CN217356877U

CN217356877U - Take hierarchical low NOx burner that gas jetted

Info

Publication number: CN217356877U
Application number: CN202220884639.0U
Authority: CN
Inventors: 刘永才; 王绥德; 张龙; 黄世峰; 高鲁斌
Original assignee: Shenzhen Jiayuntong Electronics Co Ltd
Current assignee: Daqing Jiayuntong Petroleum Equipment Development Co ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-09-02
Anticipated expiration: 2032-04-18

Abstract

The utility model discloses a hierarchical low-nitrogen burner with gas injection, which comprises an air inlet channel and a coaxial gas fuel air inlet channel, wherein the air inlet channel is sleeved outside the coaxial gas fuel air inlet channel and is coaxially arranged with the coaxial gas fuel air inlet channel, and a three-level low-nitrogen combustion structure is arranged in the air inlet channel; the utility model relates to the technical field of burners, which increases the high-speed injection of peripheral gas fuel, leads the downstream smoke gas to flow back and mix with the gas fuel, reduces the flame temperature and reduces the generation of oxynitride; the central gas fuel is sprayed out from the central gas nozzle and is subjected to diffusion combustion, so that the flame is more stable; the grading of atmosphere and fuel is formed, a multi-stage flame is formed, and the flame temperature is reduced, so that the emission of nitrogen oxides is greatly reduced.

Description

Take hierarchical low NOx burner that gas jetted

Technical Field

The utility model relates to a combustor technical field specifically is a take gas to draw hierarchical low NOx burner who penetrates.

Background

With the development of society, environmental issues are increasingly receiving wide attention from international design. The emission standards of heating equipment such as boilers are becoming more and more stringent. Due to the increasing emission requirements of national policy and the large volume of applications of various gaseous fuels, the development of low nox burners has created a need for energy conservation and environmental protection.

The burner is an important component of an industrial boiler and is the main device for releasing fuel energy into heat energy. With the increasingly strict environmental requirements, the gas fuel burner which belongs to clean combustion is also widely applied. The nozzle structure of the gas fuel burner plays a decisive role in the emission of pollutants generated in the combustion process, and the design and the processing level of the nozzle structure of the burner determine the combustion load required in production and the safe and stable boiler operation.

The existing burners mostly adopt diffusion type combustion, in order to ensure the full combustion of fuel, the burners generally adopt a design mode of better mixing fuel and atmosphere, but the mode has concentrated flame, very high combustion temperature and very large emission value of oxynitride. In order to reduce nitrogen oxides, ensure sufficient combustion of fuel and ensure stable and safe operation of a combustor, in view of the above problems, the present invention has been developed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to prior art not enough, the utility model provides a take gas to draw hierarchical low NOx burner who penetrates has solved current background technical problem.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the graded low-nitrogen combustor with the fuel gas injection comprises an air inlet channel and a coaxial gas fuel air inlet channel, wherein the air inlet channel is sleeved outside the coaxial gas fuel air inlet channel and is coaxially arranged with the coaxial gas fuel air inlet channel, and a three-level low-nitrogen combustion structure is arranged in the air inlet channel;

the tertiary low-nitrogen combustion structure includes: the device comprises a primary gas fuel pipe, a secondary gas fuel branch pipe, a plurality of tertiary gas fuel branch pipes, a coaxial fluid director, a rotary flow guiding disc, a plurality of driving fan blades and a plurality of jet combustion holes;

the end of the coaxial gas fuel inlet channel is provided with a first-stage gas fuel pipe, the end of the first-stage gas fuel pipe is annularly provided with a second-stage gas fuel branch pipe, the joint of the coaxial gas fuel inlet channel and the first-stage gas fuel pipe is annularly provided with a plurality of third-stage gas fuel branch pipes which are communicated with the inlet channel, the first-stage gas fuel pipe is externally sleeved with a coaxial fluid director, a rotary flow deflector is arranged in the coaxial fluid director and sleeved outside the first-stage gas fuel pipe, a plurality of driving fan blades are arranged on the rotary flow deflector, and the end of the first-stage gas fuel pipe is provided with a plurality of flame spraying holes.

Preferably, the primary gas fuel pipe is arranged coaxially with the coaxial gas fuel inlet passage and the diameter of the coaxial gas fuel inlet passage is larger than the diameter of the primary gas fuel pipe.

Preferably, the end parts of the three-stage gas fuel branch pipes are connected with a plurality of peripheral gas fuel ejectors.

Preferably, the end part of the coaxial fluid director is provided with a cone mouth section with a cone mouth type structure.

