CN104096630B - A kind of bottom of medium-speed mill structure - Google Patents
A kind of bottom of medium-speed mill structure Download PDFInfo
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- CN104096630B CN104096630B CN201310119371.7A CN201310119371A CN104096630B CN 104096630 B CN104096630 B CN 104096630B CN 201310119371 A CN201310119371 A CN 201310119371A CN 104096630 B CN104096630 B CN 104096630B
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- 230000001154 acute effect Effects 0.000 claims description 5
- 239000003245 coal Substances 0.000 abstract description 42
- 239000004575 stone Substances 0.000 abstract description 7
- 230000009466 transformation Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a kind of bottom of medium-speed mill structure, cylindrical shape in hollow, the inner chamber of bottom of medium-speed mill is formed as bottom plenum, it is arranged over vane at bottom plenum, a side wall of bottom plenum offers circular arc air inlet, air inlet is circumscribed with the air intake frid with air inlet duct, inside bottom plenum, the circumference along bottom plenum is equipped with two pieces of fan-shaped flow aprons separately, two pieces of fan-shaped flow aprons are arranged on the same concentric circles with described bottom plenum center as the center of circle, and two pieces of fan-shaped flow aprons are respectively adjacent to the position that engages in the two side ends of described air intake frid with described air inlet.Two pieces of fan-shaped flow aprons are symmetric relative to the middle bisector of air inlet.Present invention optimizes the distribution situation of coal pulverizer flow field, alleviate or even eliminate the phenomenon of the Flow Field Distribution inequality that side air intake brings, it is achieved that stone coal discharge is reasonable, ensure that pulverizer capacity is normal.
Description
Technical field
The present invention relates to a kind of medium-speed pulverizer, particularly relate to a kind of bottom of medium-speed mill structure.
Background technology
Along with thermal power plant scale in recent years is increasing and the gradually stepping up of awareness of saving energy, in China's active service and newly-built
In more than 300MW unit, be increasingly being equipped with pressurized direct pulverizing coal system, its have startup rapidly, flexible adjustment,
Resistance is little, unit coal-grinding metal wear is little, compact conformation, floor space are little, unit power consumption is low, explosion hazard is little and noise
The advantage such as low.
But due to the inadequate natural endowment in structure design itself and the actual polytropy using coal of power plant at present, domestic actual throwing
The medium-speed pulverizer of fortune generally also exists undercapacity, stone coal discharge exception, grinding roller and grinding disk Fast Wearing, vane jam, mill
In the strenuous vibration of coal machine, tube cell pulverized coal fineness difference etc. problems, these leverage the safety of coal pulverizer or even unit
Property and economy.Wherein the problem of stone coal discharge is exactly the FAQs that a Ge Ling power plant is thorny, if the pebble coal mistake discharged
How the pulverized coal particle carried secretly in pebble coal will be caused too much so that pulverizer capacity reduces, economy is deteriorated；And if discharge
Pebble coal amount crosses that major general's load that makes to mill is excessive, and in coal, ash content increases affects coal dust firing, more seriously causes bigger abrasion,
Cause the abnormal vibrations of coal pulverizer, hidden danger can be brought to safe operation.
In today that power industry economizer pressure is increasing, the transformation of coal pulverizer and optimization have had become as what many power plant paid close attention to
One importance.Previous research and field experience show, as shown in Figure 1, 2, and the one of existing medium-speed pulverizer employing
Secondary wind is blown into the structure of bottom plenum from side, and the internal Flow Field Distribution such as an air compartment bottom it can be caused chaotic, and this is to cause
There is a major reason of problems in coal pulverizer.Although the most domestic transformation to medium-speed pulverizer has some to attempt, currently
In engineering, the transformation to medium-speed pulverizer concentrates on the transformation to vane substantially, including fixed vane is changed into rotary type vane,
Occluding member vane etc..Especially huge to stone coal discharge amount medium-speed pulverizer, for improving the primary air velocity at vane to subtract
The discharge of few pebble coal, engineering usually uses the method blocking part vane.But this kind of method can only be dependent on power plant's technology
The operating experience of personnel or coal pulverizer design the design experiences of producer and carry out, as which vane blade of bottom seal not
Accurate quantitative basis, therefore often transformation result is unsatisfactory.Even if the vane blade that bigger problem occurs just of closure, also
Being not enough to inside medium-speed pulverizer obtain the distribution of preferable uniform flow field, the effect of this transformation is very limited.And in closure
Due to the reduction of circulation area at vane after part vane, the overall pressure drop of medium-speed pulverizer can steeply rise, and will cause energy consumption
It is significantly increased, and the significant problems such as pulverizer capacity is not enough, unit Changing load-acceleration is not enough may be caused.Therefore at present to existing
The transformation of technology, is first only based on empirical analysis qualitatively and does not has quantitative data support, secondly the effect of this transformation
Itself is the most inconspicuous, so that this type of coal pulverizer is chronically at a kind of irrational running status, brings economy the safest
The problems such as property.
