CN108212348B - CFD technology-based coal mill impeller device improvement method - Google Patents
CFD technology-based coal mill impeller device improvement method Download PDFInfo
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- CN108212348B CN108212348B CN201711382709.2A CN201711382709A CN108212348B CN 108212348 B CN108212348 B CN 108212348B CN 201711382709 A CN201711382709 A CN 201711382709A CN 108212348 B CN108212348 B CN 108212348B
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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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Abstract
A coal mill impeller device improvement method based on CFD technology comprises the following steps: the first step is as follows: establishing an integral fluid domain geometric model inside the coal mill, and performing fluid mesh division; the second step is as follows: according to boundary condition data of the coal mill inlet obtained through actual measurement, establishing a calculation model for carrying out fluid simulation calculation by utilizing the established fluid domain geometric model and the fluid grid division; the third step: changing the installation angle of a guide plate in the impeller device, the number of the guide plates in the impeller device and the width of a wing plate, and respectively extracting data results in different combination states of the installation angle of the guide plate, the number of the guide plates and the width of the wing plate based on the calculation model; the fourth step: obtaining the change rule of the performance index of the outlet of the impeller device along with the installation angle of the guide plates, the number of the guide plates and the width of wing plates according to the data result; the fifth step: and selecting the installation angle of the guide plates, the number of the guide plates and the width of the wing plate by utilizing a change rule.
Description
Technical Field
The invention relates to the field of coal mill impeller devices, in particular to an improvement method of a coal mill impeller device based on a CFD (computational fluid dynamics) technology.
Background
The impeller device is an intermediate position key component which is connected with a primary air chamber and a separator body in the HP coal mill, is connected with a grinding bowl and rotates along with the grinding bowl, and has the function of uniformly distributing hot air blown from the primary air chamber after passing through the impeller device and driving ground pulverized coal particles to enter the separator body of the coal mill for pulverized coal separation.
The research on the impeller device improves the outlet speed of the impeller and the uniformity of the speed, and has an important effect on the separation effect of the pulverized coal. The patent application CN203816750U entitled "bowl formula medium speed pulverizer impeller device" discloses a bowl formula medium speed pulverizer impeller device, comprises mounting panel, outer panel and a plurality of baffle, and the baffle both ends are provided with concave surface respectively, make the baffle be biconcave curved surface form for can not produce the air current vortex in the air current passageway that forms between the baffle, improve impeller device's life. In patent application CN203737378U entitled "bowl impeller device of coal pulverizer", by providing a buffer plate, pebble coal thrown out and coal can be rapidly decelerated and separated after shaping, so as to avoid the phenomenon of coal contained in the pebble coal, thereby improving the utilization rate of coal by a power plant. The pulverized coal combustion device has the advantages that hot air passing through the pulverized coal combustion device is more uniform, so that the uniformity of pulverized coal is improved, the pulverized coal is combusted more fully, the combustion efficiency of a boiler is improved, and the effects of saving energy, reducing consumption, reducing emission and protecting the environment are achieved. Patent application CN204034849U entitled "a new impeller device" discloses a new impeller device suitable for a HP-type medium speed coal mill, which is installed on the grinding bowl of the coal mill, comprising a throttle ring, an adjustable plate, a guide plate, a side plate, a wind ring. The efficiency of the impeller device to the separation of pebble coal is improved for the coal pulverizer pebble coal emission is showing and is being reduced. The erosion and abrasion of hot primary air to the side plate of the impeller device in operation are reduced, the problems that a throttling ring is easy to abrade and drop, the side plate is abraded quickly and the like in the operation of the impeller device are solved, and the power consumption of a motor is reduced.
However, the coal mill impeller device generally adopts foreign technologies and drawings, and in domestic actual use, due to the fact that actual working conditions and coal quality conditions are greatly different from those of foreign countries, domestic enterprises usually do not carry out further structural improvement on the impeller device according to the actual working conditions, or the improved method lacks sufficient technical support, or the structural improvement is large, and the defect of high payment cost is caused.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for improving a coal mill impeller device based on CFD technology, which can achieve a small structural improvement of the impeller device according to actual working conditions, and achieve high efficiency.
In order to achieve the above object, the present invention provides an improved method for a coal mill impeller device based on CFD technology, comprising: the first step is as follows: establishing an integral fluid domain geometric model inside the coal mill, and performing fluid mesh division; the second step is as follows: according to boundary condition data of the coal mill inlet obtained through actual measurement, establishing a calculation model for carrying out fluid simulation calculation by utilizing the established fluid domain geometric model and the fluid grid division; the third step: changing the installation angle of a guide plate in the impeller device, the number of the guide plates in the impeller device and the width of a wing plate, and respectively extracting data results in different combination states of the installation angle of the guide plate, the number of the guide plates and the width of the wing plate based on the calculation model; the fourth step: obtaining the change rule of the performance index of the outlet of the impeller device along with the installation angle of the guide plates, the number of the guide plates and the width of wing plates according to the data result; the fifth step: and selecting the installation angle of the guide plates, the number of the guide plates and the width of the wing plate by utilizing a change rule.
