A multi-needle synchronous high-voltage corona discharge device

Abstract

The present invention discloses a multi-needle synchronous high-voltage corona discharge device, which includes a conductive rod and a corona discharge electrode. A plurality of the corona discharge electrodes are arranged along the length direction of the conductive rod. The corona discharge electrode includes a corona discharge distributor and a corona discharge needle. The corona discharge distributor of each corona discharge electrode can be fixed after being rotated and adjusted relative to the conductive rod. A plurality of corona discharge needles are arranged along the circumference of the corona discharge distributor. Each of the corona discharge needles is conductively connected to the conductive rod respectively. The present invention provides a plurality of corona discharge electrodes along the length direction of the conductive rod. The corona discharge distributor of each corona discharge electrode can be fixed after being rotated and adjusted relative to the conductive rod. The corona discharge needles arranged along the circumference of the corona discharge distributor can cover the space in all directions and at multiple levels, so as to realize large-area high-voltage multi-point synchronous corona discharge to generate low-temperature plasma, so as to achieve the flue gas purification effect of efficient removal.

Description

Technical Field

[0001] The invention relates to the application fields of power pulse technology and low-temperature plasma technology, and in particular to a multi-needle synchronous high-voltage corona discharge device. Background Art

[0002] Low-temperature plasma has the characteristics of high electron temperature and low gas temperature, so it has attracted more and more attention in the fields of desulfurization and denitrification, removal of toxic and harmful substances, and environmental governance. Among them, pulsed corona discharge low-temperature plasma has its unique advantages in flue gas desulfurization and denitrification compared with other traditional flue gas desulfurization and denitrification technologies: the short pulse in the pulsed corona discharge allows more energy to be transferred to the electrons, while the gas molecules are not heated, so it has the characteristics of higher removal efficiency and more energy saving. At present, this technology has been recognized as the most competitive and promising flue gas purification technology.

[0003] The corona discharge electrode device is one of the most important components in the industrial application of low-temperature plasma. It directly determines the output characteristics of the low-temperature plasma industrial flue gas multi-pollution comprehensive removal system. Compared with the current desulfurization and denitrification technology, low-temperature plasma desulfurization and denitrification has many advantages such as high efficiency, low cost, and simultaneous removal of multiple pollutants. The working principle of the corona discharge electrode device is generally as follows: the corona discharge electrode and the grounding electrode form a needle-plate type uneven electric field. When a nanosecond short pulse voltage is applied to the corona discharge electrode device to form a short pulse corona discharge, the high-energy electrons in the plasma generated by the pulse corona discharge collide with gas molecules such as N2, HO, and O2 to produce free radicals and active species with strong chemical activity, such as OH, O, H, N, HO2, O3, Nt, N2, O2, etc. They play an extremely important role in the removal of SO2 and NOx. Among them, the OH free radical, which has a strong oxidizing property, plays the most important role in the removal process.

[0004] However, when applied to industrial flue gas treatment, how to ensure the realization of large-area high-voltage multi-point synchronous corona discharge to generate stable low-temperature plasma and reduce SO2 and NO in the flue gas? X 、VOC S One of the difficulties is to remove toxic and harmful substances and achieve efficient purification effect. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-needle synchronous high-voltage corona discharge device, which can realize large-area high-voltage multi-point synchronous corona discharge to generate low-temperature plasma, so as to achieve efficient removal of SO2, NO X 、VOC S The flue gas purification effect of toxic and harmful substances.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A multi-needle synchronous high-voltage corona discharge device comprises a conductive rod and a corona discharge electrode. A plurality of the corona discharge electrodes are arranged along the length direction of the conductive rod. The corona discharge electrode comprises a corona discharge distributor and a corona discharge needle. The corona discharge distributor of each corona discharge electrode can be rotated relative to the conductive rod to adjust the angle and then fixed. A plurality of the corona discharge needles are arranged along the circumference of the corona discharge distributor. Each of the corona discharge needles is conductively connected to the conductive rod respectively.

[0008] Furthermore, the corona discharge distributors are nested in series and installed on the conductive rods.

[0009] Furthermore, the corona discharge distributor is provided with a through hole for the conductive rod to pass through, and the upper and lower ends of the corona discharge distributor are respectively provided with a first positioning structure and a second positioning structure, and the first positioning structure of the corona discharge distributor is nested and connected with the second positioning structure of another adjacent corona discharge distributor.

[0010] Furthermore, the first positioning structure is in the shape of an annular step, and the second positioning structure is in the shape of an annular flange.

