An adjustable cathode system and dust collector

Abstract

The present invention discloses an adjustable cathode system and a dust collector, wherein the cathode system comprises a cathode wire, an upper cathode beam and a lower cathode beam, wherein the cathode wire is vertically and spaced apart between the upper cathode beam and the lower cathode beam, and a discharge needle is distributed on each cathode wire, and a hollow main mast is provided between the upper cathode beam and the lower cathode beam, wherein the cathode wire is located in the inner cavity of the main mast, and its lower end is connected to the lower cathode beam through a spring, and its upper end is connected to a lifting and adjusting device; the discharge needle is an elastic needle-piercing wire, and the main mast is provided with a needle hole corresponding to each elastic needle-piercing wire; when the lifting and adjusting device lifts or lowers the cathode wire, the elastic needle-piercing wire can be retracted or extended into the main mast. The cathode system can avoid direct contact between the cathode wire and the flue gas, and can adjust the discharge spacing to meet the needs of different working conditions, and can also avoid the cathode wire from being broken due to vibration and ash cleaning.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly dust removal for flue gas, and in particular to an adjustable cathode system applied to a dust collector. The present invention also relates to a dust collector provided with the adjustable cathode system. Background Art

[0002] The existing power plant dust removal equipment generally adopts electrostatic precipitator, bag dust collector, and electric bag composite dust collector. The electric field area of ​​the electrostatic precipitator and the electric bag composite dust collector consists of an anode system, a cathode system and a vibration cleaning device. The cathode system consists of a cathode wire, a cathode frame, and a cathode suspension. Its working principle is that two metal anodes and cathodes with a large difference in curvature radius are connected by high-voltage direct current to establish an electrostatic field sufficient to ionize the gas. The electrons, anions, and cations generated after the gas is ionized are adsorbed on the dust particles passing through the electric field, so that the dust is charged. Under the action of the electric field force, the charged dust moves to the electrode with opposite polarity and deposits on the electrode, so that the dust and gas are separated. The dust on the electrode is collected by vibration and other methods.

[0003] The cathode wire and cathode frame of the existing cathode system are in rigid contact. During vibration cleaning, the cathode wire and the frame vibrate at the same time due to the vibration force, and the dust attached to the cathode wire is knocked off. After long-term operation, due to the vibration and impact force during vibration, as well as the continuous scouring of flue gas and dust, the weld between the cathode wire and the frame will break, the cathode wire tension will be insufficient, the cathode wire will be deformed, the discharge electrode will be broken, etc., causing damage to the cathode system and then causing the entire electric field to short-circuit, resulting in poor dust removal effect and other consequences.

[0004] In addition, the quality of coal burned in power plants is unstable, sometimes good and sometimes bad. The size and viscosity of the dust produced by burning different coals are completely different. Coupled with the ammonia leakage of the economizer before the dust collector, the viscosity of the dust increases. Vibration cleaning alone cannot meet the normal cleaning effect of the electric field cathode.

[0005] A cathode frame and a wet electrostatic precipitator, which drive the cathode wire to move by a pushing member, and can change the dust removal efficiency of the precipitator by adjusting the distance from the cathode wire to the anode plate. However, the vibration and impact force during vibration, as well as the fracture of the weld between the cathode wire and the frame caused by flue gas and dust scouring, insufficient tension of the cathode wire, deformation of the cathode wire, and disconnection of the discharge electrode cannot be effectively solved.

[0006] Another cathode device of an electrostatic precipitator is flexibly connected to the frame at one end of the pole wire and rigidly connected to the frame at the other end. This can effectively solve the problem of pole wire deformation caused by thermal expansion and contraction. After the cathode vibrates the frame through the flexible connection, the vibration force transmitted to the pole wire will inevitably weaken, resulting in a weakened cleaning effect. It will make it impossible to effectively remove the dust accumulated on the cathode wire, which will ultimately affect the electric field dust removal efficiency. Summary of the invention

[0007] The object of the present invention is to provide an adjustable cathode system to solve at least one of the above-mentioned technical problems existing in the existing cathode system.

[0008] Another object of the present invention is to provide a dust collector provided with the adjustable cathode system.

[0009] To achieve the above-mentioned purpose, the present invention provides an adjustable cathode system, including a cathode wire and an upper cathode beam and a lower cathode beam for installing the cathode wire, the cathode wire is vertically and spaced apart between the upper cathode beam and the lower cathode beam, a discharge needle is distributed on each cathode wire, a hollow main mast is provided between the upper cathode beam and the lower cathode beam, the cathode wire is located in the inner cavity of the main mast, the lower end of the cathode wire is connected to the lower cathode beam through a spring, and the upper end of the cathode wire is connected to a lifting and adjusting device; the discharge needle is an elastic needle wire, and the main mast is provided with needle holes corresponding to each elastic needle wire; when the lifting and adjusting device lifts or lowers the cathode wire, the elastic needle wire can retract or extend into the inside of the main mast.

