CN210568408U

CN210568408U - Converter gas burner with low NOx emission

Info

Publication number: CN210568408U
Application number: CN201921443754.9U
Authority: CN
Inventors: 周勇; 王英; 石艳丽; 罗飞
Original assignee: Hangzhou Boiler Group Co Ltd
Current assignee: Xizi clean energy equipment manufacturing Co.,Ltd.
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-05-19
Anticipated expiration: 2029-09-02

Abstract

The utility model discloses a low NOx discharges converter gas burner, include the burning torch passageway, central air duct, gas channel and the outer air duct of the outside coaxial setting in proper order from the central axis of combustor, spout and outer air duct's outer anchor ring are connected and extend toward the furnace direction, central air duct exit hoop sets up a plurality of central whirl blades, and gas channel separates for inside and outside two annular space in the exit, is provided with the front panel in the annular space exit, and the hoop sets up the gas orifice of a plurality of slopes on the front panel, and the hoop sets up a plurality of gas whirl blades in outer annular space, and outer air duct exit hoop sets up a plurality of outer whirl blades. The utility model discloses a reasonable structure makes gas and combustion air at center and the abundant homogeneous mixing of outer homoenergetic, utilizes flame to cut apart and has reduced the flame temperature, has avoided the appearance of local high-temperature zone, has restrained NOx's formation, has realized the purpose that low NOx discharged.

Description

Converter gas burner with low NOx emission

Technical Field

The utility model relates to a clean burning technical field of industry gas especially relates to a converter gas burner is discharged to low NOx.

Background

Converter gas is a byproduct of a steel making process of a steel enterprise, has a large production amount, contains a large amount of harmful substances such as CO, nitrogen elements and the like, and cannot be directly discharged into the atmosphere. Meanwhile, converter gas is a gas fuel with medium heat value and can be used as a fuel of an industrial boiler. High-temperature flame is generated in the combustion process of converter gas, and N in the air₂And nitrogen element in the coal gas is easy to form pollutant-nitrogen oxide NOx at high temperature. The existing converter gas burner is easy to form local overtemperature due to large gas quantity and uneven mixing with combustion air, so that NOx is generated, and increasingly strict emission requirements cannot be met. Therefore, the development of the low-NOx-emission gas burner suitable for the converter gas has great significance for reasonably utilizing the converter gas, reducing the cost of the iron and steel enterprises and assisting the iron and steel enterprises in realizing the aims of energy conservation and emission reduction.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a converter gas burner is discharged to low NOx solves the problem that present converter gas burner gas and air mix inequality, easily produce local high temperature zone, reduces combustion process NOx's formation volume.

The utility model adopts the following technical scheme:

a converter gas burner with low NOx emission comprises an ignition gun channel, a central air channel, a gas channel, an outer air channel and a nozzle, and is characterized in that the ignition gun channel, the central air channel, the gas channel and the outer air channel are sequentially and coaxially arranged from the central axis of the burner, the nozzle is connected with the outer annular surface of the outer air channel and extends towards the direction of a hearth, a plurality of central rotational flow blades are annularly arranged at the outlet of the central air channel, the gas channel is divided into an inner annular space and an outer annular space at the outlet, a front panel is arranged at the outlet of the inner annular space, a plurality of inclined gas spray holes are annularly arranged on the front panel, a plurality of gas rotational flow blades are annularly arranged in the outer annular space, and a plurality of outer rotational flow blades are annularly arranged at the outlet of the outer air channel.

Preferably, the nozzle is a contraction type conical cylinder, and the contraction angle is 3-8 degrees.

Preferably, the gas jet holes are arranged in 1-2 layers along the circumferential direction.

Preferably, the gas jet holes are round holes or other special-shaped holes.

Preferably, the gas jet holes are inclined inwards, and the included angle between the gas jet holes and the axis is 5-10 degrees.

