CN202253714U - Pulverized coal mixer - Google Patents
Pulverized coal mixer Download PDFInfo
- Publication number
- CN202253714U CN202253714U CN 201120322307 CN201120322307U CN202253714U CN 202253714 U CN202253714 U CN 202253714U CN 201120322307 CN201120322307 CN 201120322307 CN 201120322307 U CN201120322307 U CN 201120322307U CN 202253714 U CN202253714 U CN 202253714U
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- China
- Prior art keywords
- concave surface
- airduct
- coal
- sinking tube
- powder sinking
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Abstract
The utility model discloses a pulverized coal mixer. The mixer comprises an air pipe and a powder falling pipe, wherein a concave surface is formed on the upper surface of the air pipe; the powder falling pipe is connected with the air pipe on the concave surface; at least one clapboard is arranged in the air pipe; the windward side of the concave surface is arc; the downwind side of the concave surface is arc or an inclined plane; and the powder falling pipe is arranged between the windward side and the downwind side. By the pulverized coal mixer, air flow in the air pipe is stable, and pulverized coal is uniformly mixed.
Description
Technical field
The present invention relates to a kind of device, particularly coal, pulverulent fuel mixer to the combustion apparatus fuel supplying.
Background technology
At present, warehouse chamber pulverized coal preparation system in the middle of the boiler of power plant great majority adopt, coal dust are sent into burner hearth burning by a wind airduct through coal, pulverulent fuel mixer, burner through machine supplying powder, powder sinking tube.Coal, pulverulent fuel mixer be used for mixed coal powder with the burning required air device.
In the prior art, be provided with a concave surface at the airduct upper surface of coal, pulverulent fuel mixer, concave surface is made up of the swash plate of both sides and the level board of concave bottom; When moving in the passage of air-flow below concave surface, the sectional area of passage is descending, and is ascending again; The unexpected variation of circulation area causes that the flow velocity of air-flow is undergone mutation, and makes the air-flow in the pipeline unstable; In pipe coal dust mix with air inhomogeneous, thereby can reduce the efficiency of combustion of the interior coal dust of burner hearth.
The utility model content
The purpose of the utility model is to overcome above shortcoming, and a kind of steady air current in the pipe, coal, pulverulent fuel mixer that coal dust mixes of making is provided.
The technical scheme of the utility model is:
A kind of coal, pulverulent fuel mixer; Comprise airduct, powder sinking tube, the upper surface of said airduct is provided with a concave surface, and powder sinking tube is connected at said concave surface place with airduct; Be provided with at least one dividing plate in the said airduct; The windward side of said concave surface is an arc, and the side with the wind of said concave surface is arc or tapered plane, and said windward side and said side with the wind are boundary with said powder sinking tube.
Further, the length of side with the wind of the windward side length of said concave surface and said concave surface is suitable.
Further, the windward side length of said concave surface is 5: 1 with the ratio of the A/F of said powder sinking tube.
Further, the angle of said powder sinking tube central axis and said airduct central axis is 35-55 °, and said angle is the angle of leaning on the windward side of concave surface.
Further, the minimum point of said concave surface to the distance of said airduct median plane be said dust diameter 0.2-0.3 doubly.
The coal, pulverulent fuel mixer that the utility model provides has following advantage:
1, steady air current mixes.The concave surface of airduct upper surface is an arc in the side of facining the wind, and a side is arc or tapered plane with the wind, and the sectional area of circulation passage is through dwindle gradually in the pipe; And then the process that enlarges gradually, the variation of sectional area is more level and smooth, and the flow velocity of air-flow also gradually changes; Thereby make variations in flow more stable, coal dust mixes more even after falling from powder sinking tube with air-flow; Stable air-flow can be brought coal dust in the burner hearth into continuously, guarantees that coal dust firing is abundant in the burner hearth.The variation of the interior actual internal area of pipe is level and smooth, has reduced the circulating resistance in the pipe, can effectively reduce the energy consumption that offers air-flow.
2, reinforcing band powder ability reduces the coal dust deposition.Through reducing the inclination angle of powder sinking tube, making it angle is 35-55 °, can guarantee that coal dust successfully falls from powder sinking tube; After getting into airduct, coal dust reduces in the speed of vertical direction under the effect of gravity and a general mood stream; Prolonged contacting and action time of wind and coal dust; Strengthened the band powder ability of a wind, made most coal dusts mix the back and get into the burner hearth burning, reduced coal dust deposition probability with a wind.
