CN115301411B - Self-heating non-ash-sticking discharge electrode and preparation method thereof - Google Patents
Self-heating non-ash-sticking discharge electrode and preparation method thereof Download PDFInfo
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- CN115301411B CN115301411B CN202210872324.9A CN202210872324A CN115301411B CN 115301411 B CN115301411 B CN 115301411B CN 202210872324 A CN202210872324 A CN 202210872324A CN 115301411 B CN115301411 B CN 115301411B
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Classifications
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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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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- B32B2262/103—Metal fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B2262/14—Mixture of at least two fibres made of different materials
Abstract
The invention provides a self-heating ash-free discharge electrode and a preparation method thereof, the discharge electrode comprises a support rod and discharge thorns, a plurality of discharge thorns are arranged at two sides of the support rod along the length direction at intervals, the discharge thorns adopt a three-layer composite structure, the three-layer composite structure comprises a self-heating area arranged on the middle layer and ash-free areas respectively arranged on the upper surface and the lower surface of the self-heating area, the self-heating area is made of metal fiber and carbon fiber composite materials, the ash-free areas are made of stainless steel materials, corona discharge areas are further arranged at the tip discharge points of the discharge thorns, and the corona discharge areas are made of tungsten and rare earth metal oxide composite materials. The surface of the discharge electrode is not easy to accumulate ash and corrode, is convenient to process, can be produced in batches, is suitable for reforming the existing electric dust remover, and has good adaptability.
Description
[ field of technology ]
The invention relates to the technical field of flue gas pollutant treatment, in particular to a self-heating discharge electrode free of dust adhesion and a preparation method thereof.
[ background Art ]
Electric dust removal is one of the mainstream technologies of dust removal in the flue gas field, and the basic principle is that corona discharge charges particles, and dust is collected under the action of an electric field force, so that strengthening the electric field charge is very important for improving the electric dust removal performance. Corona discharge of an electric dust collector is not uniform, the structures of a discharge electrode and a dust collecting electrode have great influence on electric dust collection efficiency, and various discharge electrode structures have been proposed, including improvements of voltage, polarity, structural forms and the like. Hao Jiming and the like explore a simulation calculation method of electric parameters of tubular barbed corona electrodes of an electric precipitator, develop novel discharge electrodes in soil house liking of the Japanese Sanpa industry and the like to ensure that the current density is uniformly distributed, and improve the electric precipitation efficiency to a certain extent.
In order to reduce the dust deposit on the surface of the discharge electrode, the conventional electric dust remover generally adopts 304 or 316 stainless steel materials to improve the smoothness of the surface of the discharge electrode, or improves the rapping force of rapping and ash removal, reduces the rapping period and the like, and also proposes methods of reducing the voltage of a power supply during rapping, improving the ash removal efficiency by reducing the voltage and the like. In addition, the invention patent of application number CN202111267761.X proposes that a heating mechanism is arranged in a discharge electrode supporting tube, so that the temperature of the discharge electrode is increased, the dust humidity is reduced, the adhesiveness is reduced, and the surface ash adhering performance is reduced through an organic coating. The charge breaks through the surface of the cathode and has a work function, which has an important influence on the cathode discharge performance. WebneltA finds that the work function of the oxide cathode is very low, with high current discharge characteristics. The electric dust remover has the problems that the discharge electrode is easy to deposit dust and corrode under the environment with high water content and high sulfur content in the flue gas, such as flue gas working conditions of sludge blending combustion, a papermaking alkali furnace, a steel sintering machine head and the like, so that the corona discharge efficiency of the discharge electrode is low and even can not be discharged, and the electric dust removal efficiency is reduced.
The existing discharge electrode has the following defects:
1. the discharge electrode is prone to dust accumulation and corrosion, resulting in low corona discharge efficiency.
2. The discharge electrode has more serious problems of dust accumulation and corrosion in the environment with high water content and sulfur content such as sludge blending combustion, alkali furnace for paper making, steel sintering machine head and the like.
3. The corona discharge has poor uniformity and low energy consumption utilization rate.
4. Part of the novel polar line has a complex structure and high cost.
[ invention ]
The invention aims to solve the problems in the prior art, and provides a self-heating non-ash-sticking discharge electrode and a preparation method thereof.
