CN1010501B - Coal powder flame stabilizing method and burner by use of wall-attached efflur - Google Patents
Coal powder flame stabilizing method and burner by use of wall-attached efflurInfo
- Publication number
- CN1010501B CN1010501B CN 88102411 CN88102411A CN1010501B CN 1010501 B CN1010501 B CN 1010501B CN 88102411 CN88102411 CN 88102411 CN 88102411 A CN88102411 A CN 88102411A CN 1010501 B CN1010501 B CN 1010501B
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- Prior art keywords
- power stream
- passage
- coal
- control jet
- stream passage
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Abstract
The present invention relates to a wall-attached jet powdered coal flame stabilizing method and a combustor. A jet with conventional powdered coal concentration and high flow speed is divided into a jet with high powdered coal concentration on one side and low powdered coal concentration on the other side by the attached effect of a turbulent jet and an aerodynamic method, and the goals of combustion stabilizing and pollution reduction can be reached. The combustor has the advantage of simple structure, has the function of self ash-blowing, and can adjust and control jets to be suitable for the combustion of various fuels (comprising soft coal, lean coal, partial hard coal, coal water slurry, etc.). The method and the combustor can be used as a combustor for ignition, low load combustion assistance and continuous operation, and the present invention is used for precombustion chambers, furnaces and power or industrial boilers.
Description
The present invention relates to a kind of combustion technology, particularly relate to a kind of energy-saving burner.
A kind of prior art is a kind of intensified synclastic fluid flame stabilization and burner (number of patent application CN85100050, accompanying drawing 13) thereof.A plurality of high-speed jets (generally adopting compressed air or steam) are introduced combustion chamber (1) by passage (8), because the ejector action of high-speed jet, make the air in the low speed fuel air mixture jet depart from its axis, to two side flow, thereby cause the coal powder density at the recirculating zone at center and this place higher, with overheavy firing.But in order to guarantee enough injection power, this method requires the velocity ratio of two jets to be greater than 7, and obviously, this will consume a large amount of compressed air or steam, and energy consumption is also bigger.As adopt compressed air, also to increase the maintenance of equipment and equipment; As adopting steam, too much steam consumption quantity will cause the increase of boiler heat loss, reduce boiler efficiency.In order to cause the bigger speed difference of two jets, this method adopts the low speed fuel air mixture to flow into combustion chamber (1) by power stream passage (2).The speed of conventional fuel air mixture is 16～27 meter per seconds, in this speed, because the effluxvelocity decay is fast, coal dust sinks easily in combustion chamber (1), effectively blow grey measure as not taking, the dust stratification in combustion chamber (1), the long-term safety that slagging scorification will influence burner operation.It is particularly serious when the length of this phenomenon (1) (particularly precombustion chamber) in the combustion chamber, footpath are bigger than (l/d).
Following Xiahuayuan Power direct current bluff body pre-combustion chamber burner (9～10 pages of Harbin Boiler Plant " boiler manufacturing " 1984 1 phases, accompanying drawing 14) is another kind of prior art, and it can smooth combustion bituminous coal.Because the backflow that bluff body (9) back produces is little, coal dust to light actual be that outer backflow is finished.And exteenal reflux is because of being subjected to the restriction of combustion chamber (1) (or claiming precombustion chamber) diameter dimension, can not be very big, smooth combustion can not be guaranteed when therefore this burner burning low-volatile meager coal and anthracite, the colm of ash-rich can not be burnt.
PM burner (MIT's sample, accompanying drawing 15) is the low-contamination type burner by MIT's exploitation.It utilizes mechanical means-bending channel (shown in the accompanying drawing 15) to produce centrifugation, makes the primary air jet that carries coal dust be divided into two strands of different jets of coal powder density, and top is high coal powder density jet, and the bottom is low coal powder density jet.Theory and empirical evidence: when adopting the different parallel jet tissue of this coal powder density to burn, can receive the low double effects that pollutes and improve combustion stability.As accompanying drawing 16, as the higher (C in the accompanying drawing 16 of coal powder density
1Point) or lower (C in the accompanying drawing 16
2Point) time, both burn respectively and produce NO
xAmount all than conventional pulverized-coal concentration (C in the accompanying drawing 16
0Point) burning produces NO down
xAmount much lower, and one high jet of coal powder density catches fire especially easily, so can improve the stability of burning.The shortcoming of PM burner is to adopt mechanical means to separate coal dust, and coal dust is bigger to the channel wall wearing and tearing, particularly will use extraordinary wear strip in the passage elbow.
The objective of the invention is: at the problem that above-mentioned various burners exist, seek a kind of consumed energy not quite, do not wear and tear, not dust stratification, oligosaprobic method and apparatus with good smooth combustion performance.
