Dual corona pole electrostatic precipitator and method

Abstract

The application discloses a double-corona-pole electrostatic dust removal device and method, and the device comprises a grounded dust collection electrode plate, a main corona pole and an auxiliary corona pole; wherein the arrangement direction of the dust collection electrode plate is parallel to the flue gas flow direction and the dust collection electrode plate is arranged at both sides of the inside of the device; the arrangement direction of the main corona pole is parallel to the flue gas flow direction and the main corona pole is arranged at the center position of the inside of the device and is connected with a first negative direct-current high-voltage power supply; the arrangement direction of the auxiliary corona pole is parallel to the flue gas flow direction, the auxiliary corona pole is arranged at both sides of the main corona pole and is close to the position of the dust collection electrode plate, and the auxiliary corona pole is connected with a second negative direct-current high-voltage power supply; the auxiliary corona pole comprises an auxiliary pole wire, and one side of the auxiliary pole wire towards the center of the channel is wrapped with an insulating material.

Description

Technical Field

[0001] This invention belongs to the technical field of electrostatic precipitators, specifically relating to a dual-corona electrode electrostatic precipitator device and method. Background Technology

[0002] Electrostatic precipitators are currently the most commonly used type of industrial dust collector in the field of industrial dust removal. Due to their advantages such as low resistance, low energy consumption, and high efficiency, they are widely used in industrial furnace flue gas dust removal and related fields.

[0003] Electrostatic precipitators work by generating a high-voltage electric field between the corona electrode and the collecting electrode using a high-voltage DC power supply. This field charges dust particles in the flue gas flowing through the gas, which then move towards the collecting electrode under the influence of the electric field, thus purifying the flue gas. Traditional electrostatic precipitators with a wire-plate structure can effectively collect dust under operating voltages of 50kV~60kV. However, as the distance between the corona electrode and the collecting electrode increases, the electric field strength decreases sharply, which is detrimental to the movement of charged dust particles. Furthermore, the particle velocity gradually decreases, and some charged dust particles cannot be captured by the collecting electrode, preventing the electrostatic precipitator from achieving high dust removal efficiency.

[0004] Since the industrial application of electrostatic precipitators, improvements and enhancements in electrode structure have become the decisive factors affecting the development of electrostatic precipitator technology. Conventional electrostatic precipitators still have technical problems such as low electric field strength near the dust collection plate, poor uniformity of electric field distribution, and insufficient charging effect on fine particles. Summary of the Invention

[0005] In view of this, the main objective of the present invention is to provide a dual-corona electrode electrostatic dust removal device and method.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A dual-corona electrode electrostatic dust removal device includes a grounded dust collection plate, a main corona electrode, and an auxiliary corona electrode; The dust collecting plates are arranged parallel to the flue gas flow direction and are located on both sides inside the device. The main corona electrode is arranged parallel to the flue gas flow direction and is located in the center of the device, connected to the first negative DC high voltage power supply. The auxiliary corona electrode is arranged parallel to the flue gas flow direction, located on both sides of the main corona electrode and close to the dust collection electrode plate, and is connected to the second negative DC high voltage power supply. The auxiliary corona electrode includes an auxiliary electrode wire, and the side of the auxiliary electrode wire facing the center of the channel is wrapped with insulating material.

[0007] Preferably, the auxiliary electrode wire includes a round steel electrode wire; the insulating material is wrapped on one side of the round steel electrode wire to block the interference electric field generated in the direction of the channel center and to weaken the electric field generated by the auxiliary electrode wire in that direction.

[0008] Preferably, the diameter of the round steel electrode is Φ3~Φ8; the insulating material is a high resistivity insulating material, selected from materials with a resistivity of... Silicone rubber, resistivity Polytetrafluoroethylene or with a resistivity of Any one of the 95 porcelain types.

[0009] Preferably, the round steel electrode wire and insulating material are bonded together using a high-strength adhesive.

[0010] Preferably, the corona electrode wires of the main corona electrode and the auxiliary electrode wires of the auxiliary corona electrode are arranged alternately to avoid mutual interference between the two sets of corona electrodes and the squeezing of the electric field lines.

[0011] Preferably, the number of dust collecting plates is set to 2 rows; the number of main corona electrodes is set to 1 row; and the number of auxiliary corona electrodes is set to 2 rows.

