CN215694473U - Adjustable picture peg structure of coal pulverizer rotating ring - Google Patents
Adjustable picture peg structure of coal pulverizer rotating ring Download PDFInfo
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- CN215694473U CN215694473U CN202122352940.5U CN202122352940U CN215694473U CN 215694473 U CN215694473 U CN 215694473U CN 202122352940 U CN202122352940 U CN 202122352940U CN 215694473 U CN215694473 U CN 215694473U
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Abstract
The utility model discloses an adjustable inserting plate structure of a moving ring of a coal mill, wherein a circle of air passage inner wall and a circle of air passage outer wall are integrally extended downwards on the moving ring along the axial direction of a grinding disc, a plurality of air passage side walls are uniformly distributed between the air passage outer wall and the air passage inner wall at equal intervals along the radial direction of the grinding disc, and a plurality of fan-shaped air passages are formed by combining the air passage outer wall and the air passage inner wall; an inserting plate notch is transversely arranged on the outer wall of the air passage of a part of the air passage, and a movable inserting plate is horizontally inserted from the inserting plate notch along the radial direction of the grinding disc and is used for adjusting primary air volume according to the load change of coal types and/or units; the flow velocity of the outlet of the moving ring of the coal mill is improved by adjusting the area of the moving ring air passage, so that the adaptability of the coal mill to different coal types and operation conditions is improved, the aims of improving the output, current and inlet-outlet differential pressure of the coal mill under different working conditions are finally fulfilled, the primary air powder conveying efficiency is improved, the power consumption of an auxiliary machine is reduced, and the maintenance cost is reduced; the structure is simple, the installation is convenient, and the grinding can be stopped and adjusted at any time.
Description
Technical Field
The utility model relates to the field of coal mills, in particular to an adjustable flashboard structure of a movable ring of a coal mill.
Background
The coal mill can provide pulverized coal fuel for a boiler and is used for bearing a series of functions of milling, drying, screening, conveying pulverized coal and the like, for example, a medium-speed vertical coal mill and the like; the main working process of the coal mill is as follows: raw coal falls into the center of the rotary millstone from the coal dropping pipe, enters the grinding roller and the grinding track of the millstone under the action of centrifugal force, is rolled and ground into coal powder, the coal powder is dried by primary air sprayed from the driven ring and spirally rises clockwise to enter the separator for separation and screening, so that qualified coal powder is fed into the hearth, unqualified coal powder returns to the grinding area, and pebble coal falls into the primary air chamber through the throat of the movable ring and is brought into the slag discharging box by the scraper plate and finally is discharged through the slag discharging door.
From above, wind has played crucial effect in the powder making link, wind for rationally organizing, the rotating ring (also called wind ring, impeller, nozzle etc.) has been arranged in the outside of mill to the coal pulverizer, quiet ring is then installed on the section of thick bamboo wall of coal pulverizer, keep having less clearance between quiet ring and the rotating ring, wind gets into the coal pulverizer through a plurality of air flues of rotating ring once, after the rotating ring is passed through, the speed of wind increases, obtain circumference and radial minute speed simultaneously, after the intensive mixing with the buggy, get into the powder conveying pipeline through the separator.
The existing primary air system has the following defects: the coal mill in the prior art has the advantages that the primary air speed at the outlet of the movable ring is reduced if the primary air quantity is reduced too much, so that the lifting capacity of the primary air to pulverized coal is reduced, the circulation multiplying power of pulverized coal in the mill is increased, the screening capacity of pebble coal is reduced, and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an adjustable flashboard structure of a movable ring of a coal mill, which can quickly adapt to the change of coal quality for combustion and/or the change of unit load and expand the adjustment range of primary air under the condition of not influencing the air speed of a primary air outlet of the movable ring; meanwhile, the device is simple to adjust and convenient to maintain, the operation efficiency of the device can be improved, the energy consumption of the device is reduced, and the maintenance cost is reduced.
