CN101571290B - Wind-powder mixer with unhindered powder supply - Google Patents
Wind-powder mixer with unhindered powder supply Download PDFInfo
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- CN101571290B CN101571290B CN2009100747292A CN200910074729A CN101571290B CN 101571290 B CN101571290 B CN 101571290B CN 2009100747292 A CN2009100747292 A CN 2009100747292A CN 200910074729 A CN200910074729 A CN 200910074729A CN 101571290 B CN101571290 B CN 101571290B
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Abstract
The invention provides a wind-powder mixer with unhindered powder supply, which is used for solving the problem of positive pressure powder support. The invention has the following technical proposals: the wind-powder mixer comprises a coal shoot, a body, an upper support plate, a lower support plate, a front tongue plate, a rear tongue plate and a square plate, wherein, the coal shoot is positioned on the top of the square plate; the upper support plate and the lower support plate are positioned in the body. After being improved, the mixer is additionally provided with a guide plate which is positioned at the outlet of the coal shoot; the front working surface of the guide plate is arranged along the extension line of the front tongue plate; the back working surface is arranged along the extension line of the front wall of the coal shoot; a throat opening is formed between the lower end of the guide plate and the upper support plate. Due to the arrangement of the guide plate, the throat opening is formed between the bottom of the guide plate and the upper support plate, the high-velocity airflow pumps coal powder, so the spaces in the throat opening and the coal shoot are always in a negative pressure state, thereby efficiently eliminating the powder support phenomenon. The invention has the advantages of simple structure, low manufacturing cost, easy implementation and obvious effect.
Description
Technical field
The present invention relates to a kind of device, particularly be provided with the double bracket plate air and powder mixer of deflector, belong to the combustion apparatus technical field to the combustion apparatus fuel supplying.
Background technology
At present, the station boiler overwhelming majority adopts bin storage type pulverizing system, and coal dust is sent into burner hearth burning by a wind airduct through air and powder mixer, burner by machine supplying powder, coal spout.Air and powder mixer be used in the pulverized-coal fired boiler mixed coal powder and the burning required air wind powder mixing arrangement, its main type has single mount plate air and powder mixer, double bracket plate air and powder mixer and venturi air and powder mixer.Large-sized boiler generally adopts single mount plate air and powder mixer or double bracket plate air and powder mixer, comprise coal spout, body, supporting plate, hyoplastron, square plate etc. in its main composition, its mixing mechanism is when a general mood flows by reducing, because swabbing action, form negative pressure in reducing place, the coal dust that falls in the coal spout is entered coal, pulverulent fuel mixer by the air-flow suction.In order to guarantee boiler safety, economy, operation stably, require continuously, evenly to give powder to the powder device.But in the boiler actual motion, the air and powder mixer of this ordinary construction is under the changeable situation of coal, easily in pipeline, produce malleation holder powder, smooth, the phenomenons such as powder delivery even disconnected powder of pulsing of powder down appear, at this moment show as " bulk coal dust " at burner nozzle and inject burner hearth or " disconnected powder ", cause the boiler operating parameter instability, when serious, be forced to load down in the short time, influenced the economy and the security of boiler operatiopn.Because power plant's coal is changeable, and ature of coal is relatively poor, the stifled powder phenomenon of the frequent generation of boiler for preventing that often oily combustion-supporting measure is thrown in employing because of disconnected powder causes flame-out blowing out accident, has a strong impact on the safety and economy operation of unit in recent years.
Summary of the invention
The present invention is used to overcome the defective of prior art and a kind of bad phenomenon such as malleation holder powder, pulsation powder delivery, disconnected powder of can effectively eliminating is provided, and makes to supply powder air and powder mixer smoothly.
The alleged problem of the present invention solves by following technical proposals:
A kind of powder air and powder mixer smoothly that supplies, comprise coal spout, body, mounting plate, bottom plate, preceding hyoplastron, back hyoplastron and square plate in the formation, plate top, the described coal spout side of being positioned at, upper and lower supporting plate is positioned at body, its special feature is: also comprise deflector in the formation, described deflector is positioned at the coal spout exit, and its leading face is provided with along preceding hyoplastron extended line, back working face is provided with along coal spout antetheca extended line, forms aditus laryngis between deflector lower end and mounting plate.
The above-mentioned powder air and powder mixer smoothly that supplies, described deflector height H is the 40-45 millimeter, described aditus laryngis height B is the 25-35 millimeter.
The above-mentioned powder air and powder mixer smoothly that supplies, described mounting plate front end is concordant with preceding hyoplastron front end, the mounting plate length L is the 450-475 millimeter, and the mounting plate lower surface is the 12-17 millimeter apart from body distance between center line E, and the bottom plate upper surface is the 65-80 millimeter apart from body distance between center line F.
The present invention is directed to common air and powder mixer under the changeable situation of coal, easily in pipeline, produce malleation holder powder and cause the boiler operating parameter instability problem, designed a kind of double bracket plate air and powder mixer that deflector is set in air and powder mixer, utilize deflector to finish bootup process, thereby keep continuously, evenly give powder coal spout whereabouts coal dust.Owing to be provided with deflector, make deflector bottom and mounting plate form aditus laryngis, high velocity air has swabbing action to coal dust, makes to be in negative pressure state in aditus laryngis and the coal spout all the time, has effectively eliminated holder powder phenomenon; In addition, mounting plate is prolonged, simultaneously upper and lower blade position is moved down, the air-flow of mounting plate top is increased, the aditus laryngis air velocity increases, and has strengthened the ejector action to coal dust.The present invention is simple in structure, cheap, is easy to realize, effect is obvious, is applicable to the occasion that industries such as generating plant pulverized coal boiler, industrial coal powder boiler and chemical industry, cement need be carried powder.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the A-A profile of Fig. 1;
Fig. 4 is deflector structure figure;
Fig. 5 is the left view of Fig. 4;
Fig. 6 is the vertical view of Fig. 4.
