Raw coal premixing cyclone device of non-pressure three-product dense medium cyclone

Abstract

A raw coal premixing cyclone device of a non-pressure three-product heavy-medium cyclone comprises a barrel and a conical feeding port integrally formed in the barrel, the inner diameter of the upper end of the conical feeding port is the same as that of the barrel, the inner diameter of the lower end of the conical feeding port is the same as that of a first-section cyclone feeding elbow of the three-product heavy-medium cyclone, and the inner diameter of the lower end of the conical feeding port is the same as that of a second-section cyclone feeding elbow of the three-product heavy-medium cyclone. A spiral surface arranged along the inner wall of the cylinder body is arranged in the cylinder body, the spiral surface is of a symmetrical double-spiral structure, and the spiral direction of the spiral surface is the same as the rotation direction of fluid in the three-product dense medium cyclone; and the lower end of the conical feeding hole is provided with a flange plate for fixing the conical feeding hole on the feeding elbow of the first-section cyclone. Raw coal can be in a rotational flow state before entering the swirler, coal particles are prevented from directly falling into a separation flow field of the swirler and damaging the stability of the separation flow field, the probability that clean coal carries gangue or gangue carries coal can be reduced, the separation precision of the swirler is improved, and the separation efficiency of the swirler is improved. And the service life of the feeding barrel of the cyclone can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of cyclone separation, and in particular to a pressureless three-product heavy medium cyclone premixing cyclone device for raw coal. Background Technology

[0002] The pressureless three-product heavy medium hydrocyclone is a simple separation device with no moving parts. It features high separation efficiency and precision, and is widely used in coal washing. Traditional pressureless three-product heavy medium hydrocyclones use the weight of the coal itself to enter the hydrocyclone through a raw coal feed hopper. However, due to the feeding characteristics, coal particles fall directly into the rotating flow field, which easily disrupts the stability of the internal flow field of the hydrocyclone, leading to a decrease in separation efficiency and the presence of gangue in the clean coal or coal carried by gangue. Furthermore, the feeding method of the pressureless three-product heavy medium hydrocyclone exacerbates the wear of the feed hopper, increasing the production cost of the coal washing plant. Therefore, to improve the separation accuracy of the hydrocyclone and extend the service life of the feed hopper, a pressureless three-product heavy medium hydrocyclone raw coal premixing hydrocyclone device needs to be designed to solve the above problems. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a pressureless three-product heavy medium cyclone premixing cyclone device for raw coal, so as to solve the technical problems mentioned in the background art.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A pressureless three-product heavy medium cyclone premixing cyclone device for raw coal includes a cyclone device body, which includes a cylinder and a conical inlet integrally formed on the cylinder. The inner diameter of the upper end of the conical inlet is the same as the inner diameter of the cylinder, and the inner diameter of the lower end of the conical inlet is the same as the inner diameter of the inlet bend of the first stage of the three-product heavy medium cyclone. A helical surface is provided inside the cylinder along the inner wall of the cylinder. The helical surface has a symmetrical double helix structure, and the helical direction of the helical surface is the same as the rotation direction of the fluid inside the three-product heavy medium cyclone. A flange is provided at the lower end of the conical inlet for fixing the conical inlet to the inlet bend of the first stage of the cyclone.

[0006] Furthermore, in the above-mentioned utility model, the included angle between the generatrix of the conical feed inlet and the axis is 30°-40°.

[0007] Furthermore, in the above-mentioned utility model content, the height of the cylinder is 2000-4000mm.

[0008] Furthermore, in the above-mentioned utility model, the height of the cylinder is 1.5-2 times the pitch of the helical surface.

[0009] Furthermore, in the above-mentioned utility model, the inner diameter of the cylinder is 0.7-1.25 times the inner diameter of the first section of the three-product heavy medium cyclone.

[0010] Furthermore, in the above-mentioned utility model, the width of the spiral surface is 0.25-0.4 times the inner diameter of the cylinder.

[0011] The beneficial effects of this utility model are:

[0012] This invention allows raw coal to be in a swirling state before entering the hydrocyclone, preventing coal particles from falling directly into the hydrocyclone's separation flow field and disrupting its stability. This not only reduces the probability of gangue being carried in clean coal or gangue carrying coal, thus improving the hydrocyclone's separation accuracy, but also extends the service life of the hydrocyclone's feed cylinder. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 This is a schematic diagram showing the connection between this utility model and a pressureless three-product heavy medium cyclone.