In order to achieve the above purpose, the invention provides a self-heating ash-free discharge electrode, which comprises a support rod and discharge thorns, wherein a plurality of discharge thorns are arranged on two sides of the support rod at intervals along the length direction, the discharge thorns adopt a three-layer composite structure, the three-layer composite structure comprises a self-heating area arranged on the middle layer and ash-free areas respectively arranged on the upper surface and the lower surface of the self-heating area, the self-heating area is made of metal fiber and carbon fiber composite materials, the ash-free areas are made of stainless steel materials, corona discharge areas are further arranged at the point discharge points of the discharge thorns, and the corona discharge areas are made of tungsten and rare earth metal oxide composite materials.
Preferably, the corona discharge region comprises: 70-80% of tungsten metal, W-ThO 2 0-8% of W-CeO 2 0-5% of W-MgO, 0-9% of W-La 2 O 3 0-3% of W-ZrO 2 0-5% of W-Y 2 O 3 The content is 0-8%.
Preferably, the length of the corona discharge zone is 1-3mm.
Preferably, the surface of the non-dust-sticking area is provided with a physical non-sticking layer.
Preferably, the physical non-adhesive layer is a micron-sized rough surface, and the hardness of the surface layer of the rough surface is HV 500-1000, more preferably HV 500-800.
Preferably, the thickness of the self-heating area 21 is 0.35-0.65mm, and the thickness of the non-dust-sticking area 22 is 0.1-0.12mm.
The invention also provides a preparation method of the self-heating non-ash-sticking discharge electrode, which comprises the following steps of:
s1.1, manufacturing a non-dust-sticking area to form a non-dust-sticking area sheet, comprising the following steps of:
a. material selection and sand blasting: selecting a stainless steel plate, presetting the shape, and spraying an abrasive to the surface of the stainless steel plate body to form a rough surface on the surface of the stainless steel plate;
b. surface treatment: performing surface treatment on the stainless steel plate to form an oxide film;
c. polishing: mechanically polishing the surface of the stainless steel plate;
d. hardening step: heating to form a surface hardening layer;
e. oxidation procedure: performing oxidation treatment to form a nanoscale oxide film on the rough surface;
s1.2, manufacturing a self-heating area to form a self-heating area sheet: the metal fiber and the carbon fiber are manufactured into a metal sheet with the thickness of 0.35-0.65mm, and the metal sheet is preset in shape.
S1.3, compression molding: placing the sheet of the spontaneous heating area between two sheets of the non-dust-sticking area for compression molding to form a three-layer composite structure of discharge thorns, wherein the sheets are bonded by adopting metal glue;
s1.4, manufacturing a corona discharge region: and (3) melting the tungsten and rare earth metal oxide composite material at a high temperature, adhering the tungsten and rare earth metal oxide composite material to the discharge point position of the discharge thorn tip, and extruding the tungsten and rare earth metal oxide composite material out of the tip through mechanical pressing equipment after solidification to form a corona discharge region.
Preferably, in the step a, a stainless steel plate with the thickness of 0.1-0.12mm is selected, and a micron-sized rough surface is formed on the surface of the stainless steel plate through an abrasive.
Preferably, in the step d, the surface hardening layer is formed by hardening by a secondary heating method, wherein the surface hardness reaches HV 500-1000 by heat treatment at 600-650 ℃ for 3-6 hours, and then the surface hardening layer is formed by heat treatment at 450-600 ℃ for 5-10 hours.
Preferably, the thickness of the surface hardening layer is 6 to 15 micrometers.
The invention has the beneficial effects that:
1. the discharge electrode is not condensed by heating the surface temperature of the electrode, and the humidity of ash is low, so that the surface of the discharge electrode is not easy to accumulate ash and corrode. The problems of dust accumulation and serious corrosion of the discharge electrode in the environments with high water content and sulfur content such as sludge blending combustion, alkali furnace for paper making, steel sintering machine head and the like are avoided.
2. The corona discharge uniformity is good, and the energy consumption utilization rate is high.
3. The processing is simple, the batch high-quality production can be realized through the profiling equipment, the cost is low, and the quality is good.