[0012] Preferably, the first negative DC high voltage power supply provides a secondary voltage of 30~60kV to the main corona electrode to generate a parallel main electric field; the second negative DC high voltage power supply provides an operating voltage of 20~40kV to the auxiliary corona electrode to generate an auxiliary enhanced electric field near the electrode plate region.

[0013] A highly efficient dust removal method based on the aforementioned dual-corona electrode electrostatic precipitator, the method comprising the following steps: Step 1, primary acceleration of the main electric field: Turn on the first negative DC high voltage power supply to energize the main corona electrode, forming a parallel electric field between the dust collecting plate and the main corona electrode; when the dust-laden flue gas enters the parallel electric field, the dust particles in the flue gas become charged during movement and collision, and gain the first acceleration under the action of the electric field, moving towards the dust collecting plate. Step 2, Auxiliary Electric Field Directional Enhancement: The second negative DC high-voltage power supply is turned on to energize the auxiliary corona electrode, causing it to generate corona discharge and form an auxiliary enhanced electric field with the dust collecting electrode plate. Since the auxiliary electrode wire of the auxiliary corona electrode is wrapped with insulating material on one side facing the center of the channel, the field strength in the direction of the channel center is suppressed and the electric field lines in that direction are weakened, avoiding squeezing interference with the electric field lines of the main corona electrode. At the same time, the electric field lines are concentrated on the side facing the dust collecting electrode plate, which greatly enhances the field strength in the area near the dust collecting electrode plate. Step 3, secondary acceleration and collection of dust particles: When the charged dust particles move to the area near the dust collecting electrode plate, the electric field strength decreases and the movement speed slows down due to the distance from the discharge tip of the main corona electrode. The charged dust particles then enter the auxiliary enhanced electric field. Under the action of the auxiliary enhanced electric field, the charged dust particles receive a second acceleration and are accelerated again towards the dust collecting electrode plate. Finally, they arrive at the dust collecting electrode plate and release their charge, adhering to the surface of the dust collecting electrode plate. The dust-laden flue gas is then purified and discharged from the device.

[0014] Preferably, in step 1, the secondary voltage of the first negative DC high voltage power supply is set to 30~60kV; in step 2, the operating voltage of the second negative DC high voltage power supply is set to 20~40kV.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention constructs a combined electric field of the main corona electrode and auxiliary corona electrodes within a conventional electric field by arranging a main corona electrode at the center of the device and adding auxiliary corona electrodes on both sides and near the dust collection electrode plate. When the main corona electrode is energized, it generates a parallel electric field, while the auxiliary corona electrodes provide an additional enhanced electric field near the dust collection electrode plate. The superposition of the two electric fields provides a better movement path for charged dust particles in the electric field region, effectively avoiding electric field interference from the dual-electrode structure. This invention wraps the auxiliary electrode wire of the auxiliary corona electrode with insulating material on the side facing the center of the channel. The design of wrapping one side with high resistivity insulating material can effectively block the interference electric field generated by the auxiliary electrode wire in the direction of the channel center, weaken the electric field in that direction, avoid mutual interference between the two sets of corona electrodes as much as possible, prevent the compression of the electric field lines of the main and auxiliary electrodes, and make the electric field lines mainly concentrated on the side facing the dust collection plate.

[0016] This invention achieves secondary acceleration of dust particles, significantly improving dust collection capabilities. It not only greatly enhances the electric field strength near the collecting electrode, but also, when charged dust particles slow down as they move toward the electrode due to the attenuation of the main electric field, the auxiliary enhanced electric field can further accelerate the dust particles entering this area, increasing the approach speed of dust particles near the collecting electrode. This effectively prevents uncollected dust particles from being carried away by the airflow again, further improving the working efficiency of the electrostatic precipitator and its ability to deeply purify dust-laden flue gas. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and, together with their descriptions, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1This is an internal structural diagram of the dual corona electrode electrostatic dust removal device provided in an embodiment of the present invention; Figure 2 The auxiliary polarimetric structure and cross-sectional view provided in the embodiments of the present invention; Figure 3 This is a top-view cross-sectional view of the dual corona electrode electrostatic dust removal device provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the electrode arrangement and principle of the dual corona electrode electrostatic dust removal device provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the test process for the dual-corona electrode electrostatic dust removal device provided in an embodiment of the present invention; Figure 6 A comparison chart of the dust removal performance of the dual corona electrode electrostatic dust removal device provided in the embodiments of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0021] This invention provides a dual-corona electrode electrostatic dust removal device 4, such as... Figure 1-4 As shown, it includes a grounded dust collection plate 1, a main corona electrode 2, and an auxiliary corona electrode 3; The dust collecting plate 1 is arranged parallel to the flue gas flow direction and is located on both sides inside the device. The main corona electrode 2 is arranged parallel to the flue gas flow direction and is located in the center of the device, connected to the first negative DC high voltage power supply. The auxiliary corona electrode 3 is arranged parallel to the flue gas flow direction, located on both sides of the main corona electrode 2 and close to the dust collection electrode plate 1, and is connected to the second negative DC high voltage power supply. The auxiliary corona electrode 3 includes an auxiliary electrode wire 3-1, and the side of the auxiliary electrode wire 3-1 facing the center of the channel is wrapped with an insulating material 3-3.

