CN110578917A - Variable arch type double-stage arch W-shaped flame boiler device - Google Patents
Variable arch type double-stage arch W-shaped flame boiler device Download PDFInfo
- Publication number
- CN110578917A CN110578917A CN201910985335.6A CN201910985335A CN110578917A CN 110578917 A CN110578917 A CN 110578917A CN 201910985335 A CN201910985335 A CN 201910985335A CN 110578917 A CN110578917 A CN 110578917A
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- Prior art keywords
- arch
- stage
- nozzle
- variable
- air nozzles
- Prior art date
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Links
- 239000000446 fuel Substances 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 30
- 239000002956 ash Substances 0.000 abstract description 6
- 239000010881 fly ash Substances 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 101150097977 arch-1 gene Proteins 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a variable arch type two-stage arch W-shaped flame boiler device, which comprises a front wall water-cooled wall and a rear wall water-cooled wall which are symmetrically arranged front and back, wherein the front wall water-cooled wall and the rear wall water-cooled wall are respectively an upper hearth, a variable arch type two-stage arch, a lower hearth and an ash bucket section from top to bottom, a second-stage over-fire air nozzle is arranged on the upper hearth, and a first-stage over-fire air nozzle, a multi-purpose secondary fuel burner nozzle, a main burner nozzle, an over-arch inner secondary air nozzle and an over-arch outer secondary air nozzle are respectively arranged on the variable arch type two-stage arch from high to low. By using the staged combustion principle and changing the arrangement mode of the burners and air distribution, the NO is further reducedxThe content of the fly ash meets the requirement of ultra-clean emission, and the defect of high carbon content of fly ash caused by mismatching of air volume distribution during staged air supply combustion is overcome. A good effect is obtained.
Description
Technical Field
The invention relates to a boiler, in particular to a variable arch type double-stage arch W-shaped flame boiler device, and belongs to the technical field of boiler equipment.
Background
W-shape of anthracite currently used for combustionWhen the flame boiler is in operation, NO in the flue gasxThe content is high, even after being modified into a low-nitrogen burner, the NOx content at the outlet of a hearth is 800mg/m3. Meanwhile, the over-fire air is arranged at the outlet of the hearth, and the pulverized coal is combusted in a grading manner by graded air supply so as to reduce NO in the flue gasxThe content of (a). In the conventional W-shaped flame boiler, the hearth space is rapidly narrowed at the upper part of the outlet of the burner, and the space required by secondary combustion is lacked, but the conventional modification scheme is used for reducing NOXEmissions also tend to cause a reduction in boiler combustion economy.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the variable arch double-stage arch W-shaped flame boiler device achieves the purpose of reducing NOx discharge by utilizing the pulverized coal reburning technology and changing the arrangement mode of a combustor and secondary air, and solves the existing problems.
The technical scheme of the invention is as follows: a W-shaped flame boiler device with variable arch type double-stage arches comprises a front wall water-cooling wall and a rear wall water-cooling wall which are symmetrically arranged front and rear, wherein the front wall water-cooling wall and the rear wall water-cooling wall are respectively provided with an upper hearth, a variable arch type double-stage arch, a lower hearth and an ash bucket section from top to bottom, a second-stage over-fire air nozzle is arranged on the upper hearth, and a first-stage over-fire air nozzle, a multipurpose secondary fuel burner nozzle, a main burner nozzle, an arch type inner secondary air nozzle and an arch type outer secondary air nozzle are respectively arranged on the variable arch type double-stage arch from high to low.
The lower hearth is vertically arranged, secondary air nozzles under the arch are arranged at the position, close to the ash bucket, of the lower hearth, horizontal secondary air nozzles under the arch are arranged between the secondary air nozzles under the arch, and ventilation air nozzles under the arch are arranged above the secondary air nozzles under the arch.
The variable arch type double-stage arch comprises a first-stage arch and a second-stage arch, an included angle between the first-stage arch and a horizontal plane is 10-20 degrees of upward inclination, an included angle between the second-stage arch and the horizontal plane is 40-50 degrees of upward inclination, a multipurpose secondary fuel burner nozzle is arranged in the middle of the first-stage arch, a first-stage over-fire air nozzle is arranged at the top of the first-stage arch, a main burner nozzle is arranged on the upper portion of the second-stage arch, and an over-arch secondary air nozzle is arranged at the position, close to a lower hearth, of.
The second-stage overfire air of the second-stage overfire air nozzle is sprayed in a horizontal mode, and the included angle between the axis of the first-stage overfire air nozzle and the horizontal plane is declined by 10-25 degrees.
The main burner nozzle is a circular nozzle, and the main burner is vertically arranged on the main burner nozzle.
The secondary air nozzles under the arch are of rectangular structures and are provided with air doors with declination angles of 0-55 degrees.
the multi-purpose secondary fuel combustor nozzle is provided with a secondary fuel combustor, and the injection angle of the secondary fuel is horizontally declined by 40-50 degrees.
The invention has the beneficial effects that: compared with the prior art, the technical scheme of the invention increases the space of the secondary combustion area by changing the arrangement mode of the burners and the air distribution by utilizing the staged combustion principle. The relatively independent and wide secondary combustion area and the secondary fuel nozzle which is obliquely downwards injected strengthen the mixing of secondary fuel and smoke and increase the staying and reaction time of the secondary fuel and high-temperature smoke in the high-temperature oxygen-deficient secondary combustion area, thereby strengthening the reduction reaction of NOx, reducing the emission of NOx, and simultaneously, the strong mixing and the sufficient staying time are more beneficial to the burnout of the fuel. In addition, the relatively independent secondary combustion zone can reduce the influence and interference of the secondary fuel on the main combustion zone. This arrangement can further reduce NOxThe content of the fly ash meets the requirement of ultra-clean emission, and the defect of high carbon content of fly ash caused by mismatching of air volume distribution during staged air supply combustion is overcome.
Drawings
FIG. 1 is a schematic structural view of the present invention;
Fig. 2 is a side view of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example (b): as shown in attached figures 1-2, the W-shaped flame boiler device with variable arch type double-stage arch comprises a boiler body with front and back symmetrical structuresThe device comprises a front wall water-cooled wall and a rear wall water-cooled wall, wherein the front wall water-cooled wall and the rear wall water-cooled wall are respectively provided with an upper hearth 12, a variable arch double-stage arch 1, a lower hearth 11 and an ash bucket section 15 from top to bottom, a secondary over-fire air nozzle 10 is arranged on the upper hearth 12, and a primary over-fire air nozzle 9, a multipurpose secondary fuel burner nozzle 5, a main burner nozzle 2, an arch inner secondary air nozzle 3 and an arch outer secondary air nozzle 4 are respectively arranged on the variable arch double-stage arch 1 from high to low. The combustor area is changed from the single-arch arrangement of a conventional W-shaped flame combustion boiler into the double-arch arrangement, secondary fuel is arranged on a second-stage arch and is injected obliquely downwards, so that a relatively independent and wide secondary combustion area is constructed, and the injected secondary fuel has an excess air coefficient alpha<1, further reducing NOx formed in the primary combustion zone to N2. Compared with the traditional single-arch arrangement (the secondary fuel can only be arranged in the upper hearth), the relatively independent and wide secondary combustion area and the secondary fuel nozzle which is obliquely downwards injected strengthen the mixing of the secondary fuel and the flue gas and increase the staying time and the reaction time of the secondary fuel and the high-temperature flue gas in the high-temperature oxygen-deficient secondary combustion area, thereby strengthening the reduction reaction of NOx, reducing the emission of NOx, and simultaneously, the strong mixing and the sufficient staying time are more beneficial to the burnout of the fuel. In addition, the relatively independent secondary combustion zone can reduce the influence and interference of the secondary fuel on the main combustion zone.
Further, the lower hearth 11 is vertically arranged, the secondary air nozzles 6 under the arch are arranged at the position, close to the ash bucket section 15, of the lower hearth 11, the horizontal secondary air nozzles 7 under the arch are arranged between the secondary air nozzles 6 under the arch, and the ventilation air nozzles 8 under the arch are arranged above the secondary air nozzles 6 under the arch. The circular nozzle is arranged at the same elevation of the secondary air nozzle 6 under the arch, the horizontal secondary air under the arch is arranged, and higher air speed penetrates into the W-shaped flame to strengthen later-stage mixing, so that multistage depth grading air distribution along the way is formed, and impact and lifting to the pulverized coal flame of the main burner are reduced as much as possible.
An arch lower ventilation air nozzle 8 is arranged on an arch lower vertical wall above the arch lower secondary air nozzle 6 with an adjustable downward inclination angle, and ventilation air is sent into a hearth for combustion at a larger downward inclination angle (about 45 degrees) in a normal condition. When the exhaust gas is switched to the nozzles 5 of the multi-purpose secondary fuel burner, hot secondary air can be introduced into the arch exhaust gas nozzles 8 to form arch secondary air with a fixed declination angle.
Further, the variable arch type double-stage arch 1 comprises a first-stage arch 13 and a second-stage arch 14, an included angle between the first-stage arch 13 and a horizontal plane is 10-20 degrees of upward inclination, an included angle between the second-stage arch 14 and the horizontal plane is 40-50 degrees of upward inclination, a multipurpose secondary fuel burner nozzle 5 is arranged in the middle of the first-stage arch 13, a first-stage over-fire air nozzle 9 is arranged at the top of the first-stage arch 13, a main burner nozzle 2 is arranged on the upper portion of the second-stage arch 14, and an over-arch secondary air nozzle 4 is arranged at the position, close to the lower hearth 11, of the.
Further, the second-stage over-fire air of the second-stage over-fire air nozzle 10 is sprayed in a horizontal mode, and the included angle between the axis of the first-stage over-fire air nozzle 9 and the horizontal plane is declined by 10-25 degrees.
Further, the main burner nozzle 2 is a circular nozzle, and the main burner is vertically arranged on the main burner nozzle 2. The main burner is preferably a straight-flow burner with a circular nozzle which is vertically arranged downwards, the rigidity and the downward-flushing capability of primary air can be enhanced, the high-temperature flue gas backflow of a lower hearth can be enhanced, the retention time of pulverized coal in the lower hearth can be prolonged, and the stable combustion and the burnout of the pulverized coal of the main burner can be facilitated.
An arch-up inner secondary air (close to the nozzle of the main burner) and an arch-up outer secondary air (close to the wall) are arranged on the outer side (close to the front wall and the rear wall) of the nozzle 2 of the main burner, and the secondary air ports are preferably arranged vertically downwards by adopting circular nozzles. This facilitates premature mixing of the primary and secondary air and enhances the downwash capability of the secondary air over the arch. In addition, the air quantity of secondary air on the arch, the down-flushing capacity and the mixing distance and time between the secondary air and the primary air pulverized coal flame can be changed by adjusting the secondary air door on the arch and the secondary air door on the arch.
Further, the secondary air nozzles 6 under the arch are of a rectangular structure and are provided with air doors with declination angle adjusting ranges of 0-55 degrees. A rectangular under-arch secondary air nozzle 6 with an adjustable downward inclination angle is arranged on the under-arch vertical wall close to the ash cooling hopper, and the horizontal downward inclination angle is 0-55 degrees adjustable, so that the flame shape of the W-shaped pulverized coal is adjusted.
Further, the multi-purpose secondary fuel burner nozzle 5 is provided with a secondary fuel burner, and the injection angle of the secondary fuel is horizontally declined by 40-50 degrees. A multipurpose secondary fuel burner is arranged on the second-stage arch, and secondary fuel (ultrafine powder or gas fuel) is injected into the secondary combustion zone at a large downward inclination angle (about 45 degrees) to realize fuel staged combustion; when no separate secondary combustion is available or the secondary fuel is disabled for any reason, the under-arch exhaust gas can be switched to the multi-purpose secondary fuel burner on the secondary arch for use as secondary fuel; or hot secondary air is introduced into the multipurpose secondary fuel burner and used as secondary arch over-fire air.
Furthermore, a first-stage over-fire air nozzle 9 is arranged at the throat part of the second-stage arch at a smaller downward inclination angle (about 25 degrees), and a horizontal second-stage over-fire air nozzle 10 is arranged at the upper hearth, so that the coal powder over-fire is improved, and the requirement of NOx emission is met.
Further, under normal conditions with separate secondary fuel, the exhaust air is fed from the under-arch exhaust air nozzle 8; when no independent secondary fuel exists, if the NOx emission can meet the requirement, the secondary fuel combustor is used as the over-fire air as much as possible, otherwise, the exhaust gas can be switched to the secondary fuel for use; by switching and adjusting the secondary fuel and the arch-down ventilation air nozzle 8 and the arch-up secondary air and the arch-down secondary air, the large-amplitude adjustment of the fuel and the secondary air among different areas in the height direction can be realized, the flame down-stroke and the later-stage mixing are enhanced on the basis of avoiding the too early mixing of the primary air and the secondary air, the deep graded air distribution which develops gradually along the way is realized, and the burning-out of the pulverized coal is improved as much as possible while the NOx emission requirement is met.
The arrangement of the two-stage arch ensures the space of secondary combustion, the relatively independent and wide secondary combustion area and the secondary fuel nozzle which is obliquely injected downwards strengthen the mixing of secondary fuel and smoke and increase the staying and reaction time of the secondary fuel and high-temperature smoke in the high-temperature oxygen-deficient secondary combustion area, thereby strengthening the reduction reaction of NOx, reducing the emission of NOx, and simultaneously, the strong mixing and the sufficient staying time are more beneficial to the burnout of the fuel. In addition, the relatively independent secondary combustion zone can reduce the influence and interference of the secondary fuel on the main combustion zone.
By using the fuel reburning technology, the fuel is fed into the hearth in stages, the fuel is sprayed above the main flame of the burner, and then the over-fire air is arranged at the upper part of the reburning area to enable the unburned carbon to be combusted for three times, so that the NO is reducedxThe content also ensures the aim of fully burning the coal powder. Dead gas and reburning fuel are fed into the hearth at the position of the slope water-cooled wall after the arch is changed, so that the volume of a reburning area is increased, and NO formed in a main burning areaxCan be fully reduced in the reburning area. When no reburning fuel is added and the exhaust gas enters the hearth independently, a primary burnout zone can be formed at the upper part of the main combustion zone, and a secondary burnout zone is formed at the graded air position of the upper hearth. Ensuring the full combustion of the coal powder.
The present invention is not described in detail, but is known to those skilled in the art. Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The utility model provides a become two-stage arch "W" type flame boiler plant of arch type, it includes front wall water-cooling wall and back wall water-cooling wall that front and back symmetrical arrangement, its characterized in that: the front wall water-cooled wall and the rear wall water-cooled wall are respectively provided with an upper hearth (12), a variable arch double-stage arch (1), a lower hearth (11) and an ash bucket section (15) from top to bottom, secondary overfire air nozzles (10) are arranged on the upper hearth (12), primary overfire air nozzles (9), multi-purpose secondary fuel burner nozzles (5), main burner nozzles (2), arch inner secondary air nozzles (3) and arch outer secondary air nozzles (4) are respectively arranged on the variable arch double-stage arch (1) from high to low, the variable arch double-stage arch (1) comprises a primary arch (13) and a secondary arch (14), an included angle between the primary arch (13) and a horizontal plane is 10-20 degrees of upward inclination, an included angle between the secondary arch (14) and the horizontal plane is 40-50 degrees of upward inclination, the multi-purpose secondary burner nozzles (5) are arranged in the middle of the primary arch (13), and the primary overfire air nozzles (9) are arranged at the top of the primary arch (13), the primary burner nozzles (2) are arranged at the upper part of the secondary arch (14), and the secondary air nozzles (4) are arranged at the position of the secondary arch (14) close to the lower hearth (11).
2. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the lower hearth (11) is vertically arranged, the part, close to the ash bucket section (15), of the lower hearth (11) is provided with the secondary air nozzles (6) under the arch, the horizontal secondary air nozzles (7) under the arch are arranged between the secondary air nozzles (6) under the arch, and the ventilation air nozzles (8) under the arch are arranged above the secondary air nozzles (6) under the arch.
3. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the secondary overfire air of the secondary overfire air nozzle (10) is sprayed in a horizontal mode, and the included angle between the axis of the primary overfire air nozzle (9) and the horizontal plane is declined by 10-25 degrees.
4. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the main burner nozzle (2) is a circular nozzle, and the main burner is vertically arranged on the main burner nozzle (2).
5. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 2, wherein: the secondary air nozzles (6) under the arch are of rectangular structures and are provided with air doors with declination angle adjusting ranges of 0-55 degrees.
6. A variable arch type two-stage arch "W" type flame boiler apparatus according to claim 1, wherein: the multi-purpose secondary fuel combustor nozzle (5) is provided with a secondary fuel combustor, and the injection angle of the secondary fuel is horizontally declined by 40-50 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910985335.6A CN110578917A (en) | 2019-10-16 | 2019-10-16 | Variable arch type double-stage arch W-shaped flame boiler device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910985335.6A CN110578917A (en) | 2019-10-16 | 2019-10-16 | Variable arch type double-stage arch W-shaped flame boiler device |
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| Publication Number | Publication Date |
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| CN110578917A true CN110578917A (en) | 2019-12-17 |
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| CN201910985335.6A Pending CN110578917A (en) | 2019-10-16 | 2019-10-16 | Variable arch type double-stage arch W-shaped flame boiler device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358730A (en) * | 2008-09-24 | 2009-02-04 | 哈尔滨工业大学 | Over-fired air device arranged at junction of upper and lower of hearth for W type flame boiler |
| CN101832548A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工业大学 | Method for arch single-stage injection fractional combustion and W flame boiler for realizing method |
| CN106524137A (en) * | 2016-10-26 | 2017-03-22 | 哈尔滨工业大学 | Multi-injection staged W flame boiler using swirl pulverized coal burner |
| CN108758613A (en) * | 2018-05-23 | 2018-11-06 | 中机国能电力工程有限公司 | One kind four encircles W flame twin-stage bias combustion device |
| CN210801151U (en) * | 2019-10-16 | 2020-06-19 | 贵州电网有限责任公司 | Variable-arch double-stage arch W-shaped flame boiler structure |
-
2019
- 2019-10-16 CN CN201910985335.6A patent/CN110578917A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358730A (en) * | 2008-09-24 | 2009-02-04 | 哈尔滨工业大学 | Over-fired air device arranged at junction of upper and lower of hearth for W type flame boiler |
| CN101832548A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工业大学 | Method for arch single-stage injection fractional combustion and W flame boiler for realizing method |
| CN106524137A (en) * | 2016-10-26 | 2017-03-22 | 哈尔滨工业大学 | Multi-injection staged W flame boiler using swirl pulverized coal burner |
| CN108758613A (en) * | 2018-05-23 | 2018-11-06 | 中机国能电力工程有限公司 | One kind four encircles W flame twin-stage bias combustion device |
| CN210801151U (en) * | 2019-10-16 | 2020-06-19 | 贵州电网有限责任公司 | Variable-arch double-stage arch W-shaped flame boiler structure |
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