CN219389722U - Premixed combustion backfire-preventing cyclone low-nitrogen burner - Google Patents

Abstract

The utility model relates to the technical field of combustors, and discloses a premixed combustion backfire-preventing cyclone low-nitrogen combustor, wherein a mixing air cylinder comprises an air cylinder air inlet end and an air cylinder air outlet end; the gas inlet end of the gas mixing cylinder is provided with a gas pipe, a plurality of gas branch pipes are arranged at positions, close to the top end, of the gas pipe, a plurality of nozzles are arranged on the gas branch pipes, and a swirl plate is arranged at the position, close to the top end, of the gas pipe; the air outlet end of the air cylinder of the mixing air cylinder is connected with a fire outlet head, and the fire outlet head comprises a plurality of rings and a plurality of fire stopping rings; the rings are conical, and the diameter of each ring is different; the annular rings are coaxially sleeved with each other at intervals; the fire stopping rings are arranged in gaps between adjacent rings and are in a fold shape; a plurality of air outlet channels are formed between the ring and the fire stopping ring. The fire stop ring structure has good heat conductivity and ablation resistance, and the flame contact surface is ablated to a certain depth, so that tempering cannot occur.

Description

Premixed combustion backfire-preventing cyclone low-nitrogen burner

Technical Field

The utility model belongs to the technical field of the combustor, concretely relates to premix burning anti-backfire whirl low nitrogen combustor.

Background

The national environmental protection policy is becoming stricter, and the emission requirements on nitrogen oxides of the boiler are also becoming higher; for combustion of fuel gas, the generation mechanism of NOx is mainly thermal, namely when the flame temperature is high enough, N2 covalent bonds can be broken to obtain free N ions, the free N ions are combined with oxygen atoms to form NOx, a large amount of NOx can be generated in the boiler combustion process, the surface combustion and the premixed combustion are the technical scheme for effectively reducing the generation of NOx at present, and the combination of the surface combustion and the premixed combustion technology can effectively reduce the generation of NOx. But the surface combustion mainly adopts an orifice plate structure or wire mesh surface combustion. The defects of the pore plate structure are complex in processing, nonuniform in combustion, poor in nitrogen reduction effect and easy to block; the main disadvantage of the wire mesh structure is that the wire mesh is easy to be blocked due to small pores, and the wire mesh is easy to be ablated after long-time use, so that the combination of the surface combustion technology and the premixed combustion technology still has the potential safety hazard of tempering deflagration, and the potential safety hazard is greatly threatened for safe production.

Disclosure of Invention

The purpose of the utility model is that: aims to provide a premixed combustion backfire-preventing swirl low-nitrogen burner which is used for improving the surface combustion performance, reducing backfire risk and inhibiting NOX generation due to channel division flame.

In order to achieve the technical purpose, the technical scheme adopted by the novel device is as follows:

a premixed combustion backfire-preventing cyclone low-nitrogen burner comprises a fire outlet head and a mixing air cylinder:

the mixing inflator comprises an inflator air inlet end and an inflator air outlet end which are respectively used for air inlet and air outlet; the gas inlet end of the gas mixing cylinder is provided with a gas pipe, a plurality of gas branch pipes are circumferentially and uniformly arranged at the position, close to the top end, of the gas pipe, a plurality of nozzles are arranged on the gas branch pipes, and a swirl plate is arranged at the position, close to the top end, of the gas pipe; the air outlet end of the air cylinder of the mixing air cylinder is connected with a fire outlet head, and the fire outlet head comprises a plurality of rings and a plurality of fire stopping rings; the rings are conical, one end is large and the other end is small, the diameters of the rings are different, and the shapes of the rings are similar; the annular rings are coaxially sleeved with each other at intervals; the fire stopping rings are arranged in gaps between adjacent rings and are in a fold shape; a plurality of air outlet passages which are sealed independently are formed between the ring and the fire stop ring.

Further, the number of loops is one more than the number of firestop loops.

Further, the number of the rings is 4, and the number of the fire stopping rings is 3.

Further, the firestop ring comprises a plurality of top surfaces and bottom surfaces; the top surface of the fire stop ring is tightly attached to the ring with larger diameter in the adjacent ring; the bottom surface of the fire stop ring is tightly attached to the ring with smaller diameter in the adjacent rings.

Further, the loops are coaxially arranged, and the spacing between adjacent loops is the same.

Further, the distance between the adjacent rings is 2mm-5mm.

Further, the fire outlet head comprises a central fire outlet plate, and the central fire outlet plate is arranged at the central position of the air outlet end of the fire outlet head; the surface of the central fire outlet plate is provided with a plurality of vent holes.

Further, the vent holes are uniformly formed in the central fire outlet plate, and the distances between the adjacent vent holes are the same.