[0022] In this embodiment, the dust collecting plates 1 are plate structures, arranged in two rows parallel to the flue gas flow direction, and located on both sides inside the dual corona electrode electrostatic precipitator 4. They form an electric field with the two sets of corona electrodes to collect dust particles from the flue gas. The dust collecting plates 1 can be made of metal, which has the advantages of simple manufacturing process, good wear resistance, strong practicality, and rapid charge release. The specific principle for material selection is to meet the actual working requirements of the dual corona electrode electrostatic precipitator 4.

[0023] The main corona electrode 2 is composed of a frame tube and conventional corona electrode wires, arranged in a single row parallel to the flue gas flow direction and located at the center of the dual corona electrode electrostatic precipitator 4. It connects to the first negative DC high-voltage power supply, generating a parallel electric field with the dust collecting plate 1 after the high-voltage power supply is energized. The main corona electrode 2 consists of two parts: the frame tube and the corona electrode wires. The frame tube can be made of metal, which offers advantages such as simple manufacturing process, conductivity, and heat dissipation, meeting the technical requirements for long-term stable operation of the corona electrode under working conditions. The conventional corona electrode wires are also made of metal, and the wire type can include commonly used wires such as needle-punched wire, barbed wire, serrated wire, and spiral wire. The specific principle for material selection is to meet the actual working requirements of the dual corona electrode electrostatic precipitator 4.

[0024] The auxiliary corona electrode 3 is composed of a frame tube and auxiliary electrode wires 3-1, arranged in two rows parallel to the flue gas flow direction. It is located on both sides of the main corona electrode 2 inside the dual corona electrode electrostatic precipitator 4, close to the dust collecting plate 1. It is used to connect to the second negative DC high-voltage power supply. After the high-voltage power supply is energized, it forms an auxiliary enhanced electric field near the dust collecting plate 1, further accelerating dust particles entering this area. The auxiliary corona electrode 3 consists of two parts: a frame tube and auxiliary electrode wires 3-1. The frame tube can also be made of metal. The dual-corona electrode electrostatic precipitator 4 has both a main corona electrode 2 and an auxiliary corona electrode 3 installed inside its electric field. The installation method of the two sets of corona electrode wires is as follows: Figure 3 As shown, the side of the auxiliary electrode 3-1 with the insulating material attached should face the center of the channel, and the main corona electrode and the auxiliary electrode 3-1 should be arranged alternately to avoid mutual interference between the two sets of corona electrodes and to prevent the electric field lines of the main electrode and the auxiliary electrode from being squeezed.

[0025] The dual-corona electrode electrostatic precipitator 4 should be equipped with a housing structure, as shown in the reference. Figure 3 As shown, a dust collection plate 1, a main corona electrode 2, and an auxiliary corona electrode 3 are used to install the dual corona electrode structure, and to diffuse the airflow in the flue into the electric field region. The specific principle for material selection is to meet the actual working requirements of the dual corona electrode electrostatic precipitator 4.

[0026] In some embodiments, the auxiliary electrode 3-1 includes a round steel electrode 3-2; the insulating material 3-3 is wrapped on one side of the round steel electrode 3-2 to block the interference electric field generated in the direction of the channel center and to reduce the electric field generated by the auxiliary electrode in that direction.

