CN212227021U - Low-nitrogen combustor - Google Patents

Low-nitrogen combustor Download PDF

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Publication number
CN212227021U
CN212227021U CN202020780869.3U CN202020780869U CN212227021U CN 212227021 U CN212227021 U CN 212227021U CN 202020780869 U CN202020780869 U CN 202020780869U CN 212227021 U CN212227021 U CN 212227021U
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China
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gas
main
distribution pipe
peripheral
rotational flow
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CN202020780869.3U
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Inventor
林继铭
李浩蓁
张勇
杨建红
房怀英
张锋
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Huaqiao University
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Huaqiao University
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Abstract

The utility model discloses a low-nitrogen burner, the gas injection mechanism divide into the fuel and is located the center and from the main fuel district of gas main nozzle blowout and is located around and from the peripheral fuel district of the supplementary venthole blowout of annular outlet duct, partial combustion air mixes with the gas in main fuel district and forms the central combustion district, partial combustion air mixes with the gas in peripheral fuel district and forms peripheral combustion district, can restrain the formation of nitrogen oxide through peripheral combustion district, and combustion temperature is lower, play the emission effect that reduces nitrogen oxide equally; and the annular air outlet pipe is provided with a plurality of groups of auxiliary air outlet holes which are annularly arranged, so that the temperature of the peripheral combustion area is more uniform, and the local high temperature is avoided. Under the effect of whirl mechanism, form the negative pressure in central burning zone, guarantee the timely backward flow of high temperature flue gas, let the burning more abundant, strengthen the flame disturbance, improve combustion efficiency.

