AU2021437024B2 - Electron emitter and preparation method, and dust charging device comprising electron emitter - Google Patents
Electron emitter and preparation method, and dust charging device comprising electron emitter Download PDFInfo
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- AU2021437024B2 AU2021437024B2 AU2021437024A AU2021437024A AU2021437024B2 AU 2021437024 B2 AU2021437024 B2 AU 2021437024B2 AU 2021437024 A AU2021437024 A AU 2021437024A AU 2021437024 A AU2021437024 A AU 2021437024A AU 2021437024 B2 AU2021437024 B2 AU 2021437024B2
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- 239000000428 dust Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 9
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 20
- 239000010937 tungsten Substances 0.000 claims abstract description 20
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 12
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims abstract description 8
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- XAYGUHUYDMLJJV-UHFFFAOYSA-Z decaazanium;dioxido(dioxo)tungsten;hydron;trioxotungsten Chemical compound [H+].[H+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O XAYGUHUYDMLJJV-UHFFFAOYSA-Z 0.000 claims abstract description 4
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 3
- 239000000779 smoke Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004581 coalescence Methods 0.000 abstract description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 15
- 150000002910 rare earth metals Chemical class 0.000 description 14
- 239000002245 particle Substances 0.000 description 9
- 230000005684 electric field Effects 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000003574 free electron Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Landscapes
- Electrostatic Separation (AREA)
Abstract
Disclosed is an electron emitter. The electron emitter is conical and includes 2 wt%-3
wt% of ternary rare earth oxide and the balance tungsten, and the ternary rare earth oxide
includes, in percent by mass, 15 wt%-20 wt% of CeO 2, 15 wt%-25 wt% of La203, and the
balance Y 2 03 . Further disclosed is a preparation method for an electron emitter. The
preparation method includes: doping ammonium paratungstate with an aqueous solution of
cerium nitrate, lanthanum nitrate, and yttrium nitrate, drying, reducing at a large temperature
gradient, to prepare tungsten powder, and performing mixing, profiling, presintering, vertical
melting sintering, and plastic processing, to prepare the electron emitter. Further disclosed is a
dust charging device. The dust charging device includes a housing, the housing being
grounded, a discharge cathode being arranged in the housing, and the discharge cathode being
mace-shaped. The present disclosure can work efficiently and stably in high-temperature,
normal-temperature, and medium-low-temperature environments, increase the charging
quantity of fine dust, and improve electrostatic coalescence, and the electric collection
efficiency.
Description
TECHNICAL FIELD The present disclosure relates to a smoke purification device and a preparation method, and in particular to an electron emitter and a preparation method , and a dust charging device comprising the electron emitter.
In the fields of electric power, metallurgy, chemical engineering, etc. at home and abroad, smoke purification is increasingly highly-focused, and the removal of fine particles is difficult. The electrostatic dust removal technology features the high dust removal efficiency, small resistance loss, large processing gas flow, wide application range, etc., and thus has been widely applied to the fields of ventilation dust removal, smoke purification, etc. However, owing to the limitation in the working voltage and the cathode discharge intensity, although the traditional electrostatic dust remover can remove large dust particles thoroughly, the removal efficiency of fine particles, especially PM2.5, is low. In order to improve the purification effect on the fine dust, firstly, it is necessary to enhance the discharge performance of the cathode of the electrostatic dust remover, thereby increasing the current density of the charged area, so as to increase the charging quantity of the fine dust; and secondly, it is necessary to perform heteropolar charging on the fine dust (part of which is charged with positive charge, and the rest of which is charged with negative charge), so as to enlarge the dust through electrostatic aggregation. In recent years, people apply the high-voltage pulse power supply instead of the power-frequency or high-frequency power supply of the traditional electrostatic dust remover. Since the pulse power supply uses the narrow pulse high voltage in a short time, the pulse discharge can produce the high-density and low-temperature plasma, thus improving the charging effect of dust particles. However, the existing discharge cathode is made of the common metal or alloy materials (such as stainless steel or titanium alloy, etc.). Owing to its high surface work function (over 4 ev), it is too difficult for internal free electrons to overcome the surface constraints and to be emitted out, thereby affecting the discharge performance of the cathode. In view of this, Nanjing Normal University and Beijing University of Technology have already applied the powder metallurgy technology to prepare the tungsten based functional composite (rare earth tungsten) added with rare earth oxide. The surface of the rare earth tungsten has the low work function (3 ev or so), so that under a certain external voltage or after heating to a certain temperature, free electrons can be emitted out, to charge the dust. Currently, the rare earth tungsten cathode is only applied to the high-temperature direct-current power supply electrostatic dust removal technology. However, in a normal-temperature or medium-low-temperature environment, since the direct-current power supply is used in the prior art, and the cathode is of the rare earth tungsten round rod structure, the gas has the high initial discharge voltage, and the difficulty in maintaining the stable and high-strength discharge process, and PM2.5 cannot be trapped efficiently.
SUMMARY Objective of the invention: in order to overcome the defects in the prior art, an objective of the present disclosure is to provide an electron emitter with an obviously-reduced work function and good gas discharge performance. Another objective of the present disclosure is to provide a simple and convenient preparation method for an electron emitter. Still another objective of the present disclosure is to provide a dust charging device capable of promoting heteropolar charging on fine dust. Technical solution: the electron emitter of the present disclosure is conical and includes 2 wt%- 3 wt% of ternary rare earth oxide and the balance tungsten, the ternary rare earth oxide including, in percent by mass: 15 wt%-20 wt% of CeO 2 , 15 wt%-25 wt% of La 20 3, and the balance Y 2 0 3 . The work function of the electron emitter is reduced to 2.74 ev, which is reduced by over 30% compared with a common metal cathode made of stainless steel, titanium alloy or the like, a barbed wire, a sawtooth wire, a needled wire, etc. of an existing corona type electrostatic dust remover, and is reduced by 10% or so compared with a rare earth tungsten cathode in an existing thermionic emission-type particle charging device, thereby obviously enhancing electron emission of the cathode and improving the gas discharge performance. A ternary rare earth tungsten material has a low work function, and good wear resistance and corrosion resistance, and does not tend to be damaged in a smoke environment .
The preparation method for an electron emitter includes: doping ammonium paratungstate with an aqueous solution of cerium nitrate, lanthanum nitrate, and yttrium nitrate, drying, reducing at a large temperature gradient, to prepare tungsten powder, and performing mixing, profiling, presintering, vertical melting sintering, and plastic processing, to prepare the electron emitter. Further, the large temperature gradient is 240°C-960°C. A temperature of presintering is 1150°C-1950°C. A dust charging device includes a housing, the housing being grounded, and used as an anode of a discharge area, so that an external high-voltage pulse electric field is formed between a discharge cathode and the anode; the discharge cathode is arranged in the housing, mace-shaped, and connected to a high-voltage pulse power supply through an insulating ceramic sleeve, so that high-voltage electrical insulation is realized; and the discharge cathode includes electron emitters and a metal support rod, and the electron emitters being conical. Further, the electron emitters are uniformly arranged along the metal support rod at intervals. Each electron emitter has a taper of 1:2-4:5, and a cone spacing of 15 mm-25 mm. Therefore, a local high field intensity is generated, to make source electrons emitted by an emitting electrode further obtain higher energy, thereby improving a smoke discharge intensity. Smoke flows through the discharge area longitudinally, to fully charge dust therein. Further, each electron emitter includes 2 wt%-3 wt% of ternary rare earth oxide and the balance tungsten. The ternary rare earth oxide includes, in percent by mass, 15 wt%-20 wt% of CeO 2 , 15 wt%-25 wt% of La 20 3 , and the balance Y 2 0 3 .
Further, the housing is provided with a smoke inlet and a smoke outlet. Working principle: the ternary rare earth tungsten composite is made into the conical electron emitters which are uniformly embedded on one metal support rod, to construct the mace-shaped discharge cathode. Under the action of the external high-voltage pulse electric field, the mace-shaped discharge cathode may stably emit the source electrons with a high density. These source electrons have high initial kinetic energy, and then obtain more energy from the external pulse electric field, to accelerate and collide with smoke molecules, and to make them discharge strongly. Therefore, a phenomenon similar to a "diffuse discharge" is formed, and large-area uniform and low-temperature plasma is generated, thus having high-density free electrons, negative ions, and positive ions in an entire electric field channel, which is conducive to full and uniform heteropolar charging on fine dust particles. The dust flows through the discharge area along with the smoke longitudinally, part of which collides with the free electrons and the negative ions and traps them to become particles with negative charges, and the rest of which collides with the positive ions and traps them to become particles with positive charges. Therefore, a smoke particle group generates heteropolar charging, thereby obviously increasing the heteropolar charging quantity of the fine dust, and improving electrostatic coalescence of the dust and collection efficiency of the electric field. Beneficial effects: compared with the prior art, the present disclosure has the remarkable features as follows: 1. The present disclosure is suitable for a high-temperature environment, and may also work in normal-temperature and medium-low-temperature environments efficiently and stably. By forming the phenomenon similar to a "diffuse discharge", the large-area uniform and low-temperature plasma is generated, thus having the high-density free electrons, negative ions, and positive ions in the entire electric field channel. In addition, the present disclosure may make the dust particle group generate heteropolar charging, part of which is charged with the positive charges, and the rest of which is charged with the negative charges, thus obviously increasing the charging quantity of the fine dust, and improving the electrostatic coalescence and the collection efficiency of the electric field. 2. The work function of the prepared electron emitter made of the ternary rare earth tungsten composite is reduced to 2.74 ev, which is reduced by over 30% compared with the common metal cathode made of stainless steel, titanium alloy, or the like of the existing corona type electrostatic dust remover, and is reduced by 10% or so compared with the rare earth tungsten cathode in the existing thermionic emission type electrostatic dust remover, thereby obviously enhancing the electron emission of the cathode and the gas discharge performance. 3. The present disclosure features a simple structure, and a low energy consumption which is reduced by over 50% compared with direct-current corona discharge.
