A multi-stage anti-amines liquid escape interception system

Abstract

This application belongs to the field of absorption tower technology and proposes a multi-stage amine liquid escape prevention and interception system, including a spray packing bed, a dry packing bed, and a wire mesh packing bed connected sequentially by a support structure. Through a three-stage interception method, amine droplets, volatile amine vapors, and residual micro-droplets entrained in the gas phase are removed sequentially, thoroughly purifying the vent gas at the top of the tower, preventing amine liquid escape, achieving zero-pollution emissions, reducing amine liquid loss, and lowering operating costs. The upper surface of the spray packing bed is equipped with a spray device, which includes a spray main pipe, spray branch pipes, and spray nozzles. Several arrays of spray branch pipes are arranged on the side of the spray main pipe, and several arrays of spray nozzles are arranged on the side of the spray branch pipes. This enables the spraying of washing liquid, which forms a liquid film on the packing surface. The gas phase and the liquid film are in full contact, and most of the amine droplets entrained in the gas phase are captured by the washing liquid, while the volatile amine vapors are absorbed and dissolved by the washing liquid.

Description

Technical Field

[0001] This application belongs to the field of absorption tower technology, and specifically relates to a multi-stage anti-amine liquid escape interception system. Background Technology

[0002] In CCUS technology, the absorber is a key piece of equipment for carbon dioxide capture, and amine liquid is often used as the absorbent to absorb carbon dioxide from flue gas. However, during the absorption process, the gas phase carries a large number of amine droplets and volatile amine vapors as it rises. If these amine liquids escape with the vented gas at the top of the tower, it will not only cause a large loss of absorbent and increase operating costs, but also pollute the environment, failing to meet environmental protection requirements. Currently, existing technologies for intercepting amine escape primarily consist of single demisters or packing layers, such as wire mesh demisters and baffle demisters. However, these single devices have significant shortcomings: while a single wire mesh demister can remove some droplets, it is less effective at intercepting volatile amine vapors entrained in the gas phase and is easily clogged by amine, affecting its service life and interception efficiency; baffle demisters are ineffective at intercepting smaller micron-sized droplets and are difficult to completely remove them; and a single packing bed can only perform limited washing or dehydration, unable to handle amine droplets and vapors of different states and sizes in the gas phase, resulting in a small amount of amine residue remaining in the vented gas at the top of the tower, making it difficult to achieve zero pollution requirements. Therefore, there is an urgent need for a multi-stage interception system that can efficiently and thoroughly intercept amine droplets and volatile vapors entrained in the gas phase, achieving zero pollution of the gas emitted from the top of the tower, in order to solve the loss and pollution problems caused by amine escape in the existing technology. Summary of the Invention

[0003] To address the aforementioned issues, this application proposes a multi-stage anti-amine liquid escape interception system, comprising a spray packing bed, a dry packing bed, and a wire mesh packing bed connected sequentially by a support structure. A spraying device is installed on the upper surface of the sprayed packing bed, and the spraying device is located between the sprayed packing bed and the dry packing bed. The spraying device includes a spraying main pipe, spraying branch pipes and spraying nozzles. Several arrays of spraying branch pipes are installed on the side of the spraying main pipe, and several arrays of spraying nozzles are installed on the side of the spraying branch pipes.

[0004] Furthermore, the spray packing bed includes a first airflow distribution plate, a first Pall ring, and a stepped ring arranged in sequence, with a spraying device provided on the side of the first airflow distribution plate away from the first Pall ring.

[0005] Furthermore, the packing materials for both the first Pall ring and the step ring are made of materials resistant to amine liquid corrosion.

[0006] Furthermore, the materials resistant to amine liquid corrosion are polypropylene or 316L stainless steel.

[0007] Furthermore, the dry bed packing layer includes a second airflow distribution plate, a second Pall ring, and a third airflow distribution plate connected in sequence, with the second airflow distribution plate located on the side of the second Pall ring closer to the spray packing layer.

[0008] Furthermore, the second Pall ring is filled with dry bed packing.

