CN112403659A - Nozzle ring movable vane anti-abrasion cover of medium-speed coal mill - Google Patents
Nozzle ring movable vane anti-abrasion cover of medium-speed coal mill Download PDFInfo
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- CN112403659A CN112403659A CN202011323652.0A CN202011323652A CN112403659A CN 112403659 A CN112403659 A CN 112403659A CN 202011323652 A CN202011323652 A CN 202011323652A CN 112403659 A CN112403659 A CN 112403659A
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- Prior art keywords
- wear
- tile
- ring
- nozzle ring
- coal mill
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a nozzle ring movable vane anti-abrasion cover of a medium-speed coal mill, which comprises a first anti-abrasion tile and a second anti-abrasion tile, wherein the first anti-abrasion tile and the second anti-abrasion tile form an anti-abrasion cover which is arranged on a movable ring vane of the medium-speed coal mill in a covering manner, and a top space of the anti-abrasion cover is provided with a wear-resistant high polymer material in a pouring manner. The movable ring wear-resistant device is suitable for wear resistance of the movable ring of the medium-speed coal mill, can effectively protect the easily-worn part of the movable ring of the medium-speed coal mill, enhances the wear-resistant capability of the wind ring, prolongs the service time of the movable ring, and reduces the maintenance frequency of the medium-speed coal mill.
Description
Technical Field
The invention belongs to the technical field of abrasion resistance, and particularly relates to an abrasion-resistant cover for a nozzle ring movable vane of a medium-speed coal mill.
Background
The milling part of the medium-speed roller disc type coal mill consists of a rotating grinding ring and three fixed and rotatable grinding rollers which roll along the grinding ring. Raw coal to be ground falls onto a grinding ring from a central coal dropping pipe of the coal mill, the rotary grinding ring moves the raw coal to a grinding raceway by virtue of centrifugal force, and the raw coal is ground by a grinding roller. The three grinding rollers are uniformly distributed on the grinding disc roller path along the circumferential direction, the grinding force is generated by a hydraulic loading system, the grinding force is uniformly applied to the three grinding rollers through a static three-point system, and the force is transmitted to the foundation through the grinding ring, the grinding rollers, the pressing frame, the pull rod, the transmission disc, the speed reducer and the hydraulic cylinder. The grinding and drying of raw coal are carried out simultaneously, primary air uniformly enters the periphery of a grinding ring through a nozzle ring, a pulverized coal mixture which is cut from the grinding ring by grinding and thrown out is dried and conveyed to a separator at the upper part of a coal mill for separation, coarse powder is separated out and returns to the grinding ring for regrinding, and qualified fine powder is taken out of the separator by the primary air. The heavy pebble coal, pyrite, iron blocks and the like which are difficult to crush and cannot be blown up by primary air fall into the primary air chamber through the nozzle ring and are scraped into the slag discharging box by the scraper.
The nozzle ring is used for rectifying hot primary air to form high-speed upward and rotating air flow, blowing the light-density coal powder mixture flowing through the nozzle ring, conveying the mixture to a separator for separation, and allowing the heavy-density stone coal, pyrite, iron blocks and the like to fall into a primary air chamber through the nozzle ring. To realize the functions, the primary wind speed at the outlet of the nozzle ring is very high and is usually 60-90 m/s, the specific wind speed is determined by coal and a coal mill structure, and the flow area of the nozzle ring is a fixed value after the wind speed is determined. Under the combined action of high wind speed and pulverized coal mixture, the tops of the nozzle ring blades which can contact pulverized coal are seriously abraded, and once the abrasion of the nozzle ring exceeds the standard, the flow area of the nozzle ring is too large, so that the primary wind speed is lower. The pulverized coal mixture cannot be blown up, the qualified pulverized coal cannot be effectively separated, the output force of the coal mill is reduced, and a large amount of coal particles leak into the primary air chamber from the nozzle ring to cause the blockage of the coal mill. Generally 10000 hours must be changed the nozzle cascade, adopt wear-resisting metal material preparation nozzle cascade life to reach 30000 hours, but the later stage of wearing and tearing coal grinding stone coal volume is very big, influences coal pulverizer and exports power and boiler efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the anti-abrasion cover for the nozzle ring movable vane of the medium-speed coal mill, aiming at the defects in the prior art, so that the easily-abraded part of the nozzle ring movable vane of the medium-speed coal mill is effectively protected, the wear resistance of the nozzle ring is enhanced, the service time of the nozzle ring is prolonged, and the maintenance frequency of the medium-speed coal mill is reduced.
