CN203598912U - Inlet air duct for coal mill - Google Patents
Inlet air duct for coal mill Download PDFInfo
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- CN203598912U CN203598912U CN201320695217.XU CN201320695217U CN203598912U CN 203598912 U CN203598912 U CN 203598912U CN 201320695217 U CN201320695217 U CN 201320695217U CN 203598912 U CN203598912 U CN 203598912U
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- air duct
- coal
- air channel
- deflector
- inlet
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Abstract
The utility model relates to an inlet air duct for a coal mill. The inlet air duct comprises a primary air duct, wherein the primary air duct is provided with a plurality of first guide plates which are arranged at certain intervals at an inlet segment in front of a scraper chamber of the coal mill; the rotating direction of a scraper in the scraper chamber is accordant with the guiding directions of the first guide plates; a dead corner formed at the inlet segment of the primary air duct in a direction opposite to the rotating direction of the scraper is enclosed by arranging second guide plates and a plurality of steel plates assembled together with the second guide plates; and the guiding directions of the second guide plates are accordant with those of the first guide plates. By adopting the inlet air duct, the phenomenon of burnout of the inlet air duct of the coal mill due to piling and spontaneous combustion of pebble coal at the inlet of the air duct can be avoided effectively. The inlet air duct for the coal mill has the advantages of small investment on reconstruction, easiness in construction, quick response and great benefit.
Description
Technical field
The utility model relates to the field of boiler coal-ash preparation system, particularly a kind of coal pulverizer inlet air channel.
Background technology
Current coal supply anxiety, power plant's power ature of coal is difficult to be fundamentally improved in a short time, and for reducing costs, fire coal is mixed and is burnt till as inevitable.Pulverized coal preparation system is coal-fired unit direct-firing, configuration medium-speed pulverizer, and in the time using the higher coal of fugitive constituent, Ignition Phenomena easily burns in coal pulverizer inlet air channel.
For example, certain boiler milling system is direct-firing, 6 respectively corresponding 6 HP-1003/Dyn intermediate-speed bowl mills of belt coal feeder; Use when design coal 5 use 1 for subsequent use, use while checking coal 6 all to come into operation.On every coal pulverizer, there are four airducts that qualified coal dust is delivered to burner hearth four walls, an airduct of drawing on A, B, C, D, E, F mill A, B, C, D, E, the F layer of corresponding burner hearth respectively; An airduct temperature design of coal pulverizer outlet is 76-90 ℃.But in the time using the higher coal of fugitive constituent, not in time, pebble coal is easily piled up and spontaneous combustion at coal pulverizer inlet air channel place, scaling loss coal pulverizer inlet air channel for as large in pebble coal amount and discharge.
Find by analysis, as shown in Figure 1, air channel 1 of coal pulverizer is designed with some spaced apart deflectors 3 entering before coal pulverizer scraper plate chamber 2, the direction (shown in arrow 4) that scraper plate rotates is consistent with the guiding of deflector 3, but the opposite direction of rotating at air channel entrance scraper plate can form dead angle 5.When using the coal that fugitive constituent is higher, and pebble coal amount is when large, and pebble coal enters dead angle 5 under the effect of scraper plate, along with the increase of accumulating amount, as now primary air flow is relatively little, pebble coal will enter an air channel and deposit, and then generation spontaneous combustion, air channel entrance of scaling loss coal pulverizer.
Utility model content
The purpose of this utility model is to provide a kind of coal pulverizer inlet air channel, by local flow improvement is carried out in an air channel, avoid occurring betiding in the time using the higher coal of fugitive constituent the burning Ignition Phenomena in coal pulverizer inlet air channel, being particularly useful for pulverized coal preparation system is coal-fired unit direct-firing, configuration medium-speed pulverizer.
In order to achieve the above object, the technical solution of the utility model is to provide a kind of coal pulverizer inlet air channel, it comprises air channel one time, this air channel is at the entrance entering before the scraper plate chamber of coal pulverizer, be provided with some spaced apart the first deflectors, the direction that the indoor scraper plate of described scraper plate rotates is consistent with the guiding of described the first deflector; By the second deflector and some steel plates of assembling are with it set, by be in an air channel this entrance, be formed at scraper plate and rotate the sealing of reciprocal dead angle; The guiding of described the second deflector is consistent with the guiding of described the first deflector.
Preferably, all shut along short transverse assembled the second deflector and steel plate at described dead angle.
Preferably, the distance between described the second deflector and with it adjacent the first deflector, and spacing between any two adjacent the first deflectors is identical or different.
Preferably, the thickness δ=5mm of described steel plate, or δ=10mm.
Compared with prior art, the advantage in coal pulverizer inlet described in the utility model air channel is, by a newly-increased deflector and the steel plate of assembly and connection with it, porch, air channel is formed to scraper plate and rotates the sealing of reciprocal dead angle, thereby avoid pebble coal etc. to pile up spontaneous combustion and the phenomenon in scaling loss coal pulverizer inlet air channel occurs at air channel entrance.Less investment, easily construction, instant effect, the income of the utility model to coal pulverizer inlet transformation of air duct is large.
Accompanying drawing explanation
Fig. 1 is the structural representation in existing coal pulverizer inlet air channel;
Fig. 2 is the structural representation in coal pulverizer inlet described in the utility model air channel.
The specific embodiment
As shown in Figure 2, the utility model provides a kind of coal pulverizer inlet air channel, wherein air channel 1 is designed with several spaced apart the first deflectors 31 entering before coal pulverizer scraper plate chamber 2, and the direction (shown in arrow 4) that scraper plate chamber 2 inside strakes rotate is consistent with the guiding of these the first deflectors 31.In the utility model, pass through the some steel plates 6 of assembling and a second newly-increased deflector 32, to be in air channel entrance, and be formed at scraper plate and rotate reciprocal dead angle sealing (sealing place is expressed as to 7), thereby using the coal that fugitive constituent is higher, for example, when pebble coal, fire coal is not easy to pile up in 1 porch, air channel of coal pulverizer, thereby avoids occurring the phenomenon in spontaneous combustion scaling loss coal pulverizer inlet air channel.
Specifically, the second newly-increased deflector 32 is just arranged at the dead angle place of air channel 1 entrance of coal pulverizer, and its guiding is consistent with the guiding of other the first deflectors 31.In different application examples, the distance between the second deflector 32 and with it adjacent the first deflector 31, and spacing between any two adjacent the first deflectors 31 is identical or different.
Except described the second deflector 32, remaining some steel plate 6(thickness δ=5mm for dead angle area, or δ=10mm) shut, reflux to eliminate a wind, and stop pebble coal to be piled up at this.When construction, dead angle will all be shut along short transverse, and the necessary full weld of weld seam, prevents that coal dust from entering the confined space inside of shutting, and causes spontaneous combustion of pulverized coal.
It is coal-fired unit direct-firing, configuration medium-speed pulverizer that the utility model is particularly useful for pulverized coal preparation system.Transformation can utilize while stopping mill maintenance and implement, and also can in the time of unit maintenance, carry out.Less investment, easily construction, instant effect, the income of the utility model to coal pulverizer inlet transformation of air duct is large.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.Read after foregoing those skilled in the art, for multiple modification of the present utility model and substitute will be all apparent.Therefore, protection domain of the present utility model should be limited to the appended claims.
Claims (4)
1. a coal pulverizer inlet air channel, it is characterized in that, comprise an air channel (1), this air channel (1) is entering the front entrance in scraper plate chamber (2) of coal pulverizer, be provided with some spaced apart the first deflectors (31), the direction that described scraper plate chamber (2) inside strake rotates is consistent with the guiding of described the first deflector (31); By the second deflector (32) and some steel plates (6) of assembling are with it set, by be in an air channel (1) this entrance, be formed at scraper plate and rotate the sealing of reciprocal dead angle; The guiding of described the second deflector (32) is consistent with the guiding of described the first deflector (31).
2. coal pulverizer inlet as claimed in claim 1 air channel, is characterized in that,
All shut along assembled the second deflector (32) of short transverse and steel plate (6) at described dead angle.
3. coal pulverizer inlet as claimed in claim 1 air channel, is characterized in that,
Distance between described the second deflector (32) and with it adjacent the first deflector (31), and spacing between any two adjacent the first deflectors (31) is identical or different.
4. coal pulverizer inlet as claimed in claim 1 air channel, is characterized in that,
Thickness δ=the 5mm of described steel plate (6), or δ=10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320695217.XU CN203598912U (en) | 2013-11-06 | 2013-11-06 | Inlet air duct for coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320695217.XU CN203598912U (en) | 2013-11-06 | 2013-11-06 | Inlet air duct for coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203598912U true CN203598912U (en) | 2014-05-21 |
Family
ID=50711613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320695217.XU Expired - Fee Related CN203598912U (en) | 2013-11-06 | 2013-11-06 | Inlet air duct for coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203598912U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394231A (en) * | 2019-07-19 | 2019-11-01 | 国家能源集团宁夏煤业有限责任公司 | Coal pulverizer |
-
2013
- 2013-11-06 CN CN201320695217.XU patent/CN203598912U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394231A (en) * | 2019-07-19 | 2019-11-01 | 国家能源集团宁夏煤业有限责任公司 | Coal pulverizer |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20211106 |