Combined air flow distribution plate suitable for super-high type electric dust collector

Abstract

The application discloses a combined airflow distribution plate suitable for an ultrahigh electric dust collector, which comprises a first distribution plate, a second distribution plate and a third distribution plate; the first distribution plate is a convex bottom inclined plane structure, the convex bottom is a plane A1, and the plane A1 and the inclined plane are both provided with air holes; the second distribution plate is also a convex bottom inclined plane structure, the convex bottom is a plane A2, the plane A2 and the inclined plane are both provided with air holes, and a first flue gas speed reduction pipe is arranged at the outlet position of the air hole on the plane A2; the third distribution plate is a concave bottom inclined plane structure, the concave bottom is a plane A3, the plane A3 is provided with air holes, and the inclined plane is not provided with air holes. The combined distribution plate with the convex and concave surface structure has low airflow resistance, the flue gas speed is adjusted through the flue gas speed reduction pipe and the flue gas speed increase pipe, the airflow in the electric field is distributed according to the uniform airflow speed standard, and the dust removal efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrostatic precipitation, in particular to a combined airflow distribution plate suitable for an ultra-high electrostatic precipitator. BACKGROUND

[0002] At present, the structure design of the airflow distribution plate of the domestic ultra-high electrostatic precipitator mostly adopts a flat plate type, which is installed in the air inlet tank, and the number of arrangements mostly adopts three layers. After the flue gas passes through the airflow distribution plate and enters the electric field, the overall airflow velocity presents a distribution of low in the middle and high at the periphery, the airflow distribution is uneven, and a high flow velocity zone and a low flow velocity zone are formed in the local area of the electric field and vortexes exist, which reduces the dust collection effect. On the other hand, uneven airflow distribution will lead to regional accumulation of dust particles in the internal area of the electrostatic precipitator, blockage of the pore diameter of the airflow distribution plate, further destruction of the uniformity of the airflow distribution, and vicious cycle. Therefore, a combined airflow distribution plate suitable for an ultra-high electrostatic precipitator is developed. The combined airflow distribution plate adopts a structure of combination of convex and concave surfaces and is supplemented with a flue gas speed-up pipe and a flue gas speed-reducing pipe, has relatively low airflow resistance, and the overall airflow distribution tends to be uniform, which is beneficial to realize the distribution of the flue gas in the entire electric field section according to the uniform airflow velocity standard and has a positive significance for further exerting the high-efficiency dust collection effect of the electrostatic precipitator. SUMMARY

[0003] The purpose of the present application is to provide a combined airflow distribution plate suitable for an ultra-high electrostatic precipitator, which is installed in the air inlet tank of the electrostatic precipitator, adopts a combined mode of combination of convex and concave surfaces, has relatively low airflow resistance and can adjust the flow velocity of the flue gas entering the electric field, realizes the distribution of the airflow in the electric field according to the uniform airflow velocity standard, and further exerts the high-efficiency dust collection effect of the electrostatic precipitator.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a combined airflow distribution plate suitable for an ultra-high electrostatic precipitator, comprising a first distribution plate, a second distribution plate and a third distribution plate which are sequentially arranged from left to right and are installed in an air inlet tank of the electrostatic precipitator, wherein the first distribution plate is arranged close to an air inlet of the air inlet tank of the electrostatic precipitator.

[0005] The first distribution plate is a convex bottom inclined surface structure, the convex bottom is a plane A1, and the plane A1 and the inclined surface are both provided with air holes;

[0006] The second distribution plate is a convex bottom inclined surface structure, the convex bottom is a plane A2, and the plane A2 and the inclined surface are both provided with air holes, and a first flue gas speed-reducing pipe is arranged at the outlet position of the air holes on the plane A2;

[0007] The third distribution plate is a concave bottom inclined plane structure, the concave bottom is a plane A3, air holes are arranged on the plane A3, the inclined plane is free of air holes, the plane A3 is divided into an upper flue gas speed reduction area A31, a middle flue gas speed increasing area A32 and a lower flue gas speed reduction area A33 from top to bottom, and a second flue gas speed reduction pipe is arranged at the outlet position of the air hole on the upper flue gas speed reduction area A31 and the lower flue gas speed reduction area A33, and a flue gas speed increasing pipe is arranged at the outlet position of the air hole on the middle flue gas speed increasing area A32.