[0009] Furthermore, the wire mesh packing bed is internally equipped with wire mesh.

[0010] Furthermore, the wire mesh is made of high-strength and corrosion-resistant metal or plastic wire mesh.

[0011] Furthermore, the wire mesh is made of stainless steel or polypropylene.

[0012] Furthermore, the support structure includes a first support structure and a second support structure. The first support structure is installed between the spray packing bed and the dry packing bed, and the second support structure is installed between the dry packing bed and the wire mesh packing bed.

[0013] Beneficial effects of this invention: 1. The multi-stage amine liquid escape prevention and interception system of the present invention includes a spray packing bed, a dry packing bed, and a wire mesh packing bed connected in sequence by a support structure; through a three-stage interception method, amine liquid droplets, volatile amine vapors and residual tiny droplets entrained in the gas phase are removed in sequence, thoroughly purifying the gas vented at the top of the tower, preventing amine liquid escape, achieving zero pollution emissions, while reducing amine liquid loss and lowering operating costs.

[0014] 2. The multi-stage amine liquid escape interception system of the present invention has a spraying device installed on the upper surface of the spraying packing bed, which is located between the spraying packing bed and the dry packing bed. The spraying device includes a spraying main pipe, spraying branch pipes, and spraying nozzles. Several arrays of spraying branch pipes are installed on the side of the spraying main pipe, and several arrays of spraying nozzles are installed on the side of the spraying branch pipes. When the gas phase carrying amine droplets from the absorption section enters the spraying packing bed, the washing liquid in the spraying main pipe of the spraying device enters the spraying branch pipes and then flows out through the spraying nozzles, thereby realizing the spraying of washing liquid. The washing liquid forms a liquid film on the packing surface. The gas phase and the liquid film are in full contact, and most of the amine droplets carried in the gas phase are captured by the washing liquid. At the same time, the volatile amine vapor is absorbed and dissolved by the washing liquid.

[0015] 3. The dry bed packing layer of the multi-stage amine liquid escape interception system of the present invention includes a second airflow distribution plate, a second Pall ring, and a third airflow distribution plate connected in sequence. The second airflow distribution plate is located on the side of the second Pall ring close to the spray packing layer. When the gas phase carrying amine droplets from the absorption section exits the spray packing layer, it enters the second airflow distribution plate, the second Pall ring, and the third airflow distribution plate in sequence, thereby realizing the secondary interception of the amine liquid. The second Pall ring is filled with dry bed packing.

[0016] Other features and advantages of this application will be set forth in the following description 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 and the accompanying 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 multi-stage anti-amine liquid escape interception system in an embodiment of this application is shown.

[0019] Figure 2 A schematic diagram of the spray device of the multi-stage anti-amine liquid escape interception system in an embodiment of this application is shown.

[0020] Explanation of reference numerals in the attached drawings: 10. Spray packing bed; 11. Spray device; 111. Spray main pipe; 112. Spray branch pipe; 113. Spray nozzle; 12. First Pall ring; 13. Stepped ring; 14. First airflow distribution plate; 20. Dry bed packing bed; 21. Second airflow distribution plate; 22. Second Pall ring; 23. Third airflow distribution plate; 30. Wire mesh packing bed; 31. Wire mesh; 41. First support structure; 42. Second support structure. Detailed Implementation

[0021] 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.