Description

Low-nitrogen combustor
Technical Field
The utility model relates to a low-nitrogen burner.
Background
In recent years, the economic growth of China is rapid, the energy consumption is remarkably improved, and the problem of environmental pollution caused by the energy consumption is increasingly severe. The environmental protection department in China has higher and higher requirements on the emission limit of pollutants generated by combustion. For this reason, reducing nitrogen oxide emissions is one of the main goals of current gas burner designs.
At present, the gas burner using natural gas as fuel in China is greatly developed. Compared with coal and oil burners, the natural gas burner has the advantages of safety, high efficiency, simple and convenient operation and low pollutant discharge. However, the gas burner which is not optimally designed still generates more nitrogen oxides due to insufficient mixing of fuel and air, so that the NOx emission of the natural gas burner still has a great room for improvement, and a plurality of technical means for reducing the emission of pollutants are yet to be developed. There is still a need to design a more rational and efficient low-nitrogen burner design to effectively reduce combustion and control pollutant emissions.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low-nitrogen burner, which overcomes the defects of the background technology. The utility model provides a technical scheme that its technical problem adopted is:
a low-nitrogen burner comprising:
a hollow combustion cylinder;
the gas injection mechanism is fixedly connected in the combustion cylinder and comprises a hollow injection body, a gas main distribution pipe, a plurality of peripheral gas distribution pipes and an annular gas outlet pipe, wherein the gas main distribution pipe is positioned in the center of the injection body, one end of the gas main distribution pipe is connected with the gas inlet channel, the other end of the gas main distribution pipe is provided with a gas main nozzle, the peripheral gas distribution pipes are arranged around the gas main distribution pipe at intervals, one end of each peripheral gas distribution pipe is communicated with the gas main distribution pipe, the other end of each peripheral gas distribution pipe is communicated with the annular gas outlet pipe, the annular gas outlet pipe is positioned outside the peripheral gas distribution pipes and is coaxially arranged with the gas main distribution pipes, and the annular gas outlet pipe is; and
the rotational flow mechanism is positioned between the main fuel gas distribution pipe and the peripheral fuel gas distribution pipe and comprises a rotational flow body, a plurality of rotational flow blades and a rotational flow outer ring, the rotational flow body is fixedly sleeved outside the main fuel gas distribution pipe, the plurality of rotational flow blades are arranged outside the rotational flow body at intervals in an annular mode, one end of each rotational flow blade is fixedly connected to the periphery of the rotational flow body, and the other end of each rotational flow blade is fixedly connected with the rotational flow outer ring.
In a preferred embodiment: the cyclone body is also provided with a plurality of small slotted holes which penetrate through the front and the back.
In a preferred embodiment: the height of the cyclone body is smaller than that of the cyclone outer ring, and an included angle between each cyclone blade and a radial projection surface of each cyclone blade is 25-60 degrees.
In a preferred embodiment: and an included angle between the swirl vane and a radial projection surface of the swirl vane is 35 degrees.
In a preferred embodiment: the top end surface of the cyclone body is in a circular truncated cone shape, the diameter of the cyclone body is gradually increased from bottom to top, and the small slotted hole extends from bottom to top along the top end surface of the cyclone body.
In a preferred embodiment: the height of the annular gas outlet pipe is greater than that of the main gas nozzle.
In a preferred embodiment: the top end face of the gas main distribution pipe is provided with an end face main nozzle, the top end face of the gas main distribution pipe is also provided with a boss, the side face of the boss is provided with a side face main nozzle, and the end face main nozzle and the side face main nozzle form the gas main nozzle.
In a preferred embodiment: the end face main nozzles are provided with a plurality of groups which are arranged at intervals from the center to the edge, and the aperture of the main nozzle from the center to the edge is gradually increased; the aperture of the side main nozzle is smaller than that of the end surface main nozzle.
In a preferred embodiment: every group's supplementary venthole all is annular interval arrangement, and from the center to the supplementary venthole aperture grow gradually of border.
In a preferred embodiment: the top end of the injection body is also provided with a horn-shaped diffusion cover, the diffusion cover is positioned on the outer side of the annular air outlet pipe, and the diffusion cover is provided with a plurality of groups of air circulation holes.
Compared with the background technology, the technical scheme has the following advantages:
1. the fuel is divided into a main fuel area which is positioned in the center and is sprayed out from the main fuel nozzle and a peripheral fuel area which is positioned on the periphery and is sprayed out from the auxiliary air outlet holes of the annular air outlet pipe by the fuel gas spraying mechanism, part of combustion-supporting air is mixed with the fuel gas in the main fuel area to form a central combustion area, and part of combustion-supporting air is mixed with the fuel gas in the peripheral fuel area to form a peripheral combustion area; and the annular air outlet pipe is provided with a plurality of groups of auxiliary air outlet holes which are annularly arranged, so that the temperature of the peripheral combustion area is more uniform, and the local high temperature is avoided. Under the effect of whirl mechanism, form the negative pressure in central burning zone, guarantee the timely backward flow of high temperature flue gas, let the burning more abundant, strengthen the flame disturbance, improve combustion efficiency.
2. The whirl body still is equipped with a plurality of and cracks the aperture, should crack the aperture and can strengthen the mixture of gas and air, improves the perturbative nature of combustion air flow to form the aerodynamic field that is favorable to lasting burning in the burning barrel, thereby realize the flash ignition of gas, and last, stable, abundant burning.
3. The height of the rotational flow body is smaller than that of the rotational flow outer ring, and an included angle between the rotational flow blade and a radial projection surface of the rotational flow blade is 25-60 degrees, so that the effect of generating negative pressure by the rotational flow mechanism is better.
4. The height of the annular gas outlet pipe is larger than that of the main gas nozzle to form a stepped structure so as to keep stable combustion of the central combustion area, and meanwhile, the residual products of combustion of the central combustion area can also flow to the peripheral combustion area for secondary combustion, so that the combustion of the gas is more sufficient, and the emission of nitrogen oxides is further reduced.
5. The end face main nozzle and the side face main nozzle form a gas main nozzle, and the number of the main nozzles is large, the arrangement is reasonable, the generated flames cannot be accumulated together in a concentrated mode, the flame propagation speed is improved, and the combustion efficiency is improved.
6. The diffusion cover is provided with a plurality of groups of air circulation holes, the air circulation holes are beneficial to mixing of fuel gas and air, local high temperature is avoided, emission of nitrogen oxides is reduced, meanwhile, the trumpet-shaped diffusion cover enables fluid movement to be more compact, resistance borne by air flow in flowing is increased, and therefore distribution of the flow is changed; the peripheral air can be contracted towards the center of the burner 4, and the radiation of high temperature to the burner is reduced.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic assembly diagram of a gas injection mechanism and a swirling mechanism.
Fig. 2 is a schematic diagram showing the overall structure of the gas injection mechanism.
Fig. 3 is a schematic structural diagram of the swirling mechanism.
Fig. 4 shows a schematic structural view of the combustion cylinder.
Fig. 5 is a schematic view showing the overall structure of the low-nitrogen burner.
Detailed Description
Referring to fig. 1 to 5, a preferred embodiment of a low-nitrogen burner includes a hollow combustion cylinder 10, a gas injection mechanism 20, and a swirling mechanism 30.
As shown in fig. 4, the combustion cylinder 10 includes an upper cylinder 11 and a lower cylinder 12, the upper cylinder 11 is connected to the lower cylinder 12 through a step surface 13, and the diameter of the upper cylinder 11 is larger than that of the lower cylinder 12. The bottom opening of the lower cylinder 12 is an air inlet, i.e. an air inlet for air and fuel gas, and the top opening of the upper cylinder 11 is an air outlet for combustion products.
The gas injection mechanism 20 is fixedly connected in the combustion cylinder 10 and comprises a hollow injection body 21, a gas main distribution pipe 22, a plurality of peripheral gas distribution pipes 23 and an annular gas outlet pipe 24, the gas main distribution pipe 22 is positioned at the center of the injection body 21, one end of the gas main distribution pipe is connected with the gas inlet channel 1, the other end of the gas main distribution pipe is provided with a gas main nozzle, the peripheral gas distribution pipes 23 are arranged around the gas main distribution pipe 22 at intervals, one end of each peripheral gas distribution pipe 23 is communicated with the gas main distribution pipe 22, the other end of each peripheral gas distribution pipe is communicated with the annular gas outlet pipe 24, the annular gas outlet pipe 24 is positioned outside the peripheral gas distribution pipes 23 and is coaxially arranged with the gas main distribution pipes 22, and the annular gas outlet pipe 24 is provided.
In this embodiment, the height of the annular outlet pipe 24 is greater than the height of the main gas nozzle to form a stepped structure, so as to maintain stable combustion in the central combustion area, and meanwhile, the residual products of combustion in the central combustion area can also flow to the peripheral combustion area for secondary combustion, so that combustion of gas is more sufficient, and emission of nitrogen oxides is further reduced.
