High-pressure type two-fluid spray atomizer

Abstract

The utility model discloses a high-pressure type two-fluid spray atomizer which comprises a nozzle body, a compressed air distributor, a feed liquid distributor, a disc core, an embedded body and a nozzle assembly, the disc core is installed at the bottom end of a feed liquid hole of the feed liquid distributor in a close fit mode, and the bottom end of the embedded body is tightly matched with the disc core. A gap exists between the periphery of the embedded body and the inner wall of a feed liquid hole of the feed liquid distributor, the feed liquid distributor is installed in an inner cavity of the compressed air distributor in a pressing mode, a gap exists between the inner cavity of the compressed air distributor and the bottom end of the feed liquid hole of the feed liquid distributor, and the compressed air distributor and the nozzle body are installed in a pressing fit mode. A cavity is formed between the periphery of the compressed air distributor and the inner wall face of the nozzle body, and the top end of the nozzle body and the top end of the feed liquid distributor are connected with the nozzle assembly. The spray drying device not only can meet the spray drying requirement of superfine powder, but also can adjust the particle size of finished products and the yield of the finished products, and meets diversified spray drying requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of spray drying, and particularly relates to a high-pressure two-fluid spray atomizer. Background Art

[0002] Spray drying is a drying technology that disperses a liquid feedstock into droplets through an atomizer, which then comes into direct contact with hot air to produce a powdered or granular product. The atomizer is the core component of spray drying equipment, and the most common type is the atmospheric pressure two-fluid atomizer, also known as a two-fluid nozzle.

[0003] Atmospheric pressure two-fluid spray drying (such as Figure 1 The operating principle of a two-fluid spray atomizer (as shown) is to utilize high-speed airflow to separate liquid films. This high-speed airflow can originate from compressed air or steam. However, atmospheric-pressure two-fluid spray atomizers have a simple structure, lacking a core or inlay. The operating pressure of the feed pipe is relatively low, typically 0.4-1.0 MPa, meeting process requirements. Furthermore, the atomizer can only be fine-tuned through the feed pipe and compressed air (i.e., the gas-liquid ratio), resulting in a narrow adjustment range. This results in larger and coarser particles, significantly limiting the atomized particle size. These limitations make them unsuitable for spray drying of extremely fine powders (less than 10 microns) or for drying diverse fine powders with varying particle size requirements. Utility Model Content

[0004] In order to solve the above technical problems, the utility model discloses a high-pressure two-fluid spray atomizer, which can not only meet the spray drying needs of extremely fine powders, but also adjust the finished product particle size and finished product output to meet diversified spray drying needs.

[0005] The specific technical solutions of the utility model are as follows:

[0006] A high-pressure two-fluid spray atomizer comprises a nozzle body, a compressed air distributor, a liquid-feed distributor, a disc core, an inlay and a nozzle assembly, wherein the disc core is tightly mounted on the bottom end of the liquid-feed hole of the liquid-feed distributor, the bottom end of the inlay is tightly mounted on the disc core, and there is a gap between the outer periphery of the inlay and the inner wall of the liquid-feed hole of the liquid-feed distributor for passing the liquid, the liquid-feed distributor is tightly mounted in the inner cavity of the compressed air distributor, and there is a gap between the inner cavity of the compressed air distributor and the bottom end of the liquid-feed hole of the liquid-feed distributor for spraying compressed air, the compressed air distributor is tightly mounted on the nozzle body, and a cavity is formed between the outer periphery of the compressed air distributor and the inner wall surface of the nozzle body for passing compressed air, the top ends of the nozzle body and the liquid-feed distributor are respectively connected to the nozzle assembly, compressed air is passed into the cavity of the nozzle body by the nozzle assembly, and high-pressure liquid is passed into the liquid hole of the liquid-feed distributor.

[0007] Preferably, the nozzle assembly includes a nozzle joint, a nozzle outer tube and a nozzle inner tube, the nozzle outer tube is connected to the air inlet end of the nozzle joint, the nozzle inner tube is connected to the feed end of the nozzle joint, and the nozzle joint is threadedly connected to the top end of the nozzle body.

[0008] Preferably, a plurality of material grooves are circumferentially distributed on the outer peripheral surface of the bottom end of the inlay, a core hole is provided at the center of the core, and an arc groove is provided on the top surface of the core. The outer peripheral surface of the bottom end of the inlay is tightly fitted with the inner wall surface of the arc groove of the core, and the high-pressure liquid enters the core hole through the material groove.

