Three-product cyclone feeding device for coal dressing

Abstract

The utility model provides a feeding device of a three-product cyclone for coal dressing. The feeding device of the three-product cyclone for coal dressing comprises a material receiving section, a turning section and a spiral vertical section, wherein the spiral vertical section is positioned in the middle and is communicated with the material receiving section and the turning section; the material receiving section comprises an umbrella-shaped material uniformizing disc, a material receiving funnel and a screen; the spiral vertical section comprises a first inner pipeline, a first outer pipeline and a first spiral chute which is positioned between the first inner pipeline and the first outer pipeline and extends downwards; the turning section comprises a second inner pipeline and a second outer pipeline which are respectively communicated with the first inner pipeline and the first outer pipeline and are bent; the device has the advantages of being ingenious in design, free of a driving mechanism, convenient to maintain and reform, high in separation precision and efficiency, capable of effectively reducing the gangue content and the ash content of clean coal products and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a feeding device, especially to a three-product cyclone feeding device for coal separation. BACKGROUND

[0002] At present, three-product cyclones have been widely applied in coal separation, with the advantages of simple structure, no moving parts and low energy consumption, and are mainly divided into pressure three-product dense medium cyclones and pressureless three-product dense medium cyclones. The pressureless three-product dense medium cyclone (TPDMC) is a high-efficiency separation device, which is widely used in the separation of raw coal. Its core advantage lies in realizing the three-product separation of coarse clean coal, medium coal and gangue through a single device.

[0003] However, with more and more gangue and clay in raw coal, the mudification phenomenon is serious. Since the separation precision of the pressureless three-product dense medium cyclone for fine particle raw coal is poor, this is mainly because there is a tangential velocity difference between the material particles and the suspension during pressureless feeding, which leads to an increase in the actual separation density and a mismatch of heavy products, affecting the separation effect of fine particle materials, and further causing problems such as the inclusion of fine particle gangue in the clean coal product after separation or the existence of fine particle clean coal in the gangue product.

[0004] Therefore, in view of the low separation precision of the pressureless feeding dense medium cyclone for fine particle coal, it is necessary to preliminarily separate the fine particle materials in the raw coal, so as to reduce the influence of the fine particle materials on the separation effect of the three-product cyclone. SUMMARY

[0005] The utility model aims at providing a three-product cyclone feeding device for coal separation, which comprises a material receiving section at the upper part, a turning section at the lower part, and a spiral vertical section in the middle part and communicating with the material receiving section and the turning section. The material receiving section comprises an umbrella-shaped material distributing disc, a material receiving hopper below the umbrella-shaped material distributing disc, and a screen above the bottom of the material receiving hopper. The spiral vertical section comprises a vertical first inner pipe at the center, a vertical first outer pipe outside the first inner pipe, and a first spiral chute extending downward between the first inner pipe and the first outer pipe. The turning section comprises a second inner pipe and a second outer pipe in communication with the first inner pipe and the first outer pipe respectively and curved.

[0006] The material on the screen enters the first inner pipe, and the material under the screen enters the first spiral chute. The bottom of the turning section is in communication with the three-product cyclone.

[0007] Preferably, the three-product cyclone is a pressureless three-product dense medium cyclone.

[0008] Preferably, the mesh has a pore size of 0.25cm to 0.5cm.

[0009] Preferably, the height of the spiral vertical section is 30cm to 80cm.

[0010] Preferably, the turning section and the spiral vertical section are connected by a flange.

[0011] Preferably, a second spiral chute extending downward is further arranged between the second inner pipeline and the second outer pipeline.

[0012] Preferably, the first spiral chute and the second spiral chute are connected smoothly.

[0013] Preferably, the first inner pipeline is further provided with a distribution gate near the inner side of the tail of the first spiral chute.

[0014] Preferably, the maximum opening angle of the distribution gate is 45 degrees and occupies half of the cross-sectional width of the first spiral chute.

[0015] The coal preparation three-product cyclone feeding device has the advantages of ingenious design, simple structure, no moving parts and preliminary separation.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to be restrictive of the subject matter claimed. BRIEF DESCRIPTION OF DRAWINGS

[0017] The purposes, functions and advantages of the present application will be further clarified by the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0018] Figure 1 Fig. 1 schematically shows the overall structure of the coal preparation three-product cyclone feeding device of the present application;

[0019] Figure 2 Fig. 1(a) schematically shows the front view structure of the coal preparation three-product cyclone feeding device of the present application;

[0020] Figure 2 Fig. 1(b) schematically shows the top view structure of the coal preparation three-product cyclone feeding device of the present application;

[0021] Figure 3 Fig. 2 schematically shows the local structure of the spiral vertical section of the coal preparation three-product cyclone feeding device of the present application. DETAILED DESCRIPTION

[0022] The purposes and functions of the present application and the methods for achieving these purposes and functions will be clarified by referring to exemplary embodiments. However, the present application is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the specification is merely to help those skilled in the relevant art to comprehensively understand the specific details of the present application.

[0023] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0024] Figure 1 The present application is a three-product cyclone feeding device for coal separation 100, which comprises a material receiving section 1 at the upper part, a turning section 2 at the lower part, and a spiral vertical section 3 at the middle part and communicating with the material receiving section 1 and the turning section 2. The three-product cyclone is a pressureless three-product dense medium cyclone, and the feeding device 100 is mainly used for screening out fine particles and preliminary separation, thereby reducing the pollution of fine particle gangue to clean coal products and improving the separation accuracy of the pressureless three-product dense medium cyclone.

[0025] As shown in Figure 2 (a) and Figure 2 (b), the material receiving section 1 comprises an umbrella-shaped material uniformizing disc 11, a material receiving hopper 12 located directly below the umbrella-shaped material uniformizing disc 11, and a screen 13 located above the bottom of the material receiving hopper 12. The umbrella-shaped material uniformizing disc 11 can make the raw coal uniformly dispersed into the material receiving hopper 12, and the aperture of the screen 13 is preferably 0.25 cm to 0.5 cm, so as to screen out fine particles in the raw coal; preferably, the screen 13 is made of rubber material which can play a buffering role, preventing the raw coal from being broken and refined.

[0026] The spiral vertical section 3 comprises a first inner pipe 31 located at the center and vertically, a first outer pipe 32 located at the periphery of the first inner pipe 31 and vertically, and a first spiral chute 33 located between the first inner pipe 31 and the first outer pipe 32 and extending downward. The use of the spiral chute can effectively reduce the height of the entire spiral vertical section 3, and the height of the spiral vertical section 3 is preferably 30 cm to 80 cm.

[0027] The turning section 2 and the spiral vertical section 3 are connected by a flange 4, and the turning section 2 comprises a second inner pipe 21 and a second outer pipe 22 which are bent and communicate with the first inner pipe 31 and the first outer pipe 32, respectively. The bottom of the turning section 2 communicates with the three-product cyclone 9, so as to realize the separation of the oversize material from the center of the inlet of the three-product cyclone 9, and the separation of the undersize material from the periphery of the inlet of the three-product cyclone 9.

[0028] When raw coal arrives, it first falls onto the umbrella-shaped material distribution plate 11 and is evenly distributed onto the screen 13. The oversize material (mainly lump raw coal) after sorting enters the first inner pipe 31, and the undersize material (fine particles) enters the first spiral chute 33. Under the action of centrifugal force, the undersize material (fine particles) is further initially sorted. The fine particles with higher density are located on the outside of the first spiral chute 33, and the fine particles with lower density are located on the inside of the first spiral chute 33.

[0029] Furthermore, a downwardly extending second spiral groove 23 is provided between the second inner pipe 21 and the second outer pipe 22. The first spiral groove 33 and the second spiral groove 23 are smoothly connected, thereby achieving seamless smoothing of fine particles and allowing them to enter the three-product hydrocyclone 9 for sorting.

