A wire mesh mist eliminator for a CCUS absorption tower

Abstract

The application discloses a wire mesh demister for a CCUS absorption tower, and belongs to the technical field of carbon absorption. The demister comprises a frame member, a wire mesh assembly and a support structure. The wire mesh assembly comprises an upper wire mesh and a lower wire mesh with different porosities. Through the differential porosity design of the upper wire mesh and the lower wire mesh, the lower wire mesh is used for capturing large-diameter droplets, and the upper wire mesh is used for capturing small-diameter droplets. The two-stage wire mesh synergistically acts, can improve the capture efficiency of droplets, improve the purification degree of the tower top vent gas, and simultaneously, the lower wire mesh has large porosity and small gas flow resistance, can quickly process a large amount of large-diameter droplets, avoids poor air flow, can reduce the load of the upper wire mesh, and makes the gas flow resistance of the whole demister controlled within a set range.

Description

Technical Field

[0001] This application belongs to the field of carbon absorption technology, and specifically relates to a wire mesh demister for a CCUS absorption tower. Background Technology

[0002] In large-scale CCUS (Carbon Capture, Utilization and Storage) projects, square absorption towers are widely used in the carbon dioxide absorption and capture process due to their advantages such as high space utilization and ease of modular design and scaling. During tower operation, after the absorbent, such as amine liquid, comes into full contact with the carbon dioxide-containing flue gas, the gas phase carries a large number of droplets as it rises to the top of the tower. These droplets contain a certain amount of absorbent, such as amine liquid. If not effectively treated, these droplets are discharged with the vented gas at the top of the tower, causing significant absorbent loss and increasing operating costs. Furthermore, the release of substances like amine liquid into the environment causes pollution, failing to meet environmental protection requirements. In addition, droplets entering subsequent equipment can lead to corrosion and blockage, affecting the stable operation of the entire CCUS system.

[0003] Currently, the existing demisters have a single-layer wire mesh structure with a fixed porosity, making it difficult to achieve efficient capture of droplets of different sizes. They either have low capture efficiency for small droplets or are prone to excessive resistance due to excessively small porosity, which can lead to secondary flooding. This fails to meet the high requirements of large CCUS square absorption towers for droplet capture efficiency and system stability. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a wire mesh demister for CCUS absorption towers, thereby resolving the technical issues raised in the background art.

[0005] A wire mesh demister for a CCUS absorber tower includes: Frame components, installed at the top of the tower; A wire mesh assembly is assembled within the frame member and includes a lower wire mesh and an upper wire mesh disposed above the lower wire mesh. The lower wire mesh has a porosity of 60% to 70% and a mesh size of 1 to 2 mm. The upper wire mesh has a porosity of 40% to 50% and a mesh size of 0.5 to 1 mm. A supporting structure is provided at the bottom end of the frame component.

[0006] Furthermore, the height of both the upper and lower wire mesh is 145–155 mm.

[0007] Furthermore, the wire diameter of both the lower and upper wire mesh is 0.12–0.2 mm.

[0008] Furthermore, the support structure includes a support ring fixed to the bottom end of the frame member and a plurality of first support beams fixed to the bottom end of the support ring and spaced apart in a second direction, wherein the first support beams extend along the first direction.

[0009] Furthermore, the first support beam includes: The main body has an end section connected to the support ring body and a middle section located on the lower side of the wire mesh assembly; The support portion extends from the intermediate section toward the wire mesh assembly and contacts the bottom surface of the wire mesh assembly.

[0010] Furthermore, the support structure also includes a plurality of second support beams spaced apart in the first direction and connected to the first support beam, wherein the second support beams include: The first beam extends along the second direction and contacts the bottom surface of the wire mesh assembly; The second beam is located below the first beam and is connected to the first beam via multiple connecting rods.

[0011] Furthermore, both the upper and lower wire meshes are formed by splicing together multiple wire mesh units.

