Electrostatic precipitator and cathode rapping insulation device thereof

Abstract

The invention discloses an electrostatic precipitator and a cathode rapping insulation device thereof, the cathode rapping insulation device comprising a rapping shaft and a rapping box, the rapping shaft passes through the wallboard of the electrostatic precipitator housing and extends into the interior of the electrostatic precipitator; further comprising an insulating tube, a collar and a hot air source; the insulating tube is sleeved on the rapping shaft, and there is no contact between the two, one end of the insulating tube is located in the rapping box, and the other end is located in the electrostatic precipitator; the collar is sleeved on the insulating tube, and there is no contact between the two, one end of the collar is sealed and fixedly connected to the wallboard, and the other end extends into the electrostatic precipitator; the rapping box is provided with an air inlet, the hot air source is connected to the air inlet, so that hot air enters the rapping box, and forms an air curtain between the insulating tube and the rapping shaft and between the collar and the insulating tube. The device can ensure the insulation effect of the cathode rapping shaft.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic precipitators, in particular to an electrostatic precipitator and a cathode rapping insulation device thereof. Background Art

[0002] Boiler exhaust gas from industries such as waste incineration, metal smelting, and alkali recovery has the characteristics of high flue gas temperature, fine dust particle size, strong viscosity, and easy moisture absorption. In order to ensure the normal operation of downstream flue gas treatment equipment, point dust collectors are generally installed for dust removal. Insulation is one of the factors to ensure the stable and reliable operation of electrostatic precipitators.

[0003] The insulation device of the electrostatic precipitator mainly includes the cathode suspension insulation device and the cathode rapping insulation device.

[0004] The cathode rapping system of the electrostatic precipitator includes a rapping insulation box, a rapping shaft and a driving component. The driving component is connected to the rapping shaft in a driving manner. The rapping shaft passes through the rapping insulation box and the wall panel and extends into the interior of the electrostatic precipitator to be connected to the rapping hammer. The driving component drives the rapping hammer to rotate and hammer through the rapping shaft to achieve the purpose of removing dust accumulated in the cathode system.

[0005] The cathode rapping shaft carries high voltage and needs to be insulated. The cathode rapping shaft insulation device includes an insulation structure between the rapping shaft and the driving component and an insulation structure between the rapping shaft and the wallboard.

[0006] Specifically, the rapping shaft is connected to the driving component through an insulating shaft, and the insulating shaft is located in a rapping insulation box. The insulation of the rapping insulation box can prevent condensation on the surface of the insulating shaft from causing insulation failure.

[0007] Specifically, there are two conventional ways to set the insulation structure between the rapping shaft and the wallboard:

[0008] First, an insulating sealing plate is set at the position where the rapping shaft passes through the wallboard. This method is not suitable for high-temperature and high-viscosity dust conditions. Under high temperature, the insulation performance of the insulating sealing plate decreases and it is easy to be broken down and lose its insulation performance. At the same time, the surface of the insulating sealing plate is easy to stick to dust, resulting in creepage and insulation failure.

[0009] Second, a large hole is opened at the position where the rapping shaft passes through the wall panel, and a hot air blowing structure is used. The rapping shaft passes through the large hole without contacting the wall panel. Hot air blowing is used to suppress dust from entering and accumulating in the rapping insulation box. This method requires a large air volume and a matching electric heater with high energy consumption to suppress dust from entering the rapping insulation box, resulting in high energy consumption. In addition, it is found in actual applications that even if a large air volume is used for blowing, dust will still pass through the large hole into the rapping insulation box and accumulate in the rapping insulation box, causing a large amount of dust to adhere to the surface of the insulating shaft in the rapping insulation box, resulting in creepage of the insulating shaft and loss of insulation performance.