Further, one end of the fire outlet head with a larger diameter is fixedly connected with one end of the mixed gas cylinder, which is discharged by the gas outlet pipe; and the diameter of the end ring with larger diameter of the fire outlet head is consistent with the aperture of the air outlet end of the mixing air cylinder.

Further, the number of the gas branch pipes is consistent with the number of the swirl vane blades.

The utility model adopting the technical scheme has the following advantages:

1. the size of the pores in the fire stop ring is proper, the blocking is difficult, the nitrogen reducing effect is good, and the gas can be better mixed and combusted, so that the combustion efficiency and the heat energy utilization rate are improved. But also reduces the impact and friction of the gas, thereby reducing the mechanical impact and abrasion to the inside of the burner and prolonging the service life of the burner.

2. The structure has good thermal conductivity and ablation resistance, and the flame contact surface is ablated to have a certain depth, so that tempering cannot occur, the flame contact surface is matched with the central flame outlet plate for use, heat transfer occurs between central combustion flame and peripheral combustion areas, so that the whole combustion area is combusted more fully and more stably, the safety of premixed combustion is further improved, and the generation of NOx is reduced.

Drawings

The utility model can be further illustrated by means of non-limiting examples given in the accompanying drawings;

FIG. 1 is a perspective view of a premix combustion flashback resistant swirl low nitrogen burner of the present utility model;

FIG. 2 is a top view of a premix combustion flashback resistant swirl low nitrogen burner of the present utility model;

FIG. 3 is a partial view of a flame head in a premixed combustion flashback-resistant swirl low-nitrogen burner of the present utility model;

FIG. 4 is a cross-sectional view of a premix burn flashback resistant swirl low nitrogen burner of the present utility model;

FIG. 5 is a schematic flow field diagram of a premix combustion flashback prevention swirl low nitrogen burner of the present utility model.

The main reference numerals are as follows:

a fire head 100; a loop 101; a firestop ring 102; a center fire exit plate 103; a vent 104; an outlet channel 105; a mixing cylinder 200; swirl plate 201; a nozzle 202.

Detailed Description

The present utility model will be described in detail below with reference to the drawings and the specific embodiments, wherein like or similar parts are designated by the same reference numerals throughout the drawings or the description, and implementations not shown or described in the drawings are in a form well known to those of ordinary skill in the art. In addition, directional terms such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc. in the embodiments are merely directions with reference to the drawings, and are not intended to limit the scope of the present utility model.

As shown in fig. 1 to 5, a premixed combustion flashback-preventing cyclone low-nitrogen burner includes a flame-out head 100 and a mixing cylinder 200:

the mixing air cylinder 200 comprises an air cylinder air inlet end and an air cylinder air outlet end, which are respectively used for air inlet and air outlet; the gas pipe is arranged at the center of the mixing gas cylinder 200 close to the gas inlet end of the gas cylinder, a plurality of gas branch pipes are uniformly arranged on the surface of the gas pipe close to the top end in the circumferential direction, and the distances between the adjacent gas branch pipes are the same; a plurality of nozzles 202 are arranged on each gas branch pipe, and swirl plates 201 are arranged at the top end of the gas pipe; the air outlet end of the mixing air cylinder 200 is connected with the fire outlet head 100, and the fire outlet head 100 comprises a plurality of rings 101 and a plurality of fire stopping rings 102; the ring 101 is cone-shaped, and one end is large and the other end is small, specifically, the ring diameter of one side of the ring 101 close to the air inlet end of the air cylinder 200 of the mixed air cylinder is smaller than the ring diameter of one side of the ring 101 far away from the air inlet end of the air cylinder 200 of the mixed air cylinder; but the diameter of each ring 101 is different and the shape is similar; the rings 101 are coaxially sleeved with each other at intervals; it is worth noting that the top-to-bottom height of each loop 101 is equal; the fire stop rings 102 are arranged in gaps between the adjacent rings 101, and the fire stop rings 102 are in a fold shape; a plurality of air outlet passages 105 which are sealed independently from each other are formed between the ring 101 and the firestop ring 102.

In some embodiments, the number of loops 101 is one more than the number of firestop rings 102, that is, firestop rings 102 are always disposed between adjacent loops 101. By this arrangement, the cross-sectional area of each of the independently sealed gas outlet passages 105 can be ensured to be substantially the same, so that the gas can flow more smoothly, and the mixing of different gases can be facilitated, thereby improving the mixing efficiency and reducing the generation of NOx.

In some embodiments, as one preference, the number of loops 101 is 4 and the number of firestop rings 102 is 3. During combustion, the peripheral combustion area and the central combustion area are subjected to heat exchange continuously, so that the combustion effect is better, the combustion is more stable, and the safety of the premixed combustion tempering-resistant cyclone low-nitrogen burner is improved.

