CN108212348A - A kind of coal pulverizer impeller unit improved method based on CFD technologies - Google Patents
A kind of coal pulverizer impeller unit improved method based on CFD technologies Download PDFInfo
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- CN108212348A CN108212348A CN201711382709.2A CN201711382709A CN108212348A CN 108212348 A CN108212348 A CN 108212348A CN 201711382709 A CN201711382709 A CN 201711382709A CN 108212348 A CN108212348 A CN 108212348A
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- coal pulverizer
- guide plate
- impeller unit
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- impeller
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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
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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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
- 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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- Theoretical Computer Science (AREA)
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- Pure & Applied Mathematics (AREA)
- Mathematical Optimization (AREA)
- Mathematical Analysis (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Computational Mathematics (AREA)
- Food Science & Technology (AREA)
- Combined Means For Separation Of Solids (AREA)
- Crushing And Grinding (AREA)
Abstract
A kind of coal pulverizer impeller unit improved method based on CFD technologies, including：First step：Fluid domain geometrical model whole inside coal pulverizer is established, and carries out fluid grid division；Second step：It according to the coal pulverizer inlet boundary condition data that actual measurement obtains, is divided using the fluid domain geometrical model of foundation and the fluid grid, establishes computation model and carry out fluid emulation calculating；Third step：Change the setting angle of guide plate, guide plate quantity and wing plate width in impeller unit in impeller unit, and the data result under the various combination state of guide plate setting angle, guide plate quantity and wing plate width is extracted based on the computation model respectively；Four steps：According to the data result, changing rule of the impeller unit outlet performance indicator with guide plate setting angle, guide plate quantity and wing plate width is obtained；5th step：The guide plate setting angle, the guide plate quantity and the wing plate width are selected using changing rule.
Description
Technical field
The present invention relates to coal pulverizer impeller unit fields more particularly to one kind to be based on CFD (computational fluid
Dynamics, Fluid Mechanics Computation) technology coal pulverizer impeller unit improved method.
Background technology
Impeller unit is the centre position critical component that an air compartment and separator body are connected in HP coal pulverizers, with grinding bowl
It is connected, and is rotated with mill bowl, effect is will to blow over next hot wind from an air compartment and be distributed after impeller unit to become
Than more uniform, coal dust separation is carried out in the pulverized coal particle to separator for coal mill body after drive Chan mills.
Impeller unit is studied, the uniformity for improving impeller outlet speed and speed has the separating effect of coal dust
Great effect.The patent application CN203816750U of entitled " a kind of bowl pulverizer impeller unit " discloses a kind of bowl
Formula medium-speed pulverizer impeller unit is made of installing plate, outer panel and multiple partition boards, and partition board both ends are respectively arranged with concave curved surface,
It is in concave-concave curved to make partition board so that air-flow vortex will not be generated in the gas channel formed between partition board, improves impeller unit
Service life.In the patent application CN203737378U of entitled " the mill bowl impeller unit of coal pulverizer ", buffered by setting
Plate can make the pebble coal being thrown out of and coal slow down rapidly, be detached after shaping, the phenomenon that avoiding containing coal in pebble coal, so as to
Improve utilization rate of the power plant to coal.It can make by hot wind evenly, so as to improve the uniformity of coal dust, make coal dust firing
More fully, boiler combustion efficiency is improved, plays the role of saving energy, lowering energy consumption and reducing pollutants discharge, environmental protection.A kind of entitled " novel impeller dress
Put " patent application CN204034849U disclose a kind of novel impeller device suitable for HP type medium-speed pulverizers, pacified
On the mill bowl of coal pulverizer, including restrictor ring, adjustable plate, deflector, side plate, vane.Impeller unit is improved to pebble coal
The efficiency of separation so that coal pulverizer stone coal discharge amount is significantly reduced.Reduce operation in heat primary air to impeller unit
The erosive wear of side plate, solve restrictor ring in impeller unit operation it is easy to wear come off, problems, the drop such as side plate abrasion is very fast
Low motor power consumption.
