CN208661398U - A kind of intermediate-speed coal mill rotating nozzle structure - Google Patents
A kind of intermediate-speed coal mill rotating nozzle structure Download PDFInfo
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- CN208661398U CN208661398U CN201820263285.1U CN201820263285U CN208661398U CN 208661398 U CN208661398 U CN 208661398U CN 201820263285 U CN201820263285 U CN 201820263285U CN 208661398 U CN208661398 U CN 208661398U
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Abstract
The utility model relates to a kind of intermediate-speed coal mill rotating nozzle structure, it includes: to be equipped with stationary ring at barrel on the inside of the coal pulverizer；Nozzle is equipped on coal pulverizer mill；Air flue is equipped in nozzle；It is equipped with sealing structure in the upper outer of nozzle, and is formed simultaneously vertical gap and horizontal clearance between sealing structure and nozzle；In stationary ring side, it is from top to bottom successively arranged pressing plate, round steel, asbestos packing, stationary ring sealing tooth；Asbestos packing lower part is pressed on stationary ring sealing tooth；Pressing plate lower plane is equipped with plane on stationary ring, to guarantee the sealing on the inside of stationary ring and coal pulverizer between barrel；And baffle ring is equipped on stationary ring；It is equipped with high temperature asbestos washer, between stationary ring and baffle ring to guarantee sealing effect.The utility model improves the sealing effect of dynamic and static czermak space, can save coal pulverizer electricity consumption and with wind, and can improve the wearability and reliability of coal-grinding machine nozzle simultaneously, the significant service life for extending nozzle.
Description
Technical field
The utility model relates to machinery fields, particularly relate to a kind of intermediate-speed coal mill rotating nozzle for thermal power plant
Structure.
Technical background
Coal pulverizer is coal fired power plant pulverized coal preparation system capital equipment.What the country generallyd use is medium-speed vertical coal pulverizer, it is logical
It crosses milling, drying, the choosing of thickness dressing sieve and the supply boiler coal-ash fuel such as transports.This coal pulverizer groundwork process is: need to
Subcommittee-to mill raw coal fallen on mill from the coal spout for being located at coal pulverizer center, mill rotate under the drive of the motor and by means of
Centrifugal force gets rid of raw coal to milling on raceway；Then, it is milled by grinding roller.Work of milling is completed by three grinding rollers, grinding roller
Grinding pressure is provided by spring loads or hydraulic loaded.Raw coal is milled and is dried while carrying out, First air by nozzle uniformly into
Enter around mill, will dry and be delivered to point on coal pulverizer top by the coal dust intermixture tangentially thrown away from mill of milling
From being separated in device.Wherein, the coarse powder in coal dust intermixture is separated, then drops back on mill and refaced, qualified
Fine powder then takes separator out of by First air；And it is difficult to heavier pebble coal, pyrite, the iron block etc. that crush and a wind does not rise
An air compartment is fallen on by nozzle, dreg discharging box is blown by scraper plate, then by artificial periodic cleaning.
The nozzle is the key part of medium-speed vertical coal pulverizer, there is following important function:
A, coal dust in dry coal pulverizer；
B, the fluidized state for maintaining coal dust, makes coal dust flow into means of abrasion；
C, pulverized coal particle is transferred to separator from fluidized bed, and the coal dust of bulky grain separates back means of abrasion again；
D, ground pulverized coal particle is blowed from separator to burner.
Currently, thermal power plant mostly uses open type sound to combine nozzle arrangements, as shown in Figure 1, nozzle 3 ' and mill 5 ' are even
It connects, plays rotation with mill 5 ' when operation, stationary ring 2 ' is connect with medium-speed vertical coal-grinding barrel wall 1 '.Nozzle ' and stationary ring 2 ' between set
Set gap 6 '.Its main problem has: nozzle 3 ' is easily worn, and will lead to can not effectively organize a wind field, causes coal pulverizer logical
Wind resistance increases, pebble coal amount increases, wind powder uniformity is poor, takes the problems such as powder ability decline, so as to cause on coal pulverizer power consumption
It rises, output drop.
Medium-speed vertical coal pulverizer in operation, has the impurity such as pebble coal to fall from from the air flue of nozzle 3 ' 4 ', also has portion
Point impurity is stuck in the 6 ' place of gap of nozzle 3 ' Yu stationary ring 2 ', and carrying cigarette ash secretly in First air can cause to wash away to it, with runing time
Increase, will lead to dynamic and static ring abrasion increase, greatly reduce the service life of Zhong speed Li Shi Nun coal machine nozzle 3 '.In addition, when
After the gap 6 ' of nozzle 3 ' and stationary ring 2 ' is continuously increased, medium-speed vertical coal-grinding machine nozzle 3 ' weakens the organizational capacity of First air,
The powder ability of taking of First air is caused to substantially reduce, wind powder ratio is continuously increased；Medium-speed vertical pulverizer capacity is influenced simultaneously.Wind powder ratio
After increase, primary air fan power consumption will increase；It is unfavorable for realizing the low NO of boiler simultaneouslyXBurning.And after pulverizer capacity is reduced, meeting
Increase station service power consumption rate, increases net coal consumption rate.
