CN108114814B - Electrostatic dust collection device - Google Patents
Electrostatic dust collection device Download PDFInfo
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- CN108114814B CN108114814B CN201711374329.4A CN201711374329A CN108114814B CN 108114814 B CN108114814 B CN 108114814B CN 201711374329 A CN201711374329 A CN 201711374329A CN 108114814 B CN108114814 B CN 108114814B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/41—Ionising-electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/86—Electrode-carrying means
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Abstract
The invention belongs to the field of low-temperature non-equilibrium plasma discharge, and provides an electrostatic dust removal device, which comprises: the dust collector comprises a shell, wherein an air inlet and an air outlet are respectively arranged at two ends of the shell, and a W-shaped dust collecting groove is arranged at the lower end of the shell; the power supply device is arranged at the top end of the shell and provides a high-voltage direct-current power supply for the sheet-shaped discharge electrode; the corona generating device is composed of a sheet-shaped discharge electrode and a grounding polar plate and is arranged in the ventilation cavity of the shell. Compared with the prior art, the invention has the advantages that the brush-shaped corona discharge channels generated by the sheet-shaped discharge electrode are more uniformly distributed, and have higher breakdown voltage, so that the maximum discharge power density of the electrode structure is higher. The charge quantity of dust particles can be effectively improved based on higher discharge power density, and the aim of high-efficiency dust removal is finally achieved. The invention fixes the sheet-shaped discharge electrode array through the PCB, can effectively improve the insulation performance of the device, and has the advantages of quickly adjusting the arrangement of the discharge array and the discharge power.
Description
Technical Field
The invention belongs to the field of low-temperature non-equilibrium plasma discharge, and particularly relates to an electrostatic dust collection device.
Background
The rapid development of economy and society in China causes huge energy consumption, which causes particulate pollution to become one of the most serious atmospheric environmental problems, wherein the pollution problem of fine particulate matters (PM2.5) is particularly prominent. Particularly, the haze weather which frequently appears in recent years has serious influence on the production and social activities of people. The dust removing device is an effective way for removing fly ash in the flue gas, and is widely applied to industries such as chemical industry, petroleum industry, metallurgy industry, power generation industry and the like. The discharge structure of the existing electrostatic dust collection device is mostly wire-plate type or wire-cylinder type. To increase the discharge power density of the device, polar lines and polar plates have been further developed, wherein the polar lines include circular polar lines, barbed lines, spiral lines, star-shaped lines, etc., and discharge areas are generated through tips, but at the same time, the intensity and uniformity of an electric field in a gap are limited; the polar plate is provided with a C-shaped plate, a V-shaped plate and the like. However, the corona discharge area formed by these discharge structures is small and only exists near the polar line, so that a large area of corona discharge area cannot be realized in the discharge channel, and the charging effect of the fly ash particles is not ideal. In addition, since the electric field distribution around the electrode lines is non-uniform, gap breakdown is easily caused by thermal instability at a slightly higher operating voltage, and thus the discharge power density of the electrode structure is greatly limited.
Disclosure of Invention
The invention provides an electrostatic dust removal device aiming at overcoming the defects or the improvement requirements of the prior art, and aims to solve the technical problem that the conventional electrostatic dust removal device is poor in dust removal effect due to the defects of non-uniform corona discharge channels, low breakdown voltage, low maximum discharge power density and the like.
The invention provides an electrostatic dust removal device, comprising: the dust collector comprises a shell, a dust collecting groove and a dust collecting groove, wherein the two ends of the shell are respectively provided with an air inlet and an air outlet; corona generating device sets up in the cavity of ventilating, includes: a sheet-shaped discharge electrode and a grounding polar plate; the power supply device is arranged at the top end of the shell and used for providing a high-voltage direct-current power supply for the sheet-shaped discharge electrode; and the rapping device is close to the corona generating device and used for shaking off the fly ash particles adsorbed on the grounding polar plate through periodic vibration and discharging the fly ash particles through the dust collecting groove.
Furthermore, the dust collecting groove is of a W-shaped structure; after the dust falls into the dust collecting groove with the W-shaped structure, the dust is automatically deposited at the bottom of the groove under the action of gravity and is discharged due to the inclined groove wall of the dust collecting groove with the W-shaped structure, and meanwhile, secondary dust raising caused by wind can be avoided due to the fact that the wind is not easy to blow into the dust collecting groove with the W-shaped structure.
Further, the sheet-shaped discharge electrode was a 30mm × 10mm rectangle provided at its sharp corners with a chamfer of 3mm in radius.