But coal pulverizer impeller unit is typically all to cause technology and drawing using external, actual use at home
In, since actual condition and coal quality condition have larger difference with external, and usually there is no according to practical work for domestic enterprise
Condition improves the enough technical supports or knot of improved method shortage to carry out the further structure of impeller unit
Structure improvement is larger, causes to pay the defects of of high cost.
Invention content
In view of the drawbacks described above of the prior art, the technical problems to be solved by the invention are to provide a kind of based on CFD skills
The coal pulverizer impeller unit improved method of art can realize that the small structure to impeller unit is improved according to practical operating mode,
Obtain high efficiency simultaneously.
To achieve the above object, the present invention provides a kind of coal pulverizer impeller unit improved method based on CFD technologies, packets
It includes：First step：Fluid domain geometrical model whole inside coal pulverizer is established, and carries out fluid grid division；Second step：Root
The coal pulverizer inlet boundary condition data factually measured, utilizes the fluid domain geometrical model of foundation and the fluid grid
It divides, establishes computation model and carry out fluid emulation calculating；Third step：Change setting angle, the leaf of guide plate in impeller unit
Guide plate quantity and wing plate width in wheel apparatus, and based on the computation model extract respectively guide plate setting angle,
Data result under guide plate quantity and the various combination state of wing plate width；Four steps：According to the data result, obtain
Take changing rule of the impeller unit outlet performance indicator with guide plate setting angle, guide plate quantity and wing plate width；
5th step：The guide plate setting angle, the guide plate quantity and the wing plate width are selected using changing rule.
Preferably, fluid domain geometrical model whole inside coal pulverizer is established using SolidWorks softwares, and is used
ICEM tools carry out fluid grid division.
Preferably, in second step, the pressure value of multiple points in interior flow field is extracted, is relatively tested with actual test value
Demonstrate,prove computation model reasonability.
Preferably, the pressure value of extraction and the error of actual test value then judge computation model within predetermined threshold range
Rationally.
Preferably, computation model is established in fluent tools and carries out fluid emulation calculating.
Preferably, coal pulverizer inlet boundary condition data includes coal pulverizer inlet wind speed and coal pulverizer inlet pressure.
Preferably, average speed of the result data including impeller outlet, the Local Minimum speed of impeller outlet and impeller go out
The pressure drop of mouth.
Present invention optimizes the parameter value of each size of prophyll wheel apparatus, and it uses quantitative analysis means to demonstrate performance
Increase rate has many advantages, such as that structure changes small, easy implementation.
The technique effect of the design of the present invention, concrete structure and generation is described further below with reference to attached drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Description of the drawings
With reference to attached drawing, and by reference to following detailed description, it will more easily have more complete understanding to the present invention
And be more easily understood its with the advantages of and feature, wherein：
Fig. 1 is the flow of the coal pulverizer impeller unit improved method according to the preferred embodiment of the invention based on CFD technologies
Figure.
Fig. 2 is the guiding of the coal pulverizer impeller unit improved method according to the preferred embodiment of the invention based on CFD technologies
Plate quantity change schematic diagram.
Fig. 3 is the schematic diagram of influence of the guide plate angle according to the preferred embodiment of the invention to impeller outlet speed.
Fig. 4 is the signal of influence of guide plate according to the preferred embodiment of the invention (blade) quantity to impeller outlet speed
Figure.
Fig. 5 is the schematic diagram of the impeller outlet VELOCITY DISTRIBUTION under three kinds of wing plate sizes according to the preferred embodiment of the invention.
It should be noted that attached drawing is not intended to limit the present invention for illustrating the present invention.Note that represent that the attached drawing of structure can
It can be not necessarily drawn to scale.Also, in attached drawing, same or similar element indicates same or similar label.
Specific embodiment
Present invention employs CFD (Fluid Mechanics Computation) technologies, and impeller unit inlet and outlet region is analyzed from principle
Guide plate setting angle in impeller unit, wing plate quantity and width has been calculated according to practical inlet velocity in flow distribution
Change the affecting laws to average exit speed, Local Minimum speed and pressure drop, in conjunction with practical manufacture and mounting process, obtain
The improved impeller unit of structure is gone out.
Specifically, Fig. 1 is the coal pulverizer impeller unit improved method according to the preferred embodiment of the invention based on CFD technologies
Flow chart.
