CN212777338U - Natural induced air gas burner structure with low-emission sectional combustion - Google Patents
Natural induced air gas burner structure with low-emission sectional combustion Download PDFInfo
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- CN212777338U CN212777338U CN202021709127.8U CN202021709127U CN212777338U CN 212777338 U CN212777338 U CN 212777338U CN 202021709127 U CN202021709127 U CN 202021709127U CN 212777338 U CN212777338 U CN 212777338U
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Abstract
The utility model discloses a low natural induced air gas burner structure that discharges sectional combustion, include: the fuel gas burner comprises a central air inlet pipe, a lateral air inlet pipe coaxially sleeved on the outer side of the central air inlet pipe, a main fuel gas pipe, a peripheral fuel distribution branch pipe and a fuel ring cavity, wherein the main fuel gas pipe, the peripheral fuel distribution branch pipe and the fuel ring cavity are arranged in the central air inlet pipe; the main gas pipe is communicated with a fuel ring cavity through a peripheral fuel distribution branch pipe, and the fuel ring cavity is positioned at the air outlet end of the central air inlet pipe and is coaxial; the outer ring surface of the fuel ring cavity is provided with a plurality of inclined fuel branch pipes, and the axial end surface of the fuel ring cavity is provided with a plurality of peripheral fuel injection holes and a plurality of inner peripheral fuel injection holes. The utility model has the advantages of it is following: (1) the mixing of air and fuel gas is enhanced, so that the mixing is more uniform, the combustion efficiency is improved, and the thermal efficiency of the boiler is increased; (2) the flame length is reduced, and the flame is prevented from scouring the bottom plate of the boiler; (3) the sectional combustion reduces the generation of nitrogen oxides.
Description
Technical Field
The utility model relates to a combustor technical field, concretely relates to low natural induced air gas burner structure of discharging segmentation burning.
Background
The burner is a core part of the boiler, and the thermal efficiency, environmental emission and the like of the boiler are greatly dependent on the burner. With the increasing social requirements on environmental protection, the gas burner which belongs to clean combustion is widely applied. The national standards in environmental protection are continuously improved at present, and the structure and technology adopted by the original existing burner can not meet the new environmental protection requirements and needs to be improved.
One form of burners matched with the existing boiler is a natural induced draft type burner. The natural induced draft type burner has the advantages of simple structure, no need of forced blast of an air blower, low energy consumption, convenient maintenance, reliable operation, no backfire and very stable combustion. However, there are some disadvantages: (1) the combustion heat intensity is low, the flame is long, and a longer boiler hearth is needed; (2) incomplete combustion is easily caused by non-uniform mixing of fuel and air, and a large amount of excess air must be supplied to complete combustion; (3) because the excess air coefficient is larger, the combustion heat intensity is low, the heat loss of the boiler is increased, and the heat efficiency is reduced; (4) the flame is concentrated, the range of a high-temperature area of the flame is large, and the emission of nitrogen oxides is high.
Chinese patent publication No. CN108386831A discloses a natural gas boiler burner, which adopts air to be injected by a main nozzle pipeline in multiple paths, mixes with fuel to obtain premixed gas when passing through a main fuel chamber, and injects the premixed gas into a hearth through an outlet of the main nozzle, and is configured with multiple paths of on-duty fuel to be injected into the hearth, so that the distribution of fuel and air in a combustion zone is adjusted, the flame temperature in the combustion zone is reduced, the presence of on-duty flame stabilizes the flame, so that the fuel and air in the burner are mixed more uniformly, and in addition, by adopting fuel axial staged combustion, the peak temperature of the flame is low, which is beneficial to optimizing the temperature field of the hearth and reducing NOx emission.
