A gas-solid mixed micro-particle transport system

Abstract

A kind of gas-solid mixed micro-particle transport system, including airflow supply assembly, particle delivery assembly and gas-solid mixing assembly, the high-pressure pipeline of airflow supply assembly provides high-pressure airflow for gas-solid mixing assembly, low-pressure pipeline provides low-pressure airflow for particle delivery assembly;Particle delivery assembly is provided with sandblasting gun, material particles and low-pressure airflow enter gas-solid mixing assembly through the nozzle of sandblasting gun;Gas-solid mixing assembly includes high-pressure pipe section, particle mixing chamber and discharge pipeline, the inlet of high-pressure pipe section is communicated with high-pressure pipeline, the lower part of high-pressure pipe section and particle mixing chamber inner wall form the annular mixing cavity with bottom open, the lower end outlet of high-pressure pipe section is the structure of reducing diameter, and gap is left between it and discharge pipeline inlet;Particle mixing chamber side is provided with tangential inlet connected with sandblasting gun;The screen is arranged in the annular mixing cavity, and the screen allows material particles to pass through, and the screen is radially parallel with the annular mixing cavity.This application can guarantee the uniformity of gas-solid mixing, simple structure, easy operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of multiphase flow, and particularly relates to a gas-solid mixed micro-particle transport system. BACKGROUND

[0002] Particle transport is widely used in scientific research fields such as energy, chemical industry, aerospace and pharmaceutical industry, and problems such as continuous addition of solid particles in gas phase and controllable particle concentration have not been well solved. At present, the existing particle transport methods in China mainly include pneumatic transport method and spiral feeding method.

[0003] The pneumatic transport method refers to that gas flows through a particle storage chamber, and solid particles are carried by the gas to form a gas-solid mixed jet. This method cannot control the particle concentration and cannot guarantee the uniformity of the mixture. The spiral feeding method uses a spiral conveyor belt to send solid particles into a jet pipe, and also cannot guarantee the uniformity of the mixture. Meanwhile, if the gas pressure in the gas phase jet is high, the particles may stop feeding or even flow in reverse during the pneumatic transport or spiral feeding process.

[0004] Therefore, it is necessary to design a gas-solid mixed micro-particle transport system which is uniform in mixing and controllable in particle concentration. SUMMARY

[0005] The purpose of the present application is to provide a gas-solid mixed micro-particle transport system which is simple and stable, fully mixed in particles and controllable in concentration.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a gas-solid mixed micro-particle transport system, comprising a gas flow supply assembly, a particle conveying assembly and a gas-solid mixing assembly, the gas flow supply assembly comprising a high-pressure pipeline and a low-pressure pipeline, the high-pressure pipeline providing high-pressure gas flow for the gas-solid mixing assembly, and the low-pressure pipeline providing low-pressure gas flow for the particle conveying assembly;

[0007] The particle conveying assembly is provided with a sandblasting gun, the gas inlet of the sandblasting gun is connected with the low-pressure pipeline, the material inlet of the sandblasting gun is used for receiving material particles to be mixed, the material particles and the low-pressure gas flow enter the gas-solid mixing assembly through the nozzle of the sandblasting gun;

[0008] The gas-solid mixing assembly comprises a high-pressure pipe section, a particle mixing chamber and a discharge pipeline, the inlet of the high-pressure pipe section is communicated with the high-pressure pipeline, the lower part of the high-pressure pipe section is arranged in the particle mixing chamber to form an annular mixing cavity with an open bottom, the lower end outlet of the high-pressure pipe section is of a reduced diameter structure, and a gap is left between the lower end outlet and the inlet of the discharge pipeline; the upper part of the side surface of the particle mixing chamber is provided with a tangential inlet, the nozzle of the sandblasting gun is communicated with the annular mixing cavity through the tangential inlet; a screen mesh allowing the material particles to pass through is arranged in the annular mixing cavity, and the screen mesh is parallel to the radial direction of the annular mixing cavity; the discharge pipeline is connected with the lower end of the particle mixing chamber through an adapter.

[0009] The high-pressure pipe section comprises a gas inlet pipe, a high-pressure straight pipe section and a conical accelerating pipe connected in sequence, the large-diameter end of the conical accelerating pipe is connected with the high-pressure straight pipe section, and the small-diameter end faces the inlet of the discharge pipe.

[0010] The upper end of the high-pressure straight pipe section is connected with the particle mixing chamber through an upper adapter.