[0027] Specifically, the auxiliary electrode 3-1 consists of two parts: a round steel electrode 3-2 and an insulating material 3-3. The round steel electrode 3-2 can use round steel of different diameters (Φ3~Φ8) as corona electrodes to generate a uniform auxiliary enhanced electric field. The insulating material 3-3 can use a variety of high resistivity insulating materials to wrap the round steel electrode 3-2 on one side, blocking it from generating an interfering electric field in the direction of the channel center and weakening the electric field lines generated by the auxiliary electrode in that direction.

[0028] In some embodiments, the diameter of the round steel electrode 3-2 is Φ3~Φ8; the insulating material 3-3 is a high resistivity insulating material, selected from materials with a resistivity of... Silicone rubber, resistivity Polytetrafluoroethylene or with a resistivity of Any one of the 95 porcelain types.

[0029] Specifically, the insulating material 3-3 can be silicone rubber (resistivity: 10). 9 ~10 15 Ω·cm), polytetrafluoroethylene (resistivity: 10 14 ~10 19 Ω·cm), 95 ceramic (resistivity: 10 12 ~10 14 High resistivity insulating materials (Ω·cm, etc.) are used. The round steel electrode wire 3-2 and the insulating material 3-3 can be bonded together using a high-strength adhesive. The specific principle for material selection is to meet the actual working requirements of the dual-corona electrode electrostatic precipitator 4.

[0030] In some embodiments, the round steel electrode 3-2 and the insulating material 3-3 are bonded together using a high-strength adhesive.

[0031] Specifically, the auxiliary electrode 3-1 in the auxiliary corona electrode 3 is a special structure composed of a round steel electrode 3-2 and a high-resistivity insulating material 3-3. During actual manufacturing and assembly, considering the complex industrial operating environment inside the electrostatic precipitator (such as the effect of a high-voltage electric field, long-term scouring by dust-laden airflow, and possible temperature fluctuations), a high-strength adhesive is used to firmly bond the insulating material 3-3 to the surface of the round steel electrode 3-2 on one side. This not only ensures a tight fit between the insulating material 3-3 and the electrode, preventing detachment, cracking, or displacement during long-term operation and maintaining the physical stability of the one-sided wrapping structure, but more importantly, it ensures that the insulating layer (such as highly resistive silicone rubber, polytetrafluoroethylene, or 95% ceramic) can continuously and stably form an electrical insulation barrier towards the center of the channel. This precisely blocks the interfering electric field generated by the round steel electrode 3-2 towards the center of the channel, effectively weakening the electric field lines in that direction. This ensures that the auxiliary electric field can directionally enhance the field strength near the electrode plate, achieving efficient secondary acceleration of decelerating dust particles.

[0032] In some embodiments, the corona electrode line of the main corona electrode 2 and the auxiliary electrode line 3-1 of the auxiliary corona electrode 3 are arranged alternately to avoid mutual interference between the two sets of corona electrodes and compression of the electric field lines.

[0033] Specifically, within the electric field of the dual-corona electrode electrostatic precipitator 4, both the main corona electrode 2 and the auxiliary corona electrode 3 are simultaneously installed, and both sets of electrodes generate corona discharge after being energized. To ensure the stability and uniformity of the electric field distribution, the conventional corona electrode wires of the main corona electrode 2 and the auxiliary electrode wires 3-1 of the auxiliary corona electrode 3 are installed in a staggered manner along the flue gas flow direction. Simultaneously, the side of the auxiliary electrode wire 3-1 with the insulating material 3-3 adhered to strictly faces the center of the channel. This staggered arrangement, combined with the single-sided insulation design of the auxiliary electrode, minimizes the mutual repulsion of space charges generated by the two sets of corona electrodes during discharge. It effectively prevents mutual interference such as squeezing or deformation of the electric field lines of the main and auxiliary electrodes, thus ensuring that the initial charging handled by the main electric field and the secondary acceleration handled by the auxiliary electric field can function independently and efficiently.

[0034] In some embodiments, the number of dust collecting plates 1 is set to 2 rows; the number of main corona electrodes 2 is set to 1 row; and the number of auxiliary corona electrodes 3 is set to 2 rows.

