CN1162717A - Diffuser for coal nozzle burner - Google Patents
Diffuser for coal nozzle burner Download PDFInfo
- Publication number
- CN1162717A CN1162717A CN 96106667 CN96106667A CN1162717A CN 1162717 A CN1162717 A CN 1162717A CN 96106667 CN96106667 CN 96106667 CN 96106667 A CN96106667 A CN 96106667A CN 1162717 A CN1162717 A CN 1162717A
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- Prior art keywords
- coal
- diffuser
- coal nozzle
- nozzle
- axis
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Abstract
A diffuser for a coal burner has a coal nozzle with an axis and an inner surface. The diffuser comprises a reducing area cone which has tapering upstream and downstream ends, for positioning in a coal nozzle at the coal nozzle axis. A frusto-conical shroud has a small diameter upstream end and a large diameter downstream end, positioned around the reducing area cone. A plurality of support legs is connected to the reducing area cone and extends radially outwardly through the shroud for connecting to the coal nozzle. Each of the support legs is inclined at an acute angle to the axis of the coal nozzle for evenly spreading pulverized coal supplied through the coal nozzle and past the diffuser.
Description
Be generally used for the conical nozzle of coal nozzle burner, around being used for coal charge is distributed in.Experience explanation in the past, if the coal charge particle can be evenly distributed in around the coal charge side opposite, efficiency of combustion will improve so.This shows as unburned carbon contained loss nitrous oxide lower and that distribute may be less.
United States Patent (USP) the 4th, 380, show a kind of two blenders of transferring wind combustor that are used to have a diffuser for No. 202, this blender comprises the cone that a surface that is referred to as " elongation-rhombus chock plug " dwindles, and the frustoconical guard shield that surrounds this chock plug coaxially.The chock plug support is fixed to chock plug the inside of guard shield securely.The chock plug support is shaped to the flow resistance minimum that makes the dusty fuel that air carries.Except two chock plug framves of the axis that is parallel to diffuser shown in the figure, do not remake further announcement for the quantity of chock plug frame.
United States Patent (USP) the 4th, 479 is meant a kind of Venturi nozzle that is used for the powdery coal charge No. 442, and it comprises the current divider of the expansion with a plurality of swirl vanes.
United States Patent (USP) the 2nd, 912 shows a kind of pulverised fuel burner with a plurality of blades that circumferencial direction separates for No. 942.Their cross section all is a triangle, and their summit is all towards burner axis.Blade all is positioned on the inner surface of frustoconical guard shield.
The present invention proposes a kind of leg-supporting structure that is used for cone-shaped diffuser, to improve the coal nozzle of powdery coal charge in coal burning device distribution situation on every side.According to the present invention, designed the cone that a surface dwindles, it has four leg-supportings around the cone of evenly dwindling on the surface at interval, and between cone and frustoconical guard shield.Article four, leg-supporting all acutangulates with burner axis, particularly 10 ° of angles.
Use four angled leg-supportings,, make it be better than before with two designs that are parallel to the leg-supporting of nozzle-axis because it can form good, the beat all type of flow.
Therefore, one object of the present invention is to provide a kind of diffuser of coal burning device of the coal nozzle that is used to have an axis and an inner surface, this diffuser comprises: have the cone that the surface of taper upstream and downstream end dwindles, to be positioned on the nozzle-axis in the coal nozzle; The frustoconical guard shield that one minor diameter upstream extremity and major diameter downstream are arranged, it be positioned at the surface dwindle cone around; And a plurality of be connected to that the surface dwindles on the cone and by this guard shield extend radially outwardly, to be connected to the leg-supporting on the coal nozzle, the axis of each oblique coal nozzle in leg-supporting acute angle ground will be carrying and powdery coal charge by diffuser sprays equably through coal nozzle.
Another object of the present invention be to adopt four respectively have of one's own plate shaped, and separately with the leg-supporting of approximate 10 ° the oblique coal nozzle axis of angle.
A further object of the present invention is to provide a kind of improved diffuser that is used for coal nozzle, its simplicity of design, and sound construction and cost are low.
