CN203990771U - A kind of intermediate-speed bowl mill - Google Patents
A kind of intermediate-speed bowl mill Download PDFInfo
- Publication number
- CN203990771U CN203990771U CN201420369907.0U CN201420369907U CN203990771U CN 203990771 U CN203990771 U CN 203990771U CN 201420369907 U CN201420369907 U CN 201420369907U CN 203990771 U CN203990771 U CN 203990771U
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- bull ring
- coal
- mill
- bowl
- ring
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Abstract
The utility model provides a kind of intermediate-speed bowl mill to comprise: machine body, a wind entrance, separator, mill bowl and grinding roller, and the first bull ring being connected with mill bowl; It is characterized in that, also comprise the second bull ring being connected with the first bull ring.The capacity that can increase like this mill bowl, can mill raw coal more fully, and the eliminating amount of pebble coal lowers greatly, improves the efficiency of coal pulverizer.
Description
Technical field
The utility model relates to a kind of technical field of coal pulverizer, relates in particular to a kind of intermediate-speed bowl mill.
Background technology
Coal pulverizer is by coal crusher and wears into the machinery of coal dust, and it is the important auxiliary equipment of coal-powder boiler.According to coal-grinding speed, conventionally can be divided three classes: low-speed coal mill, medium-speed pulverizer and high speed coal mill.
As shown in Figure 1, be conventional intermediate-speed bowl mill in a kind of thermal power plant of the prior art.This coal pulverizer 100 comprises: the top cover 103 of coal spout 101, drain 102, separator, separator 104, impeller unit 105, reduction box 106, pebble coal outlet 107, wind entrance 108, mill bowl 109, side body 110, three equally distributed in a circumferential direction grinding rollers 111, elasticity charger 112, interior centrum 113, venturi tubes 114, be folded to an adjusting device 115, coal export 116.The operation principle of this coal pulverizer 100 is: raw coal enters into the bull ring of mill bowl 109 from coal spout 101, bull ring is transported to raw coal to mill on track by means of centrifugal force, 112 pairs of grinding rollers 111 of elasticity charger apply the power of milling, and by the rotation between grinding roller 111 and mill bowl 109, raw coal are pulverized; Simultaneously also can be to coal be dried, particularly, a wind entrance 108 of side body 110 enters around bull ring equably by nozzle ring, the separator 104 on coal pulverizer top is dried and be delivered to the coal mixture tangentially throwing away from bull ring milling, be difficult to shatter heavier pebble coal that device and a wind do not rise etc. and fall the dreg discharging box of an air compartment below by nozzle ring, pebble coal 107 outlets, finally with scraper plate, hang up.
Inventor is realizing process discovery of the present utility model, and above-mentioned coal pulverizer exists some problems: 1, coal pulverizer coal-grinding efficiency is low, and pebble coal amount is large, and in pebble coal, contains raw coal; 2, in air compartment, pebble coal is deposited when serious, if artificial, does not get rid of in time, and the scraper plate that pebble coal is rotated is pushed into air channel one time, and the circulation area in air channel will reduce, and causes that primary air flow is not enough, the decline of exerting oneself.
Utility model content
In order to solve the above-mentioned technical problem existing in coal pulverizer in prior art, the utility model provides the intermediate-speed bowl mill that a kind of coal-grinding efficiency is high, reduce pebble coal amount.
A kind of intermediate-speed bowl mill that the utility model provides comprises: machine body, a wind entrance, separator, mill bowl and grinding roller, and the first bull ring being connected with mill bowl; It is characterized in that, also comprise the second bull ring being connected with the first bull ring.
Preferably, the height of aspect ratio first bull ring of above-mentioned the second bull ring is high.
Preferably, the height of above-mentioned the second bull ring is 100mm, than the height of described the first bull ring, exceeds 60mm.
Preferably, the thickness of above-mentioned the second bull ring is 10nm.
Preferably, the girth of above-mentioned the second bull ring is 10400mm.
Preferably, above-mentioned the second bull ring is made by wear-resisting steel plate.
Preferably, above-mentioned intermediate-speed bowl mill, is characterized in that, also comprises air throttle ring, and the impeller nozzle between described the second bull ring and described air throttle ring.
After adopting technique scheme, can increase the capacity of mill bowl, raw coal can be milled more fully, the eliminating amount of pebble coal lowers greatly, improves the efficiency of coal pulverizer.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of coal pulverizer of the prior art;
Figure 2 shows that the partial schematic diagram of a kind of intermediate-speed bowl mill that the utility model embodiment relates to;
Figure 3 shows that a kind of intermediate-speed bowl mill that the utility model embodiment relates to is at the partial schematic diagram at another visual angle.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail, it should be noted that, these specific descriptions just allow those of ordinary skills be more prone to, clearly understand the utility model, but not to limited explanation of the present utility model.
Embodiment
As shown in Figure 2, preferably, a kind of coal pulverizer that the present embodiment provides is mainly on coal pulverizer, to improve in Fig. 1, main improvement is: provide a kind of intermediate-speed bowl mill to comprise: machine body, a wind entrance, separator, mill bowl 1 and grinding roller, and the first bull ring 2 being connected with mill bowl; Also comprise the second bull ring 3 being connected with the first bull ring 2.And the height of aspect ratio first bull ring 2 of the second bull ring 3 is high.
Preferably, the parameter of the second bull ring 3 is as follows: be highly 100mm, than the height of described the first bull ring exceed 60mm, thickness is that 10nm, girth are 10400mm.Other parameters are: the present embodiment provides the dischargeable capacity of mill bowl to increase about 0.44m; As temperature, it is 285 ℃; Extended loop place wind speed is 55-60m/s.
