CN211739055U - Novel combustor structure of natural induced draft - Google Patents
Novel combustor structure of natural induced draft Download PDFInfo
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- CN211739055U CN211739055U CN202020278218.4U CN202020278218U CN211739055U CN 211739055 U CN211739055 U CN 211739055U CN 202020278218 U CN202020278218 U CN 202020278218U CN 211739055 U CN211739055 U CN 211739055U
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Abstract
The utility model discloses a novel combustor structure of induced air naturally, include: the gas pipe, the central air inlet pipe sleeved outside the gas pipe, and the lateral air inlet pipe sleeved outside the central air inlet pipe; an air swirling device is arranged in the central air inlet pipe and comprises a central axial air channel and peripheral air swirling blades; the gas pipe comprises a main gas pipe, a central fuel branch pipe and a plurality of peripheral fuel distribution branch pipes which are led out from the main gas pipe in a branching manner, and a peripheral fuel ring cavity connected with the plurality of peripheral fuel distribution branch pipes; the peripheral fuel ring cavity and the central fuel branch pipe are provided with jet holes; the peripheral fuel ring cavity is positioned in an annular space formed between the air swirling device and the central air inlet pipe, and the central fuel branch pipe penetrates through the central axial air channel. The utility model has the advantages of it is following: the gas staged combustion technology is applied to the natural induced air technology, the mixing of air and fuel gas is enhanced, the efficient combustion is realized, and the flame length is reduced.
Description
Technical Field
The utility model relates to a combustor technical field, concretely relates to novel combustor structure of natural induced air.
Background
The oil field heating furnace is a special equipment for oil field which is most applied in the links of processing, conveying and the like in an oil gas gathering and transferring system, has the function of heating crude oil, natural gas, oil gas mixture and the like to the temperature required by the process, meets the requirements of the oil gas gathering and transferring process and the processing process, and is an important oil field production facility. The core component of the oil field heating furnace burner is the burner, and the heat efficiency, the environmental protection emission and the like of the heating furnace depend on the burner to a great extent. In the past, neither the manufacturer of the heating furnace nor the using unit pay much attention to the research of the burner technology in the aspect of the heating furnace. One form of the burners which are matched with the oil field heating furnace at present is a natural induced draft type burner, the natural induced draft type burner is simple in structure, forced air blowing of an air blower is not needed, energy consumption is low, maintenance is convenient, operation is reliable, backfire cannot occur, and combustion is very stable. But also has some disadvantages, (1) low combustion heat intensity, long flame, and need of longer boiler hearth; (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 along with the heat loss.
The Chinese patent with the publication number of CN108386831A adopts air to be injected by a main nozzle pipeline in a multi-path way, the air is mixed with fuel to obtain premixed gas when passing through a main fuel cavity, the premixed gas is injected into a hearth through an outlet of the main nozzle, and in addition, a plurality of paths of on-duty fuel are injected into the hearth, so that the distribution of the fuel and the air in a combustion area is adjusted, the flame temperature of the combustion area is reduced, the existence of the on-duty flame enables the flame to be stable, the fuel and the air of a burner to be mixed more uniformly, and the fuel is axially combusted in a graded mode, the peak temperature of the flame is low, the optimization of a hearth temperature field is. However, 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, a reasonable mixing method is not provided, the mixing effect is poor, concentration and temperature distribution in a combustion area are not uniform, 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 novel combustor structure of nature induced air, in using the nature induced air technique with gas staged combustion technique, aim at solving the common problem of nature induced air gas combustion ware, strengthen the mixture of air and gas, realize high-efficient burning to reduce flame length.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
A novel naturally induced draft burner structure, comprising: the gas pipe, the central air inlet pipe sleeved outside the gas pipe, and the lateral air inlet pipe sleeved outside the central air inlet pipe; an air swirling device is arranged in the central air inlet pipe and comprises a central axial air channel and peripheral air swirling blades; the gas pipe comprises a main gas pipe, a central fuel branch pipe and a plurality of peripheral fuel distribution branch pipes which are divergently led out from the main gas pipe, and peripheral fuel ring cavities connected with the plurality of peripheral fuel distribution branch pipes; the peripheral fuel ring cavity and the central fuel branch pipe are provided with jet holes; the peripheral fuel ring cavity is positioned in an annular space formed between the air swirling device and the central air inlet pipe, and the central fuel branch pipe penetrates through a central axial air channel of the air swirling device.
Furthermore, the central air inlet pipe and the lateral air inlet pipe are coaxially arranged, and the central fuel branch pipe and the central axial air channel are coaxially arranged.
Furthermore, a plurality of radial fuel injection holes are formed in the tail end of the central fuel branch pipe, and a plurality of axial fuel injection holes located in the inner ring and a plurality of rotational flow fuel injection holes located in the outer ring are formed in the peripheral fuel ring cavity.