Preferably, a fluid domain geometric model of the whole interior of the coal mill is established by using SolidWorks software, and an ICEM tool is used for carrying out fluid meshing.
Preferably, in a second step, pressure values for a plurality of points in the internal flow field are extracted and compared with actual test values to verify the computational model plausibility.
Preferably, the error between the extracted pressure value and the actual test value is within a predetermined threshold range, and the calculation model is judged to be reasonable.
Preferably, a computational model is built in the fluent tool for fluid simulation computation.
Preferably, the coal mill inlet boundary condition data includes a coal mill inlet air speed and a coal mill inlet pressure.
Preferably, the result data includes an average speed of the impeller exit, a local minimum speed of the impeller exit, and a pressure drop at the impeller exit.
The invention optimizes the parameter values of all dimensions of the original impeller device, verifies the improvement range of the performance by adopting a quantitative analysis means, and has the advantages of small structural change, easy implementation and the like.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:
FIG. 1 is a flow chart of a method for improving a coal pulverizer impeller device based on CFD technology in accordance with a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a variation in the number of guide plates in the method for improving the impeller device of the coal mill based on the CFD technology according to the preferred embodiment of the present invention.
FIG. 3 is a schematic illustration of the effect of the guide plate angle on impeller exit velocity according to a preferred embodiment of the present invention.
Fig. 4 is a schematic illustration of the effect of the number of guide plates (vanes) on the impeller exit velocity according to a preferred embodiment of the present invention.
Fig. 5 is a schematic illustration of impeller exit velocity profiles for three vane sizes in accordance with a preferred embodiment of the present invention.
It is to be noted, however, that the appended drawings illustrate rather than limit the invention. It is noted that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.
Detailed Description
The invention adopts the CFD (computational fluid dynamics) technology, analyzes the flow distribution of the inlet and outlet areas of the impeller device in principle, calculates the influence rule of the installation angle of the guide plate, the quantity and the width change of wing plates in the impeller device on the average speed of the outlet, the local minimum speed and the pressure drop according to the actual inlet wind speed, and combines the actual manufacturing and installation process to obtain the impeller device with improved structure.
Specifically, fig. 1 is a flow chart of a method for improving a coal pulverizer impeller device based on CFD technology according to a preferred embodiment of the present invention.
As shown in fig. 1, a method for improving a coal mill impeller device based on CFD technology according to a preferred embodiment of the present invention includes:
first step S1: establishing an integral fluid domain geometric model inside the coal mill, and performing fluid mesh division;
preferably, a fluid domain geometric model of the whole interior of the coal mill is established by using SolidWorks software, and an ICEM tool is used for carrying out fluid meshing.
Also preferably, the modeling method is: firstly, carrying out structural modeling on a coal mill, then extracting a fluid domain from software, carrying out fluid meshing by adopting ICEM (intensive care imaging), cutting and dividing the fluid domain into blocks for convenient division, and then carrying out hexahedron or tetrahedron meshing on each block.
Second step S2: according to boundary condition data of the coal mill inlet obtained through actual measurement, establishing a calculation model for carrying out fluid simulation calculation by utilizing the established fluid domain geometric model and fluid grid division;
preferably, in the second step, pressure values of a plurality of points in the internal flow field are extracted and compared with actual test values to verify the reasonability of the calculation model; for example, if the error between the extracted pressure value and the actual test value is within a predetermined threshold, the calculation model is determined to be reasonable.
Preferably, a computational model is built in the fluent tool for fluid simulation computation.
Preferably, the coal mill inlet boundary condition data includes coal mill inlet wind speed, coal mill inlet pressure, and the like.
Preferably, the predetermined threshold is 15%.
Third step S3: changing the installation angle of a guide plate in the impeller device, the number of the guide plates in the impeller device and the width of a wing plate, and respectively extracting data results in different combination states of the installation angle of the guide plate, the number of the guide plates and the width of the wing plate based on a calculation model; for example, as shown in fig. 2.
For example, the resulting data includes the average speed of the impeller exit, the local minimum speed of the impeller exit, the pressure drop at the impeller exit, and the like.
For example, the installation angles of the guide plates in the impeller device are changed to 35 °, 40 °, 45 °, 50 °, and 55 ° in this order, the number of guide plates in the impeller device is changed to 28, 32, 36, and 40 in this order, and the wing widths are changed to 31mm, 81mm, and 131mm in this order.
The specific data may be set according to manufacturing requirements and process requirements at the time of a specific application.
Fourth step S4: and acquiring the change rule of the performance index of the outlet of the impeller device along with the installation angle of the guide plates, the number of the guide plates and the width of wing plates according to the data result.
Fifth step S5: and selecting the installation angle of the guide plates, the number of the guide plates and the width of wing plates by utilizing a change rule according to actual manufacturing requirements and installation process requirements.
For example, in the examples shown in fig. 3, 4, 5 and tables 1, 2, 3 below, the variation in the guide plate angle and the number of guide plates has limited effect on the improvement of the impeller exit flow field, while the variation in the vane width has a greater effect on the improvement of the flow field. And by combining with the actual manufacturing and installation process requirements, the improved impeller device wing plate width can be determined to be 131mm, the improved impeller outlet average speed is improved by 25.18%, the local minimum speed can be improved by 38.94% compared with the original structure (the width is 31mm), and the separation effect of the coal mill is improved.
TABLE 1 influence of guide plate included angle of impeller device on impeller outlet flow field
TABLE 2 influence of the number of guide plates of the impeller device on the flow field at the outlet of the impeller
TABLE 3 influence of vane device vane width on the impeller exit flow field
According to the method, the size of the improved rear wing plate is obtained according to the rule of the influence of the calculated width change of the wing plate on the flow performance of the outlet, and the outlet wind speed of the impeller and the separation effect of the coal mill are greatly improved; and the invention greatly shortens the improved design cycle based on the CFD technology, reduces the design cost and the experiment cost, and effectively improves the outlet wind speed distribution condition of the impeller on the basis of not greatly changing the structure of the impeller device. In addition, the CFD technology can be adopted to model the internal whole flow field of the coal mill, inlet boundary conditions such as actually measured inlet wind speed and pressure are applied, the error between the calculated internal pressure field and actually measured data is controlled within 15%, and the rationality of the model is verified.
In a word, the invention optimizes the parameter values of all the dimensions of the original impeller device, verifies the improvement range of the performance by adopting a quantitative analysis means, and has the advantages of small structural change, easy implementation and the like.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A coal mill impeller device improvement method based on CFD technology is characterized by comprising the following steps:
the first step is as follows: establishing a fluid domain geometric model of the whole interior of the coal mill, and performing fluid mesh division, wherein the modeling method comprises the following steps: firstly, carrying out structural modeling on a coal mill, then extracting a fluid domain, carrying out fluid mesh division by adopting an ICEM (Integrated Circuit Electron microscope) tool, cutting and dividing the fluid domain into blocks, and then carrying out hexahedron or tetrahedral mesh division on each block;
the second step is as follows: according to boundary condition data of the coal mill inlet obtained through actual measurement, establishing a calculation model for carrying out fluid simulation calculation by utilizing the established fluid domain geometric model and the fluid grid division;
the third step: changing the installation angle of the guide plates in the impeller device, the number of the guide plates in the impeller device and the width of the wing plate, and respectively extracting data results in different combination states of the installation angle of the guide plates, the number of the guide plates and the width of the wing plate based on the calculation model;
the fourth step: obtaining the change rule of the performance index of the outlet of the impeller device along with the installation angle of the guide plates, the number of the guide plates and the width of wing plates according to the data result;
the fifth step: and selecting the installation angle of the guide plates, the number of the guide plates and the width of the wing plate by utilizing a change rule.
2. The CFD technology-based coal pulverizer impeller device improvement method as claimed in claim 1, wherein the fluid domain geometric model of the coal pulverizer internal ensemble is established using SolidWorks software and the fluid meshing is performed using an ICEM tool.
3. The method for improving the impeller device of the coal mill based on the CFD technology is characterized in that in the second step, pressure values of a plurality of points in the internal flow field are extracted and compared with actual test values to verify the reasonableness of the calculation model.
4. The method of claim 3, wherein the error between the extracted pressure value and the actual test value is within a predetermined threshold range, and the computational model is determined to be reasonable.
5. The method of improving a coal pulverizer impeller device based on CFD technology of claim 1 or 2, wherein the fluid simulation calculation is performed by building the calculation model in a fluent tool.
6. The method of improving a coal mill impeller device based on CFD technology of claim 1 or 2, wherein the coal mill inlet boundary condition data includes a coal mill inlet wind speed and a coal mill inlet pressure.
7. The CFD technology based coal pulverizer impeller device improvement method of claim 1 or 2, wherein the data results include an average velocity of the impeller outlet, a local minimum velocity of the impeller outlet, and a pressure drop at the impeller outlet.
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| CN108855573B (en) * | 2018-07-11 | 2020-03-24 | 上海电气上重碾磨特装设备有限公司 | CFD technology-based coal mill inlet air duct flow field improvement method and structure |
| CN112861444B (en) * | 2019-11-28 | 2023-01-03 | 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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| US20120042737A1 (en) * | 2010-04-13 | 2012-02-23 | New Jersey Institute Of Technology | Novel dissolution testing system and apparatus with off-center impeller |
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| KR20150113581A (en) * | 2014-03-31 | 2015-10-08 | 주식회사 멕 아이씨에스 | Element detecting mehtod for impeller of 2 step radial blower |
| CN104258929A (en) * | 2014-09-17 | 2015-01-07 | 中国科学院上海高等研究院 | Grinding equipment |
| CN204276130U (en) * | 2014-10-30 | 2015-04-22 | 广东大唐国际潮州发电有限责任公司 | A kind of HP type coal pulverizer vane flabellum |
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