An electrostatic precipitator

Abstract

The present application relates to an electrostatic precipitator, comprising a drive unit, an air inlet, an air outlet, an ash hopper, a housing, and a partition disposed within the housing; the partition is capable of separating the inner cavity of the housing into a first cavity and a second cavity, each of which is independently provided with a dust removal unit, comprising a dust collecting electrode plate and a discharge electrode; an air inlet and an air outlet are disposed at the top of the housing, the air inlet being able to communicate with each cavity through the air inlet, and the air outlet being able to communicate with each cavity through the air outlet; an ash discharge port is disposed at the bottom of the housing, and the ash hopper is able to communicate with each cavity through the ash discharge port; the drive unit is configured to drive the partition to operate within the housing to change the size of the first cavity and the second cavity. The electrostatic precipitator can effectively improve the dust removal efficiency of the electrostatic precipitator and reduce the dust concentration of the flue gas at the outlet.

Description

Technical Field

[0001] The present application relates to the technical field of dust removal equipment, and in particular to an electrostatic precipitator. Background Art

[0002] The negatively charged discharge electrode in the electrostatic precipitator ionizes and discharges the flue gas, causing positive ions, negative ions and neutral ions to be ionized in the flue gas. Since the discharge electrode is usually negatively charged, the flue gas is negatively charged. Most of the dust in the flue gas combines with the negative ions to become negatively charged. Due to the principle of opposites attract, it will be attracted by the grounded dust collecting plate installed on the periphery. A small part of the dust combines with the positive ions to become positively charged. Due to the principle of opposites attract, it will be attracted to the negatively charged discharge electrode. By vibrating the dust collecting plate and the discharge electrode, the dust falls into the ash hopper for storage.

[0003] Since the flue gas of the existing electrostatic precipitator continuously enters the dust collector, the dust collector occupies a limited area, that is, the length of the discharge electrode and the anode plate is also limited. The dust in the flue gas can only pass through the channel formed by the discharge electrode and the anode plate once. The dust collection capacity of the electrostatic precipitator is limited. That is, when the dust concentration at the inlet of the dust collector changes, the dust concentration at the outlet of the dust collector will also change. For example, if the inlet dust concentration doubles, the outlet dust concentration may also double, and the outlet dust concentration cannot be effectively guaranteed.

[0004] Therefore, how to improve the dust removal efficiency of the electrostatic precipitator and reduce the dust concentration of the outlet flue gas is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide an electrostatic precipitator that can effectively improve the dust removal efficiency of the electrostatic precipitator and reduce the dust concentration of the outlet flue gas.

[0006] In order to solve the above technical problems, the present application provides an electrostatic precipitator, comprising a driving part, an air inlet, an air outlet, an ash hopper, a shell and a partition arranged in the shell; the partition can separate the inner cavity of the shell into a first cavity and a second cavity that are independent of each other, and each cavity is respectively provided with a dust removal part, and the dust removal part includes a dust collecting electrode and a discharge electrode; the top of the shell is provided with an air inlet and an air outlet, the air inlet can be communicated with each cavity respectively through the air inlet, and the air outlet can be communicated with each cavity respectively through the air outlet, and the bottom of the shell is provided with an ash discharge port, and the ash hopper can be communicated with each cavity respectively through the ash discharge port; the driving part is used to drive the partition to move in the shell to change the size of the first cavity and the second cavity.

[0007] Dust-laden flue gas can enter each cavity part through the air intake part and the air inlet. When the partition moves toward one side of the first cavity part, the space of the first cavity part is squeezed, a high-pressure environment is formed inside, and the dust concentration of the flue gas increases. At the same time, the space of the second cavity part is enlarged. When the driving part stops, the air intake part only passes flue gas into the second cavity part through the air inlet, and opens the dust removal part in the first cavity part, while the dust removal part in the second cavity part remains closed, so that the flue gas in the first cavity part is dust-removed by the dust removal part, and the second cavity part does not perform dust removal operation and continues to maintain the air intake state, that is, dust is removed in the first cavity part, and a large amount of flue gas is stored in the second cavity part.

[0008] When the dust removal in the first cavity is completed, the dust removal part in the first cavity is closed, and the clean flue gas in the first cavity is discharged from the air outlet, and then the partition moves to one side of the second cavity under the action of the driving part. At this time, the space in the second cavity is gradually squeezed to form a high-pressure environment, and the dust concentration of the flue gas increases. When the driving part stops, the air intake part only introduces flue gas into the first cavity through the air intake, and opens the dust removal part in the second cavity. The dust removal part in the first cavity remains closed, so that the flue gas in the second cavity is dust-removed through the dust removal part, while the first cavity continues to maintain an air intake state, that is, the second cavity is dust-removed, and the first cavity stores a large amount of flue gas.