Each feature that constitutes novelty of the present invention is pointed out in claims appended and that constitute this explanatory text part particularly.For understand the present invention preferably, by using service advantages and the specific purposes obtained, relate to the narration part that a preferred embodiment of the present invention is shown.
Fig. 1 is the axial, cross-sectional view with coal burning device of diffuser of the present invention;
Fig. 2 is the rearview of diffuser of the present invention; And
Fig. 3 is the sectional view along Fig. 2 line 3-3.
Fig. 1 shows a kind of typical burner with cone-shaped diffuser of the present invention.Diffuser 10 is near the outlet end 12c of upstream tube curved 14, to redistribute coal charge.The cone of one surperficial convergent or frustoconical guard shield gather some coal charges for 16 sections, and the inner surface 18 of coal nozzle 20 to of pushing.Diffuser of the present invention comprises four and nozzle-axis 24 angled leg-supportings 22.
Develop coal charge diffuser of the present invention and be used for improving coal nozzle coal charge distribution condition on every side.New cone-shaped diffuser 10 has kept the cone 11 of the surperficial convergent of original design, but has added other leg-supporting.Ask for an interview Fig. 2, all four leg-supportings 22 all are inclined to 10 ° of angles.The use of these four leg-supportings can make this diffuser be better than any known designs.
This structure has the advantage of better distribution coal charge, and the coal charge that more can bear nozzle upstream is rolled into rope form.
The inventor adopts existing coal tubular construction with the load of a typical coal charge and air this new diffuser of quantitative test recently.For diffuser of the present invention, compared with the prior art the uniform distribution situation that the air velocity distribution of locating in the end of burner nozzle demonstrates coal charge has substantive the improvement.To the coal charge particle speed of nozzle-end raising is arranged also through diffuser.Compared with the prior art new design has much better distribution condition on every side at the edge, and at the center core than low speed is arranged.For this structure and section lotus, under the distribution condition that is improved, new design has increased by 1/3rd inches water level meter wind loss.
Coal charge is rolled in the transport process that rope form occurs in the particle (coal charge) that is carried by air.Particle is drawn by flow media, because pipeline, flow media lags behind particle in the variation of flow pattern.This makes coal charge become concentrated, and moves in the fraction of cross-section of pipeline.This coal charge " being rolled into rope form " shifts to burner nozzle through pipeline.Diffuser with four leg-supportings of the present invention helps to destroy this concentrated coal charge rope form, and coal charge distributes and provide preferably.
These improvement will reveal in coal-burning boiler, promptly reduce unburned carbon contained loss, reduce distributing of nitrous oxide.
Referring to Fig. 1, the burner that diffuser 10 of the present invention is installed is pointed out by collectivity mark 10, is contained in one and is formed in the inwall 32 and the bellows 30 between the outer wall 34 of body of heater.On that elbow 14 is connected to primary air and powdery or other granular coal charge source.Coal charge is carried along coal nozzle 20, and generates flame, and this flame signature is different part A in Fig. 1, B, C and D.
Around the outlet of coal nozzle 20 or downstream end, form an annular, inner secondary air space 36, and around the flame base portion, carry secondary air, slough fugitive constituent active region A with the abundance that forms high temperature one fuel.At label 35 places, some inner secondary airs are recycled to the base portion of flame.
One external secondary air zone 38 is formed on the external secondary air mixture 39 that mixes with flame with conveying of inner area on every side, thereby forms reduction class, the NO in the zone C in area B
xDecompose the char combustion in the region D.Slide damper 42 is regulated the air stream that flows to secondary district, and it is measured by an air measurement mechanism 44.Adjustable rotating vane 46 is arranged in the inside and outside secondary air district.One air separation plate 48 is arranged between secondary air district inside and outside, and also is arranged on and is used for that flame is configured as and points to the port of export place of the coal nozzle 20 of air stream.Rotating vane 50 also can be arranged on the upstream extremity of external secondary air zone, with the feature of further change flame.
Though for the application of principle of the present invention is described, be shown specifically and described a specific embodiment of the present invention, only be appreciated that otherwise breaking away from also available other method of these principles embodies the present invention.
