Novel gas-solid ejector capable of preventing dust accumulation

Abstract

The invention relates to the technical field of industrial dust removal and environmental protection, in particular to a novel gas-solid ejector capable of preventing dust accumulation, which mainly comprises a nozzle, a receiving chamber, a mixing pipe and a diffuser pipe. On one hand, the speed of working fluid sprayed out of the nozzle can be remarkably increased, the pressure difference in a receiving chamber is increased, an ejection working medium falling from a feeding port obtains higher driving force, and it is ensured that the substances can completely flow into a mixing chamber along with the working fluid as much as possible; on the other hand, due to the special inclination angle design of the reducing pipeline, the materials falling on the pipeline naturally flow to the mixing chamber under the traction of gravity, accumulation of the materials in the mixing chamber is effectively avoided, in addition, the area where the lower wall of the inner cavity of the receiving chamber is connected with the reducing pipeline and the lower edge of the nozzle is designed to be of a solid structure, and the structure is simple. And dust particles are ingeniously prevented from being deposited in the region.

Description

Technical Field

[0001] The invention relates to the technical field of industrial dust removal and environmental protection, and in particular to a novel gas-solid ejector for preventing dust accumulation. Background Art

[0002] Since the 1920s, pneumatic conveying technology has made great progress and has been widely used in the fields of petroleum, chemical industry, food, transportation and power stations. Among them, gas-solid ejectors, as key equipment for pneumatic conveying feeding, are widely used in cyclone separator systems because of their simple structure, convenient operation and easy maintenance. However, with the increasing requirements for dust removal equipment in industrial production, especially in environments with high dust concentration and complex airflow characteristics, the dust outlet of traditional cyclone separators often faces blockage problems. As the key equipment for transporting particles at the dust outlet of the cyclone separator, in order to prevent the clogging problem of the dust outlet of the cyclone separator, the stability of the performance and the efficiency of the gas-solid ejectors have gradually become hot issues for research.

[0003] Although gas-solid injectors have been widely used, there are still some problems in actual production, such as equipment failure, unstable performance, wear and corrosion, and high energy consumption. Among them, cavity blockage is one of the main causes of these problems. The blockage problem is often closely related to the structural design of the gas-solid injector, such as the shape, size, length and diameter of the inner cavity of the nozzle. These design parameters directly affect the flow state and deposition behavior of the particles inside the injector. Although there have been some related studies on the blockage problem of gas-solid injectors, most of them focus on operating parameters, material characteristics, etc., and there are relatively few studies on the improvement of structural design. Since the existing gas nozzle is generally directly located on the same axis as the receiving chamber, and the outlet end of the nozzle and the outlet end of the blanking port are set at one place, the material accumulates here, which will increase the risk of blockage of the gas-solid injector, thereby affecting the separation efficiency and durability of the equipment.

[0004] Therefore, in view of the imperfections in the structural design, size and arrangement of the components of the above-mentioned gas-solid injector, which lead to the problem that the cavity is easily blocked during operation, a new gas-solid injector that prevents dust accumulation can be designed. Summary of the invention

[0005] In order to overcome the imperfections in the existing gas-solid ejector structure design, the size of each component and the arrangement method, which leads to the problem that the cavity is easily blocked during operation.

[0006] The technical solution of the present invention is: a new type of gas-solid injector for preventing dust accumulation, including an air inlet, a convergent tube, a nozzle, a receiving chamber, a blanking port, a mixing tube, a pressure diffuser, a solid area, and a discharge port. A receiving chamber is arranged at the right end of the air inlet, a solid area is arranged at the lower end of the inner wall of the receiving chamber, the upper end of the solid area is connected with a convergent tube, the right end of the convergent tube is arranged with a nozzle, the upper end of the receiving chamber is connected with the blanking port, the end of the receiving chamber away from the air inlet is connected with a mixing tube, the right end of the mixing tube is connected with a pressure diffuser, and the right end of the pressure diffuser is arranged with a discharge port.

[0007] Preferably, high-pressure gas is used as the working fluid, and the pressure is reduced and the speed is increased after passing through the nozzle, so that the working fluid entering the receiving chamber reaches supersonic or subsonic speed; a blanking port is provided above the receiving chamber, and after the ejected working fluid enters the receiving chamber from the blanking port, it enters the mixing tube under the pressure difference and the suction effect of the high-speed fluid to undergo intense mixing, exchange velocity and momentum, the velocity field tends to be balanced, and the pressure gradually increases. At the outlet of the mixing tube, the mixture enters the diffuser tube, the velocity of the mixture decreases, the pressure gradually increases, and under the final pressure difference, the mixture is ejected from the ejector at a certain speed. By designing the gas inlet pipe section connected to the nozzle as a tapered pipe section, not only can the fluid be accelerated, but also due to the inclination angle of the tapered pipe section, dust particles can be effectively prevented from accumulating on the pipe section; and the area between the lower half of the outer wall of the gas nozzle and its connected pipe section to the lower wall of the inner cavity of the receiving chamber, and the area from the lower edge of the nozzle to the connecting line of the mixing tube inlet and below it are designed as a solid area to prevent dust from accumulating in the cavity of the receiving chamber. The present invention utilizes the gas-solid two-phase flow principle, uses fluidization technology, combines the jet technology and the pressure difference principle, and solves the problems of low particle transport efficiency at the cyclone separator outlet, easy blockage of the ejector, and the need to shut down for cleaning before normal operation.

