CN108413388B - Low-nitrogen cyclone burner with circumferentially offset wind powder - Google Patents
Low-nitrogen cyclone burner with circumferentially offset wind powder Download PDFInfo
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- CN108413388B CN108413388B CN201810425905.1A CN201810425905A CN108413388B CN 108413388 B CN108413388 B CN 108413388B CN 201810425905 A CN201810425905 A CN 201810425905A CN 108413388 B CN108413388 B CN 108413388B
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- 239000000843 powder Substances 0.000 title claims abstract description 58
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 claims abstract description 59
- 238000002485 combustion reaction Methods 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The utility model relates to the field of combustors, in particular to a low-nitrogen cyclone combustor with circumferentially offset wind powder. The burner comprises a central air channel, a primary air channel, an inner secondary air channel, an outer secondary air channel, a primary air axial vane cyclone, an inner secondary air axial vane cyclone, an outer secondary air tangential vane cyclone, a primary air circumferential pulverized coal separator and an inner secondary air and outer secondary air volume offset adjusting device. The primary air circumferential pulverized coal separator divides the primary air into two parts along the circumferential direction to form a concentrated powder section and a light powder section primary air; the air quantity offset adjusting device divides the secondary air into two parts along the circumferential direction, namely a strong air section and a weak air section secondary air. The inner and outer secondary air volume offset adjusting devices are respectively a part of circumferential ring-shaped baffle and a part of circumferential cylindrical baffle. In the section of the outlet of the burner, the secondary air of the strong air section is matched with the primary air of the light powder section, and the secondary air of the weak air section is matched with the primary air of the thick powder section. The wind-powder matching mode can strengthen ignition, inhibit peak temperature of a main combustion area and remarkably reduce NOx emission.
Description
Technical Field
The utility model relates to the field of combustors, in particular to a low-nitrogen cyclone combustor with circumferentially offset wind powder.
Background
The cyclone burner is widely applied to combustion equipment such as power station boilers, industrial boilers and the like, and utilizes the cyclone to enable air flow to generate rotary motion, the air flow forms rotary jet flow after entering a hearth, an internal reflux zone is formed in the rotary jet flow, and fuel is ignited by entrainment of high-temperature flue gas in a reflux way. In the design and operation of cyclone burners, enhanced ignition, efficient combustion and low nitrogen emissions have been important research topics.
The rich-lean combustion is to reduce Nitrogen Oxides (NO) in the combustion process x ) One of the means of generation is that the combustion temperature of the pulverized coal can be reduced and NO can be inhibited by respectively burning the pulverized coal in an oxygen-enriched thin pulverized coal region and an oxygen-depleted thick pulverized coal region x Is generated.
The technical point of the prior art is that the pulverized coal is divided into two circular areas of shade along the radial direction, and the shade pulverized coal is distributed along the radial direction. The concentrated pulverized coal ring is arranged on the outer side, such as a radial concentrated-diluted cyclone pulverized coal burner in Chinese patent 93144359.1, and the concentrated pulverized coal ring is arranged on the inner side, such as a radial concentrated-diluted double-air-adjusting cyclone pulverized coal burner in Chinese patent 03134317.1, but because the primary air outlet of the burner has smaller radial dimension, the primary air is adjacent to the secondary air, and the air flow is in the air flowThe radial mixing is faster, thereby greatly compromising the actual effect of the separation of the shade and thus reducing NO x Is quite limited in effect.
In addition, there are also patents such as 200810018042.2 "a cyclone burner with concentrated and zoned standing vortex of pulverized coal in circumferential direction" and 200580007215.5 "a fuel injector with low nitrogen oxide (NOx) and improved flame stability" in which primary air is distributed at intervals of shade along circumferential direction, and the actual effect of shade is likewise compromised and the effect of reducing NOx is also limited because primary air is adjacent to secondary air.
Disclosure of Invention
In view of the defects of the prior art, the utility model provides the low-nitrogen cyclone burner with circumferentially offset wind powder, so as to practically improve the concentration separation effect of coal powder, strengthen ignition, effectively inhibit the peak temperature of a main combustion area and reduce NO combustion x Is generated.
In order to achieve the above and other related objects, the utility model provides a low-nitrogen cyclone burner with circumferentially offset wind powder, which comprises a central wind channel, a primary wind channel, an inner secondary wind channel, an outer secondary wind channel, a primary wind axial vane cyclone, an inner secondary wind axial vane cyclone, an outer secondary wind tangential vane cyclone, a primary wind circumferential pulverized coal separator, an inner secondary wind volume offset adjusting device and an outer secondary wind volume offset adjusting device.
In one embodiment, the primary air circumferential pulverized coal separator is formed by a plurality of guide vanes which are arranged along a spiral line within a partial circumferential range on the outer wall of the central air channel, and a certain gap is reserved between the guide vanes.
In one embodiment, the guide vanes of the primary air circumferential pulverized coal separator are arranged within a half circumferential range on the outer wall of the central air passage.
In one embodiment, the primary wind circumferential shade separator is located downstream of the primary wind axial vane swirler.
In one embodiment, an inner secondary air volume offset adjusting device is arranged in the inner secondary air channel, and an outer secondary air volume offset adjusting device is arranged in the outer secondary air channel.
In one embodiment, the inner secondary air volume offset adjustment device is a partial circumferential ring-shaped baffle, and the outer secondary air volume offset adjustment device is a partial circumferential cylindrical baffle.
In one embodiment, the circumferential included angles of the partial circumferential ring baffle and the partial circumferential cylindrical baffle are all 0.35-0.65 times of the circumferential angle.
In one embodiment, the primary air circumferential pulverized coal separator, the primary air axial vane cyclone, the inner secondary air axial vane cyclone, and the outer secondary air tangential vane cyclone are deflected in a clockwise direction.
In one embodiment, the primary air circumferential pulverized coal separator, the primary air axial vane cyclone, the inner secondary air axial vane cyclone, and the outer secondary air tangential vane cyclone are deflected in a counterclockwise direction.
In the utility model, a primary air circumferential pulverized coal separator divides primary air into two parts along the whole circumference to form a concentrated powder section and a light powder section primary air; the air quantity offset adjusting device divides the secondary air into two parts along the whole circumference to form strong air section secondary air and weak air section secondary air. And a wind-powder matching mode of matching the secondary wind of the strong wind section with the primary wind of the light powder section and matching the secondary wind of the weak wind section with the primary wind of the thick powder section is formed on the section of the outlet of the burner. The air-powder matching mode can strengthen ignition, inhibit peak temperature of a main combustion area and remarkably reduce NOx emission.
The combustion device provided with the low-nitrogen cyclone burner with any one of the wind powder circumferential offset can be used independently for primary wind concentration separation, inner secondary wind offset and outer secondary wind offset, and can be used simultaneously or in combination with any two of the wind powder circumferential offset.
Drawings
FIG. 1 is a schematic view of a low-nitrogen cyclone burner with circumferentially offset wind powder in a boiler according to an embodiment of the present utility model.
FIG. 2 is a schematic main sectional view of a low-nitrogen cyclone burner with circumferentially offset wind powder according to an embodiment of the utility model.
Fig. 3 is a schematic view of a primary air duct according to an embodiment of the utility model.
Fig. 4 is a schematic diagram showing the structures of the inner secondary air channel and the outer secondary air channel in the embodiment of the utility model.
Fig. 5 shows a schematic cross-sectional view of the swirl burner of the utility model at the outlet of fig. 2.
Fig. 6 shows a jet trace in an embodiment of the utility model.
Fig. 7 shows the pulverized coal concentration field at the primary air outlet of the present utility model.
Fig. 8 shows the velocity field at the secondary air outlet of the present utility model.
Fig. 9 shows velocity fields of a longitudinal section of a main combustion zone of a boiler in which a conventional cyclone burner is installed.