For achieving the above object, the present invention has taked following technical measures:
The present invention proposes a kind of wall-attached jet pulverized coal flame antihunt means and device, it is the method and the coal powder burner of a kind of novel reinforced coal powder ignition and smooth combustion.The present invention utilizes the wall attachment effect and the aerodynamic method of turbulent jet, make and a branch ofly have higher conventional speeds and the power stream of coal powder density (coal dust+air) in the porch that enters the combustion chamber, be subjected to having the diffusion guide face of geometry in particular and the effect that enters the control jet of combustion chamber by the control jet passage, depart from its axis, a side wall surface that is attached to the combustion chamber flows (when the combustion chamber is horizontally disposed, be generally downside), form a strong high temperature recirculation zone at center, the downstream part of combustion chamber.Because effect of inertia, in the power stream most of than the rough coal powder particles basically along axial-movement, the air-spray that carries fraction fine grained coal dust then off-axis turns to the side at control jet place, attaches wall and flows.Thereby form different coal powder density zones in the combustion chamber in the jet: the downstream of central jet is high coal powder density district, and pulverized coal particle is thicker; The bottom is low coal powder density district, and pulverized coal particle is thinner.Just high temperature recirculation zone and high coal powder density district match, and the coal dust of a large amount of direct heating high concentrations of high-temperature flue gas makes it light, burn, and will burn and be diffused into whole coal dust air mixing jet rapidly, play the effect of steady combustion and overheavy firing.Power stream of the present invention enters the combustion chamber with the higher conventional speeds greater than 30 meter per seconds, and the jet that flows along the combustion chamber bottom wall has the effect of good cleaning accumulated powder or ash simultaneously, plays and blows grey effect.The outlet effluxvelocity of control jet passage is less than or equal to 2 with the ratio of power stream speed, in order to avoid too consume the energy of control jet, and the speed of control jet can be regulated.
The low pollution effects of method of the present invention and device is to produce like this, because the wall attachment effect of jet is redistributed the coal powder density of original jet, and the high coal powder density of promptly a part of simmer down to, and another part dilution is low coal powder density.Two strands of jets that coal powder density is higher and lower NO that produces that burns respectively
xThe synthesis result of amount, produce NO during than general conventional pulverized-coal concentration burning
xAmount much lower.In addition, device of the present invention can be used as the first order of fractional combustion as a rule, and the excess air in its combustion chamber is smaller, and temperature levels is also lower, therefore produces NO
xAmount will be lower than general combustion system and produce NO
xAmount.
The scope of application of method of the present invention and device: use as igniting or combustion-supporting precombustion chamber; Also can be used as first group of cell burner, in this case, the secondary wind that is used for secondary firing can be disposed thereon, its down or on every side, and get 10～15% total air is arranged in cell burner as tertiary air topmost.
The invention will be further described below in conjunction with drawings and Examples:
Accompanying drawing 1 is the principle schematic of method of the present invention and device thereof;
Accompanying drawing 2 is that the A of accompanying drawing 1 is to view;
Accompanying drawing 3 is principle schematic of method of the present invention and embodiment;
Accompanying drawing 4 is that the A of accompanying drawing 3 is to view;
Accompanying drawing 5 is principle schematic of method of the present invention and embodiment two thereof;
Accompanying drawing 6 is that the A of accompanying drawing 5 is to view;
Accompanying drawing 7 is principle schematic of method of the present invention and embodiment three thereof;
Accompanying drawing 8 is that the A of accompanying drawing 7 is to view;
Accompanying drawing 9 is principle schematic of method of the present invention and embodiment four thereof;
Accompanying drawing 10 is that the A of accompanying drawing 9 is to view;
Accompanying drawing 11 is principle schematic of method of the present invention and embodiment five thereof;
Accompanying drawing 12 is that the A of accompanying drawing 11 is to view;
Accompanying drawing 13 is principle schematic of a kind of intensified synclastic fluid flame stabilization and burner thereof;
Accompanying drawing 14 is direct current bluff body pre-combustion chamber burner schematic diagrames;
Accompanying drawing 15 is PM burner schematic diagrames;
Accompanying drawing 16 is the low principle curve maps that pollute of PM burner;
When accompanying drawing 17 is devices of the present invention as the first order of cell burner two, an embodiment figure arranging of tertiary air.
