Counter gas screw powder feeding device and double cycle collision system and method based on the device thereof

Abstract

The application discloses a kind of reverse gas spiral powder feeding device and based on its device's double-cycle collision system and method, belong to material preparation field, at least including but not limited to particle separation device, secondary cycle pipe and spiral powder feeding mechanism, the particle separation device is connected with existing particle collision cycle pipeline, the particle separation device is provided with multiple outlets according to the size of particle, and it at least includes fine particle outlet, coarse particle outlet and product particle outlet;The coarse particle outlet is connected with the feeding end of spiral powder feeding mechanism;The fine particle outlet is connected with existing particle collision cycle pipeline;The discharging end of the spiral powder feeding mechanism extends into existing particle collision cycle pipeline;It improves the impact speed between mixed impact target powder, improves the impact energy, solves the problem that the speed difference between mixed impact target powder is low, and the collision effect is not good.

Description

Technical Field

[0001] This invention relates to the field of material preparation, and in particular to a reverse-air spiral powder feeding device and a dual-circulation collision system and method based thereon. Background Technology

[0002] Low-temperature solid-phase reaction synthesis technology is a rapidly developing new material preparation technology in recent years. Its essential feature is the energy transfer at room temperature or low temperature. That is, mechanical energy is introduced into the powdered reaction agent system through mechanical grinding and other methods, and then converted into the chemical energy of the reaction system, thereby realizing solid-phase synthesis at room temperature.

[0003] From the perspective of materials preparation technology, a necessary condition for realizing low-temperature solid-phase synthesis reactions is the introduction of mechanical energy into the system to induce the reaction. Currently, supersonic gas flow acceleration technology is a widely used technique. The basic principle of this method is as follows: a high-speed gas flow (gas flow Mach number M = 1.5 / M3.0, and nozzles with different Mach numbers can be used as needed) is generated by a supersonic nozzle. The materials participating in the reaction are sent into the gas flow acceleration channel, and after being accelerated by the gas flow, they collide, thereby converting the mechanical energy of the materials into chemical energy, thus realizing the preparation of materials.

[0004] Existing device structure such as Figure 1 As shown, the device is a circulating structure. Section 41 is the stabilization section, used to control the energy of the supersonic airflow; section 42 is the supersonic nozzle, used to accelerate the airflow to supersonic speeds; section 43 is the acceleration section, used for particle acceleration; section 44 is the collision chamber, used for collision reactions of different raw materials; section 47 is the target head, used for solid particle collisions; section 48 is the product recovery unit, used to recover products that meet the requirements; section 45 is the circulation pipe, used for repeated cyclic collisions of solid particles that do not meet the requirements; and section 46 is the gas source, used to provide power for the airflow of the device. Its basic principle is that particles, carried by the airflow, sequentially pass through the stabilization section, nozzle, and acceleration section. After colliding with the target head in the collision chamber, they pass through the circulation pipe. Products that meet the requirements are recovered by the recovery unit, while solid particles that do not meet the requirements continue to accelerate and collide again along the circulation pipe until the requirements are met. Currently, during device operation, the particle feed gas flow can be positioned along the axial direction of the stable section, the nozzle axial direction, or the sidewall. However, regardless of the position, the main acceleration direction of the solid particles of different components is the same, i.e., along the gas flow direction. This makes it difficult to guarantee the velocity difference between particles of different components when they are about to collide in front of the target. The effectiveness of converting mechanical energy into chemical energy through particle collisions to induce low-temperature solid-phase reactions and synthesize new products is highly dependent on the velocity difference at the time of particle collision. Taking M=3.0 as an example, theoretically, after sufficient acceleration, although the absolute velocities of particles of different components can all reach 600-700 m / s, the velocity difference between them is very small because they are accelerated in the same direction. Therefore, it is difficult to achieve the conversion of mechanical energy into chemical energy through collisions. Summary of the Invention

[0005] The purpose of this invention is to provide a reverse-flow spiral powder feeding device and a dual-circulation collision system and method based thereon, which addresses the above-mentioned shortcomings. This improves the collision velocity and energy between the mixed target powders, solves the problem of low velocity difference and poor collision effect between the mixed target powders, and achieves higher reaction efficiency for organic materials. For inorganic materials, it can improve the rupture efficiency of the oxide layer on the surface of coarse particles, and even achieve the effect of embedding fine particles into coarse particles, thereby introducing mechanical energy to induce the reaction.

