High-efficiency solid powder ejector

Abstract

The invention discloses a high-efficiency solid powder ejector which comprises a feeding hopper, a rotational flow distributor, a powder nozzle, a gas phase inlet nozzle, a feeding receiving chamber, a mixing chamber and a mixing outlet pipe. Wherein the feeding funnel, the powder nozzle, the feeding receiving chamber, the mixing chamber and the mixing outlet pipe are sequentially connected along the axis; the cyclone distributor is arranged in the air inlet section of the feeding funnel; and the gas phase inlet nozzle is arranged on the side surface of the feed receiving chamber. By means of the high-efficiency solid powder ejector, the problems that according to an existing solid powder ejector, large-diameter powder is blocked, powder is accumulated in a receiving chamber, the ejection uniformity is poor, and the powder is prone to being bonded are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of injector design, and in particular relates to a high-efficiency solid powder injector. Background Art

[0002] The ejector is a device that uses a certain pressure fluid to eject through a single or multiple nozzles to create a negative pressure environment in the receiving chamber to suck the low-pressure fluid and increase the pressure of the low-pressure fluid. The ejector is reliable, not easy to leak, and easy to maintain. It can be used to suck and pump mud, smoke, and gas loaded with solid powder. Solid powder ejectors are widely used in various industrial fields such as chemical, pharmaceutical, and food.

[0003] Currently, existing solid powder injectors are usually placed horizontally, and the powder is fed through a horizontal upward expansion barrel. This structural design has several problems in actual use:

[0004] (1) Blockage problem of large-diameter powder: Horizontal upward feeding method can easily lead to blockage of large-diameter powder during transportation, especially when the powder contains a lot of large particles. This blockage phenomenon not only affects the injection efficiency, but also may cause equipment damage and increase maintenance costs.

[0005] (2) Powder accumulation in the receiving chamber: Due to the horizontal placement design, powder is easy to accumulate in the receiving chamber of the injector, especially when the powder has poor fluidity. This accumulation will cause uneven injection, affect the injection effect, and increase the difficulty of cleaning and maintenance.

[0006] (3) Poor spraying uniformity: The spraying structure and the way the power gas enters the existing equipment usually cannot ensure the uniform distribution of the powder, resulting in unsatisfactory spraying effect.

[0007] (4) The problem of powder sticking easily: Some powders contain water, which is easy to stick together during the spraying process, causing the powder inside the equipment to stick together, further aggravating the problem of blockage and accumulation, and affecting the continuity and uniformity of the spraying. Summary of the invention

[0008] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art, provides a high-efficiency solid powder injector, and solves the problems of large-diameter powder clogging, powder accumulation in the receiving chamber, poor injection uniformity, and easy adhesion of powder in the existing solid powder injector.

[0009] In order to solve the above technical problems, the present invention discloses a high-efficiency solid powder injector, comprising: a feed funnel, a swirl distributor, a powder nozzle, a gas phase inlet nozzle, a feed receiving chamber, a mixing chamber, and a mixing outlet pipe; wherein the feed funnel, the powder nozzle, the feed receiving chamber, the mixing chamber and the mixing outlet pipe are connected in sequence along an axis; the swirl distributor is arranged in the air inlet section of the feed funnel; and the gas phase inlet nozzle is arranged on the side of the feed receiving chamber.

[0010] In the above-mentioned high-efficiency solid powder injector, the swirl distributor is conical, and a swirl channel extending spirally along the axis of the feed funnel is provided on the outside; wherein the airflow containing solid powder enters the swirl distributor to form a swirl airflow with a certain angle and enters the powder nozzle.

[0011] In the above-mentioned high-efficiency solid powder injector, the spiral angle of the swirl channel of the swirl distributor is 20° to 45°; the cone angle of the swirl air flow section is 20° to 45°

[0012] In the above-mentioned high-efficiency solid powder injector, the powder nozzle is a hollow cavity structure, which includes: a cylindrical air intake section A, a conical contraction section A and a cylindrical throat A in sequence; wherein, the airflow containing solid powder enters the air intake section A of the powder nozzle, and after the airflow velocity is increased by the contraction section A, it is ejected from the throat A.