FIG. 1 is a structural schematic diagram of a discharge cathode 1 of the present disclosure; and FIG. 2 is a structural schematic diagram of the present disclosure.
As shown in FIG. 1, a discharge cathode 1 is mace-shaped and includes several electron emitters 11 and a metal support rod 12, and the electron emitters 11 are uniformly arranged along the metal support rod 12 at intervals. Each electron emitter is conical, with a taper of 1:2-4:5, and a cone spacing of 15 mm-25 mm. The metal support rod 12 is made of a stainless steel material. Each electron emitter 11 includes 2 wt%-3 wt% of ternary rare earth oxide and the balance tungsten. The ternary rare earth oxide includes, in percent by mass, 15 wt%-20 wt% of CeO 2 , 15 wt%-25 wt% of La2 0 3 , and the balance Y 2 0 3 . A work function of the electron emitter 11 is reduced to 2.74 ev, which is reduced by over 30% compared with a common metal cathode made of stainless steel, titanium alloy, or the like, a barbed wire, a sawtooth wire, a needled wire, etc. of an existing corona type electrostatic dust remover, and is reduced by 10% or so compared with a rare earth tungsten cathode in an existing thermionic emission type particle charging device, thereby obviously enhancing electron emission of the cathode and gas discharge performance. A ternary rare earth tungsten material has a low work function, and good wear resistance and corrosion resistance, and does not tend to be damaged in a smoke environment with dust. A preparation method for an electron emitter 11 includes the following steps: dope ammonium paratungstate with an aqueous solution of cerium nitrate, lanthanum nitrate, and yttrium nitrate, dry, reduce at a large temperature gradient in two stages at 240°C-960°C, to prepare tungsten powder, and perform mixing, profiling, presintering at 1150°C-1950°C, vertical melting sintering, and plastic processing, to prepare the electron emitter 11. If a reduction temperature is not in a range of 240°C-960°C, it is difficult to form fine particles of the rare earth oxide and uniform dispersion thereof. If a presintering temperature is not in a range of 1150°C-1950°C, a billet will have a low density, with rare earth elements therein distributed unevenly. All of the above causes a decrease in an electron emission capacity of the electron emitter 11. As shown in FIG. 2, a housing 2 of a dust charging device is grounded. The discharge cathode 1 shown in FIG. 1 is arranged in the housing 2 and connected to a high-voltage pulse power supply 4 through an insulating ceramic sleeve 3. The conical electron emitters 11 are uniformly embedded on the metal support rod 12, to form the mace-shaped discharge cathode 1, and the mace-shaped discharge cathode 1 is connected to a negative electrode of the high-voltage pulse power supply 4. The housing 2 is further provided with a smoke inlet 5 and a smoke outlet 6, which are located at a lower portion and an upper portion of the housing 2, respectively. Conical low-work-function ternary rare earth tungsten functional composites for emitting electrons are embedded on a common metal (such as stainless steel) support rod, to form the mace-shaped discharge cathode 1. Therefore, firstly, the expensive ternary rare earth tungsten functional composites are saved on as much as possible. Secondly, field electron emission performance of the low-work-function ternary rare earth tungsten functional composites is fully exerted. Thirdly, the discharge performance of smoke is enhanced under the coupling action of electron emission and an external high-voltage pulse electric field, thereby forming a similar "diffuse discharge", generating large-area uniform and low-temperature plasma, and promoting heteropolar charging on fine dust. Performance test According to process parameter in Table 1 below, ten devices are set, and peak current densities are tested, respectively. It can be seen that pulse power supply parameters (such as a rising edge, a pulse frequency, and a peak voltage) and structures (such as the taper and the cone spacing of the electron emitter 11) of the discharge cathode 1 affect dust charging performance. When the rising edge, the pulse frequency, and the peak voltage of the high-voltage pulse power supply 4 are 800 ns, 50 Hz, and 60.8 KV, respectively, and the taper and the cone spacing of the electron emitter 11 of the discharge cathode 1 are 4:5 and 20 mm, respectively, a discharge current density is maximized (up to 3.24 mA/cm2), and the best dust charge effect is obtained. Table 1 Performance test of electron emitters 11 with different tapers and cone spacings High-voltage pulse power supply Structures of discharge Peakcurrent Test parameters cathode density Example Rising edge Frequenc Peak voltage Taper Cone spacing (mA/cm2 (ns) y (Hz) (KV) (mm) 1 800 50 60.8 4:5 20 3.24 2 800 50 60.8 4:5 15 3.11 3 800 50 60.8 4:5 25 2.92 4 800 50 60.8 1:2 20 2.36 5 800 100 57.6 4:5 20 3.07 6 600 200 62.4 4:5 20 3.08 7 600 400 56 4:5 20 2.80 8 800 500 58.4 4:5 20 2.83 9 800 200 36.4 4:5 20 1.35 10 600 400 28.8 4:5 20 1.0
Claims (6)
1. A dust charging device, comprising a housing (2), the housing (2) being grounded and used as an anode; a discharge cathode (1) being arranged in the housing (2), the discharge cathode (1) being mace-shaped and connected to a high-voltage pulse power supply (4) through an insulating ceramic sleeve (3); the discharge cathode (1) comprising electron emitters (11) and a metal support rod (12); and the electron emitters (11) being conical with a taper of 1:2-4:5 and a cone spacing of 15 mm-25 mm, and comprising 2 wt%-3 wt% of ternary rare earth oxide and the balance tungsten, and the ternary rare earth oxide comprising, in percent by mass, 15 wt%-20 wt% of CeO 2 , 15 wt%-25 wt% of La 20 3 , and the balance Y 2 0 3 ; and,
the high-voltage pulse power supply (4) being with rising edge of 600 ns or 800 ns, frequency of 50 Hz, 100 Hz, 200 Hz, 400 Hz or 500 Hz, and peak voltage of 60.8 KV, 57.6 KV, 62.4 KV, 56 KV, 58.4 KV, 36.4 KV or 28.8 KV.
2. The dust charging device according to claim 1, wherein, work function of the electron emitter (11) is reduced to 2.74 ev.
3. The dust charging device according to claim 1 or 2, wherein, the electron emitter (11) is prepared by the following method: doping ammonium paratungstate with an aqueous solution of cerium nitrate, lanthanum nitrate, and yttrium nitrate, drying, reducing at a large temperature gradient, to prepare tungsten powder, and performing mixing, profiling, presintering, vertical melting sintering, and plastic processing; wherein the large temperature gradient is 240°C-960°C.
4. The dust charging device according to claim 3, wherein, a temperature of the presintering is 1150°C-1950°C.
5. The dust charging device according to claim 1 or 2, wherein the electron emitters (11) are uniformly arranged along the metal support rod (12) at intervals.
6. The dust charging device according to claim 1 or 2, wherein the housing (2) is provided with a smoke inlet (5) and a smoke outlet (6).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958423.4A CN113649168B (en) | 2021-08-19 | 2021-08-19 | Electron emitter, manufacturing method thereof and dust charging device comprising electron emitter |
| CN202110958423.4 | 2021-08-19 | ||
| PCT/CN2021/114457 WO2023019615A1 (en) | 2021-08-19 | 2021-08-25 | Electron emitter and manufacturing method therefor, and dust charged device comprising said electron emitter |
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| AU2021437024A1 AU2021437024A1 (en) | 2023-03-09 |
| AU2021437024B2 true AU2021437024B2 (en) | 2024-03-28 |
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| CN (1) | CN113649168B (en) |
| AU (1) | AU2021437024B2 (en) |
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| CN113649168B (en) | 2022-12-06 |
| AU2021437024A1 (en) | 2023-03-09 |
| WO2023019615A1 (en) | 2023-02-23 |
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