Backflow isolation type coarse powder separator

Abstract

The invention belongs to the technical field of separation equipment, and particularly relates to a backflow isolation type coarse powder separator which comprises a conical barrel, the upper end of the conical barrel is communicated with a barrel cover, the center of the lower end of the conical barrel is communicated with an air inlet pipe, the lower end of the conical barrel and one side of the air inlet pipe are communicated with a backflow pipe, and one side of the barrel cover is communicated with an air outlet pipe. A transmission box is fixedly connected to the inner top wall of the barrel cover, a rotating pipe is rotatably connected to the center position of the barrel cover, the rotating pipe vertically penetrates through the transmission box and is rotatably connected with the transmission box, and the part, located below the transmission box, of the rotating pipe is fixedly sleeved with a flat steel rotor. The coal pulverizing system has the advantages that by arranging the backflow cover, two-phase flow just entering the conical barrel can be prevented from intersecting with falling backflow coarse powder during coarse powder separation work, so that the air outlet efficiency of the coal pulverizing system is improved, the coal pulverizing energy consumption is reduced, and maintenance is simpler and more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of separation equipment, and in particular to a reflux isolation type coarse powder separator. Background Art

[0002] The coarse powder separator is an important equipment in the intermediate storage type powder making system of thermal power plants. Its basic principle is to rotate and separate the mixed two-phase flow of air and powder. The qualified powder and air enter the fine powder separator for air and powder separation, and the unqualified coarse powder is separated and returned to the coal mill for further grinding.

[0003] However, in actual operation, the air-powder two-phase flow entering the coarse powder separator intersects with the coarse powder that flows back after separation, causing some qualified powder to return to the coal mill along with the coarse powder, resulting in reduced powder output efficiency and increased energy consumption of the pulverizing system.

[0004] In order to solve the above problems, we proposed a reflux isolation type coarse powder separator. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a reflux isolation type coarse powder separator.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a reflux isolation type coarse powder separator, comprising a conical cylinder, the upper end of the conical cylinder is connected with a cylinder cover, the center position of the lower end of the conical cylinder is connected with an air inlet pipe, the lower end of the conical cylinder and the position on one side of the air inlet pipe are connected with a return pipe, one side of the cylinder cover is connected with an air outlet pipe, a transmission box is fixedly connected to the top wall of the cylinder cover, a rotating tube is rotatably connected to the center position of the cylinder cover, the rotating tube vertically penetrates the transmission box and is rotatably connected thereto, and the portion of the rotating tube located below the transmission box is fixedly sleeved with a flat steel rotor;

[0007] A lifting rod penetrating the rotating tube is vertically slidably connected in the rotating tube, and an annular mounting frame is provided at the lower end of the lifting rod, and the annular mounting frame includes four fixing rods fixedly connected to the lower end of the lifting rod and distributed in a cross shape, and one end of the four fixing rods away from the lifting rod is commonly fixedly connected to a fixing ring plate, and a rotating ring plate concentrically arranged therewith is rotatably connected to the outer circumference of the fixing ring plate, and a return hood is installed on the outer circumference of the rotating ring plate, and the return hood is bucket-shaped with a wide top and a narrow bottom, and the return hood is spaced apart from the inner wall of the conical tube;

[0008] The upper end of the lifting rod is fixedly connected to an end plate, a threaded rod vertically penetrates and is threadedly connected to the end plate, the lower end of the threaded rod is rotatably connected to the cylinder cover, the upper end of the cylinder cover is fixedly connected to a fixing frame, the upper end of the threaded rod is rotatably connected to the fixing frame, and a second motor that drives the threaded rod to rotate is fixedly installed on the fixing frame.

[0009] In the above-mentioned reflux isolation type coarse powder separator, a first gear is fixedly sleeved on the rotating tube and in the transmission box, a second gear is meshed with one side of the first gear, a transmission rod is coaxially fixed and penetrated through the second gear, the lower end of the transmission rod is rotatably connected to the bottom wall of the transmission box, the upper end of the transmission rod penetrates the cylinder cover and is rotatably connected thereto, a first bevel gear is fixedly sleeved on the upper end of the transmission rod, a first motor is fixedly installed on the upper end of the cylinder cover, a second bevel gear is fixedly sleeved on the output end of the first motor, and the second bevel gear is vertically meshed with the first bevel gear.

