An integrated granulation system and method based on electrostatic atomization

Abstract

The present invention provides an integrated granulation system and method based on electrostatic atomization, which comprises a stable liquid supply device, an array electrostatic atomization device and a freezing molding device. The liquid storage tank is connected to a voltage stabilizing box through a pump, and a vertically placed overflow plate is arranged in the voltage stabilizing box, which together constitute a stable liquid supply device; a high-voltage electrostatic generator is connected to an array nozzle to form contact charging; a layer of adjustment plate is arranged between the array nozzle and the ring electrode; and the freezing molding device solidifies the electrostatically atomized droplets. The present invention is particularly suitable for the efficient preparation of high-quality micron-level particle materials, and the stability of the electrostatic atomization process is ensured by a voltage stabilizing liquid supply system. At the same time, with the help of an external electric field, the particle parameters are accurately regulated, and further combined with the multi-nozzle array technology, the improvement of the powder particle quality such as monodispersity, sphericity, and particle size controllability and the improvement of the preparation efficiency are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrafine powder particle preparation, and in particular relates to an integrated granulation system and method based on electrostatic atomization. Background Art

[0002] Powder usually refers to the size between 10 -9 m to 10 -3 Compared with large solids, particle aggregates with diameters between 0.1 and 0.2 m have many characteristics such as large specific surface area, good fluidity, and high dispersion, which greatly improves the function and utilization rate of materials. At the same time, surface effects and scale effects can also enhance the thermal, optical, magnetic, chemical, and mechanical properties of powder particles, thus being widely used in automobile manufacturing, chemical engineering, composite materials, bioengineering, food engineering and other fields.

[0003] Existing fine particle preparation technologies mainly include extrusion, boiling, rolling spheroidization and spray drying. Among them, extrusion, boiling and rolling spheroidization have the disadvantages of low particle strength, poor sphericity and rough surface. Although the sphericity of particles can be guaranteed by the traditional spray drying method, its particle size distribution range is large and the particle size is difficult to accurately control. Particle size and its distribution are the most basic morphological characteristics of powder particles, which directly determine the surface characteristics and comprehensive performance of the powder. At present, the morphology and particle size distribution control in the preparation process of powder particles have become an important research topic in the field of powder technology. Taking acoustic powder particle materials as an example, filling the back volume box of the speaker with micron-sized porous sound-absorbing particles can effectively eliminate the interference of back-radiated standing wave noise to improve the acoustic performance, and at the same time can amplify the equivalent volume of the speaker to reduce the volume of the speaker cavity. However, when the filling particles have surface defects, low strength, uneven particle size distribution and other problems, not only the filling effect is poor, but also serious damage to the speaker may be caused. Summary of the invention

[0004] In response to the above technical problems, the present invention provides an integrated granulation system and method based on electrostatic atomization. The present invention includes a stable liquid supply device, an array electrostatic atomization device and a freezing molding device, which are particularly suitable for the efficient preparation of high-quality micron-sized particle materials. The stability of the system is ensured by a voltage-stabilized liquid supply system, and the particle parameters are further precisely controlled by means of an external electric field. At the same time, combined with multi-nozzle array technology, the quality of powder particles such as monodispersity, sphericity, and particle size controllability is improved, as well as the preparation efficiency is enhanced.

[0005] The technical solution of the present invention is: an integrated granulation system based on electrostatic atomization, comprising a liquid supply device, an array electrostatic atomization device and a freezing molding device;

[0006] The liquid supply device includes a liquid storage tank, a pump, a pressure stabilizing tank, an overflow plate, a reflux side, a liquid supply side and a stop valve; the pressure stabilizing tank is located above the liquid storage tank, an overflow plate is provided in the pressure stabilizing tank, the overflow plate divides the pressure stabilizing tank into a reflux side and a liquid supply side, the liquid storage tank is connected to the liquid supply side through a first pipeline, a pump is provided on the first pipeline, and the overflow plate is connected to the liquid storage tank through a second pipeline;