[0035] Specifically, in order to construct the optimal combined electric field spatial structure inside the dust removal device, the above-mentioned components are distributed symmetrically in layers. Two rows of dust collecting plates 1 are arranged in parallel on both sides of the inner boundary of the double corona electrode electrostatic dust removal device 4, forming the outer dust collecting surface of the electric field; one row of main corona electrodes 2 is arranged in parallel at the inner center of the device, with equal distances from the dust collecting plates 1 on both sides; two rows of auxiliary corona electrodes 3 are arranged in parallel on both sides of the main corona electrodes 2, and each is close to the corresponding dust collecting plate 1. This not only ensures smooth flue gas flow in the central area of ​​the channel, but more importantly, it constructs a combined electric field of main corona electrodes and auxiliary corona electrodes in the conventional single-channel electric field area, realizing precise control of the graded and zoned electric field force of moving fine particles.

[0036] In some embodiments, the first negative DC high voltage power supply provides a secondary voltage of 30~60kV to the main corona electrode 2 to generate a parallel main electric field; the second negative DC high voltage power supply provides an operating voltage of 20~40kV to the auxiliary corona electrode 3 to generate an auxiliary enhanced electric field near the electrode plate region.

[0037] Specifically, based on actual operating conditions, both the main corona electrode 2 and the auxiliary corona electrode 3 require appropriate operating voltages. The secondary voltage of the main corona electrode 2 is maintained at a relatively high level of 30~60kV. This is because the central area is far from the dust collecting plates 1 on both sides, requiring a higher operating voltage to fully ionize the flue gas over a large area, generating a large number of ions and forming a broad parallel main electric field, thereby giving the dust a strong initial driving velocity. On the other hand, the auxiliary corona electrode 3, being closer to the dust collecting plates 1 in physical space, has a relatively short electrode spacing, allowing it to generate a sufficiently strong auxiliary reinforcing electric field in the near-plate area at a lower operating voltage of 20~40kV. This stepped, differentiated voltage configuration not only avoids frequent breakdown flashovers in the near-plate area due to excessively high voltage, but also allows the effects of the two electric fields to be perfectly superimposed, providing a better movement path for charged dust particles in the electric field area, effectively enhancing the overall dust collection capacity of the dual corona electrode electrostatic precipitator 4.

[0038] The working principle of this invention is as follows: The internal structure of the electric field of the dual-corona electrode electrostatic precipitator 4 includes a grounded dust-collecting plate 1, a main corona electrode 2 connected to a first negative DC high-voltage power supply, and an auxiliary corona electrode 3 connected to a second negative DC high-voltage power supply. The two sets of corona electrodes sequentially form a high-voltage electric field after the high-voltage power supply is energized. During the passage of the dust-laden airflow through the high-voltage electric field within the dual-corona electrode electrostatic precipitator 4: In the first step, due to the corona discharge between the main corona electrode 2 and the dust collecting plate 1, the gas is ionized. At this time, the negatively charged gas ions move towards the dust collecting plate 1 under the action of the electric field force. During the movement of the gas ions, they collide with the dust particles, causing the dust particles to become negatively charged. The charged dust particles also move towards the dust collecting plate 1 under the action of the electric field force. However, during the movement, the electric field strength gradually decreases, causing the charged dust particles to approach at a slower speed.

[0039] In the second step, since the auxiliary corona electrode 3 and the dust collecting electrode 1 both generate corona discharge, and because the auxiliary electrode wires are wrapped with insulating material towards the center of the electric field channel, the field strength in that direction is suppressed to a certain extent, and the electric field lines are weakened. However, towards the dust collecting electrode 1, the field strength in the area near the dust collecting electrode 1 is significantly enhanced. Under the influence of this field strength, the charged dust particles are accelerated again towards the dust collecting electrode 1, increasing the approach speed of the dust particles in this area. After the charged dust reaches the dust collecting electrode, the dust particles release their charge and deposit on the dust collecting electrode 1. The dust-laden gas is then purified by the high-voltage electric field and discharged from the dual corona electrode electrostatic precipitator 4, completing the electrostatic dust removal process.

[0040] This invention also provides a highly efficient dust removal method for the dual-corona electrode electrostatic precipitator 4. The dual-corona electrode electrostatic precipitator 4 is installed in a flue gas duct through which dust-laden airflow enters, and is powered by two negative DC high-voltage power supplies to the main corona electrode and the auxiliary corona electrode. Its electrostatic dust removal efficiency under actual working conditions is tested. A schematic flowchart of the implementation method is shown in the reference. Figure 5 As shown.