[0009] In other words, the action of the partition changes the size of the first and second cavities, compressing the space within one cavity and increasing the dust concentration in the flue gas. This facilitates the dust removal operation of the dust removal unit, and as the dust concentration in the flue gas increases, the dust removal effect improves. Furthermore, the air inlet of the cavity in the dust removal state stops intake, allowing the internal dust removal to proceed in a static state. Falling dust particles will not be carried up by the rising flue gas, and at the same time, the dust particles will be captured by the dust collecting plates, resulting in high cleaning efficiency and less risk of secondary dust.

[0010] Furthermore, the dust removal after the flue gas is compressed can reduce the overall volume of the electrostatic precipitator while achieving the same flue gas processing capacity, reduce the requirements for site space, and has good applicability.

[0011] Optionally, the shell has a cylindrical structure, the driving part includes a motor and a transmission shaft, the partition is connected to the transmission shaft, and can rotate around the transmission shaft under the driving action of the motor, and the side wall of the partition is sealed and fitted with the inner wall of the shell.

[0012] Optionally, the air inlet portion includes an air inlet duct and an annular flue, the air inlet duct is connected to the inlet of the annular flue, and the air inlets are arranged below the annular flue; the air outlet portion is arranged at the center of the annular flue.

[0013] Optionally, the air inlets are arranged at intervals along the circumference of the annular flue; and the partition can be rotated until the air inlets are simultaneously connected to the first cavity portion, or simultaneously connected to the second cavity portion.

[0014] Optionally, the air inlet is in a fan-shaped structure, and the center of the fan-shaped structure is arranged on one side facing the center of the shell.

[0015] Optionally, the number of the first cavity and the number of the second cavity are both two, and the two first cavity are symmetrically arranged about the center of the shell, and the two second cavity are symmetrically arranged about the center of the shell; the partition includes two cross-arranged plates, and the intersection of the two plates is located at the transmission shaft. The rotation of the transmission shaft can drive the two plates to rotate, and the rotation directions of the two plates are opposite.

[0016] Optionally, the air intake duct is further provided with a compressor.

[0017] Optionally, a sealing plate for sealing the inner cavity is further provided at the bottom of the shell, and the sealing plate is provided with each ash discharge port; the edge of the ash discharge port corresponds to the edge of the dust removal part and is located below the dust removal part, and the ash hopper includes sub-areas that are connected to each of the cavity parts one by one, and each sub-area is independent of each other.

[0018] Optionally, the dust collecting plates of the dust removal section are arranged in a V-shaped structure or a fan-shaped structure.

[0019] Optionally, it further includes a rapping device arranged on the top of the shell, the rapping device is connected to the discharge electrode and the dust collecting electrode of the dust removal part, and is used to provide a rapping force.

[0020] Optionally, a dust concentration detector is provided in each cavity.

[0021] Optionally, the gas outlet portion further includes a buffer tank connected to each of the gas outlets. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the electrostatic precipitator provided in the embodiment of the present application;

[0023] Figure 2 yes Figure 1 Middle AA section view;

[0024] Figure 3 yes Figure 1 Middle BB cross-section;

[0025] Figure 4 It is a schematic diagram showing that the first chamber is in a compression dust removal state and the second chamber is in a flue gas storage state;

[0026] Figure 5 It is a schematic diagram showing that the first chamber is in a flue gas storage state and the second chamber is in a compression dust removal state;

[0027] Figure 6 yes Figure 1 Cross-sectional view of CC;

[0028] Figure 7 It is a structural diagram of the sealing plate.

[0029] Attachment Figure 1-Figure 7 In the figure, the reference numerals are described as follows:

[0030] 1- driving part, 11- motor, 12- transmission shaft;

[0031] 2-air intake, 21-air intake duct, 22-annular flue, 23-compressor;

[0032] 3-gas outlet, 31-buffer tank;

[0033] 4-ash hopper, 41-sub-area, 42-isolation plate;

[0034] 5-housing, 51-first cavity, 52-second cavity, 53-air inlet, 54-air outlet;

[0035] 6-partition;

[0036] 71-dust collecting plate, 72-discharge electrode, 73-transformer;

[0037] 8-sealing plate, 81-ash discharge port;

[0038] 9-rapping device;

[0039] 10-Dust concentration detector. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Electrostatic precipitators (ESPs) are commonly used dust removal equipment in power plants, offering low maintenance, low operating resistance, and low cost. However, due to the continuous flow of flue gas into existing ESPs, the ESP's footprint is limited, meaning the length of the discharge and collecting plates is also limited. Dust in the flue gas can only pass through the channel formed by these plates once, limiting the ESP's dust collection capacity. This means that any change in the dust concentration at the ESP's inlet will also affect the dust concentration at the ESP's outlet. For example, if the inlet dust concentration doubles, the outlet dust concentration will likely double as well, making it impossible to effectively maintain the outlet dust concentration.