[0030] Furthermore, more preferably, such as Figure 3 As shown, the first inner pipe 31 is also equipped with a material distribution gate 5 near the inner side of the tail of the first spiral chute 33. The maximum opening degree θ of the material distribution gate 5 is 45 degrees and occupies half of the cross-sectional width s of the first spiral chute 33. At this time, there is no need to set up a second spiral chute 23. The fine particles (mainly high-density gangue particles) located outside the second spiral chute 23 directly enter the second outer pipe 22, while the fine particles (mainly low-density fine coal particles) located inside the second spiral chute 23 enter the second inner pipe 21 through the material distribution gate 5 and enter the three-product hydrocyclone 9 together with the above-mentioned screened material.

[0031] In summary, this utility model's three-product hydrocyclone feeding device 100 for coal preparation creatively employs a screen and spiral chute structure to perform preliminary sorting of fine particles in advance. This ensures that when raw coal enters the three-product hydrocyclone 9, the denser fine particles are closer to the outer swirling flow field of the hydrocyclone 9. The higher sorting density of the outer swirling flow field allows for earlier separation of fine gangue particles, which then enter the next stage of the hydrocyclone. This prevents fine gangue particles from mixing into the inner swirling flow field of the three-product hydrocyclone 9 and being discharged along with the clean coal, effectively reducing the amount of fine gangue particles in the clean coal product and consequently reducing its ash content. Finally, this utility model's three-product hydrocyclone feeding device 100 for coal preparation has many advantages, including ingenious design, no driving mechanism, convenient maintenance and modification, high sorting accuracy and efficiency, and the ability to effectively reduce the gangue and ash content of the clean coal product.

[0032] The accompanying drawings are schematic only and not to scale. Although the present invention has been described in conjunction with preferred embodiments, it should be understood that the scope of protection of the present invention is not limited to the embodiments described herein.

[0033] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed here. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the claims.

Claims

1. A three-product cyclone feeding device for coal preparation, comprising an upper material receiving section (1), a lower turning section (2), and a middle helical vertical section (3) connecting the material receiving section (1) and the turning section (2); wherein, the material receiving section (1) comprises an umbrella-shaped material distributing disc (11), a material receiving hopper (12) directly below the umbrella-shaped material distributing disc (11), and a screen (13) above the bottom of the material receiving hopper (12); the helical vertical section (3) comprises a first inner pipe (31) vertically located at the center, a first outer pipe (32) vertically located at the periphery of the first inner pipe (31), and a first helical chute (33) extending downward between the first inner pipe (31) and the first outer pipe (32); the turning section (2) comprises a second inner pipe (21) and a second outer pipe (22) respectively connected to the first inner pipe (31) and the first outer pipe (32) and curved; the material passing through the screen (13) enters the first inner pipe (31), and the material passing through the screen (13) enters the first helical chute (33); the bottom of the turning section (2) is connected to a three-product cyclone (9).

2. The tri-product cyclone feed arrangement for coal preparation according to claim 1, characterized in that: The three-product cyclone (9) is a pressureless three-product dense medium cyclone.

3. The tri-product cyclone feed arrangement for coal preparation according to claim 2, characterized in that: The screen (13) has a pore size of 0.25 cm to 0.5 cm.

4. The tri-product cyclone feed arrangement for coal preparation according to claim 3, characterized in that: The height of the helical vertical section (3) is 30 cm to 80 cm.

5. The tri-product cyclone feed arrangement for coal preparation according to claim 4, characterized in that: The turning section (2) and the helical vertical section (3) are connected by a flange (4).

6. The tri-product cyclone feed arrangement for coal preparation according to claim 5, characterized in that: A second helical chute (23) extending downward is further provided between the second inner pipe (21) and the second outer pipe (22).

7. The tri-product cyclone feed arrangement for coal preparation according to claim 6, characterized in that: The first helical chute (33) and the second helical chute (23) are smoothly connected.

8. The tri-product cyclone feed arrangement for coal preparation according to claim 5, characterized in that: The first inner pipe (31) is further provided with a material distributing gate (5) near the inner side of the tail of the first helical chute (33).

9. The tri- product cyclone feed arrangement for coal preparation according to claim 8, characterized in that: The maximum opening angle θ of the material distributing gate (5) is 45 degrees and occupies half of the cross-sectional width s of the first helical chute (33).

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