Therefore, how to find a kind of reasonably medium-speed pulverizer structure, for instruct coal pulverizer transformation, ensure pulverized coal preparation system or even
Safe and reliable and the economical operation of whole boiler controller system is all of great practical significance.
Summary of the invention
It is an object of the invention to provide a kind of distribution situation that can optimize coal pulverizer flow field, alleviate or even eliminate side air intake band
The phenomenon that the Flow Field Distribution come is uneven, it is achieved stone coal discharge is reasonable, ensure pulverizer capacity normal bottom of medium-speed mill knot
Structure.
For reaching above-mentioned purpose, the present invention proposes a kind of bottom of medium-speed mill structure, and described bottom of medium-speed mill is hollow
Cylindrical shape, the inner chamber of described bottom of medium-speed mill is formed as bottom plenum, is arranged over vane at described bottom plenum, in institute
Stating and offer circular arc air inlet in a side wall of bottom plenum, described air inlet is circumscribed with the air intake frid with air inlet duct,
Inside described bottom plenum, the circumference along described bottom plenum is equipped with two pieces of fan-shaped flow aprons separately, described two pieces of fans
Shape flow apron is arranged on the same concentric circles with described bottom plenum center as the center of circle, and described two pieces of fan-shaped flow aprons divide
It is not adjacent to the position that the two side ends of described air intake frid engages with described air inlet.
Bottom of medium-speed mill structure as above, wherein, described two pieces of fan-shaped flow aprons are relative in described air inlet
Between bisector be symmetric.
Bottom of medium-speed mill structure as above, wherein, the radian of described fan-shaped flow apron is 60 °.
Bottom of medium-speed mill structure as above, wherein, the height of described fan-shaped flow apron and the height of described bottom plenum
Spend identical.
Bottom of medium-speed mill structure as above, wherein, the radian of described two pieces of fan-shaped flow aprons is respectively 60 ° and 75
°。
Bottom of medium-speed mill structure as above, wherein, between described two pieces of fan-shaped flow aprons, the bisector at interval is to institute
Stating the acute angle between the middle bisector of air inlet is A ,-15 °≤A≤10 °.
Compared with prior art, the invention have the characteristics that and advantage:
1, the present invention can be effectively improved the Flow Field Distribution within medium-speed pulverizer so that the flow distribution of each vane keeps uniformly,
Can effectively realize more rationally discharging of pebble coal.
2, due to the fact that and improve the discharge function of pebble coal, it is thus ensured that medium-speed pulverizer keeps exerting oneself normally.
3, the present invention can promote the economic performance of medium-speed pulverizer.
4, the present invention is less to the change of existing medium-speed pulverizer, and construction cost and difficulty are little, and feasibility is strong.
5, the present invention is applied widely, the most applicable to all medium-speed pulverizers.
Accompanying drawing explanation
Accompanying drawing described here is only used for task of explanation, and is not intended to limit scope disclosed by the invention by any way.It addition,
The shape of each parts in figure and proportional sizes etc. are only schematically, are adapted to assist in the understanding of the present invention, are not concrete limit
Determine shape and the proportional sizes of each parts of the present invention.Those skilled in the art under the teachings of the present invention, can be according to concrete feelings
Condition selects various possible shapes and proportional sizes to implement the present invention.
Fig. 1 is the perspective view of existing medium-speed pulverizer；
Fig. 2 is the main TV structure schematic diagram of existing medium-speed pulverizer；
Fig. 3 is the perspective view of the embodiment one of bottom of medium-speed mill structure of the present invention；
Fig. 4 is the plan structure schematic diagram of the embodiment one of bottom of medium-speed mill structure of the present invention；
Fig. 5 is the plan structure schematic diagram of the embodiment two of bottom of medium-speed mill structure of the present invention；
Fig. 6 is the plan structure schematic diagram of the embodiment three of bottom of medium-speed mill structure of the present invention.
