CN107537691B - Polar plate for realizing uniform distribution of water films and wet electrostatic dust collector - Google Patents
Polar plate for realizing uniform distribution of water films and wet electrostatic dust collector Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
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- 238000009826 distribution Methods 0.000 claims abstract description 16
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- 239000012719 wet electrostatic precipitator Substances 0.000 claims description 9
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Abstract
The invention discloses a polar plate for realizing uniform distribution of water films and a wet electrostatic dust collector, wherein the polar plate is composed of at least two polar plate regions, the surface of any polar plate region is provided with twill textures, the twill textures on the surface of any polar plate region are parallel to each other, and the horizontal distances between the twill textures are equal; the directions of the twill textures on the surfaces of two adjacent polar plate areas are opposite, and the angles of the twill textures refer to acute angle direction angles; wherein, the angle of twill texture is the contained angle of twill texture and weft direction. The invention improves the surface characteristics of the wet electrode plate, reduces the water consumption of flushing water, realizes the uniform distribution of the water film under the condition of small water distribution and further ensures the high-efficiency dust removal efficiency.
Description
Technical Field
The invention belongs to the field of cleaning polar plates, and particularly relates to a polar plate for realizing uniform distribution of water films and a wet electrostatic dust collector.
Background
In recent years, wet-type electric dust collectors are widely popularized and applied with the development of 'ultra-low emission' modification of pollutants in China. The wet electric dust collector is used for treating micro-particlesNovel dust removal equipment for measuring dust and microparticles, which is mainly used for removing dust, acid mist, water drops, aerosol, odor and PM in moisture-containing gas2.5And the like, and is an ideal device for treating the atmospheric dust pollution. The wet electric dust collector is usually called WESP for short, and the basic principle of dust collection of the dry electric dust collector is the same, the dust is charged by high-voltage corona discharge, and the charged dust reaches a dust collecting plate/pipe under the action of an electric field force and is subjected to three stages of charging, collecting and dust removing. The wet electric dust remover adopts liquid to wash the surface of a dust collecting electrode to remove ash, and can effectively collect fine Particulate Matters (PM)2.5Dust, SO3Acid mist, aerosol), heavy metals (Hg, As, Se, Pb, Cr), organic pollutants (polycyclic aromatic hydrocarbons, dioxins), and the like. The smoke dust emission in the wet smoke can reach 10mg/m after the wet electric dust collector is used3Even 5mg/m3The dust collecting performance is irrelevant to dust characteristics, and the method is suitable for treating wet flue gas, especially for treating the wet flue gas after wet desulphurization in power plants and steel plants, but the equipment investment cost is high, and the method needs to be matched with other dust removing equipment for use, and the investment technology economy and the operation cost of the method need to be integrally evaluated.
The wet electrostatic precipitator (hereinafter referred to as "wet electric") generally treats wet saturated flue gas after wet desulfurization, and reduces the content of acid mist and fine particulate matters in the flue gas to enable the particulate matters in the outlet flue gas to reach an ultra-low index or even a lower index. According to different forms of the anode dust collecting polar plate, wet electricity can be divided into flexible polar plate wet electricity and rigid polar plate wet electricity. The polar plate is used as a wet electric dust collecting electrode, and whether the water films are efficiently and uniformly distributed on the polar plate directly influences the removal efficiency of wet electricity on particulate matters.
For the flexible polar plate, the polar plate generally selects a fiber fabric, the fiber fabric is woven by yarns and mostly adopts twill weave, and the surface of the fabric presents textures with certain twill angles. This produces the following adverse effects: in the engineering application process, water flow on the surface of the polar plate flows at a certain angle under the flow guide effect of the textures, and the water film is deviated to one side of the polar plate at the lower half part of the polar plate, as shown in fig. 1, the water film covering the whole surface of the polar plate is difficult to form, and dust deposition is formed in an area without the water film, so that the dust removal efficiency is influenced.
For a rigid polar plate, the surface of the polar plate is smooth and has no texture structure, however, due to the lack of flow guiding effect, water easily forms branch-shaped channeling on the surface of the polar plate, and a water film covering the whole surface of the polar plate is difficult to form.
Due to the surface physical characteristics of the two polar plates, a larger amount of washing water is needed in actual engineering to form a water film covering the whole surface to finish ash removal, so that the water consumption of wet electricity and the related electricity consumption, alkali consumption and the like are increased. In order to meet the requirements of more complex flue gas purification with large concentration change of particulate matters, a polar plate is urgently needed to reduce the water consumption of washing water, realize water film uniform distribution under the condition of small water distribution and further ensure high-efficiency dust removal efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the first aspect of the embodiment of the invention provides a polar plate for realizing uniform distribution of water films, which improves the surface characteristics of a wet electrode plate, reduces the water consumption of flushing water, realizes uniform distribution of the water films under the condition of small-water-amount water distribution, and further ensures high-efficiency dust removal efficiency.
The polar plate for realizing uniform distribution of the water film is composed of at least two polar plate areas, the surface of any polar plate area is provided with twill textures, the twill textures on the surface of any polar plate area are parallel to each other, and the horizontal distances between the twill textures are equal; the directions of the twill textures on the surfaces of two adjacent polar plate areas are opposite, and the angles of the twill textures refer to acute angle direction angles; wherein, the angle of twill texture is the contained angle of twill texture and weft direction.
With reference to the first aspect of the embodiments, in a first implementation manner of the first aspect of the embodiments of the present invention, angles of the twill textures on the surfaces of two adjacent plate areas are equal.
In this embodiment, the angles of the twill textures on the surfaces of two adjacent polar plate regions are set to be equal angles, so that the flow velocity and the direction of the water film on the surface of each polar plate region can be ensured to be the same, and the water film can be uniformly distributed on the surface of each polar plate region.
With reference to the first aspect of the embodiments, in the second implementation manner of the first aspect of the embodiments, in each polar plate region, the larger the angle of the twill texture is, the larger the distance in the warp direction is, the smaller the horizontal distance between the twill textures is, and the more serious the water film drift is.
With reference to the first aspect of the embodiments, in a third implementation manner of the first aspect of the embodiments, when the plate is a flexible plate, the flexible plate is formed by splicing plate areas with corresponding twill textures, or the twill textures on the surface of the flexible plate are made by a weaving machine.
When the polar plate is a flexible polar plate, the twill textures alternate in the left and right directions of the polar plate area, and the twill textures can be realized by setting parameters of a weaving machine or by performing post-processing modes such as cutting and splicing on fabrics.
With reference to the first aspect of the present invention, in a fourth implementation manner of the first aspect of the present invention, when the plate is a flexible plate, the length of the single flexible plate along the warp direction is 3 to 9m, and the length of the single flexible plate along the weft direction is 350 to 450mm, the length of the surface of any plate region along the warp direction is 0.5 to 1.2m, the angle range of the twill texture is 45 to 70 °, and the horizontal distance between the twill textures is 0.1 to 1 mm.
Wherein the preferable range of the horizontal distance between the twill textures is 0.2-0.5 mm.
The parameters of the flexible polar plate can slow down the bias flow of the water film to the maximum extent based on the properties of the flue gas and the concentration requirement of the outlet particulate matters of the wet electrostatic dust collector, and ensure that the water film exists in the area above 90 percent of the surface of the flexible polar plate, thereby ensuring the dust deposition removing effect of the water film on the polar plate.
In combination with the first aspect of the embodiment of the present invention, in a fifth implementation manner of the first aspect of the embodiment of the present invention, when the plate is a rigid plate, the twill texture on the surface of the rigid plate is processed by a machine tool or formed by pultrusion through a die.
In this embodiment, the rigid plate can be made of glass fiber reinforced plastic or stainless steel. When the metal plate is made of stainless steel, the twill grains are alternated in the left and right directions of the polar plate area and can be processed by a numerical control machine tool such as a milling machine; when the polar plate is made of glass fiber reinforced plastic, the twill textures are alternated in the left and right directions of the polar plate area, and the polar plate can be formed by setting the parameters of the mold and performing pultrusion.
With reference to the first aspect of the embodiments, in a sixth implementation manner of the first aspect of the embodiments, when the plate is a rigid plate, the heights of the protrusions of the twill grain textures in all plate areas are equal.
In this embodiment, the protruding height of the twill texture in all polar plate regions sets up to be equal, can guarantee that the water film is the same at each polar plate regional surface velocity of flow and direction, is favorable to the water film at the regional surperficial evenly distributed of each polar plate.
In a sixth implementation manner combined with the first aspect of the embodiment of the present invention, when the plate is a rigid plate and the length of a single rigid plate along the warp direction is 4-8 m, the length of any plate region surface along the warp direction is 1-2 m, the angle range of the twill texture is 45-75 °, the horizontal distance range between the twill textures is 0.1-1 mm, and the protrusion height range of the twill texture is 0.05-0.2 mm.
The preferred length range of the single rigid polar plate along the warp direction is 5-7 m;
the preferable range of the horizontal distance between the twill textures is 0.2-0.5 mm.
The parameters of the rigid polar plate can slow down the bias flow of the water film to the maximum extent based on the properties of the flue gas and the concentration requirement of particulate matters at the outlet of the wet electrostatic dust collector, and ensure that the water film exists in the area above 90 percent of the surface of the rigid polar plate, thereby ensuring the cleaning effect of the water film on the dust deposit on the polar plate.
A second aspect of an embodiment of the present invention provides a wet electrostatic precipitator.
The wet electrostatic dust collector comprises two structural forms, wherein the first structure is as follows:
a second aspect of the embodiment of the present invention provides a wet electrostatic precipitator, including a polar plate that realizes uniform water film distribution as described in any one of the first aspect of the embodiment of the present invention to the fourth aspect of the first aspect of the embodiment of the present invention.
The second structure is as follows:
a second aspect of the embodiment of the present invention provides a wet electrostatic precipitator, including the plate for realizing uniform distribution of water films described in any one of the first to second embodiments of the first aspect of the embodiment of the present invention and the fifth to sixth embodiments of the first aspect of the embodiment of the present invention.
Compared with the prior art, the invention has the beneficial effects that:
(1) aiming at the flexible polar plate, the stripe texture is presented in a left/right or right/left alternating mode, so that the bias flow phenomenon caused by single texture direction is avoided; for the rigid polar plate, stripes which are alternated in the left and right directions are added on the surface of the rigid polar plate, the flow guide effect on a water film on the surface can be achieved, and the branch-shaped bias flow is effectively avoided.
(2) According to the invention, through the change of the surface structure of the wet electrode plate, the uniform distribution of the water film on the dust collecting polar plate is realized under the condition of less water distribution, so that on one hand, the ash removal effect can be improved, on the other hand, the washing with large water amount is avoided, and the generation amount of waste water is reduced to a greater extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of a conventional flexible plate water film formation;
FIG. 2 is a schematic diagram of a flexible plate structure of the present invention;
fig. 3 is a schematic diagram of the rigid plate structure of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to solve the problems of poor water film uniform distribution effect and large water consumption for washing of the wet electric dust collection electrode plate in the background art, the embodiment of the invention provides the electrode plate for realizing uniform water film distribution.
The polar plate for realizing uniform distribution of the water film provided by the embodiment of the invention is composed of at least two polar plate areas, the surface of any polar plate area is provided with twill textures, the twill textures on the surface of any polar plate area are parallel to each other, and the horizontal distances between the twill textures are equal; the directions of the twill textures on the surfaces of two adjacent polar plate areas are opposite, and the angles of the twill textures refer to acute angle direction angles; wherein, the angle of twill texture is the contained angle of twill texture and weft direction.
In a specific embodiment, the angles of the twill textures on the surfaces of two adjacent plate areas are equal.
In this embodiment, the angles of the twill textures on the surfaces of two adjacent polar plate regions are set to be equal angles, so that the flow velocity and the direction of the water film on the surface of each polar plate region can be ensured to be the same, and the water film can be uniformly distributed on the surface of each polar plate region.
In a specific embodiment, in each polar plate area, the larger the angle of the twill texture is, the larger the distance in the warp direction is, the smaller the horizontal distance between the twill textures is, and the more serious the water film drift is.
When the plate is a flexible plate:
for the flexible polar plate, the polar plate is woven by warp and weft yarn twill, and in the warp direction, the twill texture is presented in a left-right oblique mode or a right-left oblique mode.
And the flexible polar plate is formed by splicing polar plate areas with corresponding twill textures, or the twill textures on the surface of the flexible polar plate are made by a weaving machine.
When the polar plate is a flexible polar plate, the twill textures alternate in the left and right directions of the polar plate area, and the twill textures can be realized by setting parameters of a weaving machine or by performing post-processing modes such as cutting and splicing on fabrics.
As shown in FIG. 1, in the first plate area surface, the warp direction is at a distance d from the upper tip of the plate11Inner twill inclines leftwards and rightwards, and the included angle between the twill and the weft direction is α11(acute angular direction);
a length distance d in the warp direction in the second plate region surface12The inner twill is changed into right/left oblique, and the included angle between the twill and the weft is α12(acute angle direction), the left and right oblique directions or the right and left oblique directions are repeated in the length direction of the polar plate.
Based on the properties of the flue gas and the concentration requirement of the particles at the outlet of the wet electrostatic dust collector, when the length d of the single flexible polar plate along the warp direction14The range is 3-9 m, preferably 5.5-7.5 m; length d in the weft direction15When the range is 350-450 mm:
length d of the first plate region surface along the warp direction11The length d of the surface of the second plate region along the warp direction is in the range of 0.5-1.2 m12The range is 0.5-1.2 m;
angle α of twill grain in the surface of the first plate area11Ranging from 45 to 70 degrees, angle α of the twill grain in the second plate area surface12The range is also 45-70 degrees.
Horizontal distance d between twill textures in the first polar plate region and the second polar plate region13The range is 0.1 to 1 mm. Wherein the horizontal distance d between the twill textures13The preferable range is 0.2-0.5 mm.
In the preferred embodiment, the distance d is in the warp direction from the top of the plate11Within 600mmThe twill inclines leftwards, and the included angle between the twill and the weft direction is α1165 ° (acute angular direction); next distance d12Within 600mm, the twill is changed into right slant, and the included angle between the twill and the weft direction is α12The left and right skews were repeated 3 times in the longitudinal direction of the plate at 65 ° (acute angle direction).
The length d of the single flexible polar plate is based on the properties of the flue gas and the concentration requirement of the particles at the outlet of the wet electrostatic dust collector146.5 m; width d of single plate15440 mm. Horizontal distance d between textures13Is 0.2 mm.
The parameters of the flexible polar plate can slow down the bias flow of the water film to the maximum extent based on the properties of the flue gas and the concentration requirement of the outlet particulate matters of the wet electrostatic dust collector, and ensure that the water film exists in the area above 90 percent of the surface of the flexible polar plate, thereby ensuring the dust deposition removing effect of the water film on the polar plate.
Aiming at the flexible polar plate, the stripe texture is presented in a left/right or right/left alternating mode, so that the bias flow phenomenon caused by single texture direction is avoided;
according to the invention, through the change of the surface structure of the wet electrode plate, the uniform distribution of the water film on the dust collecting polar plate is realized under the condition of less water distribution, so that on one hand, the ash removal effect can be improved, on the other hand, the washing with large water amount is avoided, and the generation amount of waste water is reduced to a greater extent.
(II) when the polar plate is a rigid polar plate:
the twill texture on the surface of the rigid polar plate is processed by a machine tool or formed by pultrusion through a mould.
In this embodiment, the rigid plate can be made of glass fiber reinforced plastic or stainless steel. When the metal plate is made of stainless steel, the twill grains are alternated in the left and right directions of the polar plate area and can be processed by a numerical control machine tool such as a milling machine; when the polar plate is made of glass fiber reinforced plastic, the twill textures are alternated in the left and right directions of the polar plate area, and the polar plate can be formed by setting the parameters of the mold and performing pultrusion.
In a specific embodiment, when the plate is a rigid plate, the raised height of the twill grain in all plate areas is equal.
In this embodiment, the protruding height of the twill texture in all polar plate regions sets up to be equal, can guarantee that the water film is the same at each polar plate regional surface velocity of flow and direction, is favorable to the water film at the regional surperficial evenly distributed of each polar plate.
As shown in fig. 2, the surface of the rigid plate is provided with raised stripes with a certain inclination angle, and the texture of the stripes is presented in a left-right oblique manner or a right-left oblique manner.
In an embodiment, when the plates are rigid plates, the length d of the single rigid plate along the warp direction is based on the properties of the flue gas and the concentration requirement of the particles at the outlet of the wet electrostatic precipitator24When the range is 4-8 m, the preferable length d of the single rigid polar plate along the warp direction24The range is 5-7 m;
length d of the first plate region surface along the warp direction21The length d of the surface of the second plate region along the warp direction is 1-2 m21The range is also 1-2 m, and the angle α of the twill grain in the surface of the first plate area21Is 45-75 degrees, and the angle α of the twill texture in the surface of the second plate area22Also 45-75 degrees.
Horizontal distance d between twill textures in the first polar plate region and the second polar plate region23The range is 0.1 to 1mm, and the preferable range is 0.2 to 0.5 mm.
The protrusion height d of the twill texture in the first and second plate regions25The range is 0.05-0.2 mm.
In one embodiment, the distance d from the top of the plate in the up-down direction21The twill inclines leftwards within 1m, and the included angle between the twill and the weft direction is α2160 ° (acute angular direction); next distance d22Within 1m, the twill is changed into right slant, and the included angle between the twill and the weft direction is α22The left and right inclinations are repeated 2 times in the length direction of the plate at 60 ° (acute angle direction). The length d of the single polar plate is based on the properties of the flue gas and the concentration requirement of the particles at the outlet of the wet electrostatic dust collector246 m; the distance d between the textures230.3mm, height d of the twill projection25＝0.05mm。
The parameters of the rigid polar plate can slow down the bias flow of the water film to the maximum extent based on the properties of the flue gas and the concentration requirement of particulate matters at the outlet of the wet electrostatic dust collector, and ensure that the water film exists in the area above 90 percent of the surface of the rigid polar plate, thereby ensuring the cleaning effect of the water film on the dust deposit on the polar plate.