Preferably, the swirling direction of the gas swirling vanes is opposite to that of the outer swirling vanes.

The utility model has the advantages that:

(1) the gas is sprayed out through the plurality of gas spray holes and is mixed with the air flowing out from the central air channel and the outer layer air channel to form a plurality of strands of small flames for combustion, so that the heat load concentration is avoided, the flame temperature is favorably reduced, and the formation of NOx is inhibited.

(2) The rotational flow directions of the gas rotational flow blades and the outer rotational flow blades are opposite, so that the full and uniform mixed combustion of gas and combustion air is facilitated, the generation of a local high-temperature area is avoided, and the formation of NOx is inhibited.

(3) The utility model discloses simple structure easily processes and installs.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

3 FIG. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 1 3; 3

FIG. 3 is a partial enlarged view of portion I of FIG. 2;

fig. 4 is a schematic view of the overall structure of embodiment 2 of the present invention;

FIG. 5 is a sectional view taken in the direction B-B in FIG. 4;

fig. 6 is a partially enlarged view of a portion II in fig. 5.

In the figure: 1. the gas-fired ignition gun comprises a central cyclone blade, 2, a gas spray hole, 3, a front panel, 4, a gas cyclone blade, 5, a nozzle, 6, an outer cyclone blade, 7, a gas channel, 8, an outer air channel, 9, a central air channel, 10 and an ignition gun channel.

Detailed Description

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

embodiment 1 as shown in fig. 1, 2 and 3, this embodiment provides a low NOx emission converter gas burner, the main body of which is a coaxial cylindrical structure, an ignition gun passage 10, a central air passage 9, a gas passage 7 and an outer air passage 8 are sequentially disposed outward from the central axis of the burner, a nozzle 5 is connected to the outer circumferential surface of the outer air passage and extends toward the furnace, the nozzle 5 is a convergent cone having a convergent angle of 5 ° and the ignition gun passage 10 is opened only when the boiler is started to ignite, and a flange cover is used to seal the nozzle during normal operation, the central air passage 9, the gas passage 7 and the outer air passage 8 are all annular passages, a plurality of central swirl vanes 1 are circumferentially disposed at the outlet of the central air passage 9 to enhance the diffusion capability of combustion air, so that the central combustion air and gas are more uniformly mixed, the gas passage 7 is divided into two annular spaces inside and outside at the outlet, a front panel 3 is disposed at the outlet of the inner annular space, the front panel 3 seals the outlet of the inner annular space, a plurality of inclined gas swirl vanes 2 are circumferentially disposed at the front panel 3, a plurality of swirl vanes are circumferentially disposed at the annular outlet of the gas passage 6, and a plurality of swirl orifices are disposed at the inner swirl vanes and an outer swirl outlet of the inner swirl vanes 8, and a plurality of inner swirl vanes are disposed at an inclined angle of the outer annular orifice 6.

In this embodiment, the combustion air enters the furnace chamber from two paths. One path of air is introduced from a central air channel 9 in an axial introduction mode or a circumferential introduction mode, and enters a hearth in a rotational flow mode through a central rotational flow blade 1 arranged at an outlet after introduction; the other path of air is introduced from an outer layer air channel 8, the introduction mode can be axial introduction or circumferential introduction, the introduced air enters a hearth in a rotational flow mode through an outer rotational flow blade 6 arranged at an outlet, and the combustion air flows forwards in the rotational flow and also has a tendency of flowing towards the center due to the shape oppression of a nozzle 5 which is contracted inwards from the outer side. The gas is introduced from the gas channel 7 in an axial or circumferential manner. The introduced fuel gas is divided into two paths at the outlet of the fuel gas channel 7, one path of fuel gas is sprayed into a hearth from the inner annular space through a plurality of fuel gas spray holes 2 which are annularly arranged in 2 layers in a centripetal and inclined mode, and the fuel gas collides with combustion-supporting air entering the hearth from a central rotational flow blade 1 at the outlet of a central air channel 9 in a rotational flow mode and is mixed and combusted to form a plurality of strands of small central flames; the other path enters a hearth from the outer annular space through the gas swirl blades 4 in a swirl mode, collides with combustion air entering the hearth from the outer swirl blades 6 at the outlet of the outer layer air channel 8 in a swirl mode, is mixed and then burns to form a plurality of strands of outer layer flames.