[0006] This invention is achieved through the following scheme:

[0007] A reverse-air spiral powder feeding device includes, but is not limited to, a particle separation device, a secondary circulation pipe, and a spiral powder feeding mechanism. The particle separation device is connected to an existing particle collision circulation pipeline. The particle separation device has multiple outlets according to different particle sizes, including at least a fine particle outlet, a coarse particle outlet, and a product particle outlet. The coarse particle outlet is connected to the feed end of the spiral powder feeding mechanism. The fine particle outlet is connected to the existing particle collision circulation pipeline. The discharge end of the spiral powder feeding mechanism extends into the existing particle collision circulation pipeline.

[0008] Based on the structure of the above-mentioned reverse-air spiral powder feeding device, the spiral powder feeding mechanism includes a feeding cylinder, a spiral feeding rod, a powder feeding pipe, and a power mechanism; the spiral feeding rod is sleeved in the powder feeding pipe, the power mechanism is connected to the spiral feeding rod, and the feeding cylinder is disposed on the side wall of the spiral feeding rod near the power mechanism.

[0009] Based on the structure of the aforementioned reverse-air spiral powder feeding device, the power mechanism includes a power source, a central rotating shaft, rolling bearings, and a sealing ring. The power source is connected to the central rotating shaft. The spiral powder feeding mechanism body also has a rotating cavity for accommodating the rolling bearings. At least two rolling bearings are provided in the rotating cavity. The central rotating shaft is disposed in the rolling bearings, and the sealing ring is disposed on the contact portion between the central rotating shaft and the spiral powder feeding mechanism.

[0010] Based on the structure of the above-mentioned reverse-air spiral powder feeding device, the spiral feeding mechanism further includes a connecting flange and a sealing ring. The spiral feeding mechanism is connected to the existing particle collision circulation pipeline through the connecting flange, and a sealing ring can be provided on the contact part between the powder feeding pipe and the connecting flange.

[0011] Based on the structure of the above-mentioned reverse-air spiral powder feeding device, the particle separation device specifically adopts a cyclone separator, which can distinguish particles of different sizes at different outlets according to their different masses.

[0012] This solution also discloses a dual-circulation collision system, including but not limited to a reverse-air spiral powder feeding device and a main circulation pipeline; the main circulation pipeline includes a stabilization section, a supersonic jet pipe section, an acceleration section, a collision chamber, a circulation pipe, and a gas source; the stabilization section, the supersonic jet pipe section, the acceleration section, and the collision chamber are connected in sequence, the circulation pipeline is connected to the collision chamber and the stabilization section respectively, and the gas source is set on the pipe wall on the side of the stabilization section; the inlet end of the reverse-air spiral powder feeding device is connected to the circulation pipeline, and the outlet end of the reverse-air spiral powder feeding device is inserted into the collision chamber.

[0013] Based on the structure of the above-mentioned dual-cycle collision system, the central axis of the powder feeding pipe end of the reverse-air spiral powder feeding device is coaxially arranged with the pipeline formed by the stabilization section, the supersonic spray pipe section, and the acceleration section.

[0014] Based on the structure of the above-mentioned dual-cycle collision system, the diameter of the powder feeding pipe is the same as the diameter of the gas source output pipe, and the outlet end of the powder feeding pipe is directly opposite the gas source output pipe.

[0015] Based on the structure of the aforementioned dual-circulation collision system, the position of the powder pipe outlet end was determined by establishing a uniform flow field through CFD theoretical calculations.