[0011] The upper adapter is a cylindrical structure provided with a central hole, the lower end of the upper adapter is a connecting end, an annular connecting groove is arranged on the upper adapter, the inner circular surface of the connecting groove is threadedly connected with the high-pressure straight pipe section, and the outer circular surface of the connecting groove is threadedly connected with the particle mixing chamber; the gas inlet pipe is connected with the central hole and communicates with the high-pressure straight pipe section through the central hole.

[0012] The lower end of the particle mixing chamber is connected with the discharge pipe through a lower adapter.

[0013] The lower adapter has a conical structure with a large upper end and a small lower end, and the small-diameter end of the conical accelerating pipe terminates at the bottom of the conical structure.

[0014] The screen is provided with two pieces and is symmetrically arranged in the annular mixing chamber.

[0015] The particle conveying assembly further comprises a particle storage bin and a feeder, and the feeder feeds the material particles into the sand blasting gun.

[0016] The feeder is a vibrating feeder.

[0017] A solid flow meter is arranged on the discharge pipe, and the solid flow meter is connected with a computer signal.

[0018] The present application has the advantages that the present application uses a screen in the mixing chamber to ensure the uniformity of solid particles, utilizes a gas accelerating pipe to generate a Venturi effect, and enables the particles in the mixing chamber to automatically enter the high-speed airflow under the action of negative pressure and gravity, so that the operation is simple and convenient and the cost is low.

[0019] The present application separates the feeding system from the high-pressure airflow, avoids the phenomenon that the particles stop feeding or even flow in the opposite direction during the feeding process, utilizes a low-pressure airflow and a sand blasting gun in combination, enables the particles to smoothly enter the sand blasting gun under the action of the pressure difference, and ensures the continuity of the particle addition through the application of the sand blasting gun.

[0020] The present application uses a real-time monitoring and feedback system, adjusts the frequency of the vibrating feeder motor to adjust the solid particle concentration, makes the solid particle concentration of the gas-solid mixture in the discharge pipe more accurate and controllable, and improves the reproducibility of the experiment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The present application is a structural schematic diagram;

[0022] Figure 2 This is a schematic diagram of the conical nozzle structure in this invention;

[0023] Figure 3 This is a schematic diagram of the sandblasting gun in this invention;

[0024] Figure 4 This is a cross-sectional view of the adapter in this invention;

[0025] The diagram is labeled as follows: 1. High-pressure air source, 2. Solenoid valve A, 3. Flow meter A, 4. Low-pressure air source, 5. Solenoid valve B, 6. Flow meter B, 7. Sandblasting gun, 701. Gas inlet, 702. Material inlet, 703. Nozzle, 8. Particle storage bin, 9. Vibrating feeder, 10. Upper adapter, 1001. Center hole, 1002. Connecting groove, 11. High-pressure straight tube, 12. Particle mixing chamber, 13. Screen, 14. Conical acceleration tube, 15. Negative pressure zone, 16. Solid flow meter, 17. Discharge pipe, 18. Computer, 19. Lower adapter. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the invention in any way.

[0027] See attached document Figures 1-4 As shown, a gas-solid mixing microparticle transport system includes an airflow supply component, a particle conveying component, a gas-solid mixing component, and a particle concentration detection device. Utilizing the venturi effect generated by the conical acceleration pipe 14, solid particles in the mixing chamber are automatically added to the high-speed jet under negative pressure and gravity, and are ejected together from the discharge pipe 17. Simultaneously, a solid flow meter 16 monitors the outlet particle concentration in real time.

[0028] The airflow supply assembly includes a high-pressure pipeline and a low-pressure pipeline. One end of the high-pressure pipeline is connected to the high-pressure air source 1, and the other end is connected to the high-pressure straight tube 4 through an air inlet pipe. A solenoid valve A2 and a flow meter A3 are installed on the high-pressure pipeline. The high-pressure airflow flows to the high-pressure straight tube 4 after passing through the flow meter A3. One end of the low-pressure pipeline is connected to the low-pressure air source 4, and the other end is connected to the gas inlet 701 of the sandblasting gun 7. A solenoid valve B5 and a flow meter B6 are installed on the low-pressure pipeline. The low-pressure airflow flows to the sandblasting gun 7 after passing through the flow meter B6.

[0029] The particle conveying assembly includes a sandblasting gun 7, a particle storage bin 8, and a vibrating feeder 9. The nozzle 703 of the sandblasting gun 7 is connected to the particle mixing chamber 12 of the gas-solid mixing assembly. The material in the particle storage bin 8 falls into the material inlet 702 of the sandblasting gun 7 below via the vibrating feeder 9.

[0030] The gas-solid mixing assembly comprises a high-pressure straight cylinder pipe 11, a particle mixing chamber 12, a screen 13, a conical accelerating pipe 14, a negative pressure area 15 and a discharge pipe 17. The high-pressure straight cylinder pipe 11 is arranged in the particle mixing chamber 12 and coaxially arranged with the particle mixing chamber 12, and fixedly connected through an upper adapter 10. The structure of the upper adapter 10 is shown in Figure 4 The high-pressure pipe connected with the gas inlet pipe is inserted into the central hole 1001 of the upper adapter 10 and sealed, the connecting end of the upper adapter 10 is provided with an annular connecting groove 1002, the inner ring of the connecting groove 1002 is provided with external threads for threadedly connecting with the end of the high-pressure straight cylinder pipe 11, and the outer ring of the connecting groove 1002 is provided with internal threads for threadedly connecting with the end of the particle mixing chamber 12. The screen 13 is provided with two pieces and symmetrically arranged in the annular space between the high-pressure straight cylinder pipe 11 and the particle mixing chamber 12, and the screen surface of the screen 13 is radially arranged along the annular space. In order to avoid the blocking of the material particles at the screen holes, the diameter of the screen holes is greater than the particle size of the material particles, and preferably, the ratio of the material particles to the screen hole diameter is 1:35-1:40. The screen is arranged to disperse the agglomerated particles. The nozzle 703 of the sandblasting gun 7 is tangentially connected with the side wall of the particle mixing chamber 12. The particles enter the annular space of the particle mixing chamber 12 along with the low-pressure gas flow and rotate downward. In the process of passing through the screen 13, the screen 13 can reduce the agglomeration between the particles, which is beneficial to the mixing of the gas and the particles. The upper end of the conical accelerating pipe 14 is a large-diameter straight pipe and threadedly connected with the lower end of the high-pressure straight cylinder pipe 11, the lower end is a small-diameter straight pipe, the small-diameter end is opposite to the inlet of the discharge pipe 17 and spaced apart from the inlet of the discharge pipe 17, and the two straight pipe sections are connected by a conical section. The discharge pipe 17 is connected with the particle mixing chamber 12 through a lower adapter 19. The upper end and the lower end of the lower adapter 19 are provided with straight pipe sections and internal threads, respectively. The space between the conical section of the middle part of the lower adapter 19 and the conical accelerating pipe 14 is a negative pressure area 15 formed when the high-pressure gas flow flows out of the conical accelerating pipe 14. The high-pressure gas flow and the particle material flow into the discharge pipe 17 below at the outlet of the conical accelerating pipe 14.

[0031] Further, the small-diameter end of the conical accelerating pipe 14 extends to the bottom of the conical structure of the lower adapter 19, which ensures that the material particles are always separated from the high-pressure gas flow before reaching the gap between the small-diameter end of the conical accelerating pipe 14 and the discharge pipe 17, thereby avoiding the influence of the high-pressure gas flow on the feeding of the material.

[0032] The particle concentration detection device comprises a solid flow meter 16 and a computer 18. The solid flow meter 16 is arranged on the discharge pipe 17, and the computer 18 is used to process the flow meter signal to achieve real-time monitoring. The pipe wall of the discharge pipe 17 is perforated, the solid flow meter 16 is inserted into the pipe and parallel to the pipe.

[0033] The gas-solid mixed micro-particle transport system works as follows:

[0034] First, open the flow meter A3, flow meter B6, solid flow meter 16, and computer 18. Assume that the required solid particle concentration in this example is (kg / m 3 ), the volume flow rate of the high-pressure jet is Q a (m 3 / s) , the volume flow rate of the low-pressure jet is Q b (m 3 / s) , the total mass required after the particle transport system works for a certain time t, so the addition rate of the solid particles can be determined. In this example, the vibration frequency of the vibrating feeder 9 is used to control the addition rate of the particles, so the frequency of the vibrating machine can be determined according to the required solid particle concentration.

[0035] Then, open the electromagnetic valve A2 and electromagnetic valve B5, adjust the opening of the electromagnetic valve according to the flow meter reading, add the appropriate amount of solid particles in the particle storage bin 8, and open the vibrating feeder 9. The gas flow to the high-pressure straight tube section 11 forms a high-speed jet into the discharge pipe 17 through the conical accelerating tube 14 and forms a negative pressure area; the particles are transported to the sandblasting gun 7 through the vibrating feeder 9 and enter the particle mixing chamber 12 with the low-pressure gas flow. Under the action of negative pressure and gravity, the particles spiral downward along the inner wall of the particle mixing chamber 12, and after being fully mixed with the gas under the action of the screen 13, they are added to the high-speed jet. The solid flow meter 16 is used to monitor the particle concentration in the gas-solid mixed jet in real time, and the vibration frequency of the vibrating feeder 9 is adjusted according to the signal to control the solid particle concentration.

[0036] Other embodiments: The above-described embodiments are the preferred mode, and in actual use, the structure can be appropriately changed and adjusted. For example, in the above-described embodiment, the high-pressure straight tube is connected to an air inlet pipe through an adapter and connected to the high-pressure pipeline from the air inlet pipe, and the lower end of the high-pressure straight tube is connected to the conical accelerating tube. The advantage is that it is convenient to disassemble, maintain, and replace. However, the joint needs to be sealed, so in practice, the parts can be made into a whole structure, the upper part is connected to the high-pressure pipeline, the lower part is arranged in the particle mixing chamber, which is equivalent to the high-pressure straight tube of the split structure, and the lower end opening is arranged as a reduced diameter structure, which is equivalent to the conical accelerating tube of the split structure, which can also play the role of the split structure. The advantage is that it is integral, and there is no need to consider the sealing problem between the sections.

[0037] The above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. It should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently with reference to the above examples, and any modification or equivalent replacement without departing from the spirit and scope of the present application is within the protection scope of the claims of the application.

Claims

1. A gas-solid mixed microparticle transport system, comprising an airflow supply component, a particle conveying component, and a gas-solid mixing component, characterized in that: The airflow supply assembly includes a high-pressure pipeline and a low-pressure pipeline. The high-pressure pipeline provides high-pressure airflow to the gas-solid mixing assembly, and the low-pressure pipeline provides low-pressure airflow to the particle conveying assembly. The particle conveying assembly is equipped with a sandblasting gun. The gas inlet of the sandblasting gun is connected to a low-pressure pipeline. The material inlet of the sandblasting gun is used to receive the material particles to be mixed. The material particles and the low-pressure airflow enter the gas-solid mixing assembly through the nozzle of the sandblasting gun. The gas-solid mixing assembly includes a high-pressure pipe section, a particle mixing chamber, and a discharge pipe. The inlet of the high-pressure pipe section is connected to the high-pressure pipeline. The lower part of the high-pressure pipe section is located in the particle mixing chamber to form an open-bottomed annular mixing cavity. The lower outlet of the high-pressure pipe section has a narrowed diameter structure, and a gap is left between the lower outlet and the inlet of the discharge pipe. A tangential inlet is provided on the upper part of the side of the particle mixing chamber, and the nozzle of the sandblasting gun is connected to the annular mixing cavity through the tangential inlet. A screen with mesh openings that allows material particles to pass through is provided in the annular mixing cavity, and the screen is parallel to the radial direction of the annular mixing cavity. The discharge pipe is connected to the lower end of the particle mixing chamber through an adapter. The high-pressure pipe section includes an air inlet pipe, a high-pressure straight cylinder section, and a conical accelerating pipe connected in sequence. The large-diameter end of the conical accelerating pipe is connected to the high-pressure straight cylinder section, and the small-diameter end faces the inlet of the discharge pipe. The lower end of the particle mixing chamber is connected to the discharge pipe through a lower adapter. The lower adapter has a conical structure with a larger upper part and a smaller lower part in the middle. The small-diameter end of the conical accelerating pipe terminates at the bottom of the conical structure. The lower end of the screen of the annular mixing chamber is higher than the lower end of the small-diameter end of the conical accelerating pipe.

2. The gas-solid mixed microparticle transport system according to claim 1, characterized in that: The upper end of the high-pressure straight cylinder section and the particle mixing chamber are connected by an upper adapter.

3. The gas-solid mixed microparticle transport system according to claim 2, characterized in that: The upper adapter is a cylindrical structure with a central hole. The lower end of the upper adapter is the connecting end, which is provided with an annular connecting groove. The inner circular surface of the connecting groove is threaded to the high-pressure straight cylinder section, and the outer circular surface of the connecting groove is threaded to the particle mixing chamber. The air inlet pipe is connected to the central hole and communicates with the high-pressure straight cylinder section through the central hole.

4. The gas-solid mixed microparticle transport system according to claim 1, characterized in that: The screen consists of two pieces, symmetrically arranged in the annular mixing chamber.

5. The gas-solid mixed microparticle transport system according to claim 1, characterized in that: The particle conveying assembly also includes a particle storage bin and a feeder, which feeds the material particles into the sandblasting gun.

6. The gas-solid mixed microparticle transport system according to claim 5, characterized in that: The feeder is a vibrating feeder.

7. The gas-solid mixed microparticle transport system according to claim 1, characterized in that: A solid flow meter is installed on the discharge pipe, and the solid flow meter is connected to the computer signal.

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