Electrostatic precipitator and its insulation system

Abstract

The invention discloses an electrostatic precipitator and an insulation system thereof, wherein the insulation system of the electrostatic precipitator comprises a cathode hanging insulation device and a cathode rapping shaft through-wall insulation device; the cathode hanging insulation device sets an isolation layer so that an insulation box and a supporting insulator located in the insulation box are away from the top plate of the electrostatic precipitator shell, thereby realizing a high-position arrangement of the supporting insulator; at the same time, a heat insulation layer is set in the isolation layer so that the flue gas is directed to the heat conduction area of ​​the insulator, and hot air blowing is set at the insulator cover plate, thereby reducing the contact heat conduction and radiation heat conduction of the high-temperature flue gas inside the electrostatic precipitator shell to the supporting insulator, avoiding the hot flue gas from entering the insulation area through convection, reducing the influence of high temperature on the supporting insulator, and avoiding the problem of the supporting insulator's insulation performance and bearing performance being reduced due to high temperature; the cathode rapping shaft through-wall insulation device sets a through-wall insulation sleeve between the shell wall panel and the rapping shaft, and is equipped with hot air blowing, thereby improving the insulation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic precipitators, and more particularly to an electrostatic precipitator and an insulation system thereof. Background Art

[0002] In recent years, with the deepening implementation of ultra-low industrial flue gas emissions initiatives, efforts to control exhaust gases from industrial furnaces in non-electrical industries such as glass, cement, and non-ferrous metallurgy have been steadily increasing. Exhaust gases from these furnaces are characterized by high temperatures, high dust viscosity, and moisture absorption. To ensure the proper functioning of downstream flue gas treatment equipment, high-temperature electrostatic precipitators (ESPs) are typically installed for dust removal. Insulation is one of the key factors in ensuring the stable operation of ESPs.

[0003] The insulation of the electrostatic precipitator mainly depends on the insulation of the cathode hanging part and the insulation of the cathode rapping shaft through the wall. Among them, the cathode hanging part is provided with a supporting insulator, and the cathode rapping shaft through the wall has a cavity or an insulating sealing plate filler sealing structure.

[0004] The aforementioned support insulators and sealing structures are collectively referred to as insulating components, which are generally made of ceramic, quartz, or polymer materials. The insulating properties of insulating components decrease as the temperature rises, and their load-bearing capacity also drops significantly. It is more likely that the insulating properties of the insulating components will fail to meet the requirements, or that the insulating components will be damaged under load, causing the electrostatic precipitator to malfunction. Furthermore, due to the high temperature conditions of industrial furnaces, the dust particles are fine in size, have a high surface specific kinetic energy, and are highly viscous. They easily adhere to the surface of the insulating components, leading to dust accumulation and even condensation and creepage, which can render the electrostatic precipitator inoperable and even damage the insulating components.

[0005] The cathode rapping drive device of the electrostatic precipitator is connected to the cathode rapping shaft through an insulating shaft. The cathode rapping shaft needs to pass through the shell wall panel and enter the electric field to drive the rapping hammer to strike the cathode to achieve the purpose of cleaning. When the above-mentioned cathode rapping shaft penetrates the shell wall panel, when an insulating sealing plate filler sealing structure is adopted, dust is easily adhered to the surface of the sealing plate, resulting in creepage flashover, making the insulation poor. When the sealing plate filler is not used for sealing, in order to ensure sufficient discharge spacing, a sufficiently large hole needs to be opened. Even if hot air blowing is set, dust is very easy to float into the rapping box and contaminate the insulating shaft, resulting in poor insulation. Summary of the Invention

[0006] The object of the present invention is to provide an insulation system for an electrostatic precipitator to improve the insulation performance of the electrostatic precipitator. Another object of the present invention is to provide an electrostatic precipitator having the above insulation system.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] An insulation system for an electrostatic precipitator, comprising a cathode hanging insulation device and / or a cathode rapping shaft through-wall insulation device;

[0009] The cathode hanging insulation device includes: an insulation box, a support insulator located in the insulation box, and an isolation layer located outside the top plate of the electrostatic precipitator housing; wherein the isolation layer is provided on the top plate of the electrostatic precipitator housing, the isolation layer connects the insulation box and the top plate, and the isolation layer supports the support insulator;

[0010] The cathode rapping shaft through-wall insulation device includes: a cathode rapping shaft and a through-wall insulation tube; wherein, the through-wall insulation tube passes through the wall panel of the electrostatic precipitator shell, the cathode rapping shaft passes through the through-wall insulation tube, and the through-wall insulation tube is located between the wall panel and the cathode rapping shaft.

[0011] Preferably, when the insulation system of the electrostatic precipitator includes the cathode hanging insulation device, the insulation box is provided with a first hot air outlet, and the upper cover plate of the support insulator is provided with a through hole for supplying hot air to enter the interior of the support insulator.

[0012] Preferably, the cathode hanging insulation device further comprises a dustproof sleeve for extending into the electrostatic precipitator housing, the dustproof sleeve is arranged at the bottom end of the support insulator and the dustproof sleeve is in communication with the support insulator.

[0013] Preferably, when the insulation system of the electrostatic precipitator includes the cathode suspension insulation device, the cathode suspension insulation device further includes: a heat insulation layer located in the isolation layer and connected to the top plate.

[0014] Preferably, when the insulation system of the electrostatic precipitator includes the cathode rapping shaft through-wall insulation device, the through-wall insulation tube is a high-aluminum ceramic tube or a quartz tube, and the through-wall insulation tube is a round tube.

[0015] When the insulation system of the electrostatic precipitator includes the cathode rapping shaft through-wall insulation device,

[0016] Preferably, when the insulation system of the electrostatic precipitator includes the cathode rapping shaft through-wall insulation device, the cathode rapping shaft through-wall insulation device further includes a rapping box, the rapping box is mounted on the wall panel and forms a closed space with the wall panel, and the rapping box is provided with a second hot air outlet;

[0017] One end of the through-wall insulating tube is located in the rapping box, and a gap is provided between the cathode rapping shaft and the through-wall insulating tube.

[0018] Based on the above-mentioned insulation system of the electrostatic precipitator, the present invention further provides an electrostatic precipitator, which includes an insulation system, and the insulation system is the insulation system of the electrostatic precipitator described in any one of the above-mentioned items.

[0019] When the insulation system of the electrostatic precipitator provided by the present invention includes a cathode hanging insulation device, an isolation layer is set up to keep the insulation box and the supporting insulators located in the insulation box away from the top plate of the electrostatic precipitator shell. At the same time, a heat insulation layer is set up in the isolation layer for the flue gas to flow toward the heat conduction area of ​​the insulator, and a hot air purge is set up at the insulator cover plate, thereby reducing the contact heat conduction and radiation heat conduction of the high-temperature flue gas inside the electrostatic precipitator shell to the supporting insulator, avoiding the hot flue gas from entering the insulation area through convection, reducing the influence of high temperature on the supporting insulator, avoiding the problem of the supporting insulator's insulation performance and load-bearing performance being reduced due to high temperature, and effectively improving the insulation performance of the electrostatic precipitator.

[0020] When the insulation system of the electrostatic precipitator provided by the present invention includes a cathode rapping shaft through-wall insulation device, a through-wall insulation sleeve is set between the shell wall panel and the rapping shaft, and hot air is configured to blow to avoid dust sticking to the surface of the sealing plate when a sealing plate filler sealing structure is adopted, and the problem of flue gas dust entering the rapping box and contaminating the insulating shaft when a sealing plate filler sealing structure is not adopted, thereby avoiding creeping flashover on the surface of the insulation part, thereby effectively improving the insulation performance of the electrostatic precipitator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of a cathode hanging device in an insulation system of an electrostatic precipitator provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a cathode rapping shaft through-wall insulation device in an insulation system of an electrostatic precipitator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that the "first" and "second" in this article are used to distinguish components or structures, and there is no distinction between the order of precedence.

[0026] The insulation system of the electrostatic precipitator provided in the embodiment of the present invention includes a cathode hanging insulation device and / or a cathode rapping shaft wall-penetrating insulation device.

[0027] Figure 1 In the figure, the hollow horizontal arrows indicate the hot air flow direction, and the black solid horizontal arrows indicate the flue gas flow direction in the electrostatic precipitator shell. Figure 1 As shown, the cathode hanging insulation device includes: an insulation box 1, a support insulator 2 located in the insulation box 1, and an isolation layer 4 located on the outside of the top plate of the electrostatic precipitator shell; wherein, the isolation layer 4 is arranged on the top plate 6 of the electrostatic precipitator shell, the isolation layer 4 connects the insulation box 1 and the top plate 6, and the isolation layer 4 supports the support insulator 2.

[0028] The cathode hanging insulation device is provided with an isolation layer 4 so that the insulation box 1 and the support insulator 2 located in the insulation box 1 are away from the top plate 6 of the electrostatic precipitator shell, thereby realizing a high-position arrangement of the support insulator 2, that is, the support insulator 2 is away from the high-temperature flue gas inside the electrostatic precipitator shell, which greatly reduces the contact heat conduction and radiation heat conduction of the high-temperature flue gas inside the electrostatic precipitator shell to the support insulator 2, avoids the hot flue gas from entering the insulating area through convection, reduces the influence of high temperature on the support insulator 2, and can avoid the problem of the support insulator 2 being damaged due to the degradation of insulation performance due to high temperature, and the problem of damage under load after the strength is reduced due to high temperature, thereby effectively improving the insulation performance of the electrostatic precipitator.

[0029] The specific structure of the isolation layer 4 is designed according to actual needs and can utilize the shell load-bearing box beam or top beam, or adopt a separate support arrangement, as long as the support insulator 2 is set at a high position. This embodiment does not limit the specific structure of the isolation layer 4.

[0030] When the insulation system of the electrostatic precipitator includes a cathode hanging insulation device, the insulation box 1 is provided with a first hot air outlet, and the upper cover of the support insulator 2 is provided with a through hole for hot air to enter the interior of the support insulator 2. Preferably, the first hot air outlet is higher than the top of the support insulator 2.

[0031] In the above structure, hot air enters the insulation box 1 from the first hot air port and enters the supporting insulator 2 through the through hole of the upper cover plate of the supporting insulator 2, thereby realizing hot air blowing, that is, the hot air presses the high-temperature flue gas and the dust in the high-temperature flue gas to the outside of the supporting insulator 2, making it difficult for the dust in the high-temperature flue gas to contact the supporting insulator 2, so that the wall surface of the supporting insulator 2 remains clean. At the same time, it also prevents the heat of the high-temperature flue gas from being transferred to the supporting insulator 2 through convection, and greatly reduces the heat transferred to the supporting insulator 2 by the high-temperature flue gas through thermal radiation, thereby creating an insulator chamber that is away from the high-temperature flue gas, is cleaner, and has a more suitable temperature, further avoiding the problem of the supporting insulator 2 being damaged under load due to the degradation of insulation performance due to high temperature, and the problem of the supporting insulator 2 being damaged under load due to the degradation of strength due to high temperature.

[0032] Furthermore, the cathode hanging insulation device further includes a dustproof sleeve 3 for extending into the electrostatic precipitator housing. The dustproof sleeve 3 is arranged at the bottom end of the support insulator 2 and the dustproof sleeve 3 is connected to the support insulator 2.