[0009] Preferably, the trough is a chute.

[0010] Preferably, a plurality of air holes are provided on the nozzle joint along the circumference, and are connected to the outer tube of the nozzle for passing high-compressed air. A liquid through hole is provided at the center of the nozzle joint, and is connected to the inner tube of the nozzle for passing high-pressure liquid.

[0011] Preferably, a plurality of air channels are circumferentially distributed on the outer peripheral wall surface of the compressed air distributor, and the air channels are connected to the inner cavity of the compressed air distributor.

[0012] Preferably, the air passages are arranged to be inclined from the outer wall surface to the inner wall surface, and the inclination directions of all the air passages are consistent.

[0013] Beneficial effects: The utility model discloses a high-pressure two-fluid spray atomizer, which has the following advantages compared to a normal-pressure two-fluid spray atomizer:

[0014] (1) In the present invention, the compressed air is rotated by utilizing the tangential air channel, thereby obtaining radial velocity and centrifugal force capable of atomizing the liquid. This, combined with the high-pressure liquid, makes the liquid atomized finer, thereby obtaining a finer dried product, meeting the spray drying requirements of ultrafine powders (particle size less than 10 microns).

[0015] (2) In the present invention, different specifications of disk cores and different trough width inlays can be configured to work together according to the spray drying requirements to adjust the particle size and output of the finished product.

[0016] (3) In the present invention, the material liquid pressure adjustment range is large and can be adjusted within the range of 5-20MPa. The operation flexibility is large and the processing volume has a certain scalability. The droplet size can also be controlled by adjusting the gas-liquid ratio. Combined with the fine adjustment of the compressed air pressure, it is easier to control the product particle size and meet the drying requirements of products with different particle sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a simplified structural diagram of a conventional atmospheric pressure two-fluid atomizer;

[0018] Figure 2 1 is a cross-sectional view of the high-pressure two-fluid atomizer of Example 1;

[0019] Figure 3 is a top view of the nozzle joint of Example 1;

[0020] Figure 4 This is a schematic structural diagram of the compressed air distributor of Example 1;

[0021] Figure 5 is a radial cross-sectional view of the compressed air distributor of Example 1;

[0022] Figure 6 This is a schematic diagram of the disk core structure of Example 1;

[0023] Figure 7 This is a schematic diagram of the inlay structure of Example 1;

[0024] In the figure: nozzle body 1, cavity 1-1, compressed air distributor 2, inner cavity 2-1, air channel 2-2, liquid distributor 3, liquid hole 3-1, disk core 4, disk core hole 4-1, arc groove 4-2, inlay 5, material groove 5-1, nozzle assembly 6, nozzle joint 6-1, air hole 6-11, liquid through hole 6-12, nozzle outer tube 6-2, nozzle inner tube 6-3. DETAILED DESCRIPTION

[0025] The following are some improvements and modifications to the present invention in conjunction with the accompanying drawings, and these improvements and modifications should also be considered as within the scope of protection of the present invention. Example 1

[0026] like Figure 1-2 As shown, a high-pressure two-fluid spray atomizer includes a nozzle body 1, a compressed air distributor 2, a liquid distributor 3, a disc core 4, an inlay 5 and a nozzle assembly 6, wherein the disc core 4 is tightly mounted on the bottom end of the liquid hole 3-1 of the liquid distributor 3, the bottom end of the inlay 5 is tightly fitted with the disc core 4, and there is a gap between the outer periphery of the inlay 5 and the inner wall of the liquid hole of the liquid distributor 3 for passing the liquid, the liquid distributor 3 is tightly mounted in the inner cavity 2-1 of the compressed air distributor 2, and the compressed air distributor There is a gap between the inner cavity 2-1 of the device 2 and the bottom end of the liquid hole 3-1 of the liquid distributor 3, which is used to spray compressed air. The compressed air distributor 2 is installed with a press fit on the nozzle body 1, and a cavity 1-1 is formed between the outer periphery of the compressed air distributor 2 and the inner wall surface of the nozzle body, which is used to pass compressed air. The top ends of the nozzle body 1 and the liquid distributor 3 are respectively connected to the nozzle assembly 6, and compressed air is introduced into the cavity 1-1 of the nozzle body 1 by the nozzle assembly 6, and high-pressure liquid is introduced into the liquid hole 3-1 of the liquid distributor 3.

[0027] In this embodiment 1, the nozzle assembly 6 includes a nozzle joint 6-1, a nozzle outer tube 6-2, and a nozzle inner tube 6-3. The nozzle outer tube 6-1 is connected to the air inlet end of the nozzle joint 6-1, and the nozzle inner tube 6-3 is connected to the feed end of the nozzle joint 6-1. The nozzle joint 6-1 is threadedly connected to the top end of the nozzle body 1. In the present utility model, the nozzle outer tube 6-2 and the nozzle inner tube 6-3 are respectively connected to the nozzle joint 6-1 by welding.

[0028] In this embodiment 1, Figure 6-7 As shown, a plurality of material grooves 5-1 are circumferentially distributed on the outer peripheral surface of the bottom end of the inlay 5, a core hole 4-1 is provided at the center of the disc core 4, and an arc groove 4-2 is provided on the top surface of the disc core 4. The outer peripheral surface of the bottom end of the inlay 5 is tightly fitted with the inner wall surface of the arc groove 4-2 of the disc core 4, and the high-pressure liquid enters the disc core hole 4-1 through the material groove 5-1.

[0029] In this embodiment 1, the trough 5-1 is an inclined trough. The number of troughs is preferably 4, and all inclined troughs are inclined in the same direction. Figure 7 As shown, the trough 5-width (A*B) can be selectively designed according to actual needs.

[0030] In this embodiment 1, Figure 3 As shown, the nozzle joint 6-1 is provided with a plurality of air holes 6-11 along the circumference, and is connected to the nozzle outer tube 6-2 for passing high-pressure air. The center of the nozzle joint 6-1 is provided with a liquid through hole 6-12, and is connected to the nozzle inner tube 6-3 for passing high-pressure liquid.

[0031] In this embodiment 1, Figure 4-5 As shown, a plurality of air channels 2 - 2 are circumferentially distributed on the outer wall surface of the compressed air distributor 2 , and the air channels 2 - 2 are connected to the inner cavity 2 - 1 of the compressed air distributor 2 .

[0032] In this embodiment 1, the air passages 2-2 are arranged to be inclined from the outer wall to the inner wall, and all the air passages 2-2 have the same inclination direction. Figure 3 As shown, the inclination angle of the air channel 2-2 is 45°.

[0033] In the present utility model, in order to ensure the airtightness of the atomizer, sealing rings are provided in the installation gaps between the nozzle body 1 and the nozzle joint 6-1, between the nozzle joint 6-1 and the liquid distributor 3, between the compressed air distributor 2 and the liquid distributor 3, and between the compressed air distributor 2 and the nozzle body 1. This is a conventional technical means and is therefore not described in detail.

[0034] In the present invention, the fineness of the mist droplets can be adjusted by configuring the disc core 4 and the inlay 5 of different specifications, or by adjusting the pressure of the feed liquid. The specific principle is as follows:

[0035] The core 4 can be configured with a variety of different sizes of core holes 4-1, such as 1 mm, 2 mm, 3 mm, 4 mm, and 6 mm. The diameter of the core holes 4-1 can be adjusted to adjust the final particle size and the final product yield. A larger hole diameter results in larger particles, a greater spray volume, and a higher final product yield. Conversely, a smaller hole diameter results in smaller particles, a lower spray volume, and a lower final product yield.

[0036] Inlay 5 is equipped with a variety of different specifications of trough widths and trough angles. For example, the trough width can be 0.16" (0.41mm), 0.20" (0.51mm), 0.22" (0.56mm), 0.25" (0.64mm), 0.32" (0.81mm), 0.35" (0.89mm), etc. The trough spray angle is optional with various angles between 45° and 90°. The angle and spray distance of the liquid atomization are adjusted according to the spray angle of trough 5-1. The spray volume can be adjusted according to the different widths of the trough. The larger the trough size, the larger the particles, the larger the spray volume, and the higher the output of the finished product. Conversely, the smaller the trough size, the smaller the particles, the smaller the spray volume, and the lower the output of the finished product.

[0037] The utility model has a wide adjustment range for liquid pressure, adjustable within the range of 5-20MPa, providing great operational flexibility and a certain degree of scalability in processing capacity. Furthermore, by adjusting the gas-liquid ratio, the droplet size can be controlled, making it easier to control the product particle size. Combined with fine-tuning of the compressed air pressure, finer droplets can be atomized, resulting in a finer finished product. Atomization can be controlled and regulated by simply changing the air pressure, without changing the liquid flow rate.