The invention adopts the following technical scheme:
the utility model provides a medium speed pulverizer nozzle ring movable vane abrasionproof cover, includes first abrasionproof tile and second abrasionproof tile, and first abrasionproof tile and second abrasionproof tile are constituteed the abrasionproof cover and are covered the setting on the rotating ring blade of medium speed pulverizer, and first abrasionproof tile sets up in the windward side department of every rotating ring blade, and second abrasionproof tile corresponds the leeward side department that sets up at every rotating ring blade, and the headspace watering of abrasionproof cover is provided with wear-resisting macromolecular material.
Specifically, be provided with the abrasionproof tile fixed orifices on first abrasionproof tile and the second abrasionproof tile respectively, through fixing bolt respectively with first abrasionproof tile and second abrasionproof tile and rotating ring blade fixed connection.
Specifically, first abrasionproof tile and second abrasionproof tile are L type structure, and the angle of first abrasionproof tile and the angle of second abrasionproof tile structural connection department is the same with the angle of rotating ring blade.
Furthermore, the angle of the joint of the first abrasion-proof tile structure is an obtuse angle, and the angle of the joint of the second abrasion-proof tile structure is an acute angle.
Specifically, the first abrasion-proof tile and the second abrasion-proof tile are made of abrasion-proof ceramics, cast stone, abrasion-proof high polymer materials or abrasion-proof composite materials.
Specifically, a primary air channel is arranged between two adjacent moving ring blades.
Specifically, the moving ring blade is in a comma-shaped structure.
Specifically, the rotating ring blade interval sets up in the outside of nozzle ring rotating ring, is located between nozzle ring rotating ring and the quiet ring of nozzle ring, and the nozzle ring rotating ring is installed on the mill, and the quiet ring of nozzle ring sets up on the coal pulverizer housing in the nozzle ring rotating ring outside.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the nozzle ring movable vane anti-abrasion cover of the medium-speed coal mill, the first anti-abrasion tile and the second anti-abrasion tile are respectively and correspondingly arranged on the windward side and the leeward side of each movable ring vane to protect the movable vanes, the easily-abraded surfaces of the nozzle ring vanes are completely covered, a pulverized coal mixture and easily-abraded metal parts are isolated, the anti-abrasion capacity of the wind ring is enhanced, the service time of the movable ring is prolonged, and the maintenance frequency of the medium-speed coal mill is reduced.
Furthermore, the first abrasion-proof tile and the second abrasion-proof tile are fixedly connected with the moving ring blade through bolts, so that the moving ring blade is further protected.
Furthermore, the angle of the structural connection part of the first anti-abrasion tile and the second anti-abrasion tile is the same as that of the movable ring blade, so that the first anti-abrasion tile and the second anti-abrasion tile can perfectly cover the easy-to-wear surface of the movable ring blade, and the anti-abrasion effect is achieved.
Furthermore, the first abrasion-proof tile is an obtuse angle, the second abrasion-proof tile is an acute angle, and the shape and the angle of the abrasion-proof tile correspond to those of the easy-to-wear surface of the movable ring blade, so that complete coverage is realized.
Furthermore, the first abrasion-proof tile and the second abrasion-proof tile are made of abrasion-proof materials, and abrasion resistance is further improved.
Furthermore, the moving ring blades are provided with primary air channels at intervals, and primary air can be rectified and accelerated.
Furthermore, the movable ring blade is of a comma-type structure, and the aim of the movable ring blade is to form a better fluid channel between the two blades.
Furthermore, the rotating ring blades are arranged outside the nozzle ring rotating ring at intervals, the nozzle ring rotating ring is installed on the grinding disc, a nozzle ring static ring is arranged on a shell of the coal mill outside the nozzle ring rotating ring, and the nozzle ring static ring are connected with each other to form a dynamic and static sealing structure.
In conclusion, the movable ring wear-resistant device is suitable for wear resistance of the movable ring of the medium-speed coal mill, can effectively protect the easily worn part of the movable ring of the medium-speed coal mill, enhances the wear-resistant capability of the wind ring, prolongs the service time of the movable ring and reduces the maintenance frequency of the medium-speed coal mill.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural view of a nozzle ring vane wear-proof cover of a high-speed coal mill in the invention;
FIG. 2 is a schematic view showing the ring-shaped expansion of a nozzle ring of the rapid coal mill according to the present invention;
FIG. 3 is a schematic diagram of the position of the nozzle ring of the high-speed coal mill easy to wear in the invention;
FIG. 4 is a partial enlarged view of a nozzle ring vane wear-resistant cover of the high-speed coal mill of the present invention;
FIG. 5 is a cross-sectional view of a nozzle ring vane wear cover of the high speed coal pulverizer of the present invention;
FIG. 6 is a second cross-sectional view of a nozzle ring vane wear cover of the high speed coal mill of the present invention;
FIG. 7 is a cross-sectional view of an anti-wear tile of the nozzle ring vane anti-wear cover of the high-speed coal mill of the present invention.
