CN205227306U - Deep or light hierarchical buggy low NOx burner - Google Patents
Deep or light hierarchical buggy low NOx burner Download PDFInfo
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- CN205227306U CN205227306U CN201521001804.XU CN201521001804U CN205227306U CN 205227306 U CN205227306 U CN 205227306U CN 201521001804 U CN201521001804 U CN 201521001804U CN 205227306 U CN205227306 U CN 205227306U
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Abstract
The utility model relates to a pulverized coal boiler combustor technical field more specifically, relates to a deep or light hierarchical buggy low NOx burner, mainly is applicable to the combustor of pulverized coal combustion equipment such as power plant boiler, industrial boiler, the utility model provides a reduce the wearing and tearing and the pressure drop of entire system equipment and optimize the deep or light hierarchical buggy low NOx burner who burns, including the combustor casing, be provided with the special concentrated phase dog of the deep or light dog of mound type, the deep or light looks baffle of shower nozzle, mound type, burner port and the water droplet type flame stabilizer that ignites in the combustor casing, type deep or light dog in mound has threely, and be the echelonment and lay, type deep or light dog rear end in mound is provided with the deep or light looks baffle of spout, the deep or light looks baffle of spout top is provided with the special concentrated phase dog of mound type, type special concentrated phase dog rear end in mound is provided with the water droplet type flame stabilizer that ignites, water droplet type ignite the terminal of flame stabilizer and burner port edge parallel and level, the utility model discloses mainly use in the aspect of the boiler.
Description
Technical field
The utility model relates to coal powder fired boiler burner technical field, more specifically, relates to a kind of coal dust low NO of deep or light classification, is mainly applicable to the burner of the coal-dust combustion device such as station boiler, Industrial Boiler.
Background technology
Nitrogen oxide (NOx) is one of Air Pollutants of discharged from coal-fired boiler.Coal-fired power station boiler and Industrial Boiler discharge a large amount of nitrogen oxide, heavy damage ecological environment, threaten human health.At present, controlling the control measure of NOx emission has two large classes, and a class is the low NOx combusting technology in fired coal combustion process, and another kind of is flue-gas denitrification technology after combustion, controls its generation or is reduced.Low NOx combusting technology, mainly according to the NOx formation mechanism in combustion process, by the growing amount organizing stove combustion process to reduce NOx, thus reduces the discharge capacity of boiler NOx.In conventional stove, low NOx combusting technology mainly contains low oxygen combustion, low-NOx combustor, flue gas recirculation, and fuel or air staged combustion technology.
Low-NOx combustor is NOx control technology the most frequently used in pulverized-coal fired boiler, and it not only can highly organizedly burn, and has obvious reduction of discharging effect to the generation of NOx.In order to reduce the discharge capacity of nitrogen oxide in combustion process, there is the design of the low-NOx combustor of much version at present.Deep or light deviation burning is a kind of combustion technology reducing boiler combustion discharge NOx that recent domestic extensively adopts, this method relies on certain burner internal structure, coal dust in pulverized coal flow and air are shunted to greatest extent, change wind, the coal ratio of burner, thus coal dust generation deviation is burnt, the reducing atmosphere of burner hearth on a large scale not needing Researched of Air Staging Combustion Burning Pulverized Coal to produce, belongs to the fractional combustion on microcosmic, to reduce the generation of NOx.Existing concentration coal burner, utilize channel bend to concentrate coal dust more, rich-lean ratio is caused with dull and stereotyped or helical blade, make charging in stove, form two strands of different coal dust jets of shades, as " a kind of low-NOx pulverized coal burner of constant velocity shade type " (patent No.: CN101055076), the type elbow coal burner, all by coal dust incidence rate inertia, coal dust is got rid of the sidewall to carrier pipe side, in order to ensure that shunting rear coal dust concentrated phase has enough speed, the impact of elbow coal dust to tube wall is very big, require high to pipe wall material, lose burner life, DC burner fundamentally can avoid the loss of elbow, existing various Direct-flow Bias Burner at present, the baffle plate of shunting block and dense stock nozzle is utilized to carry out air-coal separating to grain flow, as " enriched multiple straight-through coal burners " (patent No. CN1439841), this type of burner outlet air-flow is direct jet, outlet is divided into dense stock nozzles and light stock nozzles in the horizontal direction, its feature is that angle of flare is little, far firing range, but due to one-sided, block or baffle plate are set, on the low side or not remarkable to Pulverized Coal Concentration effect, particularly for the coal of low-volatile, air capacity during this air-flow coal dust firing still higher than or close to the air capacity in coal needed for volatile combustion, easily produce NOx at the burning initial stage, in addition, compared with vortex burner, surrounding Involving velocity is little and do not have central backflow, unfavorable to catching fire, and surely fires weak effect.In order to add intense steady combusting and efficiency of combustion, conventional DC burner polygamy closes the shower nozzle adopted with flame holder, patent " a kind of coal dust decoupling burning device of dense side classification " (patent No.: CN202452487U), this design not only can improve the effect of decoupling burning, structure is simple, and can dock with different Pulverized Coal Concentration device, but the wearing and tearing of its whole system equipment and pressure drop need to improve.