[0041] The method includes the following steps: Step 1, primary acceleration of the main electric field: turn on the first negative DC high voltage power supply to energize the main corona electrode 2, forming a parallel electric field between the dust collecting plate 1 and the main corona electrode 2; when the dust-laden flue gas enters the parallel electric field, the dust particles in the flue gas become charged during movement and collision, and gain the first acceleration under the action of the electric field, moving towards the dust collecting plate 1. Specifically, in step 1, the first negative DC high-voltage power supply is turned on to energize the main corona electrode 2. When the secondary voltage of the main corona electrode 2 exceeds a specific corona initiation voltage, the main corona electrode 2 will generate a strong corona discharge phenomenon, causing the gas to ionize and generate a large number of positive ions and free electrons, thereby forming a wide parallel electric field between the grounded dust collecting plate 1 and the main corona electrode 2. When the dust-laden flue gas enters this parallel electric field, the dust particles in the flue gas collide with ions during their movement and become negatively charged. Under the action of the electric field force, the charged dust particles gain their first acceleration and move rapidly towards the dust collecting plate 1. However, when the charged dust moves to the area close to the dust collecting plate, the electric field strength gradually weakens because there is already a certain distance from the discharge tip of the main corona electrode 2. This directly causes the movement speed of the charged dust to slow down, and the speed at which it approaches the plate decreases, making the dust particles a critical state where they are easily carried away by the airflow again.

[0042] Step 2, Auxiliary electric field directional enhancement: Turn on the second negative DC high voltage power supply to energize the auxiliary corona electrode 3, causing it to generate corona discharge and form an auxiliary enhanced electric field with the dust collecting electrode plate 1; Since the auxiliary electrode line 3-1 of the auxiliary corona electrode 3 is wrapped with insulating material 3-3 on one side facing the center of the channel, the field strength in the direction of the channel center is suppressed and the electric field lines in this direction are weakened, avoiding squeezing interference with the electric field lines of the main corona electrode 2; At the same time, the electric field lines are concentrated on the side facing the dust collecting electrode plate 1, which greatly enhances the field strength in the area near the dust collecting electrode plate 1; Specifically, in step 2, to continue the gradually weakening main electric field force, a second negative DC high-voltage power supply is turned on to energize the auxiliary corona electrode 3. When the secondary voltage of the auxiliary corona electrode 3 exceeds a specific corona initiation voltage, the auxiliary corona electrode will also generate corona discharge, forming a new auxiliary enhanced electric field with the dust collecting plate 1 in the near-plate region. The core of this step lies in the directional control of the electric field: since the auxiliary electrode line 3-1 is wrapped with insulating material 3-3 on one side facing the center of the electric field channel, this suppresses the field strength in that direction to a certain extent and effectively weakens the electric field lines. This physical barrier structure avoids mutual interference between the two sets of corona electrodes as much as possible, preventing electric field line squeezing between the main corona electrode 2 and the auxiliary corona electrode 3. Due to the suppression of the discharge in the central direction, the electric field lines are forced to concentrate highly on the side facing the dust collecting plate 1, thereby significantly enhancing the local electric field strength in the region near the dust collecting plate 1.

[0043] Step 3, secondary acceleration and collection of dust particles: When the charged dust particles move to the area near the dust collecting electrode plate, the electric field strength decreases and the movement speed slows down due to the distance from the discharge tip of the main corona electrode 2. The charged dust particles enter the auxiliary enhanced electric field. Under the action of the auxiliary enhanced electric field, the charged dust particles gain a second acceleration and are accelerated again towards the dust collecting electrode plate 1. Finally, they arrive at and release their charge, adhering to the surface of the dust collecting electrode plate 1. The dust-laden flue gas is purified and discharged from the device.

[0044] Specifically, in step 3, the decelerated dust is recaptured. Dust particles in the flue gas that acquire negative charges through motion and collision, when moving near the electrode plate under the influence of the main electric field and experiencing velocity decay, precisely enter the auxiliary enhanced electric field region constructed by the auxiliary corona electrode. Under the strong directional local electric field strength in this region, the auxiliary electric field provides secondary acceleration, giving the charged dust particles a second acceleration. This relay of power enables the charged dust to overcome airflow interference and be accelerated again towards the dust collecting electrode 1. Finally, the charged dust particles, after secondary acceleration, successfully reach the dust collecting electrode 1 and release their charge, firmly adhering to and depositing on the surface of the dust collecting electrode. As the number of captured dust particles decreases, the dust-laden gas is deeply purified by the high-voltage electric field and then discharged from the dual corona electrode electrostatic precipitator 4, efficiently completing the entire electrostatic dust removal process.