3, the negative pressure effect is obvious.The windward side length of concave surface is set to 5: 1 with the ratio of the A/F of powder sinking tube; The length of side with the wind of the windward side length of concave surface and concave surface is suitable, makes the horizontal length long enough of concave surface, thereby can in airduct, form negative pressure in long zone; The minimum point of concave surface to the distance of airduct median plane be dust diameter 0.2-0.3 doubly; Can make the interior negative pressure of pipe more remarkable, make coal dust brought into burner hearth by air-flow more easily, and reduced holder powder phenomenon.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment; To do briefly clearly to introduce to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the coal, pulverulent fuel mixer structural representation of the utility model embodiment 1;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the coal, pulverulent fuel mixer structural representation of the utility model embodiment 2;
Fig. 4 is the coal, pulverulent fuel mixer structural representation of the utility model embodiment 3;
Fig. 5 is the coal, pulverulent fuel mixer structural representation of the utility model embodiment 4;
Fig. 6 is the coal, pulverulent fuel mixer structural representation of the utility model embodiment 5;
Fig. 7 is the coal, pulverulent fuel mixer structural representation of the utility model embodiment 6;
Reference numeral: 1-airduct, 2-powder sinking tube, the windward side of 3-concave surface, the side with the wind of 4-concave surface, 5-dividing plate, the central axis of 6-powder sinking tube, the inclination angle of α-powder sinking tube.
The specific embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is a part of embodiment of the utility model, rather than whole embodiment.Based on the embodiment of the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The specific embodiment is following:
Referring to Fig. 1, Fig. 2, coal, pulverulent fuel mixer comprises airduct 1, powder sinking tube 2; The upper surface of airduct 1 is provided with a concave surface, the concave surface place that powder sinking tube 2 is installed airduct 1, and said concave surface is a boundary with powder sinking tube 2; The side with the wind 4 that is divided into the windward side 3 and the concave surface of concave surface; The windward side 3 of concave surface is an arc, and the side with the wind 4 of concave surface is a tapered plane, in airduct 1, is provided with a dividing plate 5.
The length of the length of the windward side 3 of concave surface and the side with the wind 4 of concave surface is suitable, and the length of the windward side 3 of concave surface is 5: 1 with the ratio of the A/F of powder sinking tube 2, makes the horizontal length long enough of concave surface, and the contraction of air-flow and expansion are more stable in the pipe.
The inclined angle alpha of powder sinking tube 2=35 °, inclined angle alpha are the central axis 6 of powder sinking tube and the angle of the central axis of airduct 1, and this angle is the angle of leaning on windward side.The inclination angle reduces, and after coal dust falls into airduct 1, under the effect of gravity and general mood stream, reduces in the speed of vertical direction, has prolonged contacting and action time of wind and coal dust, has strengthened the band powder ability of a wind, has reduced coal dust and has deposited probability.
In order to make the circulation path more than the dividing plate enough big, can below powder sinking tube 2 openings, form tangible negative pressure again, the minimum point of concave surface is made as 1/4 of dust diameter to the distance of airduct median plane.
Referring to Fig. 3, coal, pulverulent fuel mixer comprises airduct 1, powder sinking tube 2; The upper surface of airduct 1 is provided with a concave surface, the concave surface place that powder sinking tube 2 is installed airduct 1, and said concave surface is a boundary with powder sinking tube 2; The side with the wind 4 that is divided into the windward side 3 and the concave surface of concave surface; The windward side 3 of concave surface is an arc, and the side with the wind 4 of concave surface also is an arc, in airduct 1, is provided with two dividing plates 5.
The length of the length of the windward side 3 of concave surface and the side with the wind 4 of concave surface is suitable, and the length of the windward side 3 of concave surface is 5: 1 with the ratio of the A/F of powder sinking tube 2, makes the horizontal length long enough of concave surface, and the contraction of air-flow and expansion are more stable in the pipe.The A/F of powder sinking tube 2 is confirmed according to factors such as the caliber of airduct 1, coal dust demands.
Powder sinking tube is square, the inclined angle alpha of powder sinking tube 2=40 °, and inclined angle alpha is the central axis 6 of powder sinking tube and the angle of the central axis of airduct 1, this angle is the angle of leaning on windward side.The inclination angle reduces, and after coal dust falls into airduct 1, under the effect of gravity and general mood stream, reduces in the speed of vertical direction, has prolonged contacting and action time of wind and coal dust, has strengthened the band powder ability of a wind, has reduced coal dust and has deposited probability.
In order to make the circulation path more than the dividing plate enough big, can below powder sinking tube 2 openings, form tangible negative pressure again, the minimum point of concave surface is made as 0.2 times of dust diameter to the distance of airduct median plane.