Description of reference numerals:
10-bottom of medium-speed mill；1-bottom plenum；2-air inlet；3-air intake frid；41,42-flow apron；
The position that the two side ends of a1, a2-air intake frid 3 engages with air inlet 2；
The middle bisector of LL '-air inlet 2；The bisector at interval between MM '-flow apron 41 and flow apron 42；
Acute angle between A-bisector MM ' and middle bisector LL '.
Detailed description of the invention
In conjunction with accompanying drawing and the description of the specific embodiment of the invention, it is possible to clearly understand the details of the present invention.But,
The detailed description of the invention of this present invention described, is only used for explaining the purpose of the present invention, and it is right for can not being understood as by any way
The restriction of the present invention.Under the teachings of the present invention, technical staff it is contemplated that the most possible deformation of based on the present invention, these
It is regarded as belonging to the scope of the present invention.
Refer to Fig. 3, Fig. 4, the perspective view of the embodiment one of bottom of medium-speed mill structure the most of the present invention and
Plan structure schematic diagram.As shown in Figure 3, Figure 4, the bottom of medium-speed mill structure that the present invention provides, at the bottom of this medium-speed pulverizer
The portion 10 cylindrical shape in hollow, the inner chamber of bottom of medium-speed mill 10 is formed as bottom plenum 1, sets above bottom plenum 1
Having vane (not shown), offer circular arc air inlet 2 in a side wall of bottom plenum 1, this air inlet 2 is external
There is the air intake frid 3 with air inlet duct.Make First air can enter to bottom plenum 1 through air inlet duct and air inlet 2, then lead to
Cross vane and enter dry place.In the present invention, it is equipped with separately in the internal circumference along bottom plenum 1 of bottom plenum 1
Two pieces of fan-shaped flow aprons 41,42, it is same that two pieces of fan-shaped flow aprons 41,42 are arranged at bottom plenum 1 center as the center of circle
On one concentric circles, and two pieces of fan-shaped flow aprons 41,42 are respectively adjacent to connect with air inlet 2 in the two side ends of air intake frid 3
The position closed, i.e. at a1 and a2 in Fig. 4.So, the present invention is by near the two side ends of air intake frid 3 and air inlet
2 positions engaged arrange two pieces of fan-shaped flow aprons 41,42, play water conservancy diversion and once enter wind action, thus effectively improve
Air velocity distribution distribution within coal pulverizer, it is achieved stone coal discharge is reasonable, it is ensured that pulverizer capacity is normal, improves coal pulverizer
Performance.
In the present embodiment, as shown in Figure 4, two pieces of fan-shaped flow aprons 41,42, relative to the middle bisector of air inlet 2
LL ' is symmetric, and further improves the air velocity distribution distribution within coal pulverizer.
Preferably, as shown in Figure 4, the radian of two pieces of fan-shaped flow aprons 41,42 is 60 °, to ensure preferably water conservancy diversion effect
Really.Certainly, the radian size of two pieces of fan-shaped flow aprons 41,42 selects also dependent on actual condition, as long as can reach
To the air velocity distribution distribution improved within coal pulverizer, promote effect of coal pulverizer performance.
Further, the height of two pieces of fan-shaped flow aprons 41,42 is identical with the height of bottom plenum 1, enough to guarantee
Water conservancy diversion area.
As another preferred embodiment of the present invention, refer to Fig. 5, for the enforcement of bottom of medium-speed mill structure of the present invention
The plan structure schematic diagram of example two.Parts identical with embodiment one in the present embodiment, use identical label.The present embodiment
Difference with embodiment one essentially consists in, and the radian of flow apron 41 is 75 °, and the radian of flow apron 42 is 60 °, leads
Acute angle between bisector MM at interval between stream baffle plate 41 and flow apron 42 ' to middle bisector LL of air inlet ' presss from both sides
Angle A is-15 ° (negative sign represents counterclockwise).
As yet another preferred embodiment of the present invention, refer to Fig. 6, for the enforcement of bottom of medium-speed mill structure of the present invention
The plan structure schematic diagram of example three.Parts identical with embodiment one in the present embodiment, use identical label.The present embodiment
In, the radian of flow apron 41 is 60 °, and the radian of flow apron 42 is also 60 °, and it mainly exists with the difference of embodiment one
In, bisector MM at interval between flow apron 41 and flow apron 42 ' to middle bisector LL of air inlet ' between
Acute angle A is for being rotated clockwise 10 °.
