Ammonia absorption tower top composite demister

Abstract

This utility model relates to the field of ammonia demisting technology, and discloses a composite demister at the top of an ammonia absorption tower. It includes an absorption tower shell, a support shell a fixedly connected inside the absorption tower shell, a baffle plate demister fixedly connected inside the support shell a, the baffle plate demister having a 60-degree bend angle, a large-pore stainless steel wire mesh layer slidably connected to the top of the baffle plate demister, a small-pore stainless steel wire mesh layer slidably connected to the top of the large-pore stainless steel wire mesh layer, and a high-efficiency fiber demister slidably connected to the top of the small-pore stainless steel wire mesh layer. In this utility model, larger droplets collide with the baffle plate and separate, achieving initial demisting. When the airflow passes through the wire mesh, the droplets are captured by the wire mesh for further demisting. When tiny droplets pass through the fiber demister with the airflow, the droplets are captured and agglomerated by the fibers, forming larger droplets that flow down, thereby preventing the waste gas tower liquid level from dropping, improving treatment efficiency, and preventing ammonia escape exceeding the standard.

Description

Technical Field

[0001] This utility model relates to the field of ammonia demisting technology, and in particular to a composite demister at the top of an ammonia absorption tower. Background Technology

[0002] The ammonia absorption tower top composite demister is a multi-layer demister device installed at the top of the ammonia absorption tower. It removes liquid droplets or foam entrained in the gas through physical interception and inertial collision, preventing liquid carryover in the gas, improving gas purity, and protecting downstream equipment.

[0003] In existing technologies, the composite demister at the top of the ammonia absorption tower uses a wire mesh or baffle structure to intercept liquid droplets or mist entrained in the gas through inertial collision, gravity settling, and capillary action. The liquid droplets adhere to the surface of the wire mesh or baffle and accumulate into large droplets before falling back, thereby efficiently separating gas and liquid, reducing liquid carryover in the gas, and protecting downstream equipment.

[0004] However, in the existing technology, when some ammonia absorption towers are running, the droplets carried by the airflow at the top of the tower are easily carried into the tail gas emission tower with the exhaust gas, which leads to a drop in the liquid level of the exhaust gas tower and a decrease in treatment efficiency. At the same time, it causes ammonia escape to exceed the standard. To solve the above problems, a composite demister at the top of the ammonia absorption tower is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a composite demister at the top of an ammonia absorption tower, which aims to improve the problem in the prior art where droplets carried by the airflow at the top of the tower easily enter the downstream tail gas emission tower with the exhaust gas, causing the liquid level of the exhaust gas tower to drop.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a composite demister at the top of an ammonia absorption tower, comprising an absorption tower shell, a support shell a fixedly connected inside the absorption tower shell, a baffle plate demister fixedly connected inside the support shell a, the baffle plate demister having a 60-degree bend angle, a large-hole stainless steel wire mesh layer slidably connected to the top of the baffle plate demister, a small-hole stainless steel wire mesh layer slidably connected to the top of the large-hole stainless steel wire mesh layer, and a high-efficiency fiber demister slidably connected to the top of the small-hole stainless steel wire mesh layer, the high-efficiency fiber demister having a fiber diameter of 5μm and a surface coated with a hydrophobic fluoride coating;

[0007] As a further description of the above technical solution: the outer side of the large-hole stainless steel wire mesh layer is fixed inside the support shell a, the outer side of the small-hole stainless steel wire mesh layer is fixed inside the support shell a, and the outer side of the high-efficiency fiber demister is fixed outside the support shell a.

[0008] As a further description of the above technical solution: multiple support plates a are fixedly connected inside the outer shell of the absorption tower, and support columns a are fixedly connected inside the multiple support plates a. A motor a is fixedly connected to the top of the support column a.

[0009] As a further description of the above technical solution: the driving end of the motor a is fixedly connected to a driving column a, the bottom of the driving column a is fixedly connected to a scraper, and the bottom of the scraper is slidably connected to the top of the high-efficiency fiber demister.