[0011] Furthermore, the corona discharge distributor is provided with a plurality of first mounting holes opening toward its upper end or lower end, the side of the corona discharge distributor is provided with a plurality of second mounting holes, each of the second mounting holes is respectively connected to one of the first mounting holes, the corona discharge needle is accommodated in the second mounting hole, and the corona discharge electrode also includes a voltage divider, which is accommodated in the first mounting hole and is respectively conductively connected to the conductive rod and the corona discharge needle.

[0012] Furthermore, the corona discharge electrode also includes a conductive flange, which is screwed into the conductive rod by screws to limit the position of the corona discharge distributor after the angle is adjusted relative to the conductive rod, and the conductive flange is conductively connected to the voltage divider.

[0013] Furthermore, the shape of the corona discharge distributor includes but is not limited to a cylindrical shape and a regular polygonal prism shape, and the corona discharge distributor is provided with a plurality of the first mounting holes and the second mounting holes at equal angles along its circumference, and the angle between adjacent second mounting holes is between 5° and 60°.

[0014] Furthermore, it also includes an upper head, which is made of insulating material and includes a cylinder and a covering tube. The cylinder is nested and connected with the first positioning structure of the corona discharge distributor located at the uppermost end of the conductive rod. The top of the cylinder extends upward to form the covering tube, and the covering tube is sleeved outside the conductive rod.

[0015] Furthermore, it also includes a grounding electrode, which includes a plurality of grounding tubes, and the corona discharge electrode is respectively arranged in each of the grounding tubes.

[0016] Furthermore, the shape of the grounding tube includes but is not limited to a cylindrical tube and a regular polygonal tube, and each of the grounding tubes is arranged longitudinally into a honeycomb structure or a matrix structure.

[0017] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0018] 1. The present invention is provided with a plurality of corona discharge electrodes along the length direction of the conductive rod. The corona discharge distributor of each corona discharge electrode can be rotated relative to the conductive rod to adjust the angle and then fixed, so that the corona discharge needles arranged along the circumference of the corona discharge distributor can cover the space in all directions and at multiple levels, realizing large-area high-voltage multi-point synchronous corona discharge to generate low-temperature plasma, so as to achieve efficient removal of SO2 and NO X 、VOC S The flue gas purification effect of toxic and harmful substances.

[0019] 2. In the present invention, the corona discharge distributors are installed on the conductive rod in a series nested manner, which not only can freely adjust the number of corona discharge distributors nested in series, so as to flexibly select the power capacity according to the actual flue gas treatment working conditions, but also through the tight nested connection, the accuracy of the series installation of each corona discharge distributor can be guaranteed. At the same time, the series nested structure forms a good enclosed space inside the corona discharge distributor, ensuring that the corona discharge distributor has good dustproof, waterproof and insulating properties, and plays a role in isolating flue gas and protecting internal components, thereby improving the service life of the product.

[0020] 3. In the present invention, the corona discharge distributor is provided with a plurality of second mounting holes at equal angles along its circumference. After the corona discharge needle is accommodated in the second mounting hole, the corona discharge needle of one corona discharge distributor can cover the entire plane 360°. After multiple corona discharge distributors are nested in series and rotated and misaligned, the corona discharge needle can cover the entire space at multiple levels, further realizing a multi-angle and large-area synchronous discharge effect.

[0021] 4. The present invention uses a threaded connection method to fasten the current-conducting flange inside the corona discharge distributor to the conductive rod. This method not only increases the conductive contact surface, making the conduction reliable, but also ensures the structural strength.

[0022] 5. In the present invention, the grounding tubes are arranged longitudinally into a honeycomb structure or a matrix structure of the grounding electrode. Compared with the horizontal needle plate structure, it is not only closer to practical application and has more uniform discharge characteristics, but also the longitudinal structure improves the space utilization rate, and there is no obstruction in the middle, which reduces the resistance of the overall system and reduces the operating cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the installation of the corona discharge electrode in the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the decomposition of

[0025] Figure 3 for Figure 1 A top view of

[0026] Figure 4 is a three-dimensional schematic diagram of a corona discharge electrode in the present invention;

[0027] Figure 5 is a cross-sectional view of a corona discharge electrode in the present invention;

[0028] Figure 6 It is one of the structural schematic diagrams of the corona discharge distributor in the present invention;

[0029] Figure 7 for Figure 6 A cross-sectional view of

[0030] Figure 8 This is the second structural schematic diagram of the corona discharge distributor in the present invention;

[0031] Fig. 9 The third structural diagram of the corona discharge distributor in the present invention;

[0032] Fig.10 This is one of the structural schematic diagrams of the grounding electrode in the present invention;

[0033] Fig.11 This is the second structural schematic diagram of the grounding electrode in the present invention;

[0034] Fig.12 This is the third structural schematic diagram of the grounding electrode in the present invention;

[0035] Fig.13 This is the fourth structural schematic diagram of the grounding electrode in the present invention.