Further, the peripheral air swirl vanes and the swirl fuel injection holes have opposite swirl directions.
Furthermore, the number of the swirl fuel injection holes is 15-30, and the swirl angle is 25-60 degrees.
Furthermore, the number of the radial fuel injection holes is 3-10.
Furthermore, the number of the axial fuel injection holes is 15-30.
Furthermore, the number of the blades of the peripheral air rotational flow blade is 8-16, and the rotational flow angle is 25-60 degrees.
According to the technical scheme, the utility model has the advantages of it is following:
(1) form multistage burning, strengthen the mixture of air and gas, make the mixture more even, improve combustion efficiency, increase boiler thermal efficiency.
(2) The air rotational flow device is utilized, the rotational flow type stable flame guarantees the stability of the flame, thereby ensuring the reliable and stable work of the burner, reducing the danger of tempering and improving the safety of the burner in the use process; the length of flame is reduced, and the flame is prevented from scouring the bottom plate of the boiler.
(3) The flame area is divided into three parts, so that efficient combustion is realized, the flame temperature is reduced, and the temperature of the flue gas at the tail part of the boiler is reduced.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below.
Fig. 1 is a cross-sectional view of a burner structure according to an embodiment of the present invention;
fig. 2 is a front view of a burner structure according to an embodiment of the present invention;
fig. 3 is an internal structural view of a burner structure according to 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 will explain details by way of specific examples.
Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a novel natural draft burner structure.
The burner structure includes: the gas pipe, the central air inlet pipe 1 which is sleeved outside the gas pipe, and the lateral air inlet pipe 2 which is sleeved outside the central air inlet pipe; the gas pipe comprises a main gas pipe 3, a central fuel branch pipe 6 and a plurality of peripheral fuel distribution branch pipes 4 which are divergently led out from the main gas pipe 3, and peripheral fuel annular cavities 5 which are connected with the plurality of peripheral fuel distribution branch pipes 4; the peripheral fuel ring cavity 5 and the central fuel branch pipe 6 are both provided with jet holes; an air swirling device is arranged in the central air inlet pipe 1 and comprises a central axial air channel 8 and peripheral air swirling blades 7; the peripheral fuel ring cavity 5 is positioned in an annular space formed between the air swirling device and the central air inlet pipe 1, and the central fuel branch pipe 6 penetrates through a central axial air channel 8 of the air swirling device.
The tail end of the central fuel branch pipe 6 is provided with a plurality of radial fuel injection holes 11, and the peripheral fuel ring cavity 5 is provided with a plurality of axial fuel injection holes 10 positioned on the inner ring and a plurality of rotational flow fuel injection holes 9 positioned on the outer ring.
Alternatively, the plurality of axial fuel injection holes 10 are uniformly distributed in the circumferential direction, and the plurality of swirl fuel injection holes 9 are uniformly distributed in the circumferential direction.
Optionally, the lateral air inlet pipe 2 and the central air inlet pipe 1 are coaxially arranged, and are coaxially arranged with the main gas pipe 3 and the central fuel branch pipe 6.
Alternatively, the central fuel branch pipe 6 and the central axial air passage 8 are arranged coaxially.
Alternatively, the peripheral air swirl vanes 7 and the swirl fuel injection holes 9 have opposite swirl directions.
The utility model discloses burner structure, central air-supply line 1 and side direction air-supply line 2 are used for the nature induced air to guide the air to boiler furnace. A part of air entering from the central air inlet pipe 1 flows through the central axial air channel 8 to form primary air, a part of air flows through the peripheral air swirl vanes 7 to form secondary air, and the other part of air flows through the annular gaps on the periphery of the air swirl device to form tertiary air. The central fuel branch pipe 6 is located in the primary air passage. The air entering from the lateral air inlet duct 2 forms an axial air ring.
The utility model discloses combustor structure, gas get into through main gas pipe 3, fall into two parts. A part of fuel gas flows through the central fuel branch pipe 6, is mixed with primary air through the radial fuel injection holes 11 and then is combusted near the central axis of the boiler hearth to form a central flame area, and the fuel in the part of the mixed gas is excessive and is combusted in an oxygen-deficient mode to form a stable combustion flame which is used for stabilizing the flame of the whole flow field in the combustion process. The other part of the fuel gas enters the peripheral fuel ring cavity 5 after flowing through the peripheral fuel distribution branch pipe 4 and then is divided into two parts again, and the two parts are respectively sprayed out from the peripheral swirl fuel injection holes 9 and the axial fuel injection holes 10. The gas that from axial fuel jet orifice 10 spouts and the second grade air that flows through peripheral air whirl blade 7 mix the back and get into the low reaches and form middle injection flame region, owing to whirl air effect, shortened the length of flame and formed the flame stable region, guaranteed the stability, the reliability of gas, the whirl effect makes gas and air mix more even in addition, and the burning is more abundant. The gas ejected from the peripheral rotational flow fuel injection holes 9 is mixed with the tertiary air formed by the peripheral annular gap of the peripheral air rotational flow blades, in addition, due to the action of the rotational flow gas, part of the air entering the air inlet pipe 2 in the lateral direction is sucked, the air of the mixed gas is excessive, a peripheral premixed combustion area is formed, oxygen in the combustion area is firstly diluted by smoke before being combusted with unburnt gas, in addition, due to the combustion of the over-lean fuel, the combustion temperature is relatively low, in addition, the unburnt gas in the combustion of the middle injection flame area also enters the premixed combustion area due to the action of the outward rotational flow, the combustion is more sufficient, the combustion efficiency of the gas is improved, and in addition, due to the rotational flow action of the gas, the flame length is shortened.