[0010] Optionally, the main mast is a hollow tube.

[0011] Optionally, the upper and lower ends of the main mast are respectively connected and fixed to the lower surface of the upper cathode beam and the upper surface of the lower cathode beam.

[0012] Optionally, the main mast is provided with a high temperature resistant rubber ring at each pinhole.

[0013] Optionally, the upper cathode beam is provided with adjustment holes corresponding to each main mast, and the upper end of the cathode wire passes through the adjustment hole to be connected to the lifting adjustment device.

[0014] Optionally, the upper cathode beam is provided with a sealing sleeve at the adjustment hole.

[0015] Optionally, the cathode wire is located in a closed space surrounded by the upper cathode beam, the main mast, the lower cathode beam and the sealing sleeve.

[0016] Optionally, a mounting hole is provided on the cathode wire, and the elastic needle-piercing wire transversely passes through the mounting hole and is fixedly connected to the cathode wire, with the discharge needles formed at both ends thereof.

[0017] Optionally, the elastic needle-punched thread is an elastic metal conductive material with shape memory properties.

[0018] To achieve the above-mentioned other object, the present invention provides a dust collector, comprising a cathode system and an anode system, wherein the cathode system is the adjustable cathode system described in any one of the above-mentioned items.

[0019] The adjustable cathode system provided by the present invention has a hollow main mast between the upper cathode beam and the lower cathode beam. The cathode wire can not only be hidden inside the main mast to avoid direct contact between the cathode wire and the flue gas, but also the upper end of the cathode wire is connected to the adjustable lifting device, and the lower end is connected to the spring. The elastic needle wire extends from the needle hole opened in the main mast, and the elastic needle wire can be extended or retracted from the main mast through the lifting device. In this way, not only can the discharge spacing be adjusted to meet the needs of different working conditions, but the spring structure can also prevent the cathode wire from breaking due to vibration cleaning. In addition, the telescopic discharge needle can be cleaned separately through the telescopic action. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an adjustable cathode system provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of

[0022] Figure 3 It is a schematic diagram of the shape change of the elastic needle-punched wire after the cathode wire is lifted by the lifting adjustment device;

[0023] Figure 4 for Figure 3 A partial enlarged view of;

[0024] Figure 5 A partial schematic diagram of a pinhole being opened on the main mast;

[0025] Figure 6 A partial schematic diagram of opening an adjustment hole for the upper cathode beam and setting a sealing sleeve.

[0026] In the figure:

[0027] 1. Upper cathode beam 2. Main mast 3. Cathode wire 4. Lower cathode beam 5. Elastic needle wire 6. Spring 7. Lifting adjustment device 21. High temperature resistant rubber ring 22. Sealing sleeve. DETAILED DESCRIPTION

[0028] 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.

[0029] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0030] Please refer to Figure 1 , Figure 2 , Figure 1 A schematic structural diagram of an adjustable cathode system provided by an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of .

[0031] As shown in the figure, in a specific embodiment, the adjustable cathode system provided by the present invention is used for a dust collector, which is mainly composed of an upper cathode beam 1, a main mast 2, a cathode wire 3, a lower cathode beam 4, an elastic needle wire 5, a spring 6, a lifting adjustment device 7, a high temperature resistant rubber ring 21, a sealing sleeve 22 and other components.

[0032] The upper cathode beam 1 and the lower cathode beam 4 are parallel to each other, the main mast 2 is a hollow pipe, and multiple main masts are vertically and spaced apart from each other between the upper cathode beam 1 and the lower cathode beam 4. The two ends of each main mast 2 are respectively welded and fixed to the upper cathode beam 1 and the lower cathode beam 4, and the cathode wire 3 is located in the inner cavity of the main mast 2.

[0033] The upper cathode beam 1 is provided with adjustment holes, which are arranged at intervals along the length direction of the upper cathode beam 1 according to the arrangement direction of the cathode wire; the upper end of the cathode wire 3 passes through the main mast 2 and passes through the adjustment hole of the upper cathode beam 1 to be connected with the lifting adjustment device 7, the lower end of the cathode wire 3 is fixedly connected to one end of the spring 6, and the other end of the spring 6 is fixedly connected to the lower cathode beam.

[0034] The lifting and adjusting device 7 can be a gear rack mechanism driven by a motor, or a winch mechanism or other mechanical device capable of lifting the cathode line 3 upward or downward. Since it can be realized by adopting general technology, it will not be described in detail in this article.

[0035] A plurality of mounting holes are provided at equal intervals on the cathode wire 3, and the mounting holes are used to insert the elastic needle wire 5. Each elastic needle wire 5 passes through the mounting hole and is rigidly connected and fixed to the cathode wire 3, and the two ends thereof form discharge needles. The elastic needle wire 5 is an elastic metal conductive material with shape memory performance, which has strong elastic deformation ability after being stressed, can restore the original shape after the stress is released, has high elastic limit, fatigue limit, impact toughness and good heat treatment performance, etc. For example, it can be carbon spring steel, alloy spring steel, stainless spring steel, copper alloy, nickel alloy, etc. After being made into the elastic needle wire 5, it has two states during use, one is a horizontal straight state, and the other is a state of deformation into an S shape when subjected to tension or pressure.

[0036] The upper and lower ends of the main mast 2 are respectively connected and fixed to the lower surface of the upper cathode beam 1 and the upper surface of the lower cathode beam 4. The main mast 2 is provided with a needle hole for passing the elastic needle thread 5. The elastic needle thread 5 passes through the needle hole of the main mast 2 and is exposed to the flue gas.

[0037] Please refer to Figure 5 , Figure 6 , Figure 5 A partial schematic diagram of a pinhole being opened on the main mast; Figure 6 A partial schematic diagram of opening an adjustment hole for the upper cathode beam and setting a sealing sleeve.

[0038] The main mast 2 is provided with a high temperature resistant rubber ring 21 in the mounting hole. By installing the high temperature resistant rubber ring 21, the elastic needle thread 5 can be prevented from directly contacting and generating friction with the inner wall of the mounting hole of the main mast 2 when extending or retracting, and also plays a sealing role.

[0039] The upper cathode beam 1 is provided with a sealing sleeve 22 at its adjustment hole. The sealing sleeve 22 is fixedly connected to the upper cathode beam by sealant or other means. The sealing sleeve 22 is provided with an opening matching the diameter of the cathode wire 3. The cathode wire 3 passes through the sealing sleeve 22 and is connected to the lifting adjustment device 7.

[0040] Under the combined pulling force of the lifting and adjusting device 7 and the lower spring 6, the cathode wire 3 is in a tensioned state, and the cathode wire 3 is always in a closed space surrounded by the upper cathode beam 1, the main mast 2, the lower cathode beam 4, and the sealing sleeve 22, and is not in direct contact with the flue gas, thereby avoiding dust accumulation on the cathode wire 3 and avoiding dust erosion that may cause the cathode wire 3 to break. The cathode wire 3 has a higher structural strength than the cathode wire of a conventional cathode system.

[0041] Moreover, when the cleaning and vibrating mechanism is working, it mainly acts on the upper cathode beam 1 and the lower cathode beam 4 to perform vibrating and cleaning. The elastic needle wire 5 is connected to the lower cathode beam through the spring 6, which can offset the effect of the vibrating force on the cathode wire 3 and effectively avoid the cathode wire 3 from breaking due to vibration.

[0042] like Figure 3 , Figure 4 As shown, under normal operation of the electric field, the cathode wire 3 is in a tensioned state under the joint action of the lifting adjustment device 7 and the spring 6. Since the cathode wire 3 is always in a closed space surrounded by the upper cathode beam 1, the main mast 2, the lower cathode beam 4, and the sealing sleeve 22, it is not in direct contact with the flue gas. Therefore, dust accumulation on the cathode wire 3 can be avoided.

[0043] When the elastic needle-punched wire 5 is in a straight state, the elastic needle-punched wire 5 has no dust accumulation, and the distance between the elastic needle-punched wire 5 and the anode plates on the left and right sides is equal, the discharge effect of the electric field area is good, and the dust removal efficiency is high; after running for a fixed period of time, the control program starts the lifting adjustment device 7 to act on the cathode wire 3, lifting the cathode wire 3 up to a fixed stroke height, and the elastic needle-punched wire 5 moves upward under the action of tension. Under the constraint of the high-temperature resistant rubber ring 21 on the main mast 2, the elastic needle-punched wire 5 produces elastic deformation, so that the elastic needle-punched wire 5 elastically retracts into the main mast 2. In this process, the dust attached to the elastic needle-punched wire 5 can be removed by the high-temperature resistant rubber ring 21, so as to achieve the effect of removing the dust separately.

[0044] After a lifting procedure is completed, the lifting adjustment device 7 is closed, the cathode wire 3 automatically returns to its original position through the elastic force of the bottom spring 6, and the elastic needle wire 5 moves downward under the downward force. Under the action of the high temperature resistant rubber ring 21 on the main mast 2, the elastic deformation of the elastic needle wire 5 slowly recovers until it returns to a straight state.