[0036] Description of reference numerals:

[0037] Conductive rod 100;

[0038] Corona discharge electrode 200, corona discharge distributor 210, through hole 211, first positioning structure 212, second positioning structure 213, first mounting hole 214, second mounting hole 215, corona discharge needle 220, voltage divider 230, current transfer flange 240;

[0039] Upper head 300, cylinder 320, cladding tube 310;

[0040] Grounding electrode 400. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] Example

[0044] Cooperate Figures 1 to 4 As shown, the present invention discloses a multi-needle synchronous high-voltage corona discharge device, including a conductive rod 100, a corona discharge electrode 200, an upper sealing head 300 and a grounding electrode.

[0045] Several corona discharge electrodes 200 are arranged along the length direction of the conductive rod 100. The corona discharge electrodes 200 include a corona discharge distributor 210 and a corona discharge needle 220. The corona discharge distributor 210 of each corona discharge electrode 200 can be fixed after rotating and adjusting the angle relative to the conductive rod 100. Several corona discharge needles 220 are arranged along the circumference of the corona discharge distributor 210. Each corona discharge needle 220 is electrically connected to the conductive rod 100. The power supply is connected through the conductive rod 100, and the high voltage is transmitted from the conductive rod 100 to the corona discharge electrode 200. After conversion by the corona discharge distributor 210, it is synchronously discharged to each surface of the grounding electrode through the corona discharge needle 220.

[0046] The conductive rod 100 is a metal tube (preferably a galvanized round steel tube). The upper and lower ends of the conductive rod 100 are processed with threads. The upper thread is chamfered on both sides for connecting the power supply line and hanging and fixing. The chamfering plays a positioning role. The lower thread is used to connect the nut. The bottom of the corona discharge distributor 210 at the bottom is fitted with the nut for positioning. The positioning method of the nut is conducive to fine-tuning the axial installation error of each corona discharge distributor, which is convenient for overall nesting assembly. The conductive rod 100 is processed with a plurality of threaded holes along its length. According to the number of nesting of the corona discharge distributor 210, the threaded holes are used to cooperate with screws to fix the corona discharge distributor 210.

[0047] Cooperate Figure 1 , Figures 4 to 7 As shown, the corona discharge distributors 210 are nested in series and installed on the conductive rod 100. Not only can the number of the corona discharge distributors 210 nested in series be freely adjusted to facilitate flexible selection of power capacity according to actual flue gas treatment conditions, but also the accuracy of the series installation of each corona discharge distributor 210 can be ensured through tight nesting connection. At the same time, the series nesting structure forms a good enclosed space inside the corona discharge distributor 210, ensuring that the corona discharge distributor 210 has good dustproof, waterproof and insulating properties, and plays a role in isolating flue gas and protecting internal components, thereby increasing the service life of the product.

[0048] The corona discharge distributor 210 is provided with a through hole 211 for the conductive rod 100 to pass therethrough, and the upper and lower ends of the corona discharge distributor 210 are respectively formed with a first positioning structure 212 and a second positioning structure 213, and the first positioning structure 212 of the corona discharge distributor 210 is nested and connected with the second positioning structure 213 of another adjacent corona discharge distributor 210. In this embodiment, the first positioning structure 212 is in the shape of an annular step, and the second positioning structure 213 is in the shape of an annular flange. Of course, the first positioning structure 212 and the second positioning structure 213 can also be arranged on the corresponding sides in reverse.

[0049] The corona discharge distributor 210 is provided with a plurality of first mounting holes 214 opening toward the upper end or the lower end thereof, and the side of the corona discharge distributor 210 is provided with a plurality of second mounting holes 215, each of the second mounting holes 215 is respectively connected with one of the first mounting holes 214, and the corona discharge needle 220 is accommodated in the second mounting hole 215 through the needle sleeve, and the corona discharge electrode 200 further includes a voltage divider 230, which is accommodated in the first mounting hole 214 and is respectively conductively connected with the conductive rod 100 and the corona discharge needle 220. In this embodiment, in order to facilitate installation and ensure that the needle sleeve threaded hole in the second mounting hole 215 is vertically upward, the second mounting hole 215 adopts a chamfered hole, and the chamfered hole structure is used for positioning, which can ensure the installation accuracy of the corona discharge needle 220, and the shape of the chamfered hole includes but is not limited to a chamfered cylindrical hole, a square hole, and any shape with a positioning edge.