[0007] The array electrostatic atomization device comprises a high-voltage electrostatic generator, a rectifying chamber, an array nozzle, an adjustment plate, an annular electrode and an electrode mounting plate; the rectifying chamber is connected to the liquid supply side through a third pipeline, and a stop valve is arranged on the third pipeline; the array nozzle is located at the bottom of the rectifying chamber, the electrode mounting plate is located below the array nozzle, and the electrode mounting plate is provided with an array-arranged annular electrode, and a through hole is arranged in the annular electrode, and the through hole corresponds to the position of the array nozzle; the adjustment plate is located between the array nozzle and the annular electrode, and the distance between the array nozzle, the adjustment plate and the annular electrode can be adjusted; the array nozzle is connected to the high-voltage electrostatic generator;

[0008] The freezing molding device comprises a filter and a container, the top of the container is open, the array electrostatic atomization device is located above the container, the filter is placed in the container, a low-temperature refrigerant is arranged in the container, and the low-temperature refrigerant does not pass the bottom of the filter.

[0009] In the above solution, the array nozzle, the adjustment plate and the ring electrode are connected by bolts;

[0010] A plurality of gaskets are arranged between the array nozzle and the adjustment plate, and a plurality of gaskets are arranged between the adjustment plate and the ring electrode.

[0011] In the above solution, the low-temperature refrigerant is liquid nitrogen, and the filter screen and container are made of stainless steel.

[0012] Furthermore, the height of liquid nitrogen in the container is not less than 20 mm, and the height of the array nozzle from the liquid nitrogen surface is 300 mm-500 mm. The speed of the spray droplets hitting the liquid nitrogen surface within this distance range is ideal, and the liquid nitrogen depth is conducive to the full solidification of the slurry.

[0013] In the above solution, the liquid supply device also includes a stirrer; the stirrer is located in the liquid storage tank.

[0014] In the above scheme, the height of the overflow plate in the pressure stabilizing tank can be adjusted, and the flow of the liquid supply system is adjusted by the liquid level height, and it does not exceed 2 / 3 of the height of the pressure stabilizing tank to avoid slurry overflow due to pipeline blockage.

[0015] In the above solution, the annular electrode is grounded.

[0016] In the above scheme, the aperture d of the array nozzle is 0.2-1.0 mm, and the spacing D between adjacent nozzles in the array nozzle is not less than 25 mm. This aperture range can avoid clogging of the slurry in the nozzle on the basis of obtaining a smaller particle size, and the nozzle spacing can effectively avoid electrostatic interference between adjacent nozzles and improve the operating stability of the granulation system.

[0017] In the above scheme, the filter screen does not contact the inner wall of the container, and there is a gap of not less than 30 mm, so as to prevent the slurry droplets from hitting the wall of the container before solidification, thereby affecting the sphericity of the particles.

[0018] A method according to the integrated granulation system based on electrostatic atomization comprises the following steps:

[0019] The pump is started to transport the slurry from the liquid storage tank to the liquid supply side of the upper pressure stabilizing tank. When the slurry level in the liquid supply side rises to the overflow plate, the excess slurry overflows into the return side. At this time, the stop valve is opened to start supplying liquid to the array electrostatic atomization device.

[0020] After the slurry first fills the rectifying cavity, the high-voltage electrostatic generator and the array nozzle are turned on;

[0021] The atomized droplet size parameters can be controlled by adjusting the applied voltage value of the high-voltage electrostatic generator and the distance between the array nozzle and the ring electrode;

[0022] A freezing forming device containing low-temperature refrigerant is placed directly below the array electrostatic atomization device, so that the atomized droplets enter the low-temperature refrigerant for freezing forming and are collected in the filter.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention includes a stable liquid supply device, an array electrostatic atomization device and a freezing molding device; the liquid storage tank is connected to a pressure stabilizing box through a pump, and a vertically placed overflow plate is arranged in the pressure stabilizing box, which together constitute a stable liquid supply device; a high-voltage electrostatic generator is connected to the array nozzle to form a contact charging; the aperture of the array nozzle is in the range of 0.2-1.0mm, and the distance between adjacent array nozzles is not less than 25mm; a layer of adjustment plate is arranged between the array nozzle and the ring electrode; the freezing molding device uses liquid nitrogen to solidify the electrostatically atomized droplets. The present invention utilizes electrostatic atomization technology and adopts a multi-nozzle array scheme to achieve improvements in particle quality such as monodispersity, sphericity, and particle size controllability, as well as an increase in preparation efficiency. In the present invention, a pressure stabilizing box is used for liquid supply, which not only saves energy consumption, but also has a stable liquid supply process and a uniform feeding speed, which provides a guarantee for the continuous production of the system. The present invention introduces high-voltage electrostatic action in the form of contact charging to improve the uniformity of particle size distribution. At the same time, by adjusting the system parameters such as the overflow plate height of the pressure regulating box, the applied voltage, the nozzle aperture and spacing, the particle size can be precisely controlled, the system operation flexibility is improved, and different production needs can be met. The present invention adopts a multi-nozzle array solution, which further improves the system production efficiency on the basis of ensuring product quality. The present invention optimizes the structure by designing a liquid nitrogen freezing device to cooperate with the electrostatic atomization process, accurately controls the movement speed of the spray droplets, and weakens the deformation caused by the particles hitting the liquid nitrogen surface, thereby improving the sphericity parameters of the particle products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of an electrostatic atomization granulation system according to one embodiment of the present invention;

[0025] Figure 2 An array electrostatic atomization device according to one embodiment of the present invention;

[0026] Figure 3 This is a nozzle array solution of one embodiment of the present invention.

[0027] In the figure: 1. Liquid storage tank; 2. Agitator; 3. Pump; 4. Pressure regulating box; 5. Overflow plate; 6. Reflux side; 7. Liquid supply side; 8. Stop valve; 9. Array electrostatic atomization device; 9-1. High-voltage electrostatic generator; 9-2. Rectification chamber; 9-3. Array nozzle; 9-4. Adjustment plate; 9-5. Ring electrode; 10. Filter; 11. Container. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Figure 1 The figure shows a preferred embodiment of the integrated material granulation system based on electrostatic atomization, which includes a liquid supply device, an array electrostatic atomization device and a freezing molding device.

[0032] The liquid supply device includes a liquid storage tank 1, an agitator 2, a pump 3, a pressure stabilizing tank 4, an overflow plate 5, a reflux side 6, a liquid supply side 7 and a stop valve 8; the liquid storage tank 1 is used to hold slurry, the agitator 2 is located in the liquid storage tank 1, and stirs the slurry to prevent the slurry from precipitating in the liquid storage tank 1, thereby affecting the uniformity of the texture of the final product and causing blockage of the array nozzles, pipelines, etc.; the pressure stabilizing tank 4 is set at a certain height, the pressure stabilizing tank 4 is located above the liquid storage tank 1, and a vertically placed overflow plate 5 is provided in the pressure stabilizing tank 4, the overflow plate 5 divides the pressure stabilizing tank 4 into two parts, the reflux side 6 and the liquid supply side 7, the liquid storage tank 1 is connected to the liquid supply side 7 through a first pipeline, the first pipeline is provided with a pump 3, in this embodiment, considering the viscosity characteristics of the slurry, the pump 3 is a peristaltic pump; the overflow plate 5 is connected to the liquid storage tank 1 through a second pipeline.