[0008] Preferably, the area between the lower wall of the inner cavity of the receiving chamber and the lower half outer wall of the nozzle and its connected tapered tube is a solid area, and the area from the lower edge of the nozzle to the line connecting the mixing tube inlet and the area below it is also a solid area.

[0009] Preferably, the inner cavity of the receiving chamber adopts a Venturi tube shape, that is, a cylindrical cavity is connected to a frustoconical cavity, the diameter of the end point of the tapered section of the frustoconical cavity is the same as the diameter of the mixing tube, the length of the cylindrical cavity section is 0.1873m, the diameter is 0.102m, the length of the frustoconical cavity section is 0.0614m, its inlet diameter is the same as that of the cylindrical section, and the outlet diameter is the same as that of the mixing tube.

[0010] Preferably, the air inlet pipe section connected to the nozzle is a tapered pipe section with an inlet diameter of 0.0615m and an outlet diameter of 0.0441m. The nozzle height is located on the central axis of the inner cavity of the receiving chamber and the horizontal position is located at the beginning of the tapered section of the inner cavity of the receiving chamber.

[0011] Preferably, the material drop opening is located on the upper wall of the inner cavity of the receiving chamber, the inner diameter of the material drop opening is the same as the outer diameter of the dust discharge port of the cyclone separator connected thereto, and the diameter of the material drop opening is 0.105m.

[0012] Preferably, the diameter of the mixing tube is the same as the maximum circular diameter formed by the jet ejected from the nozzle, the diameter of the mixing tube is 0.06756 m, and the length of the mixing tube is about 8 times its diameter.

[0013] Preferably, the inlet diameter of the diffuser is the same as that of the mixing tube, the diameter of the diffuser increases gradually from left to right, the outlet diameter of the diffuser is 0.203 m, and the length of the diffuser is 1 / 2 of the length of the mixing tube.

[0014] Beneficial effects of the present invention: The new gas-solid ejector for preventing dust accumulation adopts a tapered pipe to introduce the working gas into the receiving chamber, and its purpose is to improve the efficiency in a dual way: on the one hand, it can significantly increase the speed of the working fluid when it is ejected from the nozzle, increase the pressure difference in the receiving chamber, and thus make the ejected working fluid falling from the feed port obtain a stronger driving force, ensuring that these substances can flow into the mixing chamber as completely as possible along with the working fluid; on the other hand, due to its unique inclination angle design, the tapered pipe makes the material falling on the pipe flow naturally to the mixing chamber under the traction of gravity, effectively avoiding the accumulation of materials here, in addition, the lower wall of the inner cavity of the receiving chamber and the area where the tapered pipe and the lower edge of its nozzle are connected are designed as a solid structure, which cleverly prevents dust particles from depositing in this area, significantly reducing the risk of clogging of the gas-solid ejector. Therefore, the present device is not only simple in structure and easy to implement at the operational level, but also effectively solves the problem of clogging inside the cavity during operation due to structural design, greatly improving the dust removal efficiency and transportation efficiency of the entire cyclone separator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the novel three-dimensional structure of the present invention;

[0016] Figure 2 This is a new front view of the present invention;

[0017] Figure 3 This is a new left view of the present invention;

[0018] Figure 4 This is a schematic diagram of the entity filling of the inner cavity of the novel receiving chamber of the present invention;

[0019] Figure 5 The new cross-sectional three-dimensional structure of the present invention is schematically shown. Figure 1 ;

[0020] Figure 6 The new cross-sectional three-dimensional structure of the present invention is schematically shown. Figure 2 .