[0012] Furthermore, the demister also includes a cap structure disposed at the top of the wire mesh assembly. The cap structure includes a plurality of first rods extending along a first direction and a plurality of second rods extending along a second direction. The first rods and the second rods are arranged in an alternating manner and connected to each other at the intersection to form a plurality of mesh units.

[0013] Furthermore, the width of the frame component is 50-100mm.

[0014] Furthermore, both the upper and lower wire meshes are made of metal.

[0015] Compared with the prior art, this application has the following advantages: This application utilizes a differentiated porosity design for the upper and lower wire meshes. The lower wire mesh targets large-diameter droplets, while the upper wire mesh targets small-diameter droplets. The synergistic effect of the two wire meshes improves droplet capture efficiency and enhances the purification level of the vented gas at the top of the tower. Simultaneously, the lower wire mesh has a higher porosity and lower gas flow resistance, enabling rapid processing of large quantities of large-diameter droplets and preventing airflow obstruction. It also reduces the load on the upper wire mesh, keeping the gas flow resistance of the entire demister within a set range.

[0016] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the demister of this application is shown; Figure 2 A partial schematic diagram of the demister of this application is shown.

[0019] In the picture: 10. Frame components; 20. Wire mesh assembly; 20a. Wire mesh unit; 200. Upper wire mesh; 201. Lower wire mesh; 30. First support beam; 300. Main body; 301. Supporting part; 40. Second support beam; 400. First beam; 401. Second beam; 402. Connecting rod; 50. Support ring body; 60. Pressure cap structure; 600. First member; 601. Second member. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] A wire mesh demister for a CCUS absorber tower (hereinafter referred to as the demister), with reference to Figure 1The main body consists of a frame component 10, a wire mesh assembly 20, and a support structure. The frame component 10 serves as the overall support structure for the demister. For ease of description, this application uses the frame component 10 as a reference for positional description, and the length and width directions of the frame component 10 are respectively referred to as the first direction and the second direction. Descriptions of the top (side), bottom (side), and height are based on the height direction of the frame component 10. In some examples, the frame component 10 is made of carbon steel or stainless steel, and its dimensions match the cross-sectional dimensions of the top of the absorption tower (e.g., a square absorption tower), effectively covering the entire tower cross-section. This avoids the blind spots in corner demisting that occur when a circular demister is installed in a square tower, ensuring that all droplets in the top area of ​​the tower can be effectively captured, thus improving the overall demisting effect. Furthermore, the frame width and thickness of the frame component 10 are designed for strength based on the size and operating pressure of the absorption tower. For example, the frame width of the frame component 10 is 50–100 mm, and the thickness of the frame component 10 is 8–12 mm. Reference Figure 1 The aforementioned wire mesh assembly 20 is disposed within the frame member 10 and is fixed within the frame member 10 by means of, for example, snap-fit ​​or screw-fit. For example, the frame member 10 is provided with a slot and a threaded hole for mounting and fixing the wire mesh assembly 20. Specifically, the shape of the aforementioned wire mesh assembly 20 is adapted to the square frame, that is, the size of the wire mesh assembly 20 is determined based on the size of the frame member 10, for example, 1000 to 2000 mm.

