CN208526804U - A kind of pulverized coal preparation system flow field mentions effect device - Google Patents
A kind of pulverized coal preparation system flow field mentions effect device Download PDFInfo
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- CN208526804U CN208526804U CN201820531471.9U CN201820531471U CN208526804U CN 208526804 U CN208526804 U CN 208526804U CN 201820531471 U CN201820531471 U CN 201820531471U CN 208526804 U CN208526804 U CN 208526804U
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Abstract
A kind of pulverized coal preparation system flow field mentions effect device, the vane including mill and with multiple air flues, which is characterized in that vane passes through the screw arranged vertically and is connected and fixed with mill, and the air flue of vane is spliced by N sections of segmentation air flues, N >=3；It is additionally provided with multiple adjustment structures in air flue, the First air muzzle velocity of air flue is adjusted by adjustment structure.The utility model is able to solve the problem that pulverized coal preparation system is difficult to install, maintenance renewal cost is high, it is able to solve pulverized coal preparation system original design air flue to be easy the problem of falling in the later period, is able to solve the problem of pulverized coal preparation system Primary air flow control can not change real-time adjust automatically with load, coal amount.Safety, the reliability, maintainability, economy that pulverized coal preparation system can be improved, improve the degree of automation of pulverized coal preparation system.
Description
Technical field
The utility model relates to a kind of thermal power plant pulverized coal preparation system flow field institutional frameworks.
Background technique
Pulverized coal preparation system is one of coal-burning power plant's capital equipment.Domestic pulverized coal preparation system generallys use medium-speed vertical coal pulverizer.This
Coal pulverizer provides Pulverized Coal by functions such as milling, drying, screening and conveyings for boiler of power plant.Its main working process is summarized
As follows: raw coal is fallen on mill from the coal spout for being located at coal pulverizer center, and under the drive of the motor, mill is rotated original thereon
Coal is got rid of to milling on roller-way；Raw coal on roller-way is rolled broken, loading force by the grinding roller (usually three) being placed on mill
It is provided by spring or hydraulic device；Raw coal is thrown away from roller-way to vane side by milling at coal dust of different thickness, around mill
First air enter inside coal pulverizer from bottom to top, play the role of dry to coal dust and screen, thicker coal dust directly returns
Milling area, and pebble coal, the pyrite etc. that are difficult to crush and a wind is not got up enter an air compartment by First air air flue,
Continue to rise compared with fine breeze；First air will be sent compared with fine breeze to the separator on coal pulverizer top, in the separator, underproof thick
Coal dust is separated, and returns to milling region, and qualified fine breeze enters pulverized coal channel.Above is a complete mill
The coal period.
As seen from the above, First air plays the role of very important in pulverized coal preparation system work:
1, conveying acts on, and qualified coal dust is delivered into separator and coal pipe；
2, desiccation is dried and heated coal dust during pulverized coal conveying；
3, pebble coal, pyrite etc. are discharged into an air compartment, rough coal powder are blown into milling area and is re-grind by sieving actoion.
To organize First air, pulverized coal preparation system often uses vane (also referred to as nozzle, impeller etc.) on the outside of mill at present.Such as Fig. 1
It is shown.First air after vane 2, muzzle velocity increase, while obtaining circumferential and tangential component velocity to play conveying
With the effect of dry coal dust.Presently, there are following problems for this First air organization system:
Primary air flow can not with load, coal variation and change, adjusting can not be automated according to actual needs.Country's system
Powder system operating condition is complicated and changeable, and coal type change, load variations cause pulverized coal preparation system to be more big changes the needs of primary air flow,
And it is immutable to be limited to current vane discharge area, if First air reduces too much, First air will be caused to lift energy to coal dust
Power decline declines the screening capacity of pebble coal, more coal is caused to fall into an air compartment.Based on the above reasons, when actual motion
Primary air flow variation range is smaller, increases the power consumption of primary air fan, is also unfavorable for realizing low oxygen combustion in boiler.
As shown in Figure 1, vane 2 and the connection type of coal pulverizer mill 5 be not scientific.Vane 3 and coal pulverizer used at present
Mill 5 is horizontal connection, and connection bolt head 4 is exactly in First air exit.After the tissue of vane 3, First air is going out
Speed at mouthful increases, meanwhile, pebble coal, pyrite in raw coal etc. also can enter an air compartment by this channel.Above two
A condition leads to serious wear herein.It brings great inconvenience or even many coal pulverizers to maintenance and replacement and will appear because of spiral shell
Bolt serious wear and the accident for causing vane to fall.