[0022] Example 1 The multi-stage anti-amine liquid escape interception system for CCUS absorption towers of the present invention is installed at the top outlet of the CCUS absorption tower. It mainly consists of a spray packing bed 10, a dry packing bed 20, a wire mesh packing bed 30, and corresponding supporting components, connecting components, and auxiliary components. The specific structure and working method are as follows: The spray packing bed 10 is located at the bottom of the interception system and is connected to the outlet of the absorption section of the absorption tower. This bed is filled with multiple layers of high-efficiency spray packing, such as first Pall rings 12 and stepped rings 13. The packing material for the first Pall rings 12 and stepped rings 13 is selected to be resistant to amine liquid corrosion, such as polypropylene or 316L stainless steel. A spraying device 11 is installed above the spray packing bed 10. The spraying device 11 includes a main spray pipe 111, branch spray pipes 112, and spray nozzles 113. The spraying device 11 is connected to an external washing liquid supply system. The washing liquid is demineralized water (selected according to actual conditions; if water is used, the subsequent amine-containing liquid can be used to replenish the absorption system). When the gas phase carrying amine droplets from the absorption section enters the spray-packed bed 10, the spray device 11 sprays washing liquid onto the packing bed (first Pall ring 12 and stepped ring 13), forming a liquid film on the packing surface. The gas phase and liquid film are in full contact, and most of the amine droplets entrained in the gas phase are captured by the washing liquid, while volatile amine vapors are absorbed and dissolved by the washing liquid. During the purification process, the washing liquid may carry a small amount of water droplets, and these droplets contain a small amount of residual amine liquid. These mixtures are collected through an internal collection tank at the bottom of the bed and can be returned to the absorption section of the absorption tower or subjected to further treatment. The dry bed packing layer 20 is positioned above the spray packing layer 10 and separated from it by airflow distribution plates (first airflow distribution plate 14 and second airflow distribution plate 21). The airflow distribution plates ensure uniform gas phase entry into the dry bed packing layer 20. The dry bed packing layer 20 is filled with dry bed packing materials, such as second Pall rings 22 and structured packing, and the packing material is also selected as corrosion-resistant. The surface of the dry bed packing layer 20 has a large specific surface area and good wettability, enabling it to adsorb liquid droplets entrained in the gas phase. After being treated by the spray packing bed 10, the gas phase enters the dry packing bed 20. As the gas phase passes through the second Pall ring 22, it comes into contact with the packing surface. Most of the water droplets (including a small amount of residual amine liquid) in the gas phase are adsorbed and retained by the packing, achieving secondary dehydration and purification, and further removing liquid droplets from the gas phase. The retained liquid is collected through the guide channel at the bottom of the bed and flows into the collection tank.

[0023] The wire mesh packing bed 30 is located at the top of the interception system and is connected to the dry bed packing bed 20. This bed is filled with wire mesh 31, which is made of high-strength, corrosion-resistant metal or plastic wire mesh, such as stainless steel wire mesh or polypropylene wire mesh. The pores formed by the wire mesh 31 are small and uniform.

[0024] After the secondary treatment, a very small amount of micron-sized droplets still remain in the gas phase. These droplets enter the tertiary wire mesh packing bed 30 with the gas phase. When the gas phase passes through the wire mesh packing, the micron-sized droplets collide with the wire mesh surface, are intercepted by the wire mesh and aggregate into larger droplets, and drip down to the liquid collection device below under the action of gravity, realizing three-stage demisting and deliquescence to fully remove the remaining micron-sized droplets. Auxiliary components include support structures (first support structure 41 and second support structure 42), airflow distribution devices, and liquid collection and reflux systems. The support structures (first support structure 41 and second support structure 42) are used to fix the various levels of the packed bed, ensuring its stability during operation. The airflow distribution devices (such as airflow distribution plates and guide vanes, not shown in the figure) ensure uniform gas flow through each level of the bed, improving interception efficiency. The liquid collection and reflux system, composed of a collection tank, guide pipes, valves, etc., is used to collect the liquid intercepted by each level of the bed and reflux it back to the absorption tower or transport it to the treatment unit as needed. The entire interception system operates as follows: the gas phase carrying amine droplets from the absorption section first enters the spray packing bed 10, where it is washed by the spray device 11 to remove most of the amine droplets and volatile amine vapors; then it enters the dry packing bed 20 to remove most of the water droplets and residual amine liquid; finally, it enters the wire mesh packing bed 30 to completely remove the remaining micron-sized droplets. The purified exhaust gas from the top of the tower is discharged from the outlet above the three-stage bed, achieving the requirement of zero pollution emissions.

