A fine powder particle drying device

Abstract

The present invention discloses a fine powder particle drying device, which includes a drying chamber and a separation chamber. The separation chamber is communicated with the drying chamber and is located above the drying chamber. The drying chamber is formed by a vertical cylindrical shell. The bottom of the shell is a ventilation area, above the ventilation area is a dispersion area, and above the dispersion area is a drying area. A disperser is provided in the dispersion area, and a hot air conveying pipeline is communicated with the ventilation area, and a material conveying pipeline is communicated with the dispersion area; Inside the shell of the drying area, there is also a cylindrical inner cylinder, and a sandwich is formed between the inner cylinder and the shell. There are spaces between the upper edge and the lower edge of the inner cylinder and the shell to allow the material to flow into the sandwich and flow out from the sandwich; A separator is provided inside the inner cylinder of the drying area. The separator includes separation blades and a separation main shaft. One end of the separation main shaft is connected to the separation blades and the other end passes through the separation chamber. A material outlet pipeline is communicated with the separation chamber. This device can continuously dry large particle materials with a size of 10 - 25 μm to achieve an average particle size of the outlet powder < 3 μm (90%).

Description

Technical Field

[0001] The present invention belongs to the technical field of drying equipment, and particularly relates to a drying equipment for fine powder particles. Background Art

[0002] FCC catalysts are mainly composed of molecular sieves as the main active ingredient, alumina, kaolin, etc. as carriers, and are processed through drying and roasting under the bonding action of pseudoboehmite and additives. Among them, drying is carried out by pneumatic drying. Intermediate products such as molecular sieves and pseudoboehmite are usually dried from slurries. The particle size D(v,0.9) of the original particles (or primary particles) in the slurry is generally not more than 1.5 μm. However, during the pneumatic drying process, certain agglomeration will occur, forming agglomerated large particles of 10 - 25 μm. It is very difficult to grind the agglomerated molecules finely after roasting, resulting in poor product strength. In addition, after pseudoboehmite agglomerates into larger particles, it is not conducive to acidification and affects the extrusion process. Therefore, solving the problem of powder agglomeration plays a crucial role in the application performance of molecular sieve powder and the comprehensive performance of catalyst products.

[0003] Usually, catalyst drying is carried out by pneumatic tube drying or rotary flash drying. Pneumatic tube drying has low investment and simple structure, but it is most likely to cause powder agglomeration and poor product performance. Flash drying is equipped with a forced-driven dispersing device, which can achieve the effect of dispersing large particle agglomerates. However, for ultra-fine powders, flash drying exposes the disadvantage of unsatisfactory dispersion effect. At present, there is still a blank for special equipment for the dispersion drying of catalyst molecular sieves. It is an inevitable trend to develop and design an integrated drying equipment that integrates instant dispersion, instant drying, and particle separation of materials. Summary of the Invention

[0004] The purpose of the present invention is to provide a drying equipment for fine powder particles to solve the problem of powder agglomeration.

[0005] To achieve the above object, the present invention provides a fine powder particle drying device, which includes a drying chamber and a separation chamber. The separation chamber is communicated with the drying chamber and is located above the drying chamber. The drying chamber is formed by a vertical cylindrical shell. The bottom of the shell is a ventilation area, above the ventilation area is a dispersion area, and above the dispersion area is a drying area. A disperser is provided in the dispersion area. The disperser includes dispersion blades and a disperser main shaft. The dispersion blades are located in the dispersion area. One end of the disperser main shaft is connected to the dispersion blades, and the other end passes through the ventilation area and is located outside the cylindrical shell. The ventilation area is communicated with a hot air conveying pipeline, and the dispersion area is communicated with a material conveying pipeline; inside the drying area shell, there is also a cylindrical inner cylinder, and a sandwich is formed between the inner cylinder and the shell. There is a space between the upper edge and the lower edge of the inner cylinder and the shell to allow the material to flow into the sandwich and flow out from the sandwich; a separator is provided inside the inner cylinder of the drying area. The separator includes separation blades and a separation main shaft. One end of the separation main shaft is connected to the separation blades, and the other end passes through the separation chamber. A material outlet pipeline is communicated with the upper part of the separation chamber.

[0006] In the fine powder particle drying device of the present invention, a diversion plate is provided in the ventilation area. The diversion plate is connected to the disperser main shaft through a positioning bearing and is sealed by back blowing and labyrinth seals.

[0007] In the fine powder particle drying device of the present invention, the hot air conveying pipeline is tangent to the outer shell of the ventilation area.

[0008] In the fine powder particle drying device of the present invention, the dispersion blades are fixed to the disperser main shaft in the form of key grooves; the separation blades are fixed to the separation main shaft in the form of key grooves.

[0009] In the fine powder particle drying device of the present invention, the number of the dispersion blades is odd.