[0042] Therefore, this embodiment provides an electrostatic precipitator, which can improve the dust removal efficiency of the electrostatic precipitator and reduce the dust concentration of the outlet flue gas.

[0043] Specifically, such as Figure 1 As shown, the electrostatic precipitator includes a driving part 1, an air inlet part 2, an air outlet part 3, an ash hopper 4, a shell 5 and a partition 6, wherein the partition 6 can separate the inner cavity of the shell 5 into a first cavity part 51 and a second cavity part 52, the first cavity part 51 and the second cavity part 52 are independently arranged, and a dust removal part 7 is respectively provided in each cavity part. The partition 6 can move in the shell 5 under the driving action of the driving part 1, and as the partition 6 moves, the size of the internal space of the first cavity part 51 and the second cavity part 52 will be changed.

[0044] The top of the housing 5 is provided with an air inlet 53 and an air outlet 54. The air inlet 2 can communicate with each of the first cavity 51 and the second cavity 52 through the air inlet 53, and the air outlet 3 can communicate with each of the first cavity 51 and the second cavity 52 through the air outlet 54. The bottom of the housing 5 is provided with an ash discharge port 81. The ash hopper 4 can communicate with each of the first cavity 51 and the second cavity 52 through the ash discharge port 81.

[0045] A dust removal section 7 is provided in the shell 5, and the dust removal section 7 includes a dust collecting electrode 71 and a discharge electrode 72. The dust-laden flue gas enters the shell 5 from the air inlet 2, and after being dust-removed by the dust removal section 7, is discharged from the air outlet 3, and the dust particles in the shell 5 will fall into the ash hopper 4 and be discharged outside the shell 5.

[0046] The negatively charged discharge electrode 72 in the dust removal section 7 ionizes and discharges the flue gas, ionizing positive ions, negative ions and neutral ions in the flue gas. Since the discharge electrode 72 is usually negatively charged, the flue gas is negatively charged. Most of the dust in the flue gas combines with the negative ions to become negatively charged. Due to the principle of opposites attract, it will be attracted by the grounded dust collecting plate 71 arranged on the periphery. A small part of the dust combines with the positive ions to become positively charged. Due to the principle of opposites attract, it will be attracted to the negatively charged discharge electrode 72, thereby achieving dust removal.

[0047] Dust-laden flue gas can enter each cavity part through the air intake part 2 and the air inlet 53. When the partition 6 moves toward one side of the first cavity part 51, the space of the first cavity part 51 is squeezed, a high-pressure environment is formed inside, and the dust concentration of the flue gas increases. At the same time, the space of the second cavity part 52 is enlarged. When the driving part 1 stops, the air intake part 2 only passes flue gas into the second cavity part 52 through the air inlet 53, and opens the dust removal part 7 located in the first cavity part 51, and the dust removal part 7 in the second cavity part 52 remains closed, so that the flue gas in the first cavity part 51 is dust-removed by the dust removal part 7, and the second cavity part 52 is not dust-removed and continues to maintain the air intake state, that is, dust is removed in the first cavity part 51, and a large amount of flue gas is stored in the second cavity part 52.

[0048] When the dust removal in the first cavity 51 is completed, the dust removal part in the first cavity 51 is closed, and the clean flue gas in the first cavity 51 is discharged from the air outlet 54, and then the partition 6 moves to one side of the second cavity 52 under the action of the driving part 1. At this time, the space in the second cavity 52 is gradually squeezed to form a high-pressure environment, and the dust concentration of the flue gas increases. When the driving part 1 stops, the air intake part 2 only introduces flue gas into the first cavity 51 through the air intake 53, and opens the dust removal part 7 located in the second cavity 52. ​​The dust removal part 7 in the first cavity 51 remains closed, so that the flue gas in the second cavity 52 is dust-removed through the dust removal part 7, while the first cavity 51 continues to maintain the air intake state, that is, the second cavity 52 is dust-removed, and the first cavity 51 stores a large amount of flue gas.

