CN108644803A - A kind of wind powder real-time leveling device and leveling method - Google Patents
A kind of wind powder real-time leveling device and leveling method Download PDFInfo
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- CN108644803A CN108644803A CN201810603142.5A CN201810603142A CN108644803A CN 108644803 A CN108644803 A CN 108644803A CN 201810603142 A CN201810603142 A CN 201810603142A CN 108644803 A CN108644803 A CN 108644803A
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- 239000000843 powder Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 107
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims 1
- 239000002817 coal dust Substances 0.000 abstract description 18
- 239000012530 fluid Substances 0.000 description 14
- 230000005484 gravity Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- -1 flow Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/02—Solid fuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of wind powder real-time leveling device and leveling methods, including：Separator for coal mill, boiler and multiple pulverized coal channels, separator for coal mill and boiler are connected by multiple pulverized coal channels；Multiple pulverized coal channels are inverted u-shaped, including two vertical sections and horizontal segment, and each pulverized coal channel is mounted on pressure tap in the vertical section of separator for coal mill one end, and the position height of pressure tap installation is identical；It is respectively connected with pressure difference transmitter between per adjacent pressure tap；Dragulator is mounted on horizontal segment；Further include control module, control module is electrically connected with pressure difference transmitter and dragulator.Wind powder real-time leveling device provided by the invention, can adjust coal pulverizer between boiler in pulverized coal channel coal dust and wind flow, reduce the deviation of the coal dust amount and wind that convey in each pulverized coal channel, form closed loop, it is automatic to carry out wind powder control, improve the combustibility of boiler.
Description
Technical field
The present invention relates to coal-fired power plant's technical field of boiler combustion, more particularly to a kind of wind powder real-time leveling
Device and leveling method.
Background technology
Coal-fired power plant mostly uses positive pressure direct blowing powder system at present, since the coal dust that coal pulverizer is ground directly is blown into pot
Stove burns, in order to ensure the stability and burn rate of boiler combustion, it is desirable that the concentration of every pulverized coal channel coal dust, flow, coal
The fineness of powder is kept in balance as possible.It is uniform that concentration of the coal dust in separator for coal mill is opposite, but from coal pulverizer to pot
Nearly 100 meters of the coal pipe Taoist priest of stove, short also has 20-30 meters.Length difference between pipeline is quite big, in addition different pipes
The trend in road also has prodigious difference, causes the friction loss of pipeline and local resistance loss difference very big, drag overall is small
Pipeline in primary air velocity it is high, the coal dust amount of carrying is also big, and primary air velocity is low in the big pipeline of drag overall, the coal dust amount of carrying
It is few, cause wind powder in pulverized coal channel uneven.
Wind powder, the i.e. mixture of coal dust and pumped (conveying) medium wind；Wind powder is non-uniform main reason is that in pulverized coal channel
Drag losses are uneven, and current wind powder mode has following two：
1, cold conditions leveling method：In the case of no coal dust, the resistance in pipeline is adjusted using shrinkage cavity regulating valve, passes through survey
Wind speed judges whether air quantity balances in buret road, usually adjusts air quantity to deviation and is less than in 5% range；
2, the hot adjusting method of balanced valve：The balanced valve that aperture is adjusted is installed in pulverized coal channel, while measurement being installed
The inductor of coal powder density and flow velocity compares the data of the different pulverized coal channels measured, flat as adjusting according to the result of the comparison
The foundation for the valve opening that weighs, wind powder is carried out by closed-loop control.
Above coal dust leveling method has the following problems：
1., cold conditions when air quantity leveling, but it is hot when, air quantity and powder amount are all uneven；2., regulating measure fall behind, cannot
It is adjusted in real time, cannot be satisfied actual demand；3., the environment in measurement means and pipeline mismatches, can not be adjusting ambient
Correct foundation is provided；4., the poor reliability of measuring cell, easy to wear, short life.
Therefore, how to provide a kind of wind powder real-time leveling device and leveling method is those skilled in the art's urgent need to resolve
Problem.