Currently, medium-speed pulverizer nozzle is produced frequently with forging type, mostly plain cast iron material, to increase the nozzle longevity
Life, form is generally more heavy, and quality is larger；Motor drives coal pulverizer to rotate together when operation, and energy consumption of electrical machinery is higher.
Summary of the invention
A kind of intermediate-speed coal mill rotating nozzle provided the purpose of the utility model is to overcome the deficiencies in the prior art
Structure, it can reduce First air and leak out, improve First air powder feeding efficiency, and can improve simultaneously coal-grinding machine nozzle wearability and
Reliability, the significant service life for extending nozzle.
The utility model medium-speed pulverizer nozzle arrangements, including coal pulverizer combining nozzle and sealing structure two parts.Sealing
Structure is located at the upper outer of nozzle, and horizontal and vertical gap is formed simultaneously between nozzle；Air flue is located at nozzle interior, nozzle
For segmental structure, every section of nozzle uses composite casting structure, is provided simultaneously with good wear and shock-resistant performance, when operation, nozzle
Portion will be rotated integrally with grinding machine, not occur to rub between sound.To guarantee that stationary ring outer side seal needs, stationary ring and coal-grinding barrel wall
Sealing successively pushes down round steel and asbestos disk using pressing plate, round steel, packing and sealing tooth comprehensive sealing mode, pressing plate from top to bottom
Root, packing are pressed on sealing tooth, fully ensure that the sealing effect on the outside of stationary ring.
For the wear-resisting and sealing effect for guaranteeing sound czermak space, between stationary ring and nozzle, pass through the cooperation of stationary ring and nozzle
Form vertical direction gap, interstice coverage 5-15mm；By cooperating between baffle ring and nozzle, formation horizontal direction gap,
Gap range 5-15mm can guarantee that horizontal and vertical gap can both rub to avoid all directions between dynamic and static ring simultaneously,
The inleakage of dynamic and static gaps can be greatly reduced again.Meanwhile baffle ring is using the high alloy material of wear-resisting property, baffle ring position can be with
Level between digital preservation nozzle and stationary ring and vertical the gap not by the wind erosive wear of powder and impurity, guarantee sound czermak space
Sealing effect, reach maintenance pulverizer capacity, save coal pulverizer electricity consumption and the purpose with wind.
The specific technical solution of the utility model is:
A kind of intermediate-speed coal mill rotating nozzle structure, it includes: to be equipped with stationary ring on the inside of the coal pulverizer at barrel；In coal pulverizer
Mill is equipped with nozzle；In nozzle be equipped with air flue, it is characterised in that: nozzle upper outer be equipped with sealing structure, and
Vertical gap and horizontal clearance are formed simultaneously between sealing structure and nozzle；Sealing structure be in order to guarantee stationary ring outer side seal and
Setting, it includes pressing plate, round steel, asbestos packing, stationary ring sealing tooth, baffle ring, asbestos washer.
Wherein, in stationary ring side, pressing plate, round steel, asbestos packing, stationary ring sealing tooth are from top to bottom successively arranged；Asbestos packing
Lower part is pressed on stationary ring sealing tooth；Pressing plate lower plane is equipped with plane on stationary ring, to guarantee stationary ring and coal pulverizer inboard cylinder
Sealing between wall；And baffle ring is equipped on stationary ring；It is equipped with high temperature asbestos washer, between stationary ring and baffle ring to guarantee sealing effect
Fruit.
Nozzle is formed using bi-material layers composite casting, and wear-resisting alloy material is partially used on nozzle；It is partially adopted under nozzle
With high-performance cast steel material.
The gap of the vertical direction formed between the stationary ring and nozzle, interstice coverage 5-15mm.
The horizontal direction gap formed between the baffle ring and nozzle, interstice coverage 5-15mm, and between horizontal direction
Baffle ring and nozzle position at gap are all made of wear-resisting alloy material.