Integrally-built vane is unfavorable for installation, replacement, while replaceability is poor, increases maintenance expense.Routine techniques at present
Vane structure be domain form or two hemisphere formats, when vane is installed, need by interfere inside coal pulverizer installation other
Mountable, the larger workload of, needs working hour longer after component such as grinding roller removes.The abrasion of vane is sometimes and uneven,
Locally have larger abrasion when, or be hit local damage when, since vane is overall structure, it is necessary to carry out whole vanes
Replacement causes the replacement of pulverized coal preparation system to overhaul expense and increases.
The throttling form of vane increases the drag losses inside coal pulverizer.Since domestic power plant's coal is complicated, operating condition is multiple
Miscellaneous, when pulverizer' s primary air flow and design when leading to actual motion, is different, it is often necessary to carry out throttling transformation to vane.Mesh
The restrictor ring 1 of preceding common structure as indicated with 1.Although restrictor ring can improve First air in vane exit velocity to a certain degree,
Increase First air and take powder ability and pebble coal screening capacity, but because restrictor ring thus can be such that First air occurs compared with maelstrom, it can be greatly
The big resistance for increasing First air inside coal pulverizer, and then increase primary air fan power consumption, station service power consumption rate increases.
Summary of the invention
The purpose of this utility model is so that First air adjacent components are suitable for burning coal variation, load variations, not
Influence First air lift ability and pebble coal sieving capacity in the case where, increase First air adjusting range and adjustment it is flexible
Property；More scientific connection type is used simultaneously, provides sufficient guarantee for the safety and reliability of First air organization system；It adopts
With more reasonable segmental structure, the maintainability of First air organization system is improved, is convenient for local replacing, reduces maintenance expense, is reduced
Installation difficulty.
In order to achieve the above object, there is provided a kind of pulverized coal preparation system flow fields to mention effect dress for the technical solution of the utility model
It sets, the vane including mill and with multiple air flues, which is characterized in that vane passes through the screw arranged vertically and connect with mill admittedly
Fixed, the air flue of vane is spliced by N sections of segmentation air flues, N >=3；It is additionally provided with multiple adjustment structures in air flue, is tied by adjusting
Structure adjusts the First air muzzle velocity of air flue.
Preferably, the number of the segmentation air flue is the approximate number of the air flue number.
Preferably, the top of the vane has extended to form extension in the horizontal direction, the screw penetrate extension and
After the mill, the vane and the mill are connected and fixed, the head of the screw is sunk in extension, in the screw
The top on head is equipped with cover board, and the head of the screw is enclosed in extension by cover board.
Preferably, the adjustment structure includes blade and the rotary shaft set on middle part of blade, blade around rotary shaft 30 °~
Rotation in 60 ° of angular range.
The advantage of the utility model is: being able to solve the problem that pulverized coal preparation system is difficult to install, maintenance renewal cost is high, energy
Enough solve the problems, such as that pulverized coal preparation system original design air flue is easy to fall in the later period, being able to solve pulverized coal preparation system Primary air flow control can not
The problem of changing real-time adjust automatically with load, coal amount.Safety, the reliability, maintainability, economy of pulverized coal preparation system can be improved
Property, improve the degree of automation of pulverized coal preparation system.
Detailed description of the invention
Fig. 1 is the pulverized coal preparation system vane form schematic diagram of the prior art；
Fig. 2 is that the utility model is segmented air flue schematic diagram；
Fig. 3 is the utility model air flue and mill attachment structure schematic diagram；
Fig. 4 (a) to Fig. 4 (c) is the utility model adjustment structure operation schematic diagram.
Drawing reference numeral explanation:
Restrictor ring 1；Air flue 2；Vane 3；Fixing screws 4；Mill 5；Blade 6；Shaft 7；Cover board 8.