[0010] In the fine powder particle drying device of the present invention, the disperser main shaft and the separation main shaft are respectively connected to a frequency conversion motor.

[0011] In the fine powder particle drying device of the present invention, the material outlet pipeline is tangent to the outer wall forming the separation chamber.

[0012] In the fine powder particle drying device of the present invention, the material conveying pipeline is a single spiral conveying pipeline or a double spiral conveying pipeline.

[0013] Advantages of the present invention:

[0014] This device can continuously dry agglomerated large particle materials with a size of 10 - 25 μm. When the device is operating, it integrates instant dispersion, instant drying, and particle separation of the materials. At the same time, the coarse particles separated by the separator are subjected to multiple cycles of crushing - separation during the process of being carried by the air flow, and finally the average particle size of the powder at the outlet is < 3 μm (90%). Brief Description of the Drawings

[0015] Figure 1 It is the front view of the fine powder particle drying device of the present invention;

[0016] Figure 2 is Figure 1 the sectional view taken along line B - B in

[0017] Figure 3 is Figure 1 the sectional view taken along line A - A in

[0018] Figure 4 is Figure 1 the sectional view taken along line C - C in

[0019] Among them, the reference numerals:

[0020] 1 - main shaft of the disperser, 2 - diversion plate, 3 - ventilation area, 4 - hot air conveying pipeline, 5 - disperser, 6 - material conveying pipeline, 7 - dispersion area, 8 - housing, 9 - material flow channel, 10 - separator, 11 - main shaft of the separator, 12 - separation chamber, 13 - material outlet pipeline. Detailed Description of the Preferred Embodiments

[0021] The present invention will be specifically described below through embodiments. It is necessary to point out here that the following embodiments are only used to further illustrate the present invention and cannot be construed as limiting the protection scope of the present invention. Those skilled in the art can make some non - essential improvements and adjustments to the present invention according to the above content of the present invention.

[0022] Such as Figures 1 to 4As shown in the figure, the present invention discloses a fine powder particle drying device, which includes a drying chamber and a separation chamber 12. The separation chamber 12 is communicated with the drying chamber and is located above the drying chamber. The drying chamber is formed by a vertical cylindrical shell. The bottom of the shell is a ventilation area 3. Above the ventilation area 3 is a dispersion area 7. Above the dispersion area 7 is a drying area. A disperser 5 is provided in the dispersion area 7. The disperser 5 includes dispersion blades and a disperser main shaft 1. The dispersion blades are located in the dispersion area 7. One end of the disperser main shaft 1 is connected to the dispersion blades, and the other end passes through the ventilation area 3 and is located outside the cylindrical shell 8. The ventilation area 3 is communicated with a hot air conveying pipeline 4, and the dispersion area 7 is communicated with a material conveying pipeline 6. Inside the drying area shell, there is also a cylindrical inner cylinder, and a sandwich is formed between the inner cylinder and the shell 8. There are spaces between the upper and lower edges of the inner cylinder and the shell 8 to allow the material to flow into the sandwich and flow out of the sandwich. A separator 10 is provided inside the inner cylinder in the drying area. The separator 10 includes separation blades and a separation main shaft 11. One end of the separation main shaft 11 is connected to the separation blades, and the other end passes through the separation chamber 12. A material outlet pipeline 13 is communicated with the separation chamber 12.

[0023] In this device, the drying area is in the form of a sandwich. The inner layer is a material flow channel 9, and the sandwich is a descending channel for the large particle materials separated by the separator. During the upward movement of the material, the coarse particles with unqualified particle sizes are thrown towards the periphery of the cylinder by the separation blades due to the action of a large centrifugal force and sink along the sandwich of the equipment shell 8, and then fall again to the material dispersion area 7 to be impacted by the secondary air flow and dispersed, so that the fine powder agglomerated in the coarse particles is dispersed and blown towards the separator 10 again for material particle separation.

[0024] In a specific embodiment, a diversion plate is provided in the ventilation area. The diversion plate is connected to the disperser main shaft through a positioning bearing and is sealed by back blowing air and a labyrinth seal. The inner flow channel of the diversion plate is rectangular, which can increase the initial kinetic energy of the air flow spirally flowing in the drying area and the dispersion area, and better carry away the fine powder particles.

[0025] In a specific embodiment, the hot air conveying pipeline is tangent to the outer shell of the ventilation area, and the hot air conveying pipeline is connected to the outer shell of the ventilation area by welding to ensure that the flow channel of the hot air is in the form of a volute, increasing the fluidity of the material.

[0026] In a specific embodiment, the dispersion blades are fixed to the disperser main shaft in the form of key grooves; the separation blades are fixed to the separation main shaft in the form of key grooves.

