CN218328133U

CN218328133U - Multi-fuel low-nitrogen combustor

Info

Publication number: CN218328133U
Application number: CN202222582875.XU
Authority: CN
Inventors: 周治
Original assignee: Jiangsu Shengnuo Environmental Technology Co ltd
Current assignee: Jiangsu Shengnuo Environmental Technology Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-01-17
Anticipated expiration: 2032-09-27

Abstract

The utility model discloses a low nitrogen burner of many fuels, including shell, fuel line and air hose, the air hose sets up with one heart in the shell, and its outer wall with the inner wall of shell forms flue gas passageway, the fuel line includes the person in charge and the intercommunication a plurality of branch pipes of being responsible for that set up with the air hose with one heart, the inner wall of being responsible for outer wall and air hose forms air duct, air duct and flue gas passageway intercommunication, the front portion of shell is equipped with contraction section, front end and is equipped with the shrink mouth, be equipped with annular hybrid chamber in the contraction section, backflow mouth, inboard be equipped with the discharge port are seted up to the front side of hybrid chamber, be equipped with the swirler in the shell, the swirler can the back-and-forth movement and be used for adjusting the front and back position of water conservancy diversion, the advantage of comparing with prior art lies in: the low-nitrogen combustion can be carried out by adapting to various fuels.

Description

Multi-fuel low-nitrogen combustor

Technical Field

The utility model relates to a combustor technical field specifically indicates a many fuel low NOx burner.

Background

A burner can be defined as a device that converts a substance into heat energy by a chemical reaction, combustion, according to the principle of operation of the burner. With the improvement of national requirements on energy conservation and environmental protection, the energy conservation and environmental protection technology is continuously developed, the atmospheric environmental pollution is continuously and deeply treated, and the NOx emission requirements of various combustors are increasingly strict. Therefore, the combustion performance requirement of the combustor is also improved from the pure requirement on combustion efficiency and energy consumption to the combustion efficiency and index energy consumption under the low-nitrogen environment-friendly requirement. The current major low-nitrogen combustion technologies include staged combustion, flameless combustion, flue gas recirculation, premixed combustion, and the like. The technical route mainly focuses on lowering the combustion temperature, reducing the residence time of the reactants and thus reducing the thermal NOx formation.

For low nitrogen combustion using a technique of flue gas recirculation, refer to patent publication nos.: CN216953057U patent name: the patent provides a burner, wherein a refractory brick on a cylinder opening of a combustion cylinder is provided with a flue gas backflow hole; and patent publication nos.: CN205504983U patent name: the utility model provides a low nitrogen burner of flue gas recirculation in combustion-supporting wind injection type stove, this patent has proposed a combustor, and it sets up the interior pressure mouth of round annular blade on the surface of deepening furnace inside outside the combustion head shell, carries out the suction of flue gas through this pressure mouth, and both realize low nitrogen burning through the form of flue gas backward flow reburning. However, it can be seen that the flue gas backflow structures of the two are fixed, so that the size of the swirl region of the flue gas backflow is also fixed, the amount of the flue gas backflow cannot be regulated, and the adaptability of different types of fuels cannot be adjusted, so that the low-nitrogen combustion effect is finally deteriorated. In view of the above-mentioned drawbacks, the inventors propose a multi-fuel low-nitrogen burner.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome above technical defect, provide a many fuel low NOx burner.

The design provides a multi-fuel low-nitrogen combustor, which comprises a shell, a fuel pipe and an air pipe, wherein the air pipe is concentrically arranged in the shell, the outer wall of the air pipe and the inner wall of the shell form a flue gas channel, the fuel pipe comprises a main pipe concentrically arranged with the air pipe and a plurality of branch pipes communicated with the main pipe, the outer wall of the main pipe and the inner wall of the air pipe form an air channel, the air channel is communicated with the flue gas channel, the front part of the shell is provided with a contraction section, the front end of the shell is provided with a contraction opening, flue gas backflow can be realized in the form of the contraction opening, an annular mixing cavity is arranged in the contraction section, the front side of the mixing cavity is provided with a backflow opening, the inner side of the mixing cavity is provided with a discharge opening, the backflow opening can receive backflow flue gas and form a vortex area in the mixing cavity, a swirler is arranged in the shell, the swirler can move forwards and backwards and forwards and backwards and forwards, so as to adjust the front and backwards position of combustion air, namely, the size of the vortex area can be controlled, and the backflow amount of the flue gas can be controlled.