Utility model has the advantages that the utility model solves problem in the prior art, nozzle and quiet can be protected
By the wind the erosive wear of powder and impurity, the sealing for improving dynamic and static czermak space are not imitated for horizontal clearance and vertical gap between ring
Fruit saves coal pulverizer electricity consumption and uses wind, realizes and reduces First air and leak out, raising First air powder feeding efficiency and can improve simultaneously
The wearability and reliability of coal-grinding machine nozzle, the goal of the invention of the significant service life for extending nozzle.
Detailed description of the invention
Fig. 1 is prior art coal pulverizer partial structure diagram.
Fig. 2 is the utility model coal pulverizer sealing structure and nozzle arrangements schematic diagram.
Fig. 3 is composite casting nozzle arrangements partial schematic diagram in the utility model.
Drawing reference numeral explanation:
Coal-grinding barrel wall 1,1 '；Stationary ring 2,2 '；
Nozzle 3,3 '；Part 31 on nozzle；Part 32 under nozzle；
Air flue 4,4 '；Coal pulverizer mill 5,5 '；Vertical gap 6,6 '；Horizontal clearance 7；
Pressing plate 8；Round steel 9；Asbestos packing 10, stationary ring sealing tooth 11,
Baffle ring 12, asbestos washer 13；Dovetail groove 14.
Specific embodiment
With reference to the accompanying drawings of the specification and embodiment, the utility model is further described.
As shown in Fig. 2, the utility model intermediate-speed coal mill rotating nozzle structure, it includes: on the inside of the coal pulverizer at barrel 1
Equipped with stationary ring 2；Nozzle 3 is equipped on coal pulverizer mill 5；Air flue 4 is equipped on nozzle 3；It is equipped in the upper outer of nozzle 3 close
Seal structure, and vertical gap 6 and horizontal clearance 7 are formed simultaneously between sealing structure and nozzle 3；Sealing structure is to protect
It demonstrate,proves 2 outer side seal of stationary ring and is arranged, it includes pressing plate 8, round steel 9, asbestos packing 10, stationary ring sealing tooth 11, baffle ring 12, asbestos
Gasket 13.
Wherein, in 2 side of stationary ring, pressing plate 8, round steel 9, asbestos packing 10, stationary ring sealing tooth 11 are from top to bottom successively arranged；Stone
10 lower part of cotton packing is pressed on stationary ring sealing tooth 11；8 lower plane of pressing plate is equipped with plane on stationary ring 2, with guarantee stationary ring 2 with
Sealing on the inside of coal pulverizer between barrel 1；And baffle ring 12 is equipped on stationary ring 2；High fire stons is equipped between stationary ring 2 and baffle ring 12
Cotton pad piece 13, to guarantee sealing effect.
Interstice coverage in the vertical gap 6 that stationary ring 2 and 3 top of nozzle are formed are as follows: 5~15mm；In baffle ring 12 and nozzle 3
The interstice coverage for the horizontal clearance 7 that top is formed simultaneously is 5~15mm.Air flue 4 is located inside nozzle 3, and arrow is signified in Fig. 2
Direction is the direction that First air enters.
As shown in figure 3, nozzle 3 divides for part 32 under part 31, nozzle on nozzle in the utility model, wherein on nozzle
Part 31 uses wear-resisting alloy material；Part 32 uses high-performance cast steel material under nozzle.Nozzle 3 uses bi-material layers composite casting
It makes, i.e., part 31 is the anti-wear component of alloy on first casting nozzle, then the casting and mold are cooperated casting nozzle lower part
Dividing 32 is high-performance cast steel part；Nozzle using between bi-material layers composite casting two parts by the deposition of material, thermal deformation, fall
The processing methods such as dovetail groove 14, pin hole make on nozzle part 31 connect fastening, firm with part 32 under nozzle.
The height ratio of 31 anti-wear component of part and 32 high-performance cast steel part of part under nozzle on nozzle, generally uses 2:
5, adjusting range is between 1:3~1:2, to guarantee the performance of combining nozzle 3.
For the reliability for guaranteeing 31 anti-wear component of part on nozzle, the thickness of anti-wear component weakest link generally must not be low
In 7mm, usual thickness range of choice is 7mm~25mm.
Two kinds of material interfaces of nozzle 3 pour in separately the depth of dovetail groove 14 between 5mm~10mm, and trapezoidal hypotenuse angle is
Between 1 °~5 °.
The straight pin and pin hole diameter of 3 two kinds of material interfaces of nozzle point are within the scope of 5mm~15mm.
The utility model can both guarantee that nozzle 3 was operated with grinding machine 5 by the control in vertical gap 6 and horizontal clearance 7
Shi Buhui and stationary ring sealing have any friction, and can make leaking out to be reduced to and ignoring for dynamic and static gaps.Simultaneously as gear
The material that ring 12 and the nozzle upper half 31 equally use wearability high, is effectively protected vertical gap 6 and the water of dynamic and static ring
Flat gap 7 not will receive washing away repeatedly for coal dust and other sundries, improves the sealing effect of dynamic and static czermak space, reaches maintenance
Pulverizer capacity saves coal pulverizer electricity consumption and the purpose with wind.