[0027] In a specific embodiment, the number of the dispersing vanes is odd. The dispersing vanes can increase the number of layers according to the characteristics of the material. For example, if particles fall onto the diversion plate 2, a set of dispersing vanes can be arranged above the diversion plate 2 to disperse the particles falling into the ventilation area 3. The structure and form of the disperser 5 and the rotation speed of the main shaft 1 of the disperser have a great influence on the drying of the particle size of the material. It is necessary to determine the optimal structure and rotation speed of the disperser according to comprehensive factors such as the diameter and physical properties of the material flow channel 9. Preferably, the rotation speed of the main shaft of the disperser is 1000 - 4500 rpm.

[0028] In a specific embodiment, the main shaft of the disperser and the main shaft of the separator are respectively connected to a frequency conversion motor, which is used to drive the rapid rotation of the disperser and the separator, and the rotation speed is adjustable through the frequency conversion motor.

[0029] In a specific embodiment, the material outlet pipe is tangent to the outer wall forming the separation chamber and is connected by welding. The particles meeting the particle size requirements after being separated by the separator 10 are carried out by the drying air flow through the gaps between the forced separation vanes.

[0030] In a specific embodiment, the material conveying pipe is a single - spiral conveying pipe or a double - spiral conveying pipe. The single - spiral conveying pipe or the double - spiral conveying pipe spirally pushes the material, and can be selected as the "O" shape of the single - spiral or the "W" shape of the double - spiral according to the output of the product.

[0031] When the equipment is performing drying treatment, hot air is introduced into the ventilation area 3 through the hot - air conveying pipe 4. Since the hot - air conveying pipe 4 is tangent to the outer shell of the ventilation area 3, it can ensure that the flow path of the hot air is volute - type. The hot air moves upward to reach the dispersing area 7, and the material to be dried is introduced into the dispersing area 7 through the material conveying pipe 6. Under the rapid rotation of the disperser 5, the large - particle material is broken into smaller - particle size particles, and continuously moves upward under the drive of the hot air and enters the material flow channel 9 in the drying area for drying. There is a separator 10 above the drying area. The separator 10 rotates rapidly. The coarser particles with larger particle size are subjected to a greater centrifugal force around the separator 10, are thrown to a position closer to the shell 8, and sink along the interlayer, and then fall again to the material dispersing area 7 to be impacted and dispersed by the secondary air flow, so that the fine powder agglomerated in the coarse particles is dispersed and blown towards the separator 10 again for material particle separation. The particles meeting the particle size requirements after being separated by the separator 10 are carried out by the drying air flow through the gaps between the forced separation vanes and enter the separation chamber 12, and are discharged through the material outlet pipe 13.

[0032] Certainly, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the claims of the present invention.

Claims

1. A fine powder particle drying device, comprising a drying chamber and a separation chamber, characterized in that The separation chamber communicates with the drying chamber and is located above the drying chamber. The drying chamber is formed by a vertical cylindrical shell. The bottom of the shell is a ventilation area, above which is a dispersion area, and above the dispersion area is a drying area. A disperser is provided in the dispersion area. The disperser includes dispersion blades and a disperser main shaft. The dispersion blades are located in the dispersion area. One end of the disperser main shaft is connected to the dispersion blades, and the other end passes through the ventilation area and is located outside the cylindrical shell. The ventilation area is connected to a hot air conveying pipeline, and the dispersion area is connected to a material conveying pipeline; inside the drying area shell, there is also a cylindrical inner cylinder, and a sandwich is formed between the inner cylinder and the shell. There are spaces between the upper and lower edges of the inner cylinder and the shell to allow the material to flow into and out of the sandwich; a separator is provided inside the inner cylinder in the drying area. The separator includes separation blades and a separation main shaft. One end of the separation main shaft is connected to the separation blades, and the other end passes through the separation chamber. A material outlet pipeline is connected to the upper part of the separation chamber.

2. The fine powder particle drying equipment according to claim 1, characterized in that, A diversion plate is provided in the ventilation area. The diversion plate is connected to the disperser main shaft through a positioning bearing and is sealed by back blowing air and labyrinth seals.

3. The fine powder particle drying equipment according to claim 1, wherein The hot air conveying pipeline is tangent to the outer shell of the ventilation area.

4. The fine powder particle drying equipment according to claim 1, characterized in that, The dispersion blades are fixed to the disperser main shaft in the form of key grooves; the separation blades are fixed to the separation main shaft in the form of key grooves.

5. The fine powder particle drying equipment according to claim 1, characterized in that The number of the dispersion blades is odd.

6. The fine powder particle drying equipment according to claim 1, characterized in that, The disperser main shaft and the separation main shaft are respectively connected to a variable frequency motor.

7. The fine powder particle drying equipment according to claim 1, characterized in that, The material outlet pipeline is tangent to the outer wall forming the separation chamber.

8. The fine powder particle drying equipment according to claim 1, characterized in that, The material conveying pipeline is a single spiral conveying pipeline or a double spiral conveying pipeline.

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