[0013] In the above-mentioned high-efficiency solid powder injector, the feed receiving chamber is a hollow cavity structure, which includes: a cylindrical air intake section B, a conical contraction section B and a cylindrical throat B in sequence; the powder nozzle is arranged in the hollow cavity of the feed receiving chamber, and the throat A of the powder nozzle and the throat B of the feed receiving chamber form an annular gap throat; wherein, the high-pressure airflow enters the feed receiving chamber through the power air inlet pipe at a certain angle, and is ejected from the annular gap throat, forming a negative pressure area at the outlet of the powder nozzle, so that the airflow containing solid powder is sucked in from the powder nozzle, and the high-pressure airflow and the airflow containing solid powder are compressed and mixed in the mixing chamber and discharged through the mixing outlet pipe.

[0014] In the above high-efficiency solid powder injector, the contraction angle of the annular gap throat is 5° to 35°.

[0015] In the above-mentioned high-efficiency solid powder injector, the mixing chamber is a hollow cavity structure, which includes: a mixing contraction section, a mixing throat and a mixing diffusion section in sequence; wherein, the high-pressure airflow and the airflow containing solid powder enter the mixing contraction section of the mixing chamber, are compressed and mixed in the mixing throat, and are pressurized in the mixing diffusion section before being discharged from the mixing outlet pipe.

[0016] In the above-mentioned high-efficiency solid powder injector, the cone angle β of the mixing diffusion section of the mixing chamber is 5° to 20°; the cross-sectional area f of the mixing throat of the mixing chamber perpendicular to the axis direction of the solid powder injector hf is the cross-sectional area of ​​the powder nozzle throat A perpendicular to the axis of the solid powder injector n The length Lh of the mixing throat of the mixing chamber is 2.3 to 5.5 times the inner diameter of the mixing throat of the mixing chamber.

[0017] In the above high-efficiency solid powder injector, the feed funnel is conical, and the cone angle α is 10° to 60°.

[0018] In the above-mentioned high-efficiency solid powder injector, the angle between the axis of the gas phase inlet nozzle and the axis of the solid powder injector is 45 to 80 degrees.

[0019] The present invention has the following advantages:

[0020] (1) The present invention discloses a high-efficiency solid powder injector, which effectively solves the problems of large-particle powder accumulation and powder adhesion. It can greatly save energy consumption, reduce equipment size, reduce primary investment and operating costs, has a wide range of application prospects, and has the advantages of simple structure, uniform injection, not easy to clog, and easy maintenance.

[0021] (2) The present invention discloses a high-efficiency solid powder injector, which is arranged vertically. Different from the traditional injector in which the air is sucked from a straight pipe section, in the high-efficiency solid powder injector of the present invention, the sucked air containing solid powder is ejected through a powder nozzle in the form of a Laval nozzle, thereby reducing powder adhesion and improving injector stability.

[0022] (3) The present invention discloses a high-efficiency solid powder injector, in which a gas phase inlet nozzle injects power gas at a certain angle. Different from a conventional injector, in the high-efficiency solid powder injector of the present invention, the power gas is ejected from the center of a feed receiving chamber through a Laval nozzle, and the power gas enters the feed receiving chamber through the gas phase inlet nozzle at a certain angle, and is ejected from the throat of the annular gap formed between the feed receiving chamber and the powder nozzle. The advantage of this design is that it can reduce the pressure loss caused by the power gas vertically impacting the feed receiving chamber; the power gas at a certain angle is ejected through the throat of the annular gap to effectively mix the airflow containing solid powder with the solid powder; the power gas ejected from the throat of the annular gap covers the inner wall of the mixing section, which can effectively reduce the adhesion of the powder to the wall of the mixing section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a high-efficiency solid powder injector in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] One of the core ideas of the present invention is that currently existing solid powder injectors are usually placed horizontally, and the powder is fed through a horizontally upward expansion barrel. This structural design has several problems in actual use: (1) large diameter powder blockage problem; (2) powder accumulation problem in the receiving chamber; (3) poor injection uniformity problem; (4) powder easy to stick together. In order to solve the above problems, the present invention discloses a high-efficiency solid powder injector, which is installed vertically. The power gas enters the injector from the side at an oblique angle, and a swirl distributor is installed in the feed funnel. The rotating airflow is used to effectively prevent powder accumulation and blockage. The airflow containing solid powder is ejected from the center through the Laval nozzle, and the power gas is ejected from the throat of the annular gap to guide the solid powder airflow to prevent the solid powder from sticking to the wall of the injector, thereby improving the injection efficiency.