Claims (9)
1. a kind of intermediate-speed coal mill rotating nozzle structure, including coal pulverizer combining nozzle and sealing structure two parts, feature exist
In: horizontal and vertical gap is formed simultaneously between the top and outside, with nozzle that sealing structure is located at nozzle；Air flue is located at nozzle
Inside, nozzle are segmental structure, and every section of nozzle uses composite casting structure.
2. intermediate-speed coal mill rotating nozzle structure according to claim 1, it is characterised in that: on the inside of the coal pulverizer
Stationary ring is equipped at barrel；On the outside of stationary ring, stationary ring and the sealing of coal-grinding barrel wall are comprehensive using pressing plate, round steel, packing and sealing tooth
Close sealing means；Pressing plate successively pushes down round steel and asbestos packing from top to bottom；Packing is pressed on sealing tooth.
3. a kind of intermediate-speed coal mill rotating nozzle structure, it includes: to be equipped with stationary ring at barrel on the inside of the coal pulverizer；It is ground in coal pulverizer
Disk is equipped with nozzle；Air flue is equipped in nozzle, it is characterised in that: is equipped with sealing structure in the upper outer of nozzle, and is being sealed
Vertical gap and horizontal clearance are formed simultaneously between structure and nozzle；Sealing structure includes pressing plate, round steel, asbestos packing, stationary ring
Seal tooth, baffle ring, asbestos washer；Wherein, in stationary ring side, it is close that pressing plate, round steel, asbestos packing, stationary ring are from top to bottom successively arranged
Seal tooth；Asbestos packing lower part is pressed on stationary ring sealing tooth；Pressing plate lower plane is equipped with plane on stationary ring；And it is set on stationary ring
There is baffle ring；High temperature asbestos washer is equipped between stationary ring and baffle ring.
4. the intermediate-speed coal mill rotating nozzle structure according to Claims 2 or 3, it is characterised in that: in the stationary ring and spray
The interstice coverage in the vertical gap that mouth top is formed are as follows: 5~15mm；In the horizontal clearance that baffle ring and nozzle top are formed simultaneously
Interstice coverage is 5~15mm.
5. according to claim 1 or the 3 intermediate-speed coal mill rotating nozzle structures, it is characterised in that: the nozzle is divided into spray
Part under part, nozzle on mouth, wherein wear-resisting alloy material is partially used on nozzle；It is partially cast using high-performance under nozzle
Steel material.
6. intermediate-speed coal mill rotating nozzle structure according to claim 5, it is characterised in that: part is wear-resisting on the nozzle
The height ratio adjusting range of part high-performance cast steel part is between 1:3~1:2 under part and nozzle.
7. intermediate-speed coal mill rotating nozzle structure according to claim 5, it is characterised in that: part is wear-resisting on the nozzle
Partial thickness range of choice is 7mm~25mm.
8. according to claim 1 or the 3 intermediate-speed coal mill rotating nozzle structures, it is characterised in that: two kinds of the nozzle
Material interface pours in separately the depth of dovetail groove between 5mm~10mm, and trapezoidal hypotenuse angle is between 1 °~5 °.
9. according to claim 1 or the 3 intermediate-speed coal mill rotating nozzle structures, it is characterised in that: described two kinds of materials of nozzle
The straight pin and pin hole diameter for expecting bound fraction are within the scope of 5mm~15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820263285.1U CN208661398U (en) | 2018-02-23 | 2018-02-23 | A kind of intermediate-speed coal mill rotating nozzle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820263285.1U CN208661398U (en) | 2018-02-23 | 2018-02-23 | A kind of intermediate-speed coal mill rotating nozzle structure |
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| Publication Number | Publication Date |
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| CN208661398U true CN208661398U (en) | 2019-03-29 |
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| CN201820263285.1U Active CN208661398U (en) | 2018-02-23 | 2018-02-23 | A kind of intermediate-speed coal mill rotating nozzle structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578466A (en) * | 2021-07-09 | 2021-11-02 | 湖北秦鸿新材料股份有限公司 | Dynamic and static ring structure of coal mill |
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2018
- 2018-02-23 CN CN201820263285.1U patent/CN208661398U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578466A (en) * | 2021-07-09 | 2021-11-02 | 湖北秦鸿新材料股份有限公司 | Dynamic and static ring structure of coal mill |
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