Separator of coal mill

Abstract

The utility model relates to a coal mill separator which comprises an outer shell, an inner shell and a top plate, the inner shell is located in the outer shell, the top of the inner shell is conical, the top plate is detachably installed on the top of the outer shell, and a first fixing ring is fixedly installed on the lower surface of the top plate. A second fixing ring matched with the top of the inner shell is arranged below the first fixing ring, and an inclined annular filter screen is fixedly installed between the first fixing ring and the second fixing ring. A plurality of radial blades are fixedly installed between the first fixing ring and the second fixing ring and located in the filter screen, and the outer surface of the inner shell is sleeved with a sleeve. The utility model has the beneficial effects that the filter screen is arranged and can be used for filtering large coal particles in airflow, so that the damage to the radial blades caused by the coal particles when the large coal particles are separated by the radial blades is avoided, and the service life of the radial blades is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of separators, in particular to a coal mill separator. Background Technique

[0002] The separator is used to screen the pulverized coal ground by the coal mill. The pulverized coal meeting the combustion requirements is sent to the furnace through the powder pipe at the outlet of the separator, and the unqualified ones are reground.

[0003] The separator usually uses radial blades to separate the pulverized coal. The tangential velocity is generated through the guidance of the radial blades, so that the qualified particles are separated under the action of centrifugal force. However, the large coal particles mixed in the pulverized coal air flow, due to their large mass and inertia, often directly impact the surface of the blades when separated by the radial blades, resulting in increased wear of the blades, and further affecting the separation efficiency and the service life of the equipment. And the radial blades are usually located inside the separator. When the radial blades need to be replaced, the staff need to enter the coal mill to replace them, which is too troublesome. Content of the Utility Model

[0004] The purpose of the utility model is to provide a coal mill separator to solve the above problems existing in the prior art.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A coal mill separator includes a housing, an inner housing located inside the housing and having a conical top, and a top plate detachably installed on the top of the housing. A first fixing ring is fixedly installed on the lower surface of the top plate. A second fixing ring adapted to the top of the inner housing is arranged below the first fixing ring. An inclined and annular filter screen is fixedly installed between the first fixing ring and the second fixing ring. A plurality of radial blades are fixedly installed between the first fixing ring and the second fixing ring and inside the filter screen. A sleeve is sleeved on the outer surface of the inner housing.

[0007] The beneficial effects of the present utility model are as follows: When the pulverized coal air flow rises to the top of the inner shell, due to the conical shape of the top of the inner shell, the space at the top becomes larger. When the air flow flows, the channel changes from narrow to wide, resulting in a decrease in the air flow velocity. When the air flow velocity decreases, the followability of the particles in the air flow also deteriorates, causing the larger particles in the air flow to start to fall due to the action of gravity. At the same time, by setting a filter screen, the filter screen can filter large coal particles in the air flow, avoiding damage to the radial blades caused by coal particles when the radial blades are separated, thereby extending the service life of the radial blades. At the same time, the filter screen itself is inclined, causing the air flow to disperse or deflect when impacting the filter screen, easily reducing the number and energy of particles directly impacting the surface of the filter screen, and reducing the degree of damage to the filter screen; at the same time, by setting a sleeve, the falling coal particles can be separated from the rising air flow, reducing the situation where pulverized coal particles are unnecessarily re-entered into the air flow, thereby improving the separation efficiency of the pulverized coal; by designing the top plate and the outer shell to be detachable, when the staff replaces the radial blades or the filter screen, there is no need to disassemble the entire device, only the top plate needs to be disassembled, which greatly shortens the maintenance time. Due to the simplification of the maintenance process, the production interruption time caused by equipment shutdown for maintenance is reduced, and the utilization rate of the equipment is improved.

[0008] On the basis of the above technical solutions, the present utility model can be further improved as follows.

[0009] Further, a plurality of support rods are fixedly installed on the inner wall of the outer shell, and the other ends of the plurality of support rods all horizontally penetrate through the sleeve and are fixedly connected to the surface of the inner shell. Triangular plates are fixedly installed on both the upper surface and the lower surface of the support rods.

[0010] Further, an outer conical tube is detachably installed on the top of the top plate. The end of the outer conical tube is located below the second fixing ring. A coal inlet pipe is inserted into the top of the outer conical tube. The other end of the coal inlet pipe penetrates through the inner shell. A plurality of powder outlet pipes are connected to the top of the outer conical tube and on the outside of the coal inlet pipe.

[0011] Further, axial blades are fixedly installed on the inner wall of the outer conical tube.

[0012] Further, a conical plate is fixedly installed on the surface of the coal inlet pipe and inside the inner shell.

[0013] Further, both the radial blades and the axial blades are made of alloy steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the internal structure of the present utility model;

[0015] Figure 2Schematic diagram of the support rod and triangular plate structure of the present utility model;

[0016] Figure 3 Schematic diagram of the flow direction of pulverized coal air flow in the present utility model.

[0017] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0018] 1. Outer shell; 2. Inner shell; 3. Top plate; 4. First fixing ring; 5. Second fixing ring; 6. Filter screen; 7. Radial blade; 8. Sleeve; 9. Triangular plate; 10. Outer conical tube; 11. Coal inlet pipe; 12. Powder outlet pipe; 13. Axial blade; 14. Conical plate; 15. Support rod. Specific implementation mode

[0019] The principles and features of the present utility model will be described below in conjunction with the attached drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0020] As Figures 1 to 3 shown, Embodiment 1 of the present utility model is a coal mill separator, which includes an outer shell 1, an inner shell 2 located inside the outer shell 1 and having a conical top, and a top plate 3 detachably installed on the top of the outer shell 1. A first fixing ring 4 is fixedly installed on the lower surface of the top plate 3. A second fixing ring 5 adapted to the top of the inner shell 2 is arranged below the first fixing ring 4. An inclined and annular filter screen 6 is fixedly installed between the first fixing ring 4 and the second fixing ring 5. A plurality of radial blades 7 are fixedly installed between the first fixing ring 4 and the second fixing ring 5 and inside the filter screen 6. A sleeve 8 is sleeved on the outer surface of the inner shell 2.

[0021] When the pulverized coal air flow rises to the top of the inner shell 2, due to the conical shape of the top of the inner shell 2, the space at the top becomes larger. When the air flow moves, the channel changes from narrow to wide, resulting in a slowdown in the air flow velocity. When the air flow velocity slows down, the followability of the particles in the air flow also deteriorates, causing the larger particles in the air flow to start to fall due to the action of gravity. At the same time, by setting the filter screen 6, the filter screen 6 can filter the large coal particles in the air flow, avoiding damage to the radial blades 7 caused by the coal particles when the radial blades 7 separate, thereby extending the service life of the radial blades 7. At the same time, the filter screen 6 itself is inclined, causing the air flow to disperse or deflect when impacting the filter screen 6, easily reducing the number and energy of particles directly impacting the surface of the filter screen, and reducing the damage degree of the filter screen 6; at the same time, by setting the sleeve 8, the falling coal particles can be separated from the rising air flow, reducing the situation where the pulverized coal particles are unnecessarily re-entrained into the air flow, thereby improving the separation efficiency of the pulverized coal; by making the top plate 3 and the outer shell 1 detachable, when the staff replaces the radial blades 7 or the filter screen 6, there is no need to disassemble the entire device, only the top plate 3 needs to be disassembled, greatly shortening the maintenance time. Due to the simplification of the maintenance process, the production interruption time caused by equipment shutdown for maintenance is reduced, and the utilization rate of the equipment is improved.

[0022] In Embodiment 2 of the present utility model, a pulverizer separator, on the basis of Embodiment 1, a plurality of support rods 15 are fixedly installed on the inner wall of the outer shell 1. The other ends of the plurality of support rods 15 all horizontally penetrate through the sleeve 8 and are fixedly connected to the surface of the inner shell 2. Triangular plates 9 are fixedly installed on both the upper surface and the lower surface of the support rods 15.

[0023] The support rods 15 tightly connect the outer shell 1, the sleeve 8 and the inner shell 2 together to form a stable overall structure, effectively preventing the loosening or falling off of components caused by vibration or impact; at the same time, by setting the triangular plates 9, when the air flow moves upward, the triangular plates 9 can divide the air flow, thereby generating local turbulence, strengthening the mixing of pulverized coal in different regions, making the pulverized coal concentration entering the interior of the device tend to be uniform, and improving the separation efficiency.

[0024] In Embodiment 3 of the present utility model, a pulverizer separator, on the basis of Embodiment 1 or 2, an outer conical tube 10 is detachably installed on the top of the top plate 3. The end of the outer conical tube 10 is located below the second fixing ring 5. The top of the outer conical tube 10 is plugged with a coal inlet pipe 11. The other end of the coal inlet pipe 11 penetrates through the inner shell 2. A plurality of powder outlet pipes 12 are connected to the top of the outer conical tube 10 and located outside the coal inlet pipe 11.