However, natural gas boiler burners still suffer from the following drawbacks: after the main fuel enters the main nozzle pipeline through the radial small holes of the main nozzle pipeline, due to the fact that the mixing time of the main fuel and air is short and no reasonable mixing method exists, the mixing effect is poor, concentration and temperature distribution in a combustion area are uneven, and incomplete combustion is caused; in addition, the main nozzle pipeline and the on-duty fuel pipeline are axially arranged, the flame length is very long, and high-temperature flue gas is easy to scour the bottom of the hearth.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a natural induced air gas burner structure of low emission segmentation burning through optimizing the structure, uses the gas staged combustion technique to natural induced air technique, aims at solving or improving the common problem of natural induced air gas burner commonly used.
To achieve the above object, the present invention adopts the following technique.
A low-emission staged-combustion natural draft gas burner structure, comprising: the fuel gas burner comprises a central air inlet pipe, a lateral air inlet pipe coaxially sleeved on the outer side of the central air inlet pipe, a main fuel gas pipe, a peripheral fuel distribution branch pipe and a fuel ring cavity, wherein the main fuel gas pipe, the peripheral fuel distribution branch pipe and the fuel ring cavity are arranged in the central air inlet pipe; the main gas pipe is communicated with the fuel ring cavity through the peripheral fuel distribution branch pipe, and the fuel ring cavity is positioned at the air outlet end of the central air inlet pipe and is coaxially arranged with the central air inlet pipe; the fuel ring cavity is characterized in that a plurality of inclined fuel branch pipes which are uniformly distributed are arranged on the outer annular surface of the fuel ring cavity, and a plurality of peripheral fuel injection holes and a plurality of inner peripheral fuel injection holes which are uniformly distributed are arranged on the axial end surface of the fuel ring cavity.
In one possible implementation, the angled fuel legs are angled to point in a direction peripheral to the central air inlet duct; the peripheral fuel injection holes are obliquely directed to the peripheral direction of the central air inlet pipe; the inner fuel injection holes are obliquely directed to the center direction of the central air inlet pipe.
In a possible implementation manner, an air swirling device located inside the inner annular surface of the fuel ring chamber is arranged in the central air inlet pipe, the air swirling device comprises a plurality of air swirling blades, and a central axial air channel is arranged in the center of the air swirling device.
In one possible implementation, the air swirling device further comprises a cylindrical connecting piece located at the center of the central air inlet pipe, and the center of the cylindrical connecting piece is hollow to form the central axial air channel; the inner end of the air swirl vane is connected to the cylindrical connecting piece, and the outer end of the air swirl vane is connected to the inner annular surface of the fuel ring cavity.
In one possible implementation, a part of the air entering the central air inlet pipe flows through the central axial air channel to form a primary air channel, a part of the air flows through the gaps between the air swirl vanes to form a secondary air channel, and a part of the air flows through the annular seam between the outer annular surface of the fuel annular chamber and the inner wall of the central air inlet pipe to form a tertiary air channel; and air entering the lateral air inlet pipe flows through the lateral air inlet pipe and flows out from the air outlet end to form a four-stage air channel.
In one possible implementation mode, the number of the blades of the air swirl blade is 8-16, and the swirl angle is 20-60 degrees; the number of the inclined fuel branch pipes is 6-20, and the inclination angle is 15-60 degrees; the number of the peripheral fuel injection holes is 3-20, and the inclination angle is 10-60 degrees; the number of the inner fuel injection holes is 2-20, and the inclination angle is 10-60 degrees.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
(1) the mixing of air and fuel gas is enhanced, so that the mixing is more uniform, the combustion efficiency is improved, and the thermal efficiency of the boiler is increased;
(2) the flame length is reduced, and the flame is prevented from scouring the bottom plate of the boiler;
(3) the sectional combustion reduces the generation of nitrogen oxides.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments and the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a cross-sectional view of a burner configuration provided in an embodiment of the present invention;
fig. 2 is an elevation view of a burner arrangement provided in an embodiment of the present invention;
fig. 3 is a perspective view of a burner structure provided in an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The following are detailed descriptions of the respective embodiments.
Referring to fig. 1 to 3, an embodiment of the present invention provides a natural draft gas burner structure with low emission and staged combustion.
The burner structure includes: the fuel gas burner comprises a central air inlet pipe 1, a lateral air inlet pipe 2 sleeved outside the central air inlet pipe 1, a main gas pipe 3 arranged inside the central air inlet pipe 1, a peripheral fuel distribution branch pipe 4 and a fuel ring cavity 5; moreover, the central air inlet pipe 1, the lateral air inlet pipe 2, the main gas pipe 3 and the fuel ring chamber 5 are all coaxially arranged.
The main gas pipe 3 is communicated with the fuel ring chamber 5 through the peripheral fuel distribution branch pipe 4, the peripheral fuel distribution branch pipe 4 can be provided with a plurality of circumferentially and uniformly distributed pipes, and the fuel ring chamber 5 is positioned at the air outlet end of the central air inlet pipe 2; the outer annular surface of the fuel ring cavity 5 is provided with a plurality of inclined fuel branch pipes 6 which are uniformly distributed, and the axial end surface of the fuel ring cavity 5 is provided with a plurality of peripheral fuel injection holes 9 and a plurality of inner peripheral fuel injection holes 10 which are uniformly distributed.
The central air inlet pipe 1 and the lateral air inlet pipes 2 are used for naturally inducing air, so that air enters from the air inlet end and is discharged from the air outlet end, and the air is guided to the hearth of the boiler. The main gas pipe 3 is used for sending gas into the fuel ring chamber 5 through the peripheral fuel distribution branch pipe 4, and spraying the gas to the boiler furnace through the inclined fuel branch pipe 6, the peripheral fuel injection holes 9 and the inner fuel injection holes 10, and mixing the gas with air uniformly and burning the gas.
Optionally, in some embodiments, the oblique fuel branch pipes 6 are obliquely directed to the peripheral direction of the central air inlet pipe 1, that is, the central lines of the oblique fuel branch pipes 6 and the central air inlet pipe 1 have a certain oblique angle; the peripheral fuel injection holes 9 are obliquely directed to the peripheral direction of the central air inlet pipe 1, namely, the central line of the peripheral fuel injection holes 9 and the central line of the central air inlet pipe 1 have a certain inclination angle; the inner wall fuel injection holes 10 are inclined to point to the center direction of the central air inlet pipe 1, namely, the center line of the inner wall fuel injection holes 10 and the center line of the central air inlet pipe 1 have a certain inclination angle.
Optionally, in some embodiments, an air swirling device is disposed inside the inner annular surface of the fuel ring chamber 5 in the central air inlet pipe 1, the air swirling device includes a plurality of air swirling vanes 7, and a central axial air passage 8 is disposed in the center of the air swirling device.
Further, the air swirling device further comprises a cylindrical connecting piece 11 positioned in the center of the central air inlet pipe 1, and the center of the cylindrical connecting piece 11 is hollow to form the central axial air channel 8.
Further, the inner end of the air swirl vane 7 is connected to the cylindrical connecting piece 11, and the outer end is connected to the inner annular surface of the fuel ring chamber 5.
In this embodiment, air enters from the central air inlet pipe 1 and the lateral air inlet pipe 2, and flows out from the four stages of air channels to the combustion area. Wherein, a part of the air entering the central air inlet pipe 1 flows through the central axial air channel 8 to form a primary air channel, a part of the air flows through the gaps between the air swirl vanes 7 to form a secondary air channel, and a part of the air flows through the annular seam between the outer annular surface of the fuel annular chamber 5 and the inner wall of the central air inlet pipe 1 to form a tertiary air channel; and air entering the lateral air inlet pipe 2 flows through the lateral air inlet pipe 2 and flows out from the air outlet end to form a four-stage air channel.
In this embodiment, the fuel gas flows through the fuel distribution branch pipe 4 through the main fuel gas pipe 2, enters the fuel ring chamber 5, is divided into three parts, and flows out to the combustion area.
The first part of the fuel gas flows through the inner fuel injection holes 10 to be injected, and is mixed with the air flowing through the secondary air channel to form a mixed gas, and then the mixed gas is combusted near the central downstream of the combustor to form a primary flame area. The air in the mixed gas is excessive and is used for oxygen enrichment combustion so as to reduce the temperature of the flame area. In addition, part of air enters the central position of the flame through the primary air channel and is used for cooling the central temperature of the flame, reducing the temperature of the primary flame area and reducing the generation of nitrogen oxides. In addition, because the air flows through the air swirl blades 7 of the secondary air channel, swirl air is generated, the length of flame is shortened under the action of the swirl air, a flame stabilizing area is formed, the stability and the reliability of the fuel gas are ensured, and the fuel gas and the air are mixed more uniformly and are combusted more fully under the action of the swirl air.
The second part of fuel gas flows through the peripheral fuel injection holes 9 to be sprayed out, and is mixed with air flowing through the tertiary air channel to form mixed gas, and then the mixed gas enters the downstream to form a secondary flame area. The air in the mixed gas is excessive and is used for oxygen enrichment combustion so as to reduce the temperature of the flame area. In addition, the unburnt mixed gas in the primary flame area enters the secondary flame area due to the cyclone effect and then continues to burn, so that the flame is fully developed and forms a stable combustion state.
The third part of fuel gas is sprayed out from the inclined fuel branch pipe 6 and is mixed with air flowing through the four-stage air channel to form mixed gas, and then the mixed gas is combusted to form a three-stage flame area. Due to the effect of the swirling fuel gas, part of air flowing through the secondary air channel is sucked, the air of the mixed gas is excessive and is in oxygen-enriched combustion, and the combustion temperature is relatively low due to the combustion of over-lean fuel. In addition, unburned gas in the combustion of the secondary flame area also enters the tertiary combustion area under the action of outward rotational flow, so that the combustion is more sufficient, and the gas combustion efficiency is improved.
In addition, the air flowing through the four-stage air channel controls the shape and the range of the flame at the downstream of the combustor by forming an axial air ring; each combustion area is subjected to the swirling action of each stage to generate a mixing effect and a shearing effect, so that violent substance and heat transfer is performed, and a stable and efficient combustion area is formed together.
Optionally, in some embodiments, as an optimized scheme, the number of the air swirl vanes 7 is 8 to 16, and the swirl angle is 20 to 60 °.
Optionally, in some embodiments, as an optimized solution, the number of the inclined fuel branch pipes 6 is 6 to 20, and the inclination angle is 15 ° to 60 °.
Optionally, in some embodiments, as an optimized solution, the number of the peripheral fuel injection holes 9 is 3 to 20, and the inclination angle is 10 to 60 °.
Optionally, in some embodiments, as an optimized solution, the number of the inner peripheral fuel injection holes 10 is 2 to 20, and the inclination angle is 10 ° to 60 °.
Above, combine the attached drawing, the natural induced air gas burner structure of a low emission sectional combustion that the embodiment of the utility model provides has been explained in detail.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
(1) the mixing of air and fuel gas is enhanced, so that the mixing is more uniform, the combustion efficiency is improved, and the thermal efficiency of the boiler is increased;
(2) the flame length is reduced, and the flame is prevented from scouring the bottom plate of the boiler;
(3) sectional combustion is adopted, and the generation of nitrogen oxides is reduced;
(4) the swirl type stable flame ensures the stability of the flame, thereby ensuring the reliable and stable work of the burner, reducing the risk of backfire and improving the safety of the burner in the use process;
(5) the flame area is divided into three parts, so that efficient combustion is realized, the flame temperature is reduced, and the tail flue gas temperature and the emission of nitrogen oxides of the boiler are reduced.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (6)
1. The utility model provides a natural induced air gas burner structure of low emission segmentation burning which characterized in that includes:
the fuel gas burner comprises a central air inlet pipe (1), a lateral air inlet pipe (2) coaxially sleeved on the outer side of the central air inlet pipe (1), and a main fuel gas pipe (3), peripheral fuel distribution branch pipes (4) and a fuel ring cavity (5) which are arranged in the central air inlet pipe (1);
the main gas pipe (3) is communicated with the fuel ring cavity (5) through the peripheral fuel distribution branch pipe (4), and the fuel ring cavity (5) is positioned at the air outlet end of the central air inlet pipe (1) and is coaxially arranged with the central air inlet pipe (1);
the fuel ring cavity is characterized in that a plurality of inclined fuel branch pipes (6) are uniformly distributed on the outer annular surface of the fuel ring cavity (5), and a plurality of peripheral fuel injection holes (9) and a plurality of inner peripheral fuel injection holes (10) are uniformly distributed on the axial end surface of the fuel ring cavity (5).
2. The low-emission staged-combustion natural draft gas burner structure as claimed in claim 1,
the inclined fuel branch pipe (6) is obliquely pointed to the peripheral direction of the central air inlet pipe (1);
the peripheral fuel injection holes (9) are obliquely directed to the peripheral direction of the central air inlet pipe (1);
the inner wall fuel injection holes (10) are obliquely directed to the center direction of the central air inlet pipe (1).
3. The low-emission staged-combustion natural draft gas burner structure as claimed in claim 2,
an air swirling device which is positioned on the inner side of the inner ring surface of the fuel ring cavity (5) is arranged in the central air inlet pipe (1), the air swirling device comprises a plurality of air swirling blades (7), and a central axial air channel (8) is arranged in the center of the air swirling device.
4. The low-emission staged-combustion natural draft gas burner structure as claimed in claim 3,
the air cyclone device also comprises a cylindrical connecting piece positioned in the center of the central air inlet pipe (1), and the center of the cylindrical connecting piece is hollow to form the central axial air channel (8);
the inner end of the air swirl vane (7) is connected to the cylindrical connecting piece, and the outer end of the air swirl vane is connected to the inner annular surface of the fuel ring chamber (5).
5. The low-emission staged-combustion natural draft gas burner structure as claimed in claim 3,
a part of air entering the central air inlet pipe (1) flows through the central axial air channel (8) to form a primary air channel, a part of air flows through gaps among the air swirl vanes (7) to form a secondary air channel, and a part of air flows through a circular seam between the outer annular surface of the fuel ring chamber (5) and the inner wall of the central air inlet pipe (1) to form a tertiary air channel;
and air entering the lateral air inlet pipe (2) flows through the lateral air inlet pipe (2) and flows out from the air outlet end to form a four-stage air channel.
6. The natural draft gas burner structure of low emission staged combustion as recited in any one of claims 3 to 5,
the number of the air swirl blades (7) is 8-16, and the swirl angle is 20-60 degrees;
the number of the inclined fuel branch pipes (6) is 6-20, and the inclination angle is 15-60 degrees;
the number of the peripheral fuel injection holes (9) is 3-20, and the inclination angle is 10-60 degrees;
the number of the inner fuel injection holes (10) is 2-20, and the inclination angle is 10-60 degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021709127.8U CN212777338U (en) | 2020-08-17 | 2020-08-17 | Natural induced air gas burner structure with low-emission sectional combustion |
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| CN202021709127.8U CN212777338U (en) | 2020-08-17 | 2020-08-17 | Natural induced air gas burner structure with low-emission sectional combustion |
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| CN212777338U true CN212777338U (en) | 2021-03-23 |
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| CN202021709127.8U Active CN212777338U (en) | 2020-08-17 | 2020-08-17 | Natural induced air gas burner structure with low-emission sectional combustion |
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