[0050] Cooperate Figures 6 to 9 As shown, in this embodiment, the shape of the corona discharge distributor 210 includes but is not limited to a cylindrical shape and a regular polygonal prism shape. The corona discharge distributor 210 is processed by compression molding to ensure the consistency and accuracy of each corona discharge distributor. The corona discharge distributor 210 can adopt the following shape structure: First, refer to Figure 6 As shown, a cylindrical structure is adopted; reference Figure 8 As shown, a six-sided column structure is adopted, which is convenient for matching with the grounding electrode of the six-sided honeycomb tube structure; thirdly, reference Fig. 9 As shown, a square structure is adopted, and each surface can be provided with a plurality of corona discharge needles 220. The corona discharge distributor 210 is provided with a plurality of first mounting holes 214 and second mounting holes 215 at equal angles along its circumference, and the angle between adjacent second mounting holes 215 is between 5° and 60°.

[0051] After the corona discharge needle 220 is accommodated in the second mounting hole 215, the corona discharge needle 220 of a corona discharge distributor can cover the entire plane 360°. After multiple corona discharge distributors 210 are nested in series and rotated and misaligned, the corona discharge needle 220 can cover the entire space at multiple levels, achieving a multi-angle, large-area, multi-needle synchronous corona discharge effect. For example: the angle between two adjacent corona discharge needles 220 is 60°, and four layers are nested as a unit, and each layer is nested at a staggered angle of 15°, that is, a unit has 24 corona discharge needles 220 for 360° coverage, so that the spatial coverage of the corona discharge needle 220 is more comprehensive. Of course, the angle between the two corona discharge needles 220 can be designed accordingly, such as 30°, 45°, and the staggered angle of each nesting layer can also be selected according to actual needs, such as 5°, 10°, 15°, etc.

[0052] Cooperate Figure 2 , Figures 4 to 7As shown, the corona discharge electrode 200 also includes a conductive flange 240, which is screwed into the conductive rod 100 by screws to limit the position of the corona discharge distributor 210 after the angle is adjusted relative to the conductive rod 100. The conductive flange 240 is conductively connected to the voltage divider 230. The angle adjustment of the corona discharge distributor 210 is achieved through the conductive flange 240, that is, the connection holes on the conductive rod 100 can be set according to the requirements. The orientation of the holes makes the orientation of the through holes on the conductive flange 240 of each layer of the corona discharge electrode 200 form an equally divided angle, so that the corona discharge distributor 210 presents an angular dislocation. After loosening the screws, the corona discharge distributor 210 can be rotated to the required angle. The conductive flange 240 is fastened to the conductive rod 100 by a threaded connection method, which can not only increase the conductive contact surface, make the conductivity reliable, but also ensure the structural strength.

[0053] The upper end cap 300 is made of insulating material, and includes a cylinder 320 and a covering tube 310. The cylinder 320 is nested and connected with the first positioning structure 212 of the corona discharge distributor 210 located at the uppermost end of the conductive rod 100. The top of the cylinder 320 extends upward to form the covering tube 310, and the covering tube 310 is sleeved outside the conductive rod 100. In this embodiment, the interior of the cylinder 320 is hollowed out to reserve a nesting space, and the outer corners are rounded to reduce airflow resistance.

[0054] Cooperate Figure 1 , Figures 10 to 13 As shown, the grounding electrode 400 includes a plurality of grounding tubes, each of which is provided with a corona discharge electrode 200. The shape of the grounding tube includes but is not limited to a cylindrical tube and a regular polygonal tube. Each grounding tube is arranged longitudinally into a honeycomb structure or a matrix structure. The top ends of the conductive rods of each corona discharge electrode 200 are connected to each other and then connected to a short pulse high voltage power supply. In actual industrial flue gas treatment applications, the grounding electrode is installed in a longitudinal honeycomb or matrix manner. Compared with the horizontal needle plate structure, it has at least the following advantages: First, it is installed in the same manner as the SCR denitration catalyst, which is conducive to directly replacing the current denitration device and is closer to practical application; second, the longitudinal honeycomb or matrix structure is a relatively mature processing technology at present, and its accuracy and overall verticality are reliably guaranteed, and the corona discharge characteristics are more uniform, while the horizontal needle plate structure is difficult to ensure accuracy through adjustment; third, the longitudinal structure improves the space utilization rate, and there is no obstruction in the middle, which reduces the resistance of the overall system and reduces the operating cost of the equipment.