In some embodiments, each firestop ring 102 comprises a plurality of top and bottom surfaces; the top surface of the fire stop ring 102 is tightly attached to the ring 101 with larger diameter in the adjacent rings 101; the bottom surface of the firestop ring 102 is closely attached to the smaller diameter ring 101 of the adjacent rings 101. Preferably, the width of each top surface of the same firestop ring 102 is the same and the width of each bottom surface of the same firestop ring 102 is the same. Because the top and bottom surfaces are in close proximity to the larger and smaller diameter annular rings 101, respectively, of the adjacent annular rings 101, flame propagation between the annular rings 101 may be limited, thereby controlling the shape and location of the flame so that it remains inside the burner head. By controlling the shape and the position of the flame, the fuel in the combustion head can be better mixed and combusted, the combustion efficiency is improved, and the energy waste is reduced. Meanwhile, the widths of the top surface and the bottom surface of each fire stop ring 102 are the same, so that flames can be uniformly controlled and stabilized in the fire stop rings 102, unstable flame and drifting are avoided, and the safety and stability of combustion are ensured.

In some embodiments, the loops 101 are arranged coaxially between the loops 101, with the spacing between adjacent loops 101 being the same. It should be noted that, the space between adjacent loops 101 is the width of the air outlet channel 105, and the same space between adjacent loops 101 indicates that the width of the air outlet channel 105 is uniform. By the arrangement, the flow of the mixed gas in each air outlet channel 105 is close, so that the mixed gas is more fully and uniformly combusted and is more stable.

In some embodiments, the spacing between adjacent loops 101 is 2mm-5mm. Preferably, the spacing between adjacent loops 101 is maintained at 2-3mm, with better results. At this time, the gap size is more appropriate, so that not only the gas circulation is smoother, but also the generation of NOx after combustion can be reduced.

In some embodiments, the fire head 100 includes a central fire exit plate 103, the central fire exit plate 103 being disposed at a central location of the air exit end of the fire head 100; the surface of the central fire outlet plate 103 is provided with a plurality of vent holes 104. In some embodiments, the ventilation holes 104 are uniformly arranged on the center fire plate 103, and the spacing between adjacent ventilation holes 104 is the same. In this way, a stable central flame is formed, the mixing degree of fuel and air is increased, and the combustion is more sufficient, so that the combustion efficiency and the heat energy utilization rate are improved. The production of unburned fuel and pollutants is reduced, thereby reducing emissions NOx.

In some embodiments, the larger end of the circle diameter of the fire head 100 is fixedly connected with the air outlet end of the mixing air cylinder 200; the diameter of one end of the fire head 100 with larger diameter is consistent with the aperture of one end of the mixing air cylinder 200 for air outlet; the fire head 100 is placed in the barrel of the mixing cylinder 200. Since the flame-out head 100 and the mixing cylinder 200 have the same aperture size, the fuel and air can be sufficiently mixed and burned in the annular space of the flame-out head 100, so that the combustion can be more uniform and stable.

In some embodiments, the number of gas manifolds is consistent with the number of blades of the swirler 201. By the arrangement, the premixing effect can be improved, so that air and fuel gas are mixed more fully, combustion flame is more stable during combustion, and combustion safety is further improved.

In some embodiments, the outlet channel 105 is angled with respect to the longitudinal cross-section of the mixing cartridge 200. Preferably, the gas outlet channel 105 in the same fire stop ring 102 has the same inclination angle as the longitudinal section of the mixing cylinder 200. It is further preferred that the gas outlet passages 105 in different firestop rings 102 have the same inclination angle as the longitudinal section of the gas cylinder 200. This helps to guide the gas flow uniformly in the gas outlet channel 105, thereby reducing drag and turbulence generated when the gas flows. The gas outlet channel 105 forms a certain angle with the longitudinal section of the mixing cylinder 200, so that the gas can flow more smoothly, and different gases can be mixed, thereby improving the mixing efficiency. The same inclination of the longitudinal section of the gas outlet channel 105 in the same fire stop ring 102 and the gas mixing cylinder 200 ensures that the flow of gas at different positions is similarly affected. The inclination angles of the longitudinal sections of the gas outlet channels 105 in different fire stop rings 102 are the same as those of the gas mixing cylinder 200, so that the gas mixing effect in the different gas outlet channels 105 is more consistent, and the mixing efficiency and performance of the whole system are improved.

In some embodiments, the outlet channel 105 is inclined at 15 ° to the longitudinal section of the mixing cylinder 200. By the arrangement, the direction and the speed of the gas flow are changed, so that the gas can be better mixed and combusted, and the combustion efficiency and the heat energy utilization rate are improved. But also reduces the impact and friction of the gas, thereby reducing the mechanical impact and abrasion to the inside of the burner and prolonging the service life of the burner.