[0049] In other words, the action of the partition 6 changes the size of the first cavity 51 and the second cavity 52, compressing the space within one cavity and increasing the dust concentration in the flue gas. This facilitates the dust removal operation of the dust removal unit 7. As the dust concentration in the flue gas increases, the dust removal effect becomes better. Furthermore, the air inlet 53 of the cavity in the dust removal state stops intake, allowing the internal dust removal to proceed in a static state. Falling dust particles are not carried up by the rising flue gas, and are simultaneously captured by the dust collecting plate 71. This results in high cleaning efficiency and reduces the risk of secondary dust.

[0050] Furthermore, the dust removal after the flue gas is compressed can reduce the overall volume of the electrostatic precipitator while achieving the same flue gas processing capacity, reduce the requirements for site space, and has good applicability.

[0051] like Figure 1 and Figure 2 As shown, the shell 5 has a cylindrical structure, and the driving part 1 includes a motor 11 and a transmission shaft 12, wherein the partition 6 is connected to the transmission shaft 12 and can rotate around the transmission shaft 12 under the driving action of the motor 11. The side wall of the partition 6 is sealed and fitted with the inner wall of the shell 5, and the motor 11 is arranged at the bottom of the shell 5. That is to say, in this embodiment, the partition 6 is rotated to adjust the cavity space. Of course, the driving part 1 can also be set to a cylinder, hydraulic cylinder, etc. to drive the partition 6 to move in a straight line to adjust the space of each cavity. When the partition 6 rotates around the transmission shaft 12 to change the space of each cavity, the overall structure can be simplified and it is easy to achieve the seal between the partition 6 and the inner wall of the shell 5.

[0052] like Figure 1 and Figure 2As shown, the air inlet 2 includes an air inlet duct 21 and an annular flue 22, wherein the air inlet duct 21 is connected to the entrance of the annular flue 22, and air inlets 53 are provided below the annular flue 22, and the annular flue 22 can be connected to the cavity through the air inlet 53. The air outlet 3 is located at the center of the annular flue 22. That is to say, the air inlet duct 21 includes an annular structure located at the periphery, and the air outlet 3 is located at the center of the annular flue 22. Of course, the air outlet 3 can also be set to include an annular structure located at the periphery, and the air inlet 2 can be set at the center of the annular structure. When the air inlet 2 is set to include the annular flue 22, the air inlet duct 21 is connected to the external flue gas. In this way, the arrangement of the air inlet 2 and the air outlet 3 can be facilitated, the external flue gas can be connected to the air inlet duct 21, and the overall structure can be simplified.

[0053] like Figure 2-Figure 5 As shown, each air inlet 53 is arranged at circumferential intervals along the annular flue 22, and the partition 6 can be rotated until each air inlet 53 is connected to the first cavity 51 at the same time. At this time, the first cavity 51 takes in air, the second cavity 52 is in a compression state, and dust removal is performed. The partition 6 can be rotated until each air inlet 53 is connected to the second cavity 52 at the same time. At this time, the second cavity 52 takes in air, the first cavity 51 is in a compression state, and dust removal is performed.

[0054] Alternatively, each air inlet 53 may be provided with a valve, and by opening and closing the valve, the cavity in the compression dust removal state no longer takes in air, while the other group of cavities still maintains the intake state to achieve flue gas storage. The air inlets 53 are arranged along the circumference of the annular flue 22, and the partition 6 rotates and passes through the location of the air inlet 53, so that each air inlet 53 is simultaneously connected to a group of cavities (the first cavity 51 or the second cavity 52). There is no need to provide a valve at the air inlet 53, thereby simplifying the overall structure and reducing costs. Moreover, when each air inlet 53 is simultaneously connected to a group of cavities, the intake speed of the cavity in the intake state can be increased, which is beneficial to flue gas storage, thereby improving dust removal efficiency.

[0055] like Figure 2-Figure 5 As shown, each air inlet 53 is a fan-shaped structure, and the center of the fan-shaped structure is set on one side toward the center of the shell 5. Of course, the air inlet 53 can also be set as a circular hole structure. When it is set as a fan-shaped structure, it can be rotated through the partition 6 to achieve that each air inlet 53 is connected to a group of cavities at the same time, while increasing the area of ​​the air inlet 53, thereby increasing the air intake speed and improving the dust removal efficiency.

[0056] Each cavity is connected to an air outlet 54 , and each air outlet 54 is provided with a control valve for controlling the opening and closing of the air outlet 54 .