As shown in Figure 1, the coal pulverizer impeller unit improved method packet according to the preferred embodiment of the invention based on CFD technologies
It includes：
First step S1：Fluid domain geometrical model whole inside coal pulverizer is established, and carries out fluid grid division；
Preferably, fluid domain geometrical model whole inside coal pulverizer is established using SolidWorks softwares, and is used
ICEM tools carry out fluid grid division.
And preferably, modeling method is：The structural modeling of coal pulverizer is first carried out, then in software extracts fluid domain
Come, and using ICEM carry out fluid grid division, for convenience of divide, by fluid domain carry out stripping and slicing segmentation, then to each piece into
Row hexahedron or tetrahedral grid divide.
Second step S2：According to the coal pulverizer inlet boundary condition data that actual measurement obtains, the fluid domain geometry of foundation is utilized
Model and fluid grid divide, and establish computation model and carry out fluid emulation calculating；
Preferably, in second step, the pressure value of multiple points in interior flow field is extracted, is relatively tested with actual test value
Demonstrate,prove computation model reasonability；For example, the error of the pressure value and actual test value of extraction then judges within predetermined threshold range
Computation model is reasonable.
Preferably, computation model is established in fluent tools and carries out fluid emulation calculating.
Preferably, coal pulverizer inlet boundary condition data includes the data such as coal pulverizer inlet wind speed, coal pulverizer inlet pressure.
Preferably, predetermined threshold is 15%.
Third step S3：Change the setting angle of guide plate in impeller unit, the guide plate quantity in impeller unit and
Wing plate width, and extracted respectively in the difference of guide plate setting angle, guide plate quantity and wing plate width based on computation model
Data result under assembled state；For example, as shown in Figure 2.
For example, result data includes the Local Minimum speed and impeller outlet of the average speed of impeller outlet, impeller outlet
Pressure drop etc..
For example, the setting angle of guide plate in impeller unit is changed into 35 °, 40 °, 45 °, 50 ° and 55 ° successively, by leaf
Guide plate quantity in wheel apparatus changes into 28,32,36 and 40 successively, by wing plate width change into successively 31mm, 81mm and
131mm。
In specific application, specific data can be configured according to manufacture requirement and technological requirement.
Four steps S4：According to data result, impeller unit outlet performance indicator is obtained with guide plate setting angle, guiding
The changing rule of plate quantity and wing plate width.
5th step S5：According to practical manufacture requirement and mounting process requirement, installed using changing rule selective guide plate
Angle, guide plate quantity and wing plate width.
For example, in the example shown in Fig. 3, Fig. 4, Fig. 5 and table 1 below, table 2, table 3, guide plate angle and guide plate
The variation of quantity is limited to the improvement in impeller outlet flow field, and the variation of wing plate width to improve flow field play the role of it is larger.Again
With reference to practical manufacture and mounting process requirement, it may be determined that when going out improved impeller unit wing plate width for 131mm, after improvement
Impeller outlet average speed improve 25.18%, Local Minimum speed can be promoted compared to original structure (width 31mm)
38.94%, improve the separating effect of coal pulverizer.
Influence of the 1 impeller unit guide plate angle of table to impeller outlet flow field
Influence of the 2 impeller unit guide plate quantity of table to impeller outlet flow field
Influence of the 3 impeller unit wing plate width of table to impeller outlet flow field
As described above, the present invention goes out the affecting laws of output flow performance according to the wing plate change width for calculating gained
Hair has obtained the size for improving rear fender, has substantially increased the air outlet velocity of impeller and coal pulverizer separating effect；And the present invention
The Curve guide impeller period is substantially reduced based on CFD technologies, design cost and experimental cost is reduced, impeller unit structure is not being done
The air outlet velocity distribution situation of impeller is effectively improved on the basis of very big change.In addition, CFD technologies can be used to mill in the present invention
Whole flow field is modeled inside coal machine, applies the inlet boundaries conditions such as the inlet velocity actually measured and pressure, calculates gained
Within 15%, the reasonability of model is verified with measured data control errors in internal pressure field.