Invention content
In view of this, the present invention provides a kind of wind powder real-time leveling device and leveling method, coal pulverizer can be adjusted to pot
Between stove in pulverized coal channel coal dust and pumped (conveying) medium flow, reduce the coal dust amount and pumped (conveying) medium conveyed in each pulverized coal channel
Deviation improves the combustibility of boiler.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of wind powder real-time leveling device, including：Separator for coal mill, boiler and multiple pulverized coal channels, the coal pulverizer
Separator is connected with the boiler by multiple pulverized coal channels；Multiple pulverized coal channels are inverted u-shaped, including two vertical sections
And horizontal segment, each pulverized coal channel are mounted on pressure measurement in the vertical section of described separator for coal mill one end
Point, and the position height of multiple pressure tap installations is identical, and it is respectively connected with pressure difference pick-up between every adjacent pressure tap
Device；It is mounted on dragulator on the horizontal segment；Further include control module, the control module and the pressure difference transmitter
It is electrically connected with the dragulator.
Preferably, the position of multiple dragulator installations is identical.
Preferably, it is preset with the pressure difference for enabling to First air flow equalization in the pulverized coal channel in the control module
Setting value.
The invention also discloses a kind of wind powder real-time leveling methods, include the following steps：
S1, the aperture of dragulator is arranged the 80% of maximum opening；It presets in pulverized coal channel in the control module
The pressure differential resetting value of First air flow equalization；
S2, start separator for coal mill, the pressure difference at corresponding two neighboring pressure tap is measured using pressure difference transmitter；
S3, control module send out regulating command according to the pressure difference measured in step S2 to the dragulator,
Aperture is adjusted, until the pressure difference is less than the pressure differential resetting value.
Preferably, when the separator for coal mill load changes, wind powder flow rate and flow in the pulverized coal channel
Imbalance, when the pressure difference transmitter measured value exceeds the pressure differential resetting value, the control module is to the dragulator
Regulating command is sent out, until the wind powder in multiple pulverized coal channels reaches balance.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides a kind of wind powder to adjust in real time
Leveling device and leveling method, pressure tap vertical section of pulverized coal channel and in identical high position above separator for coal mill, make
Pressure difference between measuring adjacent pulverized coal channel with pressure difference transmitter, not only eliminates the systematic error of measurement, high certainty of measurement,
And pressure difference transmitter is not inserted into as measuring cell inside pulverized coal channel, will not generate interference to fluid in pulverized coal channel,
It will not cause the abrasion of measuring cell.
Meanwhile dragulator be mounted on pressure tap after horizontal segment pulverized coal channel on, before dragulator being reduced
Kinetic energy rejection afterwards improves the accuracy of resistance regulation；Moreover, control module carries out the pressure difference measured and pressure differential resetting value
Compare, when pressure difference is more than pressure differential resetting value, sends out regulating command to dragulator, pulverized coal channel internal resistance is adjusted
Section, until pressure difference is less than pressure differential resetting value, guarantee wind powder reaches dynamic equilibrium, realizes real-time control.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawings are the structural schematic diagram of wind powder real-time leveling device provided by the invention.
Fig. 2 attached drawings are the flow diagram of wind powder real-time leveling method provided by the invention.
Fig. 3 attached drawings are provided by the invention each with reference to cross section parameter schematic diagram.
Reference numeral is：1 is separator for coal mill, and 2 be pressure tap, and 3 be pressure transmitter, and 4 be pulverized coal channel, and 5 be resistance
Draught control mechanism, 6 be boiler, 7 modules in order to control.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
With reference to attached drawing 1, the embodiment of the invention discloses a kind of wind powder real-time leveling devices, above separator for coal mill 1
The vertical section of pulverized coal channel installs pressure tap 2, and the position height of pressure tap 2 is identical on multiple pulverized coal channels 4, ensures from coal pulverizer
The pressure loss that separator 1 arrives between pressure tap 2 is consistent, and pressure difference transmitter 3 is equipped between two neighboring pressure tap 2, is used for
Measure the pressure difference at 4 pressure tap 2 of two neighboring pulverized coal channel；It is mounted on dragulator on 4 horizontal segment of pulverized coal channel
5。
Fluid wind powder, the i.e. mixture of coal dust and pumped (conveying) medium wind will produce energy loss by dragulator, packet
Include the kinetic energy rejection caused by the kinetic energy rejection and vertical direction gravity in pulverized coal channel direction：When mounted on horizontal segment, coal pipe
Road diameter is smaller (generally 0.4m or so), and vertical direction loss caused by gravity is smaller, and fluid is in horizontal forward motion process
In, it is smaller by kinetic energy rejection before and after dragulator, the movement velocity of fluid is influenced little；When mounted on vertical section, stream
During body rises in the vertical direction, since the pulverized coal channel of vertical direction is longer (generally all in 3m or more), caused by gravity
Energy loss is very big, larger by the kinetic energy rejection before and after dragulator, is affected to the fluid rate of climb.Therefore, exist
Dragulator is installed on horizontal segment, the kinetic energy rejection of fluid can be reduced so that resistance regulation is more accurate.