[0057] like Figure 2-Figure 5As shown, the number of the first cavity 51 and the second cavity 52 are both two, and the two first cavities 51 are arranged symmetrically about the center of the shell 5, and the two second cavities 52 are arranged symmetrically about the center of the shell 5. That is to say, the first cavity 51 and the second cavity 52 are staggered in sequence along the circumferential direction. The partition 6 includes two plates, which are arranged crosswise, and the intersection of the two plates is located at the transmission shaft 12. The transmission shaft 12 can drive the two plates to rotate, and the rotation directions of the two plates are opposite. Alternatively, the partition 6 can also be set to a structure including only one plate. At the same time, a fixed plate is also provided in the shell 5. The fixed plate is fixed in the shell 5. The plate and the fixed plate are arranged crosswise, and the intersection is located at the transmission shaft 12. The fixed plate does not rotate. The plate rotates around the transmission shaft 12 to achieve changes in the space in the cavity. When the change in the space in the cavity is achieved by rotating the two plates, the speed of compression of the space in the cavity can be increased, thereby improving the flue gas treatment efficiency.

[0058] Specifically, in this embodiment, there is no specific restriction on how to simultaneously drive the two plates to rotate in different directions through the transmission shaft 12. For example, one plate is connected to the transmission shaft 12 for transmission, and the other plate is connected to the transmission shaft 12 through a gear assembly to achieve steering. For those skilled in the art, simultaneously driving the two plates to rotate in different directions through the transmission shaft 12 is already a well-known existing technology and will not be elaborated here to save space.

[0059] like Figure 1-Figure 5 As shown, the air inlet duct 21 is also provided with a compressor 23, which can perform preliminary compression on the flue gas entering the air inlet duct 21. The flue gas after preliminary compression can continue to enter the cavity along the air inlet 53 and be further compressed through the partition 6, which can concentrate the flue gas volume to more than one twentieth of the original volume, and increase the dust concentration in the flue gas by more than twenty times. The dust removal effect of flue gas with high dust concentration is better than that of flue gas with low dust concentration.

[0060] like Figure 1 and Figure 7 As shown, the bottom of the shell 5 is further provided with a sealing plate 8, which can seal the inner cavity from the bottom, and the sealing plate 8 is provided with the above-mentioned ash discharge port 81, the edge of which corresponds to the edge of the dust removal part 7, specifically, the projections of the ash discharge port 81 and the dust removal part 7 on the horizontal plane overlap or mostly overlap, as shown in FIG. Figure 6 As shown, the ash hopper 4 includes sub-areas 41 that communicate with each chamber in a one-to-one correspondence, and each sub-area 41 is independent of the others. For example, if there are two first chambers 51 and two second chambers 52, there are four dust removal sections 7, and the sealing plate 8 has four corresponding ash discharge ports 81. The ash hopper 4 accordingly includes four sub-areas 41, and the dust removal sections 7, ash discharge ports 81, and sub-areas 41 are arranged in a one-to-one correspondence.

[0061] Specifically, the cylindrical body and the sealing plate 8 may be an integrally formed structure, or may be mutually independent and sealed and fixed structures.

[0062] That is to say, the ash discharge of each first cavity 51 and the second cavity 52 is also carried out separately and independently, and complements and interferes with each other. Such an arrangement can avoid the situation where the cavities are connected and flowed through the bottom ash hopper 4 and the ash discharge port 81, which interferes with the internal dust removal.

[0063] Furthermore, since the edge of the ash discharge port 81 corresponds to the edge of the dust removal section 7, the dust can fall into the sub-area 41 of the ash hopper 4 while ensuring the sealed environment of the cavity, which is conducive to the compression of the flue gas in the cavity.

[0064] Each sub-region 41 can be a separate structure or can be a Figure 6 As shown, the ash hopper 4 is provided as a whole, and an isolation plate 42 is provided in the ash hopper 4 so that the inner cavity of the ash hopper 4 is divided into mutually independent sub-areas 41 .

[0065] Of course, in this embodiment, the ash hopper 4 can also be set as one, and a switch valve can be set at each ash discharge port 81, so that the switch valve of the ash discharge port 81 of the cavity in the ash discharge state is opened, and the switch valve of the ash discharge port 81 of the cavity in the air intake state is closed. When the ash hopper 4 is set to include sub-areas 41 corresponding to each cavity, the overall structure can be simplified and the cost can be reduced.