In this embodiment, the end surface main nozzle 221 is disposed on the top end surface of the gas main distribution pipe 22, the boss 222 is further disposed on the top end surface of the gas main distribution pipe 22, the side surface of the boss 222 is provided with the side surface main nozzle 223, and the end surface main nozzle 221 and the side surface main nozzle 223 form the gas main nozzle. The end surface main nozzles 221 and the side surface main nozzles 223 form gas main nozzles, and due to the fact that the number of the main nozzles is large and the layout is reasonable, generated flames cannot be accumulated together in a concentrated mode, the flame propagation speed is improved, and the combustion efficiency is improved.
In this embodiment, the end surface main nozzles 221 are provided with a plurality of groups and are arranged at intervals from the center to the edge, and the aperture of the main nozzle from the center to the edge is gradually increased; the aperture of the side surface main nozzle 223 is smaller than that of the end surface main nozzle.
In this embodiment, each group of auxiliary air outlets 25 are arranged at intervals in a ring shape, and the aperture of each auxiliary air outlet 25 gradually increases from the center to the edge. Because the air content at the edge is higher, the aperture of the auxiliary air outlet 25 close to the edge is larger, the mixing ratio of air and fuel gas can be increased, and the combustion is more sufficient.
In this embodiment, the top end of the injection body 21 is further provided with a flared diffusion cover 26, the diffusion cover 26 is located outside the annular air outlet pipe 24, and the diffusion cover 26 is provided with a plurality of groups of air circulation holes 27. As shown in fig. 2, the air flow holes 27 are provided in two sets, one set is located outside the diffusion cover 26, the other set is located inside the diffusion cover 26, and the aperture of the air flow hole 27 located inside the diffusion cover 26 is larger than that of the air flow hole 27 located outside the diffusion cover 26, so as to ensure that enough air enters the injection body 21 to better mix with the fuel gas in the auxiliary air outlet 25, avoid local high temperature, and reduce the emission of nitrogen oxides. Preferably, the angle between the inner side of the diffuser shroud 26 and the central axis is 22.5 degrees. As shown in fig. 5, the middle portion of the diffuser cover 26 corresponds to the stepped surface 13 of the combustion cylinder 10.
The swirl mechanism 30 is located between the main gas distribution pipe 22 and the peripheral gas distribution pipe 23 and comprises a swirl body 31, a plurality of swirl blades 32 and a swirl outer ring 33, the swirl body 31 is fixedly sleeved outside the main gas distribution pipe 22, the plurality of swirl blades 32 are annularly arranged outside the swirl body 31 at intervals, one end of each swirl blade 32 is fixedly connected to the periphery of the swirl body 31, and the other end of each swirl blade 32 is fixedly connected with the swirl outer ring 33.
In this embodiment, the rotational flow body 31 is further provided with a plurality of small slit holes 34 penetrating front and back. The cyclone body 31 is further provided with a plurality of slotted small holes 34, the slotted small holes 34 can enhance the mixing of gas and air, improve the turbulence of combustion airflow, and form an aerodynamic field favorable for continuous combustion in the combustion cylinder 10, so that the rapid ignition of the gas is realized, and the gas is continuously, stably and fully combusted. As shown in fig. 3, the slit aperture 34 is long, a through hole 35 is opened at the center of the swirling flow body 31, the slit apertures 34 are annularly arranged at the periphery of the through hole 35 at intervals, and the gas main distribution pipe 22 is sleeved in the through hole 35.
In this embodiment, the top end surface of the cyclone body 31 is in a truncated cone shape, the diameter of the top end surface of the cyclone body 31 is gradually increased from the bottom to the top, and the slotted small hole 34 extends from the bottom to the top along the top end surface of the cyclone body 31. Preferably, the included angle between the top end face of the swirling body 31 and the central axis is 45 degrees.
In this embodiment, the height of the swirling body 31 is smaller than the height of the swirling outer ring 33, and the included angle between the swirling blades 32 and the radial projection surface is 25-60 degrees, so that the effect of generating negative pressure by the swirling mechanism 30 is better.
In this embodiment, the included angle between the swirl vane 32 and the radial projection surface is 35 degrees.
The fuel gas injection mechanism 20 divides the fuel into a main fuel area which is positioned in the center and is sprayed out from the main fuel nozzle of the fuel gas and a peripheral fuel area which is positioned at the periphery and is sprayed out from the auxiliary air outlet 25 of the annular air outlet pipe 24, part of combustion-supporting air is mixed with the fuel gas in the main fuel area to form a central combustion area, and part of combustion-supporting air is mixed with the fuel gas in the peripheral fuel area to form a peripheral combustion area; and, annular outlet duct 24 is equipped with a plurality of sets of auxiliary ventholes 25 that arrange annularly, can make the temperature in peripheral burning zone more even, avoids local high temperature to appear. Under the effect of whirl mechanism 30, form the negative pressure in central burning district, guarantee the timely backward flow of high temperature flue gas, let the burning more abundant, strengthen the flame disturbance, improve combustion efficiency.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims (10)

