CN108855573A - A kind of coal pulverizer inlet air duct flow field improved method and structure based on CFD technology - Google Patents
A kind of coal pulverizer inlet air duct flow field improved method and structure based on CFD technology Download PDFInfo
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- CN108855573A CN108855573A CN201810759884.7A CN201810759884A CN108855573A CN 108855573 A CN108855573 A CN 108855573A CN 201810759884 A CN201810759884 A CN 201810759884A CN 108855573 A CN108855573 A CN 108855573A
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- coal pulverizer
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- Combined Means For Separation Of Solids (AREA)
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Abstract
Technical solution of the present invention discloses a kind of coal pulverizer inlet air duct flow field improved method based on CFD technology, and specific step is as follows：S1：Establish the geometrical model in coal pulverizer internal flow domain；S2：Computation model is established in fluid calculation software；S3：It adjusts the parameter value of coal pulverizer internal structure and is calculated according to computation model；S4：Extract the calculated result of each performance indicator；S5：According to the calculated result of S4, each performance indicator is obtained with the changing rule of parameter value；S6：According to practical manufacture and mounting process requirement, optimum parameter value is determined.The improved method that technical solution of the present invention provides substantially reduces the Curve guide impeller period, reduces design cost and experimental cost, the import wind speed profile situation of impeller is effectively improved on the basis of not doing very big change to structure.
Description
Technical field
The present invention relates to coal pulverizer inlet air duct technical field more particularly to a kind of coal pulverizer inlets based on CFD technology
Air duct flow field improved method and structure.
Background technique
In thermal power industry is required energy conservation and environmental protection and equipment performance higher and higher today, the transformation of coal pulverizer and excellent
Change has become one of many power plant's focus of attention, due to consideration that deficiency and the practical combustion of power plant present in structure design
With the diversity of coal, there is undercapacities, stone coal discharge exception, grinding roller and grinding disk for the medium-speed pulverizer that the country actually puts into operation
The problems such as pulverized coal fineness difference in exception, vane device card plug, the strenuous vibration of coal pulverizer, tube cell, these are largely effected on
The safety and economy of coal pulverizer or even unit.Existing medium-speed pulverizer all uses First air to be blown into bottom wind from side
Room, thus First air chamber interior Flow Field Distribution be influence coal pulverizer pebble coal rationally discharge, pulverized coal fineness, guarantee coal pulverizer just
Often an important factor for power output.
Chinese patent CN104096630A discloses a kind of bottom of medium-speed mill structure, in hollow cylindrical shape, in wind
Vane is offered above room, offers arc-shaped air inlet in the side wall of side, the external air inlet frid with air inlet duct of air inlet,
Two pieces of fan-shaped flow aprons are arranged in bottom plenum to alleviate or even disappear present invention optimizes the distribution situation of coal pulverizer flow field
Except side air inlet bring Flow Field Distribution unevenness phenomenon, realize stone coal discharge rationally, guarantee pulverizer capacity it is normal.
Chinese patent CN104353544A discloses a kind of medium-speed pulverizer equipressure air compartment, including is mounted on air compartment lateral wall
One arc of inside flows part, and the thickness for flowing part changes along the circumferencial direction of air compartment lateral wall, and the present invention is mainly logical
It crosses and flows part in the inside of air compartment lateral wall one arc of welding, width (or thick) degree of stream part is circumferentially variation, realization wind
Indoor isobaric design.
Chinese patent CN203598912U is related to a kind of coal pulverizer inlet air duct, and it includes an air duct, an air ducts
Entrance before the scraper plate room for entering coal pulverizer, is equipped with several spaced apart deflectors, and the utility model can effectively be kept away
Exempt from generation the phenomenon that tunnel inlet accumulates spontaneous combustion and scaling loss coal pulverizer inlet air duct such as pebble coal, the utility model is to coal pulverizer
The less investment of inlet conduits transformation, easily construction, quick, income is big.
However above-mentioned three kinds of existing technologies are all to increase guiding device in original structure or change completely primary
The overall structure of air compartment, according to qualitative empirical analysis or theory analysis, not quantitative data supporting can obtain some effects
Fruit, but the problem of exist simultaneously there are two：First is that needing to change air compartment overall structure or in entrance since structural modification is larger
New guiding device is installed, therefore relatively time consuming laborious in air duct；Second is that due to not rigorous data supporting, when inlet velocity,
When the variation of the various aspects such as coal quality and external environment, can not flexible adjusting device to optimal operational condition, when coal pulverizer runs one
After the section time, optimal operating condition can be gradually deviated from.