Utility model content
In order to reduce wearing and tearing and the pressure drop of whole system equipment further, Optimizing Combustion, the utility model provides a kind of coal dust low NO of deep or light classification.
The technical solution adopted in the utility model is:
A kind of coal dust low NO of deep or light classification, comprise burner shell, the deep or light block of mound type is provided with in described burner shell, the deep or light phase dividing plate of shower nozzle, the special concentrated phase block of mound type, burner nozzle and droplet-shaped are ignited flame holder, the described mound deep or light block of type has three, stepped laying, type deep or light block rear end, described mound is provided with the deep or light phase dividing plate of spout, the special concentrated phase block of mound type is provided with above the deep or light phase dividing plate of described spout, type special concentrated phase block rear end in described mound is provided with droplet-shaped and ignites flame holder, the ignite end of flame holder of described droplet-shaped is concordant with burner nozzle edge.
The described mound deep or light block of type comprises windward side, lee face and bottom surface, described windward side is straight plate or oblique wave-shape board, described lee face is indent panel, the angle of described bottom surface and windward side is 20 °-45 °, and described windward side and lee face intersection are 1:2-4 far from the distance of bottom surface and the length ratio of horizontal cross-section, bottom surface.
The windward side of described three deep or light blocks of mound type is parallel to each other, the lee face of last block and the windward side horizontal level of a rear block overlapped, overlap distance be the 0-1/4 of bottom surface horizontal cross-section length doubly, between three bottom surfaces, vertical direction distance be windward side and lee face intersection far from 1/3-1 times of bottom surface distance.
The top of the deep or light phase dividing plate of described spout is concentrated phase outlet, and bottom is dilute phase outlet, bends in the middle part of the deep or light phase dividing plate of described spout, concentrated phase is exported and is reduced gradually to burner centre by burner nozzle, and described dilute phase outlet is compressed at burner nozzle place.
The shape of the special concentrated phase block of described mound type is identical with the deep or light block of mound type, and volume is 0.8 times of the deep or light block of mound type.
Described droplet-shaped flame holder of igniting is the shape of front end point, end circle, and concentrated phase outlet is divided into two parts by described droplet-shaped flame holder of igniting, and top is the outlet of special concentrated phase, and bottom be that time dilute phase exports.
Described burner shell is cuboid, and the burner shell that the deep or light front edge of board of being separated by of described spout is corresponding is regular cuboid, and regular cuboid rear end becomes large in the vertical direction gradually, and burner nozzle place bore is maximum, in horn-like.
The deep or light block of described mound type and the special concentrated phase block of mound type all can rotate around body central vertical line.
The beneficial effect that compared with prior art the utility model has is:
1, the design not only remain DC burner features simple structure, far firing range and turbulent burner flameholding, burner hearth not easily slagging scorification corrosion double dominant; And, by the once deep or light shunting of three pieces of mound type blocks and the deep or light shunting of secondary of the special concentrated phase block of mound type and droplet-shaped flame holder, local breeze airflow can be made to reach special dense concentrated effect;
2, the design passes through the double action of the deep or light phase dividing plate of spout and droplet-shaped flame holder, increases the separating distance between dense rare two-phase, extends the time of dense rare two-phase mixtures, the burning of strengthening deviation, and strengthening suppresses the effect of NOx formation;
3, the droplet-shaped of the design is ignited flame holder, utilize the effect of round and smooth wall drainage, the hot-air that can entrainment burner opening better enters burner, thus the difficulty fire coal of high ash content, low volatile is caught fire in time, mix with air in good time, ensure stability and the economy of burning;
4, in the design, burner nozzle is horn-like, to ignite in conjunction with mound type block, spout deep or light phase dividing plate, special concentrated phase block and droplet-shaped the distribution of three strands of pulverized coal flows that flame holder formed, the incorporation time of the special concentrated phase of abundant prolongation and dilute phase, strengthening decoupling burning, reduces the NOx produced in burning further;
5, in the design each mound type block plate and pulverized coal flow angle can flexible modulation windward, the change of different boiler load and Coal rank can be adapted to;
6, the structure of the deep or light block of mound type in the design, can reduce the impact of coal dust backflow to baffle plate, strengthen its stability, extend its service life;
7, the design's structure is simple, reliable, is not easy to burn out and wear and tear, and is convenient to safeguard and maintenance.
