CN216047637U - High-regulation-ratio modular low-nitrogen combustor - Google Patents
High-regulation-ratio modular low-nitrogen combustor Download PDFInfo
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- CN216047637U CN216047637U CN202122833678.6U CN202122833678U CN216047637U CN 216047637 U CN216047637 U CN 216047637U CN 202122833678 U CN202122833678 U CN 202122833678U CN 216047637 U CN216047637 U CN 216047637U
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Abstract
The utility model provides a high-regulation-ratio modular low-nitrogen combustor which comprises a plurality of combustor modules which are spliced with each other, wherein each combustor module comprises a flame disc, a nozzle, a side air plate, an air duct side plate, an upper-layer gas pipeline and a lower-layer gas pipeline. When the burner operates at a low power, the upper layer gas pipeline supplies gas, the gas and the combustion-supporting air flowing out of the flame plate are mixed and combusted, the combustion-supporting air flowing out of the side air plate continuously blows to the flame, the flame is cooled, and the effect of reducing the content of nitrogen oxides in the flue gas is achieved. When the burner operates under high power, the upper layer gas pipeline and the lower layer gas pipeline supply gas simultaneously, the lower layer gas and air are premixed in the air duct, the burning flame is uniform, and no local high temperature exists, so that the content of nitrogen oxide in the burning smoke is effectively reduced. Not only can ensure that the combustor has larger regulation ratio in operation, but also can greatly reduce the content of nitrogen oxide in combustion flue gas and meet increasingly strict emission requirements.
Description
Technical Field
The utility model relates to the technical field of combustors, in particular to a high-regulation-ratio modular low-nitrogen combustor.
Background
With the development of society and the improvement of technological level, the requirement on environmental protection is higher and higher, and the emission requirement of industrial combustor burning tail gas is stricter and stricter. At present, the emission index of nitrogen oxides is greatly reduced, and under the condition, the traditional combustor cannot be suitable for application under new requirements and new standards. The traditional combustors are generally divided into two types, one type is a nozzle mixing type, the other type is a premixing type, the two types of combustors respectively have advantages and disadvantages, the adjustment ratio of the nozzle mixing type combustor is large, and the production requirements under different working conditions can be met, but the content of nitrogen oxides in combustion emissions of the combustors is high, so that the current stricter and stricter emission requirements are difficult to meet; the emission of nitrogen oxides of the premixing type combustor is low, and the emission requirement can be met, but the combustor has the defects that tempering is easy to cause after premixing, the regulation ratio is low, and the industrial application is passive.
SUMMERY OF THE UTILITY MODEL
To overcome the above-mentioned deficiencies of the prior art, it is an object of the present invention to provide a high turndown ratio modular low-NOx burner.
In order to achieve the purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows: a high-regulation-ratio modular low-nitrogen burner comprises a plurality of burner modules which are spliced with each other, wherein each burner module comprises a flame disc, a nozzle, a side air plate, an air duct side plate, an upper layer gas pipeline and a lower layer gas pipeline,
the air channel side plates are combined into a combustion-supporting air main air channel for providing combustion-supporting gas;
the flame plate is arranged in the middle of the air outlet of the combustion-supporting air main air duct, and a first air outlet is formed in the flame plate;
the side air plates are arranged on two sides of the flame plate, extend from the flame plate to the air outlet direction, and are provided with second air outlets;
the nozzle is arranged in the middle of the flame plate, and a fuel outlet of the nozzle is positioned on the air outlet side of the flame plate;
the upper layer gas pipeline and the lower layer gas pipeline are used for providing gas fuel;
the upper layer gas pipeline extends along the connecting line direction of each nozzle, each nozzle is communicated with the upper layer gas pipeline, and the upper layer gas pipeline further comprises a first control valve used for regulating and controlling the gas supply flow in the upper layer gas pipeline;
the lower floor's gas pipeline is located in the main wind channel of combustion-supporting wind, lower floor's gas pipeline along with the setting is extended to the air-out direction looks vertically plane in the main wind channel of combustion-supporting wind, be equipped with a plurality of fuel outlets on the gas pipeline of lower floor, still including being used for regulating and control the second control valve of air feed flow in the gas pipeline of lower floor.
By adopting the technical scheme of the utility model, the integral structure of the combustor adopts a modular design, and can be flexibly assembled according to application occasions and power requirements. Adopt upper strata gas pipeline and lower floor's gas pipeline to provide the gas respectively, when the combustor when less power operation, the second control valve is closed, only first control valve opens, thus, the gas passes through upper strata gas pipeline entering nozzle, the combustion-supporting wind mixed combustion that flows out from nozzle spun gas and flame dish, the combustion-supporting wind that comes out in the side air plate continuously blows to flame, cool off flame, the temperature around the flame has been reduced, thereby reach the effect that reduces nitrogen oxide content in the flue gas, combustion mode at this moment belongs to nozzle hybrid burning, when little fire burning, do not have the problem of tempering, the combustor can more steady operation under lower power. When the burner operates under high power, the first control valve and the second control valve are both opened, the gas in the upper layer gas pipeline is sprayed out through the nozzle and is mixed and combusted with the combustion-supporting air flowing out of the flame disk to generate flame, and after the gas in the lower layer gas pipeline is sprayed out, the gas is uniformly mixed with the combustion-supporting air in the combustion-supporting air main air channel, one part of the gas flows out of the flame disk and meets the flame ignition and combustion, the other part of the gas flows out through the side air plate and meets the flame ignition and combustion, because the gas and the air are premixed in the air channel in advance, the flame is uniformly combusted, no local high temperature exists, and thus the content of nitrogen oxide in the combustion flue gas is effectively reduced; meanwhile, the running power is high, and the combustion-supporting air quantity is relatively large, so that the flow speed of the combustion-supporting air is relatively high and higher than the flame propagation speed of fuel gas, the tempering problem can not occur at the moment, and the running safety is ensured. Not only can ensure that the combustor has larger regulation ratio in operation, but also can greatly reduce the content of nitrogen oxide in combustion flue gas and meet increasingly strict emission requirements.
Furthermore, a plurality of first air outlets distributed in a circumferential manner are arranged on the flame plate, an inclined flow deflector is arranged on the air outlet side of each first air outlet, and the inclination angle between each inclined flow deflector and the flame plate is 30-45 degrees.
Adopt above-mentioned preferred scheme, form the whirl effect through the slant water conservancy diversion piece, strengthened with the mixture from nozzle spun gas for the flame of combustor is shorter, and the heat radiation is more even, and nitrogen oxide emission reduces by a wide margin.
Furthermore, the side wind plates extend outwards from the root part in an outward expansion state, and the included angle between the side wind plates and the vertical direction is 10-15 degrees.
Further, a second air outlet on the side wind plate is in a strip shape, and the second air outlet extends from the root of the side wind plate to the top end.
Adopt above-mentioned preferred scheme, reasonable side aerofoil air outlet design can compromise the cooling flame temperature effect when the low power, and flame is stable when can guaranteeing the high power again.
Further, the ratio of the vertical depth of the side wind plates to the width of the flame plate is 1.0-1.5, the vertical depth of the side wind plates is not more than 210mm, and the width of the flame plate is not more than 150 mm.
Adopt above-mentioned preferred scheme, ensure to provide stable side wind pressure, reduce the air feed ability requirement to the fan.
Further, the top end of the nozzle is closed, the fuel outlet of the nozzle is multiple, and the fuel outlet of the nozzle faces the circumferential direction of the nozzle.
By adopting the preferable scheme, the fuel and the surrounding swirling air are promoted to be fully mixed and uniformly combusted.
Further, the fuel outlet on the lower layer gas pipeline is arranged on two sides of the lower layer gas pipeline body, and the fuel outlet on the lower layer gas pipeline faces the air channel side plate.
Further, the distance between the upper layer gas pipeline and the lower layer gas pipeline is 200-300 mm.
By adopting the preferable scheme, the gas spraying direction of the lower layer gas pipeline is vertical to the wind direction of the combustion-supporting air main air duct, and the reasonable distance between the upper layer gas pipeline and the lower layer gas pipeline ensures the premixing effect.
The gas turbine further comprises an upper air-homogenizing screen plate and a lower air-homogenizing screen plate, wherein the upper air-homogenizing screen plate is arranged below the upper gas pipeline, and the lower air-homogenizing screen plate is arranged below the lower gas pipeline.
By adopting the preferable scheme, the air volume in the air duct is uniformly adjusted by the upper air-homogenizing screen plate and the lower air-homogenizing screen plate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at C;
FIG. 3 is one of the cross-sectional structural views of the present invention;
FIG. 4 is a second cross-sectional view of the present invention;
FIG. 5 is a schematic diagram of the low power combustion state of the present invention;
FIG. 6 is a schematic diagram of the high power combustion state of the present invention.
Names of corresponding parts represented by numerals and letters in the drawings:
1-flame plate; 101-a first air outlet; 102-oblique flow deflectors; 2-a nozzle; 201-fuel outlet; 3-side wind plate; 301-a second air outlet; 4-upper layer gas pipeline; 5-lower layer gas pipeline; 501-fuel outlet; 6-upper air-homogenizing screen plate; 7-lower air-homogenizing screen plate; 8-air duct side plate; 801-combustion-supporting air main air duct.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-6, one embodiment of the present invention is: a high-regulation-ratio modular low-nitrogen burner comprises a plurality of burner modules which are spliced with each other, wherein each burner module comprises a flame disc 1, a nozzle 2, a side air plate 3, an air duct side plate 8, an upper-layer gas pipeline 4 and a lower-layer gas pipeline 5,
the air channel side plates 8 are combined into a combustion-supporting air main air channel 801 for providing combustion-supporting gas;
the flame plate 1 is arranged in the middle of an air outlet of a combustion-supporting air main air duct 801, and a first air outlet 101 is arranged on the flame plate 1;
the side wind plates 3 are arranged at two sides of the flame plate 1, the side wind plates 3 extend from the flame plate 1 to the air outlet direction, and the side wind plates 3 are provided with second air outlets 301;
the nozzle 2 is arranged in the middle of the flame plate 1, and a fuel outlet 201 of the nozzle 2 is positioned on the air outlet side of the flame plate 1;
the upper layer gas pipeline 4 and the lower layer gas pipeline 5 are used for providing gas fuel;
the upper-layer gas pipeline 4 extends along the connecting line direction of each nozzle 2, each nozzle 2 is communicated with the upper-layer gas pipeline 4, and the upper-layer gas pipeline device further comprises a first control valve used for regulating and controlling the gas supply flow in the upper-layer gas pipeline 4;
the lower layer gas pipeline 5 is arranged in the combustion-supporting air main air channel 801, the lower layer gas pipeline 5 is arranged along a plane perpendicular to the air outlet direction in the combustion-supporting air main air channel 801 in an extending mode, a plurality of fuel outlets 501 are arranged on the lower layer gas pipeline 5, and the lower layer gas pipeline air conditioning system further comprises a second control valve used for regulating and controlling the air supply flow in the lower layer gas pipeline 5.
The beneficial effect of adopting above-mentioned technical scheme is: the integral structure of the combustor adopts a modular design, and flexible assembly can be performed according to application occasions and power requirements. Adopt upper strata gas pipeline and lower floor's gas pipeline to provide the gas respectively, as figure 5, when the combustor when less power operation, the second control valve is closed, only first control valve opens, thus, the gas passes through upper strata gas pipeline entering nozzle, the combustion-supporting wind mixed combustion that flows out from nozzle spun gas and flame dish, the combustion-supporting wind that comes out in the side aerofoil continuously blows to flame, cool off flame, the temperature around the flame has been reduced, thereby reach the effect that reduces nitrogen oxide content in the flue gas, the combustion mode at this moment belongs to nozzle hybrid combustion, when the burning of small fire, the problem of tempering does not exist, the combustor can more steady operation under lower power. As shown in fig. 6, when the burner operates at high power, the first control valve and the second control valve are both opened, the gas in the upper layer gas pipeline is sprayed out through the nozzle and mixed and combusted with the combustion-supporting air flowing out of the flame disk to generate flame, and after the gas in the lower layer gas pipeline is sprayed out, the gas is uniformly mixed with the combustion-supporting air in the combustion-supporting air main air channel, one part of the gas flows out from the flame disk and meets the flame for ignition and combustion, the other part of the gas flows out through the side air plate and meets the flame for ignition and combustion, because the gas and the air are premixed in the air channel in advance, the flame is combusted uniformly, and the local high temperature does not exist, so the content of nitrogen oxide in the combustion flue gas is effectively reduced; meanwhile, the running power is high, and the combustion-supporting air quantity is relatively large, so that the flow speed of the combustion-supporting air is relatively high and higher than the flame propagation speed of fuel gas, the tempering problem can not occur at the moment, and the running safety is ensured. Not only can ensure that the combustor has larger regulation ratio in operation, but also can greatly reduce the content of nitrogen oxide in combustion flue gas and meet increasingly strict emission requirements.
As shown in fig. 2, in other embodiments of the present invention, the flame tray 1 is provided with a plurality of first air outlets 101 distributed circumferentially, an inclined baffle 102 is provided at an air outlet side of the first air outlet 101, and an inclination angle between the inclined baffle 102 and the flame tray is between 30 ° and 45 °. The inclined flow deflector 102 forms a cyclone effect, so that the mixing of gas sprayed out from the nozzle is enhanced, the flame of the burner is shorter, the heat radiation is more uniform, and the discharge amount of nitrogen oxides is greatly reduced.
In other embodiments of the utility model, as shown in figures 2 and 4, the side vanes 3 extend outwardly from the root at an angle α of between 10 ° and 15 ° to the vertical. The second air outlet on the side wind plate is in a strip shape and extends from the root of the side wind plate to the top end. The beneficial effect of adopting above-mentioned technical scheme is: the reasonable design of the air outlet of the side air plate can not only take account of the effect of cooling flame temperature in low power, but also ensure the stability of flame in high power.
In other embodiments of the utility model, as shown in fig. 4, the ratio of the vertical depth h of the side wind plates 3 to the width d of the flame tray is 1.0 to 1.5, the vertical depth of the side wind plates h is not more than 210mm, and the width of the flame tray d is not more than 150 mm. The beneficial effect of adopting above-mentioned technical scheme is: the stable side wind pressure is ensured to be provided, and the requirement on the wind supply capacity of the fan is reduced.
In other embodiments of the present invention, as shown in fig. 2 and 3, the tip of the nozzle 2 is closed, the fuel outlet 201 of the nozzle is multiple, and the fuel outlet 201 faces the circumferential direction of the nozzle. The beneficial effect of adopting above-mentioned technical scheme is: promote the fuel and the surrounding swirling wind to be fully mixed and uniformly combusted.
In other embodiments of the present invention, as shown in fig. 3, the fuel outlets 501 of the lower layer gas pipes 5 are disposed on two sides of the pipe body of the lower layer gas pipes 5, and the fuel outlets 501 of the lower layer gas pipes face the air duct side plate 8. The distance between the upper layer gas pipeline 4 and the lower layer gas pipeline 5 is 200-300 mm. The beneficial effect of adopting above-mentioned technical scheme is: the gas spraying direction of the lower layer gas pipeline is vertical to the wind direction of the combustion-supporting air main air duct, and the reasonable distance between the upper layer gas pipeline and the lower layer gas pipeline ensures the premixing effect.
In other embodiments of the present invention, the gas turbine further comprises an upper air-evening screen plate 6 and a lower air-evening screen plate 7, wherein the upper air-evening screen plate 6 is arranged below the upper gas pipeline 4, and the lower air-evening screen plate 7 is arranged below the lower gas pipeline 5. The beneficial effect of adopting above-mentioned technical scheme is: the air quantity in the air duct is uniformly adjusted through the upper air-homogenizing screen plate and the lower air-homogenizing screen plate.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (9)
1. A high-regulation-ratio modular low-nitrogen burner is characterized by comprising a plurality of burner modules which are spliced with each other, wherein each burner module comprises a flame disc, a nozzle, a side air plate, an air duct side plate, an upper layer gas pipeline and a lower layer gas pipeline,
the air channel side plates are combined into a combustion-supporting air main air channel for providing combustion-supporting gas;
the flame plate is arranged in the middle of the air outlet of the combustion-supporting air main air duct, and a first air outlet is formed in the flame plate;
the side air plates are arranged on two sides of the flame plate, extend from the flame plate to the air outlet direction, and are provided with second air outlets;
the nozzle is arranged in the middle of the flame plate, and a fuel outlet of the nozzle is positioned on the air outlet side of the flame plate;
the upper layer gas pipeline and the lower layer gas pipeline are used for providing gas fuel;
the upper layer gas pipeline extends along the connecting line direction of each nozzle, each nozzle is communicated with the upper layer gas pipeline, and the upper layer gas pipeline further comprises a first control valve used for regulating and controlling the gas supply flow in the upper layer gas pipeline;
the lower floor's gas pipeline is located in the main wind channel of combustion-supporting wind, lower floor's gas pipeline along with the setting is extended to the air-out direction looks vertically plane in the main wind channel of combustion-supporting wind, be equipped with a plurality of fuel outlets on the gas pipeline of lower floor, still including being used for regulating and control the second control valve of air feed flow in the gas pipeline of lower floor.
2. The high turn-down ratio modular low-nitrogen burner of claim 1, wherein the flame tray is provided with a plurality of first air outlets distributed circumferentially, and an inclined deflector is provided at an air outlet side of the first air outlets, and an inclination angle between the inclined deflector and the flame tray is 30 ° to 45 °.
3. The high turn ratio modular low-NOx burner of claim 1 wherein the side louvers extend outwardly from the root, the side louvers being angled from 10 ° to 15 ° from vertical.
4. The high turn ratio modular low-nitrogen burner of claim 3, wherein the second outlet of the side wind plate is in the shape of a strip, and the second outlet extends from the root to the tip of the side wind plate.
5. The high turn ratio modular low-nitrogen burner of claim 4, wherein the ratio of the vertical depth of the side louvers to the width of the flame tray is 1.0-1.5, the vertical depth of the side louvers is no greater than 210mm, and the width of the flame tray is no greater than 150 mm.
6. The high turn ratio modular low nitrogen combustor as claimed in claim 1, wherein the tip of the nozzle is closed, the fuel outlet of the nozzle is plural, and the fuel outlet of the nozzle faces the circumference of the nozzle.
7. The high turn down ratio modular low-nitrogen burner of claim 1, wherein the fuel outlets on the lower layer gas duct are disposed on both sides of the lower layer gas duct body, the fuel outlets on the lower layer gas duct being directed toward the duct side plate.
8. The high turn down ratio modular low-nitrogen burner of claim 7, wherein the distance between the upper and lower gas conduits is 200-300 mm.
9. The high turn ratio modular low-nitrogen burner of claim 7, further comprising an upper air evening screen plate and a lower air evening screen plate, wherein the upper air evening screen plate is disposed below the upper gas pipeline, and the lower air evening screen plate is disposed below the lower gas pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122833678.6U CN216047637U (en) | 2021-11-18 | 2021-11-18 | High-regulation-ratio modular low-nitrogen combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122833678.6U CN216047637U (en) | 2021-11-18 | 2021-11-18 | High-regulation-ratio modular low-nitrogen combustor |
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| Publication Number | Publication Date |
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| CN216047637U true CN216047637U (en) | 2022-03-15 |
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|---|---|---|---|
| CN202122833678.6U Active CN216047637U (en) | 2021-11-18 | 2021-11-18 | High-regulation-ratio modular low-nitrogen combustor |
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| CN (1) | CN216047637U (en) |
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- 2021-11-18 CN CN202122833678.6U patent/CN216047637U/en active Active
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