[0033] like Figure 2 and 3 As shown, the array electrostatic atomization device 9 includes a high-voltage electrostatic generator 9-1, a rectifying cavity 9-2, an array nozzle 9-3, an adjustment plate 9-4, a ring electrode 9-5 and an electrode mounting plate; the rectifying cavity 9-2 is connected to the liquid supply side 7 through a third pipeline, and a stop valve 8 is provided on the third pipeline. The liquid supply side 7 supplies liquid to the rectifying cavity 9-2 through the third pipeline; the rectifying cavity 9-2 is horizontally placed and located at the top of the entire array electrostatic atomization device 9, and the array nozzle 9-3 is located on the bottom plate of the rectifying cavity 9-2. The array nozzle 9-3 adopts an array The arrangement scheme can eliminate the electrostatic interference between the nozzles. The electrode mounting plate is located below the array nozzle 9-3. The electrode mounting plate is provided with an array-arranged annular electrode 9-5. The annular electrode 9-5 is provided with a through hole, and the through hole corresponds to the position of the array nozzle 9-3. The adjustment plate 9-4 is located between the array nozzle 9-3 and the annular electrode 9-5. The distance between the array nozzle 9-3, the adjustment plate 9-4 and the annular electrode 9-5 can be adjusted. The array nozzle 9-3 adopts a contact charging method, and the array nozzle 9-3 is connected to the high-voltage electrostatic generator 9-2. The entire pipeline has good sealing.

[0034] In this embodiment, the slurry extracted by the peristaltic pump is first supplied to the liquid supply side 7 from above. When the slurry height on the liquid supply side 7 reaches the height of the overflow plate 5, the excess slurry overflows into the reflux side 6 and flows back to the liquid storage tank 1 through the pipeline; the slurry in the liquid supply side 7 maintains a fixed pressure difference, and a third pipeline connected with an opening is provided at the bottom of the liquid supply side 7 to stably and continuously supply liquid to the array electrostatic atomization device 9.

[0035] The freezing molding device includes a filter 10 and a container 11. The top of the container 11 is open. The array electrostatic atomization device 9 is located above the container 11. The filter 10 is placed in the container 11. The container 11 is provided with a low-temperature refrigerant, and the low-temperature refrigerant does not pass through the bottom of the filter 10.

[0036] The array nozzle 9-3, the adjustment plate 9-4 and the ring electrode 9-5 are connected by bolts; a plurality of gaskets are arranged between the array nozzle 9-3 and the adjustment plate 9-4, and a plurality of gaskets are arranged between the adjustment plate 9-4 and the ring electrode 9-5. By increasing or decreasing the number of gaskets, the distance between the array nozzle 9-3, the adjustment plate 9-4 and the ring electrode 9-5 can be adjusted. The adjustment plate 9-4 is made of insulating bakelite material, and the electric field distribution during the electrostatic atomization process is adjusted by the adjustment plate 9-4. The ring electrode 9-5 is grounded, and there is a certain potential difference between it and the array nozzle 9-3, thereby inducing the slurry to produce electrostatic atomization fragmentation.

[0037] The array nozzle 9-3 is made of metal material, and the adjustment plate 9-4 is made of insulating bakelite material.

[0038] The cryogenic refrigerant is liquid nitrogen, and the filter screen 10 and the container 11 are made of stainless steel. The filter screen 10 is suspended inside the container 11 and is well grounded; the height of the liquid nitrogen in the container 11 is not less than 20mm, and the height of the array nozzle 9-3 from the liquid nitrogen liquid level is 300mm-500mm. The speed of the spray droplets hitting the liquid nitrogen surface within this distance range is relatively ideal, and a certain liquid nitrogen depth is conducive to the full solidification of the slurry. The stainless steel filter screen 10 and the stainless steel container 11, together with the addition of liquid nitrogen, constitute a liquid nitrogen freezing forming device; the size of the filter screen 10 is slightly smaller than the container 11, and the height of the liquid nitrogen in the container 11 is kept not less than 400mm, and the height of the bottom of the filter screen 10 is not less than 200mm, so as to control the speed of the droplets hitting the liquid nitrogen surface and avoid hitting the solid wall surface to affect the sphericity of the particles; the freezing forming device is located below the array electrostatic atomization device 9. Under the combined action of the electric field force and gravity, the atomized droplets enter the liquid nitrogen for freezing forming and are filtered and collected by the filter screen 10.

