A spiral dust removal and demister, a demister device and an absorption tower

Abstract

The present invention discloses a spiral dust removal and demister, a demister device and an absorption tower, comprising: a cylinder, a hollow cavity connected at both ends for flue gas to pass through is provided in the cylinder. An inner spiral portion is detachably connected in the hollow cavity. An outer spiral portion is detachably connected in the inner spiral portion. At the same time, the spiral path of the inner spiral portion is different from the spiral path of the outer spiral portion. The spiral dust removal and demister is provided as a cylinder connected at both ends, an inner thread portion is detachably connected on the inner wall surface of the cylinder, and an outer thread portion is provided in the inner thread portion. After the flue gas enters the hollow cavity of the cylinder, it enters the outer thread portion and forms a high-speed centrifugal force, so that the droplets and dust contained in the flue gas expand outward, separate from the flue gas and enter the threads of the inner thread portion, and the threads of the inner thread portion block the droplets and dust and flow down along the threads, preventing the dust and droplets from being entrained for the second time, thereby achieving the effect of improving the dust removal and demister performance.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas absorption towers, and in particular relates to a spiral dust demister, a demister device and an absorption tower. Background Art

[0002] The demister is an important part of the desulfurization absorption tower. The demister is installed above the absorption tower. Its main function is to separate the entrained droplets and slurry in the flue gas to prevent the droplets from entering the chimney and being discharged into the atmosphere. Its working mechanism is: the droplets carried in the flue gas pass through the demister at a certain speed. Due to inertia, the droplets hit the demister blades and are captured. When the captured droplets increase, they fall down after reaching a certain weight and enter the desulfurization tower again.

[0003] Traditional baffle demisters include flat plate demisters and ridge demisters, which remove droplets with a particle size of more than 15μm. Baffle demisters are prone to scaling and clogging. In actual operation, in order to ensure the normal operation of the equipment, they need to be flushed regularly, resulting in a large amount of wastewater in the desulfurization system. At the same time, the dust removal effect of traditional baffle demisters is limited. If there is no dust removal device such as a wet electrostatic precipitator at the back end of the desulfurization, it is difficult to ensure that the dust concentration at the outlet of the absorption tower is less than 20mg / Nm3, not to mention achieving ultra-low emissions of 5mg / Nm3.

[0004] Therefore, improving the dust removal and mist removal performance of the demister has important environmental and social significance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a spiral dust removal and demister, a demister device and an absorption tower to improve the dust removal and demister performance.

[0006] To solve the above problems, the technical solution of the present invention is:

[0007] A spiral dust and mist remover of the present invention comprises:

[0008] A cylinder body, wherein a hollow cavity with two ends connected for smoke to pass through is provided in the cylinder body;

[0009] An inner spiral portion, the inner spiral portion being detachably connected to the hollow cavity;

[0010] an outer spiral portion, the outer spiral portion being detachably connected to the inner spiral portion;

[0011] The helical path of the inner helical portion is different from the helical path of the outer helical portion.

[0012] In the spiral dust and mist remover of the present invention, the inner spiral portion includes a plurality of spiral strips; the plurality of spiral strips are spaced apart and connected to the wall of the hollow cavity, and cooperate with the inner wall surface of the hollow cavity to form a spiral water collecting trough.

[0013] The spiral dust and mist remover of the present invention, the outer spiral part includes spiral blades and a rod body; the spiral blades are arranged around the rod body; the outer surface of the spiral blades is connected to the wall of a plurality of spiral strips of the spiral water collecting trough.

[0014] The spiral dust and mist remover of the present invention has a through hole on the rod body which is connected with an external cleaning device.

[0015] In the spiral dust and mist remover of the present invention, the spiral directions of the spiral water collecting trough and the spiral blades are opposite.

[0016] In the spiral dust and mist remover of the present invention, the cylinder, the inner spiral part and the outer spiral part are made of polypropylene plastic or fiber reinforced plastic.

[0017] A demisting device of the present invention comprises a filter plate and the above-mentioned spiral dust demister; the filter plate is provided with a plurality of accommodating through holes for accommodating the spiral dust demister; the spiral dust demister is arranged in the accommodating through holes.

[0018] An absorption tower of the present invention is provided with the above-mentioned demisting device.

[0019] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0020] 1. An embodiment of the present invention configures the demister as a cylinder with two ends connected, with an internal threaded portion detachably connected to the inner wall surface of the cylinder, and an external threaded portion is arranged inside the internal threaded portion. At the same time, the spiral paths of the internal threaded portion and the external threaded portion are different. When the flue gas enters the hollow cavity of the cylinder, it enters the external threaded portion and forms a high-speed centrifugal force, causing the mist droplets and dust contained in the flue gas to expand outward, separate from the flue gas and enter the threads of the internal threaded portion. Due to the difference in the threaded path, the threads of the internal threaded portion block the mist droplets and dust and flow down along the threads, preventing the dust and mist droplets from being entrained for the second time, and finally further improving the dust removal and demisting effect.