In short, present invention optimizes the parameter value of each size of prophyll wheel apparatus, and it uses quantitative analysis means to demonstrate
The increase rate of performance has many advantages, such as that structure changes small, easy implementation.
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not office
Be limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations, modification and
Environment, and can be changed in the scope of the invention is set forth herein by the above teachings or related fields of technology or knowledge
It is dynamic.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be appended by the present invention
In scope of the claims.
Claims (7)
1. a kind of coal pulverizer impeller unit improved method based on CFD technologies, it is characterised in that including：
First step：Fluid domain geometrical model whole inside coal pulverizer is established, and carries out fluid grid division；
Second step：According to the coal pulverizer inlet boundary condition data that actual measurement obtains, the fluid domain geometry mould of foundation is utilized
Type and the fluid grid divide, and establish computation model and carry out fluid emulation calculating；
Third step：It is wide to change the setting angle of guide plate, the guide plate quantity in impeller unit and wing plate in impeller unit
Degree, and different groups in guide plate setting angle, guide plate quantity and wing plate width are extracted based on the computation model respectively
Data result under conjunction state；
Four steps：According to the data result, obtain the impeller unit export performance indicator with guide plate setting angle, lead
To plate quantity and the changing rule of wing plate width；
5th step：Select the guide plate setting angle, the guide plate quantity and the wing plate wide using changing rule
Degree.
2. the coal pulverizer impeller unit improved method based on CFD technologies as described in claim 1, which is characterized in that use
SolidWorks softwares establish the fluid domain geometrical model whole inside coal pulverizer, and carry out the stream using ICEM tools
Volume mesh divides.
3. the coal pulverizer impeller unit improved method based on CFD technologies as claimed in claim 1 or 2, which is characterized in that
Two steps extract the pressure value of the multiple points in interior flow field, and relatively computation model reasonability is verified with actual test value.
4. the coal pulverizer impeller unit improved method based on CFD technologies as claimed in claim 3, which is characterized in that extraction
The error of the pressure value and the actual test value then judges that computation model is reasonable within predetermined threshold range.
5. the coal pulverizer impeller unit improved method based on CFD technologies as claimed in claim 1 or 2, which is characterized in that
The computation model is established in fluent tools and carries out the fluid emulation calculating.
6. the coal pulverizer impeller unit improved method based on CFD technologies as claimed in claim 1 or 2, which is characterized in that described
Coal pulverizer inlet boundary condition data includes coal pulverizer inlet wind speed and coal pulverizer inlet pressure.
7. the coal pulverizer impeller unit improved method based on CFD technologies as claimed in claim 1 or 2, which is characterized in that described
Result data includes average speed, the Local Minimum speed of impeller outlet and the pressure drop of impeller outlet of impeller outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711382709.2A CN108212348B (en) | 2017-12-20 | 2017-12-20 | CFD technology-based coal mill impeller device improvement method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711382709.2A CN108212348B (en) | 2017-12-20 | 2017-12-20 | CFD technology-based coal mill impeller device improvement method |
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| CN108212348A true CN108212348A (en) | 2018-06-29 |
| CN108212348B CN108212348B (en) | 2020-03-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108855573A (en) * | 2018-07-11 | 2018-11-23 | 上海电气上重碾磨特装设备有限公司 | A kind of coal pulverizer inlet air duct flow field improved method and structure based on CFD technology |
| CN112861444A (en) * | 2019-11-28 | 2021-05-28 | 上海电气上重碾磨特装设备有限公司 | Improved design method for side machine body drainage plate of medium-speed coal mill |
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| CN104258929A (en) * | 2014-09-17 | 2015-01-07 | 中国科学院上海高等研究院 | Grinding equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108855573A (en) * | 2018-07-11 | 2018-11-23 | 上海电气上重碾磨特装设备有限公司 | A kind of coal pulverizer inlet air duct flow field improved method and structure based on CFD technology |
| CN112861444A (en) * | 2019-11-28 | 2021-05-28 | 上海电气上重碾磨特装设备有限公司 | Improved design method for side machine body drainage plate of medium-speed coal mill |
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| Publication number | Publication date |
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| CN108212348B (en) | 2020-03-24 |
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