[0039] The overflow plate 5 in the pressure stabilizing tank 4 can be adjusted in height to adjust the flow of the liquid supply system by the liquid level height, and it should not exceed 2 / 3 of the height of the pressure stabilizing tank 4 to avoid slurry overflow due to pipeline blockage. The entire pressure stabilizing tank 4 is made of insulating material.

[0040] The aperture d of the array nozzle 9-3 is 0.2-1.0 mm, and the spacing D between adjacent nozzles in the array nozzle 9-3 is not less than 25 mm. This aperture range can avoid clogging of the slurry in the nozzle on the basis of obtaining a smaller particle size, and the nozzle spacing can effectively avoid electrostatic interference between adjacent needles and improve the operating stability of the granulation system.

[0041] The filter screen 10 does not contact the inner wall of the container 11, and there is a gap of not less than 30 mm to prevent the slurry droplets from hitting the wall before solidification, thereby affecting the sphericity of the particles.

[0042] A method according to the integrated granulation system based on electrostatic atomization comprises the following steps:

[0043] Start the agitator 2 to continuously stir the material slurry in the liquid storage tank 1 to prevent the slurry from settling; after the slurry in the liquid storage tank 1 is stirred evenly, start the peristaltic pump to transport the slurry from the liquid storage tank 1 to the liquid supply side 7 of the upper pressure stabilizing tank 4. When the slurry level in the liquid supply side 7 rises to the overflow plate 5, the excess slurry overflows into the reflux side 6. At this time, open the stop valve 8 to start supplying liquid to the array electrostatic atomization device 9;

[0044] After the slurry first fills the rectifying cavity 9-2, the high-voltage electrostatic generator 9-1 and the array nozzle 9-3 are turned on to ensure that the flow between the array nozzles is uniform;

[0045] By adjusting the number of gaskets to change the distance between the array nozzle 9-3 and the annular electrode 9-5 and adjusting the applied voltage value of the high-voltage electrostatic generator 9-2, the particle size parameters of the atomized droplets can be precisely controlled.

[0046] A freezing molding device containing low-temperature refrigerant is placed directly below the array electrostatic atomization device 9, so that the atomized droplets enter the low-temperature refrigerant for freezing molding, are collected in the filter 10, and then undergo a vacuum freeze-drying process to form the final product.

[0047] The present invention includes three parts: a stable liquid supply device, an array electrostatic atomization device, and a freezing molding device; the liquid storage tank is connected to a voltage stabilizing box through a peristaltic pump, and a vertically placed overflow plate is arranged in the voltage stabilizing box, which together constitute a stable liquid supply device; a high-voltage electrostatic generator is connected to an array nozzle to form a contact charging; the aperture of the array nozzle is within the range of 0.2-1.0mm, and the distance between adjacent array nozzles is not less than 25mm; a layer of insulating bakelite material electric field adjustment plate is arranged between the array nozzle and the ring electrode; the freezing molding device uses liquid nitrogen to solidify the electrostatically atomized droplets. The present invention utilizes electrostatic atomization technology and adopts a multi-nozzle array solution to achieve improvements in particle quality such as monodispersity, sphericity, and particle size controllability, as well as an increase in preparation efficiency.

