Multistage spiral demister, demisting device and absorption tower

Abstract

The multistage spiral demister comprises a cylinder body, a plurality of spiral interception grooves and a plurality of demisting blade grids, the upper end and the lower end of the cylinder body are open, and the spiral interception grooves are spirally arranged on the inner wall of the cylinder body and extend from the upper end to the lower end of the cylinder body. The plurality of demisting blade grids are sequentially and fixedly arranged in the cylinder body along the axial direction of the cylinder body; a plurality of demisting blades are arranged on the circumference of the demisting blade grid, and the demisting blades are obliquely arranged upwards 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; in the axial direction of the cylinder body, the adjacent ends of the adjacent demisting blades are overlapped; airflow enters the barrel through the opening in the lower end of the barrel, upwards enters the demisting channels along the demisting blades and becomes spiral airflow after passing through the demisting channels, the spiral airflow forms centrifugal force to throw water and dust in the spiral airflow onto the inner wall of the barrel, and then the water and the dust are intercepted by the spiral intercepting grooves and flow down along the spiral intercepting grooves in a spiral mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas dust removal and mist removal, and in particular relates to a multi-stage spiral mist eliminator, a mist eliminator device and an absorption tower. 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 multi-stage spiral demister, a demister device and an absorption tower. The demister can 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 multi-stage spiral demister comprises a cylinder, a plurality of spiral intercepting grooves and a plurality of demister blades, wherein the upper and lower ends of the cylinder are both open, the spiral intercepting grooves are spirally arranged on the inner wall of the cylinder and extend from the upper end to the lower end of the cylinder, and the plurality of demister blades are fixedly arranged in the cylinder in sequence along the axial direction of the cylinder;

[0011] The circumference of the demisting blade cascade is provided with a plurality of demisting blades, and the demisting blades are arranged in sequence along the same circumferential direction and tilted upward; adjacent ends of adjacent demisting blades have gaps therebetween to form a demisting channel; and in the axial direction of the cylinder, adjacent ends of adjacent demisting blades overlap;

[0012] The air flow enters the cylinder through the lower end opening of the cylinder. When passing through the defogger blades, the air flow goes upward along each defogger blade and enters each defogger channel. After passing through each defogger channel, the air flow turns into a spiral airflow spiraling upward. The spiral airflow forms a centrifugal force to throw the moisture and dust therein onto the inner wall of the cylinder. Then, the moisture and dust are intercepted by the spiral interception groove and flow down along its spiral.

[0013] According to one embodiment of the present invention, the demisting blade cascade includes an annular outer plate and an annular inner plate, the annular inner plate is arranged inside the annular outer plate, the demisting blade is arranged between the annular outer plate and the annular inner plate, and the demisting blade is fan-shaped, and the two ends of the demisting blade are respectively fixed to the annular outer plate and the annular inner plate;

[0014] It comprises a fixing rod, which is arranged at the center of the cylinder and fixedly connected to the cylinder through a supporting portion, and the annular inner enclosure plate is sleeved on the fixing rod and fixedly connected to the fixing rod.

[0015] According to an embodiment of the present invention, the support portion is provided at the lower end of the fixing rod, and the support portion includes a plurality of support plates, one end of each support plate is fixedly connected to the inner wall of the cylinder, and the other end is fixedly connected to the fixing rod.

[0016] According to an embodiment of the present invention, there is an installation spacing of 1 to 3 mm between the annular outer plate and the spiral intercepting groove.

[0017] According to an embodiment of the present invention, the central angle of the demisting blade is 30 to 60 degrees.

[0018] According to an embodiment of the present invention, a plurality of spiral plates are provided on the inner wall of the cylinder, and the spiral intercepting grooves are provided on the spiral plates.

[0019] According to an embodiment of the present invention, the inclination angle of the demisting blades is 15 to 45 degrees.

[0020] According to an embodiment of the present invention, the width of the spiral intercepting groove is 3 to 10 mm.

[0021] According to an embodiment of the present invention, two demisting blades are included, and the demisting blades are respectively arranged at the upper and lower ends of the cylinder.

[0022] Based on the same concept, the present invention also provides a defogger, comprising a multi-stage spiral defogger and a defogger plate as described in any one of the above embodiments, wherein the defogger plate is provided with a plurality of accommodating through holes, and a plurality of the multi-stage spiral defoggers are respectively arranged in the plurality of the accommodating through holes.