1. A low-nitrogen burner, characterized by: it includes:
a hollow combustion cylinder;
the gas injection mechanism is fixedly connected in the combustion cylinder and comprises a hollow injection body, a gas main distribution pipe, a plurality of peripheral gas distribution pipes and an annular gas outlet pipe, wherein the gas main distribution pipe is positioned in the center of the injection body, one end of the gas main distribution pipe is connected with the gas inlet channel, the other end of the gas main distribution pipe is provided with a gas main nozzle, the peripheral gas distribution pipes are arranged around the gas main distribution pipe at intervals, one end of each peripheral gas distribution pipe is communicated with the gas main distribution pipe, the other end of each peripheral gas distribution pipe is communicated with the annular gas outlet pipe, the annular gas outlet pipe is positioned outside the peripheral gas distribution pipes and is coaxially arranged with the gas main distribution pipes, and the annular gas outlet pipe is; and
the rotational flow mechanism is positioned between the main fuel gas distribution pipe and the peripheral fuel gas distribution pipe and comprises a rotational flow body, a plurality of rotational flow blades and a rotational flow outer ring, the rotational flow body is fixedly sleeved outside the main fuel gas distribution pipe, the plurality of rotational flow blades are arranged outside the rotational flow body at intervals in an annular mode, one end of each rotational flow blade is fixedly connected to the periphery of the rotational flow body, and the other end of each rotational flow blade is fixedly connected with the rotational flow outer ring.
2. A low-nitrogen burner according to claim 1, wherein: the cyclone body is also provided with a plurality of small slotted holes which penetrate through the front and the back.
3. A low-nitrogen burner according to claim 1, wherein: the height of the cyclone body is smaller than that of the cyclone outer ring, and an included angle between each cyclone blade and a radial projection surface of each cyclone blade is 25-60 degrees.
4. A low-nitrogen burner according to claim 3, wherein: and an included angle between the swirl vane and a radial projection surface of the swirl vane is 35 degrees.
5. A low-nitrogen burner according to claim 2, wherein: the top end surface of the cyclone body is in a circular truncated cone shape, the diameter of the cyclone body is gradually increased from bottom to top, and the small slotted hole extends from bottom to top along the top end surface of the cyclone body.
6. A low-nitrogen burner according to claim 1, wherein: the height of the annular gas outlet pipe is greater than that of the main gas nozzle.
7. A low-nitrogen burner according to claim 6, wherein: the top end face of the gas main distribution pipe is provided with an end face main nozzle, the top end face of the gas main distribution pipe is also provided with a boss, the side face of the boss is provided with a side face main nozzle, and the end face main nozzle and the side face main nozzle form the gas main nozzle.
8. A low-nitrogen burner according to claim 7, wherein: the end face main nozzles are provided with a plurality of groups which are arranged at intervals from the center to the edge, and the aperture of the main nozzle from the center to the edge is gradually increased; the aperture of the side main nozzle is smaller than that of the end surface main nozzle.
9. A low-nitrogen burner according to claim 1, wherein: every group's supplementary venthole all is annular interval arrangement, and from the center to the supplementary venthole aperture grow gradually of border.
10. A low-nitrogen burner according to claim 1, wherein: the top end of the injection body is also provided with a horn-shaped diffusion cover, the diffusion cover is positioned on the outer side of the annular air outlet pipe, and the diffusion cover is provided with a plurality of groups of air circulation holes.
CN202020780869.3U 2020-05-12 2020-05-12 Low-nitrogen combustor Active CN212227021U (en)

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Application Number Priority Date Filing Date Title
CN202020780869.3U CN212227021U (en) 2020-05-12 2020-05-12 Low-nitrogen combustor

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Application Number Priority Date Filing Date Title
CN202020780869.3U CN212227021U (en) 2020-05-12 2020-05-12 Low-nitrogen combustor

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112984508A (en) * 2021-02-24 2021-06-18 西安交通大学 Hydrogen injection type ammonia low-nitrogen cyclone burner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112984508A (en) * 2021-02-24 2021-06-18 西安交通大学 Hydrogen injection type ammonia low-nitrogen cyclone burner

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