With reference to attached drawing 2, the invention also discloses a kind of wind powder real-time leveling methods, include the following steps：
S1, the aperture of dragulator 5 is arranged the 80% of maximum opening；Pulverized coal channel 4 is preset in control module 7
The pressure differential resetting value of interior First air flow equalization；
S2, start separator for coal mill 1, the pressure at corresponding two neighboring pressure tap 2 is measured by pressure difference transmitter 3
Difference；
S3, control module 7 send out regulating command according to the pressure difference measured in step S2 to dragulator, and adjusting is opened
Degree, until pressure difference is less than pressure differential resetting value.
Moreover, when 1 load of separator for coal mill changes, wind powder flow rate and flow are uneven in pulverized coal channel 4, pressure
When 3 measured value of poor transmitter exceeds pressure differential resetting value, control module 7 sends out regulating command to dragulator 5, until multiple coals
Wind powder in powder pipeline 4 reaches balance.
The flow equation being applied in the present invention derives as follows：
First, for the ease of the derivation of equation and calculating, under the premise of not influencing result of calculation, following 2 points of hypothesis are done：
1, ignore influence of the coal dust to First air, wind powder mixture is considered as to single viscous fluid；
Coal dust real density is about 1000kg/m3, wind coal quality ratio is 2 in pulverized coal channel 4：1 or so, it is mixed that wind powder is calculated accordingly
It closes in object, volume 0.05% shared by coal dust, since shared volume ratio is very small, so ignoring the influence of coal dust.
2, wind powder mixture is incompressible fluid；
Air is compressible gas, but relative to the primary air pressure changing value in separator for coal mill 1 at pressure tap 2
Only 300~400pa, only the 0.3%~0.4% of First air absolute pressure, so ignoring volume change, it is believed that wind powder mixes
Object is incompressible fluid.
Referring to Fig. 3, the present embodiment is provided with two pulverized coal channels 4, pulverized coal channel A and pulverized coal channel B, correspondingly, in coal
Pulverized coal channel A dragulators 5 and pulverized coal channel B dragulators 5 are respectively arranged on the horizontal segment of powder pipeline A；By coal-grinding
The contact surface of machine separator 1 and pulverized coal channel 4 is set as referring to section 0, sets the plane residing for pressure tap 2 to refer to section
1, the contact surface of pulverized coal channel 4 and boiler 6 is set to refer to section 2；
Wherein,
Each pa-rameter symbols meaning is：
Z is potential energy, and V is fluid flow rate, and P is with reference to quiet strong at section, and △ P are transversal to separator for coal mill with reference to section
The drag losses in face, ρ are fluid density, and g is acceleration of gravity；
Subfix meaning：
A is pulverized coal channel A, and B is pulverized coal channel B, and M is separator for coal mill section, and 0 is 0 section, and 1 is 1 section；
Pa-rameter symbols and subfix combination application, such as PA0To refer to the static pressure at section 0, Z in pulverized coal channel AmFor
Potential energy at separator for coal mill, PMFor the quiet strong of separator for coal mill section, VmFor fluid stream at separator for coal mill section
Speed, VAFor fluid flow rate in pulverized coal channel A, Δ PA0To refer to the resistance for arriving separator for coal mill section in section 0 in pulverized coal channel A
Loss, Δ PA1To refer to the drag losses for arriving separator for coal mill section in section 1 in pulverized coal channel A；Similarly, when subscript is B
Then represent corresponding value in pulverized coal channel B.