[0038] The working principle of this utility model is as follows:

[0039] Compressed air enters the nozzle body 1's cavity 1-1 from the nozzle outer tube 6-2 through the air hole 6-11 in the nozzle connector 6-1. The compressed air then enters the inner cavity 2-1 through the tangential air passage 2-2 of the compressed air distributor 2, where it undergoes high-speed rotation. Regardless of the direction the compressed air enters the atomizer, it generates rotational motion through the compressed air distributor 2, thereby generating the radial velocity and centrifugal force necessary to atomize the liquid. The high-speed rotation of the compressed air is then ejected from the annular gap between the compressed air distributor 2 and the liquid distributor 3 at high velocities, typically 200-340 m / s, and can reach supersonic speeds. Simultaneously, high-pressure liquid (6-15 MPa) flows from the nozzle inner tube 6-3 through the liquid through-hole 6-12 in the nozzle connector 6-1 and into the liquid hole 3-1 of the liquid distributor 3. Under the influence of this high pressure, the liquid enters the core hole 4-1 of the disc 4 through the grooves 5-1 surrounding the inlay 5 and is ejected. When the gas-liquid two-phase flow contacts at the outlet end face of the atomizer, since the gas velocity ejected from the annular gap is very high (generally 200-340m / s) and the liquid outflow velocity is not high (generally no more than 2m / s), there is a large relative velocity between the two fluids, which generates a considerable friction force to atomize the liquid.

[0040] The above description is only an illustration of the present invention and is a preferred embodiment of the present invention. It should be noted that a person skilled in the art may make several improvements and modifications without departing from the present invention, and such improvements and modifications shall also be considered within the scope of protection of the present invention.

Claims

1. A high-pressure two-fluid spray atomizer, characterized in that: It includes a nozzle body, a compressed air distributor, a liquid distributor, a disc core, an inlay and a nozzle assembly, wherein the disc core is tightly mounted on the bottom end of the liquid hole of the liquid distributor, the bottom end of the inlay is tightly mounted on the disc core, and there is a gap between the outer periphery of the inlay and the inner wall of the liquid hole of the liquid distributor for passing the liquid, the liquid distributor is tightly mounted in the inner cavity of the compressed air distributor, and there is a gap between the inner cavity of the compressed air distributor and the bottom end of the liquid hole of the liquid distributor for spraying compressed air, the compressed air distributor is tightly mounted on the nozzle body, and a cavity is formed between the outer periphery of the compressed air distributor and the inner wall surface of the nozzle body for passing compressed air, the top ends of the nozzle body and the liquid distributor are respectively connected to the nozzle assembly, compressed air is passed into the cavity of the nozzle body by the nozzle assembly, and high-pressure liquid is passed into the liquid hole of the liquid distributor.

2. The high-pressure two-fluid spray atomizer according to claim 1, characterized in that: The nozzle assembly includes a nozzle joint, a nozzle outer tube and a nozzle inner tube, the nozzle outer tube is connected to the air inlet end of the nozzle joint, the nozzle inner tube is connected to the feed end of the nozzle joint, and the nozzle joint is threadedly connected to the top end of the nozzle body.

3. The high-pressure two-fluid spray atomizer according to claim 1, characterized in that: A plurality of material grooves are circumferentially distributed on the outer peripheral surface of the bottom end of the inlay, a core hole is provided at the center of the core, and an arc groove is provided on the top surface of the core. The outer peripheral surface of the bottom end of the inlay is tightly fitted with the inner wall surface of the arc groove of the core, and the high-pressure liquid enters the core hole through the material groove.

4. The high-pressure two-fluid spray atomizer according to claim 1, characterized in that: The material trough is a chute.

5. The high-pressure two-fluid spray atomizer according to claim 2, characterized in that: The nozzle joint is provided with a plurality of air holes along the circumference, and is connected to the outer tube of the nozzle for passing high-compressed air. The center of the nozzle joint is provided with a liquid through hole, and is connected to the inner tube of the nozzle for passing high-pressure liquid.

6. The high-pressure two-fluid spray atomizer according to claim 1, characterized in that: A plurality of air channels are circumferentially distributed on the outer peripheral wall surface of the compressed air distributor, and the air channels are communicated with the inner cavity of the compressed air distributor.

7. The high-pressure two-fluid spray atomizer according to claim 6, characterized in that: The air passages are arranged to be inclined from the outer wall surface to the inner wall surface, and all the air passages have the same inclination direction.

Images