[0010] As a further description of the above technical solution: a water spray pipe is fixedly connected inside the outer shell of the absorption tower, and the water spray pipe is arranged above the high-efficiency fiber demister;

[0011] As a further description of the above technical solution: multiple support plates c are fixedly connected inside the outer shell of the absorption tower, support columns b are fixedly connected to the outside of the multiple support plates c, a motor b is fixedly connected to the top of the support column b, a drive column b is fixedly connected to the drive end of the motor b, and a rotating plate is fixedly connected to the outside of the drive column b.

[0012] As a further description of the above technical solution: a telescopic drainage cloth is fixedly connected to the outside of the rotating plate, a support plate b is fixedly connected to the outside of the telescopic drainage cloth, a support shell b is fixedly connected to the outside of the support plate b, the outside of the support plate b is fixedly connected to the inside of the absorption tower shell, the outside of the support plate b is fixedly connected to the outside of the support column b, the outside of the support plate b is slidably connected to the outside of the rotating plate, a drainage hole is provided inside the telescopic drainage cloth, a drainage pipe is fixedly connected to the inside of the absorption tower shell, and the drainage pipe is located at the bottom of the drainage hole.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, when the airflow containing mist droplets passes through the baffle demister, due to the change in airflow direction, larger-diameter mist droplets collide with the baffle due to inertia and separate, achieving preliminary demisting. When the airflow passes through the wire mesh, the mist droplets are captured by the wire mesh under the action of inertial collision and Brownian diffusion, achieving further demisting. When tiny mist droplets pass through the fiber demister with the airflow, due to the interception of the fiber and the action of surface tension, the mist droplets are captured and aggregated by the fiber, eventually forming larger droplets that flow down, thereby preventing the liquid level of the exhaust gas tower from dropping, improving treatment efficiency, and preventing ammonia escape from exceeding the standard.

[0015] 2. In this utility model, the activated water spray pipe drives the scraper to reciprocate along the surface of the high-efficiency fiber demister via motor a, peeling off the droplets and solid particles attached to the surface of the fiber layer. Motor b drives the rotating plate to rotate, and the telescopic drainage cloth unfolds accordingly to form an "umbrella-shaped" dynamic seal. Centrifugal force throws the accumulated liquid to the drain hole, and the drain pipe is directly connected to the outside of the tower, thereby maintaining the defoaming efficiency by backwashing the wire mesh layer at regular intervals. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the composite demister at the top of the ammonia absorption tower proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the outer shell of the ammonia absorption tower top composite demister proposed in this utility model;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0019] Legend:

[0020] 1. Absorption tower shell; 2. Support shell a; 3. Baffle plate demister; 4. Large-hole stainless steel wire mesh layer; 5. Small-hole stainless steel wire mesh layer; 6. High-efficiency fiber demister; 7. Support plate a; 8. Support column a; 9. Motor a; 10. Drive column a; 11. Scraper; 12. Water spray pipe; 13. Support plate b; 14. Support plate c; 15. Support column b; 16. Motor b; 17. Drive column b; 18. Rotating plate; 19. Telescopic drainage cloth; 20. Support shell b; 21. Drainage hole; 22. Drainage pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figure 1 , Figure 2 , Figure 3This utility model provides an embodiment of a composite demister at the top of an ammonia absorption tower, comprising an absorption tower shell 1, which is a cylindrical structure made of high-strength carbon steel, possessing good pressure resistance and corrosion resistance. A support shell a2 is fixedly connected inside the absorption tower shell 1. The support shell a2 is an annular frame structure, providing stable support for the internal components. A baffle demister 3 is fixedly connected inside the support shell a2. The baffle demister 3 consists of multiple baffles arranged at a certain angle, with a baffle angle of sixty degrees. The design allows the mist-laden gas to change its flow direction multiple times between the baffles. Utilizing inertial force, the droplets collide with and adhere to the baffles, thus achieving gas-liquid separation and effectively removing larger droplets from the gas. A large-pore stainless steel wire mesh layer 4 is slidably connected to the top of the baffle demister 3. This layer is a multi-layered woven mesh structure with large openings, primarily used for preliminary filtration of the gas after passing through the baffle demister 3, intercepting larger impurities and incompletely separated droplets. The external surface of the baffle demister 3 is solid... A fixed connection is made inside the support shell a2 to ensure its stable installation. A small-hole stainless steel wire mesh layer 5 is slidably connected to the top of the large-hole stainless steel wire mesh layer 4. The small-hole stainless steel wire mesh layer 5 is also woven from stainless steel wire, but the mesh size is smaller than that of the large-hole stainless steel wire mesh layer 4, which can further filter tiny droplets and impurities in the gas, improving the gas purity. The outside of the small-hole stainless steel wire mesh layer 5 is fixedly connected to the inside of the support shell a2, working in conjunction with the large-hole stainless steel wire mesh layer 4 to enhance the demisting effect. A high-efficiency fiber filter is slidably connected to the top of the small-hole stainless steel wire mesh layer 5. The mist eliminator 6, also known as the high-efficiency fiber demister 6, is composed of a large number of fibers with a diameter of 5μm. These fibers have an extremely high specific surface area and are coated with a hydrophobic fluoride coating. The hydrophobic fluoride coating can reduce the surface energy of the fiber surface, making it difficult for mist droplets to adhere to the fiber surface. Instead, the droplets form larger droplets and fall off quickly, thereby improving the demisting efficiency. The high-efficiency fiber demister 6 is externally fixed to the outside of the support shell a2 for easy installation and maintenance. Through the above structural cooperation, the liquid level in the exhaust gas tower is prevented from dropping, the treatment efficiency is improved, and ammonia escape is prevented from exceeding the standard.

[0023] Reference Figure 1 , Figure 2 , Figure 3The absorption tower shell 1 has multiple support plates c14 fixedly connected inside. Each support plate c14 is a rectangular flat plate structure, providing support for subsequent components. Support columns b15 are fixedly connected to the outside of the multiple support plates c14. Each support column b15 is a cylindrical structure, capable of withstanding large loads. A motor b16 is fixedly connected to the top of each support column b15, providing stable power to a drive column b17. The drive end of the motor b16 is fixedly connected to the drive column b17, which is a slender cylindrical structure, transmitting the rotational motion of the motor b16 to a rotating plate 18. A rotating plate 18 is fixedly connected to the outside of the drive column b17. The rotating plate 18 is a circular flat plate structure, capable of rotating around the drive column b17 under the drive of the motor b16. A telescopic drainage cloth 19 is fixedly connected to the outside of the rotating plate 18. The telescopic drainage cloth 19 has a certain degree of elasticity, allowing it to expand or contract with the rotation of the rotating plate 18. The telescopic drainage cloth 19 is fixedly connected to the outside of... A support plate b13, which is a rectangular flat plate structure, provides support and fixation for the telescopic drainage cloth 19. A support shell b20, which is a ring frame structure, is fixedly connected to the outside of the support plate b13 to protect the internal components. The support plate b13 is fixedly connected to the inside of the absorption tower shell 1 and to the outside of the support column b15. The support plate b13 is slidably connected to the outside of the rotating plate 18 to ensure that the rotating plate 18 can rotate smoothly. The telescopic drainage cloth 19 is provided with a drainage hole 21, which is a circular hole to drain the water collected on the telescopic drainage cloth 19. A drainage pipe 22, which is a circular pipe, is fixedly connected to the inside of the absorption tower shell 1 and is located at the bottom of the drainage hole 21 to guide the water discharged from the drainage hole 21 to the outside of the absorption tower. Through the above structural cooperation, the defoaming efficiency is maintained by backwashing the wire mesh layer at regular intervals.

[0024] Reference Figure 1 , Figure 2 , Figure 3The absorption tower shell 1 has multiple support plates a7 fixedly connected inside. Each support plate a7 is a rectangular flat plate structure with sufficient strength and rigidity, providing a stable support foundation for subsequent components. Support columns a8 are fixedly connected inside each support plate a7. Each support column a8 is a cylindrical structure capable of withstanding large loads. A motor a9 is fixedly connected to the top of each support column a8, providing stable power to the drive column a10. The drive end of the motor a9 is fixedly connected to the drive column a10, which is a slender cylindrical structure capable of transmitting the rotational motion of the motor a9 to the scraper 11. The bottom of the drive column a10... A scraper 11 is fixedly connected. The scraper 11 is a rectangular flat plate structure with certain flexibility and wear resistance. The bottom of the scraper 11 is slidably connected to the top of the high-efficiency fiber demister 6. A water spray pipe 12 is fixedly connected inside the outer shell 1 of the absorption tower. The water spray pipe 12 is a circular pipe with certain pressure resistance and corrosion resistance. The water spray pipe 12 is set above the high-efficiency fiber demister 6. Multiple nozzles are evenly distributed on the water spray pipe 12. The nozzles can spray water in the form of mist to clean and cool the high-efficiency fiber demister 6, prevent the high-efficiency fiber demister 6 from being blocked or overheated due to long-term use, and ensure its normal operation.

[0025] Working principle: Ammonia gas containing liquid droplets and mist enters the absorption tower from the inlet of the outer shell 1. First, the gas passes through the baffle demister 3 fixed inside the support shell a2. Since the baffle demister 3 has a 60-degree bend angle, the gas flow direction changes as it passes through the baffle. The liquid droplets and larger mist particles collide with the baffle due to inertia and are thus separated, achieving preliminary demisting of the gas. The gas that has undergone preliminary demisting continues to rise and passes sequentially through the large-pore stainless steel wire mesh layer 4 and the small-pore stainless steel wire mesh layer 5. Both the large-pore stainless steel wire mesh layer 4 and the small-pore stainless steel wire mesh layer 5 are fixed to the outside of the support shell a2. Inside, as the gas passes through these two layers of wire mesh, the mesh openings intercept and condense the liquid droplets and mist in the gas. The large-pore stainless steel wire mesh layer 4 first intercepts the larger residual liquid droplets, while the small-pore stainless steel wire mesh layer 5 further intercepts the smaller liquid droplets and mist, thus further reducing the liquid droplet content in the gas. Subsequently, as the gas passes through the high-efficiency fiber demister 6, the tiny mist droplets are captured by the fibers and condensed into larger droplets. Due to the hydrophobicity of the fiber surface, the droplets do not easily adhere to the fibers but fall under the action of gravity, thereby achieving efficient removal of tiny mist droplets from the gas and making the discharged ammonia gas purer.

[0026] During equipment operation, impurities may accumulate on the surface of the high-efficiency fiber demister 6, affecting its demisting effect. At this time, the cleaning system is activated. Multiple support plates a7 fixed inside the absorption tower shell 1 provide support for the support column a8. The motor a9 fixed at the top of the support column a8 starts, and its drive end drives the drive column a10 to rotate. The scraper 11 fixed at the bottom of the drive column a10 rotates accordingly. The bottom of the scraper 11 is slidably connected to the top of the high-efficiency fiber demister 6. The rotation of the scraper 11 removes impurities from the surface of the high-efficiency fiber demister 6, maintaining its good demisting performance. Simultaneously, a water spray pipe 12 fixed inside the absorption tower shell 1 is positioned above the high-efficiency fiber demister 6, allowing for periodic water spraying to rinse the demister 6 and further clean its surface. Water accumulated during cleaning and equipment operation needs to be drained promptly. Multiple fixed support plates c14 provide support for the support column b15. The motor b16 fixed at the top of the support column b15 starts, and its drive end drives the drive column b17 to rotate. The rotating plate 18 fixed outside the drive column b17 rotates accordingly. The telescopic drainage cloth 19 fixed outside the rotating plate 18 expands or contracts under the drive of the rotating plate 18. The support plate b13 fixed outside the telescopic drainage cloth 19 provides stable support for the telescopic drainage cloth 19. The support plate b13 is fixed outside the absorption tower shell 1 and outside the support column b15, and the support plate b13 is slidably connected to the outside of the rotating plate 18 to ensure the stability of the rotation of the rotating plate 18. The accumulated water falls on the telescopic drainage cloth 19 and flows into the drain pipe 22 fixed inside the absorption tower shell 1 through the drain hole 21 set inside the telescopic drainage cloth 19, and finally discharges from the absorption tower, completing the collection and discharge of accumulated water.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite demister at the top of an ammonia absorption tower, comprising an absorption tower shell (1), characterized in that: The absorption tower shell (1) is fixedly connected to a support shell a (2), and the support shell a (2) is fixedly connected to a baffle demister (3). The baffle demister (3) has a 60-degree bend angle. The top of the baffle demister (3) is slidably connected to a large-hole stainless steel wire mesh layer (4). The top of the large-hole stainless steel wire mesh layer (4) is slidably connected to a small-hole stainless steel wire mesh layer (5). The top of the small-hole stainless steel wire mesh layer (5) is slidably connected to a high-efficiency fiber demister (6). The fiber diameter of the high-efficiency fiber demister (6) is 5 μm, and its surface is coated with a hydrophobic fluoride coating.

2. The ammonia absorber overhead composite demister according to claim 1, characterized in that: The outer side of the large-hole stainless steel wire mesh layer (4) is fixed inside the support shell a (2), the outer side of the small-hole stainless steel wire mesh layer (5) is fixed inside the support shell a (2), and the outer side of the high-efficiency fiber demister (6) is fixed outside the support shell a (2).

3. The ammonia absorber overhead composite demister according to claim 1, characterized in that: The absorption tower shell (1) is internally fixedly connected to multiple support plates a (7), and the multiple support plates a (7) are internally fixedly connected to support columns a (8). The top of the support columns a (8) is fixedly connected to a motor a (9).

4. The ammonia absorber overhead composite demister of claim 3, wherein: The drive end of the motor a (9) is fixedly connected to a drive column a (10), and the bottom of the drive column a (10) is fixedly connected to a scraper (11). The bottom of the scraper (11) is slidably connected to the top of the high-efficiency fiber demister (6).

5. The composite demister at the top of the ammonia absorption tower according to claim 1, characterized in that: A water spray pipe (12) is fixedly connected inside the outer shell (1) of the absorption tower, and the water spray pipe (12) is located above the high-efficiency fiber demister (6).

6. The ammonia absorber overhead composite mist eliminator of claim 1, wherein: The absorption tower shell (1) is internally fixedly connected to multiple support plates c (14), and externally fixedly connected to multiple support plates c (14) are support columns b (15). The top of the support column b (15) is fixedly connected to a motor b (16), the drive end of the motor b (16) is fixedly connected to a drive column b (17), and externally fixedly connected to a rotating plate (18).

7. The ammonia absorber overhead composite demister of claim 6, wherein: The rotating plate (18) is fixedly connected to a telescopic drainage cloth (19), the telescopic drainage cloth (19) is fixedly connected to a support plate b (13), the support plate b (13) is fixedly connected to a support shell b (20), the support plate b (13) is fixedly connected to the inside of the absorption tower shell (1), the support plate b (13) is fixedly connected to the outside of the support column b (15), the support plate b (13) is slidably connected to the outside of the rotating plate (18), the telescopic drainage cloth (19) is provided with a drainage hole (21), the absorption tower shell (1) is fixedly connected to a drainage pipe (22), and the drainage pipe (22) is located at the bottom of the drainage hole (21).

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