[0016] This invention also discloses a double-loop collision method, which specifically includes the following steps:

[0017] Step 1: Weigh out a predetermined amount of the original solid particles according to the proportion of different components in the product;

[0018] Step 2: Driven by an air source, create a supersonic circulating airflow within the main circulation pipeline;

[0019] Step 3: Add the predetermined amount of raw solid particles into the supersonic circulating airflow in the main circulation pipeline;

[0020] Step 4: Solid particles pass through the stabilization section, nozzle, and acceleration section in sequence, during which random collisions will occur; after the mixed particles enter the circulation pipeline through the collision chamber, the coarse particles are separated by the particle separation device and enter the secondary circulation pipeline, while the fine particles return to the upstream of the device through the circulation pipeline for re-acceleration.

[0021] The separated coarse particles enter the spiral powder feeding mechanism through the secondary circulation pipe and are sequentially fed to the powder feeding pipe outlet. At the powder feeding pipe outlet, since there is no airflow acceleration, the coarse particles with low speed collide with the supersonic fine particles that have been accelerated upstream.

[0022] Step 5: The mixed particles after the collision enter the main circulation pipe. The coarse particles are separated by the separation device, and the products that meet the requirements are recovered by the recovery device through the predetermined outlet end of the separation device. The remaining fine particles return to the upstream of the device for re-acceleration.

[0023] Step Six: Repeat steps four and five until all the required products are obtained, then turn off the gas supply.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. This solution no longer uses the traditional method of mixing particles of different materials and sizes to impact a fixed target head. Instead, it replaces the original target head with a spiral powder feeding device, which sends large-diameter materials to the end face of the original target head. Here, they collide with small-diameter materials that have been accelerated at high speed by the front end, thereby increasing the impact speed between materials of different sizes. The impact speed can reach more than twice the original speed, resulting in higher collision efficiency.

[0026] 2. This solution increases the impact velocity and impact energy between the mixed target powders, solving the problem of low velocity difference and poor collision effect between the mixed target powders. For organic materials, the reaction efficiency is higher, and for inorganic materials, it can improve the breaking efficiency of the oxide layer on the surface of coarse particles, and even achieve the effect of embedding fine particles into coarse particles, so as to introduce mechanical energy to induce the reaction. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of existing technology;

[0028] Figure 2 This is a schematic diagram showing the position and structure of the reverse-air spiral powder feeding device in this invention;

[0029] Figure 3 This is a cross-sectional structural diagram of the spiral powder feeding mechanism in this invention;

[0030] Figure 4 This is a schematic diagram of the spiral feed rod in this invention;

[0031] Figure 5 This is a diagram showing the collision effect after coarse and fine powders are fed into the same side.

[0032] Figure 6 A diagram illustrating the collision effect of the reverse airflow spiral powder feeding device in a dual-circulation collision system.

[0033] The diagram shows the following markings: 1. Particle separation device; 2. Secondary circulation pipe; 3. Screw powder feeding mechanism; 4. Main circulation pipeline; 31. Feed cylinder; 32. Screw feed rod; 33. Powder feeding pipe; 34. Power mechanism; 35. Power source; 36. Central rotating shaft; 37. Rolling bearing; 38. Sealing ring; 39. Rotating cavity; 310. Connecting flange; 41. Stabilizing section; 42. Ultrasonic spray pipe section; 43. Acceleration section; 44. Collision chamber; 45. Circulation pipeline; 46. Air source; 47. Target head; 48. Product recovery device. Detailed Implementation

[0034] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0035] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0036] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a predetermined orientation, or be constructed and operated in a predetermined orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0038] Example 1

[0039] like Figures 2-4 As shown, the present invention provides a technical solution:

[0040] A reverse-flow spiral powder feeding device includes, but is not limited to, a particle separation device 1, a secondary circulation pipe 2, and a spiral powder feeding mechanism 3. The particle separation device 1 is connected to an existing particle collision circulation pipeline. The particle separation device 1 is provided with multiple outlets according to different particle sizes, including at least a fine particle outlet, a coarse particle outlet, and a product particle outlet. The coarse particle outlet is connected to the feed end of the spiral powder feeding mechanism 3. The fine particle outlet is connected to the existing particle collision circulation pipeline. The discharge end of the spiral powder feeding mechanism 3 extends into the existing particle collision circulation pipeline.