Claims (9)
1. diffuser that is used for the coal burning device, it has the coal nozzle that contains an axis and an inner surface, and described diffuser comprises:
The cone of surperficial convergent that the upstream and downstream end of taper is arranged is to be positioned in the coal nozzle on the coal nozzle axis;
Have a minor diameter upstream extremity and a frustoconical guard shield than the major diameter downstream, it is positioned at around the cone of surperficial convergent; And
A plurality of being connected on the described surperficial tapered cone and through described guard shield extends radially outwardly to be connected to the leg-supporting on the described coal nozzle, described each leg-supporting is with the axis of the oblique described coal nozzle of acute angle, and spray the powdery coal charge of carrying through described coal nozzle equably, and pass through diffuser.
2. diffuser as claimed in claim 1 is characterized in that, approximate 10 ° of described acute angle.
3. diffuser as claimed in claim 2 is characterized in that, comprises that four are connected to described surperficial tapered cone and the leg-supporting of spaced at equal intervals around the described coal nozzle axis.
4. diffuser as claimed in claim 3 is characterized in that, described each bar leg-supporting is an one flat plate.
5. burning of particulate burning of coal device, it comprises;
Form the device of bellows;
Along the coal nozzle of a nozzle-axis through the bellows extension;
Diffuser in nozzle, described diffuser comprises the cone of a surperficial convergent, this cone has the upstream extremity and the downstream of taper, to be positioned in the coal nozzle on the coal nozzle axis;
Have a minor diameter upstream extremity and a frustoconical guard shield than the major diameter downstream, it be positioned at described surperficial convergent cone around; A plurality of cones that are connected to described surperficial convergent and through described guard shield extend radially outwardly, to be connected to the leg-supporting on the described coal nozzle, each described leg-supporting with the described axis of the oblique described coal nozzle of an acute angle spraying the powdery coal charge of carrying by described coal nozzle equably, and by this diffuser;
Around the port of export of described coal nozzle, form the device in inside and outside secondary air district, so that secondary air is transported to the zone of a port of export that centers on described nozzle from described bellows; And
Be used for providing the device of graininess coal charge and primary air to described coal nozzle.
6. burner as claimed in claim 5 is characterized in that, comprises a plurality of rotating vanes in described each inside and outside secondary air district.
7. burner as claimed in claim 6 is characterized in that, approximate 10 ° of described acute angle.
8. burner as claimed in claim 7 is characterized in that, it comprises four cones that are connected to described surperficial convergent and the leg-supporting of spaced at equal intervals around described coal nozzle axis.
9. burner as claimed in claim 8 is characterized in that, described each leg-supporting is an one flat plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96106667 CN1162717A (en) | 1995-05-23 | 1996-05-22 | Diffuser for coal nozzle burner |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US448,206 | 1995-05-23 | ||
| CN 96106667 CN1162717A (en) | 1995-05-23 | 1996-05-22 | Diffuser for coal nozzle burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1162717A true CN1162717A (en) | 1997-10-22 |
Family
ID=5119314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96106667 Pending CN1162717A (en) | 1995-05-23 | 1996-05-22 | Diffuser for coal nozzle burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1162717A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101173767B (en) * | 2006-10-31 | 2012-07-18 | 通用电气公司 | Method and apparatus for reducing stresses induced to combustor assemblies |
| CN103277793A (en) * | 2013-05-27 | 2013-09-04 | 杨占春 | Thick and thin separation rotational flow pulverized coal burner |
| US8991323B2 (en) | 2008-11-14 | 2015-03-31 | Babcock & Wilcox Power Generation Group, Inc. | Bladed coal diffuser and coal line balancing device |
-
1996
- 1996-05-22 CN CN 96106667 patent/CN1162717A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101173767B (en) * | 2006-10-31 | 2012-07-18 | 通用电气公司 | Method and apparatus for reducing stresses induced to combustor assemblies |
| US8991323B2 (en) | 2008-11-14 | 2015-03-31 | Babcock & Wilcox Power Generation Group, Inc. | Bladed coal diffuser and coal line balancing device |
| CN103277793A (en) * | 2013-05-27 | 2013-09-04 | 杨占春 | Thick and thin separation rotational flow pulverized coal burner |
| CN103277793B (en) * | 2013-05-27 | 2015-07-01 | 杨占春 | Thick and thin separation rotational flow pulverized coal burner |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |