CN202942931U - Coal mill and grinding mechanism thereof - Google Patents
Coal mill and grinding mechanism thereof Download PDFInfo
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- CN202942931U CN202942931U CN 201220579943 CN201220579943U CN202942931U CN 202942931 U CN202942931 U CN 202942931U CN 201220579943 CN201220579943 CN 201220579943 CN 201220579943 U CN201220579943 U CN 201220579943U CN 202942931 U CN202942931 U CN 202942931U
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- grinding
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- roller
- liner plate
- roller shell
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Abstract
The utility model provides a coal mill and a grinding mechanism thereof. The grinding mechanism comprises a grinding disc and a grinding roller, wherein a lining plate is arranged on the grinding disc; a roller sleeve is sleeved on the grinding roller; and the grinding roller props against the lining plate. The grinding mechanism is characterized in that the maximum outer diameter Dg of the roller sleeve is equal to (7/9)*D0, wherein the D0 is the medium diameter of the grinding disc and the unit is mm; the width Bg of the roller sleeve is equal to DG/3+50; one half of the outer circular-arc central angle Theta g of the roller sleeve is equal to 39 degrees; the outer circular-arc radius Rg of the roller sleeve is equal to (Bg/2)/Sin Theta g; the outer circular-arc wall thickness dg of the roller sleeve is equal to Dg/15; the circular-arc radius Rc of the lining plate is 8/7Rg-10; the central thickness sigma c of the lining plate is equal to 0.05 D0; the outer edge width Bcw of the lining plate is equal to 0.02 D0; and the wrap angel alpha of the lining plate is between 36 degrees and 42 degrees. The grinding mechanism disclosed by the utility model can be used for effectively improving the grinding force of the coal mill and reducing the grinding power consumption of the coal mill, and is more conductive to satisfying the pebble coal emission requirements of the coal mill, improving the service lives of wear-resistant parts and reducing the operation and maintenance cost.
Description
Technical field
The utility model relates to a kind of coal pulverizer, relates in particular to coal pulverizer roller shell, liner plate, and particularly the molded line of milling of roller shell and liner plate, belong to coal pulverizer design and manufacturing field.
Background technology
When coal pulverizer grinds into qualified coal dust to raw coal, need to mill to material by the zone of milling.During the coal pulverizer operation, as shown in Figure 1, by Motor Drive, driving coal pulverizer mill 20 by planetary reducer rotates, three grinding rollers 10 on mill 20 rotate under the drive of mill 20, be distributed on mill 20 through the raw coal that coal spout is come in, due to the effect of loading force, produce extruding between grinding roller 10 and mill 20 and make large coal particles crushed.Realize that by grinding roller 10 and the force of sliding friction of the relative motion generation of mill 20 small-particle coal is pulverized.In process of lapping, the scope of activities of grinding roller 10 is three degree of freedom, be also rotation, up and down, the three degree of freedom of horizontal direction.
As shown in Figure 2, as the vitals of coal pulverizer, the molded line of roller shell 1 and liner plate 2 changes the parameters such as the power consumption, stone coal discharge amount of the grinding efficiency directly have influence on coal pulverizer, coal pulverizer.Due to the continuous variation of coal, meager coal, low calorific value coal get more and more, and the molded line of milling of present coal pulverizer exists the decline of exerting oneself, the more high phenomenon of power consumption to grinding this type of coal.
Summary of the invention
The purpose of this utility model is to provide a kind of coal pulverizer and milling mechanism thereof, to solve the problems such as the decline of exerting oneself that exists when existing coal pulverizer grinds meager coal, low calorific value coal, power consumption height.
In order to address the above problem, on the one hand, the utility model provides a kind of coal pulverizer milling mechanism, it comprises mill and grinding roller, be provided with liner plate on described mill, be arranged with roller shell on described grinding roller, described roller shell and described liner plate butt, it is characterized in that roller shell maximum outside diameter Dg=(7/9) * D
0, D
0Be the mill central diameter, the mm of unit; Roller shell width B g=Dg/3+50, the mm of unit; Half θ g=39 of roller shell external arc central angle °; Roller shell outer arc radius Rg=(Bg/2)/Sin θ g, the mm of unit; Roller shell external arc wall thickness dg=Dg/15, the mm of unit; Liner plate arc radius Rc=8/7Rg-10, the mm of unit; Liner plate center thickness δ c=0.05D
0, the mm of unit; Liner plate outer width B cw=0.02D
0, the mm of unit; The wrap angle sigma of liner plate is between 36 °～42 °.