FIG. 10 shows velocity fields of a longitudinal section of a main combustion zone of a boiler in which the cyclone burner of the present utility model shown in FIG. 2 is installed.
Fig. 11 shows the temperature field of a longitudinal section of a main combustion zone of a boiler in which a conventional cyclone burner is installed.
FIG. 12 shows the temperature field of a longitudinal section of the main combustion zone of a boiler in which the cyclone burner of the present utility model shown in FIG. 2 is installed.
FIG. 13 shows NO in a longitudinal section of an all-hearth of a boiler equipped with a conventional cyclone burner x A concentration field.
FIG. 14 shows NO in a longitudinal section of a full furnace of a boiler equipped with the cyclone burner of the present utility model shown in FIG. 2 x A concentration field.
Description of element reference numerals
1. Low-nitrogen cyclone burner with circumferentially offset wind powder
12. Central wind channel
13. Primary air channel
131. Primary air circumferential pulverized coal separator
132. Primary air axial vane cyclone
134. Primary air-diluted powder section
133. Primary air concentrated powder section
14. Inner secondary air channel
141. Inner secondary air axial vane cyclone
142. Bias adjusting device for inner secondary air volume
143. Strong wind section of inner secondary wind
144. Inner secondary wind weak wind section
15. External secondary air channel
151. External secondary air tangential vane cyclone
152. Bias adjusting device for external secondary air quantity
153. Strong wind section of external secondary wind
154. External secondary wind weak wind section
2. Boiler
3. Separated over-fire air burner
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the utility model, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.
Fig. 1-5 illustrate an embodiment of the present utility model applicable to utility pulverized coal boilers, industrial pulverized coal boilers, various gas and oil boilers, and various other combustion apparatuses for combusting solid, liquid, and gaseous fuels in a rotary jet.
As shown in fig. 1, the cyclone burner 1 of the present utility model is installed on the front wall and the rear wall of the main combustion zone of the boiler 2 as a burner of the main combustion zone. The split over-fire air (SOFA air) burner 3 is installed at the front wall and the rear wall of the over-fire zone of the boiler 2 as a burner of the over-fire zone. In the embodiment, bituminous coal powder is used as fuel, air staged combustion is adopted, 70% of air required by coal powder combustion is sent to a main combustion area through a combustor 1, and the rest 30% of air is sent to an over-combustion area through a combustor 3.
As shown in fig. 2, the cyclone burner 1 of the present utility model includes a central air passage 12, a primary air passage 13, an inner secondary air passage 14 and an outer secondary air passage 15, which are disposed in this order from the inside to the outside. The central air channel 12 sprays direct current central air without pulverized coal into the boiler, the primary air channel 13 sprays rotational flow primary air with pulverized coal into the boiler, and the inner secondary air channel 14 and the outer secondary air channel 15 spray rotational flow secondary air into the boiler. A primary air circumferential pulverized coal separator 131 and a primary air axial vane cyclone 132 positioned upstream of the primary air circumferential pulverized coal separator 131 are provided in the primary air passage 13. An inner secondary air axial vane swirler 141 is arranged in the inner secondary air passage 14, and an outer secondary air tangential vane swirler 151 is arranged in the outer secondary air passage 15.
As shown in fig. 3, the outer wall of the central wind channel 12 is provided with a primary wind circumferential concentration separator 131 and a primary wind axial vane cyclone 132. The primary air circumferential pulverized coal separator 131 in the primary air passage 13 is composed of a plurality of guide vanes which are arranged along a spiral line within a half circumferential range on the outer wall of the central air passage 12, and certain gaps are reserved among the guide vanes. Referring to fig. 3 and 5, when the primary air passes through the primary air circumferential pulverized coal separator 131, a part of the primary air flows in a circumferential area of the primary air channel 13 where no guide vanes are provided, another part of the primary air flows in a circumferential area of the primary air channel 13 where guide vanes are provided, and part of the primary air in the area moves along the direction of the guide vanes, enters the circumferential area of the primary air channel 13 where no guide vanes are provided, merges with the primary air in the area, and the remaining primary air flows forward through gaps of the guide vanes, and finally forms two approximately semi-annular pulverized coal airflows in an outlet section of the burner 1 (area above a virtual line in fig. 5) and a primary air concentrated powder section 133 (area below the virtual line in fig. 5). The jet trajectories are shown in fig. 6. The pulverized coal ratio of the primary air of the concentrated powder section and the primary air of the light powder section can be adjusted by adjusting the angle of the guide vane.
On the basis, the secondary air volume of the strong air section and the secondary air of the weak air section can be adjusted in an offset manner through the inner secondary air volume offset adjusting device 142 and the outer secondary air volume offset adjusting device 152 at the inlets of the inner secondary air channel 14 and the outer secondary air channel 15 respectively, so that the secondary air volume at the outlet of the burner reaches the required offset distribution, namely, the cross section of the outlet of the burner forms a wind-powder matching mode of matching the secondary air of the strong air section with the primary air of the weak air section and matching the secondary air of the weak air section with the primary air of the strong air section. Fig. 2 and 4 show a specific example of the inner secondary air volume bias adjustment device 142 and the outer secondary air volume bias adjustment device 152. The inner secondary air volume bias adjustment device 142 and the outer secondary air volume bias adjustment device 152 are partial circumferential ring-shaped baffles and partial circumferential cylindrical baffles for blocking the flow of secondary air in a partial circumferential range at the inlet of the secondary air passage. When the inner secondary air passes through the inner secondary air passage 14 provided with the inner secondary air quantity offset adjustment device 142, the inner secondary air enters and rotates from the passage not provided with the inner secondary air quantity offset adjustment device, and an inner secondary air strong air section 143 (an area above the broken line in fig. 5) and an inner secondary air weak air section 144 (an area below the broken line in fig. 5) are formed in the outlet section of the burner 1. Similarly, when the external secondary air passes through the external secondary air passage 15 provided with the external secondary air quantity bias adjustment device 152, the external secondary air enters and rotates from the passage not provided with the external secondary air quantity bias adjustment device, and an external secondary air strong air section 153 (area above the broken line in fig. 5) and an external secondary air weak air section 154 (area below the broken line in fig. 5) are formed in the outlet cross section of the burner 1. The distribution positions of the strong air section secondary air and the weak air section secondary air at the outlet of the burner can be adjusted by adjusting the positions of the inner secondary air volume offset adjusting device 142 and the outer secondary air volume offset adjusting device 152, so that secondary air offset distribution is realized, namely, a wind-powder matching mode of matching the strong air section secondary air with the light powder section primary air and matching the weak air section secondary air with the thick powder section primary air is formed at the outlet section of the burner.
When the boiler operates, the wind-powder matching mode formed by the cyclone burner creates two combustion atmospheres of oxygen deficiency and oxygen enrichment on one hand. The concentrated coal powder is easy to ignite, which is favorable for ignition and low-load stable combustion of the inferior coal. The concentration of coal powder in the concentrated coal powder airflow is high, ignition is advanced and stable, the oxygen concentration is low, and the peak temperature after ignition is inhibited; the oxygen concentration in the thin pulverized coal airflow is high, but the low pulverized coal concentration also reduces the combustion temperature, thereby effectively controlling NO x Is generated. The oxygen-deficient combustion of the concentrated coal powder generates a great amount of reducing gas and can also generate NO with the combustion x Generating reduction reaction to reduce NO x Is a waste concentration of the waste. On the other hand, the wind-powder matching mode can effectively delay the mixing of the concentrated coal powder and the secondary air, so that the concentrated coal powder combustion can be kept on a longer jet flow stroke. Therefore, the cyclone burner can strengthen ignition, inhibit peak temperature of a main combustion area and remarkably reduce NOx emission.
In the same cyclone burner 1 of the present utility model, all the blades (including the primary air circumferential pulverized coal separator 131, the primary air axial blade cyclone 132, the inner secondary air axial blade cyclone 141 and the outer secondary air tangential blade cyclone 151) generating flow deflection have the same deflection direction, and can deflect in either clockwise direction or counterclockwise direction. The above embodiment illustrates a counter-clockwise deflection design, which requires only symmetrical conversion of all flow deflection blades.
The inventor carries out CFD numerical simulation of a speed field and a pulverized coal concentration field on the cyclone burner respectively so as to prove the actual effect of circumferential offset of wind powder. Fig. 7 is a distribution of the pulverized coal concentration field at the primary air outlet. Fig. 8 is a velocity field distribution at the secondary air outlet.
From the distribution of the pulverized coal concentration field, the primary air circumferential pulverized coal separator of the cyclone burner concentrates concentrated pulverized coal in a lower right area. From the view of the velocity field distribution, the secondary air of the cyclone burner of the present utility model is concentrated in the upper left region. The cyclone burner can realize circumferential offset of wind powder at the outlet of the burner.
The inventors performed a speed field, a temperature field and NO, respectively, for a boiler in which the conventional cyclone burner is installed in all of the main combustion zone and the cyclone burner of the present utility model is installed in all of the main combustion zone x CFD numerical simulations of the concentration field were used to compare the combustion differences of the two. FIGS. 9, 11 and 13 are, respectively, a longitudinal section velocity field, a temperature field and NO of a boiler equipped with a conventional cyclone burner x Distribution of concentration fields. Fig. 10, 12 and 14 show the distribution of a certain longitudinal section velocity field, temperature field and NOx concentration field, respectively, of a boiler equipped with a cyclone burner according to the present utility model.
In view of the distribution of the speed field, the cyclone burner of the utility model is biased to distribute the secondary air, and the backflow area is biased to the concentrated coal powder side, so that high-temperature air can be sucked into the concentrated coal powder area near the burner nozzle.
The temperature field distribution shows that the outlet temperature of the cyclone burner is higher, which is favorable for the combustion of inferior coal and stable combustion with low load, and compared with the traditional burner, the temperature of the lean oxygen combustion of the concentrated coal powder and the temperature of the rich oxygen combustion of the lean coal powder are lower, the temperature of the middle and later stages of combustion is also lower, and the high temperature peak area is relatively smaller, thereby providing good temperature conditions for reducing NOx.
From NO x Concentration distribution of NO at the outlet of the boiler equipped with the cyclone burner of the present utility model x The concentration is obviously reduced by about 20 percent compared with a boiler provided with a traditional cyclone burner.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (5)
1. The utility model provides a low nitrogen cyclone burner (1) of wind powder circumference offset, includes central wind passageway (12), primary air passageway (13), interior overgrate air passageway (14), outer overgrate air passageway (15) that set gradually from inside to outside, its characterized in that:
a primary air axial blade cyclone (132) and a primary air circumferential pulverized coal separator (131) are arranged in the primary air channel (13), and the primary air circumferential pulverized coal separator (131) is positioned at the downstream of the primary air axial blade cyclone (132); the primary air circumferential pulverized coal separator (131) is formed by a plurality of guide vanes which are arranged along a spiral line in a partial circumferential range on the outer wall of the central air channel (12), and certain gaps are reserved among the guide vanes;
an inner secondary air axial vane cyclone (141) and an inner secondary air volume offset adjusting device (142) are arranged in the inner secondary air channel (14); the inner secondary air volume offset adjusting device (142) is a part of circumferential ring-shaped baffle;
an outer secondary air tangential vane cyclone (151) and an outer secondary air volume offset adjusting device (152) are arranged in the outer secondary air channel (15); the outer secondary air volume offset adjusting device (152) is a part of circumference cylindrical baffle;
the primary air circumferential pulverized coal separator (131) divides primary air into two parts along the whole circumference to form a concentrated powder section and a light powder section primary air; the air quantity offset adjusting device divides the secondary air into two parts along the whole circumference to form strong air section secondary air and weak air section secondary air; and a wind-powder matching mode of matching the secondary wind of the strong wind section with the primary wind of the light powder section and matching the secondary wind of the weak wind section with the primary wind of the thick powder section is formed on the section of the outlet of the burner.
2. The wind-powder circumferentially offset low-nitrogen swirl burner (1) according to claim 1, characterized in that:
the guide vanes of the primary air circumferential pulverized coal separator (131) are arranged in a half circumferential range on the outer wall of the central air channel (12).
3. The wind-powder circumferentially offset low-nitrogen swirl burner (1) according to claim 1, characterized in that:
the circumferential included angles of the partial circumferential ring-shaped baffle and the partial circumferential cylindrical baffle are all 0.35-0.65 times of the circumferential angle.
4. The wind-powder circumferentially offset low-nitrogen swirl burner (1) according to claim 1, characterized in that:
the primary air circumferential pulverized coal separator (131), the primary air axial vane cyclone (132), the inner secondary air axial vane cyclone (141) and the outer secondary air tangential vane cyclone (151) deflect in the same direction in a single burner, and can deflect in either clockwise or anticlockwise directions.
5. A combustion device provided with the low-nitrogen cyclone burner (1) with the wind powder circumferentially offset according to any one of claims 1-4, wherein three offsets of primary wind concentration separation, inner secondary wind offset and outer secondary wind offset can be independently used, and can be simultaneously used, or any two offsets can be selected to be combined for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810425905.1A CN108413388B (en) | 2018-05-07 | 2018-05-07 | Low-nitrogen cyclone burner with circumferentially offset wind powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810425905.1A CN108413388B (en) | 2018-05-07 | 2018-05-07 | Low-nitrogen cyclone burner with circumferentially offset wind powder |
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| CN108413388A CN108413388A (en) | 2018-08-17 |
| CN108413388B true CN108413388B (en) | 2023-11-28 |
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| CN111828959B (en) * | 2020-07-23 | 2022-05-20 | 郑州轻工业大学 | Pulverized coal burner with adjustable shade and swirl blades |
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| JPH09159109A (en) * | 1995-12-08 | 1997-06-20 | Hitachi Ltd | Combustion method of pulverized coal, pulverized coal combustion device and pulverized coal combustion burner |
| CN101280921A (en) * | 2008-04-25 | 2008-10-08 | 西安交通大学 | Vortex combustor of coal fines circumferential direction concentrating sectorization stopping whorl |
| JP2009299977A (en) * | 2008-06-12 | 2009-12-24 | Ihi Corp | Burner for pulverized fuel |
| CN101487590A (en) * | 2009-02-25 | 2009-07-22 | 哈尔滨工业大学 | Low-resistance and low-NOx rotational flow coal powder burner with divergent segment |
| CN102062396A (en) * | 2010-10-13 | 2011-05-18 | 西安交通大学 | Composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner |
| CN102506424A (en) * | 2011-09-23 | 2012-06-20 | 哈尔滨工业大学 | Centrally-fuel-rich swirl pulverized coal burner adopting step type nozzle |
| CN102506425A (en) * | 2011-09-28 | 2012-06-20 | 哈尔滨工业大学 | Central-feeding swirling pulverized coal burner with central air pipeline |
| CN103162289A (en) * | 2013-03-11 | 2013-06-19 | 扬州晨光特种设备有限公司 | Rotational flow stopping block type pulverized coal concentrator |
| CN203823749U (en) * | 2014-04-22 | 2014-09-10 | 东方电气集团东方锅炉股份有限公司 | Boiler combustor |
| CN105782967A (en) * | 2014-12-25 | 2016-07-20 | 黑龙江宏宇电站设备有限公司 | Burning method of concentrated-thin type dual channel swirl burner of power station boiler |
| CN208804669U (en) * | 2018-05-07 | 2019-04-30 | 上海交通大学 | A kind of low nitrogen turbulent burner and burner of wind powder peripheral orientation polarization |
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