Cathode wire of electric dust remover

Abstract

The utility model relates to a cathode wire of an electric dust remover, which comprises a cathode wire tube 10 and a plurality of spray points 20, and the spray points 20 are arranged on the tube wall of the cathode wire tube 10 along a distributed spiral line 30. The utility model has the beneficial effects that the spray points arranged along the spiral line are adopted, and the arrangement of the spray points is optimized, so that the field intensity distribution is more uniform, the dust removal effect of the electric dust remover is improved, the number of the spray points is reduced, and the structure of the cathode line is improved.

Description

Technical Field

[0001] The utility model relates to electric dust removal equipment, in particular to a cathode line of an electric dust remover. Background Art

[0002] The honeycomb tube wet electrostatic precipitator has the advantages of high fine dust removal efficiency, no secondary dust, simple operation, no moving parts, low maintenance cost, etc. It can work below the flue gas dew point temperature. It has a compact structure and diversified forms. It can be combined with other flue gas treatment equipment to meet the needs of various flue gas purification. The cathode wire charges the dust through the corona effect and is one of the core components of the wet electrostatic precipitator system. The structural form of the cathode wire directly affects the dust removal efficiency of the wet electrostatic precipitator. In the prior art, the cathode forms that are more commonly used in wet electrostatic precipitators include fishbone needle type and sawtooth type. Among them, the fishbone needle type has a good discharge effect but is prone to damage during installation and operation, and has poor reliability. The Chinese utility model patent (application number 2015207167655) discloses a cathode wire for a wet electrostatic precipitator. The discharge needle penetrates the cathode rod and is locked on the cathode rod through a locking nut, which is easy to install and replace, and has good rigidity, high strength, and is not easy to damage. However, the discharge needles are aligned in a cross shape on the cathode rod, and the contact between the cathode rod and the airflow is poor in the axial direction, which will affect the dust removal effect. Summary of the invention

[0003] The utility model aims to provide a cathode line of an electrostatic precipitator and optimize the setting of a discharge needle.

[0004] In order to achieve the above purpose, the technical solution of the utility model is: an electrostatic precipitator cathode line, including a cathode line tube 10 and a discharge needle 20, and a plurality of the discharge needles 20 are arranged on the tube wall of the cathode line tube 10 along a distribution spiral line 30.

[0005] Furthermore, in order to evenly distribute the plurality of discharge needles, the plurality of discharge needles are equidistantly arranged over the entire length of the distribution spiral line.

[0006] Furthermore, in order to avoid axial overlap of the discharge needles, the distribution spiral is a full-circle spiral, and the number of discharge needle intervals along the distribution spiral is the number of discharge needles minus 1, and the number of discharge needle intervals cannot be divided by the number of turns of the distribution spiral, nor can it be divided by a divisor of the number of coils of the distribution spiral.

[0007] Furthermore, a preferred arrangement of discharge needles is that the distribution spiral is a full-circle spiral, the number of discharge needle intervals along the distribution spiral is the number of discharge needles minus 1, the number of turns of the distribution spiral is a prime number, and the number of discharge needle intervals cannot be divided by the number of turns of the distribution spiral.

[0008] Furthermore, a discharge needle installation structure is that the cathode wire tube is provided with a plurality of discharge needle holes 11 arranged along a distribution spiral line, and the tail end of the discharge needle is inserted into the discharge needle hole and welded to the cathode wire tube.

[0009] Furthermore, another installation structure of the discharge needle is that the cathode line tube is provided with a plurality of discharge needle screw holes 12 arranged along a distribution spiral line, and the tail end of the discharge needle is provided with a thread 21 screwed into the discharge needle screw hole.

[0010] Furthermore, for the convenience of manufacturing, the cathode tube is provided with distributed spiral engraved lines 30 on the tube wall.

