An electrostatic precipitator and its continuous side cathode rapping drive device

Abstract

The present invention provides an electrostatic precipitator and a continuous side cathode rapping drive device thereof. The continuous side cathode rapping drive device includes a driving device, a transmission device, rapping hammers and a rapping shaft assembly. The rapping shaft assembly includes a plurality of rapping shaft groups arranged in sequence along its length direction. The rapping shaft groups are respectively arranged in each independent high-voltage power supply interval of the electrostatic precipitator body. The rapping shaft groups are connected by insulating sleeves. Each rapping shaft group includes a plurality of rapping shafts arranged in sequence along its length direction. A plurality of rapping hammers for rapping and dust cleaning are evenly arranged on the rapping shafts. The driving device controls the rotation of the rapping shaft assembly through the transmission device. Under the action of the rapping shaft assembly, the rapping hammers continuously rap the cathode rows arranged in the cathode frame, solving the problem that the side cathode rapping of the middle independent electric field of a single three-chamber or multi-chamber electrostatic precipitator cannot be arranged in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of dust cleaning of electrostatic precipitators, in particular to an electrostatic precipitator and a continuous side cathode rapping drive device thereof.

Background Art

[0002] Electrostatic precipitators are one of the equipment for efficiently collecting industrial flue gas particulate matter in industries such as coal-fired power plants, iron and steel metallurgy, glass, cement, and building materials. The cathode rapping device is the main factor to ensure the normal operation of the electrostatic precipitator electric field and the dust removal efficiency. A qualified cathode rapping device shakes the dust deposited on the cathode frame of the electrostatic precipitator into the lower ash hopper without causing problems in the operation of the electrostatic precipitator.

[0003] With the rapid increase in newly built supercritical and ultra-supercritical units, it is required that the electrostatic precipitator adapts to the changes of large units, the single-unit flue gas treatment volume increases, and more stringent requirements are put forward for the universality of the electrostatic precipitator.

[0004] Currently, the cathode rapping devices of single-unit three-chamber and multi-chamber electrostatic precipitators uniformly adopt top drive technology, and the side cathode rapping device cannot be arranged in the middle independent electric field of the three-chamber and multi-chamber electrostatic precipitators.

Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the side cathode rapping of single-unit three-chamber and multi-chamber electrostatic precipitators cannot be arranged in the middle independent electric field of the three-chamber and multi-chamber electrostatic precipitators in the prior art, and to propose an electrostatic precipitator and a continuous side cathode rapping drive device thereof.

[0006] To achieve the above purpose, the present invention proposes a continuous side cathode rapping drive device for an electrostatic precipitator, including a driving device, a transmission device, rapping hammers, and a rapping shaft assembly. The rapping shaft assembly includes a plurality of rapping shaft groups arranged in sequence along its length direction. The rapping shaft groups are respectively arranged in each independent high-voltage power supply interval of the electrostatic precipitator body. Adjacent two rapping shaft groups on each rapping shaft assembly are connected by an insulating sleeve. Each rapping shaft group includes a plurality of rapping shafts arranged in sequence along its length direction. A plurality of rapping hammers for rapping and dust cleaning are evenly arranged on the rapping shafts. One end of the rapping shaft assembly is provided with a driving device for providing kinetic energy and a transmission device for transmitting mechanical motion. The driving device controls the rotation of the rapping shaft assembly through the transmission device, and under the action of the rapping shaft assembly, the rapping hammers continuously rap the cathode rows arranged in the cathode frame.

[0007] Preferably, an electric porcelain rotating shaft is provided between the transmission device and the rapping shaft assembly. The rapping shaft assembly and the electric porcelain rotating shaft are connected by biting through a coupling welded to the end of the rapping shaft assembly and an electric porcelain rotating shaft pin. The electric porcelain rotating shaft serves as an insulating part between the transmission device and the rapping shaft assembly.

[0008] Preferably, the insulating sleeve includes a universal joint, a shaft sleeve, a porcelain shaft and bolts. The two ends of the porcelain shaft are fixedly bonded to the shaft sleeve by an adhesive. One end of the universal joint is connected to the flange of the shaft sleeve, and the other end is connected to the flange of the coupling at the end of the rapping shaft group by bolts.