In the burner structure of the embodiment of the utility model, the air entering from the lateral air inlet pipe 2 controls the shape and the range of the flame at the downstream of the burner by forming the 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.
The burner structure of the embodiment of the utility model has the following parameters.
Optionally, the number of the swirl fuel injection holes 9 is 15-30, and the swirl angle is 25-60 °.
Optionally, the number of the radial fuel injection holes 11 is 3 to 10.
Optionally, the number of the axial fuel injection holes 10 is 15 to 30.
Optionally, the number of the peripheral air swirl vanes 7 is 8-16, and the swirl angle is 25-60 °.
More than, the embodiment of the utility model discloses a novel combustor structure of induced air naturally. Compared with the prior art, the beneficial effects of the utility model include:
(1) form multistage burning, strengthen the mixture of air and gas, make the mixture more even, improve combustion efficiency, increase boiler thermal efficiency.
(2) The air rotational flow device is utilized, the rotational flow type stable flame guarantees the stability of the flame, thereby ensuring the reliable and stable work of the burner, reducing the danger of tempering and improving the safety of the burner in the use process; the length of flame is reduced, and the flame is prevented from scouring the bottom plate of the boiler.
(3) The flame area is divided into three parts, so that efficient combustion is realized, the flame temperature is reduced, and the temperature of the flue gas at the tail part of the boiler is 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 (8)
1. A novel combustor structure of nature induced air, its characterized in that includes:
the gas pipe, the central air inlet pipe sleeved outside the gas pipe, and the lateral air inlet pipe sleeved outside the central air inlet pipe;
an air swirling device is arranged in the central air inlet pipe and comprises a central axial air channel and peripheral air swirling blades;
the gas pipe comprises a main gas pipe, a central fuel branch pipe and a plurality of peripheral fuel distribution branch pipes which are divergently led out from the main gas pipe, and peripheral fuel ring cavities connected with the plurality of peripheral fuel distribution branch pipes; the peripheral fuel ring cavity and the central fuel branch pipe are provided with jet holes;
the peripheral fuel ring cavity is positioned in an annular space formed between the air swirling device and the central air inlet pipe, and the central fuel branch pipe penetrates through a central axial air channel of the air swirling device.
2. The novel natural draft burner structure of claim 1,
the central air inlet pipe and the lateral air inlet pipe are coaxially arranged, and the central fuel branch pipe and the central axial air channel are coaxially arranged.
3. The novel natural draft burner structure of claim 1,
the tail end of the central fuel branch pipe is provided with a plurality of radial fuel injection holes, and the peripheral fuel ring cavity is provided with a plurality of axial fuel injection holes positioned on the inner ring and a plurality of rotational flow fuel injection holes positioned on the outer ring.
4. The novel natural draft burner structure of claim 3,
the peripheral air swirl vanes and the swirl fuel injection holes have opposite swirl directions.
5. The novel natural draft burner structure of claim 3,
the number of the swirl fuel injection holes is 15-30, and the swirl angle is 25-60 degrees.
6. The novel natural draft burner structure of claim 3,
the number of the radial fuel injection holes is 3-10.
7. The novel natural draft burner structure of claim 3,
the number of the axial fuel injection holes is 15-30.
8. The novel natural draft burner structure of claim 1,
the number of the peripheral air swirl blades is 8-16, and the swirl angle is 25-60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020278218.4U CN211739055U (en) | 2020-03-09 | 2020-03-09 | Novel combustor structure of natural induced draft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020278218.4U CN211739055U (en) | 2020-03-09 | 2020-03-09 | Novel combustor structure of natural induced draft |
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| CN211739055U true CN211739055U (en) | 2020-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137635A (en) * | 2021-05-13 | 2021-07-20 | 中国联合重型燃气轮机技术有限公司 | On-duty fuel nozzle tip, fuel nozzle, and gas turbine |
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2020
- 2020-03-09 CN CN202020278218.4U patent/CN211739055U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137635A (en) * | 2021-05-13 | 2021-07-20 | 中国联合重型燃气轮机技术有限公司 | On-duty fuel nozzle tip, fuel nozzle, and gas turbine |
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