[0010] In view of this, how to improve the cathode rapping insulation device of the electrostatic precipitator to improve the insulation effect of the cathode rapping shaft is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0011] The object of the present invention is to provide an electrostatic precipitator and a cathode rapping insulation device thereof, which can effectively prevent dust in the electric field of the electrostatic precipitator from accumulating or adhering to the insulation structure of the rapping shaft, thereby avoiding the problem of insulation failure and further improving the insulation effect of the cathode rapping system.

[0012] In order to solve the above technical problems, the present invention provides a cathode rapping insulation device for an electrostatic precipitator, comprising a rapping shaft and a rapping box, wherein the rapping shaft passes through a wall plate of an electrostatic precipitator housing and extends into the interior of the electrostatic precipitator; further comprising an insulating tube, a sleeve ring and a hot air source;

[0013] The insulating tube is sheathed on the rapping shaft without contact therebetween, one end of the insulating tube is located in the rapping box, and the other end is located inside the electrostatic precipitator;

[0014] The sleeve ring is placed outside the insulating tube without contact between the two, one end of the sleeve ring is sealed and fixed to the wallboard, and the other end extends into the interior of the electrostatic precipitator;

[0015] The rapping box is provided with an air inlet, and the hot air source is connected to the air inlet, so that hot air enters the rapping box and forms an air curtain between the insulating tube and the rapping shaft and between the sleeve ring and the insulating tube.

[0016] The cathode rapping insulation device for the electrostatic precipitator provided by the invention, through the above-mentioned arrangement of the rapping shaft, the insulating tube and the collar, uses hot air to form wind curtains between the rapping shaft and the insulating tube, and between the insulating tube and the collar, which is equivalent to a double-ring wind curtain. On the one hand, it can prevent dust in the electric field of the electrostatic precipitator from entering between the insulating tube and the rapping shaft, so that the cathode rapping shaft with high voltage maintains a good insulation state; on the other hand, it can prevent dust in the electric field from adhering or accumulating on the outer wall of the insulating tube, avoiding the problem of reduced safe insulation distance of the insulating tube or even causing creepage; in addition, the air film formed by the hot air between the inner wall and the outer wall of the insulating tube can isolate the high temperature of the flue gas in the electric field from affecting the insulation performance of the insulating tube, so that the insulating tube maintains better insulation performance; therefore, the device can ensure the insulation effect between the rapping shaft and the wall panel of the electrostatic precipitator shell, avoid the problem of insulation failure, and improve the insulation performance of the cathode rapping system.

[0017] In the cathode rapping insulation device of the electrostatic precipitator as described above, a dust cover is also provided above the collar.

[0018] In the cathode rapping insulation device of the electrostatic precipitator as described above, the rapping shaft and the insulating tube are coaxially arranged to form a circulation channel for hot air to flow therebetween, and / or the sleeve and the insulating tube are coaxially arranged to form a circulation channel for hot air to flow therebetween.

[0019] In the cathode rapping insulation device of the electrostatic precipitator as described above, the sleeve ring includes a first ring portion and a second ring portion connected to each other, and the first ring portion is arranged close to the wall panel; along the hot air flow direction, the flow area of ​​the first ring portion gradually decreases, and the flow area of ​​the second ring portion is the same.

[0020] The cathode rapping insulation device of the electrostatic precipitator as described above, the hot air source comprises a heating component and a fan, the air outlet of the fan is connected to the air inlet, and the heating component is used to heat the air blown by the fan to form hot air;

[0021] Alternatively, the hot air source is the purified hot flue gas from the electrostatic precipitator.

[0022] In the cathode rapping insulation device of the electrostatic precipitator as described above, the insulating tube is a ceramic insulating tube or a quartz insulating tube.

[0023] In the cathode rapping insulation device of the electrostatic precipitator as described above, an electric heater for heating is arranged in the rapping box.

[0024] In the cathode rapping insulation device of the electrostatic precipitator as described above, the rapping shaft is connected to a driving component via an insulating shaft, and the insulating shaft is located inside the rapping box.

[0025] The present invention also provides an electrostatic precipitator, comprising an insulating component system, wherein the insulating component system comprises the cathode rapping insulating device described in any one of the above items.