[0022] In some embodiments, the wire mesh assembly 20 is composed of a lower wire mesh 201 and an upper wire mesh 200. Both the upper wire mesh 200 and the lower wire mesh 201 are made of, for example, metal or high-strength plastic materials; that is, both the upper wire mesh 200 and the lower wire mesh 201 are metal wire mesh or high-strength plastic wire mesh. Specifically, both the upper wire mesh 200 and the lower wire mesh 201 are formed by stacking multiple single-layer wire meshes. The multiple layers of wire mesh are fixed together as a whole by binding and extruding with stainless steel wire to form the upper wire mesh 200 and the lower wire mesh 201. In some examples, the heights of the lower wire mesh 201 and the upper wire mesh 200 are both 145–155 mm. Specifically, the porosity of the lower wire mesh 201 is 60%–70%, the wire diameter is 0.12–0.2 mm, and the mesh size is 1–2 mm. The lower wire mesh 201 can capture vapor droplets with a particle size greater than 15 μm. When the vapor phase carrying droplets flows through the lower wire mesh 201, the larger droplets will collide with the wire mesh surface, be intercepted and aggregate into larger droplets, and fall under the action of gravity. Correspondingly, the upper wire mesh 200 has a porosity of 40%–50%, a wire diameter of 0.12–0.2 mm, and a mesh size of 0.5–1 mm. It is primarily used to capture droplets with a diameter greater than 9 μm remaining after treatment by the lower wire mesh 201. When the gas phase passes through the upper wire mesh 200, small-diameter droplets make full contact with the mesh surface and are trapped, further purifying the gas. This results in high capture efficiency. Through the differentiated porosity design of the upper and lower wire meshes 200, the lower mesh 201 targets large-diameter droplets, while the upper mesh 200 targets small-diameter droplets. The synergistic effect of the two meshes achieves a total droplet capture efficiency of over 99%, with a capture efficiency exceeding 99.5% for droplets larger than 15 μm and over 99% for droplets of 9 μm, significantly improving efficiency. This design improves the purification level of the vented gas at the top of the tower. The lower wire mesh 201 has a high porosity and low gas flow resistance, enabling rapid processing of large-diameter droplets and preventing airflow obstruction. Although the upper wire mesh 200 has a low porosity, the droplet content in the gas phase is significantly reduced after pretreatment by the lower wire mesh 201, preventing overloading of the upper wire mesh 200. This allows the gas flow resistance of the entire demister to be controlled within the range of 50–100 Pa, far lower than that of traditional single-wire demisters, effectively preventing secondary flooding and ensuring stable operation of the absorption tower. Furthermore, the highly efficient droplet capture capability enables full recovery of absorbents such as amine liquid in the gas phase, reducing absorbent loss by over 90%, decreasing absorbent replenishment, significantly lowering the operating cost of the CCUS system, and avoiding environmental pollution caused by absorbent emissions.

[0023] In some embodiments, both the upper wire mesh and the lower wire mesh 201 are formed by splicing together multiple wire mesh units 20a to form a modular wire mesh structure design.

[0024] Reference Figure 1The aforementioned demister also includes a cap structure 60 at the top of the wire mesh assembly 20. The cap structure 60 is a grid structure. Specifically, the cap structure 60 includes a plurality of first rods 600 extending along a first direction and a plurality of second rods 601 extending along a second direction. The first rods 600 and the second rods 601 are arranged in an alternating manner and connected to each other at the intersection to form a plurality of grid units. The first direction is approximately perpendicular to the second direction. The first rods 600 and the second rods 601 are distributed at equal intervals. The first rods 600 and / or the second rods 601 at the edge of the grid structure extend beyond the boundary of the grid unit.

[0025] Reference Figure 2 The aforementioned support structure includes a support ring 50 fixed to the bottom of the frame member 10 by means such as welding. The support ring 50 extends along the frame member 10, meaning that the shape of the support ring 50 is the same as that of the frame member 10. Correspondingly, the aforementioned support structure also includes a beam structure. In some embodiments, the beam structure includes a plurality of first support beams 30 fixed to the bottom of the support ring 50 and extending along a first direction, and the plurality of first support beams 30 are spaced apart in a second direction. Specifically, the first support beam 30 includes a main body 300 and a support portion 301, wherein the main body 300 has an end section that contacts the bottom of the support ring 50 and a middle section located below the wire mesh assembly 20. Correspondingly, the support portion 301 is formed by extending from the middle section of the main body 300 toward the wire mesh assembly 20. Continuing to refer to... Figure 2 The aforementioned beam structure also includes multiple second support beams 40 extending along the second direction and connected to the first support beam 30. Specifically, the second support beam 40 includes a first beam 400 in contact with the bottom end of the wire mesh assembly 20, a second beam 401 located below the first beam 400, and multiple connecting rods 402 connecting the first beam 400 and the second beam 401. Based on the supporting role of the first beam 400 and the support portion 301 in the first support beam 30, the wire mesh assembly 20 can be prevented from collapsing under pressure, that is, the wire mesh assembly 20 can be prevented from deforming and being damaged under the impact of airflow. At the same time, an area for arranging liquid guide pipes is formed between adjacent second support beams 40 to facilitate the discharge of droplets formed by the accumulation of droplets after being intercepted by the wire mesh assembly 20.