In order to address the above problem, on the other hand, the utility model provides a kind of coal pulverizer, and it comprises milling mechanism, and wherein, described milling mechanism is described coal pulverizer milling mechanism.
According to a kind of preferred embodiment of above-mentioned coal pulverizer, wherein, described coal pulverizer is medium-speed pulverizer.
By upper analysis, the utility model is for adapting to coal type change, the zone of milling to coal pulverizer is optimized to adapt to the needs that special coal types is milled, whereby, the utility model can effectively improve milling of coal pulverizer exerts oneself, and reduces the power consumption of milling of coal pulverizer, more is conducive to the requirement of coal pulverizer stone coal discharge, improve the life-span of wearing piece, reduce operation and recondition expense.
Description of drawings
Fig. 1 is the stress schematic diagram of coal pulverizer;
Fig. 2 is the structural representation of the milling mechanism of existing coal pulverizer;
Fig. 3 is the structural representation of milling mechanism of the present utility model;
Fig. 4 is the sectional structure schematic diagram of the liner plate of milling mechanism of the present utility model;
Fig. 5 is the sectional structure schematic diagram of the roller shell of milling mechanism of the present utility model.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
As shown in Figure 3, coal pulverizer milling mechanism of the present utility model comprises the roller shell 3 and the liner plate 4 that is arranged on mill, wherein roller shell 3 and liner plate 4 butts that is arranged on grinding roller.Grinding roller mainly partly is comprised of roll shaft (not shown), bearing (not shown), roller core (not shown), roller shell 3 etc., and roller shell 3 is the outermost layer part of grinding roller, namely with the part of material contact squeeze, belongs to wearing piece.
The maximum outside diameter Dg=(7/9) of roller shell 3 * D
0, D wherein
0Be the mill diameter, the mm of unit; The width B g=Dg/3+50 of roller shell 3, the mm of unit; Half θ g=39 of the external arc central angle of roller shell 3 °; The outer arc radius Rg=(Bg/2 of roller shell 3)/Sin θ g, the mm of unit; The external arc wall thickness dg=Dg/15 of roller shell 3, the mm of unit; The arc radius Rc=8/7Rg-10 of liner plate 4, the mm of unit; The center thickness δ c=0.05D of liner plate 4
0, the mm of unit; The outer width B cw=0.02D of liner plate 4
0, the mm of unit; The wrap angle sigma of liner plate 4 is between 36 °～42 °.
The relevant position of the wrap angle sigma of Dg, D0, Bg, θ g, Rg, dg, Rc, δ c, Bcw, liner plate such as Fig. 3, Fig. 4 and shown in Figure 5, in Fig. 4, some A is the contact point of roller shell 3 and liner plate 4.Particularly, Dg refers to the maximum outside diameter of roller shell, D0 refers to that the central diameter of mill is the diameter at roller-way place, Bg refers to the width of roller shell, θ g refers to half of the corresponding central angle angle of roller shell external arc, Rg refers to the radius of curvature of the external arc of roller shell, dg refers to the roller shell thickness at the maximum outside diameter place of roller shell, Rc refers to the circular arc radius of curvature of liner plate, δ c refers to the thickness of liner plate thinnest part, Bcw refers to the thickness at place, liner plate outer, and the liner plate wrap angle sigma refers to that the liner plate outer is to the corresponding central angle of circular arc of the liner plate roller-way above-mentioned contact point A in place.Compared with prior art, the utility model is optimized design to the molded line of milling of roller shell 3 and liner plate 4, is specially, and has increased the external arc radius of curvature of roller shell 3 and liner plate 4; Increased the width of roller shell 3; The cornerite design of liner plate 4 is less, selects between 36 °～42 °.Whereby, can realize that roller shell 3 utilizes the space of milling as far as possible in the scope of milling that allows; The molded line of roller shell 3 and liner plate 4 coordinates milder; Increase roller shell 3 in the projected area in district of milling.