4. Is suitable for reforming the existing electric dust collector and has good adaptability.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a self-heating ash-free discharge electrode according to the present invention;
FIG. 2 is a schematic cross-sectional view of a self-heating ash-free discharge electrode according to the present invention;
FIG. 3 is a schematic diagram of a self-heating ash-free discharge electrode discharge spike according to the present invention;
FIG. 4 is a schematic cross-sectional view of a discharge spike of a self-heating non-ash-stick discharge electrode according to the present invention.
[ detailed description ] of the invention
Referring to fig. 1 to 4, the self-heating ash-free discharge electrode of the invention comprises a support rod 1 and discharge thorns 2, wherein a plurality of discharge thorns 2 are arranged at two sides of the support rod 1 along the length direction at intervals, the discharge thorns 2 adopt a three-layer composite structure, the three-layer composite structure comprises a self-heating area 21 arranged on the middle layer and ash-free areas 22 respectively arranged on the upper surface and the lower surface of the self-heating area 21, the self-heating area 21 is made of metal fiber and carbon fiber composite materials, the ash-free areas 22 are made of stainless steel materials, corona discharge areas 23 are further arranged at the point discharge points of the discharge thorns 2, and the corona discharge areas 23 are made of tungsten and rare earth metal oxide composite materials.
In the corona discharge process of the discharge electrode, current flows through the tip of the discharge electrode and respectively flows through the support rod 1, the self-heating area 21 and the corona discharge area 22 of the discharge electrode, under the condition that the discharge electrode is continuously subjected to corona discharge, the self-heating area 21 heats under the action of the current, and then the heat conduction among metals improves the temperature difference between the whole discharge electrode and the smoke environment, SO that the moisture and SO in the smoke are avoided 3 The condensed water is adsorbed on the surface of the discharge electrode, so that the corrosion resistance and the ash-free performance of the discharge electrode are improved.
Further, the materials used for the corona discharge region 23 include: 70-80% of tungsten metal, W-ThO 2 0-8% of W-CeO 2 0-5% of W-MgO, 0-9% of W-La 2 O 3 0-3% of W-ZrO 2 0-5% of W-Y 2 O 3 The content is 0-8%. Wherein, the ingredients of the tungsten and rare earth metal oxide composite material are set according to the flue gas working condition. Among the numerous thermionic emission materials, tungsten materials have the characteristics of high melting point, low vapor pressure and low work function (4.5 eV), and a small amount of ThO is added into pure tungsten 2 The work function can be reduced, and the emission efficiency can be effectively improved. In the invention, tungsten is taken as a substrate, and ZrO is added 2 MgO, rare earth oxide (La) 2 O 3 、Y 2 O 3 、CeO 2 And composite oxides thereof), and the like, the rare earth oxide is used as an active substance, the work function of the material is reduced, the thermionic emission capability of the material is improved, and the high-melting-point oxide composite material has excellent high-temperature resistance, so that the corona discharge material of the discharge electrode of the electric dust collector of the high-current-density electron emitter taking the rare earth added tungsten as a substrate is developed.
Further, the length of the corona discharge zone 23 is 1-3mm. Because the corona discharge is tip discharge, when the curvature reaches a certain degree, the corona discharge phenomenon occurs under the condition of corresponding high potential difference, so that positive and negative charges are generated by air ionization, and a material with lower work function is needed to be adopted in a corona discharge area, so that the discharge efficiency is improved. Meanwhile, too long a length of the corona discharge region 23 will cause an increase in the amount of the special material to be used, thereby increasing the cost. Tests show that the arrangement of the corona discharge zone 23 with a length of 1-3mm ensures coverage of the corona discharge zone and is relatively low in cost.
Further, the surface of the non-dust-sticking region 22 has a physical non-sticking layer. In this embodiment, the physical non-adhesive layer is a micron-sized rough surface, and the hardness of the surface layer of the rough surface is HV 500-1000.
Further, the thickness of the self-heating area 21 is 0.35-0.65mm, and the thickness of the non-dust-sticking area 22 is 0.1-0.12mm. The device compares the manufacturing cost, the material cost, the loss of the ash-free layer and the heating effect of the self-heating area, and selects the optimal device.