[0041] Based on the above structure, the particle separation device 1 is used to classify various particles in the particle collision circulation pipeline, such as coarse particles, fine particles and product particles. The coarse particles will be sent back to the existing particle collision circulation pipeline under the action of the spiral powder feeding mechanism 3 to collide with the high-speed fine particles. Since the speed of the coarse particles transported by the spiral powder feeding mechanism 3 is basically zero, there is a large speed difference between the coarse particles and the fine particles, which makes it better to realize the conversion of mechanical energy into chemical energy through collision and thus obtain new products.

[0042] As an example, the spiral powder feeding mechanism 3 may include a feed cylinder 31, a spiral feeding rod 32, a powder feeding pipe 33, and a power mechanism 34; the spiral feeding rod 32 is sleeved in the powder feeding pipe 33, the power mechanism 34 is connected to the spiral feeding rod 32, and the feed cylinder 31 is disposed on the side wall of the spiral feeding rod 32 near the power mechanism 34.

[0043] Based on the above structure, the power mechanism 34 drives the screw feeder 32 to rotate. The coarse particles to be transported are squeezed towards the outlet of the powder feeding pipe 33 under the rotation of the screw feeder 32 until the coarse particles are squeezed out of the powder feeding pipe 33 and enter the existing particle collision circulation pipeline with an initial velocity of zero. At the same time, the coarse particles that are not impacted to form new particles are separated again by the particle separation device 1 in the existing particle collision circulation pipeline and returned to the powder feeding pipe 33 for repeated circulation. This device can improve the collision efficiency, thereby improving the generation efficiency of new particles.

[0044] As an example, the power mechanism 34 may include a power source 35, a central rotating shaft 36, rolling bearings 37, and a sealing ring 38; the power source 35 is connected to the central rotating shaft 36, and the spiral powder feeding mechanism 3 body is also provided with a rotating cavity 39 for accommodating the rolling bearings 37. At least two rolling bearings 37 are provided in the rotating cavity 39, the central rotating shaft 36 is disposed in the rolling bearings 37, and the sealing ring 38 is disposed on the contact part between the central rotating shaft 36 and the spiral powder feeding mechanism 3.

[0045] Based on the above structure, the power source 35 drives the central shaft 36 to rotate, thereby driving the screw feed rod 32 to rotate. At least two rolling bearings 37 can ensure the stability of rotation, and a sealing ring 38 can ensure the overall airtightness.

[0046] As an example, the screw feeding mechanism may also include a connecting flange 310 and a sealing ring 38. The screw feeding mechanism is connected to the existing particle collision circulation pipeline through the connecting flange 310. At the same time, a sealing ring 38 may be provided on the contact part between the powder feeding pipe 33 and the connecting flange 310 to ensure the sealing performance of the overall device. The powder feeding amount per unit time can be adjusted by adjusting the tooth pitch or the speed of the drive motor.

[0047] As an example, the particle separation device 1 can specifically employ a cyclone separator, which can separate particles of different sizes at different outlets based on their mass.

[0048] Example 2

[0049] like Figures 2-4 As shown, the present invention provides a technical solution:

[0050] A dual-circulation collision system includes, but is not limited to, a reverse-air spiral powder feeding device and a main circulation pipeline 4; the main circulation pipeline 4 may include a stabilization section 41, a supersonic jet pipe section 42, an acceleration section 43, a collision chamber 44, a circulation pipe 45, and an air source 46; the stabilization section 41, the supersonic jet pipe section 42, the acceleration section 43, and the collision chamber 44 are connected in sequence, the circulation pipeline is connected to the collision chamber 44 and the stabilization section 41 respectively, and the air source 46 is disposed on the pipe wall on the side of the stabilization section 41; the inlet end of the reverse-air spiral powder feeding device is connected to the circulation pipeline, and the outlet end of the reverse-air spiral powder feeding device is inserted into the collision chamber 44.

