Ultrafine powder collection device and system

Abstract

The invention relates to the field of powder production equipment, and provides an ultrafine powder collecting device and system. The ultrafine powder collecting device of the invention comprises an insulating end cover, a conductive cylinder, an electrode sheet group and a powder cleaning component. The conductive cylinder comprises an inner tube and an outer tube which are coaxially arranged. The top ends of the outer tube and the inner tube are both connected to the insulating end cover. The space between the inner tube and the outer tube forms an air inlet channel, which is connected to an air inlet, and the top end of the inner tube is connected to an air outlet. The electrode sheet group is movably arranged in the air inlet channel, and the electrode sheet group and the outer tube are respectively connected to the negative electrode and the positive electrode of a power supply, so that the powder can adhere to the inner wall of the outer tube in a power-on state. The powder cleaning component moves along the top end of the air inlet channel to the bottom end of the air inlet channel to remove the powder particles on the inner wall of the outer tube, so that the powder particles are collected from the bottom of the conductive cylinder, thereby improving the collection efficiency. In addition, the invention is not affected by corrosive gases and high-temperature gases, and realizes continuous production.

Description

Technical Field

[0001] The present invention relates to the technical field of powder production equipment, and particularly to an ultra-fine powder collection device and system. Background Art

[0002] With the rapid development of new material technologies, the demand for nano-scale and sub-micron ultra-fine powder materials is increasing day by day. Such as various powder materials of metal oxides, ceramics, carbon, metals, etc., which can be widely used in many fields such as new energy, microelectronics, semiconductors, and biomedicine. Spray drying and spray pyrolysis are important methods for preparing ultra-fine powders, and can produce powder materials with high uniformity and excellent morphology. The collection methods for such powders are usually cyclone separation collection and bag collection. Cyclone separation is generally suitable for collecting particles above 50 microns. As the particle size decreases, the collection rate of cyclone separation will become lower and lower. For sub-micron or nano-scale powders, the cyclone separation method can hardly collect them. The bag collection method can collect finer particles compared with cyclone collection, but for fine particles, the aperture of the bag also needs to be smaller, so the bag is easily blocked. At the same time, for the production process with corrosive gases and high-temperature gases, the bag has great limitations in corrosion resistance and temperature resistance. Summary of the Invention

[0003] The present invention provides an ultra-fine powder collection device and system, which has high temperature resistance and corrosion resistance and improves the collection efficiency.

[0004] In a first aspect, the present invention provides an ultra-fine powder collection device, including:

[0005] An insulating end cap provided with an air inlet and an air outlet;

[0006] A conductive cylinder body, the conductive cylinder body includes an inner tube and an outer tube arranged coaxially, the top ends of the outer tube and the inner tube are both connected to the insulating end cap, the space between the inner tube and the outer tube forms an air inlet channel, the air inlet channel is communicated with the air inlet, the top end of the inner tube is communicated with the air outlet; the bottom end of the inner tube is communicated with the air inlet channel;

[0007] An electrode plate group movably arranged in the air inlet channel, the electrode plate group and the outer tube are respectively connected to the negative electrode and the positive electrode of a power supply, and can make the powder adhere to the inner wall of the outer tube in the energized state;

[0008] The powder cleaning assembly is arranged in the air inlet passage. The powder cleaning assembly is connected to the electrode sheet group and is located above the electrode sheet group. The powder cleaning assembly has a powder cleaning state and a powder collecting state. In the powder collecting state, the powder cleaning assembly is located at the top end of the air inlet passage, and the electrode sheet group is electrified with the outer tube to collect powder. In the powder cleaning state, the electrode sheet group is powered off from the outer tube, and the powder cleaning assembly moves from the top end to the bottom end of the air inlet passage to scrape the powder on the inner wall of the outer tube and send it into the powder collecting container arranged at the bottom of the conductive cylinder body.

[0009] According to the ultra-fine powder collecting device provided by the present invention, it further includes a driving mechanism, and the driving mechanism includes:

[0010] A driving member is arranged outside the conductive cylinder body. The driving member is connected to the insulating end cover through a bracket. A connecting disc is arranged at the driving end of the driving member, and the connecting disc is parallel to the insulating end cover.

[0011] Guide rods, the top ends of multiple guide rods are vertically connected to the connecting disc, and the bottom end of each guide rod penetrates through the insulating end cover and extends into the air inlet passage to be connected to the powder cleaning assembly.

[0012] According to the ultra-fine powder collecting device provided by the present invention, the powder cleaning assembly includes:

[0013] An annular movable block, which is connected to the bottom end of the guide rod;

[0014] An annular clamping block is arranged at the bottom of the annular movable block, and the annular clamping block is connected to the annular movable block through bolts;

[0015] An annular scraping block is arranged between the annular movable block and the annular clamping block, and the outer side of the annular scraping block is attached to the inner wall of the outer tube.

[0016] According to the ultra-fine powder collecting device provided by the present invention, the outer diameter of the annular scraping block is larger than the outer diameters of the annular movable block and the annular clamping block, and the inner diameter of the annular movable block is smaller than the inner diameters of the annular clamping block and the annular scraping block.

[0017] According to the ultra-fine powder collecting device provided by the present invention, the electrode sheet group is sleeved on the inner tube and includes a plurality of annular electrode sheets. The plurality of annular electrode sheets are arranged at intervals along the length direction of the inner tube and are connected to each other through connecting rods. The top end of the connecting rod is connected to the bottom of the annular clamping block or the annular movable block.

[0018] According to the ultra-fine powder collecting device provided by the present invention, the outer edge of the annular electrode sheet is arranged in a serrated shape.

[0019] According to the ultrafine powder collection device provided by the present invention, a conical feed hopper is connected between the conductive cylinder body and the powder collection container. The flared end of the conical feed hopper is connected to the bottom end of the outer tube, and the tapered end of the conical feed hopper is connected to the inlet of the powder collection container.

[0020] According to the ultrafine powder collection device provided by the present invention, it further includes an exhaust gas treatment device, and the exhaust gas treatment device is connected to the air outlet through a pipeline.

[0021] According to the ultrafine powder collection device provided by the present invention, the driving member is any one of a cylinder, a hydraulic cylinder, and an electric cylinder.

[0022] In a second aspect, the present invention further provides an ultrafine powder collection system, including: an ultrasonic atomization device, a pyrolysis tube furnace, and the ultrafine powder collection device described in the first aspect. The ultrasonic atomization device is connected to the inlet of the pyrolysis furnace and is used to send the atomized droplets into the pyrolysis furnace through a carrier gas; the outlet of the pyrolysis furnace is connected to the air inlet of the ultrafine powder collection device and is used to send the carrier gas, the powder particles formed after the cracking reaction, and the reaction gas into the ultrafine powder collection device.

[0023] The ultrafine powder collection device provided by the present invention includes an insulating end cover, a conductive cylinder body, an electrode plate group, and a powder cleaning component. The conductive cylinder body includes an inner tube and an outer tube arranged coaxially. The top ends of the outer tube and the inner tube are both connected to the insulating end cover, so that the space between the outer tube and the inner tube serves as an air inlet channel and communicates with the air inlet of the insulating end cover. The cavity of the inner tube serves as an air outlet channel and communicates with the air outlet of the insulating end cover. An electrode plate group and a powder cleaning component that can move axially are arranged in the air inlet channel. In the powder collection state, the gas containing powder particles enters the air inlet channel from the air inlet and is ionized by the electrostatic field formed after the electrode plate group is energized with the outer tube. Under the action of the electric field force, the charged powder particles migrate to the inner wall of the outer tube. When the powder particles on the outer tube of the collector are adsorbed to a certain extent, the power supply is disconnected, the annular electrode plate stops power supply, and the powder cleaning component moves from the top end to the bottom end of the air inlet channel to remove the powder particles on the inner wall of the outer tube, so that the powder particles are collected from the bottom of the conductive cylinder body, improving the collection efficiency. Since the high-voltage electrostatic collection method is adopted, powder particles with smaller particle sizes can be collected. And because the conductive cylinder body is adopted, the ultrafine powder collection device of the present invention can be free from the influence of corrosive gases and high-temperature gases, realizing automatic and efficient removal of powder to the powder collection container and enabling continuous production.

[0024] The present invention further provides an ultrafine powder collection system, including an ultrasonic atomization device, a pyrolysis tube furnace, and the ultrafine powder collection device described in the first aspect. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought by the above-mentioned ultrafine powder collection device, and will not be elaborated here. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the ultra-fine powder collection device provided by the embodiment of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the ultra-fine powder collection device provided by the embodiment of the present invention in the powder collection state.

[0028] Figure 3 It is a schematic structural diagram of the ultra-fine powder collection device provided by the embodiment of the present invention in the powder cleaning state.

[0029] Figure 4 It is a partial structural schematic diagram of the powder cleaning component provided by the embodiment of the present invention.

[0030] Figure 5 It is a schematic connection structure diagram of the powder cleaning component and the electrode plate group provided by an embodiment of the present invention.

[0031] Figure 6 It is a schematic structural diagram of the annular electrode plate provided by an embodiment of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the ultra-fine powder collection system provided by an embodiment of the present invention.

[0033] Reference Numerals:

[0034] 1. Insulating end cap; 11. Air inlet; 12. Air outlet;

[0035] 2. Outer tube; 21. Air inlet channel; 3. Inner tube; 31. Air outlet channel;

[0036] 4. Powder cleaning component; 41. Annular movable block; 42. Annular clamping block; 43. Annular scraping block;

[0037] 5. Electrode plate group; 51. Annular electrode plate;

[0038] 6. Driving mechanism; 61. Driving part; 62. Bracket; 63. Connecting disc; 64. Guide rod;

[0039] 7. Conical feed hopper; 8. Powder collection container; 9. Waste gas treatment device.

[0040] 100. Ultrasonic atomization device; 200. Pyrolysis furnace. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts fall within the scope of protection of the present invention.

[0042] The following Figures 1 to 7 describes an ultrafine powder collection device and system provided in the embodiments of the present invention.

[0043] Referring Figures 1 to 3 , the ultrafine powder collection device provided in this embodiment, in the working state, sequentially includes from top to bottom: an insulating end cap 1, a conductive cylinder, a powder cleaning assembly 4, an electrode plate group 5, and a powder collection container 8.

[0044] Among them, the insulating end cap 1 is provided with an air inlet 11 and an air outlet 12.

[0045] The conductive cylinder includes an inner tube 3 and an outer tube 2 arranged coaxially. The conductive cylinder is made of a metal material, and can be made of stainless steel material, with good high-temperature resistance and corrosion resistance. The top ends of the outer tube 2 and the inner tube 3 are both connected to the insulating end cap 1. The space between the inner tube 3 and the outer tube 2 forms an air inlet passage 21. The air inlet passage 21 is communicated with the air inlet 11. Powder particles and gas enter the air inlet passage 21 through the air inlet 11. The gas is compressed air or an inert gas such as nitrogen. The top end of the inner tube 3 is communicated with the air outlet 12, and the bottom end of the inner tube 3 is communicated with the air inlet passage 21, so that the gas enters the inner tube 3 from the bottom end of the air inlet passage 21, and then is discharged through the air outlet 12 of the insulating end cap 1.

[0046] The electrode plate group 5 is movably arranged in the air inlet passage 21. The electrode plate group 5 and the outer tube 2 are respectively connected to the negative electrode and the positive electrode of the power supply. By discharging the annular electrode plate through the power supply, the powder particles are charged. Since the powder particles carry the same kind of electric charge, the dispersibility between the powder particles is enhanced, the particle agglomeration can be reduced, and the dispersibility of the powder particles is improved. When the power is on, the gas enters the air inlet passage 21. Since the powder particles in the gas are affected by the electric field force, the powder particles adhere to the inner wall of the outer tube 2.

[0047] The powder cleaning assembly 4 is arranged in the air inlet passage 21. The powder cleaning assembly 4 is connected to the electrode sheet group 5 and is located above the electrode sheet group. The powder cleaning assembly 4 has a powder cleaning state and a powder collecting state. In the powder collecting state, the powder cleaning assembly 4 is located at the top end of the air inlet passage 21, and the electrode sheet group 5 is energized with the outer tube 2 to collect the powder. In the powder cleaning state, the electrode sheet group 5 is de-energized from the outer tube 2, and the powder cleaning assembly 4 moves from the top end of the air inlet passage 21 to the bottom end of the air inlet passage 21, scraping the powder on the inner wall of the outer tube 2 and feeding it into the powder collecting container 8 arranged at the bottom of the conductive cylinder body.

[0048] The above power supply is a high-voltage power supply. In one embodiment, the above high-voltage power supply is a constant voltage and constant current power supply, with a voltage of 10 KV - 30 KV and a current not greater than 0.5 mA.

[0049] Compared with the prior art, the present invention first improves the structure of the conductive cylinder body, including an outer tube 2 and an inner tube 3 arranged coaxially, making the space between the outer tube 2 and the inner tube 3 serve as the air inlet passage 21 communicating with the air inlet 11 of the insulating end cover 1, and the cavity of the inner tube 3 serves as the air outlet passage 31. An axially movable electrode sheet group 5 and a powder cleaning assembly 4 are arranged in the air inlet passage 21. The reciprocating movement of the powder cleaning assembly 4 drives the electrode sheet group 5 to move simultaneously. In the powder collecting state, the gas containing powder particles enters the air inlet passage 21 from the air inlet 11. The powder particles are ionized by the electrode sheet group 5 and then charged. Subsequently, under the action of the electric field, the charged powder particles migrate to the inner wall of the powder collecting shell. The high-voltage power supply is disconnected, and the powder cleaning assembly 4 moves from the top end of the air inlet passage 21 to the bottom end of the air inlet passage 21 to remove the powder on the inner wall of the outer tube 2, so that the powder is collected from the bottom of the conductive cylinder body, improving the collection efficiency. This device is not affected by corrosive gases and high-temperature gases, realizes automatic removal of powder to the powder collecting container 8, and can be continuously produced.

[0050] The above insulating end cover 1 is hermetically connected to the inner tube 3. A groove can be opened in the center of the insulating end cover 1, and the inner tube 3 is embedded therein to improve the reliability of the hermetic connection.

[0051] Further, a conical guide hopper 7 is connected between the conductive cylinder body and the powder collecting container 8. The flared end of the conical guide hopper 7 is connected to the bottom end of the outer tube 2, and the narrowed end of the conical guide hopper 7 is connected to the inlet of the powder collecting container 8. By setting the conical guide hopper 7, the powder particles in the conductive cylinder body can be efficiently and quickly collected into the powder collecting container 8. Since the conductive cylinder body and the powder collecting container 8 are connected through the inclined surface of the conical guide hopper 7, good fluidity of the material can be ensured, and all the powder falls into the powder collecting container 8.

[0052] In this embodiment, a driving mechanism 6 is further included. The driving mechanism 6 is arranged outside the conductive cylinder body and includes a driving member 61, a bracket 62, a connecting disc 63, and a guide rod 64.

[0053] The driving member 61 is any one of a cylinder, a hydraulic cylinder and an electric cylinder, and includes a cylinder block and a telescopic rod. The driving member 61 is arranged outside the conductive cylinder body. The cylinder block of the driving member 61 is connected to the insulating end cover 1 through a bracket 62, and the cylinder block is perpendicular to the insulating end cover 1. A connecting disc 63 is connected to the end of the telescopic rod of the driving member 61. The connecting disc 63 is parallel to the insulating end cover 1. The tops of a plurality of guide rods 64 are perpendicularly connected to the connecting disc 63. At the same time, through holes with the same number and corresponding positions as the guide rods 64 are opened on the insulating end cover 1. Each guide rod 64 passes through the corresponding through hole, and the bottom end of the guide rod 64 extends into the air inlet passage 21 to be connected to the powder cleaning assembly 4.

[0054] With such a setting, by setting the driving member 61 to drive the guide rod 64 to perform telescopic movement, the powder cleaning assembly 4 and the electrode plate group 5 in the air inlet passage 21 are driven to move up and down, so as to achieve the effect of removing the powder on the inner wall of the outer tube 2 by the powder cleaning assembly 4. And the driving member 61 is arranged outside the conductive cylinder body, without occupying the space inside the conductive cylinder body.

[0055] The outer diameter of the above-mentioned guide rod 64 is adapted to the inner diameter of the through hole. A sealing ring can be arranged at the through hole to prevent gas leakage while ensuring the sliding connection between the guide rod 64 and the through hole.

[0056] Optionally, the through holes on the insulating end cover 1 are evenly distributed in a ring shape, and the through holes communicate with the air inlet passage 21 in the conductive cylinder body. At least three through holes are provided. Correspondingly, the guide rods 64 are also distributed in a ring shape on the connecting disc 63. With such a setting, through the uniform arrangement of a plurality of guide rods 64, the stability of the powder cleaning assembly 4 during movement is ensured.

[0057] Optionally, the connecting disc 63 and the plurality of guide rods 64 are fixedly connected, such as by welding, or can be detachably connected. By opening a plurality of connecting holes on the connecting disc 63, the tops of the plurality of guide rods 64 are inserted into the connecting holes, and the guide rods 64 are fixedly connected to the connecting disc 63 through bolts or connecting pins.

[0058] Refer to Figure 4 , in this embodiment, the powder cleaning assembly 4 is sleeved on the inner tube 3 and includes: an annular movable block 41, an annular clamping block 42 and an annular scraping block 43. The annular movable block 41 is connected to the bottom end of the guide rod 64; the annular clamping block 42 is arranged at the bottom of the annular movable block 41, and the annular clamping block 42 is connected to the annular movable block 41 through bolts; the annular scraping block 43 is arranged between the annular movable block 41 and the annular clamping block 42, and the outer side of the annular scraping block 43 is attached to the inner wall of the outer tube 2. Since the conductive cylinder body is made of metal, the annular scraping block 43 is made of a non-metal material such as rubber or ceramic, so as to remove the separated particles on the inner wall of the outer tube 2 during movement and will not scratch the inner wall of the outer tube 2.

[0059] With such a setting, the cleaning powder assembly 4 as a whole connected to the annular movable block 41 through the guide rod 64 reciprocates along the axial direction. Through the clamping action of the annular movable block 41 and the annular clamping block 42 on the annular scraping block 43, the annular scraping block 43 arranged between the two is fixed, achieving the effect of stable connection. Moreover, the annular clamping block 42 is connected to the annular movable block 41 by bolts, which also facilitates the disassembly and replacement of the annular scraping block 43.

[0060] Furthermore, the annular movable block 41, the annular clamping block 42, and the annular scraping block 43 are sleeved on the inner tube 3. The inner diameters of the annular movable block 41, the annular clamping block 42, and the annular scraping block 43 are all larger than the outer diameter of the inner tube 3, and they will not come into contact with the inner tube 3 during the movement.

[0061] In this embodiment, the outer diameter of the annular scraping block 43 is larger than the outer diameters of the annular movable block 41 and the annular clamping block 42, realizing the sliding contact of only the annular scraping block 43 with the inner wall of the outer tube 2. The inner diameter of the annular movable block 41 is smaller than the inner diameters of the annular clamping block 42 and the annular scraping block 43, realizing the installation of the annular clamping block 42 and the annular scraping block 43 on the annular movable block 41.

[0062] In one embodiment, the outer diameter of the annular movable block 41 can be the same as that of the annular clamping block 42, and the outer diameter of the annular scraping block 43 is larger than that of the annular movable block 41, so that only the outer side of the annular scraping block 43 fits against the inner wall of the outer tube 2, achieving the effect of scraping off the powder. The inner diameters of the annular clamping block 42 and the annular scraping block 43 are the same and larger than the inner diameter of the annular movable block 41. With such a setting, the part of the inner side of the bottom of the annular movable block 41 that is not covered by the annular scraping block 43 can be used to connect the electrode sheet group 5, and this also does not affect the disassembly and assembly of the annular clamping block 42.

[0063] Refer to Figure 5 , the electrode sheet group 5 is sleeved on the inner tube 3 and is located below the annular clamping block 42. The electrode sheet group 5 is connected to the bottom of the annular clamping block 42 or the annular movable block 41 through a connecting rod.

[0064] Furthermore, as Figure 5 shown, in order not to affect the disassembly and assembly of the annular scraping block 43, the electrode sheet group 5 is connected to the bottom of the annular movable block 41 through a connecting rod, that is, the connecting rod is connected to the part of the inner side of the annular movable block 41 that is not connected to the annular clamping block 42 and the annular scraping block 43.

[0065] Refer to Figure 5 , Figure 6 , in this embodiment, the electrode sheet group 5 includes a plurality of annular electrode sheets 51 arranged in layers. The plurality of annular electrode sheets 51 are arranged at intervals along the length direction of the inner tube 3 and are connected to each other through connecting rods. Among them, each annular electrode sheet 51 is a ring structure, and the outer edge of the annular electrode sheet 51 is serrated.

[0066] With such a setting, when the annular electrode sheet 51 is energized, it can discharge to the surroundings through the tips on the outer ring, improving the intensity of the electrostatic field, thereby enhancing the collection effect of the inner wall of the outer tube 2 on dust.

[0067] In this embodiment, an exhaust gas treatment device 9 is further provided. Since the gas may also be mixed with reaction gas (exhaust gas) generated during the preparation of powder particles, the exhaust gas treatment device 9 is connected to the air outlet 12 through a pipeline. Exemplarily, the exhaust gas treatment device 9 is mainly composed of a liquid container. When the reaction gas is an acidic gas, it is introduced into a container filled with an alkaline solution and neutralized by a gas washing method.

[0068] As Figure 7 shown, the embodiment of the present invention further provides an ultrafine powder collection system, including: an ultrasonic atomization device 100, a pyrolysis furnace 200, and the above-mentioned ultrafine powder collection device.

[0069] The derivation process of the beneficial effects of the above-mentioned ultrafine powder collection system is generally similar to the derivation process of the beneficial effects brought by the above-mentioned ultrafine powder collection device, which will not be elaborated here. The continuous production of ultrafine powder is realized, and the collection device can be unaffected by corrosive gases and high-temperature gases.

[0070] Among them, the ultrasonic atomization device is connected to the inlet of the pyrolysis furnace 200 and is used to send the atomized droplets into the pyrolysis furnace 200 through a carrier gas; the outlet of the pyrolysis furnace 200 is connected to the air inlet 11 of the ultrafine powder collection device and is used to send the carrier gas, the powder particles formed after the cracking reaction, and the reaction gas into the ultrafine powder collection device; the ultrafine powder collection device is the above-mentioned ultrafine powder collection device and is used to collect powder particles, discharge the carrier gas and the reaction gas, and treat the reaction gas.

[0071] In one embodiment, at least three powder collection devices are provided, and each is connected to the gas outlet pipe of the pyrolysis tube furnace. And the powder collection device is installed on the workbench.

[0072] The above-mentioned ultrasonic atomization device 100 and pyrolysis furnace 200 are both prior arts. The ultrasonic atomization device 100 utilizes ultrasonic waves to generate high-frequency vibrations on the atomization energy concentrator. When the molten metal flows from the liquid guide pipe to the surface of the energy concentrator, it is spread into a liquid film by the vibration of the energy concentrator surface. When the amplitude of the vibration surface reaches a certain value, the thin liquid layer is broken by the ultrasonic vibration, and the excited droplets fly out from the vibration surface to form mist droplets.

[0073] The working process of the present invention is as follows: The solution is transported into the ultrasonic atomization device 100, and the solution is atomized into micron-sized droplets by ultrasonic waves and sent into the pyrolysis furnace 200 through the carrier gas. The pyrolysis furnace 200 can adopt a high-temperature tubular furnace. After the droplets enter the pyrolysis furnace 200 and undergo a cracking reaction, powder particles are formed and enter the powder collection device together with the carrier gas and the reaction gas (waste gas). The powder is adsorbed in the powder collection device, and the waste gas and the carrier gas outlet 12 enter the waste gas treatment device 9, and the waste gas is neutralized by washing to achieve the working effect of pollution-free emission.

[0074] The following further elaborates on the present invention through specific embodiments.

[0075] The iron nitrate solution is placed in the ultrasonic atomization device 100, and the iron nitrate solution is atomized into droplets of 1 μm - 2 μm by high-frequency ultrasonic waves of 1 MHz - 3 MHz. The atomization device blows the atomized droplets into the tubular pyrolysis furnace 200 through the carrier gas, such as compressed air or inert gas. The furnace temperature is 1000°C - 1200°C. The iron nitrate droplets volatilize and undergo a thermal decomposition reaction to obtain iron oxide particles (sub-micron size) and the reaction gas (nitrogen oxide gas); the iron oxide particles, the reaction gas, and the carrier gas enter the conductive cylinder together. The electrode plate group 5 and the outer tube 2 are energized, and the iron oxide particles are adsorbed on the inner wall of the outer tube 2 under the action of the electric field force, and are centrally collected into the powder collection container 8 below the cylinder through the powder cleaning component 4. The reaction gas and the carrier gas enter the waste gas treatment device 9 through the outlet 12. Sodium hydroxide solution is placed in the waste gas treatment device 9, and the nitrogen oxide acidic gas in the mixed gas is removed through a neutralization reaction, thereby treating the waste gas.

[0076] Among them, the gas inlet mode can adopt positive pressure gas input, negative pressure vacuum suction, and simultaneous use of positive and negative pressures. The general carrier gas flow rate of the entire system does not exceed 50 L / min.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrafine powder collection device, characterized in that: include: An insulating end cover is provided with an air inlet and an air outlet; A conductive cylinder, the conductive cylinder comprising an inner tube and an outer tube arranged coaxially, the top ends of the outer tube and the inner tube are both connected to the insulating end cap, the space between the inner tube and the outer tube forms an air inlet channel, the air inlet channel is communicated with the air inlet, the top end of the inner tube is communicated with the air outlet, and the bottom end of the inner tube is communicated with the air inlet channel; An electrode sheet group is movably arranged in the air inlet passage, wherein the electrode sheet group and the outer tube are respectively connected to the negative electrode and the positive electrode of the power supply, and the powder can be adhered to the inner wall of the outer tube when powered on; A powder cleaning component is arranged in the air inlet channel, the powder cleaning component is connected to the electrode sheet group and is located above the electrode sheet group, and the powder cleaning component has a powder cleaning state and a powder collecting state. In the powder collecting state, the powder cleaning component is located at the top of the air inlet channel, and the electrode sheet group and the outer tube are energized to collect powder; in the powder cleaning state, the electrode sheet group and the outer tube are deenergized, and the powder cleaning component moves from the top of the air inlet channel to the bottom of the air inlet channel, scrapes off the powder on the inner wall of the outer tube and sends it into a powder collection container arranged at the bottom of the conductive cylinder; Also included is a driving mechanism, the driving mechanism comprising a driving member and a guide rod; The powder cleaning component is sleeved on the inner tube and includes: An annular movable block connected to the bottom end of the guide rod; An annular clamping block is arranged below the annular movable block, and the annular clamping block is connected to the annular movable block by bolts; An annular scraper block is arranged between the annular movable block and the annular clamping block, and the outer side of the annular scraper block is in contact with the inner wall of the outer tube; The electrode sheet group is sleeved on the inner tube and includes a plurality of annular electrode sheets, which are spaced apart along the length direction of the inner tube and connected to each other through connecting rods, the top of which is connected to the bottom of the annular clamping block or the annular movable block.

2. The ultrafine powder collecting device according to claim 1, characterized in that: The driving member is arranged outside the conductive cylinder, the driving member is connected to the insulating end cover through a bracket, a connecting disk is arranged at the driving end of the driving member, and the connecting disk and the insulating end cover are parallel to each other; The top ends of the plurality of guide rods are vertically connected to the connection plate, and the bottom end of each guide rod passes through the insulating end cover and extends into the air inlet channel to be connected to the powder cleaning assembly.

3. The ultrafine powder collecting device according to claim 1, characterized in that: The outer diameter of the annular scraper block is larger than the outer diameters of the annular movable block and the annular clamping block, and the inner diameter of the annular movable block is smaller than the inner diameters of the annular clamping block and the annular scraper block.

4. The ultrafine powder collecting device according to claim 1, characterized in that: The outer edge of the annular electrode sheet is configured to be sawtooth-shaped.

5. The ultrafine powder collecting device according to any one of claims 1 to 4, characterized in that: A conical guide hopper is connected between the conductive cylinder and the powder collection container, the expanded end of the conical guide hopper is connected to the bottom end of the outer tube, and the contracted end of the conical guide hopper is connected to the inlet of the powder collection container.

6. The ultrafine powder collecting device according to claim 5, characterized in that: It also includes an exhaust gas treatment device, which is connected to the air outlet through a pipeline.

7. The ultrafine powder collecting device according to claim 2, characterized in that: The driving member is any one of a pneumatic cylinder, a hydraulic cylinder and an electric cylinder.

8. An ultrafine powder collection system, characterized in that: include: An ultrasonic atomization device, a pyrolysis furnace, and an ultrafine powder collection device as described in any one of claims 1 to 7, wherein the ultrasonic atomization device is connected to the inlet of the pyrolysis furnace and is used to deliver atomized droplets into the pyrolysis furnace through a carrier gas; the outlet of the pyrolysis furnace is connected to the air inlet of the ultrafine powder collection device and is used to deliver the carrier gas, powder particles formed after the cracking reaction, and reaction gas into the ultrafine powder collection device.

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