Furthermore, the flue gas passageway L shape passageway, be equipped with a vertical section rather than the intercommunication on the shell, the flue gas passageway passes through vertical section intercommunication low temperature flue gas source, and low temperature flue gas can mix and then reduce the oxygen content and realize the low nitrogen burning with the air.

Further, optimize gas and air and admit air, make the rear end of air pipe runs through the vertical section sets up, and the fixed end cover that is equipped with.

Furthermore, the peripheral surface of the air pipe is provided with a plurality of through air holes.

Furthermore, a combustion head is fixedly arranged at the front end of the main pipe, the connecting parts of the branch pipes and the main pipe are positioned at the rear side of the combustion head, and the staged combustion mode is also favorable for realizing low-nitrogen combustion.

Furthermore, the front ends of the branch pipes are fixedly communicated with a distribution ring pipe, and the distribution ring pipe is provided with fuel nozzles.

Furthermore, the front end of the contraction section is in a throat shape contracting forwards, and a barrier ring contracting backwards is fixedly arranged in the contraction section.

Furthermore, the backflow port is a plurality of fan-shaped hollows which are uniformly distributed at the front end of the contraction section in the circumferential direction.

Furthermore, the swirler includes a mounting ring and a plurality of vortex vanes, and a plurality of vortex vanes are installed on the inner wall of the mounting ring.

Furthermore, the cyclone is connected with the shell or the air pipe in a front-back sliding manner, a connecting rod is fixedly arranged on the cyclone, and the connecting rod extends backwards and is driven by a linear module to perform linear motion.

After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the utility model preferentially leads the flue gas to flow back and return to the mixing cavity to be mixed with combustion-supporting air according to different gas components, and the flue gas is mixed with fuel to burn after reducing the oxygen content, thereby achieving the purpose of low-nitrogen burning; the size of the smoke reflux can be controlled according to the front and back positions of the adjusting cyclone, and the ratio of low-temperature smoke to combustion air can be adjusted to meet the low-nitrogen combustion requirements of different gases, so that the application range is wide, and the environment-friendly effect is good.

Drawings

Fig. 1 is a schematic perspective view of a multi-fuel low-nitrogen burner according to the present invention.

Fig. 2 is a schematic structural diagram of a multi-fuel low-nitrogen burner of the present invention.

Fig. 3 is a schematic perspective view of the multi-fuel low-nitrogen burner with the detached housing.

Fig. 4 is a schematic perspective view of a multi-fuel low-nitrogen burner swirler according to the present invention.

Fig. 5 is a schematic view of the intake of a multi-fuel low-nitrogen burner of the present invention.

As shown in the figure: 1. the fuel nozzle comprises a shell, 2, a fuel pipe, 3, an air pipe, 4, a flue gas channel, 5, a main pipe, 6, a branch pipe, 7, an air channel, 8, a contraction section, 9, a contraction opening, 10, a mixing cavity, 11, a backflow opening, 12, an exhaust opening, 13, a swirler, 14, a vertical section, 15, an end cover, 16, an air hole, 17, a combustion head, 18, a flame stabilizing disc, 19, a distribution ring pipe, 20, a fuel nozzle, 21, a blocking ring, 22, a mounting ring, 23, a vortex blade, 24 and a connecting rod.