[0051] Based on the above structure, the stabilization section 41 is used to control the energy of the supersonic airflow; the supersonic nozzle is used to accelerate the airflow to supersonic speed; the acceleration section 43 is used for particle acceleration; the collision chamber 44 is used for collision reactions of different raw materials; the circulation pipe 45 is used for repeated cyclic collisions of solid particles that do not meet the requirements; and the gas source 46 is used to provide power for the airflow of the device. In this scheme, the existing main circulation pipe 4 is used to circulate fine particulate matter, and then, in conjunction with the reverse air spiral powder feeding device, coarse particulate matter is circulated to realize a dual-circulation collision system. At the same time, coarse particulate matter is sent into the collision chamber 44 with an initial velocity of zero to collide with the high-speed fine particles in the main circulation pipe 4. At this time, the coarse particles have a very small velocity, that is, there is a large velocity difference between large and small particles, which is conducive to the fine particles colliding into the coarse particles.

[0052] As an example, the central axis of the end of the powder feeding pipe 33 of the reverse air spiral powder feeding device is coaxially arranged with the pipeline formed by the stabilizing section 41, the supersonic spray pipe section 42, and the acceleration section 43.

[0053] Based on the above structure, by setting the outlet end of the coarse particles to be coaxial with the center of the particle flow formed by the acceleration of fine particles, the coarse particles with an initial velocity of zero can collide with the accelerated fine particles as much as possible, thereby improving the collision efficiency and making it more conducive for the fine particles to collide into the coarse particles.

[0054] As an example, the diameter of the powder feeding pipe 33 is the same as the output pipe diameter of the gas source 46, and the outlet end of the powder feeding pipe 33 is directly opposite the output pipe of the gas source 46.

[0055] Based on the above structure, the powder feeding pipe 33 delivers coarse particles through the spiral feeding rod 32. At this time, the discharge position of the coarse particles in the collision chamber 44 is at the edge contour of the powder feeding pipe 33. The powder feeding pipe 33 is directly opposite the air source 46, and the diameter of the two pipes is the same, which can enable the coarse particles to collide with the high-speed fine particles more efficiently.

[0056] As an example, the location of the outlet end of the powder feeding pipe 33 was determined by CFD calculation to establish a uniform flow field, and it is a location that will not cause airflow blockage.

[0057] Based on the above structure, the position of the outlet end of the powder feeding pipe 33 needs to be specially designed. This is because if the outlet end of the powder feeding pipe 33 is too close to the air inlet of the collision chamber 44, the shock wave formed at the outlet end will enter the acceleration section 43, resulting in excessively high back pressure in the collision chamber 44, which will affect the establishment of the upstream supersonic flow field. If the distance between the front of the powder feeding pipe 33 and the air inlet of the collision chamber 44 is too far, the collision probability between coarse particles and high-speed fine particles will decrease significantly, reducing the preparation efficiency. Therefore, the position needs to be determined by CFD theoretical calculations to establish a uniform flow field, and this position will not cause airflow blockage.

[0058] Example 3

[0059] This invention provides a technical solution:

[0060] A double-loop collision method specifically includes the following steps:

[0061] Step 1: Weigh out a predetermined amount of the original solid particles according to the proportion of different components in the product;

[0062] Step 2: Driven by air source 46, a supersonic circulating airflow is formed in the main circulation pipeline 4;

[0063] Step 3: Add the predetermined amount of raw solid particles into the supersonic circulating airflow of the main circulation pipeline 4;

[0064] Step 4: Solid particles pass through the stabilization section 41, nozzle, and acceleration section 43 in sequence for acceleration, during which random collisions will occur; After the mixed particles pass through the collision chamber 44 and enter the circulation pipe 45, the coarse particles are separated by the particle separation device 1 and enter the secondary circulation pipe 2, while the fine particles return to the upstream of the device through the circulation pipe 45 for re-acceleration.

[0065] The separated coarse particles enter the spiral powder feeding mechanism 3 through the secondary circulation pipe 2, and are sequentially fed to the outlet of the powder feeding pipe 33 by the spiral powder feeding mechanism 3. At the outlet of the powder feeding pipe 33, since there is no airflow acceleration, the coarse particles with low speed collide with the supersonic fine particles that have been accelerated upstream.