Preferably, above-mentioned the second bull ring 3 is made by wear-resisting steel plate; Every coal pulverizer needs 1m2 left and right.In each overhaul life (6000h), only need the second bull ring 3 of mill bowl 1 to change like this, and needn't change former mill bowl extended loop (the first bull ring 2), the replacement cycle of former mill bowl extended loop is brought up to 3 overhaul lifes by 1 overhaul life.
As described in Fig. 2, Fig. 3, preferably, a kind of coal pulverizer that the present embodiment provides also comprises air throttle ring 4, and air throttle ring 4 is connected with the shell of rotary blade 5; Impeller nozzle 7 between the second bull ring 3 and air throttle ring 4; And the wind speed collector plate 6 that is positioned at impeller nozzle; The second bull ring 3 is also connected with air throttle ring 4 by vane 8.
Preferably, the second bull ring 3 is welded on the side of the first bull ring 2, and the second bull ring 3 is enough to enclose full the first bull ring 2, and the mode by welding can be so that the second bull ring 3 comes off in running, thereby avoids coal pulverizer stoppage in transit accident.
| Project | Before enforcement | After enforcement | Remarks |
| Pebble coal ash-retention efficiency | About > 1.2% | Approximately 0.65% | Qualitative rough contrast |
| Be grinding into the consumption of one's intention as revealed in what one says amount | 46t/h | 40t/h | 35t/h coal-supplying amount |
| Motor of coal crusher electric current | 39A | 37A | 35t/h coal-supplying amount |
| The pebble coal deslagging cycle | 0.5h | 1.5h | 35t/h coal-supplying amount |
| Deslagging fine powder content | Many | Seldom | 35t/h coal-supplying amount |
| Mill bowl pressure reduction | 4.5kPa | 7.0-7.5kPa | 35t/h coal-supplying amount |
| Impeller nozzle place effective wind speed | 45～50m/s | 55-60m/s | 25-35t/h coal-supplying amount |
| Slag is blocked up in entrance air channel | Often occur | Do not occur | 30-35t/h coal-supplying amount |
| One time air compartment catches fire | Regularly occur | Do not occur | 30-35t/h coal-supplying amount |
| The mill bowl extended loop replacement cycle | 6000h | 18000h | Average 30t/h coal-supplying amount |
Table 2. coal pulverizer increases after the second bull ring and parameter comparison before
The beneficial effect that the technical scheme that the present embodiment adopts as can be seen from Table 2 can be brought comprises: 1, coal pulverizer stone bed drain purge amount is down to below 0.65% by original 1.2% left and right, in pebble coal almost without raw coal, improve greatly exerting oneself of coal pulverizer, reduced production cost.2, adopt after the scheme that this enforcement provides, because coal pulverizer pebble coal amount reduces, effectively avoided air compartment and air channel Ignition Phenomena, there is not air compartment and air channel Ignition Phenomena for 2 years so far in the coal pulverizer that the present embodiment provides, coking phenomenon does not occur.3, pebble coal discharge capacity reduces, and the cycle of clapping pebble coal lengthens, and has greatly reduced stone coal discharge personnel's workload, only needs 4-6 name row pebble coal personnel during duplex running.
Finally it should be noted that, above-mentioned explanation is only most preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction.Any those of ordinary skill in the art; do not departing within the scope of technical solutions of the utility model; all can utilize way and the technology contents of above-mentioned announcement to make many possible changes and simple replacement etc. to technical solutions of the utility model, these all belong to the scope of technical solutions of the utility model protection.
Claims (8)
1. an intermediate-speed bowl mill, comprising: machine body, a wind entrance, separator, mill bowl and grinding roller, and the first bull ring being connected with mill bowl; It is characterized in that, also comprise the second bull ring being connected with the first bull ring.
2. a kind of intermediate-speed bowl mill as claimed in claim 1, is characterized in that, the height of aspect ratio first bull ring of described the second bull ring is high.
3. a kind of intermediate-speed bowl mill as claimed in claim 2, is characterized in that, the height of described the second bull ring is 100mm, than the height of described the first bull ring, exceeds 60mm.
4. a kind of intermediate-speed bowl mill as claimed in claim 2, is characterized in that, the thickness of described the second bull ring is 10nm.
5. a kind of intermediate-speed bowl mill as claimed in claim 2, is characterized in that, the girth of described the second bull ring is 10400mm.
6. a kind of intermediate-speed bowl mill as described in as arbitrary in claim 1～5, is characterized in that, described the second bull ring is made by wear-resisting steel plate.
7. a kind of intermediate-speed bowl mill as claimed in claim 1, is characterized in that, also comprises air throttle ring, and the impeller nozzle between described the second bull ring and described air throttle ring.
8. a kind of intermediate-speed bowl mill as claimed in claim 1, is characterized in that, described the second bull ring is welded on the side of described the first bull ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420369907.0U CN203990771U (en) | 2014-07-03 | 2014-07-03 | A kind of intermediate-speed bowl mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420369907.0U CN203990771U (en) | 2014-07-03 | 2014-07-03 | A kind of intermediate-speed bowl mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203990771U true CN203990771U (en) | 2014-12-10 |
Family
ID=52030841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420369907.0U Expired - Fee Related CN203990771U (en) | 2014-07-03 | 2014-07-03 | A kind of intermediate-speed bowl mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203990771U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105833946A (en) * | 2016-04-27 | 2016-08-10 | 江苏方天电力技术有限公司 | Medium-speed coal mill with novel grinding bowl structure |
-
2014
- 2014-07-03 CN CN201420369907.0U patent/CN203990771U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105833946A (en) * | 2016-04-27 | 2016-08-10 | 江苏方天电力技术有限公司 | Medium-speed coal mill with novel grinding bowl structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20150703 |
|
| EXPY | Termination of patent right or utility model |