[0048] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An integrated granulation system based on electrostatic atomization, characterized in that: It includes a liquid supply device, an array electrostatic atomization device and a freezing molding device; The liquid supply device comprises a liquid storage tank (1), a pump (3), a pressure stabilizing tank (4), an overflow plate (5), a reflux side (6), a liquid supply side (7) and a stop valve (8); the pressure stabilizing tank (4) is located above the liquid storage tank (1), an overflow plate (5) is provided in the pressure stabilizing tank (4), the overflow plate (5) divides the pressure stabilizing tank (4) into a reflux side (6) and a liquid supply side (7), the liquid storage tank (1) is connected to the liquid supply side (7) via a first pipeline, the first pipeline is provided with a pump (3), and the overflow plate (5) is connected to the liquid storage tank (1) via a second pipeline; The array electrostatic atomization device (9) comprises a high-voltage electrostatic generator (9-1), a rectifying chamber (9-2), an array nozzle (9-3), an adjustment plate (9-4), an annular electrode (9-5) and an electrode mounting plate; the rectifying chamber (9-2) is connected to the liquid supply side (7) via a third pipeline, and a stop valve (8) is provided on the third pipeline; the array nozzle (9-3) is located at the bottom of the rectifying chamber (9-2), the electrode mounting plate is located below the array nozzle (9-3), the electrode mounting plate is provided with annular electrodes (9-5) arranged in an array, and a through hole is provided in the annular electrode (9-5), and the through hole corresponds to the position of the array nozzle (9-3); the adjustment plate (9-4) is located between the array nozzle (9-3) and the annular electrode (9-5), and the distance between the array nozzle (9-3), the adjustment plate (9-4) and the annular electrode (9-5) can be adjusted; the array nozzle (9-3) is connected to the high-voltage electrostatic generator (9-1); The freezing molding device comprises a filter screen (10) and a container (11); the top of the container (11) is open; the array electrostatic atomization device (9) is located above the container (11); the filter screen (10) is placed in the container (11); a low-temperature refrigerant is provided in the container (11); and the low-temperature refrigerant does not pass through the bottom of the filter screen (10); The low-temperature refrigerant is liquid nitrogen, the filter screen (10) and the container (11) are made of stainless steel, the filter screen (10) does not contact the inner wall of the container (11), and there is a gap of not less than 30 mm; The height of the liquid nitrogen in the container (11) is not less than 20 mm, and the height of the array nozzle (9-3) from the liquid nitrogen surface is 300 mm to 500 mm; The aperture d of the array nozzle (9-3) is 0.2-1.0 mm, and the spacing D between adjacent nozzles in the array nozzle (9-3) is not less than 25 mm; The height of the overflow plate (5) in the pressure stabilizing box (4) can be adjusted and does not exceed 2 / 3 of the height of the pressure stabilizing box (4).

2. The integrated granulation system based on electrostatic atomization according to claim 1, characterized in that: The array nozzle (9-3), the adjustment plate (9-4) and the ring electrode (9-5) are connected by bolts; A plurality of gaskets are provided between the array nozzle (9-3) and the adjustment plate (9-4), and a plurality of gaskets are provided between the adjustment plate (9-4) and the annular electrode (9-5).

3. The integrated granulation system based on electrostatic atomization according to claim 1 is characterized in that: The liquid supply device further comprises a stirrer (2); the stirrer (2) is located in the liquid storage tank (1).

4. The integrated granulation system based on electrostatic atomization according to claim 1, characterized in that: The annular electrode (9-5) is grounded.

5. The integrated granulation system based on electrostatic atomization according to claim 1, characterized in that: The filter screen (10) does not contact the inner wall of the container (11), and there is a gap of not less than 30 mm.

6. A method of an integrated granulation system based on electrostatic atomization according to any one of claims 1 to 5, characterized in that: The following steps are involved: The pump (3) is started to transport the slurry from the liquid storage tank (1) to the liquid supply side (7) of the upper pressure stabilizing tank (4); when the slurry level in the liquid supply side (7) rises to the overflow plate (5), the excess slurry overflows into the return side (6); at this time, the stop valve (8) is opened to start supplying liquid to the array electrostatic atomization device (9); After the slurry first fills the rectifying cavity (9-2), the high-voltage electrostatic generator (9-1) and the array nozzle (9-3) are turned on; The particle size parameters of the atomized droplets are controlled by adjusting the applied voltage value of the high-voltage electrostatic generator (9-1) and the distance between the array nozzle (9-3) and the annular electrode (9-5); A freezing and forming device containing a low-temperature refrigerant is placed directly below the array electrostatic atomization device (9), so that the atomized liquid droplets enter the low-temperature refrigerant to be frozen and formed, and are collected in the filter screen (10).

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