[0055] In this embodiment, the grounding electrode can adopt the following four structural forms: First, refer to Fig.10 As shown, the six-sided honeycomb tube structure can be used to share two sides, improve space utilization, and reduce system resistance. The honeycomb structure sheet metal processing technology is mature, which is conducive to controlling the processing accuracy. Second, refer to Fig.11 As shown, a circular tubular honeycomb structure is adopted; thirdly, reference Fig.12 As shown, the circular tube matrix arrangement structure is adopted. Compared with the six-sided honeycomb tube structure and the circular tube honeycomb structure, the circular tube matrix arrangement structure is easier to process and easier to achieve the precision requirements in processing; Fourth, refer to Fig.13 As shown, the square tube matrix structure can realize the sharing of two sides compared with the circular tube matrix arrangement structure. Although it reduces the material cost, the angle of the corona discharge needle cannot be adjusted arbitrarily, the coverage effect is poor, and the efficiency of pollutant removal may be reduced. In summary, among the above four structural forms, the circular tube matrix arrangement structure is preferred for the grounding electrode.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-needle synchronous high-voltage corona discharge device, characterized in that: It comprises a conductive rod and a corona discharge electrode, wherein a plurality of the corona discharge electrodes are arranged along the length direction of the conductive rod, the corona discharge electrode comprises a corona discharge distributor and a corona discharge needle, the corona discharge distributor of each corona discharge electrode can be rotated relative to the conductive rod to adjust the angle and then fixed, a plurality of the corona discharge needles are arranged along the circumference of the corona discharge distributor, and each of the corona discharge needles is respectively conductively connected to the conductive rod; The corona discharge distributor is nested in series and installed on the conductive rod. A plurality of second installation holes are opened on the side of the corona discharge distributor. The corona discharge needles are accommodated in the second installation holes. The nested structure in series forms a closed space inside the corona discharge distributor.

2. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 1, characterized in that: The corona discharge distributor is provided with a through hole for the conductive rod to pass through, and the upper and lower ends of the corona discharge distributor are respectively formed with a first positioning structure and a second positioning structure, and the first positioning structure of the corona discharge distributor is nested and connected with the second positioning structure of another adjacent corona discharge distributor.

3. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 2, characterized in that: The first positioning structure is in the shape of an annular step, and the second positioning structure is in the shape of an annular flange.

4. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 1, characterized in that: The corona discharge distributor is provided with a plurality of first mounting holes opening toward the upper end or the lower end thereof, each of the second mounting holes is respectively connected with one of the first mounting holes, and the corona discharge electrode further comprises a voltage divider, which is accommodated in the first mounting hole and is respectively conductively connected with the conductive rod and the corona discharge needle.

5. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 4, characterized in that: The corona discharge electrode further comprises a conductive flange, which is screwed into the conductive rod by screws to limit the position of the corona discharge distributor after the angle is adjusted relative to the conductive rod, and the conductive flange is conductively connected to the voltage divider.

6. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 4, characterized in that: The corona discharge distributor has a cylindrical shape or a regular polygonal prism shape. The corona discharge distributor is provided with a plurality of first mounting holes and second mounting holes at equal angles along its circumference, and the angle between adjacent second mounting holes is between 5° and 60°.

7. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 2, characterized in that: It also includes an upper head, which is made of insulating material and includes a cylinder and a covering tube. The cylinder is nested and connected with the first positioning structure of the corona discharge distributor located at the uppermost end of the conductive rod. The top of the cylinder extends upward to form the covering tube, and the covering tube is sleeved outside the conductive rod.

8. A multi-needle synchronous high-voltage corona discharge device according to any one of claims 1 to 7, characterized in that: It also includes a grounding electrode, which includes a plurality of grounding tubes, and each of the grounding tubes is respectively provided with the corona discharge electrode.

9. A multi-needle synchronous high-voltage corona discharge device as claimed in claim 8, characterized in that: The grounding tube is in the shape of a cylindrical tube or a regular polygonal tube, and each of the grounding tubes is arranged longitudinally into a honeycomb structure or a matrix structure.

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