[0008] As a preferred embodiment in the embodiment, the included angle a1 between the plane A1 of the first distribution plate and the inclined plane is ≤8°, the area of the plane A1 accounts for 18-20% of the total area of the first distribution plate 1, the opening rate is ≥50%, the area of the inclined plane accounts for 80-82% of the total area of the first distribution plate 1, the opening rate is ≥40%, the central axis of the air hole on the plane A1 is perpendicular to the plane A1, and the central axis of the air hole on the inclined plane is perpendicular to the inclined plane.

[0009] As a preferred embodiment in the embodiment, the included angle a2 between the plane A2 of the second distribution plate and the inclined plane is ≤8°, the area of the plane A2 accounts for 32-35% of the total area of the second distribution plate, the opening rate is ≥50%, the area of the inclined plane accounts for 65-68% of the total area of the second distribution plate, the opening rate is ≥40%, the central axis of the air hole on the plane A2 is perpendicular to the plane A2, and the central axis of the air hole on the inclined plane is perpendicular to the inclined plane.

[0010] As a preferred embodiment in the embodiment, the included angle a3 between the plane A3 of the third distribution plate and the inclined plane is ≥30°, the central axis of the air hole on the plane A3 is perpendicular to the plane A3, the area of the plane A3 accounts for 94-96% of the total area of the third distribution plate, the area of the upper flue gas speed reduction area A31 accounts for 18-20% of the total area of the plane A3, the opening rate is ≥30%, the area of the middle flue gas speed increasing area A32 accounts for 60-64% of the total area of the plane A3, the opening rate is ≥40%, and the area of the lower flue gas speed reduction area A33 accounts for 18-20% of the total area of the plane A3, the opening rate is ≥30%.

[0011] As a preferred embodiment in the embodiment, the central axis of the first flue gas speed reduction pipe is consistent with the central axis of the corresponding air hole, the inlet pipe diameter of the first flue gas speed reduction pipe is the same as the pipe diameter of the air hole, the outlet pipe diameter is 1.10-1.15 times the inlet pipe diameter, and the length is ≤60mm.

[0012] The central axis of the second flue gas speed reduction pipe is consistent with the central axis of the corresponding air hole, the inlet pipe diameter of the second flue gas speed reduction pipe is the same as the pipe diameter of the air hole, the outlet pipe diameter is 1.05-1.10 times of the inlet pipe diameter, and the length is less than or equal to 60 mm.

[0013] The central axis of the flue gas speed increasing pipe is consistent with the central axis of the corresponding air hole, the inlet pipe diameter of the flue gas speed increasing pipe is the same as the pipe diameter of the air hole, the outlet pipe diameter is 0.90-0.95 times of the inlet pipe diameter, and the length is less than or equal to 60 mm.

[0014] As a preferred embodiment in the embodiment, the mounting spacing of the first distribution plate and the second distribution plate is L1, the mounting spacing of the second distribution plate and the third distribution plate is L2, and L2 is greater than (2-2.5) L1.

[0015] As a preferred embodiment in the embodiment, the first distribution plate, the second distribution plate and the third distribution plate are selected from plate materials, and the plate material has a thickness of 4-6 mm and is made of carbon steel or low alloy steel.

[0016] The first flue gas speed reduction pipe, the second flue gas speed reduction pipe and the flue gas speed increasing pipe are made of carbon steel or low alloy steel, and the wall thickness of the pipe material is 3.5-4 mm.

[0017] In summary, the technical effects and advantages of the application are as follows:

[0018] The application has the following advantages: the first distribution plate and the second distribution plate adopt convex bottom inclined surface structures, the airflow distribution area is increased, the airflow speed distribution trend is changed, the flow speed of the flue gas around the periphery is reduced, the kinetic energy of the flue gas in the middle region is enhanced, the influence of the turbulence generated in the acute angle region formed by the first distribution plate, the second distribution plate and the inlet box on the airflow distribution is inhibited and weakened, the air chamber volume between the second distribution plate and the third distribution plate is increased, the flue gas speed in the middle region of the second distribution plate is reduced through the first flue gas speed reduction pipe, which is beneficial to the uniform flow of the flue gas in the air chamber, the inclined surface of the third distribution plate is not provided with an air hole, part of the flue gas is prevented from deviating to the electric field region and the upper part of the ash bucket which cannot generate dust removal effect, the flue gas speed at the outlet of the combined airflow distribution plate is adjusted through the second flue gas speed reduction pipe and the flue gas speed increasing pipe, the overall airflow distribution trend is uniform, which is beneficial to the realization of the uniform airflow speed standard distribution of the flue gas in the entire electric field cross section, and the dust removal efficiency of the super-high type electric dust collector is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0020] Figure 1 Structure diagram of combined air flow distribution plate of the present application;

[0021] Figure 2 Structure diagram of Figure 1 Structure diagram of first distribution plate in front view and right view;

[0022] Figure 3 Structure diagram of Figure 1 Structure diagram of second distribution plate in front view and right view;

[0023] Figure 4 Structure diagram of Figure 1 Structure diagram of third distribution plate in front view and right view.

[0024] In the figure: 1, first distribution plate; 2, second distribution plate; 3, third distribution plate; 4, first flue gas speed reduction pipe; 5, second flue gas speed reduction pipe; 6, flue gas speed increase pipe; 7, air hole; 8, electric dust collector air inlet tank. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Embodiment: refer to Figures 1-4 The combined air flow distribution plate suitable for super-high electric dust collector shown in the figure comprises a first distribution plate 1, a second distribution plate 2 and a third distribution plate 3 which are sequentially arranged from left to right and installed in the electric dust collector air inlet tank, and the first distribution plate 1 is arranged close to the air inlet of the electric dust collector air inlet tank.

[0027] The first distribution plate 1 is a convex bottom inclined surface structure, the convex bottom is a plane A1, and the plane A1 and the inclined surface are both provided with air holes 7;

[0028] The second distribution plate 2 is a convex bottom inclined surface structure, the convex bottom is a plane A2, and the plane A2 and the inclined surface are both provided with air holes 7, and the first flue gas speed reduction pipe 4 is arranged at the outlet position of the air hole 7 on the plane A2;

[0029] The third distribution plate 3 is a concave bottom inclined surface structure, the concave bottom is a plane A3, the plane A3 is provided with air holes 7, the inclined surface is not provided with air holes 7, the plane A3 is divided into an upper flue gas speed reduction area A31, a middle flue gas speed increasing area A32 and a lower flue gas speed reduction area A33 from top to bottom, the second flue gas speed reduction pipes 6 are arranged at the outlet positions of the air holes 7 in the upper flue gas speed reduction area A31 and the lower flue gas speed reduction area A33, and the flue gas speed increasing pipes 6 are arranged at the outlet positions of the air holes in the middle flue gas speed increasing area A32.

[0030] The first distribution plate 1 and the second distribution plate 2 adopt convex bottom inclined surface structures, the air flow distribution area is increased, the air flow speed distribution trend is changed, the flow speed of the flue gas around is reduced, the kinetic energy of the flue gas in the middle area is enhanced, the influence of the turbulence generated in the acute angle area formed by the first distribution plate 1 and the second distribution plate 2 and the air inlet box on the air flow distribution is inhibited and weakened, the air chamber volume between the second distribution plate 2 and the third distribution plate 3 is increased, the air speed of the flue gas in the middle area of the second distribution plate 2 is reduced through the first flue gas speed reduction pipe 4, which is beneficial to the uniform flow of the flue gas in the air chamber, the inclined surface of the third distribution plate 3 is not provided with air holes, part of the flue gas is prevented from deviating to the electric field area and the upper part of the ash bucket which cannot produce dust removal effect, the air speed of the flue gas in the upper area and the lower area of the third distribution plate 3 is reduced through the second flue gas speed reduction pipe 5, the air speed of the flue gas in the middle area of the third distribution plate 3 is increased through the flue gas speed increasing pipe 6, the flue gas passes through the combined air flow distribution plate, the overall air flow distribution trend is uniform, and the air flow distribution state of low in the middle and high around is no longer generated. The combined distribution plate adopting the convex and concave surface structure combination has low air flow resistance, the overall air flow distribution trend is uniform, which is beneficial to the realization of the uniform air flow speed standard distribution of the flue gas in the whole electric field section, and the dust removal efficiency of the super-high type electric dust collector is improved.

[0031] It should be noted that, first, the ultra-high electrostatic precipitator referred to in the present application refers to an electrostatic precipitator with a plate height in the electric field of 18 m or more; second, the first distribution plate 1 is a convex bottom inclined plane structure, the middle region is a convex bottom plane, and the peripheral region is an inclined plane; the second distribution plate 2 is a convex bottom inclined plane structure, the middle region is a convex bottom plane, and the peripheral region is an inclined plane; the third distribution plate 3 is a concave bottom inclined plane structure, the middle region is a concave bottom plane, and the peripheral region is an inclined plane; third, taking the technical upgrading and transformation of a unit's electrostatic precipitator with a dust removal area of 168 m2 as an example, the plate height is 18 m, the combined airflow distribution plate of the application is used to replace the original 3-layer flat plate structure airflow distribution plate, which is vertically installed in the inlet gas tank of the electrostatic precipitator, the inlet gas tank has a 90° conical horn opening, the electrostatic precipitator flue gas volume is 540,000 m3 / h, the flue gas temperature is ≤160℃, the flue gas dust content is 4-5 g / m3, the simulation test results show that the inlet flue gas flow rate is 12.5 m / s, at the 0.5 m cross section of the first electric field inlet, the relative root mean square value δ of the flat plate structure airflow distribution plate is 0.263, the airflow distribution is unqualified, after using the combined airflow distribution plate of the present embodiment, δ≤0.15, the airflow distribution is good. After the electrostatic precipitator is put into operation, the actual detection results show that the outlet flue gas dust content is <35 mg / m3, and the dust removal efficiency is >99%.

[0032] As a preferred embodiment in the present embodiment, as shown in Figure 2 The angle a1 between the plane A1 of the first distribution plate 1 and the inclined plane is ≤8°, the area of the plane A1 accounts for 18-20% of the total area of the first distribution plate 1, the opening rate is ≥50%, the area of the inclined plane accounts for 80-82% of the total area of the first distribution plate 1, the opening rate is ≥40%, the center axis of the air hole 7 on the plane A1 is perpendicular to the plane A1, and the center axis of the air hole 7 on the inclined plane is perpendicular to the inclined plane.

[0033] The area of the plane A1 of the first distribution plate 1 is smaller than the area of the inclined plane, and the opening rate is ≥50%, which can reduce the loss of kinetic energy of the middle region flue gas and reduce the airflow resistance, the area of the inclined plane accounts for 80-82% of the total area of the first distribution plate 1, and the opening rate is ≥40%, which can increase the airflow distribution area, the angle a1 between the plane A1 and the inclined plane is ≤8°, which can change the flow velocity distribution trend of the flue gas, the flue gas is guided to the middle region and adjusts the airflow distribution state through the air chamber between the first distribution plate 1 and the second distribution plate 2, which can inhibit and weaken the influence of the turbulence generated in the acute angle region formed by the first distribution plate 1 and the inlet gas tank on the airflow distribution, thereby reducing the airflow resistance.

[0034] As a preferred embodiment in the present embodiment, as shown in Figure 3As shown in the figure, the angle a2 between the plane A2 on the second distribution plate 2 and the inclined surface is ≤8°, the area of the plane A2 accounts for 32-35% of the total area of the second distribution plate 2, the opening rate is ≥50%, the area of the inclined surface accounts for 65-68% of the total area of the second distribution plate 2, the opening rate is ≥40%, the central axis of the ventilation hole 7 on the plane A2 is perpendicular to the plane A2, and the central axis of the ventilation hole 7 on the inclined surface is perpendicular to the inclined surface.

[0035] The area of the plane A2 on the second distribution plate 2 accounts for 32-35% of the total area of the second distribution plate 2, which is close to twice the area of the plane A1 on the first distribution plate 1, and the opening rate is ≥50%, which improves the airflow distribution in the air chamber and reduces the airflow resistance. The area of the inclined surface of the second distribution plate 2 accounts for 65-68% of the total area of the second distribution plate 2, the angle a2 is ≤8°, and the inclined surface is parallel to the inclined surface of the first distribution plate 1, which increases the airflow distribution area, further suppresses and weakens the influence of the turbulence generated by the flue gas in the acute angle region formed by the second distribution plate 2 and the air inlet box on the airflow distribution, and reduces the airflow resistance.

[0036] As a preferred embodiment in the present embodiment, as shown in the figure, Figure 3 As shown in the figure, the angle a3 between the plane A3 on the third distribution plate 3 and the inclined surface is ≥30°, the central axis of the ventilation hole 7 on the plane A3 is perpendicular to the plane A3, the area of the plane A3 accounts for 94-96% of the total area of the third distribution plate 3, the area of the upper flue gas speed reduction zone A31 accounts for 18-20% of the entire plane A3 area, the opening rate is ≥30%, the area of the middle flue gas speed increase zone A32 accounts for 60-64% of the entire plane A3 area, the opening rate is ≥40%, and the area of the lower flue gas speed reduction zone A33 accounts for 18-20% of the entire plane A3 area, the opening rate is ≥30%.

[0037] The third distribution plate 3 adopts a concave bottom inclined surface structure, the inclined surface does not open ventilation holes, and part of the flue gas is prevented from deviating to the electric field area and above the ash bucket which cannot produce dust removal effect. The angle a3 between the inclined surface and the plane A3 is ≥30°, a obtuse angle region is formed at the edge of the air inlet box, the flue gas will not form too large turbulence, the inclined surface has no airflow distribution effect, and therefore the area of the plane A3 accounts for 94-96% of the total area of the third distribution plate 3. In order to further change the phenomenon that the overall airflow velocity of the flue gas after entering the electric field presents low in the middle and high at the periphery, and the speed contour on the section presents “annual ring” phenomenon, the plane A3 is divided into an upper flue gas speed reduction zone A31, a middle flue gas speed increase zone A32 and a lower flue gas speed reduction zone A33 from top to bottom. In the present application, combined with the numerical simulation test of the airflow distribution plate of the ultra-high type electric dust collector, the areas of the flue gas speed reduction zones A31 and A33 are the same, both accounting for 18-20% of the area of the plane A3, and the opening rates are both ≥30%. The flue gas speed increase zone A32 accounts for 60-64% of the area of the plane A3, and the opening rate is ≥40%. In addition, the second flue gas speed reduction pipe 5 and the flue gas speed increase pipe 6 are used to adjust the outlet flue gas flow rate of the entire plane A3, and the overall airflow flow rate tends to be uniform.

[0038] As a preferred embodiment in the present embodiment, the central axis of the first flue gas speed reduction pipe 4 is consistent with the central axis of the corresponding air hole 7, the inlet pipe diameter of the first flue gas speed reduction pipe 4 is the same as the pipe diameter of the air hole 7, the outlet pipe diameter is 1.10~1.15 times of the inlet pipe diameter, and the length is ≤60mm;

[0039] The outlet position of the air hole of the entire plane A2 of the second distribution plate 2 is provided with the first flue gas speed reduction pipe 4, the gas speed of the flue gas through the outlet of each first flue gas speed reduction pipe 4 is reduced by 15~20%, thus the gas speed of the flue gas at the outlet of the entire plane A2 area generally presents a downward trend, since the structure of the second distribution plate 2 is a convex bottom inclined plane structure, the flue gas in the peripheral area is deviated to the middle part, by reducing the gas speed at the outlet position of the air hole of the entire plane A2 area, it is avoided that the flue gas speed in some areas in the gas chamber is too large or too small. The first flue gas speed reduction pipe 4 adopts a concentric reducing short pipe, the total length is ≤60mm, the flow resistance of the short pipe is small, the change of the flow speed of the flue gas is small, and the loss of kinetic energy is small.

[0040] The central axis of the second flue gas speed reduction pipe 5 is consistent with the central axis of the corresponding air hole 7, the inlet pipe diameter of the second flue gas speed reduction pipe 5 is the same as the pipe diameter of the air hole 7, the outlet pipe diameter is 1.05~1.10 times of the inlet pipe diameter, and the length is ≤60mm;

[0041] The central axis of the flue gas speed increasing pipe 6 is consistent with the central axis of the corresponding air hole, the inlet pipe diameter of the flue gas speed increasing pipe 6 is the same as the pipe diameter of the air hole 7, the outlet pipe diameter is 0.90~0.95 times of the inlet pipe diameter, and the length is ≤60mm.

[0042] The inlet gas box of the super-high type electric dust collector has a very large cross-sectional area, and the flow speed of the gas flow entering the electric field area generally tends to be uniform, which needs to adjust the outlet cross-sectional flue gas flow speed of the combined gas flow distribution plate again, thus the plane A3 of the third distribution plate 3 is divided into an upper flue gas speed reduction area A31, a middle flue gas speed increasing area A32 and a lower flue gas speed reduction area A33 from top to bottom. The outlet position of the air hole of the entire speed reduction area A31 and A33 is provided with the second flue gas speed reduction pipe 5, the gas speed of the flue gas through the outlet of each second flue gas speed reduction pipe 5 is reduced by 10~15%, thus the gas speed of the flue gas at the outlet of the entire speed reduction area A31 and A33 generally presents a downward trend, while the outlet position of the air hole of the entire flue gas speed increasing area A32 is provided with the flue gas speed increasing pipe 6, the gas speed of the flue gas through the outlet of each flue gas speed increasing pipe 6 is increased by 10~20%, thus the gas speed of the flue gas at the outlet of the entire flue gas speed increasing area A32 generally presents an upward trend, after the flue gas passes through the third distribution plate 3 and is reduced and increased in speed, the flow speed of the gas flow at the entire electric field cross section generally tends to be uniform. The second flue gas speed reduction pipe 5 and the flue gas speed increasing pipe 6 both adopt a concentric reducing short pipe, the total length is ≤60mm, the flow resistance of the short pipe is small, the change of the flow speed of the flue gas is small, and the loss of kinetic energy is small

[0043] As a preferred embodiment in the present embodiment, as shown in Figure 1 The installation interval of the first distribution plate 1 and the second distribution plate 2 is L1, and the installation interval of the second distribution plate 2 and the third distribution plate 3 is L2, L2>(2~2.5)L1.

[0044] Because the distribution plate air hole has a small diameter, after the flue gas passes through the distribution plate, the flue gas flow rate opposite to the small hole is large, the flue gas flow rate between the holes is small, and the airflow in a small range centered on the hole is not uniform. This turbulent state of flue gas flow needs to be gradually stabilized after a distance. The installation interval L1 of the first distribution plate 1 and the second distribution plate 2 and the installation interval L2 of the second distribution plate 2 and the third distribution plate 3 need to meet this condition. In the present application, L2>(2~2.5)L1. On the one hand, the first flue gas speed reduction pipe 4 arranged after the air hole of the second distribution plate 2 plane A2 increases the stable zone of flue gas flow. On the other hand, the increase of L2 also expands the air chamber volume, and the flue gas flow in the air chamber is relatively stable.

[0045] As a preferred embodiment in the present embodiment, the first distribution plate 1, the second distribution plate 2, and the third distribution plate 3 are selected from plate materials, and the plate material thickness is 4~6mm, and the material is carbon steel or low alloy steel.

[0046] The material of the first flue gas speed reduction pipe 4, the second flue gas speed reduction pipe 5, and the flue gas speed increasing pipe 6 is carbon steel or low alloy steel, and the pipe wall thickness is 3.5~4mm.

[0047] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A combined airflow distribution plate suitable for ultra-high-efficiency electrostatic precipitators, characterized in that: The device includes a first distribution plate (1), a second distribution plate (2) and a third distribution plate (3) installed inside the air inlet box (8) of the electrostatic precipitator, arranged from left to right. The first distribution plate (1) is located near the air inlet of the air inlet box of the electrostatic precipitator. The first distribution plate (1) has a convex bottom inclined surface structure. The convex bottom is a plane A1, and both the plane A1 and the inclined surface are provided with ventilation holes (7). The second distribution plate (2) is a convex bottom inclined structure. The convex bottom is a plane A2. Both the plane A2 and the inclined surface are provided with ventilation holes (7). A first flue gas deceleration pipe (4) is provided at the outlet position of the ventilation hole (7) on the plane A2. The third distribution plate (3) has a concave bottom inclined structure. The concave bottom is a plane A3. A ventilation hole (7) is provided on the plane A3. There is no ventilation hole (7) on the inclined surface. The plane A3 is divided into an upper flue gas deceleration zone A31, a middle flue gas acceleration zone A32, and a lower flue gas deceleration zone A33 from top to bottom. A second flue gas deceleration pipe (5) is provided at the outlet position of the ventilation hole (7) on the upper flue gas deceleration zone A31 and the lower flue gas deceleration zone A33. A flue gas acceleration pipe (6) is provided at the outlet position of the ventilation hole on the middle flue gas acceleration zone A32. The angle a1 between the plane A1 and the inclined plane of the first distribution plate (1) is ≤8°. The area of ​​the plane A1 accounts for 18~20% of the total area of ​​the first distribution plate (1) and the opening rate is ≥50%. The area of ​​the inclined plane accounts for 80~82% of the total area of ​​the first distribution plate (1) and the opening rate is ≥40%. The central axis of the vent hole (7) on the plane A1 is perpendicular to the plane A1, and the central axis of the vent hole (7) on the inclined plane is perpendicular to the inclined plane. The angle a2 between the plane A2 and the inclined plane on the second distribution plate (2) is ≤8°. The area of ​​the plane A2 accounts for 32~35% of the total area of ​​the second distribution plate (2) and the opening rate is ≥50%. The area of ​​the inclined plane accounts for 65~68% of the total area of ​​the second distribution plate (2) and the opening rate is ≥40%. The central axis of the vent hole (7) on the plane A2 is perpendicular to the plane A2. The central axis of the vent hole (7) on the inclined plane is perpendicular to the inclined plane. The angle a3 between the plane A3 and the inclined plane of the third distribution plate (3) is ≥30°. The central axis of the vent (7) on the plane A3 is perpendicular to the plane A3. The area of ​​the plane A3 accounts for 94~96% of the total area of ​​the third distribution plate (3). The area of ​​the upper flue gas deceleration zone A31 accounts for 18~20% of the total area of ​​the plane A3, and the opening rate is ≥30%. The area of ​​the middle flue gas acceleration zone A32 accounts for 60~64% of the total area of ​​the plane A3, and the opening rate is ≥40%. The area of ​​the lower flue gas deceleration zone A33 accounts for 18~20% of the total area of ​​the plane A3, and the opening rate is ≥30%.

2. The combined airflow distribution plate suitable for ultra-high-efficiency electrostatic precipitators according to claim 1, characterized in that: The central axis of the first flue gas deceleration pipe (4) is consistent with the central axis of the corresponding vent (7). The inlet diameter of the first flue gas deceleration pipe (4) is the same as the diameter of the vent (7), the outlet diameter is 1.10 to 1.15 times the inlet diameter, and the length is ≤60mm. The central axis of the second flue gas deceleration pipe (5) is consistent with the central axis of the corresponding vent (7). The inlet diameter of the second flue gas deceleration pipe (5) is the same as the diameter of the vent (7), the outlet diameter is 1.05 to 1.10 times the inlet diameter, and the length is ≤60mm. The central axis of the flue gas speed-increasing pipe (6) is consistent with the central axis of the corresponding vent (7). The inlet diameter of the flue gas speed-increasing pipe (6) is the same as the diameter of the vent (7), the outlet diameter is 0.90 to 0.95 times the inlet diameter, and the length is ≤60mm.

3. A combined airflow distribution plate suitable for ultra-high-efficiency electrostatic precipitators according to claim 1, characterized in that: The installation distance between the first distribution plate (1) and the second distribution plate (2) is L1, and the installation distance between the second distribution plate (2) and the third distribution plate (3) is L2, where L2 > (2~2.5)L1.

4. A combined airflow distribution plate suitable for ultra-high-efficiency electrostatic precipitators according to claim 1, characterized in that: The first distribution plate (1), the second distribution plate (2), and the third distribution plate (3) are made of plate material with a thickness of 4~6mm and the material is carbon steel or low alloy steel. The first flue gas deceleration pipe (4), the second flue gas deceleration pipe (5) and the flue gas speed-up pipe (6) are made of carbon steel or low alloy steel, and the wall thickness of the pipe is 3.5~4mm.

Images