[0026] Reference Figure 1 In this embodiment, the high-efficiency solid powder injector comprises: a feed hopper 1, a swirl distributor 2, a powder nozzle 3, a gas phase inlet nozzle 4, a feed receiving chamber 5, a mixing chamber 6, and a mixing outlet pipe 7. The feed hopper 1, the powder nozzle 3, the feed receiving chamber 5, the mixing chamber 6, and the mixing outlet pipe 7 are sequentially connected along the axis; the swirl distributor 2 is arranged in the air inlet section of the feed hopper 1; and the gas phase inlet nozzle 4 is arranged on the side of the feed receiving chamber 5.

[0027] In this embodiment, the feed funnel 1 is conical, and the cone angle α is 10° to 60°.

[0028] In this embodiment, the swirl distributor 2 can be fixed in the air inlet section of the feed funnel 1 by welding. The swirl distributor 2 is conical, and a swirl channel is provided on the outside that spirally extends along the axis of the feed funnel 1, and the spiral angle of the swirl channel is 20° to 45°. Among them, the airflow containing solid powder enters the swirl distributor 2 to form a swirl airflow with a certain angle (the cone angle of the swirl airflow cross section is 20° to 45°) and enters the powder nozzle 3, which increases the contact area between the airflow containing solid powder and the high-pressure airflow; the swirling airflow can effectively disperse the solid powder, prevent the solid powder from accumulating, bonding and clogging in the solid powder injector, and ensure the suction effect.

[0029] In this embodiment, the powder nozzle 3 is a hollow cavity structure, which includes: a cylindrical air intake section A, a conical contraction section A and a cylindrical throat A. The airflow containing solid powder enters the air intake section A of the powder nozzle 3, and is ejected from the throat A after the airflow velocity is increased by the contraction section A.

[0030] In this embodiment, the angle between the axis of the gas phase inlet nozzle 4 and the axis of the solid powder injector is 45-80°. The gas phase can be compressed air, propylene vapor or other gases.

[0031] In this embodiment, the feed receiving chamber 5 is a hollow cavity structure, which includes: a cylindrical air intake section B, a conical contraction section B and a cylindrical throat B in sequence; the powder nozzle 3 is arranged in the hollow cavity of the feed receiving chamber 5, and the throat A of the powder nozzle 3 and the throat B of the feed receiving chamber 5 form an annular gap throat. Among them, the high-pressure airflow enters the feed receiving chamber 5 through the power gas inlet pipe 4 at a certain angle, and is ejected from the annular gap throat, forming a negative pressure area at the outlet of the powder nozzle 3, so that the airflow containing solid powder is sucked in from the powder nozzle 3, and the high-pressure airflow and the airflow containing solid powder are compressed and mixed in the mixing chamber 6, and then discharged through the mixing outlet pipe 7. The contraction angle of the annular gap throat is 5° to 35°.

[0032] In this embodiment, the mixing chamber 6 is a hollow cavity structure, which includes: a mixing contraction section, a mixing throat and a mixing diffusion section. The high-pressure airflow and the airflow containing solid powder enter the mixing contraction section of the mixing chamber 6, are compressed and mixed in the mixing throat, and are pressurized in the mixing diffusion section before being discharged from the mixing outlet pipe 7. The cone angle β of the mixing diffusion section of the mixing chamber 6 is 5° to 20°; the cross-sectional area f of the mixing throat of the mixing chamber 6 perpendicular to the axis of the solid powder injector is h is the cross-sectional area f of the throat A of the powder nozzle 3 perpendicular to the axis of the solid powder injector n 6 mixing throat length Lh of the mixing chamber 6 is 2.3 to 5.5 times the inner diameter of the mixing throat of the mixing chamber 6.