In the inner layer, the gas is sprayed out from a plurality of gas spray holes 2 which are arranged on a 2-layer ring on the front panel and collide and mix with the combustion air which enters the hearth from the central cyclone blade 1 in a cyclone mode, because the gas spray holes 2 are inclined centripetally, the gas and the combustion air are mixed more uniformly, the occurrence of a local high temperature area is avoided, meanwhile, a plurality of strands of small central flames can be formed by the plurality of gas spray holes, the heat load concentration is avoided, the radiation heat dissipation is facilitated compared with large flames, the flame temperature is reduced, and the two aspects are both favorable for inhibiting the formation of NOx; at the skin, the gas gets into furnace with the whirl mode behind gas whirl blade 4, burn after mixing with the outer combustion air who gets into furnace with the whirl mode through outer whirl blade 6, because the whirl direction of gas whirl blade 4 and outer whirl blade 6 is opposite, and outer combustion air receives the shape oppression of spout 5 internal contraction and centripetal flow, the mixture of gas and outer combustion air is more abundant, more even, combine fuel and combustion air's rational ratio, be favorable to controlling whole burning temperature distribution, avoid the appearance of local high-temperature region, thereby restrain NOx's formation.

Owing to adopted reasonable structure, the utility model discloses the abundant homogeneous mixing of gas and combustion air can be realized to the center and the outer homoenergetic at the combustor to reduce flame temperature with the technique of cutting apart flame, combine fuel and combustion air's rational ratio, can the whole burning temperature distribution of effective control, avoid the appearance of local high temperature district, thereby restrain NOx's formation, realize the purpose that low NOx discharged.

Example 2:

as shown in fig. 4, 5 and 6, the present embodiment provides a converter gas burner with low NOx emissions. Compared with embodiment 1, the present embodiment 2 is different in that 1 layer of inclined gas injection holes 2 are circumferentially provided on the front panel 3. The rest is the same as in example 1.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the claims.

Claims

1. A converter gas burner with low NOx emission comprises an ignition gun channel, a central air channel, a gas channel, an outer layer air channel and a nozzle, and is characterized in that: the ignition gun comprises an ignition gun channel, a central air channel, a gas channel and an outer air channel, wherein the ignition gun channel, the central air channel, the gas channel and the outer air channel are sequentially and coaxially arranged from the central axis of a combustor, a nozzle is connected with the outer annular surface of the outer air channel and extends towards the direction of a hearth, a plurality of central rotational flow blades are annularly arranged at the outlet of the central air channel, the gas channel is divided into an inner annular space and an outer annular space at the outlet, a front panel is arranged at the outlet of the inner annular space, a plurality of inclined gas spray holes are annularly arranged on the front panel, a plurality of gas rotational flow blades are annularly arranged in the outer annular space, and a plurality of.

2. The low NOx emissions converter gas burner of claim 1, wherein: the nozzle is a contraction type conical cylinder, and the contraction angle is 3-8 degrees.

3. The low NOx emissions converter gas burner of claim 1, wherein: the gas orifice sets up 1 ~ 2 layers along the hoop, the gas orifice is the round hole or other special-shaped holes.

4. The low NOx emissions converter gas burner of claim 1, wherein: the gas orifice is inwards inclined and forms an included angle of 5-10 degrees with the axis.

5. The low NOx emissions converter gas burner of claim 1, wherein: the rotational flow direction of the gas rotational flow blade is opposite to that of the outer rotational flow blade.