[0026] Since the cathode rapping insulation device has the above-mentioned technical effects, the electrostatic precipitator including the cathode rapping insulation device also has the same technical effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional schematic diagram of a specific embodiment of the cathode rapping insulation device for an electrostatic precipitator provided by the present invention;

[0028] Figure 2 for Figure 1 A partial enlarged view of the fitting area between the rapping shaft and the wall panel is shown in FIG.

[0029] Description of reference numerals:

[0030] Wall panel 100;

[0031] The rapping box 210 , the air inlet 211 , the rapping shaft 220 , the insulating tube 230 , the collar 240 , the first ring portion 241 , the second ring portion 242 , the folded edge portion 243 , the dust cover 250 , the insulating shaft 260 , and the electric heater 270 . DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] For ease of understanding and concise description, the following text will explain the electrostatic precipitator and its cathode rapping insulation device together, and the beneficial effects will not be repeated.

[0034] The electrostatic precipitator is usually equipped with a cathode rapping device, which achieves the purpose of cleaning by driving a rapping hammer to strike the cathode. The cathode rapping device usually adopts a side transmission method, that is, the rapping shaft passes through the wall panel of the electrostatic precipitator shell and extends into the electrostatic precipitator, and is connected to the rapping hammer. The driving components that drive the rapping shaft and the connection structure with the rapping shaft are located outside the electrostatic precipitator shell.

[0035] Since the rapping shaft carries high voltage, its insulation performance needs to be ensured during installation. The insulation system of the electrostatic precipitator includes a cathode rapping insulation device. This article focuses on improving the cathode rapping insulation device of the electrostatic precipitator. Other structures of the electrostatic precipitator can refer to the existing technology.

[0036] Please refer to Figure 1 , Figure 1 The present invention is a cross-sectional schematic diagram of a specific embodiment of the cathode rapping insulation device of the electrostatic precipitator provided by the present invention.

[0037] In this embodiment, the cathode rapping insulation device of the electrostatic precipitator includes a rapping box 210 and a rapping shaft 220. The rapping box 210 is arranged on the outside of the electrostatic precipitator shell and forms a relatively sealed space together with the wall panel 100 of the shell. One end of the rapping shaft 220 is connected to the driving component (not shown in the figure) through the insulating shaft 260, and the other end passes through the wall panel 100 and extends into the interior of the electrostatic precipitator to be connected with the rapping hammer (not shown in the figure).

[0038] The cathode rapping insulation device further includes an insulating tube 230, a sleeve ring 240 and a hot air source.

[0039] The insulating tube 230 is externally mounted on the rapping shaft 220, and there is no contact between the two, that is, a flow space is formed between the inner wall of the insulating tube 230 and the outer peripheral wall of the rapping shaft 220, one end of the insulating tube 230 is located in the rapping box 210, and the other end is located inside the electrostatic precipitator, that is, the insulating tube 230 passes through the wall panel 100, so that the insulating tube 230 separates the rapping shaft 220 and the wall panel 100, avoiding contact between the rapping shaft 220 and the wall panel 100, and realizing insulation between the rapping shaft 220 and the wall panel 100.

[0040] The collar 240 is sleeved on the insulating tube 230 without contact therebetween, that is, a flow space is formed between the inner wall of the collar 240 and the outer wall of the insulating tube 230, one end of the collar 240 is sealed and fixed to the wall panel 100, and the other end extends into the interior of the electrostatic precipitator, that is, the collar 240 is only sleeved on the portion of the insulating tube 230 located inside the electrostatic precipitator.

[0041] The rapping box 210 is provided with an air inlet 211 , and the hot air is connected to the air inlet 211 so that the hot air enters the rapping box 210 through the air inlet 211 and forms a wind curtain between the insulating tube 230 and the rapping shaft 220 and between the collar 240 and the insulating tube 230 .