[0025] Example 2 refer to Figure 1 A multi-stage anti-amine liquid escape interception system includes a spray packing bed 10, a dry packing bed 20, and a wire mesh packing bed 30 connected sequentially by a support structure. (Reference) Figure 2 A spraying device 11 is provided on the upper surface of the sprayed packing bed 10, located between the sprayed packing bed 10 and the dry packing bed 20. The spraying device 11 includes a spraying main pipe 111, spraying branch pipes 112, and spraying nozzles 113. Several arrays of spraying branch pipes 112 are provided on the side of the spraying main pipe 111, and several arrays of spraying nozzles 113 are provided on the side of the spraying branch pipes 112. When the gas phase carrying amine droplets from the absorption section enters the sprayed packing bed 10, the washing liquid in the spraying main pipe 111 of the spraying device 11 enters the spraying branch pipes 112 and then flows out through the spraying nozzles 113, thereby achieving the spraying of washing liquid. The washing liquid forms a liquid film on the packing surface. The gas phase and the liquid film are in full contact, and most of the amine droplets carried in the gas phase are captured by the washing liquid, while the volatile amine vapor is absorbed and dissolved by the washing liquid.

[0026] This invention uses a three-stage interception method to sequentially remove amine droplets, volatile amine vapors, and residual tiny droplets entrained in the gas phase, thoroughly purifying the vented gas at the top of the tower, preventing amine escape, achieving zero-pollution emissions, reducing amine loss, and lowering operating costs.

[0027] Furthermore, the spray packing bed 10 includes a first airflow distribution plate 14, a first Pall ring 12, and a stepped ring 13 arranged sequentially. A spraying device 11 is provided on the side of the first airflow distribution plate 14 away from the first Pall ring 12. When the gas phase carrying amine droplets from the absorption section enters the stepped ring 13, the first Pall ring 12, and the first airflow distribution plate 14 sequentially, the amine liquid is intercepted.

[0028] Furthermore, the packing material for both the first Pall ring 12 and the step ring 13 is selected from materials resistant to amine liquid corrosion, thereby improving service life. The amine-resistant materials are polypropylene or 316L stainless steel. This further extends the service life of the device and facilitates cleaning.

[0029] refer to Figure 1 The dry bed packing layer 20 includes a second airflow distribution plate 21, a second Pall ring 22, and a third airflow distribution plate 23 connected in sequence. The second airflow distribution plate 21 is located on the side of the second Pall ring 22 closest to the spray packing layer 10. When the gas phase carrying amine droplets from the absorption section exits the spray packing layer 10, it sequentially enters the second airflow distribution plate 21, the second Pall ring 22, and the third airflow distribution plate 23, thereby achieving secondary interception of the amine liquid. The second Pall ring 22 is filled with dry bed packing. This achieves the drying of the gas phase while simultaneously performing secondary interception of the amine liquid.

[0030] refer to Figure 1 The wire mesh packing bed 30 has a wire mesh 31 inside. By incorporating the wire mesh 31, a third layer of amine liquid barrier is achieved. The wire mesh 31 is made of high-strength, corrosion-resistant metal or plastic wire mesh, thus extending the service life of the wire mesh packing bed 30. Furthermore, the wire mesh 31 can be made of stainless steel or polypropylene wire mesh, further enhancing the service life of the wire mesh packing bed 30.

[0031] refer to Figure 1 The support structure includes a first support structure 41 and a second support structure 42. The first support structure 41 is installed between the spray packing bed 10 and the dry packing bed 20, and the second support structure 42 is installed between the dry packing bed 20 and the wire mesh packing bed 30. The sequential connection of the spray packing bed 10, the dry packing bed 20, and the wire mesh packing bed 30 is achieved by setting the first support structure 41 and the second support structure 42.