Accompanying drawing explanation
Below by accompanying drawing, detailed description of the invention of the present utility model is described in further detail.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the schematic diagram of the utility model mound type block;
Fig. 3 is the stereogram of the utility model mound type block.
In figure: 1 be burner shell, 2 be the deep or light block of mound type, 3 be shower nozzle deep or light phase dividing plate, 4 is the special concentrated phase block of mound type, 5 be that burner nozzle, 6 exports, 14 is that dilute phase exports, 15 is that special concentrated phase exports, 16 is that secondary dilute phase exports for droplet-shaped concentrated phase of igniting flame holder, 7 be windward side, 8 be lee face, 9 be bottom surface, 10 be the intersection, 11 of windward side and lee face be the distance of intersection far from bottom surface, 12 of windward side and lee face to be type block center, mound vertical line, 13 be.
Detailed description of the invention
The utility model will be further described by reference to the accompanying drawings for embodiment below.
As shown in Figure 1, a kind of coal dust low NO of deep or light classification comprises: burner shell 1, three deep or light blocks 2 of mound type, the deep or light phase dividing plate 3 of spout, the special concentrated phase block 4 of mound type, and burner nozzle 5 and droplet-shaped are ignited flame holder 6.
As shown in Figure 2, the windward side 7 of the deep or light block of described mound type 2 is straight plate, and lee face 8 is inner concave, and bottom surface 9 and windward side 7 are in 20 °-45 °, and base, type cross section, mound 9 should between 1:2 to 1:4 apart from two sides intersection point spacing 11 and base 9 length ratio; (see figure 3) is rotated on type block Ke Raoti center vertical line, this mound (Y-direction) 12, to regulate angle between windward side 7 and pulverized coal flow; Type deep or light block 2 in described mound has three pieces, stepped laying in burner shell 1; Three block windward sides 7 are parallel to each other, the lee face 8 of last block is overlapped with the windward side horizontal level (X-direction) of a rear block, overlap distance is the 0-1/4 of base 9, type cross section, mound length, and the spacing of block bottom surface is base, type cross section, mound 9 to meeting, the 1/3-1 of the spacing 11 of lee face intersection point 10.
Deep or light two-phase powder is split up into deep or light two strands by described spout deep or light phase dividing plate 3; Bend in the middle part of this baffle plate, make concentrated phase export 13 and reduced gradually by burner nozzle 5 to burner centre, dilute phase exports 14 and is then compressed at burner nozzle 5 place.
Described mound type special concentrated phase block 4 shape is identical with mound type deep or light block 2, and size is 0.8 times of the deep or light block 2 of mound type; The special concentrated phase block 4 of this mound type is positioned at concentrated phase and exports 13 sides, by rotating, can regulate the angle between windward side and pulverized coal flow.
Described droplet-shaped flame holder 6 of igniting is positioned at concentrated phase and exports 13 centers; Along pulverized coal flow direction, this flame holder 6 of igniting is point in front end, the shape of end circle; Nose circle is concordant with burner nozzle 5 edge.Concentrated phase outlet 13 is divided into the special concentrated phase outlet 15 of close hull outside and exports 16 two strands near the secondary dilute phase at burner nozzle 5 center by this stabilizer 6 of igniting.
Described burner shell 1 is cuboid tubular, wherein along coal dust direction of advance, first half section is regular cuboid, and by spout deep or light phase dividing plate 3 front end, housing is highly constant along (Y-direction), but the vertical line direction (Z-direction) along coal dust flow direction becomes greatly gradually, and burner nozzle 5 place bore is maximum, burner nozzle 5 is in horn-like.
Be described below by specific embodiment, to enable the technical solution of the utility model easier to understand.