The power stream passage (2) that coal powder burner of the present invention shown in the accompanying drawing 1,2 is offered by combustion chamber (1), center, end, combustion chamber (1), control jet passage (3), diffusion guide face (4) are formed; Combustion chamber (1) is the burning gallery that is positioned between power stream passage (2) and burner hearth, and power stream passage (2) is identical and parallel with control jet passage (3) direction; Diffusion guide face (4) is positioned at an end of burning gallery (1), and it is shaped as conical curved surface; The mouth of power stream passage (2) is positioned at the end of diffusion guide face (4), and the mouth of power stream passage (2) is all surrounded by diffusion guide face (4); The angle β that diffusion guide face (4) is become with power stream passage (2) is less than 45 °, and best angle β is 35 °; Diffusion guide face (4) has individual fillet surface (5) with power stream passage (2) interface, and fillet surface (5) directly is connected or the connection that keeps at a certain distance away with power stream passage (2); Have a plurality of control jet passages (3) on the diffusion guide face (4), its quantity is 1～5, and the best is 3.Control jet passage (3) in diffusion guide face (4) distribution and power stream passage (2) center line angulation α less than 90 °, optimum angle alpha is 60 °～75 °.The centre distance of power stream passage (2) and control jet passage (3) is 1.2～3 times of power stream passage (2) aditus laryngis equivalent diameter.The main body of burning gallery (1) is circular, and each control jet passage (3) and power stream passage (2) also are circular.Power stream enters burning gallery (1) from power stream passage (2), and control jet enters burning gallery (1) from control jet passage (3).When power stream passage (2) horizontally disposed, and control jet passage (3) be arranged in power stream passage (2) under the time, cleaning sinks in the best results of the dust stratification of burning gallery (1).Recirculating zone (6) coal powder density of burning gallery (1) center is higher, and the coal powder density in the wall-attached jet (7) is lower.
Coal powder burner shown in the accompanying drawing 3,4 be used for one 410 tons/time anthracite-fired boiler, replace oil nozzle when being mainly used in starting ignition and underrun, to reach the fuel-economizing purpose.Power stream passage (2) is horizontally disposed, 4 control jet passages (3) be evenly arranged in power stream passage (2) under, fillet surface (5) keeps at a certain distance away with power stream passage (2) and is connected.Coal air mixture flows into burning gallery (1) by power stream passage (2), and the speed of power stream is 30～35 meter per seconds, and control jet flows into burning gallery (1) by control jet passage (3), and its speed is 50 meter per seconds.
In the embodiment shown in the accompanying drawing 5,6, control jet passage (3) has only 1, is a flat hole of waist shape.
The main body of the burning gallery (1) of the embodiment shown in the accompanying drawing 7,8 is square, and diffusion guide face (4) has only one, is the inclined plane.
The main body of the burning gallery (1) of the embodiment shown in the accompanying drawing 9,10 is square, and diffusion guide face (4) is the inclined plane of 2 upper and lower layouts, and power stream passage (2) is a rectangle.
The main body of the burning gallery (1) of the embodiment shown in the accompanying drawing 11,12 is square, and control jet passage (3) is flat mouthful, and diffusion guide face (4) is formed on an inclined-plane below power stream passage (2) porch.
The secondary air channel of the embodiment shown in the accompanying drawing 17 (10) is arranged in top, the bottom of coal powder burner of the present invention, and tertiary air passage (11) is arranged in topmost.
Method of the present invention and device compared with prior art the results are shown in subordinate list, advantage is as follows:
1. simple in structure, manufacturing, easy to maintenance;
2. can use air blast in the general boiler room as the wind regime of control jet, not need additionally to increase air compressor or steam steam flow, consumed energy is few;
3. temperature height in recirculating zone can burn with cold wind, and the quite low anthracite of fugitive constituent is also had the effect of obvious overheavy firing;
4. not dust stratification, not slagging scorification in the burning gallery can be kept, long-play can be kept;
5. the flame range is long, is conducive to light main burner;
6. have good steady combustion performance, can be used for anthracitic steady combustion of bituminous coal, meager coal and part and burning;
7. has certain reduction NO
xEffect;
8. resistance is little, and it is little to wear and tear, and is easy to safeguard.
Method of the present invention and device have wide practical use in heat energy, combustion enginnering and energy-saving field, and it will save igniting and help fuel oil and improve significantly effect of performance aspect the low load stable combustion burning inferior coal or meager coal, anthracite-fired boiler.Can be used for simultaneously to improve existing combustion apparatus, improving its coal adaptability and efficiency of combustion in the new boiler design, make using energy source more economically, rationally.
Claims (11)
1, a kind of wall-attached jet pulverized coal flame antihunt means, the power stream of being made up of coal air mixture flows into combustion chamber (1) from the power stream passage (2) that is positioned at center, end, combustion chamber (1), control jet is by being positioned at power stream passage (2) one sides and flowing into combustion chamber (1) in the parallel control jet passage (3) of power stream passage (2), it is characterized in that power stream flows into combustion chamber (1) with the speed greater than 30 meter per seconds, control jet enters the speed of combustion chamber (1) and can regulate, and the latter and the former ratio are less than or equal to 2.
2, according to the described pulverized coal flame antihunt means of claim 1, it is characterized in that: the coal powder density of power stream is greater than 0.4 kilogram of coal dust/kg of air per kg of water evaporated, and described coal dust is meant the coal dust made by bituminous coal, meager coal, anthracite and water-coal-slurry etc.