[0009] Preferably, the insulation distance of the porcelain shaft is 250 - 450 mm. The porcelain shaft is made of 95 porcelain, with an allowable torque M ≥ 2000 N·m, capable of withstanding a DC voltage V = 100,000 volts, operating in an environment with a temperature of 80°C - 300°C, and having a white glaze on the part exposed to the flue gas.

[0010] Preferably, two adjacent rapping shafts on each rapping shaft group are fixedly welded together through a sleeve, and there is a spacing of 5 - 10 mm at the splicing end of the two rapping shafts.

[0011] Preferably, a support angle steel is fixedly connected to one side of the cathode frame, and a bearing in dust is welded and fixed above the support angle steel. The rapping shaft on the rapping shaft assembly vertically passes through the bearing in dust, and the bearing in dust is used for the support and positioning of the rapping shaft assembly.

[0012] Preferably, multiple groups of cathode rows are installed inside the cathode frame. The rapping hammers are arranged in sequence along the length direction of the rapping shaft. The rapping hammers correspond to the cathode rows one by one, and adjacent rapping hammers are staggered by a certain angle.

[0013] The present invention also provides an electrostatic precipitator, which includes a continuous side cathode rapping transmission device adopting the above electrostatic precipitator.

[0014] Advantages of the present invention: The present invention effectively solves the technical defect that the current cathode side rapping technology of single - chamber and multi - chamber electrostatic precipitators cannot be applied to the middle independent electric field of three - chamber and multi - chamber electrostatic precipitators. The number of perforations of the rapping electrodes on the dust collector body is reduced by several times, the air leakage rate is reduced, the dust removal efficiency is guaranteed, and at the same time, the driving devices are reduced by several times, and the one - time investment is greatly reduced.

[0015] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the drawings.

Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present invention for a single three - chamber electrostatic precipitator;

[0017] Figure 2 is a schematic structural diagram of the insulating sleeve of the present invention;

[0018] Figure 3 is a schematic structural diagram of the rapping shaft group of the present invention;

[0019] Figure 4 is a schematic top - view layout diagram of the side cathode rapping of an existing single two - chamber electrostatic precipitator;

[0020] Figure 5 It is a top - view layout schematic diagram of the continuous side - cathode vibration - knocking of a single - unit double - chamber electrostatic precipitator of the present invention;

[0021] Figure 6 It is a top - view layout schematic diagram of the continuous side - cathode vibration - knocking of a single - unit three - chamber electrostatic precipitator of the present invention.

[0022] Among them: 1: driving device, 2: transmission device, 3: electric porcelain rotating shaft, 4: coupling, 5: vibration - knocking hammer, 6: vibration - knocking shaft, 7: insulating sleeve, 71: universal joint, 72: bushing, 73: porcelain shaft, 74: bolt connection, 8: cathode frame, 9: bushing, 10: bearing in dust, 11: electrostatic precipitator body, 111: inlet end, 112: outlet end.

Specific Embodiment

[0023] Embodiment 1

[0024] Refer to Figures 1 to 3 The continuous side - cathode vibration - knocking transmission device of an electrostatic precipitator of the present invention includes a driving device 1, a transmission device 2, a vibration - knocking hammer 5 and a vibration - knocking shaft assembly. The vibration - knocking shaft assembly includes a plurality of vibration - knocking shaft groups arranged in sequence along its length direction. The vibration - knocking shaft groups are respectively arranged in each independent high - voltage power - supply interval of the electrostatic precipitator body 11. Between two adjacent vibration - knocking shaft groups on each vibration - knocking shaft assembly, they are connected by an insulating sleeve 7. Each vibration - knocking shaft group includes a plurality of vibration - knocking shafts 6 arranged in sequence along its length direction. A plurality of vibration - knocking hammers 5 for vibration - knocking and dust - cleaning are evenly arranged on the vibration - knocking shaft 6. One end of the vibration - knocking shaft assembly is provided with a driving device 1 for providing kinetic energy and a transmission device 2 for transmitting mechanical motion. The driving device 1 controls the rotation of the vibration - knocking shaft assembly through the transmission device 2. Under the action of the vibration - knocking shaft assembly, the vibration - knocking hammer 5 continuously vibrates - knocks the cathode rows arranged in the cathode frame 8.