[0066] The dust collecting electrode plates 71 of the dust removal section 7 are arranged in a V-shaped structure or a fan-shaped structure, such as Figure 2-Figure 5 As shown, there are multiple dust collecting plates 71, and a discharge electrode 72 is provided between two adjacent dust collecting plates 71. Each dust removal section 7 also has a central symmetry plane. The dust collecting plates 71 of the dust removal section 7 are symmetrically arranged about the central symmetry plane. The transmission shaft 12 is located on the central symmetry plane, and the dust collecting plates 71 located on the same side of the central symmetry plane are arranged in parallel and evenly spaced, and the discharge electrode 72 is evenly arranged between two adjacent dust collecting plates 71. This arrangement allows each dust collecting plate 71 to be arranged close to one end of the center of the shell 5. Compared with the solution of arranging all the dust collecting plates 71 in parallel, the dust collecting area of ​​the dust collecting plates 71 can be increased, thereby improving the dust removal efficiency. Accordingly, the projection of the ash discharge port 81 on the horizontal plane also forms a V-shaped structure or a fan-shaped structure.

[0067] The top side wall of the partition 6 and the top wall of the shell 5, the bottom side wall of the partition 6 and the sealing plate 8, and the side wall of the partition 6 and the inner wall of the cylindrical shell can all be connected by a high-temperature resistant rubber sealing layer to ensure a sealed environment when compressing the flue gas.

[0068] The dust removal unit 7 further includes a transformer 73 , which is disposed on the top of the dust collector housing 5 and is used to provide a high voltage power supply to the discharge electrode 72 .

[0069] like Figure 1 As shown, a rapping device 9 is also provided on the top of the housing 5. The rapping device 9 is connected to the discharge electrode 72 and the dust collecting plate 71 of the dust removal section 7 to provide a rapping force so that the dust accumulated on the discharge electrode 72 and the dust collecting plate 71 can fall off into the ash hopper 4. Each cavity is provided with a dust removal section 7, and each dust removal section 7 is provided with at least one rapping device 9. By rapping the dust collecting plate 71 and the discharge electrode 72, the dust falls into the ash hopper 4 for storage. In this embodiment, in the cavity portion in the dust removal state, the cavity portion and the corresponding sub-area 41 form a closed cavity, and no smoke is introduced or discharged. After the dust collecting plate 71 and the discharge electrode 72 are started and dust removal is achieved in the transformer 73, the transformer 73 stops, and then the ash is vibrated and cleaned by the vibrating device 9. At this time, since there is no airflow and no discharge electrode 72 working, the falling dust will not be affected by the electric field force and airflow, and can naturally settle to the ash hopper 4, especially for the fine particles PM2.5, which are small and easy to raise dust, and can solve the problem of low fine particle capture effect of existing electrostatic precipitators.

[0070] In this embodiment, each cavity is also provided with a dust concentration detector 10 for detecting the dust concentration in the cavity. When the dust concentration in the cavity reaches a preset concentration (such as 20 mg / m 3 ), the transformer 73 can be turned off, the dust removal operation can be stopped, and after the vibration and dust cleaning is completed, the clean flue gas can be discharged from the outlet 54 and the outlet part 3.

[0071] like Figure 1 As shown, the air outlet 3 also includes a buffer tank 31 connected to each air outlet 54. Since the flue gas in the dust removal chamber is in a compressed state, after the dust removal is completed, the clean flue gas is first buffered by the buffer tank 31 when it is discharged to evenly distribute the airflow and prevent the high-speed airflow from affecting the back-end normal pressure equipment. After the flue gas is discharged through the buffer tank 31, the flue gas increases by more than 20 times its original size. At this time, the dust in the flue gas can reach 1mg / m 3 , far higher than the national standard of 10mg / m 3 requirements and can achieve ultra-clean emissions.

[0072] After the rapping and dust cleaning is completed by the rapping device 9, the rapping device 9 can be closed, and the transformer 73 can be opened. The flue gas in the cavity portion can be dusted again by the dust removal unit 7. After the dust removal is completed, the transformer 73 can be closed, and the rapping device 9 can be used to rap and clean the flue gas. That is to say, after the partition 6 stops moving, the flue gas in the closed cavity formed is in a compressed state. The dust removal unit 7 and the rapping device 9 can be alternately opened and closed to perform multiple dust removal operations on the flue gas in the closed cavity until the dust concentration of the flue gas in the closed cavity reaches a preset concentration, and the flue gas can be discharged through the exhaust port. Such an arrangement ensures the dust removal efficiency while preventing external flue gas from interfering with the flue gas in the closed cavity.