The technical scheme of the utility model is as follows: an adjustable flashboard structure of a movable ring of a coal mill comprises a cylinder wall and a grinding disc which are coaxially arranged, wherein the grinding disc is positioned on the inner side of the cylinder wall and can rotate; a circle of static ring is fixed on the inner side of the cylinder wall, a circle of moving ring is integrally connected with the periphery of the grinding disc, and a gap is formed between the moving ring and the static ring; a circle of coaxial air passage inner wall and a circle of coaxial air passage outer wall are integrally extended downwards on the movable ring along the axial direction of the grinding disc, a plurality of air passage side walls are uniformly distributed between the air passage outer wall and the air passage inner wall at intervals along the radial direction of the grinding disc, and a plurality of fan-shaped air passages are formed by combining the air passage outer wall and the air passage inner wall; an inserting plate notch is transversely arranged on the outer wall of the air passage of a part of the air passage, and an inserting plate is horizontally inserted into the air passage from the inserting plate notch along the radial direction of the grinding disc and is used for adjusting primary air volume according to the load change of coal types and/or units.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: a circle of hanging edge extends outwards and transversely integrally at the upper end of the outer wall of the air passage, a vertical bolt through hole is formed in the position, corresponding to the air passage, of the hanging edge, and a bolt is inserted into the bolt through hole; the insert plate is provided with a bolt through hole for the lower end of the adaptive bolt to pass through, and the rear half part of the insert plate is hung at the lower end of the bolt through a nut.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the bolt via hole includes first bolt via hole, and when the lower extreme hoist and mount of bolt were in first bolt via hole, the picture peg inserted the air flue inner wall department of air flue, and the through-flow area of air flue is zero.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the bolt via hole includes second bolt via hole, and when the lower extreme hoist and mount of bolt were in the second bolt via hole, the picture peg inserted the half of air flue, and the through-flow area of air flue is original half.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the bolt via hole includes third bolt via hole, and when the lower extreme hoist and mount of bolt were in the third bolt via hole, the picture peg inserted the two-thirds of air flue, and the through-flow area of air flue is original one-third.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the number of the air passages with the inserting plate notches transversely arranged on the outer walls of the air passages accounts for 20 to 50 percent of the total number of all the air passages.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the plugboard is trapezoidal, and the length of the notch of the plugboard is smaller than the distance between the side walls of two adjacent air passages on the outer wall of the air passage.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the outer wall of the air passage is in an inclined state, and the upper end of the outer wall of the air passage is closer to the inner wall of the air passage.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the upper end of the outer wall of the air passage is higher than the upper end of the inner wall of the air passage, and a transition connection mode of firstly a plane and then an inclined plane is adopted between the upper end of the outer wall of the air passage and the top surface of the rotating ring.
The adjustable picture peg structure of coal pulverizer rotating ring, wherein: the cross section of the static ring is vertically trapezoidal, and the side length of one side of the static ring facing the dynamic ring is shorter.
Compared with the coal mill and the primary air system thereof in the prior art, the movable ring adjustable inserting plate structure of the coal mill has the beneficial effects that: the flow velocity of the outlet of the moving ring of the coal mill is improved by adjusting the area of the moving ring air passage, so that the adaptability of the coal mill to different coal types and operation conditions is improved, the aims of improving the output, current and inlet-outlet differential pressure of the coal mill under different working conditions are finally fulfilled, the primary air powder conveying efficiency is improved, the power consumption of an auxiliary machine is reduced, and the maintenance cost is reduced; the structure is simple and easy, is more convenient to install, and can stop grinding at any time and adjust.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way; the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for aiding the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention; those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the utility model as a matter of case.