[0045] When the cleaning and rapping mechanism acts on the upper cathode beam 1 and / or the lower cathode beam 4 for rapping and cleaning, since the elastic needle wire 5 and the lower cathode beam 4 are flexibly connected by the spring 6, the effect of the rapping force on the cathode wire 3 can be offset, so that the rapping and cleaning and the cathode wire discharge do not interfere with each other, thereby avoiding the cathode wire 3 breaking at the welding position under the long-term action of the rapping force and causing a broken wire.

[0046] In order to improve the dust removal efficiency, more and more dust collectors are increasing the distance between the cathode wire and the anode plate to increase the working voltage and increase the electric field strength. In addition, the number of cathode wires and anode plates is reduced as much as possible to reduce the equipment weight. However, the increase in voltage and insulation level will increase the corresponding cost. The selection of the electrode spacing is related to the nature of the dust. After the optimal discharge electrode spacing is determined through selection, the discharge distance between the cathode wire 3 and the anode plate can be adjusted by lifting the adjustment device 7, so that the two can always be kept at the optimal discharge spacing to ensure the best electric field discharge effect.

[0047] The elastic needle-punched wire 5 has good deformation and recovery capabilities, and the cathode needle-punched wire 5 can be cleaned separately online, which is better than the conventional cleaning method that can only be done by vibration, and prevents the elastic needle-punched wire 5 from reducing the discharge effect due to enlargement of the discharge needle due to dust accumulation.

[0048] In addition, the main mast 2, the cathode wire 3, the elastic needle wire 5, and the spring 6 can be assembled in a workshop and then transported to the site, which helps to reduce the workload of on-site installation.

[0049] In addition to the above-mentioned adjustable cathode system, the present invention also provides a dust collector having a cathode system and an anode system, wherein the cathode system is the adjustable cathode system described above. Regarding the remaining structure of the dust collector, please refer to the prior art and will not be described in detail herein.

[0050] The above is a detailed introduction to the adjustable cathode system and dust collector 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 core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An adjustable cathode system, comprising a cathode line (3) and an upper cathode beam (1) and a lower cathode beam (4) for mounting the cathode line (3), wherein the cathode line (3) is vertically and spaced apart from each other between the upper cathode beam (1) and the lower cathode beam (4), and each cathode line (3) is provided with a discharge needle, characterized in that: A hollow main mast (2) is provided between the upper cathode beam (1) and the lower cathode beam (4); the cathode wire (3) is located in the inner cavity of the main mast (2); its lower end is connected to the lower cathode beam (4) via a spring (6); and its upper end is connected to a lifting and adjusting device (7); the discharge needle is an elastic needle piercing wire (5); the main mast (2) is provided with a needle hole corresponding to each elastic needle piercing wire (5); the lifting and adjusting device (7) is used to lift or lower the cathode wire (3) so that the elastic needle piercing wire (5) can be retracted or extended into the main mast (2); the upper cathode beam (1) is provided with an adjusting hole corresponding to each main mast (2); the upper end of the cathode wire (3) passes through the adjusting hole and is connected to the lifting and adjusting device (7).

2. The adjustable cathode system according to claim 1, characterized in that The main mast (2) is a hollow pipe.

3. The adjustable cathode system according to claim 1, characterized in that The upper and lower ends of the main mast (2) are respectively connected and fixed to the lower surface of the upper cathode beam (1) and the upper surface of the lower cathode beam (4).

4. The adjustable cathode system according to claim 1, characterized in that The main mast (2) is provided with a high temperature resistant rubber ring (21) at each pinhole.

5. The adjustable cathode system according to claim 1, characterized in that The upper cathode beam (1) is provided with a sealing sleeve (22) at the adjustment hole.

6. The adjustable cathode system according to claim 5, characterized in that The cathode wire (3) is located in a closed space surrounded by the upper cathode beam (1), the main mast (2), the lower cathode beam (4), and the sealing sleeve (22).

7. The adjustable cathode system according to claim 1, characterized in that The cathode wire (3) is provided with a mounting hole, the elastic needle-piercing wire (5) passes through the mounting hole transversely and is fixedly connected to the cathode wire (3), and the two ends of the elastic needle-piercing wire respectively form the discharge needles.

8. The adjustable cathode system according to any one of claims 1 to 7, characterized in that The elastic needle-punched thread (5) is an elastic metal conductive material having shape memory properties.

9. A dust collector comprising a cathode system and an anode system, characterized in that: The cathode system is an adjustable cathode system as claimed in any one of claims 1 to 8.

Images