Furthermore, a plurality of the sheet-shaped discharge electrodes are arranged in parallel and staggered with the grounding polar plate after forming an array, so that an S-shaped ventilation channel is formed. The brush-shaped corona discharge channels generated by the sheet discharge electrode are more uniformly distributed and have higher breakdown voltage, so that the maximum discharge power density of the electrode structure is higher. The charge quantity of dust particles can be effectively improved based on higher discharge power density, and the aim of high-efficiency dust removal is finally achieved.
Furthermore, the distance between the sheet-shaped discharge electrode and the grounding polar plate is adjustable.
Furthermore, the sheet-shaped discharge electrode and the grounding polar plate are both made of stainless steel. The stainless steel has the advantages of corrosion resistance and high temperature resistance, is suitable for severe environments (indoor and outdoor environments such as wet environment, acid-base environment and the like), and avoids the condition that the discharge power is reduced due to the rusting of the electrode.
Furthermore, the high-voltage polar plate made of the PCB is used for installing the array formed by the plurality of sheet-shaped discharge electrodes, so that the insulating property of the device can be effectively improved, and the device also has the advantages of quickly adjusting the discharge array arrangement and the discharge power.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the sheet-shaped discharge electrode used in the device of the invention firstly generates corona discharge at the chamfer after the voltage is increased. With the continuous rise of the voltage, the corona discharge area gradually develops from the two ends of the sheet-shaped discharge electrode to the middle, and finally the discharge area occupies the edge of the electrode and forms a bright blue curtain-shaped discharge area in the corona discharge channel. The corona distribution of the novel sheet discharge electrode is more uniform, and the probability of breakdown caused by thermal instability is effectively reduced. Therefore, a higher breakdown voltage and a higher maximum discharge power density are achieved.
(2) The device can adjust the distance between the sheet-shaped discharge electrode and the grounding polar plate according to the actual condition, thereby achieving the purpose of properly adjusting the discharge power according to the corona onset voltage and the breakdown voltage and further achieving the purpose of controlling the adsorption efficiency.
(3) The device of the invention designs the S-shaped channel to lengthen the effective length of the fly ash particles passing through the corona discharge area and improve the charging and adsorption efficiency of the fly ash particles. In addition, the device can effectively solve the problem of secondary dust emission caused by rapping based on a longer effective action channel.
(4) The invention fixes the sheet-shaped discharge electrode array through the PCB, can effectively improve the insulation performance of the device, and has the advantage of quickly adjusting the arrangement of the discharge array.
Drawings
FIG. 1 is a schematic structural diagram of an electrostatic precipitator according to the present invention;
figure 2 is a top view of a corona generating device provided by the present invention;
FIG. 3 is a structural parameter diagram of a corona generating device according to the present invention;
wherein: the device comprises a shell 1, a power supply device 2, a corona discharge device 3, a rapping device 4, a dust collecting tank 5, a PCB high-voltage polar plate 6, a sheet-shaped discharge electrode 7 and a grounding polar plate 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides an electrostatic dust removal device, comprising: the device comprises a shell, a power supply device, a corona generating device and a rapping device; the casing is structurally divided into an upper casing and a lower casing. Wherein, a power supply device and a rapping device are arranged above the upper casing, and a W-shaped dust collecting groove is arranged on the lower casing; the shell is sequentially provided with an air inlet, an air cavity and an air outlet, and a corona generating device is arranged in the air cavity. The material of the casing can be stainless steel iron plate. And the power supply device is connected with the corona generating device and is used for improving the stability of the negative polarity direct current power supply. The corona generator consists of a sheet discharge electrode array and a grounding polar plate. The invention can install the sheet-shaped discharge electrode array through the high-voltage polar plate made of the PCB. The sheet-shaped discharge electrode and the grounding polar plate are made of stainless steel.
As an embodiment of the present invention, the sheet-shaped discharge electrode is a rectangle of 30mm × 10mm, and is provided at its sharp corners with a chamfer of 3mm in radius. When the voltage applied to the sheet-like discharge electrode is gradually increased, corona discharge occurs first at the portion in the sheet-plate gap because the local electric field intensity at the chamfer is high. Then, along with the voltage rise, the corona discharge channel gradually develops from two ends to the middle of the sheet-shaped discharge electrode, and finally, a uniform brush-shaped corona discharge channel is formed in the sheet-plate gap. Electrons, positive ions and negative ions generated by corona discharge enable the fly ash in the flue gas to complete charging in a composite mode, and under the action of an electric field force, dirt particles complete adsorption, and the aim of dust removal is finally achieved.