3, a kind of coal powder burner of implementing the described pulverized coal flame antihunt means of claim 1, mainly form: combustion chamber (1) by following parts, the power stream passage (2) that center, end, combustion chamber (1) is offered, be positioned at power stream passage (2) one sides and the fluidic channel (3) parallel with power stream passage (2), it is characterized in that: described combustion chamber (1) is burning gallery, fluidic channel (3) is the control jet passage, one end of burning gallery (1) has one or more diffusion guide faces (4), the end of diffusion guide face (4) is the mouth of power stream passage (2), and the mouth of power stream passage (2) is by all or part of encirclement of diffusion guide face (4), the angle β of diffusion guide face (4) and power stream passage (2) is less than 45 °, control jet passage (3) is positioned on the side diffusion guide face (4) of burning gallery (1), and the centre distance between control jet passage (3) and the power stream passage (2) equals 1.2～3 times of power stream passage (2) aditus laryngis equivalent diameter.
4, according to the described coal powder burner of claim 3, it is characterized in that: the diffusion guide face (4) at control jet passage (3) place is 35 with the angle β that power stream passage (2) is become.
5, according to the described coal powder burner of claim 3, it is characterized in that: described each diffusion guide face (4) is clinoplain or curved surface.
6, according to claim 3 or 5 described coal powder burners, it is characterized in that: there is a fillet surface (5) joint of the end of described diffusion guide face (4) and power stream passage (2), and this fillet surface (5) and power stream passage (2) are directly or/and keep at a certain distance away and be connected.
7, according to claim 3 or 5 described coal powder burners, it is characterized in that: described control jet passage (3) is dispersed in angle α that itself and power stream passage (2) constituted less than in 90 ° the scope, and the quantity of control jet passage (3) is 1～5.
8, according to the described coal powder burner of claim 7, it is characterized in that: it is that the quantity of control jet passage is 3 in 60 °～75 ° the scope that described control jet passage (3) is dispersed in angle α that itself and power stream passage (2) constituted.
9, according to the described coal powder burner of claim 3, it is characterized in that: described power stream passage (2) and control jet passage (3) are respectively circular, square, rectangle, the flat hole of waist shape or the flat degree of lip-rounding.
10, according to the described coal powder burner of claim 3, it is characterized in that: the main body of burning gallery (1) is circular, square or rectangle.
11, according to claim 3 or 4 or 8 described coal powder burners, it is characterized in that: the main body of burning gallery (1) is for circular, diffusion guide face (4) is conical, control jet passage (3) and power stream passage (2) are circle, power stream passage (2) is a horizontal direction, 3 control jet passages (3) be evenly distributed in power stream passage (2) under.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102411 CN1010501B (en) | 1988-04-24 | 1988-04-24 | Coal powder flame stabilizing method and burner by use of wall-attached efflur |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102411 CN1010501B (en) | 1988-04-24 | 1988-04-24 | Coal powder flame stabilizing method and burner by use of wall-attached efflur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038153A CN1038153A (en) | 1989-12-20 |
| CN1010501B true CN1010501B (en) | 1990-11-21 |
Family
ID=4832154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88102411 Expired CN1010501B (en) | 1988-04-24 | 1988-04-24 | Coal powder flame stabilizing method and burner by use of wall-attached efflur |
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| Country | Link |
|---|---|
| CN (1) | CN1010501B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102278943B (en) * | 2011-05-06 | 2012-10-10 | 华东师范大学 | Instrument for detecting microlens consistency of digital microscope apparatus in non-contact way |
| CN103034043B (en) * | 2012-12-21 | 2015-04-22 | 中国科学院长春光学精密机械与物理研究所 | Curtain type shutter exposure uniformity detection device |
| CN104180676B (en) * | 2013-12-09 | 2015-08-19 | 山东大学 | The rhombus rotary cement kiln waste heat utilization heat exchanger that angle is different |
| CN103629959B (en) * | 2013-12-09 | 2014-11-19 | 山东大学 | S oot blowing method for automatically controlling waste heat utilization heat exchanger |
| CN104165530B (en) * | 2013-12-09 | 2015-08-12 | 山东大学 | A kind of rotary cement kiln waste heat utilization heat exchanger with many ash blowing mouthes |
| US9546860B2 (en) * | 2015-04-18 | 2017-01-17 | Mediatek Singapore Pte. Ltd. | Method and system for contactless dimensional measurement of articles |
| ES2809462T5 (en) | 2016-03-11 | 2024-01-15 | Air Prod & Chem | Burner device and combustion method |
-
1988
- 1988-04-24 CN CN 88102411 patent/CN1010501B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN1038153A (en) | 1989-12-20 |
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