Specific embodiment is as follows: first the pulverized coal flow be delivered in burner shell 1 by outside power transportation pipe flows through three grades of mound type blocks 2.Pulverized coal particle clashes into the windward side 7 of mound type block, inertia and elastic collision make pulverized coal particle rebound above windward side 7, therefore pulverized coal particle is guided by the inclined-plane of mound type block, advances step by step to inclined-plane, windward side 7 direction, finally enters the concentrated phase outlet 13 above the deep or light phase dividing plate 3 of spout; And the impact that the little air of quality is subject to block is smaller, can be flowed by gap, therefore portion of air flows into the dilute phase outlet 14 below the deep or light phase dividing plate 3 of spout along type block bottom surface, mound 9; Thus, through the separation barrier effect of three grades of mound type blocks 2, pulverized coal flow is made to obtain an air-coal separating.
After the pulverized coal flow of an air-coal separating flows into the concentrated phase outlet 13 above the deep or light phase dividing plate 3 of spout, the separation running into again the special concentrated phase block 4 of mound type stops, obtains secondary air-coal separating.Through the special concentrated phase of secondary air-coal separating again through dense skew back face drainage and the compression of droplet-shaped flame holder 6, finally export 15 by the special concentrated phase of spout and spray in burner hearth high-temperature region; The air-flow flowed out by droplet-shaped flame holder 6 opposite side, then containing few coal dust, is thus called time dilute phase outlet 16.This is flowed out by spout central, special concentrated phase and dilute phase is separated.
Arrange described in special thick coal culm airflow passes droplet-shaped ignite flame holder 6 time, due to the structure of droplet-shaped slope wall, make to be formed in concentrated phase circulation road that outer sidewind coal powder density near spout shell body is higher, trend that flow velocity coal powder density that is faster, center in spout and flow velocity are corresponding reduction; Because droplet-shaped flame holder 6 of igniting is circular arc type at nozzle, drainage is had to the high temperature gas flow in burner hearth, larger backflow space is formed at burner nozzle 5 place, make from the heat smoke amount of burner hearth backflow larger, and outside spout shell body special thick coal culm air-flow more easily and heat smoke joint, make pulverized coal pyrolysis and burning velocity higher.
This design is by the shunting of twice air-coal separating and nozzle droplet-shaped flame holder 6, pulverized coal flow is divided into special concentrated phase, secondary dilute phase and dilute phase three strands, wherein special concentrated phase and dilute phase separate by secondary dilute phase, lengthen the distance of special concentrated phase and dilute phase, extend the time that special concentrated phase mixes with dilute phase; Simultaneously, owing to bending in the middle part of the deep or light phase dividing plate 3 of spout, concentrated phase is reduced gradually by burner nozzle 5 to burner centre, and dilute phase is then compressed at burner nozzle 5, add the horn-like structure of burner nozzle 5, more enhance and postpone mixing of special concentrated phase and dilute phase.The combustion system of such cooperation quadrangle tangential circle or the polygonal circle of contact, makes special concentrated phase spray into burner hearth central high temperature district, and dilute phase then enters hearth combustion along the circle of contact outside burner hearth central combustion zone, forms the combustion process of lighting a fire step by step.The special dense phase pulverized coal gas flow temperature entering burner hearth center raises rapidly, coal dust generation fast pyrogenation, gasification, burning, because special thick coal culm air-flow oxygen content is extremely low, discharge the strong reducing property such as CO, hydrocarbon gas after coal pyrolytic gasified, the NOx that this stage can be generated, is converted into N in a large number
2.After special concentrated phase gas stream burning, in succession progressively mix with secondary dilute phase and dilute phase, and burn.Suitable Secondary Air can be supplemented, to ensure the efficiency of combustion of coal dust at burning zone edges.
The windward side 7 of mound described in the utility model type block also can be the forms such as oblique wave wave, if can play stop and guide pulverized coal flow to effect.
Mound described in the utility model type block size, number, position positioned opposite can adjust according to the size of coal variety and burner and structure, adapt to different ruuning situation.
Claims (8)
1. the coal dust low NO of a deep or light classification, comprise burner shell (1), it is characterized in that: in described burner shell (1), be provided with the deep or light block of mound type (2), the deep or light phase dividing plate (3) of shower nozzle, special concentrated phase block (4) of mound type, burner nozzle (5) and droplet-shaped are ignited flame holder (6), the deep or light block of described mound type (2) has three, stepped laying, type deep or light block (2) rear end in described mound is provided with the deep or light phase dividing plate (3) of spout, described spout deep or light phase dividing plate (3) top is provided with special concentrated phase block (4) of mound type, type special concentrated phase block (4) rear end in described mound is provided with droplet-shaped and ignites flame holder (6), the ignite end of flame holder (6) of described droplet-shaped is concordant with burner nozzle (5) edge.