FIG. 8 is a sectional view of a wear-resistant tile of the nozzle ring vane wear-resistant cover of the high-speed coal mill.
Wherein: 1. a grinding disc; 2. a nozzle ring moving ring; 3. a nozzle ring stationary ring; 4. a moving ring blade; 5. a primary air channel; 6. an anti-wear cover; 7. a first wear tile; 8. a second wear tile; 9. fixing the bolt; 10. wear-resistant tile fixing holes.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a nozzle ring movable vane anti-abrasion cover of a medium-speed coal mill, which is suitable for being anti-abraded with nozzle ring movable ring vanes of the medium-speed coal mill, effectively protects easily-abraded parts of the nozzle ring movable ring vanes of the medium-speed coal mill, enhances the anti-abrasion capacity of a nozzle ring, prolongs the service time of the nozzle ring, and reduces the maintenance frequency of the medium-speed coal mill.
Referring to fig. 1 and 2, the nozzle ring movable vane anti-abrasion cover of the medium-speed coal mill of the present invention comprises a grinding disc 1, a nozzle ring movable ring 2, a nozzle ring static ring 3, movable ring vanes 4, a primary air channel 5 and an anti-abrasion cover 6, wherein the nozzle ring movable ring 2 is installed on the grinding disc 1, and the nozzle ring static ring 3 is installed on a coal mill housing and keeps a fixed distance from the nozzle ring movable ring 2; comma-shaped moving ring blades 4 are arranged outside the nozzle ring moving ring 2 at intervals, a primary air channel 5 is arranged between every two moving ring blades 4, and an anti-abrasion cover 6 is arranged at the upper part of each moving ring blade 4.
Referring to fig. 6, the wear-resistant cover 6 includes a first wear-resistant tile 7 and a second wear-resistant tile 8, the first wear-resistant tile 7 and the second wear-resistant tile 8 can be spliced to cover the moving ring blade 4, the first wear-resistant tile 7 and the second wear-resistant tile 8 are made of wear-resistant materials such as wear-resistant ceramics, cast stone, wear-resistant high polymer materials and wear-resistant composite materials, and the first wear-resistant tile 7 and the second wear-resistant tile 8 are manufactured according to the shape and size of the moving ring blade 4.
The first abrasion-proof tile 7 and the second abrasion-proof tile 8 are respectively fixed on the moving ring blade 4 by fixing bolts 9; after the first abrasion-proof tile 7 and the second abrasion-proof tile 8 are fixed by the fixing bolt 9, the top space is poured by an abrasion-resistant high polymer material, and the abrasion-resistant high polymer material is preferably polyether-ether-ketone.
The first abrasion-proof tile 7 is an obtuse angle abrasion-proof tile, the second abrasion-proof tile 8 is an acute angle abrasion-proof tile, and the angles of the first abrasion-proof tile 7 and the second abrasion-proof tile 8 are the same as the angle of the blade.
Referring to fig. 3, the first abrasion-proof tile 7 and the second abrasion-proof tile 8 cover the windward side and the leeward side of each moving-ring blade 4, respectively, and the first abrasion-proof tile 7 and the second abrasion-proof tile 8 are tightly fitted to cover the easy-to-wear surface on the upper portion of the whole blade.
Referring to fig. 4, the first anti-wear tile 7 and the second anti-wear tile 8 have fixing holes 10 for fixing in the middle, and are fastened and connected to the moving ring blade 4 through fixing bolts 9.
Referring to fig. 5 and 7, a first installation manner of the wear-resistant cover 6 is to reserve an installation position of a wear-resistant tile when the moving ring blade 4 is manufactured, and is suitable for use in new installation.
Referring to fig. 8, the second wear cover 6 is installed in a modified manner on the coal pulverizer.
The installation method of the nozzle ring movable vane anti-abrasion cover of the high-speed coal mill comprises the following steps:
1. measuring the size and the shape of a moving ring blade of a nozzle ring of a coal mill;
2. designing the shape and size of the wear-resistant cover according to the size and shape of the vanes of the nozzle ring moving ring of the coal mill;
3. manufacturing a nozzle ring wear-resistant cover;
4. the abrasion-proof cover is required to be installed and fixed in the hole punching way of the movable ring blade;
5. and (5) pouring the mounting hole by using a wear-resistant high polymer material, and making the fixing bolt to be wear-resistant.
In conclusion, the nozzle ring and movable vane anti-abrasion cover for the medium-speed coal mill disclosed by the invention completely covers the easily-abraded surface of the nozzle ring vane, separates a pulverized coal mixture and an easily-abraded metal part, enhances the anti-abrasion capacity of the wind ring, prolongs the service time of the moving ring and reduces the maintenance frequency of the medium-speed coal mill.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides a medium speed pulverizer nozzle ring movable vane abrasionproof cover, a serial communication port, including first abrasionproof tile (7) and second abrasionproof tile (8), abrasionproof cover (6) is constituteed in first abrasionproof tile (7) and second abrasionproof tile (8) and is covered and set up on medium speed pulverizer's rotating ring blade (4), first abrasionproof tile (7) set up in the windward side department of every rotating ring blade (4), second abrasionproof tile (8) correspond the leeward side department that sets up in every rotating ring blade (4), the headspace watering of abrasionproof cover (6) is provided with wear-resisting macromolecular material.
2. The nozzle ring bucket anti-wear cover of the medium speed coal mill according to claim 1, wherein the first anti-wear tile (7) and the second anti-wear tile (8) are respectively provided with an anti-wear tile fixing hole (10), and the first anti-wear tile (7) and the second anti-wear tile (8) are respectively and fixedly connected with the moving ring blade (4) through fixing bolts (9).
3. The nozzle ring bucket anti-wear cover of the medium speed coal mill according to claim 1, characterized in that the first anti-wear tile (7) and the second anti-wear tile (8) are of L-shaped structures, and the angle of the structural connection of the first anti-wear tile (7) and the second anti-wear tile (8) is the same as the angle of the moving ring blade (4).
4. The nozzle ring bucket wear cover of the medium speed coal mill according to claim 3, wherein the angle at the joint of the first wear-resistant tile (7) structure is an obtuse angle, and the angle at the joint of the second wear-resistant tile (8) structure is an acute angle.
5. The nozzle ring bucket anti-wear cover of the medium speed coal mill as claimed in claim 1, wherein the first anti-wear tile (7) and the second anti-wear tile (8) are made of wear-resistant ceramics, cast stone, wear-resistant high polymer materials or wear-resistant composite materials.
6. The nozzle ring bucket anti-wear cover of the medium speed coal mill is characterized in that a primary air channel (5) is arranged between two adjacent moving ring blades (4).
7. The nozzle ring bucket anti-wear cover of the medium speed coal mill is characterized in that the moving ring blades (4) are of a comma-type structure.
8. The nozzle ring bucket wear cover of the medium speed coal mill according to claim 1, wherein the moving ring blades (4) are arranged outside the nozzle ring moving ring (2) at intervals and located between the nozzle ring moving ring (2) and the nozzle ring static ring (3), the nozzle ring moving ring (2) is installed on the grinding disc (1), and the nozzle ring static ring (3) is arranged on the coal mill shell outside the nozzle ring moving ring (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323652.0A CN112403659A (en) | 2020-11-23 | 2020-11-23 | Nozzle ring movable vane anti-abrasion cover of medium-speed coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323652.0A CN112403659A (en) | 2020-11-23 | 2020-11-23 | Nozzle ring movable vane anti-abrasion cover of medium-speed coal mill |
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| CN112403659A true CN112403659A (en) | 2021-02-26 |
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| CN202011323652.0A Pending CN112403659A (en) | 2020-11-23 | 2020-11-23 | Nozzle ring movable vane anti-abrasion cover of medium-speed coal mill |
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|---|---|---|---|---|
| US4807815A (en) * | 1985-04-03 | 1989-02-28 | Magyar Aluminiumipari Troszt | Air-jet mill and associated pregrinding apparatus for comminuating solid materials |
| JPH0240243A (en) * | 1988-07-01 | 1990-02-09 | Deutsche Babcock Werke Ag | Roll tray type mill |
| CN203235517U (en) * | 2013-04-28 | 2013-10-16 | 天津大唐国际盘山发电有限责任公司 | Anti-drop groove type static nozzle ring for roll mill pulverizer |
| CN203342871U (en) * | 2013-04-26 | 2013-12-18 | 徐军 | Anti-abrasion structure for movable nozzle ring and stationary ring in medium-speed coal mill |
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| CN210434622U (en) * | 2019-04-24 | 2020-05-01 | 哈尔滨博深科技发展有限公司 | ZGM type medium speed coal mill wind ring device |
| CN213996237U (en) * | 2020-11-23 | 2021-08-20 | 西安建筑科技大学 | Nozzle ring movable vane anti-abrasion cover of coal mill |
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2020
- 2020-11-23 CN CN202011323652.0A patent/CN112403659A/en active Pending
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