FIG. 1 is a schematic sectional structural view of a movable ring adjustable insert plate of a coal mill in a completely blocked state;
FIG. 2 is a schematic structural diagram of a movable ring adjustable insert plate of the coal mill in a half plugging state;
FIG. 3 is a schematic cross-sectional view A-A of FIG. 2 of the present invention;
the various reference numbers in the figures are summarized: the grinding disc comprises a cylinder wall 100, a static ring 110, a grinding disc 200, a dynamic ring 210, an air channel inner wall 211, an air channel outer wall 212, an air channel side wall 213, a hanging edge 214, an air channel 220, an insert plate notch 230, an insert plate 300, a first bolt through hole 310, a second bolt through hole 320, a bolt 410 and a nut 420.
Detailed Description
The embodiments and examples of the present invention will be described in detail below with reference to the accompanying drawings, and the described embodiments are only for the purpose of illustrating the present invention and are not intended to limit the embodiments of the present invention.
Referring to fig. 1 in combination with fig. 2 and 3, the adjustable insert plate structure of the movable ring of the coal mill of the present invention includes a cylinder wall 100 of the coal mill and a grinding disc 200, wherein the grinding disc 200 is rotatably disposed inside the cylinder wall 100; a circle of static rings 110 is fixed on the inner side of the cylinder wall 100, a circle of moving rings 210 is integrally connected with the periphery of the grinding disc 200, and a gap is formed between the moving rings 210 and the static rings 100; a circle of coaxial air channel inner wall 211 and a circle of coaxial air channel outer wall 212 are integrally extended downwards on the movable ring 210 along the axial direction of the grinding disc 200, a plurality of air channel side walls 213 are uniformly distributed between the air channel outer wall 212 and the air channel inner wall 211 at equal intervals along the radial direction of the grinding disc 200, and a plurality of fan-shaped air channels 220 are formed by combining the air channel outer wall 212 and the air channel inner wall 211; an inserting plate notch 230 is transversely arranged on the outer wall 212 of the air flue of the partial air flue 220, and an inserting plate 300 is horizontally inserted into the air flue 220 from the inserting plate notch 230 along the radial direction of the grinding disc 200 and is used for adjusting the primary air volume according to the load change of coal types and/or units.
Further, a circle of hanging edge 214 extends outwards and transversely integrally at the upper end of the air passage outer wall 212, a vertical bolt through hole is formed in the hanging edge 214 corresponding to the position of the air passage 220, and a bolt 410 is inserted into the bolt through hole; the insert plate 300 is provided with a bolt through hole for allowing the lower end of the bolt 410 to pass through, and the rear half part of the insert plate 300 is hung on the lower end of the bolt 410 through a nut 420.
Preferably, the bolt through hole comprises a first bolt through hole 310, when the lower end of the bolt 410 is hung in the first bolt through hole 310, the insertion plate 300 is inserted into the inner wall 211 of the air passage 220, and the flow area of the air passage 220 is zero, that is, the air passage 220 is completely blocked.
Preferably, the bolt through holes include a second bolt through hole 320, when the lower end of the bolt 410 is hung in the second bolt through hole 320, the insert plate 300 is inserted into half of the air passage 220, and the flow area of the air passage 220 is one half of the original area, i.e., a state of blocking one half of the air passage 220.
Preferably, the bolt passing holes include a third bolt passing hole (not shown), when the lower end of the bolt 410 is hung in the third bolt passing hole, the insert plate 300 is inserted into two thirds of the air passage 220, and the flow area of the air passage 220 is one third of the original flow area, i.e., a state of blocking a large part of the air passage 220.
Furthermore, the number of the air passages 220 with the plate inserting slots 230 transversely arranged on the outer wall 212 of each air passage accounts for 20-50% of the total number of all the air passages 220, and the adjusting range of the outlet flow rate of the movable ring (namely the whole air volume of the coal mill) can be controlled between 10-100% by adjusting the plugging position of the plate inserting 300 on each air passage 220, so that the primary air adjusting range is expanded.
Preferably, the inserting plate 300 is trapezoidal and is made of wear-resistant materials; and the length of the insert plate slot 230 is smaller than the distance between two adjacent gas flue side walls 213 on the gas flue outer wall 212.