Summary of the invention
The technical problem to be solved is that provide a kind of coal pulverizer inlet air duct based on CFD technology for technical solution of the present invention
Flow field improved method, to solve the defect occurred in above-mentioned background technique.CFD (Computational Fluid of the invention
Dynamics) refer to fluid dynamics, basic principle is then the differential equation of numerical solution control fluid flowing, obtains fluid
Discrete distribution of the flow field of flowing on continuum, thus approximate simulation fluid mobility status.
In order to solve the above technical problems, technical solution of the present invention provides a kind of coal pulverizer inlet wind based on CFD technology
Road flow field improved method, specific step is as follows：S1：Establish the geometrical model in coal pulverizer internal flow domain；S2：It is soft in fluid calculation
Computation model is established in part；S3：It adjusts the parameter value of coal pulverizer internal structure and is calculated according to computation model；S4：It extracts
The calculated result of each performance indicator；S5：According to the calculated result of S4, each performance indicator is obtained with the changing rule of parameter value；S6：
According to practical manufacture and mounting process requirement, optimum parameter value is determined.
Optionally, the step S1 specifically comprises the following steps：S11：Coal pulverizer is established using SolidWorks software
Structural model is also possible to other modeling softwares, such as CAD, 3DMAX, PRO/E, depending on the circumstances；S12：From structure mould
Fluid domain is plucked out in type and use ICEM carry out fluid grid division, can also use other modeling softwares, as GAMBIT,
Pointwise, NUMECA, CFD etc., it is depending on the circumstances.
Optionally, the structural model includes an air compartment, impeller unit, top cylinder, rotor block and goes out upwards in turn
Mouthful, the side wall of an air compartment is equipped with First air air duct, and the interface of the First air air duct and an air compartment is mill
Several deflectors are arranged in coal machine entrance, inlet.
Optionally, in step s 12, to fluid grid divide the specific steps are：Fluid domain is subjected to stripping and slicing segmentation, it is right
Each piece of progress grid dividing.
Optionally, the mesh shape is hexahedron or tetrahedron.
Optionally, the step S2 includes：S21：Computation model is established in Fluent, in addition to Fluent, can also be used
Other fluid calculation softwares, such as CFD-FASTRAN, ANSYS, Flowmaster, ZONA-ZAERO, it is depending on the circumstances；
S22：Obtain the computation model rationalized：It is calculated according to the measured value of coal pulverizer inlet wind speed and pressure, after the completion of calculating
If extracting the calculation of pressure value done in geometrical model, compare calculation of pressure value and measured value to verify the reasonable of computation model
Property, if the difference of calculated value and measured value, within ± 15%, computation model is reasonable；If computation model is unreasonable, weight is needed
Multiple step S1 and S2 during rationalization, need to be arranged impeller unit Partial Mesh until obtaining reasonable computation model
It is rotating coordinate system, tarnsition velocity of putting english with rotor volume mesh.
Optionally, in step s3, the parameter value includes inlet conduits deflector angle, inlet tubing lengths, entrance
Pipeline dog-ear.
Optionally, performance indicator includes in step S4：Average speed, Local Minimum speed and pressure drop at impeller inlet.
Another aspect of the present invention provides a kind of coal pulverizer inlet air duct flow field structure, by above-mentioned based on CFD technology
Obtained by coal pulverizer inlet air duct flow field improved method.
Optionally, the range of inlet conduits deflector angle angle is 35 °~42 °, and inlet tubing lengths are 2~4m, is entered
The range of mouth pipeline dog-ear is 10 °~25 °.
Compared with prior art, improved method of the invention show that impeller fills according to the resulting calculated result of actual condition
Inlet flow field performance indicator is set with the changing rule of inlet conduits structural parameters, is wanted in conjunction with actual manufacture and mounting process
It asks, the optimal parameter range of inlet conduits deflector angle, inlet tubing lengths, inlet duct dog-ear is obtained after Comprehensive Assessment,
It obtains and improves rear entrance air duct optimal parameter, improve the import wind speed and coal pulverizer separating effect of impeller, greatly shorten simultaneously
Curve guide impeller period reduces design cost and experimental cost, effectively improves on the basis of not doing very big change to structure
The import wind speed profile situation of impeller.Simultaneously when the variation of the conditions such as import wind speed, the method still can be used and calculated,
The best inlet conduits parameters of structural dimension of external environment after determining corresponding variation.