[0073] The number of the first cavity 51 and the second cavity 52 is two, and the partition 6 includes two cross-arranged plates, and forms four plates arranged in sequence in the circumferential direction of the transmission shaft 12: plate a, plate b, plate c, plate d. The inner cavity of the housing 5 is divided into four cavities by these four plates, such as Figure 2-Figure 4 As shown, there are four air inlets 53, which are evenly spaced along the circumference of the annular flue 22. The dust removal parts 7 in the four cavities are evenly spaced along the circumference of the shell 5, and the dust removal parts 7 and the air inlets 53 are staggered. Four rapping devices 9 and four dust removal parts 7 are correspondingly provided.

[0074] like Figure 3-Figure 5 As shown, plate a is located between 0°-90°, plate b is located between 9°-180°, plate c is located between 180°-270°, and plate d is located between 270°-360°. The cavity between plate a and plate b and the cavity between plate c and plate d are both first cavity portions 51, and the cavity between plate b and plate c and the cavity between plate a and plate d are second cavity portions 52. The four air inlets 53 are arranged in four directions of approximately 45°, 135°, 225°, and 315°, respectively. The four dust removal sections 7 are arranged in four directions of 0°, 90°, 180°, and 270°, respectively. The four rapping devices 9 are arranged in four directions of 0°, 90°, 180°, and 270°, respectively.

[0075] like Figure 3 As shown by the arrow in the figure, the motor 11 drives the transmission shaft 12 to rotate and drives the partition 6 to rotate, so that the plates a and b are close to each other, and the plates c and d are close to each other, the first cavity 51 is squeezed, and the space of the second cavity 52 is enlarged. When the partition 6 rotates to the preset position, as shown in FIG. Figure 4 As shown, the first cavity 51 no longer has an air inlet 53, and the second cavity 52 has two air inlets 53. The space inside the first cavity 51 is closed. At this time, the dust removal part 7 located in the first cavity 51 is opened to remove the internal flue gas, and the second cavity 52 continues to take in air through the two air inlets 53 to realize flue gas storage.

[0076] The dust removal process in the first cavity 51 is as follows:

[0077] (1) The dust is removed by the dust removal unit 7 until time t1.

[0078] Specifically, the transformer 73 is turned on to supply negative high voltage electricity to the discharge electrode 72. The discharge electrode 72 ionizes the flue gas, and the dust is charged with negative ions and captured by the dust collecting plate 71. When the time reaches t1, the transformer 73 is stopped from supplying power.

[0079] (2) The discharge electrode 72 and the dust collecting electrode 71 are vibrated by the vibrating device 9 for a period of time T.

[0080] Specifically, the vibration device 9 is turned on and the frames of the discharge electrode 72 and the dust collecting electrode plate 71 are vibrated. The vibration force is transmitted to the discharge electrode 72 and the dust collecting electrode plate 71. The dust accumulated on the discharge electrode 72 and the dust collecting electrode plate 71 destroys the dust layer structure due to vibration and falls downward into the ash hopper 4. When the time T is reached, the vibration device 9 is turned off.

[0081] (3) The dust is removed by the dust removal unit 7 until time t2.

[0082] (4) The discharge electrode 72 and the dust collecting electrode 71 are vibrated by the vibrating device 9 for a period of time T.

[0083] (5)……(n)And so on.

[0084] The dust removal unit 7 and the rapping device 9 in the first cavity 51 are opened and closed alternately in sequence until the dust concentration detector 10 in the first cavity 51 detects that the dust concentration reaches a preset concentration (e.g., 20 mg / m 3 ), after the vibration and dust cleaning is completed, the exhaust port of the first cavity 51 is opened, and the dust-removed flue gas is buffered through the buffer tank 31 and then discharged from the exhaust port.

[0085] The vibration time for each time is the set value T. Since the dust concentration is the highest when the dust is captured for the first time, it is easy to capture dust. The dust collecting plate 71 will capture a large amount of dust in a short time. Since the dust concentration is lower than before when the dust is captured for the nth time, it is not easy to capture dust. The dust collecting plate 71 needs a certain amount of time to capture a certain amount of dust. Therefore, the dust removal time t1, t2...tn is extended in sequence, that is, t1 <t2<……<tn。

[0086] After the dust removal in the first chamber 51 is completed and the smoke is exhausted, the motor 11 drives the transmission shaft 12 to rotate and drives the partition 6 to rotate. Figure 4As shown by the arrows in the figure, plates a and d move closer together, while plates b and c also move closer together, squeezing the second cavity 52 and expanding the space in the first cavity 51. When the partition 6 rotates to the preset position, the second cavity 52 no longer has an air inlet 53, while the first cavity 51 has two air inlets 53, sealing the space within the second cavity 52. ​​At this point, the dust removal unit 7 within the second cavity 52 is opened to remove dust from the internal flue gas, while the first cavity 51 continues to take in air through the two air inlets 53 to store the flue gas.