Preferably, the outer airway wall 212 is inclined, and the upper end of the outer airway wall 212 is closer to the inner airway wall 211.
Preferably, the upper end of the outer wall 212 of the air duct is higher than the upper end of the inner wall 211 of the air duct, and a transition connection mode of first plane and then inclined plane is adopted between the upper end of the outer wall 212 of the air duct and the top surface of the rotating ring 210.
Preferably, the cross section of the stationary ring 110 is a vertical trapezoid, and the side facing the movable ring 210 is shorter.
In the specific embodiment of the movable ring adjustable inserting plate structure of the coal mill, the number of the movable ring air passages provided with the adjusting structures is set according to the requirement when the actual working condition changes; firstly, according to the requirement of reducing primary air volume, the total shielding area is scientifically calculated and determined, then the number of the adjusting plugboards is determined according to the actual air channel quantity and the air channel area, and the whole circle is ensured to be uniformly distributed.
According to the adjustable plug board structure of the movable ring of the coal mill, the primary air outlet area is changed by adjusting the depth of the plug board inserted into the air passage according to the change of the unit load and the coal type information of the coal pulverizing system, the partial movable ring air passage outlet area can be adjusted according to the change of the unit load, the coal type and other operation conditions, the primary air quantity is reduced under the condition of meeting the requirement of the primary air outlet air speed, the movable ring rotates along with the grinding disc, primary air can be organized to enter an internal flow field of the coal mill, the problem that the primary air quantity control of the existing coal pulverizing system cannot be automatically adjusted in real time along with the change of the unit load and/or the coal quantity is effectively solved, the adjusting and adapting capability of the existing coal pulverizing system is improved, and therefore the adaptability, the safety, the reliability, the maintainability and the economical efficiency of the existing coal mill are improved.
For example, the primary air refers to air fed from the lower part of a grate when a grate-fired furnace is burning, or air fed into a hearth together with pulverized coal when pulverized coal is burning, or air fed into the hearth from the fire root when oil or gas fuel is burning; the primary air plays a leading role in the combustion of the boiler, air taken from the environment is sent into an air preheater by a primary fan for heating, and one part of the heated hot air is sent into a coal mill for drying and conveying pulverized coal, namely the hot primary air; the pulverized coal carried by the primary air enters the hearth and then is provided for oxygen combustion through the secondary air.
It should be understood that the above-mentioned embodiments are merely preferred examples of the present invention, and not restrictive, but rather, all the changes, substitutions, alterations and modifications that come within the spirit and scope of the utility model as described above may be made by those skilled in the art, and all the changes, substitutions, alterations and modifications that fall within the scope of the appended claims should be construed as being included in the present invention.
Claims (10)
1. An adjustable flashboard structure of a movable ring of a coal mill comprises a cylinder wall (100) and a grinding disc (200) which are coaxially arranged, wherein the grinding disc (200) is positioned at the inner side of the cylinder wall (100) and can rotate; a circle of static rings (110) are fixed on the inner side of the cylinder wall (100), a circle of moving rings (210) are integrally connected with the periphery of the grinding disc (200), and a gap is formed between the moving rings (210) and the static rings (110); a circle of coaxial air passage inner wall (211) and a circle of air passage outer wall (212) are integrally extended downwards on the movable ring (210) along the axial direction of the grinding disc (200), a plurality of air passage side walls (213) are uniformly distributed between the air passage outer wall (212) and the air passage inner wall (211) at equal intervals along the radial direction of the grinding disc (200), and a plurality of fan-shaped air passages (220) are formed by combining the air passage outer wall (212) and the air passage inner wall (211); the method is characterized in that: an inserting plate notch (230) is transversely arranged on the outer wall of the air flue of the partial air flue (220), and an inserting plate (300) is horizontally inserted into the air flue (220) from the inserting plate notch (230) along the radial direction of the grinding disc (200) and is used for adjusting primary air volume according to the load change of coal types and/or units.
2. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 1, wherein: a circle of hanging edge (214) extends outwards and transversely and integrally from the upper end of the outer wall of the air passage (220), a vertical bolt through hole is formed in the position, corresponding to the air passage (220), of the hanging edge (214), and a bolt (410) is inserted into the bolt through hole; the inserting plate (300) is provided with a bolt through hole for the lower end of the adapting bolt (410) to penetrate through, and the rear half part of the inserting plate (300) is hung at the lower end of the bolt (410) through a nut (420).
3. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 2, wherein: the bolt via hole comprises a first bolt via hole (310), when the lower end of the bolt (410) is hoisted in the first bolt via hole (310), the inserting plate (300) is inserted into the inner wall of the air passage (220), and the flow area of the air passage (220) is zero.
4. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 2, wherein: the bolt via hole includes second bolt via hole (320), and when the lower extreme hoist and mount of bolt (410) were in second bolt via hole (320), picture peg (300) inserted half of air flue (220), and the through-flow area of air flue (220) is original half.
5. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 2, wherein: the bolt via hole includes third bolt via hole, and when the lower extreme hoist and mount of bolt (410) were in the third bolt via hole, picture peg (300) inserted the two-thirds of air flue (220), and the flow area of air flue (220) is original one-third.
6. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 1, wherein: the number of the air passages (220) which are transversely provided with the inserting plate notches (230) on the outer wall (212) of the air passages accounts for 20 to 50 percent of the total number of all the air passages (220).
7. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 1, wherein: the inserting plate (300) is trapezoidal, and the length of the inserting plate notch (230) is smaller than the distance between two adjacent air flue side walls (213) on the air flue outer wall (212).
8. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 1, wherein: the outer wall (212) of the air passage is in an inclined state, and the upper end of the outer wall (212) of the air passage is closer to the inner wall (211) of the air passage.
9. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 1, wherein: the upper end of the air passage outer wall (212) is higher than the upper end of the air passage inner wall (211), and a transition connection mode of firstly making a plane and then making an inclined plane is adopted between the upper end of the air passage outer wall (212) and the top surface of the movable ring (210).
10. The adjustable flashboard structure of the movable ring of the coal mill as claimed in claim 1, wherein: the cross section of the static ring (110) is in a vertically-arranged trapezoid shape, and the side length of one side facing the dynamic ring (210) is shorter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122352940.5U CN215694473U (en) | 2021-09-28 | 2021-09-28 | Adjustable picture peg structure of coal pulverizer rotating ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122352940.5U CN215694473U (en) | 2021-09-28 | 2021-09-28 | Adjustable picture peg structure of coal pulverizer rotating ring |
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| CN215694473U true CN215694473U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122352940.5U Active CN215694473U (en) | 2021-09-28 | 2021-09-28 | Adjustable picture peg structure of coal pulverizer rotating ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116213039A (en) * | 2023-05-08 | 2023-06-06 | 哈尔滨博深科技发展有限公司 | Medium speed pulverizer combination that adaptation multiple coal types used is carried and is imitated wind ring device |
| CN116328902A (en) * | 2023-01-03 | 2023-06-27 | 华能安源发电有限责任公司 | Coal mill and maintenance method for coal mill |
-
2021
- 2021-09-28 CN CN202122352940.5U patent/CN215694473U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116328902A (en) * | 2023-01-03 | 2023-06-27 | 华能安源发电有限责任公司 | Coal mill and maintenance method for coal mill |
| CN116213039A (en) * | 2023-05-08 | 2023-06-06 | 哈尔滨博深科技发展有限公司 | Medium speed pulverizer combination that adaptation multiple coal types used is carried and is imitated wind ring device |
| CN116213039B (en) * | 2023-05-08 | 2023-08-18 | 哈尔滨博深科技发展有限公司 | Medium speed pulverizer combination that adaptation multiple coal types used is carried and is imitated wind ring device |
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