[0011] The beneficial effects of the utility model are as follows: the discharge needles arranged along the distribution spiral lines are adopted, the arrangement of the discharge needles is optimized, the field strength distribution is made more uniform, the dust removal effect of the electrostatic precipitator is improved, the number of discharge needles is reduced, and the structure of the cathode line is improved.

[0012] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the structural diagram of the utility model, which adopts 8 full-circle distributed spiral lines;

[0014] Figure 2 It is a schematic diagram of the structural decomposition of the cathode line tube and the discharge needle of the utility model;

[0015] Figure 3 This is a cross-sectional view of the utility model observed along the axial direction of the cathode wire tube, in which the discharge needle is welded to the cathode wire tube;

[0016] Figure 4 It is a schematic diagram of the arrangement of the discharge needles of the utility model on the distribution spiral line;

[0017] Figure 5 This is a view of the distribution of discharge needles along the circumference of the cathode line tube of the utility model;

[0018] Figure 6 This is a structural diagram of the utility model in which the discharge needle is installed by thread;

[0019] Figure 7 This is a structural exploded view of the utility model in which the discharge needle is threadedly installed;

[0020] Figure 8 The utility model has a structure diagram in which the distributed spiral line is a 7-round spiral line;

[0021] Fig. 9 yes Figure 7 A view of the mechanism's discharge needles distributed along the circumference of the cathode line tube;

[0022] Fig.10 This is a schematic diagram of the structure of the utility model in which the number of distributed spiral coils is 8 and the number of discharge needle intervals is 24;

[0023] Fig.11 This is a schematic diagram of the structure of the utility model in which the number of distributed spiral coils is 8 and the number of discharge needle intervals is 20. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] like Figures 1 to 5 , a cathode wire of an electrostatic precipitator, including a cathode wire tube 10 and a discharge needle 20.

[0026] In this embodiment, 20 discharge needles 20 are arranged on the tube wall of the cathode ray tube 10 along the distribution spiral line 30 .

[0027] The distribution spiral line 30 may be a virtual spiral line, or a spiral line engraved on the wall of the cathode ray tube.

[0028] In this embodiment, the distribution spiral line 30 is a spiral line with 8 full turns, and 20 discharge needles are arranged at equal distances along the entire length of the distribution spiral line. Figure 1 As shown, the discharge needle 2 a and the discharge needle 2 e are respectively arranged at two ends of the distribution spiral line 30 , and the discharge needle 2 a and the discharge needle 2 e are located at the same circumferential position on the tube wall of the cathode ray tube 10 .

[0029] like Figure 4 Part of the discharge needles and the distribution spiral are shown, and the four discharge needles are marked as 20a, 20b, 20c, and 20d. Along the distribution spiral, the length of the discharge needle interval between the discharge needle 20a and the discharge needle 20b is L1, the length of the discharge needle interval between the discharge needle 20b and the discharge needle 20c is L2, and the length of the discharge needle interval between the discharge needle 20c and the discharge needle 20d is L3. The lengths of the three discharge needle intervals are equal, that is, L1=L2=L3.

[0030] The number of discharge needle intervals along the distribution spiral is the number of discharge needles minus 1, that is, 20 discharge needles have 19 equally spaced discharge needle intervals. The distribution spiral is a full-circle spiral of 8 turns. The distribution spiral 30 rotates 8 turns, and the total angular rotation stroke is 360°×8=2880°, which is divided into 19 discharge needle intervals. The angular stroke α of each discharge needle interval is 2880°÷19=151.58°. Such a distribution of discharge needles 20 makes the discharge needles form 19 equally divided positions in the axial direction of the cathode tube 10. Therefore, except for the overlap of the positions of the discharge needles 2a and 2e at both ends of the distribution spiral 30, the circumferential equal distribution of the 19 discharge needles is achieved, and the phase angle β of adjacent discharge needles is 360°÷19=18.95°.