Further, the metal fiber: the carbon fiber is 2-3:18-19. The metal fiber comprises nickel chromium: tungsten molybdenum, wherein nickel chromium: tungsten molybdenum is 5-12:3-8. The heating speed is higher, and the electrothermal conversion rate can reach more than 95%.
Current steering arrangement: by setting the material and thickness of the non-dust-sticking area, the resistance of the non-dust-sticking area is improved, so that the current flows along the flowing direction of the support rod, the self-heating area and the corona discharge area, and the self-heating area is ensured to heat by flowing the current.
Further, referring to fig. 1 and 2, the support bar 1 includes a middle tube and support wings 110 symmetrically disposed at both sides of the middle tube, and the discharge thorns 2 are mounted on the support wings 110 and are disposed in a staggered manner. In this embodiment, the support rod 1 is formed by welding or riveting two symmetrically arranged half tube plates 11, and two ends of each half tube plate 11 are provided with support wings 110.
The invention relates to a preparation method of a self-heating non-ash-sticking discharge electrode, which comprises the following steps:
s1, manufacturing a discharge thorn 2:
s1.1, manufacturing the non-dust-sticking area 22 to form a sheet of the non-dust-sticking area 22, comprising the following steps:
f. material selection and sand blasting: selecting a stainless steel plate with the thickness of 0.1-0.12mm, and presetting a shape to reduce the amount of waste; spraying abrasive material to the surface of the stainless steel plate body to form micron-sized rough surface on the surface of the stainless steel plate
g. Surface treatment: carrying out surface treatment on the stainless steel plate to form an oxide film with a nanoscale rough porous structure;
h. polishing: mechanically polishing the surface of the stainless steel plate;
i. hardening step: the surface hardening layer with the hardness of HV 500-800 and the thickness of 6-15 micrometers is formed by heat treatment for 3-6 hours at 600-650 ℃ and the surface hardness of HV 500-1000 and then heat treatment for 5-10 hours at 450-600 ℃.
j. Oxidation procedure: and (3) performing oxidation treatment to form a nanoscale oxide film on the rough surface.
S1.2, making the self-heating area 21 to form a sheet of the self-heating area 21: the metal fiber and the carbon fiber are made into a metal sheet with the thickness of 0.35-0.65mm, and the metal sheet is preset in shape to reduce the amount of waste.
S1.3, compression molding: the sheet of the self-heating area 21 prepared in the step S1.2 is placed between the sheets of the non-dust-sticky area 22 prepared in the step S1.1 (3 layers are spliced according to the diagram shown in fig. 4), the layers are bonded by adopting metal glue, and the layers are pressed into a whole by setting a certain recess on a molding press, so that the three-layer composite structure of the discharge thorn 2 is formed.
S1.4, making a corona discharge zone 23: the tungsten and rare earth metal oxide composite material is melted at high temperature, and can be adhered to the discharge point position of the tip end of the discharge thorn 2 through mechanical automatic equipment, and after being solidified to a certain degree (through temperature control), the composite material is pressed out of the tip end through mechanical pressing equipment to form a corona discharge region 23.
S2, manufacturing a supporting rod 1:
the sheet material with the thickness of 0.7-0.8mm and the base material of SPCC is pressed into a half tube plate by a pressing machine, the two half tube plates are symmetrically spliced into a round tube, and the two half tube plates are integrally spliced by laser welding or pressing at the joint of two ends.
S3, manufacturing a discharge electrode:
and (3) welding the discharge thorn 2 manufactured in the step (S1) to the support rod 1 manufactured in the step (S2) through laser, wherein the welding points are about 2 points which are flush.
Because the volume for manufacturing the discharge thorns is small, the weight is light, and the batch industrialized production efficiency is high, the method has the advantages of high precision and low manufacturing cost. In order to reduce the cost, the support rod is not provided with a self-heating area, and the self-heating area is only arranged on the discharge thorns, so that the discharge thorns are only required to be pressed and formed during manufacturing, the processing amount is small, the mass production can be realized, and then the discharge thorns are welded on the support rod.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (10)
1. The utility model provides a self-heating is not stained with grey discharge electrode, includes bracing piece (1) and discharge thorn (2), the both sides of bracing piece (1) are provided with a plurality of discharge thorn (2) along length direction interval, its characterized in that: the discharge thorn (2) adopts three-layer composite structure, including setting up in the spontaneous heating area (21) in intermediate level to and set up respectively in spontaneous heating area (21) upper and lower surface's non-dust area (22), the material of spontaneous heating area (21) adopts metal fiber and carbon fiber combined material, non-dust area (22) adopt stainless steel material, the tip discharge point department of discharge thorn (2) still is equipped with corona discharge area (23), corona discharge area (23) adopt tungsten and rare earth metal oxide combined material.