Specific embodiment
To be clearer and more comprehensible the utility model, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
As shown in Fig. 2, mentioning effect device for pulverized coal preparation system flow field provided by the utility model.Original design designs air flue 2
It is spliced design for whole circle or by two half-turns.The air flue 2 of the utility model can be according to actual installation difficulty or ease and abrasion condition
It is divided into several segments segmentation air flue, the number for being segmented air flue is the approximate number of air flue number, is generally divided into 8~20 sections.Two neighboring point
It can be bolted or weld between section air flue, the difficulty of installation is reduced in the case where not influencing overall stiffness.Meanwhile point
Section air flue can be individually replaced, and substantially reduced the expense of subsequent replacement components, shortened the repair time, mitigate maintenance workload.
In conjunction with Fig. 3, air flue 2 and mill 5 are connected firmly by the utility model by convenient and reliable connection structure, Bu Huiyin
The failure of the reasons such as coal-grinding machine vibration, rotates integrally air flue 2 with mill 5, and First air is organized to enter inside coal pulverizer
Flow field.The design of connection structure by original horizontal connection mode as shown in Figure 1 be changed to it is as shown in Figure 3 connect mode vertically, i.e.,
Bolt 4 is arranged vertically.The top of vane 3 has extended to form extension in the horizontal direction, and screw 4 penetrates extension and described vertically
After mill 5, vane 3 and mill 5 are connected and fixed.The head of screw 4 is sunk in extension, is equipped in the top on 4 head of screw
The head of screw 4 is enclosed in extension by cover board 8 by cover board 8.Screw 4 is protected with cover board 8, can be mitigated First air and be taken
Abrasion of the powder to connecting portion ensures that vane installation is safe and reliable.
In conjunction with Fig. 2, Fig. 4 (a) to Fig. 4 (c), adjustment structure is also added in the utility model.Adjustment structure is in blade 6
Portion is equipped with rotary shaft 7, and 6 angle of blade, 6 angle change model of blade can be adjusted according to the variation of pulverized coal preparation system coal, load etc.
Enclosing is 30 °~60 °, by adjusting 6 angle of blade and then controls First air muzzle velocity, increases the adjustable range and tune of First air
Flexibility is saved, primary air fan power consumption is reduced.Fig. 4 (a) to Fig. 4 (c) is that 6 axial angle of blade is respectively 45 °, 30 ° and 60 ° three kinds
The signal of adjustment state.
The above are the most preferred embodiments of the utility model, are not intended to limit the utility model, all in the utility model
Within spirit and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the utility model.
Claims (4)
1. a kind of pulverized coal preparation system flow field mentions effect device, including mill (5) and with the vane (3) of multiple air flues (2), feature exists
In vane (3) passes through the screw (4) arranged vertically and is connected and fixed with mill (5), and the air flue (2) of vane (3) is by N sections of segmentation gas
Road is spliced, N >=3；Multiple adjustment structures are additionally provided in air flue (2), the primary of air flue (2) is adjusted by adjustment structure
Wind muzzle velocity.
2. a kind of pulverized coal preparation system flow field as described in claim 1 mentions effect device, which is characterized in that the number of the segmentation air flue
For the approximate number of the air flue (2) number.
3. a kind of pulverized coal preparation system flow field as described in claim 1 mentions effect device, which is characterized in that the top of the vane (3)
Extension has been extended to form in the horizontal direction, after the screw (4) penetrates extension and the mill (5), by the vane (3)
It is connected and fixed with the mill (5), the head of the screw (4) is sunk in extension, is set above the screw (4) head
There are cover board (8), the head of the screw (4) is enclosed in extension by cover board (8).
4. a kind of pulverized coal preparation system flow field as described in claim 1 mentions effect device, which is characterized in that the adjustment structure includes leaf
Piece (6) and the rotary shaft (7) being set in the middle part of blade (6), angular range inward turning of the blade (6) around rotary shaft (7) at 30 °~60 °
Turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820531471.9U CN208526804U (en) | 2018-04-13 | 2018-04-13 | A kind of pulverized coal preparation system flow field mentions effect device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820531471.9U CN208526804U (en) | 2018-04-13 | 2018-04-13 | A kind of pulverized coal preparation system flow field mentions effect device |
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| CN208526804U true CN208526804U (en) | 2019-02-22 |
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| CN201820531471.9U Active CN208526804U (en) | 2018-04-13 | 2018-04-13 | A kind of pulverized coal preparation system flow field mentions effect device |
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Cited By (1)
| 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 |
-
2018
- 2018-04-13 CN CN201820531471.9U patent/CN208526804U/en active Active
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 |
| 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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