[0031] The discharge needle arrangement of this embodiment realizes uniform distribution of the discharge needles in space. Multiple discharge needles do not overlap in the circumferential direction or in the axial direction. When airflow passes through, conditions for contact between the discharge needles and the airflow can be provided to the maximum extent, thereby giving full play to the dust removal function of each discharge needle.

[0032] In order to achieve a maximum of discharge needles to be evenly distributed around the circumference, a reasonable number, i.e., a reasonable number of discharge needle intervals, should be set. Avoid the number of discharge needle intervals being evenly divided by the number of turns of the distribution spiral. For example, if the number of turns of the distribution spiral in this embodiment is 8, if 25 discharge needles are evenly distributed along the distribution spiral, the number of discharge needle intervals is 24, and there are 24 discharge needle interval segments. The angular travel α of each discharge needle interval segment is 2880°÷24=120°. Fig.10 As shown, multiple discharge needles are arranged overlappingly at positions equally divided on the circumference of a circle, and the phase angle β between adjacent discharge needles is also 120°, which obviously does not provide the conditions for good airflow contact.

[0033] In addition, the number of discharge needle intervals should not be divisible by the divisor of the number of distribution spiral coils. If 21 discharge needles are set equally along the distribution spiral line, the number of discharge needle intervals is 20, there are 20 discharge needle interval segments, 4 is a divisor of 20, and in the distribution of discharge needles, the angular travel of each discharge needle interval segment is 2880°÷20=144°. Fig.11 As shown, multiple discharge needles will be arranged overlappingly at positions equally divided on the circumference of the circle, and there will be no good airflow contact conditions.

[0034] It can be seen that when the number of distributed spiral coils and the number of discharge needle intervals have an integer common divisor, multiple discharge needles will appear in overlapping positions on the circumference. As shown above, when the number of discharge needle intervals is 24, the number of distributed spiral coils 8 and the number of discharge needle intervals 24 have a common divisor of 8, which is 1 / 3 after reduction, so multiple discharge needles appear in overlapping positions on the three equal parts of the circle, and the discharge needles overlap once on the circumference every circle. When the number of electric needle intervals is 20, the number of distributed spiral coils 8 and the number of discharge needle intervals 20 have a common divisor of 4, which is 2 / 5 after reduction, so multiple discharge needles appear in overlapping positions on the five equal parts of the circle, and the discharge needles overlap once on the circumference every two circles.

[0035] Therefore, when designing the number of discharge needles, it should be noted that the number of discharge needle intervals cannot be divided by the number of turns of the distribution spiral line, nor can it be divided by the divisor of the number of the distribution spiral coils.

[0036] In this embodiment, the cathode line tube is provided with 20 discharge pinholes 11 arranged along the distribution spiral line, and the tail end of the discharge needle is inserted into the discharge pinhole and welded to the cathode line tube. Such a structure is convenient for manufacturing. First, 20 discharge pinholes 11 arranged along the distribution spiral line 30 are processed on the cathode line tube 10 to determine the distribution positions of multiple discharge needles, and then the discharge needle 20 is welded to the cathode line tube 10 to complete the manufacturing of the cathode line.

[0037] Embodiment 2:

[0038] like Figure 6 , Figure 7 , a cathode wire of an electrostatic precipitator, this embodiment is a structural replacement of the first embodiment, including a cathode wire tube 10 and a discharge needle 20.

[0039] In this embodiment, the cathode tube 10 is provided with a plurality of discharge needle screw holes 12 arranged along the distribution spiral line, and the tail end of the discharge needle 20 is provided with a thread 21, and the discharge needle is screwed into the discharge needle screw hole 12 through the thread 21, so that the discharge needle is installed on the cathode tube 10. The discharge needle is fixed to the cathode tube 10 by a nut 22.

[0040] This embodiment realizes a detachable discharge needle structure, which facilitates the installation and replacement of the discharge needle.

