Reducing double-helix demister

Abstract

The utility model discloses a variable-diameter double-helix demister which comprises a cylinder body, and the cylinder body comprises a central cylinder body, a first-stage variable-diameter cylinder body, a first-stage demisting blade grid, a second-stage variable-diameter cylinder body and a second-stage demisting blade grid, the upper ends and the lower ends of the center cylinder, the first-stage variable-diameter cylinder and the second-stage variable-diameter cylinder are open, the first-stage variable-diameter cylinder and the second-stage variable-diameter cylinder are arranged at the lower end and the upper end of the center cylinder respectively and communicated with the center cylinder, the diameter of the lower end of the first-stage variable-diameter cylinder is smaller than that of the upper end of the center cylinder, and the diameter of the lower end of the second-stage variable-diameter cylinder is larger than that of the upper end of the second-stage variable-diameter cylinder. The first-stage demisting blade grid and the second-stage demisting blade grid are respectively arranged in the first-stage variable-diameter barrel and the second-stage variable-diameter barrel; each of the first-stage demisting blade grid and the second-stage demisting blade grid comprises a plurality of demisting blades, and the demisting blades are circumferentially arranged and are obliquely and upwards arranged in sequence in the same circumferential direction; a gap is formed between the adjacent ends of the adjacent demisting blades to form a demisting channel; and the adjacent ends of the adjacent demisting blades are overlapped in the axial direction of the central cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field of smoke dust removal and mist removal, and in particular relates to a variable diameter double-helix mist eliminator. Background Art

[0002] As a crucial component of the flue gas purification system, the performance of the desulfurization absorption tower is directly related to whether the flue gas emissions meet environmental standards. The demister, a key component of the absorption tower, is responsible for effectively separating tiny droplets and slurry from the flue gas, preventing these pollutants from being released into the atmosphere and causing environmental pollution.

[0003] Traditional demister designs primarily include flat-plate and ridge-type demisters. These operate based on the baffle principle, leveraging the inertia of mist droplets in the flue gas to cause them to collide and be captured as they pass through the demister blades. However, these demisters exhibit several significant technical limitations in practical applications.

[0004] First, the traditional baffle demister has a good removal effect on droplets larger than 15μm, but its capture efficiency is significantly reduced for finer droplets (such as droplets with a size less than 15μm), making it difficult to meet the increasingly stringent environmental emission standards. Especially in the pursuit of ultra-low emissions (such as dust concentration below 5mg / Nm 3 ) situation, the performance of traditional demisters is insufficient.

[0005] Secondly, baffle demisters are prone to scaling and clogging during operation due to factors such as droplet deposition and slurry adhesion. This not only affects demisting efficiency but also increases maintenance costs and operational difficulties. To maintain normal operation of the equipment, regular flushing operations are usually required. The wastewater generated during this process further increases the wastewater treatment burden of the desulfurization system, increasing overall operating costs.

[0006] Furthermore, the dust removal effect of traditional baffle demisters is relatively limited. When the desulfurization system is not equipped with additional dust removal equipment (such as wet electrostatic precipitators), the dust concentration at the outlet of the absorption tower is often difficult to stably control at a low level, especially under high dust loads or complex working conditions, and it is even more difficult to reach 20mg / Nm 3 Below, let alone achieving 5mg / Nm 3 ultra-low emission targets.

[0007] In summary, traditional baffle demisters have obvious deficiencies in terms of demisting efficiency, anti-clogging performance, and dust removal effect, and are unable to meet the high requirements of current and future environmental protection standards for the performance of desulfurization absorption towers. Utility Model Content

[0008] In order to solve the above problems, the purpose of the present invention is to provide a variable diameter double spiral demister, which can make the air flow form a spiral airflow to centrifuge out moisture and dust.

[0009] In order to achieve the above purpose, the technical solution of the utility model is:

[0010] A variable diameter double spiral demister, comprising a cylinder, wherein the cylinder comprises a central cylinder, a first-stage variable diameter cylinder, a first-stage demister blade cascade, a second-stage variable diameter cylinder and a second-stage demister blade cascade;

[0011] The upper and lower ends of the central cylinder, the primary reducing cylinder, and the secondary reducing cylinder are all open. The primary reducing cylinder and the secondary reducing cylinder are respectively arranged at the lower end and the upper end of the central cylinder and are connected thereto. The diameter of the lower end of the primary reducing cylinder is smaller than the diameter of the upper end, and the diameter of the lower end of the secondary reducing cylinder is larger than the diameter of the upper end. The primary defogger cascade and the secondary defogger cascade are respectively arranged in the primary reducing cylinder and the secondary reducing cylinder.

[0012] The first-stage demisting blade cascade and the second-stage demisting blade cascade each include a plurality of demisting blades, which are arranged circumferentially and arranged in a tilted upward direction in sequence along the same circumferential direction; adjacent ends of adjacent demisting blades have gaps therebetween to form a demisting channel; and in the axial direction of the central cylinder, adjacent ends of adjacent demisting blades overlap;

[0013] The airflow enters the cylinder through the lower end opening of the first-level variable-diameter cylinder. When passing through the first-level defogger blade cascade and the second-level defogger blade cascade, the airflow moves upward along each of the defogger blades into each of the defogger channels. After passing through each of the defogger channels, the airflow turns into a spiral airflow spiraling upward. The spiral airflow generates centrifugal force to throw the moisture and dust in it onto the inner wall of the cylinder, and then the moisture and dust flow down along the inner wall of the cylinder.

[0014] According to one embodiment of the present invention, the first-level demisting blade cascade includes a first-level fixing column, which is arranged at the center of the first-level variable diameter cylinder. The first-level demisting blade cascade is fan-shaped, and one end of the demisting blade of the first-level demisting blade cascade is fixedly connected to the inner wall of the first-level variable diameter cylinder, and the other end is fixedly connected to the first-level fixing column;

[0015] The secondary demisting blade grid includes a secondary fixing column, which is arranged at the center of the secondary variable diameter cylinder. The secondary demisting blade grid is fan-shaped, and one end of the demisting blade of the secondary demisting blade grid is fixedly connected to the inner wall of the secondary variable diameter cylinder, and the other end is fixedly connected to the secondary fixing column.

[0016] According to an embodiment of the present invention, the first-stage demisting blade cascade is arranged at the lower end opening of the first-stage variable diameter cylinder, and the second-stage demisting blade cascade is arranged at the upper end opening of the second-stage variable diameter cylinder.

[0017] According to an embodiment of the present invention, the first-stage reducing cylinder, the second-stage reducing cylinder and the central cylinder are connected by any means including socket, thread and flange.

[0018] According to an embodiment of the present invention, the number of the demisting blades in the first-stage demisting cascade and the second-stage demisting cascade is 4 to 10.

[0019] According to an embodiment of the present invention, the height of the demisting blades in the axial direction of the central cylinder is 20 to 100 mm.

[0020] According to an embodiment of the present invention, the central cylinder, the first-stage variable-diameter cylinder, the first-stage demisting blade grid, the second-stage variable-diameter cylinder and the second-stage demisting blade grid are made of glass fiber reinforced plastic, polypropylene or alloy materials.

[0021] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0022] 1. When the flue gas flows through the first-stage and second-stage defogger blades of the utility model, the flue gas flows upward along the defogger blades and enters the defogger channels. After passing through the defogger channels, the flue gas turns into a spiral airflow that spirals upward. The spiral airflow forms a high-speed centrifugal force to throw the moisture and dust in it onto the inner wall of the cylinder. Then the moisture and dust flow down along the inner wall of the cylinder, preventing moisture and dust from being entrained by the airflow for the second time. At the same time, it has the effect of recycling moisture and saving resources.

[0023] The first-level demisting blades and the second-level demisting blades are respectively arranged in the first-level variable diameter cylinder and the second-level variable diameter cylinder. The airflow at the variable diameter is complex, the turbulence effect is obvious, and the irregular movement of the airflow is intensified, which can further improve the demisting and dust removal effect.

[0024] 2. The first-stage demister blade grid of the utility model is arranged at the lower end opening of the first-stage variable diameter cylinder, and the second-stage demister blade grid is arranged at the upper end opening of the second-stage variable diameter cylinder. Being arranged at the opening rather than in the middle makes it easier to flush the demister blades, greatly reduces the risk of demister blockage, and improves the stability and reliability of the device operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 This utility model illustrates Figure 1 ;

[0027] Figure 2 This utility model illustrates Figure 2 .

[0028] Description of reference numerals:

[0029] 1. Central cylinder; 2. First-stage variable diameter cylinder; 3. First-stage demister blades; 4. First-stage fixed column; 5. Second-stage variable diameter cylinder; 6. Second-stage demister blades; 7. Second-stage fixed column. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and use non-precise ratios, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] See Figures 1 to 2 The core of the utility model is to provide a variable diameter double spiral demister, including a cylinder, the cylinder including a central cylinder 1, a first-stage variable diameter cylinder 2, a first-stage demister blade 3, a second-stage variable diameter cylinder 5 and a second-stage demister blade 6.

[0033] The upper and lower ends of the central cylinder 1, the first-level reducing cylinder 2 and the second-level reducing cylinder 5 are open. The first-level reducing cylinder 2 and the second-level reducing cylinder 5 are respectively arranged at the lower end and the upper end of the central cylinder 1 and are connected thereto. The diameter of the lower end of the first-level reducing cylinder 2 is smaller than the diameter of its upper end, and the diameter of the lower end of the second-level reducing cylinder 5 is larger than the diameter of its upper end. The first-level defogger cascade 3 and the second-level defogger cascade 6 are respectively arranged in the first-level reducing cylinder 2 and the second-level reducing cylinder 5.

[0034] Both the first-stage demisting blade cascade 3 and the second-stage demisting blade cascade 6 include a plurality of demisting blades, which are arranged at an inclination with respect to the horizontal plane, and a plurality of demisting blades are arranged circumferentially and arranged in sequence along the same circumferential direction and inclined upward, similar to the arrangement of fan blades and impellers; there is a gap between adjacent ends of adjacent demisting blades to form a demisting channel; and in the axial direction of the central cylinder 1, adjacent ends of adjacent demisting blades overlap.

[0035] The airflow enters the cylinder through the lower opening of the first-stage variable diameter cylinder 2. When passing through the first-stage demisting blade cascade 3 and the second-stage demisting blade cascade 6, the airflow moves upward along the various demisting blades into the various demisting channels. After passing through the various demisting channels, it turns into a spiral airflow that spirals upward. The spiral airflow generates centrifugal force to throw the moisture and dust inside it onto the inner wall of the cylinder. The moisture and dust then flow down along the inner wall of the cylinder and return to the absorption tower slurry pool, preventing the moisture and dust from being entrained by the airflow again, achieving the technical effect of demisting and dust removal, while also having the effect of recycling moisture and saving resources. The first-stage demisting blade cascade 3 and the second-stage demisting blade cascade 6 are respectively arranged in the first-stage variable diameter cylinder 2 and the second-stage variable diameter cylinder 5. The airflow at the diameter change is complex, the turbulence effect is obvious, and the irregular movement of the airflow is aggravated, which can further improve the demisting and dust removal effect.

[0036] Specifically, the first-level defogger grating 3 includes a first-level fixed column 4, which is arranged at the center of the first-level variable-diameter cylinder 2. The first-level defogger grating 3 is fan-shaped, and one end of the defogger blade of the first-level defogger grating 3 is fixedly connected to the inner wall of the first-level variable-diameter cylinder 2, and the other end is fixedly connected to the first-level fixed column 4; the second-level defogger grating 6 includes a second-level fixed column 7, which is arranged at the center of the second-level variable-diameter cylinder 5. The second-level defogger grating 6 is fan-shaped, and one end of the defogger blade of the second-level defogger grating 6 is fixedly connected to the inner wall of the second-level variable-diameter cylinder 5, and the other end is fixedly connected to the second-level fixed column 7.

[0037] Furthermore, the primary demister blades 3 are located at the lower opening of the primary variable diameter cylinder 2, while the secondary demister blades 6 are located near the upper opening of the secondary variable diameter cylinder 5. This means that the secondary demister blades 6 are a short distance away from the upper opening of the secondary variable diameter cylinder 5 to prevent moisture and dust from reaching the inner wall of the cylinder. Positioning them at the openings rather than in the middle facilitates flushing of the demister blades, significantly reducing the risk of demister blockage and improving the stability and reliability of the device.

[0038] The primary reducing cylinder 2, the secondary reducing cylinder 5 and the central cylinder 1 are connected by any means including socket, thread and flange. In this embodiment, they are connected by socket.

[0039] In order to form sufficient demisting channels, the number of demisting blades in the primary demisting cascade 3 and the secondary demisting cascade 6 are both 4 to 10. In this embodiment, the primary demisting cascade 3 is provided with 8 demisting blades, and the secondary demisting cascade 6 is provided with 8 demisting blades.

[0040] Preferably, in order to ensure that the flue gas flows through the demisting blades to generate sufficient centrifugal force, while considering not generating too high operating resistance, the height of the demisting blades should be neither too low nor too high. In this embodiment, the height of the demisting blades in the axial direction of the central cylinder 1 is 20 to 100 mm.

[0041] The operating environment of the variable diameter double spiral demister in this embodiment is an acidic environment, so the central cylinder 1, the first variable diameter cylinder 2, the first demister blade cascade 3, the second variable diameter cylinder 5 and the second demister blade cascade 6 are made of glass fiber reinforced plastic, polypropylene or alloy materials.