[0023] Based on the same concept, the present invention also provides an absorption tower, comprising the demisting device and a tower body as described in the above embodiment, wherein a plurality of the demisting devices are fixed in the tower body in sequence from bottom to top.

[0024] According to one embodiment of the present invention, the tower body is provided with a support ring plate and several support beams below the defogger device on each layer. The support ring plate is arranged along the inner wall of the tower body, and the defogger device is arranged on the support ring plate and several support beams.

[0025] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0026] 1. The flue gas of the utility model enters the cylinder through the lower opening of the cylinder. When passing through the demister blades, the flue gas flows upward along the demister blades and enters the demister channels. After passing through the demister 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 inside it onto the inner wall of the cylinder. The moisture and dust are then intercepted and collected by the spiral interception groove. The moisture carries the dust and flows down the spiral interception groove, preventing the 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.

[0027] Moreover, the utility model can set up multiple demisting blades according to actual needs to form multi-stage spiral demisting. For example, two demisting blades are set up, the first-level demisting blade is used for pretreatment, and the second-level demisting blade is used for fine treatment. It can effectively remove the droplets and dust entrained in the flue gas and greatly improve the demisting and dust removal performance of the demister.

[0028] 2. There is an installation distance between the annular outer plate and the spiral interception groove of the utility model, so that the demisting blades can be freely pulled out from the cylinder, which is convenient for inspection, cleaning and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of the multi-stage spiral demister of the utility model from the first perspective;

[0031] Figure 2 This is a schematic diagram of the multi-stage spiral demister of the utility model from a second perspective;

[0032] Figure 3 This is a schematic diagram of the demisting blade cascade of the utility model;

[0033] Figure 4 This is a schematic diagram of the cylinder of the utility model;

[0034] Figure 5 This is a schematic diagram of the demisting device of the utility model;

[0035] Figure 6 This is a schematic diagram of the absorption tower of the utility model.

[0036] Description of reference numerals:

[0037] 1. Absorption tower; 2. Multi-stage spiral demister; 21. Cylinder; 22. Spiral intercepting trough; 23. First-stage demister blade cascade; 231. First-stage annular outer plate; 232. First-stage demister blade; 233. First-stage annular inner plate; 24. Second-stage demister blade cascade; 241. Second-stage annular outer plate; 242. Second-stage demister blade; 243. Second-stage annular inner plate; 25. Fixing rod; 26. Support plate; 3. Support ring plate; 4. Support beam; 5. demister plate. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] Example 1

[0041] See Figures 1 to 4 The core of the present utility model is to provide a multi-stage spiral demister, including a cylinder 21, a plurality of spiral intercepting grooves 22 and a plurality of demisting blades. The upper and lower ends of the cylinder 21 are open. The spiral intercepting grooves 22 are spirally arranged on the inner wall of the cylinder 21 and extend from the upper end to the lower end of the cylinder 21. The plurality of demisting blades are fixed in sequence in the cylinder 21 along the axial direction of the cylinder 21.

[0042] A number of demisting blades are arranged on the circumference of the demisting blade grid. The demisting blades are arranged at an angle to the horizontal plane, and the demisting blades are arranged in sequence along the same circumferential direction and tilted upward, similar to the arrangement of fan blades and impellers; there is a gap between the adjacent ends of adjacent demisting blades to form a demisting channel, and in the axial direction of the cylinder 21, the adjacent ends of adjacent demisting blades overlap.

[0043] The lower end opening of the cylinder 21 is the inlet of the flue gas, and the upper end opening is the outlet of the flue gas. The flue gas flows into the cylinder 21 through the lower end opening of the cylinder 21. When passing through the defogger blades, the flue gas flows upward along the various defogger blades into the various defogger channels. After passing through the various defogger channels, it becomes a spiral airflow spiraling upward. The spiral airflow forms a centrifugal force to throw the moisture and dust inside it onto the inner wall of the cylinder 21, and then the moisture and dust are intercepted by the spiral interception groove 22 and flow down along its spiral.