[0041] Embodiment three:

[0042] like Figure 8 , Fig. 9 , a cathode wire of an electrostatic precipitator, this embodiment is a structural replacement of the first embodiment, including a cathode wire tube 10 and a discharge needle 20. Twenty discharge needles 20 are arranged on the tube wall of the cathode wire tube 10 along a distribution spiral line 30.

[0043] In the first embodiment, the distribution spiral line 30 is a spiral line with 8 full turns, and 20 discharge needles are arranged at equal intervals along the entire length of the distribution spiral line. The number of turns of the distribution spiral line is 8.

[0044] 8 is an even number divisible by 2 or 4. As described in the first embodiment, it is not suitable to set 25 discharge needles (the number of discharge needle intervals is 24) or 21 discharge needles (the number of discharge needle intervals is 20). Similarly, the use of 8-turn distribution spiral is not suitable for setting 23 discharge needles (the number of discharge needle intervals is 22) or 19 discharge needles (the number of discharge needle intervals is 8). If 21 discharge needles are needed to form 20 discharge needles equally distributed on the circumference of the adjacent discharge needles with a phase angle of 18°, the structure of the distribution spiral 30 needs to be changed.

[0045] In this embodiment, the distribution spiral is a 7-turn spiral, that is, the number of turns of the distribution spiral is 7, the number of turns of the distribution spiral 7 is a prime number, and the number of discharge needle intervals is not divisible by 7 (the number of turns of the distribution spiral), so that multiple discharge needles can be evenly distributed around the circumference.

[0046] This embodiment still uses 21 discharge needles, that is, the number of discharge needle intervals is 20, and the number of discharge needle intervals cannot be divided by the number of turns of the distribution spiral line, so that 20 discharge needles are evenly distributed on the circumference, and the angular stroke α of each discharge needle interval is 126°, and the phase angle β between adjacent discharge needles is 18°.

[0047] The utility model adopts the structure of the discharge needle arranged along the distribution spiral line, optimizes the arrangement of the discharge needle, can improve the contact efficiency between the discharge needle and the airflow, has good discharge effect, uniform field strength distribution, avoids corona dead zone, and can improve the dust collection efficiency of the wet electrostatic precipitator. It can also reduce the number of discharge needles and improve the structure of the cathode line of the electrostatic precipitator under the condition of the same dust removal effect.

Claims

1. An electrostatic precipitator cathode wire, comprising a cathode wire tube (10) and a discharge needle (20), characterized in that: A plurality of discharge needles (20) are arranged on the tube wall of the cathode line tube (10) along a distribution spiral line (30), and the plurality of discharge needles are arranged at equal intervals over the entire length of the distribution spiral line.

2. The cathode line of the electrostatic precipitator according to claim 1, characterized in that: The distribution spiral is a full-circle spiral. The number of discharge needle intervals along the distribution spiral is the number of discharge needles minus 1. The number of discharge needle intervals cannot be divided by the number of turns of the distribution spiral, nor can it be divided by a divisor of the number of coils of the distribution spiral.

3. The cathode wire of the electrostatic precipitator according to claim 1, characterized in that: The distribution spiral is a full-circle spiral, the number of discharge needle intervals along the distribution spiral is the number of discharge needles minus 1, the number of turns of the distribution spiral is a prime number, and the number of discharge needle intervals cannot be divided by the number of turns of the distribution spiral.

4. The cathode wire of the electrostatic precipitator according to claim 1, characterized in that: The cathode wire tube is provided with a plurality of discharge pinholes (11) arranged along a distribution spiral line, and the tail end of the discharge needle is inserted into the discharge pinhole and welded to the cathode wire tube.

5. The cathode line of the electrostatic precipitator according to claim 1, characterized in that: The cathode line tube is provided with a plurality of discharge needle screw holes (12) arranged along a distribution spiral line, and the tail end of the discharge needle is provided with a thread (21) that is screwed into the discharge needle screw hole.

6. The cathode wire of the electrostatic precipitator according to claim 1, characterized in that: The cathode line tube has a wall provided with distributed spiral engraved lines (30).

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