In the embodiment of the invention, in order to realize the charging and adsorption of the fly ash particles, the grounding polar plates and the sheet-shaped discharge electrode arrays are arranged in parallel in a staggered manner to form the S-shaped ventilation duct so as to improve the dust removal effect of the device. The rapping device is close to the corona generating device. The fly ash particles adsorbed on the grounding polar plate are shaken off by periodic vibration and discharged through a W-shaped dust collecting groove at the bottom of the machine shell.
To further illustrate the electrostatic precipitator provided in the embodiment of the present invention, the following is detailed with reference to fig. 1 to 3:
the electrostatic dust removal device provided by the invention comprises: the device comprises a machine shell 1, a power supply device 2, a corona generating device 3 and a rapping device 4; the housing 1 is structurally divided into an upper housing and a lower housing. Wherein, a power supply device 2 and a rapping device 4 are arranged above the upper machine shell, and a W-shaped dust collecting groove 5 is arranged on the lower machine shell; the shell 1 is divided from the ventilation structure and is sequentially provided with an air inlet, a ventilation cavity and an air outlet. Wherein, a corona generating device 3 is arranged in the ventilation cavity. The material of the casing 1 is stainless steel iron plate.
The power supply device 2 is connected to the corona generator 3 and provides a stable negative dc power supply.
The corona generating device 3 includes: an array of a plurality of sheet-like discharge electrodes 7 and a ground electrode plate 8; wherein the sheet-like discharge electrode array 7 is mounted through a high voltage electrode plate 6 made of a PCB board. The sheet-shaped discharge electrode 7 and the grounding polar plate 8 are both made of stainless steel.
The sheet-like discharge electrode 7 may be a rectangle of 30mm × 10mm, and a chamfer with a radius of 3mm is provided at a sharp corner thereof. When the voltage applied to the sheet-like discharge electrode 7 is gradually increased, corona discharge occurs first at the portion in the sheet-plate gap because the local electric field intensity at the chamfer is high. Then, along with the voltage rise, the corona discharge channel gradually develops from two ends to the middle of the sheet-shaped discharge electrode, and finally, a uniform brush-shaped corona discharge channel is formed in the sheet-plate gap. Electrons, positive ions and negative ions generated by corona discharge enable the fly ash in the flue gas to complete charging in a composite mode, and under the action of an electric field force, dirt particles complete adsorption, and the aim of dust removal is finally achieved.
In order to realize the charging and adsorption of the fly ash particles, the sheet-shaped discharge electrode array 7 and the grounding polar plate 8 are arranged in parallel and staggered to form an S-shaped air duct so as to improve the dust removal effect of the device. The rapping device 4 is proximate to the corona generating device 3. The fly ash particles adsorbed on the grounding polar plate are shaken off by periodic vibration and discharged through a W-shaped dust collecting groove 5 at the bottom of the machine shell.
The working principle of the electrostatic dust collector provided by the invention is that a direct-current high voltage is applied between the sheet-shaped discharge electrode 7 and the grounding polar plate 8, so that corona discharge is generated around the sheet-shaped discharge electrode. Under the action of high field intensity, the gas in the gap undergoes reactions such as collision ionization, excitation, adhesion, decomposition and the like to generate freely moving electrons, negative ions and positive ions. In the corona discharge area near the sheet discharge electrode, a large amount of electrons, negative ions and positive ions are attached to the fly ash particles to complete the charging process. Under the action of strong electric field force in the sheet-plate gap, the charged fly ash particles move to the polar plate and complete adsorption. Further, under the action of the vibration device, the fly ash is shaken off from the grounding polar plate and is discharged out of the device through the W-shaped dust collecting groove at the lower end of the machine shell.