[0010] In the above-mentioned reflux isolation type coarse powder separator, the reflux cover is composed of eight reflux cover single pieces of the same size, and the reflux cover single piece is composed of an upper arc plate, an arc plate and a lower arc plate welded to each other from top to bottom. The arc plate is parallel to and fits with the rotating ring plate, and the upper arc plate and the lower arc plate are both inclined toward the inner side of the conical cylinder.

[0011] In the above-mentioned reflux isolation type coarse powder separator, eight evenly distributed limit blocks are fixedly connected to the outer circumferential surface of the rotating ring plate, bolt holes are provided on the outer circumferential surface of the rotating ring plate and at the upper and lower positions of each limit block, and the arc plate is provided with an installation opening matching the limit block, and each of the limit blocks passes through the corresponding installation opening respectively, and each of the arc plates is provided with an anti-detachment bolt at the upper and lower positions of the installation opening, and each of the anti-detachment bolts is threadedly connected to the corresponding bolt hole.

[0012] In the above-mentioned reflux isolation type coarse powder separator, grippers are fixedly connected on each of the arc-shaped plates and at positions on both sides of the installation opening.

[0013] In the above-mentioned reflux isolation type coarse powder separator, an inspection port is provided on the outer peripheral surface of the conical cylinder, and a sealing door plate is provided in the inspection port.

[0014] In the above-mentioned reflux isolation type coarse powder separator, a rectangular support platform is provided on the outer side of the conical cylinder, and the inner side of the support platform is fixedly connected to the outer wall of the conical cylinder.

[0015] Compared with the existing technology, the advantages of this reflux isolation type coarse powder separator are:

[0016] By setting a reflux hood, the reflux hood is in the shape of a bucket which is wide at the top and narrow at the bottom. The reflux hood is spaced apart from the inner wall of the conical cylinder. The gap between the reflux hood and the conical cylinder constitutes a flow channel for the separated coarse powder. When the flat steel rotor rotates to separate the coarse powder, the coal powder with larger mass in the air-powder two-phase flow which has just entered the conical cylinder through the air inlet pipe can directly fall to the bottom of the conical cylinder under the action of gravity for reflux, and the remaining coal powder can move up under the action of wind and pass through the reflux hood to enter the flat steel rotor part. Under the centrifugal action of the flat steel rotor, the remaining coarse coal powder is thrown outward under the action of centrifugal force and gradually falls under the action of weight. During the falling process, it can gradually contact the inner wall of the conical cylinder and the outer wall of the reflux hood, and then gradually move down to the bottom of the conical cylinder in the gap formed by the two, completing the reflux of the coarse powder. The coarse powder separation work under this mode can avoid the intersection of the two-phase flow which has just entered the conical cylinder and the coarse powder of the falling reflux, thereby improving the air outlet efficiency of the pulverizing system and reducing the energy consumption of pulverizing.

[0017] By setting up an inspection port, and the return hood being composed of eight return hood single pieces, the staff can install and disassemble the return hood at the inspection port by simply opening the sealing door panel. Through the setting of the gripper and the rotatability of the rotating ring plate, the staff can easily move the designated return hood single piece to the inspection port, and then only need to unscrew the anti-detachment bolt to remove the return hood single piece at that position from the annular mounting frame for inspection and replacement, which makes the maintenance work of the return hood more flexible and greatly reduces the difficulty of inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a reflux isolation type coarse powder separator proposed by the present invention;

[0019] Figure 2 A perspective view of a reflux isolation type coarse powder separator proposed by the present invention;

[0020] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0021] Figure 4 A three-dimensional diagram of a reflux hood in a reflux isolation type coarse powder separator proposed by the present invention;

[0022] Figure 5 A partial structural stereogram of a reflux cover in a reflux isolation type coarse powder separator proposed by the present invention;

[0023] Figure 6 A three-dimensional diagram of an annular mounting frame in a reflux isolation type coarse powder separator proposed by the present invention;

[0024] Figure 7 This is a stereoscopic diagram of a single piece of a reflux cover in a reflux isolation type coarse powder separator proposed by the present invention.