Preferably, the coaxial fluid director and the air inlet channel are not closed, and the secondary gas fuel branch pipe penetrates through the annular wall surface of the coaxial fluid director.

Preferably, a flow guide bell mouth is arranged at the end part of the air inlet channel.

Advantageous effects

The utility model provides a take hierarchical low NOx burner that gas jetted. The method has the following beneficial effects:

(1) peripheral gas fuel high-speed injection is added, so that downstream smoke gas backflow is mixed with the gas fuel, the flame temperature is reduced, and the generation of nitrogen oxides is reduced;

(2) the central gas fuel is sprayed out from the central gas nozzle and is subjected to diffusion combustion, so that the flame is more stable;

(3) the grading of atmosphere and fuel is formed, a multi-stage flame is formed, and the flame temperature is reduced, so that the emission of nitrogen oxides is greatly reduced.

Drawings

Fig. 1 is a main view structure schematic diagram of a graded low-nitrogen combustor with gas injection.

Fig. 2 is a side view structure diagram of a hierarchical low-nitrogen burner with gas injection.

Fig. 3 is a sectional axonometric view of a hierarchical low-nitrogen burner with gas injection.

In the figure: 1. an air intake passage; 2. a coaxial gas fuel inlet passage; 3. a flow guiding bell mouth; 4. a coaxial fluid director; 5. a primary gas fuel line; 6. a tertiary gas fuel branch pipe; 7. a peripheral gaseous fuel injector; 8. a secondary gaseous fuel branch; 9. a spray combustion hole; 10. rotating the diversion disc; 11. driving the fan blades; 12. a cone opening section.

Detailed Description

All the electrical components in the present application are connected with the power supply adapted to the electrical components through a wire, and an appropriate controller and an appropriate encoder should be selected according to actual conditions to meet control requirements, and specific connection and control sequences should be obtained.

Example (b): 1-3, a staged low-nitrogen burner with gas injection comprises an air inlet channel 1; a coaxial gas fuel inlet channel 2, a three-stage gas fuel branch pipe 6, a primary gas fuel pipe 5, a coaxial fluid director 4, a secondary gas fuel branch pipe 8 and a rotary flow deflector 10 are sequentially arranged in the gas inlet channel 1;

the coaxial gas fuel inlet channel 2, the primary gas fuel pipe 5 and the gas inlet channel 1 are coaxially arranged; the tail end of the coaxial gas fuel inlet channel 2 is connected with a primary gas fuel pipe 5 and is connected with a tertiary gas fuel branch pipe 6; the primary gas fuel pipe 5 comprises central radial flame spray holes 9 which are uniformly distributed at the end part and is connected with a secondary gas fuel branch pipe 8 and a rotary flow guide plate 10; the above-mentioned

A peripheral gas fuel ejector 7 is arranged coaxially downstream of the three-stage gas fuel branch pipe 6; the coaxial fluid director 4 is coaxial with the coaxial gas fuel inlet channel 2

Setting; the coaxial fluid director 4 comprises a conical mouth section 12 of the coaxial fluid director 4; the rotary flow guide disc 10 comprises driving fan blades 11 which are arranged coaxially with the coaxial gas fuel inlet channel 2; the air inlet channel 1 comprises a flow guiding bell mouth 3.

The air inlet channel 1 and the coaxial fluid director 4 are used for a channel through which the atmosphere flows and guiding the atmosphere to a boiler hearth, and the coaxial gas fuel air inlet channel 2

A channel for gaseous fuel to enter the burner, directing the gaseous fuel to the boiler furnace.

The atmosphere enters the burner from the air inlet channel 1, and is divided into two parts after flowing through the coaxial fluid director 4. One part of the air flows into the coaxial fluid director 4 and is divided into two atmospheric flows, the first atmospheric flow forms first-level atmospheric air after flowing out through the driving fan blade 11 of the rotary diversion disk 10, and the second atmospheric flow forms second-level atmospheric air after flowing out through the annular gap between the outer edge of the rotary diversion disk 10 and the coaxial fluid director 4; and the other part of atmosphere enters the combustor through a channel between the air inlet channel 1 and the coaxial fluid director 4 to form tertiary atmosphere.