[0042] like Figure 1 As shown, the solid arrow indicates the flow direction of the hot air. After the hot air flows into the rapping box 210 through the air inlet 211, it flows into the inside of the electrostatic precipitator through the hole between the insulating tube 230 and the rapping shaft 220 and the space between the collar 240 and the insulating tube 230. In this way, a wind curtain is formed between the rapping shaft 220 and the insulating tube 230, and a wind curtain is also formed between the insulating tube 230 and the collar 240, which is equivalent to a double-ring wind curtain. The formation of the wind curtain can prevent dust in the electric field of the electrostatic precipitator from entering. Between the insulating tube 230 and the rapping shaft 220, the cathode rapping shaft 220 with high voltage can maintain a good insulation state. On the other hand, it can prevent the dust in the electric field from adhering or accumulating on the outer wall of the insulating tube 230, which may reduce the safe insulation distance of the insulating tube 230 or cause creepage problems. In addition, the air film formed by the hot air between the inner wall and the outer wall of the insulating tube 230 can isolate the high temperature in the electric field from affecting the insulation performance of the insulating tube 230, so that the insulating tube maintains better insulation performance.

[0043] It should be noted here that, for a high-temperature electrostatic precipitator, the temperature of the hot air from the hot air source is lower than the temperature of the flue gas in the electric field of the electrostatic precipitator.

[0044] It can be seen that the insulating structure setting of the device can ensure the insulation effect between the rapping shaft 220 and the wall panel 100 of the electrostatic precipitator housing, avoid the problem of insulation failure, and improve the insulation performance of the cathode rapping system.

[0045] Compared with the insulation method of opening large holes and cooperating with hot air blowing structure in the background technology, this solution does not need to open large holes on the wall panel 100. Through the coordinated design of the ring 240 and the insulating tube 230, the use of high-energy hot air equipment is avoided. At the same time, the formation of a double-ring air curtain can prevent dust from entering the vibration box 210, avoiding the influence of dust accumulation in the vibration box 210 on the insulation performance of the insulating shaft 260.

[0046] Please refer to Figure 2 , Figure 2 for Figure 1 A partial enlarged view of the fitting area between the rapping shaft and the wall panel is shown in FIG.

[0047] In a specific solution, the collar 240 includes a first ring portion 241 and a second ring portion 242. The first ring portion 241 is a variable cross-section structure, and its cross-sectional area gradually decreases from the outside to the inside of the electrostatic precipitator housing. The second ring portion 242 is a constant cross-sectional structure, that is, along the flow direction of the hot air, the flow area of ​​the first ring portion 241 gradually decreases, and the flow area of ​​the second ring portion 242 is the same. This arrangement can reduce the resistance of the hot air flow to form a stable wind curtain. The corner transition of the collar 240 can be in the form of a folded edge, or in the form of an arc or other forms.

[0048] The outer end of the first ring portion 241 is folded outward to form a folded edge portion 243 , and the sleeve ring 240 is connected and fixed to the wall panel 100 via the folded edge portion 243 .

[0049] The above structural arrangement of the collar 240 can increase the flow velocity of the hot air when it flows from between the first ring portion 241 and the insulating tube 230 to between the second ring portion 242 and the insulating tube 230, thereby ensuring the formation of an air curtain effect.

[0050] Of course, in actual configuration, the collar 240 may also be configured as a uniform cross-section structure as a whole.

[0051] The connection position between the collar 240 and the wall panel 100 is sealed. Specifically, the folded edge 243 of the collar 240 is sealed and fitted with the wall panel 100 to prevent dust in the electric field from entering the interior of the rapping box 210 through the gap therebetween.

[0052] In a specific solution, a dust cover 250 is provided above the collar 240 . The dust cover 250 is obviously located inside the electrostatic precipitator to prevent dust from sticking or accumulating above the collar 240 .

[0053] The dust cover 20 as a whole can be in the shape of a ridge with a slope, and of course can also be in other shapes and structures.