[0025] In the figure: 1 conical cylinder, 2 cylinder cover, 3 air inlet pipe, 4 return pipe, 5 air outlet pipe, 6 transmission box, 7 rotating pipe, 8 flat steel rotor, 9 first gear, 10 second gear, 11 transmission rod, 12 first bevel gear, 13 first motor, 14 second bevel gear, 15 lifting rod, 16 fixing rod, 17 fixing ring plate, 18 rotating ring plate, 19 limiting block, 20 bolt hole, 21 return cover single piece, 211 arc plate, 212 upper arc plate, 213 lower arc plate, 22 installation port, 23 anti-slip bolt, 24 gripper, 25 end plate, 26 threaded rod, 27 fixing frame, 28 second motor, 29 inspection port, 30 sealing door plate, 31 support platform. DETAILED DESCRIPTION

[0026] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0027] Reference Figure 1-Figure 7 A reflux isolation type coarse powder separator comprises a conical cylinder 1, the upper end of the conical cylinder 1 is connected with a cylinder cover 2, the lower end center of the conical cylinder 1 is connected with an air inlet pipe 3 for inputting coal powder and wind, the lower end of the conical cylinder 1 and one side of the air inlet pipe 3 is connected with a reflux pipe 4 for collecting coarse coal powder and returning it to the grinding equipment, and one side of the cylinder cover 2 is connected with an air outlet pipe 5 for outputting fine coal powder and wind. A transmission box 6 is fixedly connected to the inner top wall of the cylinder cover 2, and a rotating tube 7 is rotatably connected to the center position of the cylinder cover 2. The rotating tube 7 vertically penetrates the transmission box 6 and is rotatably connected thereto. A flat steel rotor 8 is fixedly sleeved on the part of the rotating tube 7 located below the transmission box 6. The flat steel rotor 8 rotates synchronously with the rotating tube 7. The flat steel rotor 8 in the rotating state can centrifugally separate the coal powder entering the conical cylinder 1, and the coarse powder with large mass can be thrown toward the inner wall of the conical cylinder 1 under the action of centrifugal force, and then gradually falls to the bottom of the conical cylinder 1 under the action of gravity and enters the reflux pipe 4. The fine coal powder continues to rise to the cylinder cover 2 under the push of wind force, and is transported to the collection container through the air outlet pipe 5.

[0028] A first gear 9 is fixedly sleeved on the rotating tube 7 and in the transmission box 6, and a second gear 10 is meshed on one side of the first gear 9. A transmission rod 11 is coaxially fixed and penetrated on the second gear 10. The lower end of the transmission rod 11 is rotatably connected to the inner bottom wall of the transmission box 6, and the upper end of the transmission rod 11 penetrates the cylinder cover 2 and is rotatably connected thereto. A first bevel gear 12 is fixedly sleeved on the upper end of the transmission rod 11, and a first motor 13 is fixedly installed on the upper end of the cylinder cover 2. A second bevel gear 14 is fixedly sleeved on the output end of the first motor 13, and the second bevel gear 14 is vertically meshed with the first bevel gear 12. The first motor 13 can directly drive the transmission rod 11 to rotate through the meshing of the second bevel gear 14 and the first bevel gear 12. The transmission rod 11 can drive the rotating tube 7 to rotate through the meshing of the second gear 10 and the first gear 9, and then the first motor 13 can control the rotation of the rotating tube 7 and the flat steel rotor 8, thereby performing coarse powder separation of coal powder.

[0029] A lifting rod 15 penetrating the rotating tube 7 is vertically slidably connected inside the rotating tube 7, and the lifting rod 15 can be vertically lifted and lowered under the limit of the rotating tube 7. An annular mounting frame is provided at the lower end of the lifting rod 15, and the annular mounting frame includes four fixed rods 16 fixedly connected to the lower end of the lifting rod 15 and distributed in a cross shape. The four fixed rods 16 are commonly fixedly connected to a fixed ring plate 17 at one end away from the lifting rod 15. The outer circumference of the fixed ring plate 17 is rotatably connected to a rotating ring plate 18 arranged concentrically therewith, and the rotating ring plate 18 can rotate outside the fixed ring plate 17. A reflow hood is installed on the outer peripheral surface of the rotating ring plate 18. The reflow hood is in a bucket shape that is wide at the top and narrow at the bottom. The reflow hood is spaced apart from the inner wall of the conical cylinder 1. The gap between the reflow hood and the conical cylinder 1 constitutes a coarse powder flow channel after separation. When the flat steel rotor 8 rotates to separate the coarse powder, the coal powder with a larger mass in the air-powder two-phase flow that has just entered the conical cylinder 1 through the air inlet pipe 3 can directly fall to the bottom of the conical cylinder 1 under the action of gravity for reflux, and the remaining coal powder can move up through the reflow hood under the action of wind and enter the flat steel rotor 8. Under the centrifugal action of the flat steel rotor 8, the remaining coarse coal powder is thrown outward under the action of centrifugal force and gradually falls under the action of weight. During the falling process, it can gradually contact the inner wall of the conical cylinder 1 and the outer wall of the reflow hood, and then gradually move down to the bottom of the conical cylinder 1 in the gap formed by the two, completing the reflux of the coarse powder. The coarse powder separation work under this mode can avoid the intersection of the two-phase flow just entering the conical cylinder 1 and the coarse powder falling backflow, thereby improving the air outlet efficiency of the powder making system and reducing the energy consumption of powder making.