For the rigid polar plate, stripes which are alternated in the left and right directions are added on the surface of the rigid polar plate, the flow guide effect on a water film on the surface can be achieved, and the branch-shaped bias flow is effectively avoided.
According to the invention, through the change of the surface structure of the wet electrode plate, the uniform distribution of the water film on the dust collecting polar plate is realized under the condition of less water distribution, so that on one hand, the ash removal effect can be improved, on the other hand, the washing with large water amount is avoided, and the generation amount of waste water is reduced to a greater extent.
The embodiment of the invention also provides a wet electrostatic dust collector.
The wet electrostatic precipitator comprises two structural forms, wherein:
the first kind of wet electrostatic precipitator includes polar plates with uniformly distributed water films as shown in FIG. 2.
The second wet electrostatic precipitator comprises polar plates for realizing uniform water film distribution as shown in figure 3.
According to the invention, through the change of the surface structure of the wet electrode plate, the uniform distribution of the water film on the dust collecting polar plate is realized under the condition of less water distribution, so that on one hand, the ash removal effect can be improved, on the other hand, the washing with large water amount is avoided, and the generation amount of waste water is reduced to a greater extent.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A polar plate for realizing uniform distribution of water films is characterized in that the polar plate is composed of at least two polar plate regions, the surface of any polar plate region is provided with twill textures, the twill textures on the surface of any polar plate region are parallel to each other, and the horizontal distances between the twill textures are equal; the directions of the twill textures on the surfaces of two adjacent polar plate areas are opposite, and the angles of the twill textures refer to acute angle direction angles; the angle of the twill texture is an included angle between the twill texture and the weft direction, and the range of the protrusion height of the twill texture is 0.05-0.2 mm;
when the polar plates are flexible polar plates, the length range of a single flexible polar plate along the warp direction is 3-9 m, and the length range of the single flexible polar plate along the weft direction is 350-450 mm, the length range of the surface of any polar plate area along the warp direction is 0.5-1.2 m, the angle range of twill textures is 45-70 degrees, and the horizontal distance range between the twill textures is 0.1-1 mm;
when the polar plate is a rigid polar plate, the length range of a single rigid polar plate along the warp direction is 4-8 m, the length range of the surface of any polar plate region along the warp direction is 1-2 m, the angle range of the twill texture is 45-75 degrees, and the horizontal distance range between the twill textures is 0.1-1 mm.
2. The polar plate for realizing uniform water film distribution according to claim 1, wherein the angles of the twill textures on the surfaces of two adjacent polar plate areas are equal.
3. The polar plate for realizing uniform water film distribution according to claim 1, wherein in each polar plate area, the larger the angle of the twill grains is, the larger the distance in the warp direction is, the smaller the horizontal distance between the twill grains is, and the more serious the water film drift is.
4. The polar plate for realizing uniform water film distribution of claim 1, wherein when the polar plate is a flexible polar plate, the flexible polar plate is formed by splicing polar plate areas with corresponding twill textures, or the twill textures on the surface of the flexible polar plate are made by a weaving machine.
5. The polar plate for realizing uniform water film distribution of claim 1, wherein when the polar plate is a rigid polar plate, the twill texture on the surface of the rigid polar plate is formed by machine tool machining or die pultrusion.
6. The polar plate for realizing uniform water film distribution according to claim 1, wherein when the polar plate is a rigid polar plate, the raised height of the twill grain in all polar plate areas is equal.
7. A wet electrostatic precipitator comprising the plate for achieving uniform water film distribution as claimed in any one of claims 1 to 6.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710763515.0A CN107537691B (en) | 2017-08-30 | 2017-08-30 | Polar plate for realizing uniform distribution of water films and wet electrostatic dust collector |
| PCT/CN2018/085963 WO2019019762A1 (en) | 2017-07-25 | 2018-05-08 | Fabric substrate and flue gas co-purification device |
| EP18837745.1A EP3659709A4 (en) | 2017-07-25 | 2018-05-08 | Fabric substrate and flue gas co-purification device |
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| CN201710763515.0A CN107537691B (en) | 2017-08-30 | 2017-08-30 | Polar plate for realizing uniform distribution of water films and wet electrostatic dust collector |
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| CN107537691B true CN107537691B (en) | 2020-03-17 |
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| JPH08155337A (en) * | 1994-11-30 | 1996-06-18 | Hitachi Plant Eng & Constr Co Ltd | Electrostatic precipitator |
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