[0016] In the diagram, 1-three-product heavy medium cyclone, 2-cyclone device body, 3-first-stage cyclone inlet elbow, 201-cylinder, 202-conical inlet, 203-spiral surface, 204-flange. Detailed Implementation

[0017] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Example:

[0020] A pressureless three-product heavy medium cyclone premixing cyclone device for raw coal, see attached document. Figure 1 -Appendix Figure 3 As shown, the device includes a cyclone device body 2, which includes a cylindrical body 201 and a conical inlet 202 integrally formed on the cylindrical body 201. The angle between the generatrix of the conical inlet 202 and the axis is set to 30°-40°. The inner diameter of the upper end of the conical inlet 202 is the same as the inner diameter of the cylindrical body 201, and the inner diameter of the lower end of the conical inlet 202 is the same as the inner diameter of the inlet bend 3 of the first section of the three-product heavy medium cyclone 1. A spiral surface 203 is provided inside the cylindrical body 201 along the inner wall of the cylindrical body 201. The spiral surface 203 is a symmetrical double spiral structure, and the spiral direction of the spiral surface 203 is the same as the rotation direction of the fluid inside the three-product heavy medium cyclone 1. A flange 204 is provided at the lower end of the conical inlet 202 for fixing the conical inlet 202 to the inlet bend 3 of the first section of the cyclone 1.

[0021] In practical application, this invention uses a flange 204 to fix the cyclone device body 2 onto the feed elbow 3 of the first stage of the three-product heavy medium cyclone 1. During feeding, raw coal falls onto the spiral surface 203 inside the cylinder 201 and descends spirally along the double-spiral structure of the spiral surface 203, entering a cyclone state. Finally, it enters the first stage of the three-product heavy medium cyclone 1 through the conical feed inlet 202 for cyclone separation. Because the spiral direction of the spiral surface 203 is the same as the rotation direction of the fluid inside the three-product heavy medium cyclone 1, the raw coal particles are already in the same cyclone state as inside the first stage cyclone before entering it. This avoids the raw coal particles falling directly into the cyclone's separation flow field, thus ensuring the stability of the separation flow field inside the first stage cyclone. Compared to the traditional direct-fall feeding method using a feed funnel, this significantly reduces the probability of gangue entrained in the clean coal and improves the cyclone's separation accuracy. Secondly, this new method of raw coal feeding can effectively reduce the contact between raw coal and the cylinder, which can effectively reduce the wear of the cylinder, increase the service life of the hydrocyclone feed cylinder, and reduce production costs.

[0022] In the above embodiments, the height of the cylinder 201 is further set to 2000-4000mm, and the height of the cylinder 201 is 1.5-2 times the pitch of the spiral surface, so that the raw coal matches the swirling flow in the first-stage hydrocyclone as much as possible when it reaches the bottom of the cylinder 201. Furthermore, the inner diameter of the cylinder 201 is 0.7-1.25 times the inner diameter of the first-stage hydrocyclone of the three-product heavy medium hydrocyclone 1, so that the feed rate of the cylinder 201 is close to the separation rate of the first-stage hydrocyclone. The width of the spiral surface is 0.25-0.4 times the inner diameter of the cylinder, reducing the probability that the raw coal falls directly into the feed bend 3 of the first-stage hydrocyclone from the center of the double-spiral structure spiral surface.

[0023] In summary, this invention allows raw coal to be in a swirling state before entering the hydrocyclone, preventing coal particles from falling directly into the hydrocyclone's separation flow field and disrupting its stability. This not only reduces the probability of gangue being mixed with clean coal or coal being carried by gangue, thus improving the hydrocyclone's separation accuracy, but also extends the service life of the hydrocyclone's feed cylinder. It is suitable for widespread use.

[0024] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A pressureless three-product heavy medium cyclone raw coal premixing cyclone device, characterized in that, The cyclone device body comprises a cylinder and a conical inlet integrally formed on the cylinder, the inner diameter of the upper end of the conical inlet is the same as the inner diameter of the cylinder, the inner diameter of the lower end of the conical inlet is the same as the inner diameter of a one-stage cyclone inlet elbow of a three-product dense medium cyclone, a helical surface is arranged along the inner wall of the cylinder, the helical surface is a symmetrical double helix structure, and the helical direction of the helical surface is the same as the fluid rotation direction inside the three-product dense medium cyclone; a flange is arranged at the lower end of the conical inlet for fixing the conical inlet on the one-stage cyclone inlet elbow.

2. The pressureless three-product heavy medium cyclone raw coal pre-mixing cyclone device according to claim 1, characterized in that, The included angle between the generatrix of the conical inlet and the axis is 30-40°.

3. The pressureless three-product heavy medium cyclone raw coal pre-mixing cyclone device according to claim 1, characterized in that, The height of the cylinder is 2000-4000 mm.

4. The no-pressure three-product heavy medium cyclone raw coal pre-mixing cyclone device according to claim 3, characterized in that, The height of the cylinder is 1.5-2 times the pitch of the helical surface.

5. The no-pressure three-product heavy medium cyclone raw coal pre-mixing cyclone device according to claim 1, characterized in that, The inner diameter of the cylinder is 0.7-1.25 times the inner diameter of the one-stage cyclone of the three-product dense medium cyclone.

6. The no-pressure three-product heavy medium cyclone raw coal pre-mixing cyclone device according to claim 5, characterized in that, The width of the helical surface is 0.25-0.4 times the inner diameter of the cylinder.

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