[0026] The working process of the demister of the present invention is as follows: the gas phase carrying mist droplets rises from the bottom of the CCUS absorption tower to the top of the tower, and first enters the lower wire mesh 201. Mist droplets with a particle size greater than 15μm collide with the surface of the wire mesh and are intercepted, agglomerated into larger droplets and fall under the action of gravity. The gas phase that has been preliminarily purified continues to rise and enters the upper wire mesh 200. Mist droplets with a particle size greater than 9μm come into full contact with the surface of the wire mesh and are intercepted. A very small number of tiny mist droplets are also further removed in this process. The purified gas is discharged from the top of the demister, and the intercepted liquid containing absorbent is returned to the absorption tower through the liquid guide pipe, completing the entire process of mist capture and absorbent recovery.

[0027] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A wire mesh demister for a CCUS absorption tower, characterized in that, include: Frame component (10) is installed on the top of the tower body; The wire mesh assembly (20) is assembled within the frame member (10) and includes a lower wire mesh (201) and an upper wire mesh (200) disposed on the upper side of the lower wire mesh (201). The porosity of the lower wire mesh (201) is 60% to 70% and the mesh size of the lower wire mesh (201) is 1 to 2 mm. The porosity of the upper wire mesh (200) is 40% to 50% and the mesh size of the upper wire mesh (200) is 0.5 to 1 mm. A supporting structure is provided at the bottom end of the frame member (10).

2. The wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, The height of both the upper wire mesh (200) and the lower wire mesh (201) is 145-155 mm.

3. The wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, The wire diameter of both the lower wire mesh (201) and the upper wire mesh (200) is 0.12 to 0.2 mm.

4. A wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, The support structure includes a support ring (50) fixed to the bottom end of the frame member (10) and a plurality of first support beams (30) fixed to the bottom end of the support ring (50) and spaced apart in a second direction, wherein the first support beams (30) extend along the first direction.

5. A wire mesh demister for a CCUS absorption tower according to claim 4, characterized in that, The first support beam (30) includes: The main body (300) has an end section connected to the support ring (50) and a middle section located on the underside of the wire mesh assembly (20); The support portion (301) extends from the intermediate section toward the wire mesh assembly (20) and contacts the bottom surface of the wire mesh assembly (20).

6. A wire mesh demister for a CCUS absorption tower according to claim 5, characterized in that, The support structure further includes a plurality of second support beams (40) spaced apart in a first direction and connected to the first support beam (30), wherein the second support beams (40) include: The first beam (400) extends along the second direction and contacts the bottom surface of the wire mesh assembly (20); The second beam (401) is located below the first beam (400) and is connected to the first beam (400) by a plurality of connecting rods (402).

7. A wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, Both the upper wire mesh (200) and the lower wire mesh (201) are formed by splicing together multiple wire mesh units (20a).

8. A wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, The demister also includes a cap structure (60) disposed at the top of the wire mesh assembly (20). The cap structure (60) includes a plurality of first rods (600) extending along a first direction and a plurality of second rods (601) extending along a second direction. The first rods (600) and the second rods (601) are arranged in an alternating manner and connected to each other at the intersection to form a plurality of grid units.

9. A wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, The frame member (10) has a border width of 50-100mm.

10. A wire mesh demister for a CCUS absorption tower according to claim 1, characterized in that, Both the upper wire mesh (200) and the lower wire mesh (201) are made of metal.

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