The present invention uses method for numerical simulation to be used for the simulation study of medium-speed pulverizer interior flow field, it is achieved to coal pulverizer interior flow field
With performance accurate, determine quantitative analysis.Finding through simulation, there are two obvious whirlpools in medium-speed pulverizer interior flow field
Whirlpool district, two whirlpool districts lay respectively at the position of First air inlet tube and air compartment left and right intersection of coal pulverizer, i.e. in Fig. 4 two pieces
Fan-shaped flow apron 41,42 is respectively adjacent at position a1 and a2 that the two side ends of air intake frid 3 engages with air inlet 2.
Its Crack cause be due to First air be blown into from the side of air compartment of coal pulverizer, First air is by the air-flow in air channel to air compartment
Sudden expansion process.
Also with method for numerical simulation, the medium-speed pulverizer after this improvement having been carried out interior flow field emulation, result shows single
The absolute relative error maximum of vane flow and average discharge only has about 10%, far below existing coal pulverizer 31.1%
Large deviation, this shows by the transformation on present configuration, and the flow field in medium-speed pulverizer achieves the most substantially uniformly to be divided
Cloth, has reached the initial purpose of research.It addition, compare the pressure drop that before and after polycrystalline substance improves, medium-speed pulverizer is overall, send out
The existing present invention merely add about 190Pa than the import and export pressure drop of existing coal pulverizer after improving, and such crushing amplification is in engineering
It it is acceptable.
From the foregoing, it will be observed that the present invention is keeping medium-speed pulverizer entrance structure, vane structure, coal pulverizer body upper part structure constant
Under premise, change by laying two pieces of fan-shaped flow aprons 41,42 in air inlet 2 bilateral symmetry and optimize bottom plenum 1
Structure, improves the distribution situation of Base Flow, alleviates or even eliminates the Flow Field Distribution inequality brought due to side air intake, thus real
The effects such as existing stone coal discharge is reasonable, pulverizer capacity is normal.
In sum, the method have the advantages that
1, the present invention can be effectively improved the Flow Field Distribution within medium-speed pulverizer so that the flow distribution of each vane keeps uniformly,
Can effectively realize more rationally discharging of pebble coal.
2, due to the fact that and improve the discharge function of pebble coal, it is thus ensured that medium-speed pulverizer keeps exerting oneself normally.
3, the present invention can promote the economic performance of medium-speed pulverizer.
4, the present invention is less to the change of existing medium-speed pulverizer, and construction cost and difficulty are little, and feasibility is strong.
5, the present invention is applied widely, the most applicable to all medium-speed pulverizers.
Explaining in detail for the respective embodiments described above, its purpose is only that and explains the present invention in order to be able to preferably
Understand the present invention, but, these describe can not be limitation of the present invention with any explanation one-tenth, particularly, different
Each feature described in embodiment can also mutually be combined, thus forms other embodiments, the most contrary except having
Description, these features should be understood can be applied in any one embodiment, and is not limited merely to described reality
Execute mode.
Claims (3)
1. a bottom of medium-speed mill structure, described bottom of medium-speed mill is the cylindrical shape of hollow, described medium-speed pulverizer
The inner chamber of bottom is formed as bottom plenum, is arranged over vane at described bottom plenum, in a side wall of described bottom plenum
Offering circular arc air inlet, described air inlet is circumscribed with the air intake frid with air inlet duct, it is characterised in that in described bottom
Inside air compartment, the circumference along described bottom plenum is equipped with two pieces of fan-shaped flow aprons separately, described two pieces of fan-shaped flow aprons
It is arranged on the same concentric circles with described bottom plenum center as the center of circle, and described two pieces of fan-shaped flow aprons are respectively adjacent in institute
State the position that the two side ends of air intake frid engages with described air inlet；Described two pieces of fan-shaped flow aprons are relative to described air inlet
Middle bisector be symmetric；The radian of described fan-shaped flow apron is 60 °.
2. bottom of medium-speed mill structure as claimed in claim 1, it is characterised in that the height of described fan-shaped flow apron
Identical with the height of described bottom plenum.
3. bottom of medium-speed mill structure as claimed in claim 1, it is characterised in that described two pieces of fan-shaped flow aprons it
Between interval bisector to described air inlet middle bisector between acute angle be A ,-15 °≤A≤10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310119371.7A CN104096630B (en) | 2013-04-08 | 2013-04-08 | A kind of bottom of medium-speed mill structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310119371.7A CN104096630B (en) | 2013-04-08 | 2013-04-08 | A kind of bottom of medium-speed mill structure |
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| CN104096630A CN104096630A (en) | 2014-10-15 |
| CN104096630B true CN104096630B (en) | 2016-08-24 |
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