2. the coal dust low NO of a kind of deep or light classification according to claim 1, it is characterized in that: the deep or light block of described mound type (2) comprises windward side (7), lee face (8) and bottom surface (9), described windward side (7) is straight plate or oblique wave-shape board, described lee face (8) is indent panel, the angle of described bottom surface (9) and windward side (7) is 20 °-45 °, and described windward side (7) and lee face (8) intersection are 1:2-4 far from the length ratio of the distance of bottom surface (9) and bottom surface (9) horizontal cross-section.
3. the coal dust low NO of a kind of deep or light classification according to claim 2, it is characterized in that: the windward side (7) of described three deep or light blocks of mound type (2) is parallel to each other, the lee face (8) of last block is overlapped with windward side (7) horizontal level of a rear block, overlap distance be the 0-1/4 of bottom surface (9) horizontal cross-section length doubly, between three bottom surfaces (9), vertical direction distance be windward side (7) and lee face (8) intersection far from 1/3-1 times of bottom surface (9) distance.
4. the coal dust low NO of a kind of deep or light classification according to claim 1, it is characterized in that: the top of the deep or light phase dividing plate (3) of described spout is concentrated phase outlet (13), bottom is dilute phase outlet (14), deep or light phase dividing plate (3) the middle part bending of described spout, make concentrated phase export (13) to be reduced gradually to burner centre by burner nozzle (5), described dilute phase outlet (14) is compressed at burner nozzle (5) place.
5. the coal dust low NO of a kind of deep or light classification according to claim 1, is characterized in that: the shape of special concentrated phase block (4) of described mound type is identical with the deep or light block of mound type (2), and volume is 0.8 times of the deep or light block of mound type (2).
6. the coal dust low NO of a kind of deep or light classification according to claim 1, it is characterized in that: described droplet-shaped is ignited, and flame holder (6) is front end point, the shape of end circle, described droplet-shaped ignite flame holder (6) by concentrated phase outlet (13) be divided into two parts, top is special concentrated phase outlet (15), and bottom is time dilute phase outlet (16).
7. the coal dust low NO of a kind of deep or light classification according to any one of claim 1-6, it is characterized in that: described burner shell (1) is cuboid, burner shell (1) corresponding to described spout deep or light phase dividing plate (3) front end is regular cuboid, rule cuboid rear end becomes large in the vertical direction gradually, burner nozzle (5) place bore is maximum, in horn-like.
8. the coal dust low NO of a kind of deep or light classification according to any one of claim 1-6, is characterized in that: the deep or light block of described mound type (2) and special concentrated phase block (4) of mound type all can be rotated around body central vertical line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521001804.XU CN205227306U (en) | 2015-12-07 | 2015-12-07 | Deep or light hierarchical buggy low NOx burner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521001804.XU CN205227306U (en) | 2015-12-07 | 2015-12-07 | Deep or light hierarchical buggy low NOx burner |
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| CN205227306U true CN205227306U (en) | 2016-05-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151014A (en) * | 2018-01-03 | 2018-06-12 | 哈尔滨工业大学 | A kind of lower resistance louver pulverized coal concentrator with triangular prism structure concentration grid |
| CN109442396A (en) * | 2018-11-28 | 2019-03-08 | 华北电力大学 | A kind of horizontal and Louver type concentrated diluted pulverized coal burner |
| CN112368513A (en) * | 2018-04-06 | 2021-02-12 | 资科公司 | Low NOx burner and flow momentum enhancing device |
-
2015
- 2015-12-07 CN CN201521001804.XU patent/CN205227306U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151014A (en) * | 2018-01-03 | 2018-06-12 | 哈尔滨工业大学 | A kind of lower resistance louver pulverized coal concentrator with triangular prism structure concentration grid |
| CN112368513A (en) * | 2018-04-06 | 2021-02-12 | 资科公司 | Low NOx burner and flow momentum enhancing device |
| CN112368513B (en) * | 2018-04-06 | 2023-12-05 | 资科公司 | Low NOx burner and flow momentum enhancing device |
| CN109442396A (en) * | 2018-11-28 | 2019-03-08 | 华北电力大学 | A kind of horizontal and Louver type concentrated diluted pulverized coal burner |
| CN109442396B (en) * | 2018-11-28 | 2024-06-04 | 华北电力大学 | Shutter type horizontal thick and thin pulverized coal burner |
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