[0032] This invention employs a three-stage interception system. The spray-packed bed 10 removes 70% to 80% of amine droplets and volatile amine vapors from the gas phase; the dry-bed packed bed 20 further removes 85% to 90% of the remaining droplets; and the wire mesh packed bed 30 removes over 99% of micron-sized droplets. Through the synergistic effect of these three stages, the amine content in the vented gas at the top of the tower can be reduced to below 1 ppm, thoroughly purifying the gas and achieving zero-pollution emissions. By utilizing the multi-stage interception of the spray-packed bed 10, dry-bed packed bed 20, and wire mesh packed bed 30, the amine entrained in the gas phase is recovered to the maximum extent, reducing amine loss by over 90%, significantly decreasing the amount of absorbent replenishment, and lowering operating costs. This invention can adapt to different working conditions. Specifically, the three-stage bed can be flexibly adjusted according to different working conditions such as the content and size of amine droplets in the gas phase. For example, the flow rate of the washing liquid in the first-stage spray can be adjusted, and different specifications of packing materials can be replaced to ensure that a good interception effect can be maintained under various working conditions. This invention is stable in operation and easy to maintain: the bed structure of each level of packing is simple, and the selected corrosion-resistant materials ensure a long service life; the system's liquid collection and reflux system is reasonably designed, which can promptly discharge the trapped liquid and avoid bed blockage; daily maintenance mainly includes periodically checking the integrity of the packing and cleaning the spray device 11, etc., which is easy to operate. This invention has strong compatibility: the multi-stage interception system can be used with various types of CCUS absorption towers and installed at the top outlet of the tower. It does not require major modifications to the main structure of the absorption tower and has good compatibility and versatility.

[0033] 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 multi-stage anti-amine liquid escape interception system, characterized in that, It includes a spray packing bed (10), a dry packing bed (20) and a wire mesh packing bed (30) connected in sequence by a support structure; A spraying device (11) is provided on the upper surface of the spraying packing bed (10), and the spraying device (11) is located between the spraying packing bed (10) and the dry bed packing bed (20). The spraying device (11) includes a spraying main pipe (111), spraying branch pipes (112) and spraying nozzles (113). A plurality of arrays of spraying branch pipes (112) are provided on the side of the spraying main pipe (111), and a plurality of arrays of spraying nozzles (113) are provided on the side of the spraying branch pipes (112).

2. The multi-stage anti-amine liquid escape interception system according to claim 1, characterized in that, The spray packing bed (10) includes a first airflow distribution plate (14), a first Pall ring (12) and a stepped ring (13) arranged in sequence. A spraying device (11) is provided on the side of the first airflow distribution plate (14) away from the first Pall ring (12).

3. The multi-stage anti-amine liquid escape interception system according to claim 2, characterized in that, The filler material of the first Pall ring (12) and the step ring (13) is a material resistant to amine liquid corrosion.

4. The multi-stage anti-amine liquid escape interception system according to claim 3, characterized in that, The material resistant to amine liquid corrosion is polypropylene or 316L stainless steel.

5. The multi-stage anti-amine liquid escape interception system according to claim 1, characterized in that, The dry bed packing bed (20) includes a second airflow distribution plate (21), a second Pall ring (22) and a third airflow distribution plate (23) connected in sequence. The second airflow distribution plate (21) is located on the side of the second Pall ring (22) close to the spray packing bed (10).

6. The multi-stage anti-amine liquid escape interception system according to claim 5, characterized in that, The second Pall ring (22) is filled with dry bed packing.

7. The multi-stage anti-amine liquid escape interception system according to claim 1, characterized in that, The wire mesh packing bed (30) is provided with wire mesh (31) inside.

8. The multi-stage anti-amine liquid escape interception system according to claim 7, characterized in that, The wire mesh (31) is made of high-strength and corrosion-resistant metal or plastic wire mesh.

9. A multi-stage anti-amine liquid escape interception system according to claim 8, characterized in that, The wire mesh (31) is a stainless steel wire mesh or a polypropylene wire mesh.

10. A multi-stage anti-amine liquid escape interception system according to claim 1, characterized in that, The support structure includes a first support structure (41) and a second support structure (42). The first support structure (41) is installed between the spray packing bed (10) and the dry packing bed (20), and the second support structure (42) is installed between the dry packing bed (20) and the wire mesh packing bed (30).

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