According to the utility model, can the molded line design data of ZGM95 type coal pulverizer is as follows:
Grinding roller maximum outside diameter Dg=(7/9) * D0=(7/9) * 1900=1477.78mm gets 1480mm, and wherein, the mill diameter of ZGM95 type coal pulverizer is 1900mm.
Grinding roller width B g=(1/3) Dg+50=(1/3) * 1480+50=543.33mm gets 540mm.
Half θ g=39 of grinding roller external arc central angle °.
Grinding roller outer arc radius Rg=(Bg/2)/Sin θ g=429mm gets 430mm.
Grinding roller external arc wall thickness dg=(1/15) Dg=98.7mm, get 100mm.
Lining board for grinding discs arc radius Rc=8/7Rg-10=481.43mm gets 480mm.
Liner plate center thickness δ c=0.05D0=95mm gets 97mm.
Liner plate outer width B cw=0.02D0=38mm gets 40mm.
After optimal design, for ZGM95 type coal pulverizer, the roller shell diameter is all in the situation of φ 1480, roller shell outer arc radius Rg becomes 430mm by 290mm, the width B g of roller shell is increased to 540mm by 490mm, liner plate arc radius Rc becomes 480mm by 333mm, and the cornerite of liner plate becomes 36.2 ° by original 54 °
In order to test effect of the present utility model, done a contrast test at certain 3A of power plant and 4E coal pulverizer, what the 3A coal pulverizer adopted is the molded line of milling of milling mechanism of the present utility model, the existing molded line of milling that the 4E coal pulverizer adopts, the correlation test situation is as follows:
Table one: 3A, 4E coal pulverizer EIAJ test parameters table
| Parameter name | Unit | The 3A mill | The 4E mill |
| Coal-supplying amount | t/h | 38.65 | 37.12 |
| The coal pulverizer electric current | A | 38.83 | 44.19 |
| Be grinding into a mouthful wind-warm syndrome | ℃ | 315.17 | 299.71 |
| Be grinding into a mouthful primary air pressure | kPa | 7.17 | 8.06 |
| Be grinding into a mouthful primary air flow | t/h | 70.98 | 57.80 |
| The disintegrating outlet temperature | ℃ | 71.87 | 73.18 |
| Sealing air/one time wind differential pressure | kPa | 6.96 | 7.04 |
| The cold-air flap aperture | % | 1.00 | 1.04 |
| The hot air disperser aperture | % | 34.77 | 65.52 |
| Hydraulic loaded power | MPa | 15.80 | 15.46 |
| Be folded to an aperture | % | 40 | 45 |
| Input power | kw | 297.99 | 353.81 |
| Fineness of pulverized coal R90 | % | 24.96 | 32.72 |
| The coal-grinding unit consumption | kw.h/t | 7.71 | 9.27 |
| Raw coal grindability HGI | - | 59 | 58 |
| Former moisture content of coal Mt | % | 14.70 | 15.70 |
| Coal ash Aar | % | 11.27 | 10.79 |
The test effect contrast is as follows:
1, pulverizer capacity comparison, 3A, the contrast of 4E pulverizer capacity are needed the coal pulverizer EIAJ is converted under same benchmark coal to compare, according to DL/T5145-2002 " thermal power plant pulverized coal preparation system designing and calculating technical stipulation ", benchmark coal coal data is: total moisture Mt=10%, As-received ash content Aar≤20%, Ha Shi grindability HGI=50, fineness of pulverized coal R90=20%.When this was tested, it is consistent that the wearing and tearing of setting grinding roller, the mill of 3A, 4E coal pulverizer affect level to pulverizer capacity, and raw coal size is basic identical, considers that mainly coal ash, moisture, grindability and fineness of pulverized coal are to the correction of pulverizer capacity.Coal pulverizer EIAJ ature of coal corrected Calculation process sees the following form:
Table two, coal pulverizer EIAJ ature of coal corrected Calculation table
By the calculating of above-mentioned table two as can be known, through revising to the benchmark coal, it is 34.82t/h that the molded line of milling of 3A coal pulverizer changes rear EIAJ, the 4E coal pulverizer is 31.45t/h, the 3A pulverizer capacity improves 10.7% than the 4E coal pulverizer, because the 3A coal pulverizer is finally exerted oneself and is subject to the 3A feeder, actual 3A grinds power and improves more than 10.7%.