There is following equation to set up pulverized coal channel A and B according to viscous fluid Bernoulli equation：
Pulverized coal channel symmetrically arranges that the size of pulverized coal channel is identical on separator, so the resistance at section 0
Lose △ PA0=△ PB0, similarly due between section 0 and section 1 line size and arrangement it is identical, the resistance at section 1
Power loses △ PA1=△ PB1.So can be obtained by formula 1 and formula 2
As long as from formula 3 as can be seen that with reference to the static pressure P from section 1A1=PB1, that is, prove pulverized coal channel A and coal pipe
Flow velocity V in road BA=VB；Again because the latus rectum of pulverized coal channel 4 is identical, a wind flow is equal in each pulverized coal channel 4；Mill
Coal powder density is uniform in coal machine separator 1, so the amount of the coal dust entered in pulverized coal channel 4 at this time is also uniform.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (5)
1. a kind of wind powder real-time leveling device, which is characterized in that including：Separator for coal mill (1), boiler (6) and multiple coal dusts
Pipeline (4), the separator for coal mill (1) and the boiler (6) are connected by multiple pulverized coal channels (4)；
Multiple pulverized coal channels (4) are inverted u-shaped, including：Two vertical sections and horizontal segment, each pulverized coal channel (4)
It is mounted on pressure tap (2), and multiple pressure taps in the vertical section of the separator for coal mill (1) one end
(4) installation site height is identical；It is respectively connected with pressure difference transmitter (3) between per the adjacent pressure tap (2)；On the horizontal segment
It is mounted on dragulator (5)；
Further include control module (7), the control module (7) and the pressure difference transmitter (3) and the dragulator (5) electricity
Connection.
2. a kind of wind powder real-time leveling device according to claim 1, which is characterized in that multiple dragulators
(5) position installed is identical.
3. a kind of wind powder real-time leveling device according to claim 1, which is characterized in that pre- in the control module (7)
Equipped with the pressure differential resetting value for enabling to the interior First air flow equalization of the pulverized coal channel (4).
4. a kind of wind powder real-time leveling method, which is characterized in that utilize claim 1-3 any one of them wind powder real-time levelings
Device includes the following steps：
S1, the aperture of dragulator (5) is arranged the 80% of maximum opening；Pulverized coal channel is preset in control module (7)
(4) the pressure differential resetting value of interior First air flow equalization；
S2, start separator for coal mill (1), the pressure at corresponding two neighboring pressure tap (2) is measured using pressure difference transmitter (3)
Difference；
S3, control module (7) send out adjusting to the dragulator (5) according to the pressure difference measured in step S2 and refer to
It enables, adjusts aperture, until the pressure difference is less than the pressure differential resetting value.
5. a kind of wind powder real-time leveling method according to claim 4, which is characterized in that when the separator for coal mill
(1) when load changes, the interior wind powder flow rate of the pulverized coal channel (4) and flow are uneven, and the pressure difference transmitter (3) measures
When value is beyond the pressure differential resetting value, the control module (7) sends out regulating command to the dragulator (5), until more
Wind powder in a pulverized coal channel (4) reaches balance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810603142.5A CN108644803B (en) | 2018-06-12 | 2018-06-12 | Real-time leveling device and method for wind powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810603142.5A CN108644803B (en) | 2018-06-12 | 2018-06-12 | Real-time leveling device and method for wind powder |
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| CN108644803B CN108644803B (en) | 2023-09-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399217A (en) * | 2018-12-06 | 2019-03-01 | 上海意丰机电科技开发有限公司 | A kind of pulverized coal channel drag regulator |
| CN113686723A (en) * | 2021-08-24 | 2021-11-23 | 西安热工研究院有限公司 | Abrasion weight-reducing type pulverized coal pipeline air-powder deviation measuring device and method |
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| CN113686723A (en) * | 2021-08-24 | 2021-11-23 | 西安热工研究院有限公司 | Abrasion weight-reducing type pulverized coal pipeline air-powder deviation measuring device and method |
| CN113686723B (en) * | 2021-08-24 | 2023-08-15 | 西安热工研究院有限公司 | Wear weight-reduction type pulverized coal pipeline wind-powder deviation measuring device and method |
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| Publication number | Publication date |
|---|---|
| CN108644803B (en) | 2023-09-12 |
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Denomination of invention: A real-time leveling device and leveling method for wind powder Granted publication date: 20230912 Pledgee: Minhang Branch of Shanghai Rural Commercial Bank Co.,Ltd. Pledgor: SHANGHAI YIFENG ELECTRICAL AND MECHANICAL TECHNOLOGY DEVELOPMENT CO.,LTD. Registration number: Y2024310000396 |