[0021] Explanation of the reference numerals: 1. air inlet; 2. convergent tube; 3. nozzle; 4. receiving chamber; 5. drop-out port; 6. mixing tube; 7. diffuser tube; 8. solid area; 9. discharge port. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] See also Figure 1-Figure 6 The present invention provides an embodiment: a new type of gas-solid ejector for preventing dust accumulation, comprising an air inlet 1, a convergent tube 2, a nozzle 3, a receiving chamber 4, a blanking port 5, a mixing tube 6, a diffuser tube 7, a solid area 8, and a discharge port 9. The right end of the air inlet 1 is provided with a receiving chamber 4, the lower end of the inner wall of the receiving chamber 4 is provided with a solid area 8, the upper end of the solid area 8 is connected with the convergent tube 2, the right end of the convergent tube 2 is provided with a nozzle 3, the upper end of the receiving chamber 4 is connected with the blanking port 5, the end of the receiving chamber 4 away from the air inlet 1 is connected with a mixing tube 6, the right end of the mixing tube 6 is connected with a diffuser tube 7, and the right end of the diffuser tube 7 is provided with a discharge port 9. By using high-pressure gas as a working fluid, the pressure is reduced and the speed is increased after passing through the nozzle 3, so that the gas entering the receiving chamber 4 is reduced. The working fluid reaches supersonic or subsonic speed, and a feeding port 5 is provided above the receiving chamber 4. After the ejected working fluid enters the receiving chamber 4 from the feeding port 5, it enters the mixing tube 6 under the pressure difference and the suction effect of the high-speed fluid to undergo intense mixing, exchange velocity and momentum, and the velocity field tends to be balanced, and the pressure gradually increases. At the outlet of the mixing tube 6, it enters the diffuser 7, and the velocity of the mixture decreases, and the pressure gradually increases. Under the final pressure difference, the mixture is ejected from the ejector at a certain speed. By designing the gas inlet pipe section connected to the nozzle 3 as a tapered pipe section, not only can the fluid be accelerated, but also due to the inclination angle of the tapered pipe section, dust particles can be effectively prevented from accumulating on the top of the pipe section, and the solid area 8 provided can prevent dust from accumulating in the cavity of the receiving chamber 4.

[0024] See also Figure 2-Figure 6In this embodiment, the area between the lower wall of the inner cavity of the receiving chamber 4 and the lower half outer wall of the nozzle 3 and the connected reducer 2 is a solid area 8, and the area between the lower edge of the nozzle 3 and the inlet of the mixing tube 6 and the area below it is also a solid area 8. The area connected by the lower wall of the inner cavity of the receiving chamber 4 and the reducer 2 and the lower edge of the nozzle 3 is designed as a solid structure. This design cleverly prevents dust particles from depositing in this area. The inner cavity of the receiving chamber 4 adopts a Venturi tube shape, that is, a cylindrical cavity is connected to a truncated cone cavity, and the end of the truncated cone cavity is The diameter is the same as that of the mixing tube 6, the length of the cylindrical cavity section is 0.1873m, the diameter is 0.102m, the length of the truncated cone cavity section is 0.0614m, its inlet diameter is the same as that of the cylindrical section, and the outlet diameter is the same as that of the mixing tube 6. The inlet pipe section connected to the nozzle 3 is a tapered pipe section, the inlet diameter of the tapered pipe section is 0.0615m, and the outlet diameter is 0.0441m. The height of the nozzle 3 is located on the central axis of the inner cavity of the receiving chamber 4, and the horizontal position is located at the beginning of the tapered section of the inner cavity of the receiving chamber 4. The tapered pipe section is the inlet of the working fluid, and the high-pressure gas is used to The body is used as the working fluid. After passing through the convergent tube 2 and the nozzle 3, the high-pressure gas speed reaches supersonic speed. At the same time, the pressure is reduced here to form a negative pressure area. The drop port 5 is located on the upper wall of the inner cavity of the receiving chamber 4. The inner diameter of the drop port 5 is the same as the outer diameter of the dust discharge port of the cyclone separator connected to it. The diameter of the drop port 5 is 0.105m. After the ejected working fluid enters from the upper drop port 5, it is sucked forward by the working fluid behind the nozzle 3. The diameter of the mixing tube 6 is the same as the maximum circular diameter formed by the jet ejected from the nozzle 3. The diameter of the mixing tube 6 is 0.06756m. The length of the diffuser 7 is about 8 times its diameter. Since a negative pressure area is formed near the outlet of the nozzle 3, the ejected working fluid enters the mixing tube 6 together with the high-speed gas under the action of the pressure difference, and then violent mixing occurs. The inlet diameter of the diffuser 7 is the same as the diameter of the mixing tube 6. The diameter of the diffuser 7 gradually increases from left to right. The outlet diameter of the diffuser 7 is 0.203m. The length of the diffuser 7 is 1 / 2 of the length of the mixing tube 6. Due to the increase in the tube diameter, the pressure increases, so that the mixed fluid is ejected from the ejector under the action of the residual pressure, thereby realizing transportation.