Detailed Description

The following description is only for the preferred embodiment of the present invention, and the protection scope of the present invention is not limited thereby, the present invention will be further explained with reference to the drawings and the embodiments.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Example 1, see FIGS. 1-5:

the present embodiment provides a multi-fuel low-nitrogen burner, which comprises a housing 1, a fuel pipe 2 and an air pipe 3. Wherein the housing 1 and the air tube 3 are concentrically nested. In the scheme, the fuel inlet is used as the back, the fuel is sprayed out as the front, namely a shell is arranged at the back end of the shell 1, and the shell is a vertical section 14 which is vertical to the shell 1 and is used for introducing low-temperature flue gas. The air tube 3 is fixedly connected with the vertical section 14 shell, the rear end of the air tube is provided with an end cover 15, and the end cover 15 is provided with an air inlet nozzle. A plurality of air holes 16 for mixing the gas are opened on the peripheral side of the air tube 3. It can be seen from the figure that the air pipe 3 is fed with combustion air, and the outer wall of the air pipe 3 and the inner wall of the housing 1 form a flue gas channel 4.

The fuel pipe 2 is used for introducing fuel, and includes a main pipe 5 concentrically arranged with the air pipe 3 and six branch pipes 6 communicating with the main pipe 5. A straight-through flame stabilizing disc 18 is arranged at the front end of the main pipe 5, and a cylindrical combustion head 17 is arranged around the flame stabilizing disc 18. As can be seen from the drawings, six branch pipes 6 are connected to the front portion of the fuel pipe 2 and are arranged forward in parallel with the main pipe 5, and the burner head 17 is fixed to the six branch pipes 6 by snap fittings. For this embodiment, the main pipe 5 is used as the primary combustion and the branch pipe 6 is used as the secondary combustion. And an air channel 7 is formed between the main pipe 5 and the air pipe 3, and the air channel 7 can mix smoke and finally converge to a combustion head 17 to be mixed with fuel, and finally the mixture is combusted. In the secondary combustion, a distribution ring pipe 19 is additionally arranged on the branch pipe 6, a forward fuel nozzle 20 is arranged on the distribution ring pipe 19, and fuel is injected through the branch pipe 6 to carry out secondary combustion.

In order to reflux and mix the smoke, a contraction section 8 is arranged at the front part of the shell 1, and a contraction opening 9 is arranged at the front end of the shell. The constriction 9 is in the form of a forward converging throat disposed at the front end of the burner head 17, and in this embodiment, the angle between the taper and the horizontal is 155 °, and when high temperature flue gas passes through the constriction 9, a vortex is generated, and generally a swirl plate for recirculation is provided to enable recirculation of the flue gas.

In order to control the smoke backflow amount in the scheme, a mixing cavity 10 is arranged at the front part of the shell 1, the front side of the mixing cavity 10 depends on a step formed by the contraction section 8, the rear side of the mixing cavity depends on an annular blocking ring 21 to be used as a blocking part, and an opening at the inner side is opened to be used as an exhaust port 12. The obtuse included angles between the steps at the front ends of the blocking ring 21 and the contraction section 8 and the horizontal line are both 105 degrees, and the front side of the contraction section 8 is provided with a fan-shaped return opening 11 for sucking smoke. When the burner burns, a vortex negative pressure area is formed at the mixing cavity 10, a pressure difference is formed at the inner side and the outer side of the return opening 11, and high-temperature flue gas is curled.

In order to be able to control the amount of flue gas recirculation, a cyclone 13 is provided in the housing 1. The swirler 13 includes a mounting ring 22 and a plurality of swirl vanes 23, and the swirl vanes 23 are mounted on the inner wall of the mounting ring 22. A plurality of parallel optical axes are arranged on the peripheral side of the housing 1, and are slidably connected with the mounting ring 22 through the optical axes. A connecting rod 24 is fixedly arranged on the mounting ring 22, the connecting rod 24 extends backwards and penetrates through the end cover 15, and linear motion can be carried out by connecting a linear module (not shown) at the rear side. Meanwhile, combustion air and low-temperature flue gas are mixed and then are guided out by the cyclone 13, so that a negative pressure area is arranged at the rear end of the cyclone 13 and can suck the high-temperature flue gas, and the suction mixing speed of the high-temperature flue gas can be controlled by changing the front position and the rear position of the cyclone 13, namely the guide suction speed is faster in the forward direction. This therefore allows the flue gases to flow back more quickly and to be mixed with combustion air before being burnt with the fuel.