2. A self-heating ash-free discharge electrode as defined in claim 1, wherein: the corona discharge zone (23) is made of materials comprising: 70-80% of tungsten metal, W-ThO 2 0-8% of W-CeO 2 0-5% of W-MgO, 0-9% of W-La 2 O 3 0-3% of W-ZrO 2 0-5% of W-Y 2 O 3 The content is 0-8%.
3. A self-heating ash-free discharge electrode as defined in claim 1, wherein: the length of the corona discharge zone (23) is 1-3mm.
4. A self-heating ash-free discharge electrode as defined in claim 1, wherein: the surface of the non-dust-sticking area (22) is provided with a physical non-sticking layer.
5. A self-heating ash-free discharge electrode as defined in claim 4, wherein: the physical non-adhesive layer is a micron-sized rough surface, and the hardness of the surface layer of the rough surface is HV 500-1000.
6. A self-heating ash-free discharge electrode as defined in claim 1, wherein: the thickness of the spontaneous heating area (21) is 0.35-0.65mm, and the thickness of the ash-free area (22) is 0.1-0.12mm.
7. A method for manufacturing a self-heating non-ash-sticking discharge electrode according to any one of claims 1 to 6, welding a shaped discharge thorn (2) with a support rod (1) to form a discharge electrode, characterized in that: the preparation method of the discharge thorn (2) comprises the following steps:
s1.1, manufacturing a dust-free area (22) to form a sheet of the dust-free area (22), comprising the following steps:
a. material selection and sand blasting: selecting a stainless steel plate, presetting the shape, and spraying an abrasive to the surface of the stainless steel plate body to form a rough surface on the surface of the stainless steel plate;
b. surface treatment: performing surface treatment on the stainless steel plate to form an oxide film;
c. polishing: mechanically polishing the surface of the stainless steel plate;
d. hardening step: heating to form a surface hardening layer;
e. oxidation procedure: performing oxidation treatment to form a nanoscale oxide film on the rough surface;
s1.2, manufacturing a self-heating area (21) to form a sheet of the self-heating area (21): manufacturing metal fibers and carbon fibers into metal sheets with the thickness of 0.35-0.65mm, and presetting the shapes;
s1.3, compression molding: placing the sheet of the spontaneous heating area (21) between the sheets of the two non-dust-sticking areas (22) for compression molding to form a three-layer composite structure of the discharge thorn (2), wherein the sheets are bonded by adopting metal glue;
s1.4, manufacturing a corona discharge region (23): and (3) melting the tungsten and rare earth metal oxide composite material at a high temperature, adhering the tungsten and rare earth metal oxide composite material to the discharge point position of the tip of the discharge thorn (2), and extruding the tungsten and rare earth metal oxide composite material out of the tip through mechanical pressing equipment after solidification to form a corona discharge region (23).
8. The method for preparing the self-heating non-ash-sticking discharge electrode according to claim 7, wherein the method comprises the following steps: in the step a, a stainless steel plate with the thickness of 0.1-0.12mm is selected, and a micron-sized rough surface is formed on the surface of the stainless steel plate through an abrasive.
9. The method for preparing the self-heating non-ash-sticking discharge electrode according to claim 7, wherein the method comprises the following steps: in the step d, hardening by adopting a secondary heating mode, firstly, heat treating for 3-6 hours at 600-650 ℃, wherein the surface hardness reaches HV 500-1000, and then heat treating for 5-10 hours at 450-600 ℃ to form a surface hardening layer with the hardness HV 500-800.
10. The method for preparing the self-heating non-ash-sticking discharge electrode according to claim 9, wherein the method comprises the following steps: the thickness of the surface hardening layer is 6-15 micrometers.
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