[0087] The dust removal process of the second cavity 52 is the same as that of the first cavity 51 , and will not be described again for the sake of space.

[0088] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An electrostatic precipitator, characterized in that: It comprises a driving part (1), an air inlet part (2), an air outlet part (3), an ash hopper (4), a shell (5), and a partition (6) arranged in the shell (5); The partition (6) can separate the inner cavity of the shell (5) into a first cavity (51) and a second cavity (52) that are independent of each other, and a dust removal section (7) is provided in each cavity. The dust removal section (7) includes a dust collecting electrode plate (71) and a discharge electrode (72); The top of the shell (5) is provided with an air inlet (53) and an air outlet (54); the air inlet portion (2) can be communicated with each cavity portion through the air inlet (53), and the air outlet portion (3) can be communicated with each cavity portion through the air outlet (54); the bottom of the shell (5) is provided with an ash discharge port (81); the ash hopper (4) can be communicated with each cavity portion through the ash discharge port (81); The driving part (1) is used to drive the partition (6) to move in the housing (5) to change the size of the first cavity (51) and the second cavity (52); The number of the first cavity parts (51) and the number of the second cavity parts (52) are both two, and the two first cavity parts (51) are symmetrically arranged about the center of the shell (5), and the two second cavity parts (52) are symmetrically arranged about the center of the shell (5); The partition (6) comprises two cross-arranged plate bodies.

2. The electrostatic precipitator according to claim 1, characterized in that The housing (5) has a cylindrical structure, the driving portion (1) comprises a motor (11) and a transmission shaft (12), the partition (6) is connected to the transmission shaft (12) and can rotate around the transmission shaft (12) under the driving action of the motor (11), and the side wall of the partition (6) is sealed and fitted with the inner wall of the housing (5).

3. The electrostatic precipitator according to claim 2, characterized in that The air intake portion (2) comprises an air intake duct (21) and an annular flue (22), the air intake duct (21) is in communication with the inlet of the annular flue (22), and the air intake ports (53) are provided below the annular flue (22); The air outlet (3) is arranged at the center of the annular flue (22).

4. The electrostatic precipitator according to claim 3, characterized in that The air inlets (53) are arranged at intervals along the circumference of the annular flue (22); The partition (6) can be rotated to each of the air inlets (53) to be simultaneously connected to the first cavity (51), or simultaneously connected to the second cavity (52).

5. The electrostatic precipitator according to claim 4, characterized in that The air inlet (53) is in a fan-shaped structure, and the center of the fan-shaped structure is arranged on one side facing the center of the shell (5).

6. The electrostatic precipitator according to any one of claims 2 to 5, characterized in that: The intersection of the two plates is located at the transmission shaft (12), and the rotation of the transmission shaft (12) can drive the two plates to rotate, and the rotation directions of the two plates are opposite.

7. The electrostatic precipitator according to any one of claims 3 to 5, characterized in that: The air inlet duct (21) is further provided with a compressor (23).

8. The electrostatic precipitator according to any one of claims 1 to 5, characterized in that: The bottom of the shell (5) is further provided with a sealing plate (8) for sealing the inner cavity, and the sealing plate (8) is provided with the ash discharge ports (81); The edge of the ash discharge port (81) corresponds to the edge of the dust removal part (7) and is located below the dust removal part (7). The ash hopper (4) includes sub-areas (41) that are connected to each of the chambers in a one-to-one correspondence, and each of the sub-areas (41) is independent of each other.

9. The electrostatic precipitator according to claim 8, characterized in that The dust collecting electrode plates (71) of the dust removal section (7) are arranged in a V-shaped structure or a fan-shaped structure.

10. The electrostatic precipitator according to any one of claims 1 to 5, characterized in that: It also includes a rapping device (9) arranged on the top of the shell (5), the rapping device (9) is connected to the discharge electrode (72) and the dust collecting electrode (71) of the dust removal part (7), and is used to provide a rapping force.

11. The electrostatic precipitator according to any one of claims 1 to 5, characterized in that: A dust concentration detector (10) is also provided in each cavity.

12. The electrostatic precipitator according to any one of claims 1 to 5, characterized in that: The gas outlet portion (3) further includes a buffer tank (31) in communication with each of the gas outlets (54).

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