[0033] In summary, the present invention discloses a high-efficiency solid powder injector, which introduces a swirl distributor into the powder nozzle to form a swirl airflow with a certain angle at the outlet of the powder nozzle; with the improvement of the injector structure design and the injection method, the airflow containing the solid powder is ejected from the central axis of the injector, and with the power gas entering the injector at an oblique angle, the problems of clogging of large-diameter powder, accumulation of powder in the receiving chamber, poor injection uniformity and easy adhesion of powder are solved.

[0034] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0035] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A high-efficiency solid powder injector, characterized in that: include: A feed hopper (1), a swirl distributor (2), a powder nozzle (3), a gas phase inlet nozzle (4), a feed receiving chamber (5), a mixing chamber (6), and a mixing outlet pipe (7); wherein the feed hopper (1), the powder nozzle (3), the feed receiving chamber (5), the mixing chamber (6), and the mixing outlet pipe (7) are connected in sequence along an axis; the swirl distributor (2) is arranged in the air inlet section of the feed hopper (1); and the gas phase inlet nozzle (4) is arranged on the side of the feed receiving chamber (5).

2. The high-efficiency solid powder injector according to claim 1, characterized in that: The swirl distributor (2) is conical, and is provided with a swirl channel on the outside that spirally extends along the axis of the feed funnel (1); wherein the airflow containing solid powder enters the swirl distributor (2) to form a swirl airflow with a certain angle and enters the powder nozzle (3).

3. The high-efficiency solid powder injector according to claim 2, characterized in that: The spiral angle of the swirl channel of the swirl distributor (2) is 20° to 45°; and the cone angle of the swirl airflow cross section is 20° to 45°.

4. The high-efficiency solid powder injector according to claim 1, characterized in that: The powder nozzle (3) is a hollow cavity structure, which comprises in sequence: a cylindrical air intake section A, a conical contraction section A and a cylindrical throat A; wherein an airflow containing solid powder enters the air intake section A of the powder nozzle (3), is accelerated by the contraction section A, and is then ejected from the throat A.

5. The high-efficiency solid powder injector according to claim 4, characterized in that: The feed receiving chamber (5) is a hollow cavity structure, which comprises: a cylindrical air intake section B, a conical contraction section B and a cylindrical throat B in sequence; the powder nozzle (3) is arranged in the hollow cavity of the feed receiving chamber (5), and the throat A of the powder nozzle (3) and the throat B of the feed receiving chamber (5) form an annular gap throat; wherein the high-pressure airflow enters the feed receiving chamber (5) through the power air inlet pipe (4) at a certain angle and is ejected from the annular gap throat, forming a negative pressure area at the outlet of the powder nozzle (3), so that the airflow containing solid powder is sucked in from the powder nozzle (3), and the high-pressure airflow and the airflow containing solid powder are compressed and mixed in the mixing chamber (6) and discharged through the mixing outlet pipe (7).

6. The high-efficiency solid powder injector according to claim 5, characterized in that: The contraction angle of the annular gap throat is 5° to 35°.

7. The high-efficiency solid powder injector according to claim 5, characterized in that: The mixing chamber (6) is a hollow cavity structure, which comprises in sequence: a mixing contraction section, a mixing throat and a mixing diffusion section; wherein the high-pressure airflow and the airflow containing solid powder enter the mixing contraction section of the mixing chamber (6), are compressed and mixed in the mixing throat, and are pressurized in the mixing diffusion section before being discharged from the mixing outlet pipe (7).

8. The high-efficiency solid powder injector according to claim 7, characterized in that: The cone angle β of the mixing diffusion section of the mixing chamber (6) is 5° to 20°; the cross-sectional area f of the mixing throat of the mixing chamber (6) perpendicular to the axis of the solid powder injector h is the cross-sectional area f of the throat A of the powder nozzle (3) perpendicular to the axis of the solid powder injector n The length Lh of the mixing throat of the mixing chamber (6) is 2.3 to 5.5 times the inner diameter of the mixing throat of the mixing chamber (6).

9. The high-efficiency solid powder injector according to claim 1, characterized in that: The feed funnel (1) is conical, and the cone angle α is 10° to 60°.

10. The high-efficiency solid powder injector according to claim 1, characterized in that: The angle between the axis of the gas phase inlet nozzle (4) and the axis of the solid powder injector is 45 to 80 degrees.

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