When the mixing device is used, firstly, the nozzle sprays fuel gas into the mixing air cylinder 200, meanwhile, air flows in from one air inlet end of the mixing air cylinder 200, the fuel gas and the air are mixed in the mixing air cylinder 200, and the mixed gas obtains better mixing effect through the strengthening effect of the swirl plate. Next, the mixture flows out through the gas outlet passage 105 of the gas outlet head 100, forming a main flame. The main flame is forced to rotate due to the action of the firestop ring 102, further enhancing the combustion effect.

In addition, the central part of the flame outlet head 100 of the burner is provided with a central flame outlet plate, and a plurality of vent holes are formed on the surface of the central flame outlet plate, and a small amount of mixed gas flows out from the central flame outlet plate through the vent holes to play a role in stabilizing flame. The smaller width of the outlet channels 105 facilitates the thermal efficiency and stability of the burner. In addition, due to the slit cooling self-extinguishing effect, the burner can avoid flame tempering during working, and the safety of the burner is ensured. In use, combustion air is supplied into the mixing cylinder 200.

The premixed combustion tempering-resistant cyclone low-nitrogen burner provided by the utility model is described in detail above. The description of the specific embodiments is only intended to aid in understanding the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. The premixed combustion tempering-resistant cyclone low-nitrogen burner comprises a flame outlet head (100) and a mixing air cylinder (200), and is characterized in that:

the mixing air cylinder (200) comprises an air cylinder air inlet end and an air cylinder air outlet end which are respectively used for air inlet and air outlet; the gas inlet end of the mixing gas cylinder (200) is provided with a gas pipe, a plurality of gas branch pipes are circumferentially and uniformly arranged at the position, close to the top end, of the gas pipe, a plurality of nozzles (202) are arranged on the gas branch pipes, and a swirl plate (201) is arranged at the position, close to the top end, of the gas pipe; the air outlet end of the air cylinder of the mixing air cylinder (200) is connected with the fire outlet head (100), and the fire outlet head (100) comprises a plurality of rings (101) and a plurality of fire stopping rings (102); the rings (101) are conical, the ends of the rings are larger and the ends of the rings are smaller, the diameters of the rings (101) are different, and the rings are similar in shape; the rings (101) are coaxially sleeved with each other at intervals; the fire stop rings (102) are arranged in gaps between adjacent rings (101), and the fire stop rings (102) are in a fold shape; a plurality of air outlet passages (105) which are sealed independently are formed between the ring (101) and the fire stop ring (102).

2. The premix combustion flashback resistant swirl low nitrogen burner of claim 1, wherein:

the number of rings (101) is one more than the number of fire-stop rings (102).

3. The premix combustion flashback resistant swirl low nitrogen burner of claim 2, wherein:

the number of the rings (101) is 4, and the number of the fire stopping rings (102) is 3.

4. A premix combustion flashback arrestor swirl low nitrogen burner as in claim 3, wherein:

the firestop ring (102) comprises a plurality of top surfaces and bottom surfaces; the top surface of the fire stop ring (102) is tightly attached to the ring (101) with larger diameter in the adjacent ring (101); the bottom surface of the fire stop ring (102) is tightly attached to the ring (101) with smaller diameter in the adjacent rings (101).

5. The premixed combustion flashback-preventing swirl low-nitrogen burner according to claim 4, wherein:

the loops (101) are coaxially arranged, with the spacing between adjacent loops (101) being the same.

6. The premixed combustion flashback-preventing swirl low-nitrogen burner according to claim 5, wherein:

the spacing between adjacent loops (101) is 2mm-5mm.

7. The premixed combustion flashback-preventing swirl low-nitrogen burner according to claim 6, wherein:

the fire outlet head (100) comprises a central fire outlet plate (103), and the central fire outlet plate (103) is arranged at the central position of the air outlet end of the fire outlet head (100); the surface of the central fire outlet plate (103) is provided with a plurality of vent holes (104).

8. The premix combustion flashback resistant swirl low nitrogen burner of claim 7, wherein:

the vent holes (104) are uniformly formed in the central fire outlet plate (103), and the distances between the adjacent vent holes (104) are the same.

9. The premix combustion flashback resistant swirl low nitrogen burner of claim 8, wherein:

one end of the fire outlet head (100) with larger circle diameter is fixedly connected with one end of the mixed gas cylinder (200) for air outlet; and the diameter of one end of the fire outlet head (100) with larger diameter is consistent with the diameter of one end of the mixing air cylinder (200) with air outlet.

10. The premix combustion flashback resistant swirl low nitrogen burner of claim 9, wherein:

the number of the gas branch pipes is consistent with the number of blades of the cyclone sheet (201).