This device need be according to the gas of difference, and the limited high temperature flue gas that lets returns to mixing chamber 10 in the backward flow district to mix through water conservancy diversion and combustion-supporting air, reduce oxygen content back and gas co-combustion, and then reach the low nitrogen burning. Meanwhile, when the fuel changes and the low-nitrogen combustion cannot be achieved only through the backflow of the smoke in the furnace, the low-nitrogen combustion can be achieved by adjusting the ratio of the low-temperature smoke to the combustion-supporting air and matching with the backflow of the high-temperature smoke.

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims

1. The utility model provides a many fuel low NOx burner, includes shell (1), fuel pipe (2) and air pipe (3), its characterized in that: the air pipe (3) is concentrically arranged in the shell (1), the outer wall of the air pipe and the inner wall of the shell (1) form a flue gas channel (4), the fuel pipe (2) comprises a main pipe (5) concentrically arranged with the air pipe (3) and a plurality of branch pipes (6) communicated with the main pipe (5), the outer wall of the main pipe (5) and the inner wall of the air pipe (3) form an air channel (7), the air channel (7) is communicated with the flue gas channel (4), the front part of the shell (1) is provided with a contraction section (8), the front end of the shell is provided with a contraction port (9), an annular mixing cavity (10) is arranged in the contraction section (8), a backflow port (11) is formed in the front side of the mixing cavity (10), an exhaust port (12) is formed in the inner side of the mixing cavity, a swirler (13) is arranged in the shell (1), and the swirler (13) can move back and forth and back and forth positions for adjusting backflow flue gas flow guiding.

2. A multi-fuel low-nitrogen burner as claimed in claim 1, wherein: the flue gas passageway (4) L shape route, be equipped with a vertical section (14) rather than the intercommunication on shell (1), flue gas passageway (4) pass through vertical section (14) intercommunication low temperature flue gas source.

3. A multi-fuel low-nitrogen burner as claimed in claim 2, wherein: the rear end of the air pipe (3) penetrates through the vertical section (14) and is fixedly provided with an end cover (15).

4. A multi-fuel low-nitrogen burner as claimed in claim 3, wherein: the peripheral surface of the air pipe (3) is provided with a plurality of through air holes (16).

5. A multi-fuel low-nitrogen burner as claimed in claim 1, wherein: the front end of the main pipe (5) is fixedly provided with a combustion head (17), and the joints of the branch pipes (6) and the main pipe (5) are positioned at the rear side of the combustion head (17).

6. A multi-fuel low-nitrogen burner as claimed in claim 5, wherein: the front ends of the branch pipes (6) are fixedly communicated with a distribution ring pipe (19), and the distribution ring pipe (19) is provided with a fuel nozzle (20).

7. A multi-fuel low-nitrogen burner as claimed in claim 1, wherein: the front end of the contraction section (8) is in a throat shape contracting forwards, and a blocking ring (21) contracting backwards is fixedly arranged in the contraction section.

8. A multi-fuel low-nitrogen burner as claimed in claim 1, wherein: the backflow port (11) is a plurality of fan-shaped hollows which are uniformly distributed at the front end of the contraction section (8) in the circumferential direction.

9. A multi-fuel low-nitrogen burner as claimed in claim 1, wherein: the swirler (13) comprises a mounting ring (22) and a plurality of vortex blades (23), wherein the plurality of vortex blades (23) are mounted on the inner wall of the mounting ring (22).

10. A multi-fuel low-nitrogen burner as claimed in claim 9, wherein: the cyclone (13) is connected with the shell (1) or the air pipe (3) in a front-back sliding mode, a connecting rod (24) is fixedly arranged on the cyclone, and the connecting rod (24) extends backwards and is driven to move linearly through a linear module.