[0045] Furthermore, in step 1, the secondary voltage of the first negative DC high voltage power supply is set to 30~60kV; in step 2, the operating voltage of the second negative DC high voltage power supply is set to 20~40kV.

[0046] Specifically, based on actual operating conditions, both the main corona electrode 2 and the auxiliary corona electrode 3 require appropriately set operating voltages. In step 1, the secondary voltage provided by the first negative DC high-voltage power supply to the main corona electrode 2 is set to 30~60kV, primarily used to generate a sufficiently strong main parallel electric field in the central region of a relatively wide channel, ensuring that the dust-laden flue gas entering the electric field can be fully ionized, thereby giving the dust particles a strong initial driving velocity. In step 2, the operating voltage provided by the second negative DC high-voltage power supply to the auxiliary corona electrode 3 is set to 20~40kV. Since the auxiliary corona electrode 3 is physically closer to the dust collecting plate 1, its shorter electrode spacing allows it to generate an effective and directional auxiliary enhanced electric field near the plate region at a relatively low voltage. This differentiated high-voltage power supply strategy allows the two sets of electric fields to complement each other, preventing electric field breakdown in the near-plate region due to excessive voltage, and achieving precise secondary acceleration of decelerating dust, thus effectively improving the overall dust collection capacity of the dual-corona electrode electrostatic precipitator 4.

[0047] Based on the above implementation method of the dual corona electrode electrostatic precipitator, the difference in dust removal performance between the conventional single corona electrode structure and the dual corona electrode structure was verified under simulated actual working conditions.

[0048] Test Condition 1: A dust-collecting electrode 1 and a main corona electrode 2 are installed in the dual-corona electrode electrostatic precipitator 4. The main corona electrode 2 is arranged parallel to the flue gas flow direction and located at the center of the dual-corona electrode electrostatic precipitator 4. The main corona electrode 2 is energized by a first negative DC high-voltage power supply, with the operating voltage set to 55kV-65kV. After the operating voltage stabilizes, a fixed volume and concentration of dust-laden airflow is introduced into the front-end flue gas duct. The electrostatic collection capability of the conventional corona electrode structure for the dust-laden airflow is tested, and the result is verified by the dust concentration at the outlet gas.

[0049] Test Condition 2: A dust-collecting electrode 1, a main corona electrode 2, and an auxiliary corona electrode 3 are installed inside a dual-corona electrode electrostatic precipitator 4. The main corona electrode 2 is arranged parallel to the flue gas flow direction and located at the center of the dual-corona electrode electrostatic precipitator 4. The main corona electrode 2 is energized by a first negative DC high-voltage power supply, with an operating voltage set to 55kV~65kV. The auxiliary corona electrode 3 is arranged parallel to the flue gas flow direction, located on both sides of the main corona electrode 2 inside the dual-corona electrode electrostatic precipitator 4, close to the dust-collecting electrode 1. The auxiliary corona electrode 3 is energized by a second negative DC high-voltage power supply, with an operating voltage set to 35kV~45kV. After the operating voltage stabilizes, a fixed volume and concentration of dust-laden airflow is introduced into the front-end flue gas duct to test the electrostatic capture capability of the conventional corona electrode structure for the dust-laden airflow. The verification is based on the dust concentration at the outlet gas.

[0050] like Figure 6 As shown, under the two test conditions described above, the dust concentration at the flue gas outlet was measured. Each test group consisted of the average of five parallel tests: the outlet dust concentration under test condition 1 was 126.67 mg / Nm³. 3 The outlet dust concentration under test condition 2 was 93.94 mg / Nm³. 3 Therefore, it can be concluded that the working efficiency and dust removal performance of the electrostatic precipitator using a double corona electrode structure are superior to those of the conventional corona electrode structure.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A dual-corona electrode electrostatic dust removal device, characterized in that, This includes a grounded dust collection electrode, a main corona electrode, and an auxiliary corona electrode; The dust collecting plates are arranged parallel to the flue gas flow direction and are located on both sides inside the device. The main corona electrode is arranged parallel to the flue gas flow direction and is located in the center of the device, connected to the first negative DC high voltage power supply. The auxiliary corona electrode is arranged parallel to the flue gas flow direction, located on both sides of the main corona electrode and close to the dust collection electrode plate, and is connected to the second negative DC high voltage power supply. The auxiliary corona electrode includes an auxiliary electrode wire, and the side of the auxiliary electrode wire facing the center of the channel is wrapped with insulating material.