Number in the figure is expressed as: 1. body; 2. preceding hyoplastron; 3. coal spout; 4. deflector; 4-1. deflector leading face; 4-2. working face behind the deflector; 5. square plate; 6. hyoplastron after; 7. bottom plate; 8. mounting plate.
The specific embodiment
Think through Field Research, cold model test and numerical simulation analysis, air and powder mixer causes boiler to the main cause of the stifled powder of powder pipeline to be: ature of coal is poor, ash content is big, wind, powder mixing ratio change, the mixing resistance loss is big, and blast shakiness in the airduct disappears air and powder mixer mixing point negative pressure, be in barotropic state, because coal dust is that non-full pipe flows in the coal spout, part air-flow upper punch enters coal spout, forms general mood stream malleation holder powder phenomenon one time.Developed a kind of coal, pulverulent fuel mixer that is not subjected to aditus laryngis place pressure influence at above-mentioned reason the present invention.
Referring to Fig. 1-3, during constituting, the present invention comprises body 1, coal spout 3, mounting plate 8, bottom plate 7, preceding hyoplastron 2, back hyoplastron 6, square plate 5 and deflector 4, deflector is positioned at coal spout 3 exits, its leading face 4-1 is provided with along preceding hyoplastron extended line, back working face 4-2 is provided with along coal spout antetheca extended line, 8 of deflector lower end and mounting plates form aditus laryngis, and aditus laryngis height dimension B is the 25-35 millimeter.
Referring to Fig. 4-6, deflector is a sketch plate, and its height dimension H is the 40-45 millimeter.
Referring to Fig. 1, in the air and powder mixer body, set up deflector after, for strengthening suction and the ejector action of general mood stream to coal dust, the present invention has designed long mounting plate, and the position of upper and lower supporting plate moves down relatively.Its concrete size is as follows: mounting plate 8 front ends are concordant with preceding hyoplastron 2 front ends, and the mounting plate length L is the 450-475 millimeter, and the mounting plate lower surface is the 12-17 millimeter apart from the distance between center line E of body 1, and the bottom plate upper surface is the 65-80 millimeter apart from the distance between center line F of body 1.This structural design can make the above inlet area of mounting plate increase, and the air capacity that flows through square channel increases, and the aditus laryngis air velocity increases, and the ejector action of coal dust is strengthened.
Machine supplying powder fed coal spout with coal dust when the present invention worked, the deflector guiding coal dust that is positioned at the coal spout exit enters the aditus laryngis place that is formed by deflector bottom and mounting plate, when a general mood stream passes through aditus laryngis, form high velocity air, because suction, ejector action, form negative pressure in aditus laryngis, coal spout, coal dust is sent into the boiler furnace burning by the high velocity air suction through air and powder mixer.
Claims (2)
1. one kind supplies powder air and powder mixer smoothly, comprise coal spout, body, mounting plate, bottom plate, preceding hyoplastron, back hyoplastron and square plate in the formation, plate top, the described coal spout side of being positioned at, upper and lower supporting plate is positioned at body, it is characterized in that: also comprise deflector (4) in the formation, described deflector is positioned at coal spout (3) exit, its leading face (4-1) is provided with along preceding hyoplastron extended line, back working face (4-2) is provided with along coal spout antetheca extended line, and deflector lower end and mounting plate form aditus laryngis between (8);
Described deflector height H is the 40-45 millimeter, and described aditus laryngis height B is the 25-35 millimeter.
2. the powder air and powder mixer smoothly that supplies according to claim 1, it is characterized in that: described mounting plate (8) front end is concordant with preceding hyoplastron (2) front end, the mounting plate length L is the 450-475 millimeter, the mounting plate lower surface is the 12-17 millimeter apart from body (1) distance between center line E, and the bottom plate upper surface is the 65-80 millimeter apart from body distance between center line F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100747292A CN101571290B (en) | 2009-06-12 | 2009-06-12 | Wind-powder mixer with unhindered powder supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100747292A CN101571290B (en) | 2009-06-12 | 2009-06-12 | Wind-powder mixer with unhindered powder supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101571290A CN101571290A (en) | 2009-11-04 |
| CN101571290B true CN101571290B (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100747292A Expired - Fee Related CN101571290B (en) | 2009-06-12 | 2009-06-12 | Wind-powder mixer with unhindered powder supply |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108854634B (en) * | 2018-07-10 | 2024-04-05 | 西安交大思源科技股份有限公司 | Injection type full negative pressure air powder mixer |
| CN116715028B (en) * | 2023-08-09 | 2023-10-27 | 绵阳沃思测控技术有限公司 | Pneumatic conveying suction hopper |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425313Y (en) * | 2009-06-12 | 2010-03-17 | 华北电力大学（保定） | Wind powder blender with smooth powder supply |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425313Y (en) * | 2009-06-12 | 2010-03-17 | 华北电力大学（保定） | Wind powder blender with smooth powder supply |
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| CN101571290A (en) | 2009-11-04 |
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Granted publication date: 20110209 Termination date: 20120612 |