[0033] In the above structure, hot air enters the insulation box 1 from the first hot air port, and enters the supporting insulator 2 through the through hole of the upper cover plate of the supporting insulator 2, realizing hot air blowing, that is, the hot air presses the high-temperature flue gas and the dust in the high-temperature flue gas to the outside of the dust sleeve 3, further avoiding the dust in the high-temperature flue gas from being difficult to contact the supporting insulator 2, so that the wall surface of the supporting insulator 2 remains clean. At the same time, it also avoids the heat of the high-temperature flue gas from being transferred to the supporting insulator 2 through convection, and greatly reduces the heat of the high-temperature flue gas from being transferred to the supporting insulator 2 through thermal radiation, thereby creating an insulator chamber that is away from the high-temperature flue gas, is cleaner, and has a more suitable temperature, further avoiding the problem of the supporting insulator 2 being damaged under load due to the reduction of insulation performance due to high temperature, and the problem of the supporting insulator 2 being damaged under load due to the reduction of strength due to high temperature.

[0034] The cross section of the dustproof sleeve 3 is preferably circular, but may also be square or other shapes.

[0035] The temperature of the top plate 6 of the electrostatic precipitator housing is relatively high. To reduce the impact of the top plate 6 on the support insulator 2, the insulation system of the electrostatic precipitator further includes a heat-insulating layer 5 located within the isolation layer 4 and connected to the top plate 6. It is understood that the heat-insulating layer 5 is located between the top plate 6 and the insulation box 1.

[0036] The above-mentioned heat insulation layer 5 is preferably made of high-temperature resistant heat insulation material, such as aluminum silicate fiber cotton. Other high-temperature resistant heat insulation materials can also be used, and this embodiment does not limit this.

[0037] The thermal insulation layer 5 is located in the area where the flue gas conducts heat to the support insulator 2 . The thermal insulation layer 5 reduces the heat exchange between the high-temperature flue gas and the isolation layer 4 , thereby reducing the impact of the high-temperature flue gas on the support insulator 2 .

[0038] Figure 2 In the figure, the hollow vertical arrows indicate the direction of hot air flow. Figure 2 As shown, the above-mentioned cathode rapping shaft through-wall insulation device includes: a cathode rapping shaft 12 and a through-wall insulation tube 13; wherein, the through-wall insulation tube 13 passes through the wall panel 14 of the electrostatic precipitator shell, the cathode rapping shaft 12 passes through the through-wall insulation tube 13, and the through-wall insulation tube 13 is located between the wall panel 14 and the cathode rapping shaft 12.

[0039] In the above structure, the cathode rapping shaft 12 is completely isolated from the wall panel 14 by providing the through-wall insulating tube 13. Since the through-wall insulating tube 13 does not need to bear weight, even if the bearing capacity decreases in a high temperature environment, it will not be broken due to insufficient strength, thereby ensuring the stability and reliability of the entire electrostatic precipitator insulation.

[0040] The material of the above-mentioned through-wall insulating tube 13 is preferably high-aluminum ceramic or quartz, that is, the above-mentioned through-wall insulating tube 13 is a high-aluminum ceramic tube or a quartz tube. Of course, the material of the above-mentioned through-wall insulating tube 13 can also be other temperature-resistant insulating materials, which is not limited in this embodiment.

[0041] The cross section of the through-wall insulating tube 13 is circular, square, pentagonal or other shapes. Preferably, the cross section of the through-wall insulating tube 13 is circular, that is, the through-wall insulating tube 13 is a round tube.

[0042] The above-mentioned cathode rapping shaft through-wall insulation device also includes a rapping box 10, which is installed on the wall panel 14 and forms a closed space with the wall panel 14. The rapping box 10 is provided with a second hot air outlet, and one end of the through-wall insulation tube 13 is located in the rapping box 10, and there is a gap between the cathode rapping shaft 12 and the through-wall insulation tube 13.

[0043] In the above structure, hot air enters the rapping box 10 from the second hot air port, and then enters the gap between the through-wall insulating tube 13 and the cathode rapping shaft 12, realizing hot air blowing, avoiding the dust in the electrostatic precipitator shell from being deposited between the through-wall insulating tube 13 and the cathode rapping shaft 12, and avoiding the dust from entering the rapping box 10, thereby avoiding contamination of the cathode rapping shaft 12 and the insulating shaft 9, keeping the inner wall of the through-wall insulating tube 13 and the surface of the insulating shaft 9 clean, and preventing the problem of insulation performance degradation or even loss of insulation performance due to surface dust adhesion and creepage.