The gas fuel enters the coaxial gas fuel intake passage 2 and is divided into two parts. The first part of the gas fuel is divided into two gas fuels after flowing out through the primary gas fuel pipe 5, the first gas fuel is radially injected through central radial injection holes 9 evenly distributed at the end part of the primary gas fuel pipe 5, mixing with partial first-stage atmosphere, burning near the central axis of boiler furnace to form first-stage flame area, the area has less large gas amount, forms oxygen-deficient combustion, the second gas fuel is radially sprayed out through a secondary gas fuel branch pipe 8 connected with a primary gas fuel pipe 5 and then mixed with secondary atmosphere, forms a secondary flame area at the periphery of the primary flame area, because of the cyclone effect, a part of primary atmosphere is convoluted, so that the excess atmosphere is oxygen-enriched combustion, in addition, due to the swirl entrainment effect, heat exchange is formed between the primary flame area and the secondary flame area, so that the combustion stability is ensured; due to the contraction effect of the conical opening section 12 of the coaxial fluid director 4, the secondary atmosphere forms jet entrainment, so that low-temperature flue gas at the downstream is rewound to a secondary flame area, the flame combustion temperature is reduced, and the generation of oxynitride is reduced; the second part of gas fuel is ejected at high speed through the three-level gas fuel branch pipe 6 and flows into the peripheral gas fuel ejector 7, and after being mixed with part of three-level atmosphere, the second part of gas fuel develops downstream to form a three-level flame area; after flowing through the flow guider guide bell mouth 3, the tertiary atmosphere deviates from the central axis to form a peripheral atmosphere flow field expanding downstream, so that a further cooling area is formed between the tertiary flame area and the secondary flame area, the grading effect is increased, and the flame temperature and oxynitride are further reduced.

Each combustion area generates shearing action and mixing effect under the action of rotational flow, intense heat and substance transfer is carried out, and the combustion areas with high efficiency and stable effect are formed together.

As a further improvement, the number of the driving fan blades 11 is 4-10.

As a further improvement, the rotational flow angle of the outside air rotational flow device driving fan blade 11 is 20 to 60 degrees.

As a further improvement, the number of the central radial jet-combustion holes 9 is 4-10.

As a further improvement, the number of the three-stage gas fuel branch pipes 6 is 6-20.

As a further improvement, the number of the secondary gas fuel branch pipes 8 is 4-10.

Claims

1. The graded low-nitrogen combustor with the fuel gas injection comprises an air inlet channel (1) and a coaxial gas fuel air inlet channel (2), wherein the air inlet channel (1) is sleeved outside the coaxial gas fuel air inlet channel (2) and is coaxially arranged with the coaxial gas fuel air inlet channel (2), and is characterized in that a three-level low-nitrogen combustion structure is arranged in the air inlet channel (1);

the tertiary low-nitrogen combustion structure includes: the device comprises a primary gas fuel pipe (5), a secondary gas fuel branch pipe (8), a plurality of tertiary gas fuel branch pipes (6), a coaxial fluid director (4), a rotary flow guiding disc (10), a plurality of driving fan blades (11) and a plurality of flame jetting holes (9);

the end of the coaxial gas fuel inlet channel (2) is provided with a first-stage gas fuel pipe (5), the end of the first-stage gas fuel pipe (5) is annularly provided with a second-stage gas fuel branch pipe (8), the joint of the coaxial gas fuel inlet channel (2) and the first-stage gas fuel pipe (5) is annularly provided with a plurality of third-stage gas fuel branch pipes (6) to penetrate through the inlet channel (1), the outer sleeve of the first-stage gas fuel pipe (5) is provided with a coaxial fluid director (4), a rotary flow deflector (10) is arranged in the coaxial fluid director (4) and sleeved outside the first-stage gas fuel pipe (5), a plurality of driving fan blades (11) are arranged on the rotary flow deflector (10), and the end of the first-stage gas fuel pipe (5) is provided with a plurality of flame spraying holes (9).

2. The staged low-nitrogen burner with gas injection as claimed in claim 1, wherein the primary gas fuel pipe (5) is arranged coaxially with the coaxial gas fuel inlet channel (2) and the diameter of the coaxial gas fuel inlet channel (2) is larger than the diameter of the primary gas fuel pipe (5).

3. The staged low-nitrogen burner with gas injection as claimed in claim 1, wherein the ends of the three stages of gas fuel branch pipes (6) are connected with a plurality of peripheral gas fuel injectors (7).

4. The staged low-nitrogen burner with gas injection as claimed in claim 1, wherein the end of the coaxial flow guider (4) is provided with a cone section (12) with a cone-shaped structure.

5. The staged low-nitrogen burner with gas injection as claimed in claim 1, wherein the coaxial flow guider (4) is not closed with the gas inlet channel (1), and the secondary gas fuel branch pipe (8) penetrates through the annular wall surface of the coaxial flow guider (4).

6. The staged low-nitrogen burner with gas injection as claimed in claim 1, wherein a flow guide bell mouth (3) is arranged at the end of the gas inlet channel (1).