CN204127953U - A kind of low NOx pyrolysis furnace radiant wall burner of flat long flame - Google Patents
A kind of low NOx pyrolysis furnace radiant wall burner of flat long flame Download PDFInfo
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- CN204127953U CN204127953U CN201420574712.XU CN201420574712U CN204127953U CN 204127953 U CN204127953 U CN 204127953U CN 201420574712 U CN201420574712 U CN 201420574712U CN 204127953 U CN204127953 U CN 204127953U
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Abstract
The utility model provides a kind of low NOx pyrolysis furnace radiant wall burner of flat long flame, primarily of single-stage combustion device (1), two stage burner (2), bellows (3), burner block (4) composition, it is characterized in that the combustion air runner (7) in burner block (4) is L-type passage, entrance level, straight up, burner block (4) bottom has the flue gas recirculation passage (8) leading to combustion air runner (7) to outlet section.Single-stage combustion device (1) level penetrates burner block (4), the one-level fuel nozzle (5) of its end is placed in combustion air runner (7), two stage burner (2) extends through bellows (3) and burner block (4), the secondary fuel shower nozzle (6) of its end is placed in burner hearth, utilizes fractional combustion and flue gas recirculating technique to reduce NOx generation amount.This pyrolysis furnace radiant wall burner, operational stability is high, can form flat long flame straight up, realizes the burning of large ability and low NOx drainage.
Description
Technical field
The utility model relates to a kind of pyrolysis furnace radiant wall burner of low NOx drainage of flat long flame, particularly a kind of is that the large ability of fuel, flame are flat upwards, the side-wall gas burner of low NOx drainage with fuel gas, there is more inherent stability, be applicable on ethane cracking furnace.
Background technology
Burner is one of critical piece of ethane cracking furnace, and most of pyrolysis furnace have employed the mode of radiant wall burner and combustion bottom burner combined heat, and this configuration mode can obtain more uniform boiler tube Axial Temperature Distribution.Maximization along with pyrolysis furnace and the attention to environmental requirement and raising, simultaneously in order to reduce construction and maintenance cost, reducing burner number, developing large ability, long flame low-NOx combustor is imperative.Pyrolysis furnace only arranges combustion bottom burner, although significantly decrease the number of burner, comparatively speaking, the uniformity of heat supply is poor.Therefore meet technological requirement at heat flux distribution, and under the moderate prerequisite of burner number, had higher requirement in bottom and sidewall low-NOx combustor.
The technology in early stage and burner achieve success in various degree in large ability, long flame, low NOx drainage, but are usually applied to combustion bottom burner.For radiant wall burner, because radiant wall burner adopts half pre-mixing type combustion apapratus usually, the fuel gas injection air utilizing fuel nozzle to spray, mix with air at injector fuel gas, ejection burner fire hole forms adherent flame, flame profile limits ability and the arrangement of burner, effectively can not reduce the number of radiant wall burner, and then has influence on construction and maintenance cost.Therefore the special radiant wall burner needing a kind of improvement, it is uncomplicated in design, except environmental requirement, also meets the requirement of burning capacity, flame profile and heat flux distribution.
ZL201010296282.6 discloses a kind of side-wall gas burner reducing NOx emission, primarily of silencer cover, secondary air register, main air intake, air inlet pipe, fuel nozzle, injector, one-level burner, secondary burner, burner block composition, part fuel gas sprays into hearth combustion through one-level burner after also being mixed with it by injector injection primary air, and secondary combustion-supporting air enters burner hearth by the annular space between burner block and one-level burner and participates in burning.The secondary burner of fuel gas through extending through one-level burner of remainder sprays into burner hearth, and secondary fuel was first mixed with flue gas before entering combustion zone.This side-wall gas burner have employed fuel staging and flue gas recirculating technique reduces NOx emission, and the adherent burning of flame, is adapted at pyrolysis furnace uses.But due to the restriction of flame profile and ability, usually need to arrange many rows, number of burners is more, build and maintenance cost higher.
Summary of the invention
The purpose of this utility model is that providing a kind of is applicable to the flat long flame of ethane cracking furnace, the side-wall gas burner of low NOx drainage, greatly ability, it not only can meet environmental requirement, and can obtain good radiant wall burner flame profile, the length of flame, flame rigidity and heat flux distribution.
The purpose of this utility model is achieved in that a kind of low NOx pyrolysis furnace radiant wall burner of flat long flame, form primarily of single-stage combustion device 1, two stage burner 2, bellows 3, burner block 4, it is characterized in that burner block 4 is fixed on stove side wall furnace shell steel plate, through side wall lining, combustion air runner 7 in burner block 4 is L-type passage, horizontal inlet section is through side wall, and horizontal inlet section one end connects with vertical outlet section, and the other end is connected with bellows 3; One sidewall of the vertical outlet section of burner block is near inner furnace wall, and relative side wall surface and horizontal plane angle are α, exports vertical section cross-sectional area and diminishes gradually; Above horizontal inlet section, be parallel to this direction have through hole on burner block 4, in through hole, level penetrates single-stage combustion device 1, and one-level fuel nozzle 5 is placed in the vertical outlet section of combustion air runner 7, and the direction of one-level fuel jet orifice straight up; Two stage burner 2 extends horizontally through bellows 3, combustion air runner 7 horizontal segment, and through the through hole on burner block 4 side wall surface, make secondary fuel shower nozzle 6 be placed in burner hearth, the direction of secondary fuel spray orifice and horizontal plane angle are α, match with burner block 4 side wall surface direction; Below vertical outlet section, bottom burner block 4, have the flue gas recirculation passage 8 leading to the vertical outlet section of combustion air runner 7, burner hearth gas is entered in combustion air runner 7 by this passage.
Pyrolysis furnace radiant wall burner of the present utility model adopts classification fuel combustion and flue gas recirculating technique, reduces NOx generation amount.Combustion air runner 7 outlet section is air contracted channel straight up, to form flat long flame when burning.
The cross section of combustion air runner 7 is preferably rectangle or ellipse, preferably has arc-shaped transition between horizontal inlet section and vertical outlet section.
The cross section of flue gas recirculation passage 8 is preferably circular or rectangle.
Burner block 4 side wall surface and horizontal plane angle α are preferably 60
o~ 89
o.
The one-level fuel nozzle 5 of single-stage combustion device 1 is preferably staggered in the horizontal direction with the secondary fuel shower nozzle 6 of two stage burner 2.
When using the utility model, computational fluid dynamics (CFD) method is preferably adopted to carry out the design of burner block air flow channel; Adopt the quantity of computational fluid dynamics (CFD) method determination fuel jet orifice, layout and orientation, thus obtain gratifying flame profile and heat flux distribution.
The utility model provides a Flat-flame for cracking of ethylene furnace sidewall, low-NOx combustor, and compared with current pyrolysis furnace radiant wall burner, combustion flame is longer, and ability is larger, and NOx emission is lower; And burner of the present utility model is more economical in construction and maintenance, simpler in control, allow the operator of pyrolysis furnace optimizing and operating under stable heat flux characteristics, be specially adapted on ethane cracking furnace.
Other and further target of the present utility model, feature and advantage are by being described further in detailed description of the invention below and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the front view applying a kind of radiant wall burner of the present utility model.
Fig. 2 is the top view of radiant wall burner shown in Fig. 1.
In figure: 1-single-stage combustion device, 2-two stage burner, 3-bellows, 4-burner block, 5-one-level fuel nozzle, 6-secondary fuel shower nozzle, 7-combustion air runner, 8-flue gas recirculation passage.
Detailed description of the invention
Be a kind ofly apply the large ability for ethane cracking furnace of the present utility model, flat long flame, low NOx drainage side-wall gas burner shown in Fig. 1, form primarily of single-stage combustion device 1, two stage burner 2, bellows 3, burner block 4.It is only a kind of form of the present utility model, and the utility model is not limited in this.
Consult figure, the burner block 4 of this utility model pyrolysis furnace burner is fixed on stove side wall furnace shell steel plate, through side wall lining, combustion air runner 7 in burner block 4 is L-type passage, horizontal inlet section is through side wall, horizontal inlet section one end connects with vertical outlet section, and the other end is connected with bellows 3; One sidewall of the vertical outlet section of burner block is near inner furnace wall; Above horizontal inlet section, be parallel to this direction have through hole on burner block 4, in through hole, level penetrates single-stage combustion device 1, and one-level fuel nozzle 5 is placed in the vertical outlet section of combustion air runner 7; Two stage burner 2 extends horizontally through bellows 3, combustion air runner 7 horizontal segment, and through the through hole on burner block 4 side wall surface, make secondary fuel shower nozzle 6 be placed in burner hearth, direction and the burner block 4 side wall surface direction of secondary fuel spray orifice match; Combustion air, by bellows 3, enters burner block 4 combustion air runner 7, finally enters burner hearth, and fuel and combustion air carry out classification diffusion mixed combustion in burner hearth.
Consult Fig. 1, Fig. 2, the combustion air runner 7 in burner block 4 is L-type passage, horizontal inlet section, and cross section is rectangle; Straight up, cross section is rectangle and area reduces gradually for vertical outlet section; Horizontal inlet section and vertically arc transition between outlet section.
Consult Fig. 1, Fig. 2, have 3 flue gas recirculation passages 8 bottom burner block 4, lead to combustion air runner 7 vertically outlet section, flue gas recirculation passage 8 cross section is circular.
Consult Fig. 1, Fig. 2, burner block 4 side wall surface and horizontal plane angle α are 83
o.
Consult Fig. 1, Fig. 2, one-level fuel nozzle is placed in the vertical outlet section of combustion air runner 7, and the direction of one-level fuel jet orifice straight up.
Consult Fig. 1, Fig. 2, secondary fuel shower nozzle is placed in burner hearth, and the direction of secondary fuel spray orifice and horizontal plane angle are 83 °.
Consult Fig. 2,3 one-level fuel nozzles 5 and 4 secondary fuel shower nozzles 6 staggered in the horizontal direction.
Consult Fig. 1, Fig. 2, the design of burner block combustion air runner 7 adopts computational fluid dynamics method to carry out.
One-level fuel nozzle 5 in Fig. 1, Fig. 2, the design of secondary fuel shower nozzle 6, layout, quantity and orientation adopt computational fluid dynamics (CFD) method to design.
Claims (5)
1. the low NOx pyrolysis furnace radiant wall burner of a flat long flame, primarily of single-stage combustion device (1), two stage burner (2), bellows (3), burner block (4) composition, it is characterized in that burner block (4) is fixed on stove side wall furnace shell steel plate, through side wall lining, combustion air runner (7) in burner block (4) is L-type passage, horizontal inlet section is through side wall, horizontal inlet section one end connects with vertical outlet section, and the other end is connected with bellows (3); One sidewall of the vertical outlet section of burner block is near inner furnace wall, and relative side wall surface and horizontal plane angle are α, and vertical outlet section cross-sectional area diminishes gradually; Above horizontal inlet section, be parallel to this direction have through hole on burner block (4), in through hole, level penetrates single-stage combustion device (1), one-level fuel nozzle (5) is placed in the vertical outlet section of combustion air runner (7), and the direction of one-level fuel jet orifice straight up; Two stage burner (2) extends horizontally through bellows (3), combustion air runner (7) horizontal segment, and through the through hole on burner block (4) side wall surface, secondary fuel shower nozzle (6) is made to be placed in burner hearth, the direction of secondary fuel spray orifice and horizontal plane angle are α, match with burner block (4) side wall surface direction; Below vertical outlet section, burner block (4) bottom has the flue gas recirculation passage (8) leading to the vertical outlet section of combustion air runner (7), and burner hearth gas is entered in combustion air runner (7) by this passage.
2. pyrolysis furnace radiant wall burner according to claim 1, it is characterized in that combustion air runner (7) cross section is rectangle or ellipse, the cross-sectional area of vertical section diminishes gradually, horizontal segment and vertical intersegmental arc-shaped transition.
3. pyrolysis furnace radiant wall burner according to claim 1, is characterized in that flue gas recirculation passage (8) cross section is for circular or rectangle.
4. pyrolysis furnace radiant wall burner according to claim 1, is characterized in that angle α is 60
o~ 89
o.
5. pyrolysis furnace radiant wall burner according to claim 1, is characterized in that one-level fuel nozzle (5) and secondary fuel shower nozzle (6) are staggered in the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420574712.XU CN204127953U (en) | 2014-10-08 | 2014-10-08 | A kind of low NOx pyrolysis furnace radiant wall burner of flat long flame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420574712.XU CN204127953U (en) | 2014-10-08 | 2014-10-08 | A kind of low NOx pyrolysis furnace radiant wall burner of flat long flame |
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|---|---|
| CN204127953U true CN204127953U (en) | 2015-01-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595890A (en) * | 2015-02-05 | 2015-05-06 | 湖南吉祥石化科技股份有限公司 | Wall-attaching seamless flat-flame low nitrogen oxide emission burner |
| CN108131672A (en) * | 2018-02-13 | 2018-06-08 | 项玮 | The low nitrogen nitride flat flame heat-accumulating burner of industrial furnace |
| CN110835547A (en) * | 2018-08-16 | 2020-02-25 | 中国石化工程建设有限公司 | Ethylene cracking furnace |
| CN112292439A (en) * | 2018-04-26 | 2021-01-29 | 法国德西尼布 | Burner system for steam cracking furnace |
-
2014
- 2014-10-08 CN CN201420574712.XU patent/CN204127953U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595890A (en) * | 2015-02-05 | 2015-05-06 | 湖南吉祥石化科技股份有限公司 | Wall-attaching seamless flat-flame low nitrogen oxide emission burner |
| CN108131672A (en) * | 2018-02-13 | 2018-06-08 | 项玮 | The low nitrogen nitride flat flame heat-accumulating burner of industrial furnace |
| CN108131672B (en) * | 2018-02-13 | 2024-03-12 | 项玮 | Low-nitride flat flame heat accumulating type burner of industrial furnace |
| CN112292439A (en) * | 2018-04-26 | 2021-01-29 | 法国德西尼布 | Burner system for steam cracking furnace |
| CN112292439B (en) * | 2018-04-26 | 2022-08-23 | 法国德西尼布 | Burner system for steam cracking furnace |
| CN110835547A (en) * | 2018-08-16 | 2020-02-25 | 中国石化工程建设有限公司 | Ethylene cracking furnace |
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