[0044] The rapping box 10 is mounted on the wall panel 14 and forms a closed space, which encloses the wall-penetrating insulating tube 13, the insulating shaft 9, and the cathode rapping shaft 12 outside the electrostatic precipitator housing.

[0045] The rapping box 10 is provided with an insulation layer 8 to achieve heat preservation. The drive device 7 outside the rapping box 10 drives the cathode rapping shaft 12 to rap. The rapping box 10 is provided with an electric heater 11 for heating. The electric heater 11 heats the hot air entering the rapping box 10 from the second hot air inlet.

[0046] Based on the insulation system of the electrostatic precipitator provided in the above embodiment, an embodiment of the present invention further provides an electrostatic precipitator, which includes an insulation system, and the insulation system is the insulation system of the electrostatic precipitator described in the above embodiment.

[0047] Since the insulation system of the above-mentioned electrostatic precipitator has the above-mentioned technical effects, and the above-mentioned electrostatic precipitator has the above-mentioned insulation system of the electrostatic precipitator, the above-mentioned electrostatic precipitator also has the corresponding technical effects, which will not be repeated in this article.

[0048] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. An insulation system for an electrostatic precipitator, characterized in that: Including cathode hanging insulation device and cathode rapping shaft wall insulation device; The cathode hanging insulation device comprises: an insulation box (1), a support insulator (2) located in the insulation box (1), and an isolation layer (4) located outside the top plate of the electrostatic precipitator housing; wherein the isolation layer (4) is arranged on the top plate (6) of the electrostatic precipitator housing, the isolation layer (4) connects the insulation box (1) and the top plate (6), and the isolation layer (4) supports the support insulator (2), and the flue gas in the electrostatic precipitator housing and the isolation layer (4) are located on opposite sides of the top plate (6); The cathode rapping shaft through-wall insulation device comprises: a cathode rapping shaft (12) and a through-wall insulation tube (13); wherein the through-wall insulation tube (13) penetrates a wallboard (14) of an electrostatic precipitator housing, the cathode rapping shaft (12) penetrates the through-wall insulation tube (13), and the through-wall insulation tube (13) is located between the wallboard (14) and the cathode rapping shaft (12); The cathode hanging insulation device further comprises: a heat insulation layer (5) located within the isolation layer (4) and connected to the top plate (6).

2. The insulation system of the electrostatic precipitator according to claim 1, characterized in that: The heat preservation box (1) is provided with a first hot air outlet, and the upper cover plate of the support insulator (2) is provided with a through hole for hot air to enter the interior of the support insulator (2).

3. The insulation system of the electrostatic precipitator according to claim 2, characterized in that: The cathode hanging insulation device further comprises a dustproof sleeve (3) for extending into the electrostatic precipitator housing, wherein the dustproof sleeve (3) is arranged at the bottom end of the support insulator (2) and the dustproof sleeve (3) and the support insulator (2) are in communication.

4. The insulation system of the electrostatic precipitator according to claim 1, characterized in that: The through-wall insulating tube (13) is a high-aluminum ceramic tube or a quartz tube, and the through-wall insulating tube (13) is a round tube.

5. The insulation system of the electrostatic precipitator according to claim 1, characterized in that: The cathode rapping shaft through-wall insulation device further comprises a rapping box (10), wherein the rapping box (10) is mounted on the wallboard (14) and forms a closed space with the wallboard (14), and the rapping box (10) is provided with a second hot air outlet; One end of the through-wall insulating tube (13) is located in the rapping box (10), and a gap is provided between the cathode rapping shaft (12) and the through-wall insulating tube (13).

6. An electrostatic precipitator comprising an insulation system, characterized in that: The insulation system is the insulation system of the electrostatic precipitator according to any one of claims 1 to 5.

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