[0054] In a specific solution, the rapping shaft 220 and the insulating tube 230 are coaxially arranged to form a circulation channel for heating air to flow therebetween. Thus, the structure of the circulation channel is symmetrical, which can ensure the uniformity of the airflow forming the wind curtain between the rapping shaft 220 and the insulating tube 230.

[0055] The collar 240 and the insulating tube 230 are also coaxially arranged, and a flow channel for heating air to flow through is formed between the two. The structure of the flow channel is also relatively symmetrical, which can ensure the uniformity of the airflow forming the air curtain between the collar 240 and the insulating tube 230.

[0056] Specifically, the cross-sectional shape of the collar 240 is the same as the cross-sectional shape of the insulating tube 230 , for example, both are circular, square, or polygonal.

[0057] The insulating tube 230 can be made of ceramic, quartz or other insulating materials.

[0058] In a specific solution, the hot air source includes a heating component and a fan, the air outlet of the fan is connected to the air inlet 211 of the rapping box 210, and the heating component is used to heat the air blown out by the fan to form hot air.

[0059] In addition, the hot air source can also be the purified hot flue gas from the electrostatic precipitator, thereby improving its utilization rate.

[0060] In addition, as needed, an electric heater 270 for heating can be provided in the rapping box 210 . The electric heater 270 can maintain the required temperature in the rapping box 210 on the one hand, and can also ensure the temperature of the hot air blown into the rapping box 210 on the other hand.

[0061] The above is a detailed introduction to an electrostatic precipitator and a cathode rapping insulation device provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cathode rapping insulation device for an electrostatic precipitator, comprising a rapping shaft and a rapping box, wherein the rapping shaft passes through a wall plate of an electrostatic precipitator housing and extends into the interior of the electrostatic precipitator; characterized in that: It also includes an insulating tube, a collar, and a hot air source; The insulating tube is externally mounted on the rapping shaft without contact therebetween, one end of the insulating tube is located in the rapping box, and the other end is located inside the electrostatic precipitator; The sleeve ring is placed outside the insulating tube without contact between the two, one end of the sleeve ring is sealed and fixed to the wallboard, and the other end extends into the interior of the electrostatic precipitator; The rapping box is provided with an air inlet, and the hot air source is connected to the air inlet so that hot air enters the rapping box and forms an air curtain between the insulating tube and the rapping shaft and between the sleeve and the insulating tube; The sleeve ring comprises a first ring portion and a second ring portion connected to each other, the first ring portion is arranged close to the wall panel; along the hot air flow direction, the flow area of ​​the first ring portion gradually decreases, and the flow area of ​​the second ring portion is the same; A dust cover is also provided above the collar; The rapping shaft and the insulating tube are coaxially arranged, and a circulation channel for heating air to flow through is formed between the two. The sleeve ring and the insulating tube are coaxially arranged, and a circulation channel for heating air to flow through is also formed between the two.

2. The cathode rapping insulation device of the electrostatic precipitator according to claim 1, characterized in that: The hot air source comprises a heating component and a fan, the air outlet of the fan is connected to the air inlet, and the heating component is used to heat the air blown by the fan to form hot air; Alternatively, the hot air source is the purified hot flue gas from the electrostatic precipitator.

3. The cathode rapping insulation device of the electrostatic precipitator according to claim 1 or 2, characterized in that: The insulating tube is a ceramic insulating tube or a quartz insulating tube.

4. The cathode rapping insulation device of the electrostatic precipitator according to claim 1 or 2, characterized in that: An electric heater for heating is arranged in the rapping box.

5. The cathode rapping insulation device of the electrostatic precipitator according to claim 1 or 2, characterized in that: The rapping shaft is connected with a driving component via an insulating shaft, and the insulating shaft is located inside the rapping box.

6. An electrostatic precipitator, comprising an insulating member system, characterized in that The insulating component system comprises the cathode rapping insulation device according to any one of claims 1-5.

Images