[0025] Further, an electric porcelain rotating shaft 3 is provided between the transmission device 2 and the vibration - knocking shaft assembly. The vibration - knocking shaft assembly is connected with the electric porcelain rotating shaft 3 through the coupling 4 welded at the end of the vibration - knocking shaft assembly and the pin engagement of the electric porcelain rotating shaft 3. The electric porcelain rotating shaft 3 serves as an insulating part between the transmission device 2 and the vibration - knocking shaft assembly to ensure the electrical insulation performance between systems.

[0026] Further, refer to Figure 2 , in this embodiment, the insulating sleeve 7 includes a universal joint 71, a bushing 72, a porcelain shaft 73 and a bolt 74. Both ends of the porcelain shaft 73 are fixedly bonded with the bushing 72 through an adhesive. One end of the universal joint 71 is connected with the flange of the bushing 72, and the other end is connected with the flange of the coupling 4 at the end of the vibration - knocking shaft group through a bolt 74.

[0027] Furthermore, the insulation distance of the porcelain shaft 73 is 250 - 450 mm. The porcelain shaft 73 is made of 95 porcelain, with an allowable torque M ≥ 2000 N·m, capable of withstanding a DC voltage V = 100,000 volts, operating in an environment with a temperature of 80°C - 300°C, and the part exposed to the flue gas is glazed white.

[0028] Further, referring to Figure 3 , two adjacent rapping shafts 6 on each rapping shaft group are fixedly welded through a casing 9, and there is a spacing of 5 - 10 mm at the end positions where the two rapping shafts 6 are spliced.

[0029] Further, several support angle steels are installed on one side of the cathode frame 8, and a bearing in dust 10 is fixedly welded above the support angle steel. The rapping shaft 6 on the rapping shaft assembly vertically passes through the bearing in dust 10. During installation, it is ensured that the concentricity between the rapping shaft and the bearing in dust is good. The bearing in dust is used for the support and positioning of the rapping shaft assembly.

[0030] Further, multiple groups of cathode rows are installed inside the cathode frame 8. The rapping hammers 5 are arranged in sequence along the length direction of the rapping shaft. The rapping hammers 5 correspond to the cathode rows one by one, and each adjacent rapping hammer 5 is staggered by a certain angle to ensure continuous rapping of each cathode row inside the cathode frame.

[0031] Example 2

[0032] Side cathode rapping device for a single - unit double - chamber electrostatic precipitator

[0033] The existing side cathode rapping layout of a single - unit double - chamber electrostatic precipitator is shown in reference to Figure 4 . The side rapping drive devices 1 are arranged on both sides of the precipitator body 11, and corresponding platforms need to be designed for support. For an electrostatic precipitator with a multi - electric - field structure, multiple groups of drive devices 1 need to be set, resulting in a large floor area. In addition, the number of perforations for the rapping electrodes on the precipitator body 11 is large, increasing the air leakage points, the air leakage rate and the corrosion risk, and the dust removal efficiency will also be affected.

[0034] In this embodiment, the side cathode rapping layout of a single - unit double - chamber electrostatic precipitator is shown in reference to Figure 5 . An insulating sleeve 7 is arranged between the rapping shafts 6 of the left - and right double - chamber rapping shaft groups to achieve continuous rapping of the cathode system between two sets of independent high - voltage electric fields without electric field cross - connection and with high stability. In addition, the number of openings for rapping on the precipitator body 11 is reduced by half, effectively solving the problem of increased air leakage points through the wall caused by the increase in the number of perforations of the rapping electrodes. Moreover, the number of drive devices 1 is reduced by several times, and the number of support platforms for supporting the drive devices is reduced, significantly reducing the one - time cost.

[0035] Example 3

[0036] Side cathode rapping device for a single - unit triple - chamber electrostatic precipitator

[0037] In this embodiment, the arrangement mode of the side cathode rapping of a single three-compartment electrostatic precipitator refers to Figure 6 As shown, a driving device 1 and a transmission device 2 are arranged on one side of the electrostatic precipitator. The rapping shaft assembly is connected to compartments I, II, and III. The rapping shafts 6 of the rapping shaft groups between adjacent compartments are connected through insulating sleeves, effectively solving the problem that the side cathode rapping of a single three-compartment or multi-compartment electrostatic precipitator cannot be arranged currently.