In addition, in the electrostatic dust removal device provided by the invention, the distance between the sheet-shaped discharge electrode and the grounding polar plate is adjustable, and the distance between the high-voltage sheet-shaped discharge electrode and the grounding polar plate can be properly adjusted according to the numerical value of the corona starting voltage. Meanwhile, under the condition of low requirement on discharge power or low output voltage, corona discharge can be generated by changing the distance between the high-voltage sheet discharge electrode and the grounding electrode plate to reduce the corona voltage, so that the effect of eliminating fly ash particles is achieved. If the discharge power needs to be enhanced, the distance between the high-voltage sheet-like discharge electrode and the grounding electrode plate and the DC power voltage can be increased.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. An electrostatic precipitator, comprising:
the dust collector comprises a machine shell (1), wherein an air inlet and an air outlet are respectively arranged at two ends of the machine shell, an air cavity is formed between the air inlet and the air outlet, and a dust collecting groove (5) is arranged at the lower end of the machine shell;
corona generating device (3), set up in the cavity of ventilating, include: a sheet-shaped discharge electrode (7) and a grounding polar plate (8); the sheet-shaped discharge electrode (7) is rectangular, and a chamfer is arranged at the sharp corner of the sheet-shaped discharge electrode;
the power supply device (2) is arranged at the top end of the shell and used for providing a high-voltage direct-current power supply for the flaky discharge electrode; and
the rapping device (4) is close to the corona generating device (3) and is used for shaking off the fly ash particles adsorbed on the grounding polar plate through periodic vibration and discharging the fly ash particles through the dust collecting groove (5);
the sheet-shaped discharge electrode (7) is a rectangle with the diameter of 30mm multiplied by 10mm, and a chamfer with the radius of 3mm is arranged at the sharp corner of the sheet-shaped discharge electrode;
the edge of the flaky discharge electrode (7) is over against the grounding polar plate (8), and the distance between the flaky discharge electrode (7) and the grounding polar plate (8) is adjustable;
mounting an array of a plurality of said sheet-like discharge electrodes (7) by means of a high voltage plate (6) made of a PCB board;
when the voltage of the sheet-shaped discharge electrode rises, firstly generating corona discharge at the chamfer; with the continuous rise of the voltage, the corona discharge area gradually develops from the two ends of the sheet-shaped discharge electrode to the middle, and finally the discharge area occupies the edge of the electrode and forms a bright blue curtain-shaped discharge area in the corona discharge channel; the corona distribution is more uniform, and the probability of breakdown caused by thermal instability is effectively reduced; has higher breakdown voltage and higher maximum discharge power density.
2. An electrostatic precipitator according to claim 1, in which the dust collecting tank (5) is of W-shaped configuration.
3. An electrostatic precipitator according to any of claims 1-2, wherein a plurality of said sheet-like discharge electrodes (7) are arranged in an array and then staggered in parallel with said ground electrode plate (8) to form an S-shaped air duct.
4. An electrostatic precipitator according to any of claims 1-2, wherein the sheet-like discharge electrode (7) and the earth plate (8) are made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711374329.4A CN108114814B (en) | 2017-12-19 | 2017-12-19 | Electrostatic dust collection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711374329.4A CN108114814B (en) | 2017-12-19 | 2017-12-19 | Electrostatic dust collection device |
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| CN108114814A CN108114814A (en) | 2018-06-05 |
| CN108114814B true CN108114814B (en) | 2020-02-14 |
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| CN201711374329.4A Active CN108114814B (en) | 2017-12-19 | 2017-12-19 | Electrostatic dust collection device |
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| CN108906325A (en) * | 2018-06-11 | 2018-11-30 | 华中科技大学 | A kind of semiclosed tunnel vehicle exhaust remove device in city |
| CN109277197A (en) * | 2018-09-21 | 2019-01-29 | 湖北邵环保科技有限公司 | A kind of high-pressure electrostatic precipitation method and apparatus |
| CN112218494B (en) * | 2020-09-29 | 2022-03-08 | 四川长虹电器股份有限公司 | Ion fan radiator |
| CN112728718B (en) * | 2020-12-28 | 2022-09-06 | 杭州永青环保技术有限公司 | Plasma fire-fighting smoke-removing equipment and smoke-removing and person-saving method thereof |
| CN113399116B (en) * | 2021-06-28 | 2023-04-04 | 江苏先竞等离子体技术研究院有限公司 | Blade-shaped corona electrode and discharging device using same |
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2017
- 2017-12-19 CN CN201711374329.4A patent/CN108114814B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203678535U (en) * | 2013-12-27 | 2014-07-02 | 武汉龙净环保科技有限公司 | Electric dust collector capable of remarkably improving dust collection efficiency |
| CN203830153U (en) * | 2014-02-19 | 2014-09-17 | 中国日用化学工业研究院 | High-gas-velocity dish type cathode for wet type electrostatic demister |
| CN203778198U (en) * | 2014-04-22 | 2014-08-20 | 金烈水 | Coulomb electric dedustor |
| CN204107662U (en) * | 2014-09-16 | 2015-01-21 | 孙红梅 | Be provided with the air purifier rotating corona electrode |
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