[0025] By designing the outer conical tube 10 to be detachable, when the components inside the outer conical tube 10 need to be cleaned, repaired or replaced, the detachable design makes these operations simple and fast, enabling the staff to operate only on the outer conical tube 10 without having to disassemble the entire device on a large scale, thus greatly saving time and labor costs.

[0026] Embodiment 4 of the present utility model is a pulverizer separator. On the basis of Embodiment 3, axial blades 13 are fixedly installed on the inner wall of the outer conical tube 10.

[0027] By arranging the axial blades 13, the axial blades 13 can effectively adjust the uniformity and fineness of the pulverized coal, and at the same time improve the balance of each powder outlet pipe 12.

[0028] Embodiment 5 of the present utility model is a pulverizer separator. On the basis of Embodiment 3, a conical plate 14 is fixedly installed on the surface of the coal inlet pipe 11 and inside the inner shell 2.

[0029] During the separation process, the pulverized coal that has not been separated in time is likely to deposit at the bottom or edge of the separator due to the action of gravity. By arranging the conical plate 14, the design of the inclined surface of the conical plate 14 can guide this part of the pulverized coal to an area where it is easier to be removed or continue to participate in the separation, thus avoiding the long-term accumulation of pulverized coal and the possible blockage problem.

[0030] Embodiment 6 of the present utility model is a pulverizer separator. On the basis of Embodiment 4, both the radial blades 7 and the axial blades 13 are made of alloy steel.

[0031] The alloy steel can adopt 16Mn material, which enhances the structural strength of the radial blades 7 and the axial blades 13 and extends the service life of the radial blades 7 and the axial blades 13.

[0032] In the present utility model, coal blocks enter the inside of the pulverizer through the coal inlet pipe 11. After being ground by the pulverizer, the pulverized coal is driven by the air flow and enters this separator. After being filtered by the filter screen 6 in this device, large-volume coal particles in the pulverized coal air flow are filtered. When the pulverized coal air flow passes through the radial blades 7, a tangential velocity is generated under the guidance of the radial blades 7, so that medium-volume coal particles are separated under the action of centrifugal force. The qualified pulverized coal is discharged through the outer conical tube 10 and the powder outlet pipe 12 under the drive of the air flow, while the unqualified coal particles fall into the pulverizer for re-grinding.

[0033] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A coal mill separator, characterized in that: The invention comprises an outer shell (1), an inner shell (2) located inside the outer shell (1) and having a conical top, and a top plate (3) detachably mounted on the top of the outer shell (1); a first fixing ring (4) is fixedly mounted on the lower surface of the top plate (3); a second fixing ring (5) adapted to the top of the inner shell (2) is arranged below the first fixing ring (4); an inclined and annular filter screen (6) is fixedly mounted between the first fixing ring (4) and the second fixing ring (5); a plurality of radial blades (7) are fixedly mounted between the first fixing ring (4) and the second fixing ring (5) and inside the filter screen (6); and a sleeve (8) is sleeved on the outer surface of the inner shell (2).

2. A coal mill separator according to claim 1, characterized in that: A plurality of support rods (15) are fixedly mounted on the inner wall of the outer shell (1), the other ends of the plurality of support rods (15) all transversely penetrate the sleeve (8) and are fixedly connected to the surface of the inner shell (2), and triangular plates (9) are fixedly mounted on the upper and lower surfaces of the support rods (15).

3. A coal mill separator according to claim 1, characterized in that: An outer cone tube (10) is detachably mounted on the top of the top plate (3), the end of the outer cone tube (10) is located below the second fixing ring (5), a coal inlet pipe (11) is inserted into the top of the outer cone tube (10), the other end of the coal inlet pipe (11) passes through the inner shell (2), and a plurality of powder outlet pipes (12) are connected to the top of the outer cone tube (10) and located outside the coal inlet pipe (11).

4. A coal mill separator according to claim 3, characterized in that: Axial blades (13) are fixedly mounted on the inner wall of the outer cone tube (10).

5. A coal mill separator according to claim 3, characterized in that: A conical plate (14) is fixedly mounted on the surface of the coal inlet pipe (11) and inside the inner shell (2).

6. A coal mill separator according to claim 4, characterized in that: The radial blades (7) and the axial blades (13) are both made of alloy steel.

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