bubble cover plate.

7. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: A liquid distributor (4) is arranged above each of the plurality of tower plates (2).

8. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: The filler in the packing layer (5) is a filler with a regular tooth top angle.

9. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: A demister (6) is provided at the inner top of the tower body (1) above the tower plate (2).

10. The carbon dioxide catalytic desorption composite tower according to claim 1, characterized in that: The top and bottom of the tower body (1) are respectively provided with a regeneration gas inlet and a lean liquid outlet.

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