[0030] The reflux hood is composed of eight reflux hood single pieces 21 of the same size. The reflux hood single piece 21 is composed of an upper arc plate 212, an arc plate 211 and a lower arc plate 213 welded to each other from top to bottom. The arc plate 211 is parallel to and fits the rotating ring plate 18. The upper arc plate 211 and the lower arc plate 213 are both inclined toward the inner side of the conical cylinder 1, and the lower arc plate 213 is longer. The upper arc plate 211 set in this way can make the coarse powder centrifugally separated by the flat steel rotor 8 fall into the gap between the reflux hood and the conical cylinder 1 as much as possible, avoiding intersection with the fine powder in the two-phase flow in the rigid conical cylinder 1.

[0031] Eight evenly distributed limit blocks 19 are fixedly connected to the outer circumference of the rotating ring plate 18, bolt holes 20 are opened on the outer circumference of the rotating ring plate 18 and at the upper and lower positions of each limit block 19, and a mounting opening 22 matching the limit block 19 is opened on the arc plate 211, and each limit block 19 passes through the corresponding mounting opening 22 respectively, and anti-slip bolts 23 are provided on each arc plate 211 and at the upper and lower positions of the mounting opening 22, and each anti-slip bolt 23 is threadedly connected with the corresponding bolt hole 20, and grippers 24 are fixedly connected on each arc plate 211 and at the positions on both sides of the mounting opening 22. The setting of the limit blocks 19 and the mounting opening 22 facilitates the installation of the return cover single piece 21. The return cover single piece 21 can be hung on the rotating ring plate 18 by simply aligning the mounting opening 22 with the corresponding limit blocks 19, and then the two anti-slip bolts 23 can be screwed into the corresponding bolt holes 20 to complete the fixing of the return cover single piece 21.

[0032] An inspection port 29 is provided on the outer peripheral surface of the conical cylinder 1, and a sealing door plate 30 is provided in the inspection port 29. Specifically, the staff only needs to open the sealing door plate 30, and can install and disassemble the return hood at the position of the inspection port 29. Through the setting of the gripper 24 and the rotatability of the rotating ring plate 18, the staff can easily move the designated return hood single piece 21 to the position of the inspection port 29, so that the return hood single piece 21 at this position can be removed from the annular mounting frame by only unscrewing the anti-detachment bolt 23, so as to carry out inspection and replacement work, which makes the maintenance work of the return hood more flexible and greatly reduces the difficulty of inspection.

[0033] An end plate 25 is fixedly connected to the upper end of the lifting rod 15, and a threaded rod 26 vertically penetrates and is threadedly connected to the end plate 25, the lower end of the threaded rod 26 is rotatably connected to the cylinder cover 2, and a fixing frame 27 is fixedly connected to the upper end of the cylinder cover 2, the upper end of the threaded rod 26 is rotatably connected to the fixing frame 27, and a second motor 28 that drives the threaded rod 26 to rotate is fixedly installed on the fixing frame 27. The threaded rod 26 plays a role in supporting the return hood, and the staff only needs to drive the threaded rod 26 to work through the second motor 28 to drive the lifting rod 15 to move vertically, so as to adjust the position height of the return hood, so as to make it closer to the inspection port 29, so as to facilitate the inspection work.

[0034] A rectangular support platform 31 is provided on the outside of the conical cylinder 1, and the inner side of the support platform 31 is fixedly connected to the outer wall of the conical cylinder 1. The support platform 31 supports the conical cylinder 1 and facilitates manual maintenance by climbing onto the support platform 31 and performing maintenance work at the maintenance port 29.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reflux isolation type coarse powder separator, comprising a conical cylinder (1), characterized in that: The upper end of the conical cylinder (1) is connected to a cylinder cover (2), the lower end of the conical cylinder (1) is connected to an air inlet pipe (3) at the center, the lower end of the conical cylinder (1) and at a position on one side of the air inlet pipe (3) are connected to a return pipe (4), one side of the cylinder cover (2) is connected to an air outlet pipe (5), a transmission box (6) is fixedly connected to the inner top wall of the cylinder cover (2), a rotating tube (7) is rotatably connected to the center of the cylinder cover (2), the rotating tube (7) vertically penetrates the transmission box (6) and is rotatably connected thereto, and a flat steel rotor (8) is fixedly sleeved on the portion of the rotating tube (7) located below the transmission box (6); A lifting rod (15) penetrating the rotating tube (7) is vertically slidably connected inside the rotating tube (7), and an annular mounting frame is provided at the lower end of the lifting rod (15), and the annular mounting frame includes four fixed rods (16) fixedly connected to the lower end of the lifting rod (15) and distributed in a cross shape, and one end of the four fixed rods (16) away from the lifting rod (15) is commonly fixedly connected to a fixed ring plate (17), and the outer peripheral surface of the fixed ring plate (17) is rotatably connected to a rotating ring plate (18) arranged concentrically therewith, and a reflow hood is installed on the outer peripheral surface of the rotating ring plate (18), and the reflow hood is in a bucket shape with a width at the top and a narrowness at the bottom, and the reflow hood is spaced apart from the inner wall of the conical cylinder (1); The upper end of the lifting rod (15) is fixedly connected to an end plate (25), a threaded rod (26) vertically penetrates the end plate (25) and is threadedly connected, the lower end of the threaded rod (26) is rotatably connected to the cylinder cover (2), the upper end of the cylinder cover (2) is fixedly connected to a fixing frame (27), the upper end of the threaded rod (26) is rotatably connected to the fixing frame (27), and a second motor (28) for driving the threaded rod (26) to rotate is fixedly mounted on the fixing frame (27).

2. A reflux isolation type coarse powder separator according to claim 1, characterized in that: A first gear (9) is fixedly sleeved on the rotating tube (7) and in the transmission box (6); a second gear (10) is meshed on one side of the first gear (9); a transmission rod (11) is coaxially fixedly passed through the second gear (10); the lower end of the transmission rod (11) is rotationally connected to the inner bottom wall of the transmission box (6); the upper end of the transmission rod (11) passes through the cylinder cover (2) and is rotationally connected thereto; a first bevel gear (12) is fixedly sleeved on the upper end of the transmission rod (11); a first motor (13) is fixedly installed on the upper end of the cylinder cover (2); a second bevel gear (14) is fixedly sleeved on the output end of the first motor (13); and the second bevel gear (14) is vertically meshed with the first bevel gear (12).

3. A reflux isolation type coarse powder separator according to claim 1, characterized in that: The return hood is formed by splicing eight return hood single pieces (21) of the same size. The return hood single piece (21) is composed of an upper arc plate (212), an arc plate (211) and a lower arc plate (213) which are welded to each other from top to bottom. The arc plate (211) is parallel to and fitted with the rotating ring plate (18). Both the upper arc plate (211) and the lower arc plate (213) are inclined toward the inner side of the conical cylinder (1).

4. A reflux isolation type coarse powder separator according to claim 3, characterized in that: Eight evenly distributed limiting blocks (19) are fixedly connected to the outer circumference of the rotating ring plate (18); bolt holes (20) are provided on the outer circumference of the rotating ring plate (18) and at upper and lower positions of each limiting block (19); a mounting opening (22) matching the limiting block (19) is provided on the arc plate (211); each limiting block (19) is respectively arranged through the corresponding mounting opening (22); and anti-slip bolts (23) are provided on each arc plate (211) and at upper and lower positions of the mounting opening (22); each anti-slip bolt (23) is threadedly connected to the corresponding bolt hole (20).

5. The reflux isolation type coarse powder separator according to claim 3, characterized in that: Grippers (24) are fixedly connected to each of the arc-shaped plates (211) and at positions on both sides of the installation opening (22).

6. The reflux isolation type coarse powder separator according to claim 1, characterized in that: An inspection opening (29) is provided on the outer peripheral surface of the conical cylinder (1), and a sealing door plate (30) is provided in the inspection opening (29).

7. The reflux isolation type coarse powder separator according to claim 1, characterized in that: A rectangular support platform (31) is provided on the outside of the conical cylinder (1), and the inside of the support platform (31) is fixedly connected to the outer wall of the conical cylinder (1).

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