2. The dual-corona electrode electrostatic precipitator according to claim 1, characterized in that, The auxiliary electrode includes a round steel electrode; the insulating material is wrapped on one side of the round steel electrode to block the interference electric field generated in the direction of the channel center and to weaken the electric field generated by the auxiliary electrode in that direction.

3. The dual-corona electrode electrostatic dust collector according to claim 2, characterized in that, The diameter of the round steel electrode wire is Φ3~Φ8; the insulating material is a high resistivity insulating material, selected from materials with a resistivity of... Silicone rubber, resistivity Polytetrafluoroethylene or with a resistivity of Any one of the 95 porcelain types.

4. The dual-corona electrode electrostatic dust collector according to claim 2 or 3, characterized in that, The round steel electrode wire and insulating material are bonded together using a high-strength adhesive.

5. The dual-corona electrode electrostatic precipitator according to claim 1, characterized in that, The corona electrode wires of the main corona electrode and the auxiliary electrode wires of the auxiliary corona electrode are arranged in an alternating manner to avoid mutual interference between the two sets of corona electrodes and the squeezing of the electric field lines.

6. The dual-corona electrode electrostatic precipitator according to claim 1, characterized in that, The number of dust collecting plates is set to 2 rows; the number of main corona electrodes is set to 1 row; and the number of auxiliary corona electrodes is set to 2 rows.

7. The dual-corona electrode electrostatic precipitator according to claim 1, characterized in that, The first negative DC high voltage power supply provides a secondary voltage of 30~60kV to the main corona electrode, which is used to generate a parallel main electric field; the second negative DC high voltage power supply provides an operating voltage of 20~40kV to the auxiliary corona electrode, which is used to generate an auxiliary enhanced electric field near the electrode plate region.

8. A highly efficient dust removal method based on the dual corona electrode electrostatic precipitator according to any one of claims 1-7, characterized in that, The method includes the following steps: Step 1, primary acceleration of the main electric field: Turn on the first negative DC high voltage power supply to energize the main corona electrode, forming a parallel electric field between the dust collecting plate and the main corona electrode; when the dust-laden flue gas enters the parallel electric field, the dust particles in the flue gas become charged during movement and collision, and gain the first acceleration under the action of the electric field, moving towards the dust collecting plate. Step 2, Auxiliary Electric Field Directional Enhancement: The second negative DC high-voltage power supply is turned on to energize the auxiliary corona electrode, causing it to generate corona discharge and form an auxiliary enhanced electric field with the dust collecting electrode plate. Since the auxiliary electrode wire of the auxiliary corona electrode is wrapped with insulating material on one side facing the center of the channel, the field strength in the direction of the channel center is suppressed and the electric field lines in that direction are weakened, avoiding squeezing interference with the electric field lines of the main corona electrode. At the same time, the electric field lines are concentrated on the side facing the dust collecting electrode plate, which greatly enhances the field strength in the area near the dust collecting electrode plate. Step 3, secondary acceleration and collection of dust particles: When the charged dust particles move to the area near the dust collecting electrode plate, the electric field strength decreases and the movement speed slows down due to the distance from the discharge tip of the main corona electrode. The charged dust particles then enter the auxiliary enhanced electric field. Under the action of the auxiliary enhanced electric field, the charged dust particles receive a second acceleration and are accelerated again towards the dust collecting electrode plate. Finally, they arrive at the dust collecting electrode plate and release their charge, adhering to the surface of the dust collecting electrode plate. The dust-laden flue gas is then purified and discharged from the device.

9. The high-efficiency dust removal method according to claim 8, characterized in that, In step 1, the secondary voltage of the first negative DC high voltage power supply is set to 30~60kV; in step 2, the operating voltage of the second negative DC high voltage power supply is set to 20~40kV.

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