[0038] The present invention also discloses an electrostatic precipitator, which adopts the above continuous side cathode rapping transmission device, can effectively solve the problem that the side cathode rapping of a single three-compartment or multi-compartment electrostatic precipitator cannot be arranged currently, greatly reduces the primary cost of the current single two-compartment side cathode rapping device, reduces the air leakage rate of the main body and ensures excellent dust removal efficiency.

[0039] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. The top drive side rapping device and technology of the electrostatic precipitator are also included. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A continuous side cathode rapping drive device for an electrostatic precipitator, characterized in that: It includes a driving device (1), a transmission device (2), a rapping hammer (5) and a rapping shaft assembly. The rapping shaft assembly includes a number of rapping shaft groups arranged in sequence along its length direction. Each rapping shaft group is respectively arranged in each independent high-voltage power supply interval of the electrostatic precipitator body (11). Adjacent two rapping shaft groups on each rapping shaft assembly are connected by an insulating sleeve (7). Each rapping shaft group includes a number of rapping shafts (6) arranged in sequence along its length direction. A number of rapping hammers (5) for rapping and dust cleaning are evenly arranged on the rapping shaft (6). One end of the rapping shaft assembly is provided with a driving device (1) for providing kinetic energy and a transmission device (2) for transmitting mechanical motion. The driving device (1) controls the rotation of the rapping shaft assembly through the transmission device (2). Under the action of the rapping shaft assembly, the rapping hammer (5) continuously raps the cathode plate installed in the cathode frame (8).

2. The continuous side cathode rapping drive device for an electrostatic precipitator according to claim 1, characterized in that: An electric porcelain rotating shaft (3) is provided between the transmission device (2) and the rapping shaft assembly. The rapping shaft assembly and the electric porcelain rotating shaft (3) are connected by the coupling (4) welded to the end of the rapping shaft assembly and the pin engagement of the electric porcelain rotating shaft (3). The electric porcelain rotating shaft (3) serves as an insulating part between the transmission device (2) and the rapping shaft assembly.

3. The continuous side cathode rapping drive device for an electrostatic precipitator according to claim 1, characterized in that: The insulating sleeve (7) includes a universal joint (71), a shaft sleeve (72), a porcelain shaft (73) and a bolt (74). The two ends of the porcelain shaft (73) are fixedly bonded to the shaft sleeve (72) by an adhesive. One end of the universal joint (71) is connected to the flange of the shaft sleeve (72), and the other end is connected to the flange of the coupling (4) at the end of the rapping shaft group by a bolt (74).

4. The continuous side cathode rapping drive device for an electrostatic precipitator according to claim 3, characterized in that: The insulating distance of the porcelain shaft (73) is 250 - 450 mm. The porcelain shaft (73) is made of 95 porcelain, with an allowable torque M≥2000 N.m, capable of withstanding a DC voltage V = 100,000 volts, a working environment temperature of 80℃ - 300℃, and the part exposed to the flue gas is glazed white.

5. The continuous side cathode rapping drive device for an electrostatic precipitator according to claim 1, characterized in that: Adjacent two rapping shafts (6) on each rapping shaft group are fixedly welded by a sleeve (9). There is a spacing of 5 - 10 mm at the end positions where the two rapping shafts (6) are spliced.

6. The continuous side cathode rapping drive device for an electrostatic precipitator according to claim 1, characterized in that: One side of the cathode frame (8) is fixedly connected with a support angle steel. A bearing in dust (10) is welded and fixed above the support angle steel. The rapping shaft (6) on the rapping shaft assembly vertically passes through the bearing in dust (10).

7. The continuous side cathode rapping drive device for an electrostatic precipitator according to claim 1, characterized in that: A number of cathode rows are installed in the cathode frame (8). The rapping hammers (5) are arranged in sequence along the length direction of the rapping shaft. The rapping hammers (5) correspond to the cathode rows one by one, and adjacent rapping hammers (5) are staggered by a certain angle.

8. An electrostatic precipitator, characterized in that: It includes a continuous side cathode rapping transmission device of an electrostatic precipitator adopting any one of the claims 1 - 7.

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