[0044] The demister blades include an annular outer plate and an annular inner plate, which are positioned within the outer plate. Demisting blades are positioned between the two plates and are fan-shaped, with their ends fixedly connected to the outer and inner plates, respectively. The demister blades also include a fixing rod 25, which is positioned at the center of the cylinder 21 and fixedly connected to the cylinder 21 via a support. The inner plate is sleeved on the fixing rod 25 and fixedly connected to it.

[0045] The support portion is arranged at the lower end of the fixed rod 25, and the support portion includes a plurality of support plates 26. The plurality of support plates 26 are arranged on the peripheral side of the fixed rod 25. One end of the support plate 26 is fixedly connected to the inner wall of the cylinder 21, and the other end is fixedly connected to the fixed rod 25. In this embodiment, three support plates 26 are provided.

[0046] Preferably, there is an installation spacing of 1 to 3 mm between the annular peripheral plate and the spiral interception groove 22, so that the demisting blades can be freely withdrawn from the cylinder 21, which is convenient for inspection, cleaning and maintenance.

[0047] Furthermore, a plurality of spiral plates are provided on the inner wall of the cylinder 21, and the spiral interception grooves 22 are provided on the spiral plates, so that the arrangement of the spiral interception grooves 22 is more convenient.

[0048] Preferably, the inclination angle of the demisting blades is 15 to 45 degrees, so as to ensure that the flue gas can generate sufficient centrifugal force after passing through the demisting blades without generating excessive running resistance.

[0049] Preferably, the width of the spiral interception groove 22 is 3 to 10 mm, which can minimize the operating resistance of the demister while ensuring that moisture and dust are fully intercepted.

[0050] The present embodiment includes two demisting blades, namely a primary demisting blade 23 and a secondary demisting blade 24 . The primary demisting blade 23 and the secondary demisting blade 24 are respectively arranged at the lower end and the upper end of the cylinder 21 .

[0051] The first-level defogger grating 23 includes a first-level annular outer plate 231, a plurality of first-level defogger blades 232 and a first-level annular inner plate 233. The plurality of first-level defogger blades 232 are arranged between the first-level annular outer plate 231 and the first-level annular inner plate 233, and the first-level annular inner plate 233 is sleeved and fixedly connected to the lower end of the fixing rod 25.

[0052] The secondary demisting blade grid 24 includes a secondary annular outer plate 241, a plurality of secondary demisting blades 242 and a secondary annular inner plate 243. The plurality of secondary demisting blades 242 are arranged between the secondary annular outer plate 241 and the secondary annular inner plate 243, and the secondary annular inner plate 243 is sleeved and fixedly connected to the upper end of the fixing rod 25.

[0053] Preferably, the central angle of the first-stage demisting blades 232 and the second-stage demisting blades 242 is 30 to 60°, that is, the number of the first-stage demisting blades 232 and the second-stage demisting blades 242 ranges from 6 to 12. In this embodiment, 8 first-stage demisting blades 232 and 8 second-stage demisting blades are provided.

[0054] The multi-stage spiral demister 2 of the present invention is installed inside the absorption tower 1. The flue gas flows from bottom to top. After entering the cylinder 21, it is first pre-treated by the first-stage demister blades 23 and then further refined by the second-stage demister blades 24. When the flue gas flows through the first-stage demister blades 232 and the second-stage demister blades 242, high-speed centrifugal force is generated, and the moisture and dust in the flue gas are thrown to the inner wall of the cylinder 21. The flue gas is then intercepted and collected by the spiral interception groove 22, and flows downward along the curve of the spiral interception groove 22. Ultimately, the moisture and dust are prevented from being entrained by the flue gas again, achieving the technical effect of demisting and dust removal.

[0055] Example 2

[0056] See Figure 5 Another core of the present invention is to provide a defogger, comprising several multi-stage spiral defoggers 2 and defogger plates 5 of embodiment 1, wherein the defogger plates 5 are provided with several accommodating through holes, and several multi-stage spiral defoggers 2 are respectively arranged in the several accommodating through holes.

[0057] In actual applications, the size of the demister plate 5 and the number of the multi-stage spiral demisters 2 on the demister plate 5 can be adjusted according to actual needs.

[0058] Example 3

[0059] See Figure 6 Another core aspect of the present invention is an absorption tower 1 comprising several demisters according to Example 2 and a tower body, wherein the demisters are sequentially mounted within the tower body from bottom to top. In this embodiment, two layers of demisters are provided; in actual practice, the number of layers can be adjusted based on operating conditions.