[0066] Step 5: The mixed particles after the collision enter the main circulation pipe. The coarse particles are separated by the separation device, and the products that meet the requirements are recovered by the recovery device through the predetermined outlet end of the separation device. The remaining fine particles return to the upstream of the device for re-acceleration.

[0067] Step Six: Repeat steps four and five until all the required products are obtained, then turn off the gas source 46.

[0068] Compared with the traditional single-cycle supersonic airflow acceleration device, this method forms a double-cycle supersonic airflow acceleration device. Through corresponding experimental methods, it improves the velocity difference between solid particles of different components and achieves efficient collision between particles. While the spiral powder feeding mechanism 3 feeds in coarse powder, it also feeds in fine powder upstream of the collision chamber 44. This ensures that the fine particles are in the core flow of the supersonic flow field. After the fine powder is fully accelerated, it directly collides with the coarse powder fed in by the spiral powder feeding device, which ensures a better collision effect between the coarse and fine powders.

[0069] In the existing technology, coarse powder is fed upstream of the collision chamber 44. The coarse powder has a larger particle size and relative mass. Under the action of airflow at the same speed, the acceleration characteristics of coarse powder with the airflow are significantly reduced compared with fine powder, resulting in a significant reduction in collision speed and a substantial decrease in collision efficiency. Taking M=3.0 as an example, when using a method with a fixed target head 47 at one end, the collision speed difference is only 200-300 m / s because the powder is fed into the mixture of coarse and fine powders at the same end. However, when using a separate powder feeding method, under the same conditions, the speed of small particles can reach 500 m / s, while the speed of coarse particles (feeded by a spiral feeding device) is almost 0. The speed difference is greater than 500 m / s, resulting in higher collision efficiency.

[0070] The powder feeding process in this scheme uses a motor-driven screw to rotate, thereby bringing the coarse powder into the circulating reaction device through a counter-current airflow. The powder feeding process should be smooth and unobstructed, and the powder feeding speed should be adjustable. The static pressure at the particle separation device 1 should be higher than the static pressure at the feed port, forming a pressure gradient, which is beneficial for coarse particles to enter the screw powder feeding mechanism 3 along the secondary circulation pipe 2. The arrangement of this scheme is a counter-current airflow, that is, the outlet of the powder feeding pipe 33 faces the direction of the incoming flow in the air source 46-spray pipe-acceleration section 43 pipeline, so as to achieve the collision of coarse and fine particles.

[0071] In this scheme, when coarse and fine particles are first fed into the airflow, they can be fed separately from different positions depending on the design of the inlet, or they can be fed together as a mixture. The only difference is that the former can collide according to the theoretical velocity difference in the early stage of the test, while the latter will collide according to the theoretical velocity difference in the early stage of the test when the particles are not completely separated.

[0072] Meanwhile, a verification experiment was conducted on this scheme:

[0073] Comparative tests were conducted using both the conventional apparatus and the apparatus of this invention, with spherical solid particles of the same proportion under the same experimental conditions (same experimental Mach number, pressure in the stabilization section 41, and experimental time). The comparison results are as follows: Figure 5 and Figure 6As shown, although the surface of the large particle (gray) obtained by the traditional device is uneven, indicating that it has undergone a large number of impacts, almost no small particles (white) are attached to it, indicating that the velocity difference between the large and small particles is insufficient, making it difficult for small particles to embed into large particles. On the contrary, the surface of the large particle (gray) obtained by the device of the present invention is almost covered with small particles (white), and the sphericity of the large particles is also worse, indicating that the velocity difference between the large and small particles is greater, which can better meet the collision energy requirements of small particles.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-loop collision system, characterized in that: The system includes at least a reverse-flow spiral powder feeding device and a main circulation pipeline. The main circulation pipeline includes a stabilization section, a supersonic jet section, an acceleration section, a collision chamber, a circulation pipe, and an air source. The stabilization section, supersonic jet section, acceleration section, and collision chamber are connected sequentially. The circulation pipe is connected to the collision chamber and the stabilization section, respectively. The air source is located on the pipe wall on the side of the stabilization section. The inlet end of the reverse-flow spiral powder feeding device is connected to the circulation pipe, and the outlet end of the reverse-flow spiral powder feeding device is inserted into the collision chamber. The reverse-flow spiral powder feeding device includes a particle separation device, a secondary circulation pipe, and a spiral powder feeding mechanism. The particle separation device is connected to the circulation pipe and has multiple outlets according to different particle sizes, including at least a fine particle outlet, a coarse particle outlet, and a product particle outlet. The coarse particle outlet is connected to the feed end of the spiral powder feeding mechanism, and the fine particle outlet is connected to the circulation pipe. The spiral powder feeding mechanism includes a feeding cylinder, a spiral feeding rod, a powder feeding pipe, and a power mechanism; the spiral feeding rod is sleeved in the powder feeding pipe, the power mechanism is connected to the spiral feeding rod, and the feeding cylinder is disposed on the side wall of the spiral feeding rod near the power mechanism. Coarse particles are separated by a particle separation device and enter the secondary circulation pipe, while fine particles return to the upstream of the system via the circulation pipe for re-acceleration. The separated coarse particles enter the spiral powder feeding mechanism through the secondary circulation pipe and are sequentially fed to the powder feeding pipe outlet by the spiral powder feeding mechanism.

2. The dual-loop collision system as described in claim 1, characterized in that: The power mechanism includes a power source, a central rotating shaft, rolling bearings, and a sealing ring; the power source is connected to the central rotating shaft, and the main body of the spiral powder feeding mechanism is also provided with a rotating cavity for accommodating the rolling bearings. At least two rolling bearings are provided in the rotating cavity, the central rotating shaft is disposed in the rolling bearings, and the sealing ring is disposed on the contact part between the central rotating shaft and the spiral powder feeding mechanism.

3. The dual-loop collision system as described in claim 2, characterized in that: The particle separation device specifically employs a cyclone separator, which can separate particles of different sizes at different outlets based on their mass.

4. The dual-loop collision system as described in claim 3, characterized in that: The central axis of the powder feeding pipe end of the reverse air spiral powder feeding device is coaxially arranged with the pipeline formed by the stabilization section, the supersonic spray pipe section, and the acceleration section.

5. A dual-loop collision system as described in claim 4, characterized in that: The diameter of the powder feeding pipe is the same as the diameter of the gas source output pipe, and the outlet end of the powder feeding pipe is directly opposite the gas source output pipe.

6. The dual-loop collision system as described in claim 5, characterized in that: The location of the powder delivery pipe outlet was determined by establishing a uniform flow field through CFD theoretical calculations.

7. A collision method based on the dual-loop collision system according to any one of claims 1 to 6, characterized in that: Specifically, the following steps are included: Step 1: Weigh out a predetermined amount of the original solid particles according to the proportion of different components in the product; Step 2: Driven by an air source, create a supersonic circulating airflow within the main circulation pipeline; Step 3: Add the predetermined amount of raw solid particles into the supersonic circulating airflow in the main circulation pipeline; Step 4: Solid particles pass through the stabilization section, nozzle, and acceleration section in sequence, during which random collisions will occur; after the mixed particles enter the circulation pipe through the collision chamber, the coarse particles are separated by the particle separation device and enter the secondary circulation pipe, while the fine particles return to the upstream of the system through the circulation pipe for re-acceleration. The separated coarse particles enter the spiral powder feeding mechanism through the secondary circulation pipe and are sequentially fed to the powder feeding pipe outlet. At the powder feeding pipe outlet, since there is no airflow acceleration, the coarse particles with low speed collide with the supersonic fine particles that have been accelerated upstream. Step 5: The mixed particles after the collision enter the circulation pipeline. The coarse particles are separated by the particle separation device. The product that meets the requirements is recovered by the recovery device through the predetermined outlet of the particle separation device. The remaining fine particles return to the upstream of the system for re-acceleration. Step Six: Repeat steps four and five until all the required products are obtained, then turn off the gas supply.

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