[0021] 2. In one embodiment of the present invention, the rod body is configured as a hollow rod body for passing flushing water, thereby improving the flushing efficiency of the device; on the other hand, the internal threaded portion and the external threaded portion can be freely withdrawn from the spiral barrel, which is convenient for inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a spiral dust and mist eliminator of the present invention;

[0023] Figure 2 is a schematic diagram of the outer spiral portion of the present invention;

[0024] Figure 3 It is an installation elevation layout diagram of the absorption tower of the present invention;

[0025] Figure 4 It is the installation plan layout diagram of the absorption tower of the present invention;

[0026] Figure 5 This is another installation elevation layout diagram of the absorption tower of the present invention.

[0027] Explanation of the reference numerals: 1: absorption tower; 21: primary ridge demister; 22: secondary ridge demister; 3: spiral dust removal demister; 31: cylinder; 32: inner spiral portion; 33: outer spiral portion; 331: spiral blade; 332: rod body; 4: support beam. DETAILED DESCRIPTION

[0028] The spiral dust demister, demister device and absorption tower proposed by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0029] Embodiment 1

[0030] See also Figure 1 and Figure 2 In one embodiment, a spiral dust and mist remover 3 includes: a cylinder 31, wherein the cylinder 31 is provided with a hollow cavity with two ends connected for smoke to pass through. An inner spiral portion 32 is detachably connected to the hollow cavity. An outer spiral portion 33 is detachably connected to the inner spiral portion 32. Meanwhile, the spiral path of the inner spiral portion 32 is different from the spiral path of the outer spiral portion 33.

[0031] The spiral dust and mist remover 3 is configured as a cylinder 31 connected at both ends, and an internal threaded portion is detachably connected to the inner wall surface of the cylinder 31, and an external threaded portion is provided inside the internal threaded portion. At the same time, the spiral paths of the internal threaded portion and the external threaded portion are different. When the flue gas enters the hollow cavity of the cylinder 31, it enters the external threaded portion and forms a high-speed centrifugal force, causing the mist droplets and dust contained in the flue gas to expand outward, separate from the flue gas and enter the threads of the internal threaded portion. Due to the difference in the threaded path, the threads of the internal threaded portion block the mist droplets and dust and flow down along the threads, preventing the dust and mist droplets from being entrained for the second time, and finally further improving the effect of dust removal and mist removal.

[0032] In the present embodiment, the inner spiral portion 32 includes a plurality of spiral strips; the plurality of spiral strips are spaced apart and connected to the wall in the hollow cavity, and cooperate with the inner wall surface of the hollow cavity to form a spiral water collecting trough. The wall connection means that the diameter of the hollow cavity is slightly smaller than the outer diameter of the spiral strip on the horizontal plane. After the spiral strip is loaded into the hollow cavity, it directly contacts the inner wall surface of the cylinder 31 and is fixed by friction. When repair or maintenance is required, the spiral strip can be directly pulled out of the cylinder 31. In other embodiments, a groove adapted to the spiral strip can also be directly provided on the inner wall surface of the cylinder 31, and the spiral strip is directly inserted into the cylinder 31 and then snapped into the adapted groove. The detachable connection between the spiral strip and the cylinder 31 can also be achieved by other means, which are not specifically limited here.

[0033] In this embodiment, the outer spiral portion 33 includes a spiral blade 331 and a rod body 332; the spiral blade 331 is arranged around the rod body 332; and the outer surface of the spiral blade 331 is connected to the wall of several spiral strips of the spiral water collecting tank. That is, the spiral blade 331 and the rod body 332 are integrally arranged, and the spiral blade 331 is connected to the wall so that the inner diameter of the spiral strip is slightly smaller than the diameter of the spiral blade 331. In this way, when the spiral blade 331 is inserted into the cylinder 31 equipped with the spiral strip, it can contact the inner surface of the inner diameter of the spiral strip and be fixed by the friction force of the contact surface. When repair or maintenance is required, the spiral blade 331 can be directly pulled out from the spiral strip. In other embodiments, a groove adapted to the spiral blade 331 can also be directly provided on the inner surface of the spiral strip, and the spiral blade 331 is directly inserted into the cylinder 31 and then stuck into the groove adapted to the spiral strip. The detachable connection between the spiral blade 331 and the spiral strip can also be achieved by other methods, which are not specifically limited here. Of course, the spiral radius at the lower end of the spiral blade is the same as the spiral radius at the upper end. Of course, the spiral radius at the upper end can also be set to be smaller than the spiral radius at the lower end. The specific setting of the spiral radius is not limited here.

[0034] Furthermore, a through hole connected to an external cleaning device is provided on the rod body 332. That is, the rod body 332 is a hollow structure, and a flushing device is connected inside to clean the gypsum slurry attached to the equipment, further improving the flushing efficiency of the device and the operating performance of the absorption tower 1.

[0035] Preferably, the spiral directions of the spiral water collecting tank and the spiral blade 331 are opposite. If the spiral water collecting tank is designed to be reverse-rotating, the spiral blade 331 is designed to be forward-rotating; of course, the spiral water collecting tank can also be designed to be forward-rotating and the spiral blade 331 can be designed to be reverse-rotating, which is not limited here. When the spiral directions are opposite, the smoke enters the spiral blade 331 and is centrifuged at high speed, and the droplets and dust separated outward are blocked by the spiral bars of the reverse spiral water collecting tank and flow out along the spiral bars.

[0036] In this embodiment, the cylinder 31 , the inner spiral portion 32 and the outer spiral portion 33 are made of polypropylene plastic or fiber reinforced plastic.

[0037] The following further explains the purification process of flue gas in the demister.

[0038] After the flue gas enters the spiral blades 331, high-speed centrifugal force is generated, causing the droplets and dust contained in the flue gas to expand outward, detach from the flue gas and be thrown into the spiral water collection tank; the spiral water collection tank and the spiral blades 331 have opposite spiral directions, which can avoid the secondary entrainment of dust and droplets when they flow downward and contact with the flue gas, so that they can smoothly flow downward along the wall of the spiral water collection tank and return to the slurry pool, achieving the effect of dust removal and mist removal. The spiral dust removal and mist removal device 3 of this embodiment can effectively remove droplets smaller than 15μm and reduce the droplet concentration at the outlet to 20mg / Nm 3 ; At the same time, it effectively removes dust and reduces the dust concentration at the outlet to 5mg / Nm 3 .

[0039] Embodiment 2

[0040] See also Figure 4 The demisting device of this embodiment includes a filter plate and the spiral dust demister 3 in the above-mentioned embodiment 1; the filter plate is provided with a plurality of accommodating through holes for accommodating the spiral dust demister 3, and the spiral dust demister 3 is arranged in the accommodating through holes. The shape of the filter plate can be adapted to the cross section of the absorption tower so as to be installed in the absorption tower and achieve sealing, so that the flue gas is discharged after passing through the spiral dust demister 3. The number of accommodating through holes on the filter plate can also be set according to the required ventilation volume and the cross-sectional area of ​​the absorption tower.

[0041] Embodiment 3

[0042] See also Figure 3 An absorption tower 1 of this embodiment is provided with the demisting device in the above-mentioned embodiment 2.

[0043] When the dust removal and mist removal requirements are high, a primary ridge demister 21 and a secondary ridge demister 22 and at least one mist removal device can be respectively arranged in the flue according to the flue gas flow direction. The mist removal device is installed through the support beam 4 arranged in the absorption tower 1.

[0044] Pre-defogger is performed by the first-stage ridge demister 21 and the second-stage ridge demister 22, and fine defogger is then performed by the defogger device to further improve the dust removal and demisting performance of the absorption tower 1. Under the premise of ensuring the droplet concentration at the outlet of the absorption tower 1, the dust can be effectively removed to meet the ultra-low emission requirements, which has important environmental and social significance.

[0045] Of course, the absorption tower 1 can also eliminate the first-level ridge demister 21 and the second-level ridge demister 22, and only use the demister device to remove dust and mist, such as Figure 5 As shown, in this embodiment, two layers of spiral defogger devices are provided. Of course, multiple layers of defogger devices can also be provided according to specific circumstances, which is not specifically limited here.

[0046] The embodiments of the present invention are described in detail above in conjunction with 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 still fall within the protection scope of the present invention.

Claims

1. A spiral dust and mist remover, characterized in that: include: A cylinder body, wherein a hollow cavity with two ends connected for smoke to pass through is provided in the cylinder body; An inner spiral portion, the inner spiral portion being detachably connected to the hollow cavity; an outer spiral portion, the outer spiral portion being detachably connected to the inner spiral portion; The spiral path of the inner spiral portion is different from the spiral path of the outer spiral portion; The inner spiral portion includes a plurality of spiral strips; the plurality of spiral strips are spaced apart and connected to the wall of the hollow cavity, and cooperate with the inner wall surface of the hollow cavity to form a spiral water collecting trough; The outer spiral part comprises a spiral blade and a rod body; the spiral blade is arranged around the rod body; the outer surface of the spiral blade is connected to the wall of a plurality of spiral strips of the spiral water collecting trough; The spiral directions of the spiral water collecting trough and the spiral blade are opposite.

2. The spiral dust and mist remover according to claim 1, characterized in that: The rod body is provided with a through hole which is communicated with an external cleaning device.

3. The spiral dust and mist remover according to claim 1, characterized in that: The cylinder, the inner spiral portion and the outer spiral portion are made of polypropylene plastic or fiber reinforced plastic.

4. A demisting device, characterized in that: It comprises a filter plate and a plurality of spiral dust collectors and demisters as described in any one of claims 1 to 3; the filter plate is provided with a plurality of accommodating through holes for accommodating the spiral dust collectors and demisters; the spiral dust collectors and demisters are arranged in the accommodating through holes.

5. An absorption tower, characterized in that: A demisting device as claimed in claim 4 is provided.

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