[0025] When working, high-pressure gas is used as the driving medium. First, the high-pressure gas is input from the air inlet 1, accelerated through the reducer 2 and ejected from the nozzle 3. In the process of passing through the reducer 2 and the nozzle 3, the speed of the high-pressure gas is accelerated to supersonic speed, and the pressure is reduced at the same time, forming a negative pressure area near the outlet of the nozzle 3. Then the ejected working fluid enters the receiving chamber 4 through the drop port 5, and is then dragged by the high-speed driving medium behind the nozzle 3. Due to the low-pressure area formed at the outlet of the nozzle 3, the ejected working fluid is sucked into the mixing tube 6 together with the high-speed gas under the action of the pressure difference, thereby achieving intense mixing. Secondly, the mixed fluid enters the diffuser 7. As the diameter of the pipeline gradually increases, its pressure also rises. Finally, under the action of the residual pressure, the mixed fluid is discharged from the outlet 9, thereby completing the entire collection process.

[0026] Through the above steps, the pipeline for the working gas to enter the receiving chamber 4 is designed as a tapered pipeline 2, which can not only increase the speed of the working fluid when leaving the nozzle 3 and increase the pressure difference in the receiving chamber 4, so that the ejected working fluid falling from the drop port 5 obtains a greater driving force, so that it can follow the working fluid into the mixing tube 6 as much as possible, and because the tapered pipe 2 has a certain inclination angle, the material falling on the tapered pipe 2 will flow to the mixing tube 6 under the action of gravity, avoiding the material from staying and accumulating here, so as to effectively solve the problem of dust particles accumulating here after falling, and greatly reduce the possibility of clogging of the gas-solid injector.

[0027] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A novel gas-solid ejector for preventing dust accumulation, comprising an air inlet (1); characterized in that: The invention also comprises a convergent tube (2), a nozzle (3), a receiving chamber (4), a blanking port (5), a mixing tube (6), a pressure diffuser (7), a solid region (8), and a discharge port (9). The receiving chamber (4) is arranged at the right end of the air inlet (1), the solid region (8) is arranged at the lower end of the inner wall of the receiving chamber (4), the upper end of the solid region (8) is connected to the convergent tube (2), the right end of the convergent tube (2) is arranged with a nozzle (3), the upper end of the receiving chamber (4) is connected to the blanking port (5), the end of the receiving chamber (4) away from the air inlet (1) is connected to the mixing tube (6), the right end of the mixing tube (6) is connected to the pressure diffuser (7), and the discharge port (9) is arranged at the right end of the pressure diffuser (7).

2. A new type of gas-solid ejector for preventing dust accumulation according to claim 1, characterized in that: The area between the lower wall surface of the inner cavity of the receiving chamber (4) and the lower half outer wall of the nozzle (3) and the connected tapered tube (2) is a solid area (8), and the area from the lower edge of the nozzle (3) to the inlet of the mixing tube (6) and the area below it is also a solid area (8).

3. A new type of gas-solid ejector for preventing dust accumulation according to claim 2, characterized in that: The inner cavity of the receiving chamber (4) adopts a venturi tube shape, that is, a cylindrical cavity is connected to a truncated cone cavity, the diameter of the end point of the tapered section of the truncated cone cavity is the same as the diameter of the mixing tube (6), the length of the cylindrical cavity section is 0.1873m, the diameter is 0.102m, the length of the truncated cone cavity section is 0.0614m, its inlet diameter is the same as that of the cylindrical section, and the outlet diameter is the same as that of the mixing tube (6).

4. A new type of gas-solid ejector for preventing dust accumulation according to claim 2, characterized in that: The nozzle (3) is connected to an air intake pipe section which is a gradually contracting pipe section. The inlet diameter of the gradually contracting pipe section is 0.0615 m, and the outlet diameter is 0.0441 m. The height of the nozzle (3) is located on the central axis of the inner cavity of the receiving chamber (4), and the horizontal position is located at the beginning of the gradually contracting section of the inner cavity of the receiving chamber (4).

5. A novel gas-solid ejector for preventing dust accumulation according to claim 1, characterized in that: The material drop opening (5) is located on the upper wall surface of the inner cavity of the receiving chamber (4), the inner diameter of the material drop opening (5) is the same as the outer diameter of the dust discharge port of the cyclone separator connected thereto, and the diameter of the material drop opening (5) is 0.105m.

6. A new type of gas-solid ejector for preventing dust accumulation according to claim 3, characterized in that: The diameter of the mixing tube (6) is the same as the maximum circular diameter formed by the jet ejected from the nozzle (3), the diameter of the mixing tube (6) is 0.06756 m, and the length of the mixing tube (6) is approximately 8 times its diameter.

7. A new type of gas-solid ejector for preventing dust accumulation according to claim 1, characterized in that: The inlet diameter of the diffuser tube (7) is the same as the diameter of the mixing tube (6), the diameter of the diffuser tube (7) gradually increases from left to right, the outlet diameter of the diffuser tube (7) is 0.203 m, and the length of the diffuser tube (7) is 1 / 2 of the length of the mixing tube (6).

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