Referring to Fig. 4, on the basis of embodiment 2, change the shape of the side with the wind 4 of concave surface into arc, the inclined angle alpha of powder sinking tube 2 changes α=50 ° into, and the minimum point of concave surface changes 0.3 times of dust diameter into to the distance of airduct median plane.
Two dividing plates 5 are distributed on the median plane of airduct.
Referring to Fig. 5, on the basis of embodiment 2, change the inclined angle alpha of powder sinking tube into α=45 °.The piece number of dividing plate 5 changes 3 into, and one of centre is arranged on the median plane of airduct, and all the other two it is identical with the A/F of powder sinking tube that back two spacing is set to below median plane, and preceding two spacing is set to 1/2 of powder sinking tube A/F.In like manner, the piece number of dividing plate can be set to 4 or more.
The minimum point of concave surface is made as 0.35 times of dust diameter to the distance of airduct median plane.
Referring to Fig. 6, on the basis of embodiment 2, change the inclination alpha of powder sinking tube into α=55 °; The position of two dividing plates 5 changes; First is arranged on below the airduct median plane, and second is arranged on the airduct median plane, and the minimum point of concave surface is made as 1/6 of dust diameter to the distance of airduct median plane.
Referring to Fig. 2, Fig. 7, coal, pulverulent fuel mixer comprises airduct 1, powder sinking tube 2, and the upper surface of airduct 1 is provided with a concave surface; The concave surface place that powder sinking tube 2 is installed airduct 1, concave surface is a boundary with powder sinking tube 2, is divided into the side with the wind 4 of the windward side 3 and the concave surface of concave surface; The windward side 3 of concave surface is an arc, and the side with the wind 4 of concave surface is an arc, and the arc length of windward side is longer than the arc length of side with the wind; Be about 1.5 times, the clearance opening direction that in airduct 1, is provided with two dividing plate 5, two dividing plates is identical with the opening direction of powder sinking tube 2; And the gap width of two dividing plates is suitable with the A/F of powder sinking tube, and being convenient to coal dust can fall along the gap of two dividing plates, reduces coal dust and drops on the amount on the dividing plate.
The inclined angle alpha of powder sinking tube is 60 °, and powder sinking tube 2 is a square structure, also can be cylindrical structural.
The minimum point of concave surface is 1/4 of a dust diameter to the distance of airduct median plane.
The coal, pulverulent fuel mixer that the utility model provides goes for mixing of other similar powders and air-flow.
Claims (5)
1. a coal, pulverulent fuel mixer comprises airduct, powder sinking tube, and the upper surface of said airduct is provided with a concave surface; Powder sinking tube is connected at said concave surface place with airduct; Be provided with at least one dividing plate in the said airduct, it is characterized in that, the windward side of said concave surface is an arc; The side with the wind of said concave surface is arc or tapered plane, and said windward side and said side with the wind are boundary with said powder sinking tube.
2. coal, pulverulent fuel mixer according to claim 1 is characterized in that, the length of side with the wind of the windward side length of said concave surface and said concave surface is suitable.
3. coal, pulverulent fuel mixer according to claim 2 is characterized in that, the windward side length of said concave surface is 5: 1 with the ratio of the A/F of said powder sinking tube.
4. coal, pulverulent fuel mixer according to claim 1 is characterized in that, the angle of said powder sinking tube central axis and said airduct central axis is 35-55 °, and said angle is the angle of leaning on the windward side of concave surface.
5. coal, pulverulent fuel mixer according to claim 4 is characterized in that, the minimum point of said concave surface to the distance of said airduct median plane be said dust diameter 0.2-0.3 doubly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120322307 CN202253714U (en) | 2011-08-30 | 2011-08-30 | Pulverized coal mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120322307 CN202253714U (en) | 2011-08-30 | 2011-08-30 | Pulverized coal mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202253714U true CN202253714U (en) | 2012-05-30 |
Family
ID=46114950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120322307 Expired - Fee Related CN202253714U (en) | 2011-08-30 | 2011-08-30 | Pulverized coal mixer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202253714U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854659A (en) * | 2016-04-08 | 2016-08-17 | 大唐安阳发电厂 | Air-conveying powdered coal mixer |
-
2011
- 2011-08-30 CN CN 201120322307 patent/CN202253714U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854659A (en) * | 2016-04-08 | 2016-08-17 | 大唐安阳发电厂 | Air-conveying powdered coal mixer |
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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: 20120530 Termination date: 20170830 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |