CN105618244A - Primary air flow mixing and equilibrating device for round air duct of coal mill inlet - Google Patents
Primary air flow mixing and equilibrating device for round air duct of coal mill inlet Download PDFInfo
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- CN105618244A CN105618244A CN201610151683.XA CN201610151683A CN105618244A CN 105618244 A CN105618244 A CN 105618244A CN 201610151683 A CN201610151683 A CN 201610151683A CN 105618244 A CN105618244 A CN 105618244A
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- air
- cold
- primary air
- coal pulverizer
- flow
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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
Abstract
The invention discloses a primary air flow mixing and equilibrating device for a round air duct of a coal mill inlet. The primary air flow mixing and equilibrating device comprises a hot primary air pipe, a cold primary air pipe, a cold primary air connector, a cold primary air uniform distributing device, a flow guide plate, a grating, a flow equalization plate and a coal mill connecting inlet. Cold primary air enters the hot primary air pipe through the cold primary air pipe, the cold primary air connector and the cold primary air uniform distributing device, and the cold primary air and hot primary air are mixed and then enter a coal mill through the flow guide plate, the grating, the flow equalization plate and the coal mill connecting inlet. The cold primary air connector is modified, the cold primary air uniform distributing device, the flow guide plate, the grating and the flow equalization plate are newly added, and therefore uniform distribution of a flow field and a temperature field on an air speed measurement element can be achieved, the measurement accuracy of air speed and temperature is improved, and finally the accurate coal mill inlet primary air volume is obtained.
Description
Technical field
The present invention relates to coal-burning power plant's coal pulverizer First air mixed flow and flow equalize technology field, particularly about a kind of the First air mixed flow and the current-sharing device that are applicable to coal-burning power plant's coal pulverizer inlet circular air channel.
Background technology
Along with the site layout project of large coal-fired power plant is more and more compacter, coal pulverizer inlet primary air measuring generally occurs that deviation is excessive, fluctuate the problem such as violent, seriously have impact on the oxynitride emission reduction effect of the economical operation of coal unit and low nitrogen burning device, has even there is safety issue in part of generating units.
Coal pulverizer inlet cold wind and the mixed speed of hot blast and temperature distributing disproportionation are even, are the basic reasons causing coal pulverizer inlet primary air measuring inaccurate. Compared with conventional rectangle air channel, circular air channel is usually more compact in spatial arrangement, and the mixed air flow method of cold and hot First air is more uneven, and easily forms eddy flow in measurement cross section, considerably increases the difficulty of primary air flow Measurement accuracy. A lot of spatial arrangement is limited, the hot and cold air channel of coal pulverizer inlet is the unit of circular air channel, all there is the problem that primary air measuring is inaccurate.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provide a kind of solve coal pulverizer inlet circular air channel a cold wind and a hot blast mixing after the mixed flow of speed and the even problem of temperature distributing disproportionation and current-sharing device.
For this reason, the present invention provides First air mixed flow and the current-sharing device of a kind of coal pulverizer inlet circular air channel, comprises heat primary air pipe, cold primary air piping, cold First air interface, cold First air uniform device, flow deflector, grid, homogenizing plate and coal pulverizer access port.
The cross section of described cold First air interface for gradually expanding variable cross-section, its by rounded section gradually transition be square-section; The rounded section place end of described cold First air interface is connected with cold primary air piping, the circumference face welded seal of place, square-section end and heat primary air pipe.
Described cold First air uniform device is connected with cold First air interface by the circumference face perforate of heat primary air pipe.
Cold First air enters heat primary air pipe by cold primary air piping, cold First air interface and cold First air uniform device, and hot and cold First air enters coal pulverizer through flow deflector, grid, homogenizing plate and coal pulverizer access port after mixing.
Further, described cold First air uniform device comprises bellows dividing plate, end face remained silent by bellows, air compartment baffle and vane static mixer.
Described cold First air uniform device forms multiple independent bellows by bellows dividing plate and bellows end face of remaining silent, and each bellows all form some little air compartments by air compartment baffle, and vane static mixer is welded in the outlet of each little air compartment.
Preferably, described bellows end face of remaining silent is arc plate or symmetrical flap.
Preferably, described flow deflector is for being become by outer thin layout close in the concentric flow deflector of polylith.
The First air mixed flow of described coal pulverizer inlet circular air channel provided by the invention and current-sharing device are on the basis in the original circular air channel of coal-burning power plant's coal pulverizer inlet, by the transformation to cold First air interface, newly-increased cold First air uniform device, flow deflector, grid and homogenizing plate, being uniformly distributed of measuring wind speed element place's Flow and heat flux can be realized, improve the accuracy of wind speed and temperature survey, finally obtain coal pulverizer inlet primary air flow accurately.
Accompanying drawing explanation
Fig. 1 is the First air mixed flow of a kind of coal pulverizer inlet circular air channel provided by the invention and the one-piece construction schematic diagram of current-sharing device;
Fig. 2 is the structural representation of cold First air uniform device in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
Refer to Fig. 1, the present invention provides First air mixed flow and the current-sharing device of a kind of coal pulverizer inlet circular air channel, comprises heat primary air pipe 1, cold primary air piping 2, cold First air interface 3, cold First air uniform device 4, flow deflector 5, grid 6, homogenizing plate 7 and coal pulverizer access port 8.
The cross section of described cold First air interface 3 for gradually expanding variable cross-section, its by rounded section gradually transition be square-section; The rounded section place end of described cold First air interface 3 is connected with cold primary air piping 2, the circumference face welded seal of place, square-section end and heat primary air pipe 1.
Described cold First air uniform device 4 is connected with cold First air interface 3 by the circumference face perforate of heat primary air pipe 1.
Cold First air enters heat primary air pipe 1 by cold primary air piping 2, cold First air interface 3 and cold First air uniform device 4, and hot and cold First air enters coal pulverizer through flow deflector 5, grid 6, homogenizing plate 7 and coal pulverizer access port 8 after mixing.
Referring to Fig. 2, described cold First air uniform device 4 comprises bellows dividing plate 9, end face 10 remained silent by bellows, air compartment baffle 11 and vane static mixer 12. And, described cold First air uniform device 4 forms multiple independent bellows by bellows dividing plate 9 and bellows end face 10 of remaining silent, and each bellows all form some little air compartments by air compartment baffle 11, and vane static mixer 12 is welded in the outlet of each little air compartment.
Described bellows remain silent end face 10 for arc plate or symmetrical flap.
Described flow deflector 5 is for being become by outer thin layout close in the concentric flow deflector of polylith.
On the First air mixed flow of described coal pulverizer inlet circular air channel provided by the invention and the current-sharing device basis on the original circular air channel of coal-burning power plant's coal pulverizer inlet, by to the transformation of cold First air interface and newly-increased cold First air uniform device, achieve uniform in heat primary air pipe of cold First air, and enhance the mixing of cold First air and heat primary air; By arranging flow deflector in elbow, it is possible to mixed air-flow plays guiding and drag reduction effect effectively, part compensate for the resistance caused by newly-increased cold First air uniform device to be increased; Owing to the air-flow in circular air channel easily rotates, it is provided with grid in a distance, measuring wind speed element (not shown) upstream, make air-flow by air flow line after grid just to measuring wind speed element, to the requirement in speed of incoming flow direction when meeting measuring wind speed element normal operation; Homogenizing plate is arranged between grid and measuring wind speed element, can improve the homogeneity in flow field, measuring wind speed element place; By temperature survey element (not shown) being arranged in coal pulverizer access port upstream vicinity position, can further improve the accuracy of temperature survey, finally obtaining coal pulverizer inlet primary air flow accurately.
The above; it is only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; any it is familiar with those skilled in the art in the technical scope that the present invention discloses; technical scheme and invention design thereof according to the present invention are equal to replacement or are changed, and all should be encompassed within protection scope of the present invention.
Claims (5)
1. the First air mixed flow of a coal pulverizer inlet circular air channel and current-sharing device, it is characterised in that: comprise heat primary air pipe, cold primary air piping, cold First air interface, cold First air uniform device, flow deflector, grid, homogenizing plate and coal pulverizer access port, wherein:
The cross section of described cold First air interface for gradually expanding variable cross-section, its by rounded section gradually transition be square-section; The rounded section place end of described cold First air interface is connected with cold primary air piping, the circumference face welded seal of place, square-section end and heat primary air pipe;
Described cold First air uniform device is connected with cold First air interface by the circumference face perforate of heat primary air pipe;
Cold First air enters heat primary air pipe by cold primary air piping, cold First air interface and cold First air uniform device, and hot and cold First air enters coal pulverizer through flow deflector, grid, homogenizing plate and coal pulverizer access port after mixing.
2. the First air mixed flow of a kind of coal pulverizer inlet circular air channel according to claim 1 and current-sharing device, it is characterised in that, described cold First air uniform device comprises bellows dividing plate, end face remained silent by bellows, air compartment baffle and vane static mixer.
3. the First air mixed flow of a kind of coal pulverizer inlet circular air channel according to claim 2 and current-sharing device, it is characterized in that, described cold First air uniform device forms multiple independent bellows by bellows dividing plate and bellows end face of remaining silent, each bellows all form some little air compartments by air compartment baffle, and vane static mixer is welded in the outlet of each little air compartment.
4. the First air mixed flow of a kind of coal pulverizer inlet circular air channel according to claim 2 and current-sharing device, it is characterised in that, described bellows end face of remaining silent is arc plate or symmetrical flap.
5. the First air mixed flow of a kind of coal pulverizer inlet circular air channel according to claim 1 and current-sharing are put, it is characterised in that, described flow deflector is for being become by outer thin layout close in the concentric flow deflector of polylith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610151683.XA CN105618244A (en) | 2016-03-17 | 2016-03-17 | Primary air flow mixing and equilibrating device for round air duct of coal mill inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610151683.XA CN105618244A (en) | 2016-03-17 | 2016-03-17 | Primary air flow mixing and equilibrating device for round air duct of coal mill inlet |
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| CN105618244A true CN105618244A (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610151683.XA Pending CN105618244A (en) | 2016-03-17 | 2016-03-17 | Primary air flow mixing and equilibrating device for round air duct of coal mill inlet |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110013909A (en) * | 2019-05-22 | 2019-07-16 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal pulverizer inlet cold-hot wind mixing arrangement |
| CN110487695A (en) * | 2019-07-08 | 2019-11-22 | 佛山市顺德区阿波罗环保器材有限公司 | Strainability detection system of fume filtering element |
| CN110514569A (en) * | 2019-07-08 | 2019-11-29 | 佛山市顺德区阿波罗环保器材有限公司 | The ducting assembly of strainability detection system of fume filtering element |
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
| CN113275117A (en) * | 2021-05-21 | 2021-08-20 | 京仪股份有限公司 | Primary air flow field adjusting structure based on flow equalizing technology |
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| CN205435977U (en) * | 2016-03-17 | 2016-08-10 | 苏州西热节能环保技术有限公司 | Wind mixed flow and flow straightener in circular wind channel of coal pulverizer entry |
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| JP2001058137A (en) * | 1999-08-24 | 2001-03-06 | Babcock Hitachi Kk | Boiler apparatus |
| CN1687640A (en) * | 2005-03-24 | 2005-10-26 | 华中科技大学 | Main burner equipment with outer rotational flow and inner direct flow |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110013909A (en) * | 2019-05-22 | 2019-07-16 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal pulverizer inlet cold-hot wind mixing arrangement |
| CN110013909B (en) * | 2019-05-22 | 2024-03-08 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Cold and hot air mixing device for coal mill inlet |
| CN110487695A (en) * | 2019-07-08 | 2019-11-22 | 佛山市顺德区阿波罗环保器材有限公司 | Strainability detection system of fume filtering element |
| CN110514569A (en) * | 2019-07-08 | 2019-11-29 | 佛山市顺德区阿波罗环保器材有限公司 | The ducting assembly of strainability detection system of fume filtering element |
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
| CN113275117A (en) * | 2021-05-21 | 2021-08-20 | 京仪股份有限公司 | Primary air flow field adjusting structure based on flow equalizing technology |
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Application publication date: 20160601 |
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