Detailed description of the invention
Fig. 1 is the flow chart of coal pulverizer inlet air duct flow field improved method of the invention；
Fig. 2 is the flow chart of the coal pulverizer inlet air duct flow field improved method of the embodiment of the present invention；
Fig. 3 is deflector setting angle, inlet pipeline extension, the inlet pipeline dog-ear schematic diagram of the embodiment of the present invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
Coal pulverizer inlet air duct flow field improved method shown in Figure 1, of the invention, includes the following steps：
S1：Establish the geometrical model in coal pulverizer internal flow domain；
S2：Computation model is established in fluid calculation software；
S3：It adjusts the parameter value of coal pulverizer internal structure and is calculated according to computation model；
S4：Extract the calculated result of each performance indicator；
S5：According to the calculated result of S4, each performance indicator is obtained with the changing rule of parameter value；
S6：According to practical manufacture and mounting process requirement, optimum parameter value is determined.
Shown in referring to figure 2., the coal pulverizer inlet air duct flow field improved method of one embodiment of the invention, including walk as follows
Suddenly：
S11：The structural model of coal pulverizer is established using SolidWorks software, in other embodiments, it can also be used
His modeling software, such as CAD, 3DMAX, PRO/E；
S12：Fluid domain is plucked out from structural model and ICEM is used to carry out fluid grid division, in other embodiments
In, GAMBIT, Pointwise, NUMECA, CFD can be used and carry out grid dividing；
S21：Computation model is established in Fluent, in other embodiments, other fluid calculation softwares can also be used, such as
CFD-FASTRAN,ANSYS,Flowmaster,ZONA-ZAERO；
S22：Obtain the computation model rationalized：It is calculated, is counted according to the measured value of coal pulverizer inlet wind speed and pressure
If extracting the calculation of pressure value done in geometrical model after the completion of calculating, compare calculation of pressure value and measured value to verify computation model
Reasonability, if the difference of calculated value and measured value, within ± 15%, computation model is reasonable；If computation model is unreasonable,
It needs to repeat step S1 and S2, until obtaining reasonable computation model, it should be noted that impeller unit is arranged in the process
Partial Mesh and rotor volume mesh are rotating coordinate system, tarnsition velocity of putting english.
S3：Inlet conduits deflector angle, the size of inlet tubing lengths, inlet duct dog-ear are adjusted, and according to calculating
Model is calculated；
S4：Extract average speed, Local Minimum speed and the calculated result of pressure drop at impeller inlet；
S5：According to the calculated result of S4, inlet conduits deflector angle, inlet tubing lengths, inlet duct dog-ear are obtained
With average speed, Local Minimum speed and the changing rule of pressure drop at impeller inlet；
S6：According to practical manufacture and mounting process requirement, optimum parameter value is determined.
Referring to figure 3., in the present embodiment, structural model includes an air compartment 2, impeller unit, top cylinder upwards in turn
The side wall of body, rotor block and outlet, an air compartment is equipped with First air air duct, the First air air duct 1 and the First air
The interface of room 2 is coal pulverizer inlet, and several inlet conduits deflectors 3 are arranged in inlet.
3 angle [alpha] of inlet conduits deflector is 33 ° in original coal pulverizer inlet air duct flow field structure, inlet tubing lengths
It is 5 ° for 1.19m, inlet duct dog-ear θ, and implementation of the present invention is obtained based on above-mentioned coal pulverizer inlet air duct flow field improved method
The coal pulverizer inlet air duct flow field structural parameters of example, inlet conduits deflector angle angle α are 35 °~42 °, inlet tube road length
Degree is 2~3 times of original length, and effect is preferable when inlet duct dog-ear θ is 10 °~25 °, and impeller inlet bulk velocity can be promoted
5~10%, Local Minimum speed can promote 15~20%, and inlet flow field uniformity promotes 10~20%, be greatly improved mill
The separating effect of coal machine.
Through synthetical comparison and assessment, the optimum parameter value under actual condition is obtained：1 angle angle α of inlet conduits deflector is 39 °,
Inlet tubing lengths L is 3.38m, and inlet duct dog-ear θ is 21 °, and under the parameter value, impeller inlet Local Minimum speed is improved
18.1%, impeller inlet bulk velocity increases 13.6%, and entrance uniformity promotes 15.2%, significantly improves coal pulverizer
Separating effect.
In conclusion the coal pulverizer inlet air duct flow field improved method based on CFD technology of the present embodiment is with following excellent
Point：
1, quantitative analysis method
Coal pulverizer inside entirety flow field is modeled using CFD technology, applies the inlet velocity and pressure of actual measurement
Equal inlet boundaries condition, calculated result and measured data control errors demonstrate the reasonability of model within 15%.According to meter
It calculates resulting different parameters variation to set out to the affecting laws of impeller inlet mobile performance, has shown that improvement rear entrance air duct is best
Parameter substantially increases the import wind speed and coal pulverizer separating effect of impeller.