[0060] The tower body is provided with a full circle of support ring plates 3 and several support beams 4 below each layer of the demisting device. The support ring plates 3 are arranged along the inner wall of the tower body and are fixedly connected to the inner wall of the tower body. The demisting device is arranged on the support ring plates 3 and several support beams 4.

[0061] 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 multi-stage spiral demister, characterized in that: It comprises a cylinder, a plurality of spiral intercepting grooves and a plurality of demisting blades, wherein the upper and lower ends of the cylinder are both open, the spiral intercepting grooves are spirally arranged on the inner wall of the cylinder and extend from the upper end to the lower end of the cylinder, and the plurality of demisting blades are fixed in the cylinder in sequence along the axial direction of the cylinder; The circumference of the demisting blade cascade is provided with a plurality of demisting blades, and the demisting blades are arranged in sequence along the same circumferential direction and tilted upward; adjacent ends of adjacent demisting blades have gaps therebetween to form a demisting channel; and in the axial direction of the cylinder, adjacent ends of adjacent demisting blades overlap; The air flow enters the cylinder through the lower end opening of the cylinder. When passing through the defogger blades, the air flow goes upward along each defogger blade and enters each defogger channel. After passing through each defogger channel, the air flow turns into a spiral airflow spiraling upward. The spiral airflow forms a centrifugal force to throw the moisture and dust therein onto the inner wall of the cylinder. Then, the moisture and dust are intercepted by the spiral interception groove and flow down along its spiral.

2. The multi-stage spiral demister according to claim 1, characterized in that: The demisting blade cascade includes an annular outer plate and an annular inner plate, the annular inner plate is arranged inside the annular outer plate, the demisting blades are arranged between the annular outer plate and the annular inner plate, and the demisting blades are fan-shaped, and the two ends of the demisting blades are respectively fixed to the annular outer plate and the annular inner plate; It comprises a fixing rod, which is arranged at the center of the cylinder and fixedly connected to the cylinder through a supporting portion, and the annular inner enclosure plate is sleeved on the fixing rod and fixedly connected to the fixing rod.

3. The multi-stage spiral demister according to claim 2, characterized in that: The support portion is provided at the lower end of the fixing rod, and the support portion comprises a plurality of support plates, one end of the support plate is fixedly connected to the inner wall of the cylinder, and the other end of the support plate is fixedly connected to the fixing rod.

4. The multi-stage spiral mist eliminator according to claim 2, characterized in that: There is an installation spacing of 1 to 3 mm between the annular peripheral plate and the spiral intercepting groove.

5. The multi-stage spiral mist eliminator according to claim 2, characterized in that: The central angle of the demisting blade is 30 to 60 degrees.

6. The multi-stage spiral mist eliminator according to claim 1, characterized in that: A plurality of spiral plates are provided on the inner wall of the cylinder, and the spiral intercepting grooves are provided on the spiral plates.

7. The multi-stage spiral mist eliminator according to claim 1, characterized in that: The inclination angle of the demisting blades is 15 to 45 degrees.

8. The multi-stage spiral mist eliminator according to claim 1, characterized in that: The width of the spiral intercepting groove is 3 to 10 mm.

9. The multi-stage spiral demister according to claim 1, characterized in that: It comprises two demisting blade grids, which are respectively arranged at the upper and lower ends of the cylinder.

10. A demisting device, characterized in that: It comprises a plurality of multi-stage spiral demisters and demister plates according to any one of claims 1 to 9, wherein the demister plates are provided with a plurality of accommodating through holes, and the plurality of multi-stage spiral demisters are respectively arranged in the plurality of accommodating through holes.

11. An absorption tower, characterized in that: It comprises a plurality of demisting devices as claimed in claim 10 and a tower body, wherein the plurality of demisting devices are fixed in the tower body in sequence from bottom to top.

12. The absorption tower according to claim 11, characterized in that The tower body is provided with a supporting ring plate and a plurality of supporting beams below the demisting device on each layer. The supporting ring plate is arranged along the inner wall of the tower body, and the demisting device is arranged on the supporting ring plate and the plurality of supporting beams.

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