[0042] The variable diameter double spiral demister provided by the utility model is installed inside the desulfurization absorption tower. The flue gas flows from bottom to top. After entering the variable diameter double spiral demister, it first enters the first-stage demister blade 3 at the lower end inlet of the first-stage variable diameter cylinder 2. The flue gas generates turbulence and forms high-speed centrifugal force. The moisture and dust in the flue gas are thrown to the inner wall of the cylinder, and then return to the slurry pool of the absorption tower through the inner wall of the cylinder. At the same time, this is a variable diameter cylinder. The flow field of the flue gas will be more complicated when flowing through the variable diameter section, which enhances the turbulence effect and intensifies the irregular movement of the flue gas, so that more moisture and dust are thrown to the inner wall of the cylinder, further improving the demisting and dust removal effect. Then, the flue gas flows through the central cylinder 1 and enters the secondary demisting blade 6 at the upper end outlet of the secondary variable diameter cylinder 5. Similarly, under the dual action of the secondary demisting blade 6 and the variable diameter cylinder, the flue gas continues to generate a large amount of turbulence and form a high-speed centrifugal force. A large amount of moisture and dust are further thrown to the inner wall of the cylinder and captured, and then return to the slurry pool of the absorption tower through the inner wall of the cylinder, ultimately achieving the technical effect of deep and efficient demisting and dust removal.

[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they will still fall within the scope of protection of the present invention.

Claims

1. A variable diameter double spiral mist eliminator, characterized in that: The cylinder comprises a central cylinder, a first-stage variable diameter cylinder, a first-stage demisting blade cascade, a second-stage variable diameter cylinder and a second-stage demisting blade cascade; The upper and lower ends of the central cylinder, the primary reducing cylinder, and the secondary reducing cylinder are all open. The primary reducing cylinder and the secondary reducing cylinder are respectively arranged at the lower end and the upper end of the central cylinder and are connected thereto. The diameter of the lower end of the primary reducing cylinder is smaller than the diameter of the upper end, and the diameter of the lower end of the secondary reducing cylinder is larger than the diameter of the upper end. The primary defogger cascade and the secondary defogger cascade are respectively arranged in the primary reducing cylinder and the secondary reducing cylinder. The first-stage demisting blade cascade and the second-stage demisting blade cascade each include a plurality of demisting blades, which are arranged circumferentially and arranged in a tilted upward direction in sequence along the same circumferential direction; adjacent ends of adjacent demisting blades have gaps therebetween to form a demisting channel; and in the axial direction of the central cylinder, adjacent ends of adjacent demisting blades overlap; The airflow enters the cylinder through the lower end opening of the first-level variable-diameter cylinder. When passing through the first-level defogger blade cascade and the second-level defogger blade cascade, the airflow moves upward along each of the defogger blades into each of the defogger channels. After passing through each of the defogger channels, the airflow turns into a spiral airflow spiraling upward. The spiral airflow generates centrifugal force to throw the moisture and dust in it onto the inner wall of the cylinder, and then the moisture and dust flow down along the inner wall of the cylinder.

2. The variable diameter double spiral mist eliminator according to claim 1, characterized in that: The first-level demisting blade cascade includes a first-level fixing column, which is arranged at the center of the first-level variable diameter cylinder. The first-level demisting blade cascade is fan-shaped, and one end of the demisting blade of the first-level demisting blade cascade is fixedly connected to the inner wall of the first-level variable diameter cylinder, and the other end is fixedly connected to the first-level fixing column; The secondary demisting blade grid includes a secondary fixing column, which is arranged at the center of the secondary variable diameter cylinder. The secondary demisting blade grid is fan-shaped, and one end of the demisting blade of the secondary demisting blade grid is fixedly connected to the inner wall of the secondary variable diameter cylinder, and the other end is fixedly connected to the secondary fixing column.

3. The variable diameter double spiral mist eliminator according to claim 1, characterized in that: The first-stage demisting blade cascade is arranged at the lower end opening of the first-stage variable diameter cylinder, and the second-stage demisting blade cascade is arranged near the upper end opening of the second-stage variable diameter cylinder.

4. The variable diameter double spiral mist eliminator according to claim 1, characterized in that: The first-stage reducing cylinder, the second-stage reducing cylinder and the central cylinder are connected by any means including socket, thread and flange.

5. The variable diameter double spiral mist eliminator according to claim 1, characterized in that: The number of the demisting blades in the first-stage demisting cascade and the second-stage demisting cascade are both 4 to 10.

6. The variable diameter double spiral mist eliminator according to claim 1, characterized in that: The height of the demisting blades in the axial direction of the central cylinder is 20 to 100 mm.

7. The variable diameter double spiral demister according to any one of claims 1 to 6, characterized in that: The central cylinder, the first-stage variable-diameter cylinder, the first-stage demisting blade cascade, the second-stage variable-diameter cylinder and the second-stage demisting blade cascade are made of glass fiber reinforced plastic, polypropylene or alloy material.

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