2, the convenience and adaptability of method
This method substantially reduces the Curve guide impeller period, reduces design cost and experimental cost, very big not doing to structure
The import wind speed profile situation of impeller is effectively improved on the basis of change.Simultaneously when the variation of the conditions such as import wind speed, still
The method can be used to be calculated, the best inlet conduits parameters of structural dimension of the external environment after determining corresponding variation.
Specific embodiments of the present invention are described in detail above, it should be understood that those skilled in the art are without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of coal pulverizer inlet air duct flow field improved method based on CFD technology, which is characterized in that specific step is as follows：
S1：Establish the geometrical model in coal pulverizer internal flow domain；
S2：Computation model is established in fluid calculation software；
S3：It adjusts the parameter value of coal pulverizer internal structure and is calculated according to computation model；
S4：Extract the calculated result of each performance indicator；
S5：According to the calculated result of S4, each performance indicator is obtained with the changing rule of parameter value；
S6：According to practical manufacture and mounting process requirement, optimum parameter value is determined.
2. the coal pulverizer inlet air duct flow field improved method based on CFD technology as described in claim 1, which is characterized in that institute
Step S1 is stated to specifically comprise the following steps：
S11：The structural model of coal pulverizer is established using SolidWorks software；
S12：Fluid domain is plucked out from structural model and ICEM is used to carry out fluid grid division.
3. the coal pulverizer inlet air duct flow field improved method based on CFD technology as claimed in claim 2, which is characterized in that institute
Structural model is stated upwards in turn and includes an air compartment, impeller unit, top cylinder, rotor block and outlet, an air compartment
Side wall is equipped with First air air duct, and the interface of the First air air duct and an air compartment is coal pulverizer inlet, and inlet is set
Set several deflectors.
4. the coal pulverizer inlet air duct flow field improved method based on CFD technology as claimed in claim 2, which is characterized in that
In step S12, to fluid grid divide the specific steps are：Fluid domain is subjected to stripping and slicing segmentation, each piece of progress grid is drawn
Point.
5. the coal pulverizer inlet air duct flow field improved method based on CFD technology as claimed in claim 4, which is characterized in that institute
Stating mesh shape is hexahedron or tetrahedron.
6. the coal pulverizer inlet air duct flow field improved method based on CFD technology as described in claim 1, which is characterized in that institute
Stating step S2 includes：
S21：Computation model is established in Fluent；
S22：Obtain the computation model rationalized：It is calculated, is had been calculated according to the measured value of coal pulverizer inlet wind speed and pressure
If comparing calculation of pressure value and measured value at the calculation of pressure value done in rear extraction geometrical model to verify the conjunction of computation model
Rationality, if the difference of calculated value and measured value, within ± 15%, computation model is reasonable；If computation model is unreasonable, need
Step S1 and S2 are repeated, until obtaining reasonable computation model.
7. the coal pulverizer inlet air duct flow field improved method based on CFD technology as described in claim 1, which is characterized in that
In step S3, the parameter value includes inlet conduits deflector angle, inlet tubing lengths, inlet duct dog-ear.
8. the coal pulverizer inlet air duct flow field improved method based on CFD technology as described in claim 1, which is characterized in that step
Performance indicator includes in rapid S4：Average speed, Local Minimum speed and pressure drop at impeller inlet.
9. a kind of coal pulverizer inlet air duct flow field structure, which is characterized in that by the described in any item bases of the claims 1~8
Obtained by the coal pulverizer inlet air duct flow field improved method of CFD technology.
10. coal pulverizer inlet air duct flow field structure as claimed in claim 9, which is characterized in that inlet conduits deflector angle
The range of angle is 35 °~42 °, and inlet tubing lengths are 2~4m, and the range of inlet duct dog-ear is 10 °~25 °.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111832198A (en) * | 2019-04-17 | 2020-10-27 | 中石化石油工程技术服务有限公司 | Jet generator oscillation cavity design method for pulse drilling and jet generator |
| 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 |
| CN114091364A (en) * | 2021-10-08 | 2022-02-25 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Method for optimizing whole rubber ball system and flow field structure of rubber ball collecting net |
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| CN114091364A (en) * | 2021-10-08 | 2022-02-25 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Method for optimizing whole rubber ball system and flow field structure of rubber ball collecting net |
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