2, coal-grinding unit consumption contrast, when 3A, the test of 4E coal pulverizer EIAJ, 3A coal pulverizer coal-supplying amount 38.65t/h, electric current 38.8A, hydraulic loaded power 15.8MPa, test fineness of pulverized coal R90=24.96%, coal-grinding unit consumption 7.71kw.h/t.During 4E coal pulverizer coal-supplying amount 38.15t/h, coal pulverizer electric current 44.2A, loading force 15.5MPa, test fineness of pulverized coal R90=32.72%, coal-grinding unit consumption 9.27kw.h/t is than the large 1.56kw.h/t of 3A mill coal-grinding unit consumption.
By above-mentioned result of the test, the molded line of milling of milling mechanism of the present utility model has improved the grinding efficiency of coal pulverizer, has increased milling of coal pulverizer and has exerted oneself, and has reduced the power consumption of milling of coal pulverizer, and is more energy-conservation for power plant.
In sum, the utility model is optimized design to the curvature of roller shell and liner plate, and the arc radius of roller shell and liner plate increases, and the molded line of roller shell and liner plate coordinates milder, more is conducive to the milling of material adapted to the variation of coal.Increased the width of roller shell, the projected area of milling of coal pulverizer has increased 10.2%, and the increase of projected area has improved the area of milling in the zone of milling, and has effectively improved the grinding efficiency of coal pulverizer.The design relatively of the cornerite of liner plate was in the past less, and the reducing of cornerite can reduce material cost for the liner plate design, more be conducive to grind simultaneously the needs of meager coal, was conducive to the smooth discharge that nothing such as gangue is beneficial to burning value material.The discharge of the pebble coals such as gangue has improved the grinding efficiency of coal pulverizer, has reduced the power consumption of milling of coal pulverizer.The molded line of milling of the present utility model more is applicable to present technique for overlaying, can adopt technique for overlaying to change the design of molded line after molded line is determined, applicable coal pulverizer needs the variation of coal.
As known by the technical knowledge, the utility model can be realized by other the embodiment that does not break away from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All in the utility model scope or the change that is being equal in scope of the present utility model all be included in the utility model.
Claims (3)
1. a coal pulverizer milling mechanism, comprise mill and grinding roller, is provided with liner plate on described mill, is arranged with roller shell on described grinding roller, and described roller shell and described liner plate butt is characterized in that, roller shell maximum outside diameter Dg=(7/9) * D
0, D
0Be the mill central diameter, the mm of unit;
Roller shell width B g=Dg/3+50, the mm of unit;
Half θ g=39 of roller shell external arc central angle °;
Roller shell outer arc radius Rg=(Bg/2)/Sin θ g, the mm of unit;
Roller shell external arc wall thickness dg=Dg/15, the mm of unit;
Liner plate arc radius Rc=8/7Rg-10, the mm of unit;
Liner plate center thickness δ c=0.05D
0, the mm of unit;
Liner plate outer width B cw=0.02D
0, the mm of unit;
The wrap angle sigma of liner plate is between 36 °～42 °.
2. a coal pulverizer, comprise milling mechanism, it is characterized in that, described milling mechanism is coal pulverizer milling mechanism claimed in claim 1.
3. coal pulverizer according to claim 2, is characterized in that, described coal pulverizer is medium-speed pulverizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579943 CN202942931U (en) | 2012-11-06 | 2012-11-06 | Coal mill and grinding mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220579943 CN202942931U (en) | 2012-11-06 | 2012-11-06 | Coal mill and grinding mechanism thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202942931U true CN202942931U (en) | 2013-05-22 |
Family
ID=48418647
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220579943 Expired - Lifetime CN202942931U (en) | 2012-11-06 | 2012-11-06 | Coal mill and grinding mechanism thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202942931U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567019A (en) * | 2013-11-12 | 2014-02-12 | 北京新源宝通电力设备有限公司 | Gradient grinding type HP (High Power) type coal mill |
| CN103769274A (en) * | 2014-02-20 | 2014-05-07 | 北京电力设备总厂 | Coal mill |
| CN103801431A (en) * | 2014-02-19 | 2014-05-21 | 北京电力设备总厂 | Medium-speed vertical mill for milling petroleum coke |
| CN103977863A (en) * | 2014-05-19 | 2014-08-13 | 江苏新业重工股份有限公司 | Novel millstone lining plate device of vertical mill |
| CN106475661A (en) * | 2016-11-08 | 2017-03-08 | 甘肃酒钢集团西部重工股份有限公司 | A kind of bead-welding technology of wear-resisting millstone sheet |
| CN106890705A (en) * | 2017-04-18 | 2017-06-27 | 长春发电设备总厂 | A kind of medium-speed pulverizer |
| CN112191331A (en) * | 2020-10-19 | 2021-01-08 | 上海谦淼工业科技有限公司 | Vertical mill with increase-volume and increase-efficiency structure |
| CN113154372A (en) * | 2021-04-09 | 2021-07-23 | 西安热工研究院有限公司 | Method for safely and efficiently co-burning bituminous coal in lignite boiler |
-
2012
- 2012-11-06 CN CN 201220579943 patent/CN202942931U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567019B (en) * | 2013-11-12 | 2016-07-20 | 北京新源宝通电力设备有限公司 | A kind of gradual change compaction type HP type coal pulverizer |
| CN103567019A (en) * | 2013-11-12 | 2014-02-12 | 北京新源宝通电力设备有限公司 | Gradient grinding type HP (High Power) type coal mill |
| CN103801431A (en) * | 2014-02-19 | 2014-05-21 | 北京电力设备总厂 | Medium-speed vertical mill for milling petroleum coke |
| CN103801431B (en) * | 2014-02-19 | 2015-12-09 | 北京电力设备总厂有限公司 | A kind of middling speed Vertical Mill being applied to grinding stone oil coke |
| CN103769274A (en) * | 2014-02-20 | 2014-05-07 | 北京电力设备总厂 | Coal mill |
| CN103769274B (en) * | 2014-02-20 | 2016-03-23 | 北京电力设备总厂有限公司 | A kind of coal pulverizer |
| CN103977863A (en) * | 2014-05-19 | 2014-08-13 | 江苏新业重工股份有限公司 | Novel millstone lining plate device of vertical mill |
| CN106475661A (en) * | 2016-11-08 | 2017-03-08 | 甘肃酒钢集团西部重工股份有限公司 | A kind of bead-welding technology of wear-resisting millstone sheet |
| CN106475661B (en) * | 2016-11-08 | 2019-02-19 | 甘肃酒钢集团西部重工股份有限公司 | A kind of bead-welding technology of wear-resisting millstone sheet |
| CN106890705A (en) * | 2017-04-18 | 2017-06-27 | 长春发电设备总厂 | A kind of medium-speed pulverizer |
| CN106890705B (en) * | 2017-04-18 | 2019-09-17 | 中国电建集团长春发电设备有限公司 | A kind of medium-speed pulverizer |
| CN112191331A (en) * | 2020-10-19 | 2021-01-08 | 上海谦淼工业科技有限公司 | Vertical mill with increase-volume and increase-efficiency structure |
| CN113154372A (en) * | 2021-04-09 | 2021-07-23 | 西安热工研究院有限公司 | Method for safely and efficiently co-burning bituminous coal in lignite boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING ELECTRIC POWER EQUIPMENT GENERAL FACTORY C Free format text: FORMER NAME: BEIJING POWER EQUIPMENT GENERAL PLANT |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 102401 Beijing City, Fangshan District Liangxiang Haotian Street No. 12 Patentee after: BEIJING POWER EQUIPMENT GROUP Co.,Ltd. Address before: 102401 Beijing City, Fangshan District Liangxiang Haotian Street No. 12 Patentee before: Beijing Power Equipment Group |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130522 |
|
| CX01 | Expiry of patent term |