A columnar flow multi-vortex low-nitrogen burner

Abstract

The present invention relates to a columnar flow multi-vortex low-nitrogen burner, which can effectively solve the problems of uneven gas mixing, insufficient combustion, unstable air flow, low combustion intensity, spalling, fracture and displacement of the gas nozzle bricks in the prior art. The technical solution adopted is that the burner body is composed of an arc-shaped wall in the lower half of the vault and a straight wall connected below the vault. An air inlet pipe is arranged on the outer side wall of the arc-shaped wall in the lower half of the vault, and an air annular channel is arranged inside the arc-shaped wall. A gas inlet pipe is arranged on the outer side wall of the straight wall below the vault, and a gas annular channel is arranged inside the straight wall. Air distribution channels are arranged vertically and evenly along the circumferential direction on the inner side wall of the gas annular channel. The present invention can make the gas mixing uniform, the combustion sufficient, the air flow stable, and the combustion intensity high. The air and gas are arranged in a columnar flow and staggered in two annular channels, so that the air flow mixing effect is better, which is an innovation on the burner.

Description

Technical Field

[0001] The present invention relates to a burner, in particular to a columnar flow multi - swirl low - nitrogen burner. Background Art

[0002] A burner is an essential device for hot - blast stoves in industrial production. The fuel for combustion in the hot - blast stove is gas, and the combustion is controlled by the excess - air method. During the specified combustion time, the best combustion state is maintained. Therefore, the burner is one of the important components in the hot - blast stove. Whether the structure of the burner is reasonable directly affects the thermal efficiency and service life of the hot - blast stove. All along, problems such as uneven gas mixing, insufficient combustion, unstable air flow, low combustion intensity, spalling, fracture, and displacement of the gas nozzle bricks have always existed in existing burners. Although various improvements have been made to the combustion device at present, the effects are still not satisfactory. Therefore, the improvement of the burner is an urgent problem to be solved. Summary of the Invention

[0003] In view of the above situation, to solve the defects of the prior art, the purpose of the present invention is to provide a columnar flow multi - swirl low - nitrogen burner, which can effectively solve the problems of uneven gas mixing, insufficient combustion, unstable air flow, low combustion intensity, and spalling, fracture, and displacement of the gas nozzle bricks in the prior art.

[0004] The technical solution solved by the present invention is as follows: It includes a burner body, a vault, an air inlet pipe, and a gas inlet pipe. The burner body is composed of an arc - shaped wall in the lower half of the vault and a straight - section wall connected below the vault. An air inlet pipe is arranged on the outer side wall of the arc - shaped wall in the lower half of the vault, and an air annulus is arranged inside the arc - shaped wall. A gas inlet pipe is arranged on the outer side wall of the straight - section wall below the vault, and a gas annulus is arranged inside the straight - section wall. Air distribution channels are vertically and evenly distributed along the circumference inside the inner side wall of the gas annulus. The top of the air distribution channel is connected to the air annulus. One end of the side of the air distribution channel is provided with an air channel connected to the mixed - gas channel. A gas channel connected to the mixed - gas channel is arranged inside the inner side wall of the gas annulus. Four rows of upper and lower annular nozzles are arranged on the inner side wall of the straight - section wall.

[0005] The burner of the present invention can make the gas mix evenly, burn fully, have a stable air flow, high combustion intensity, and will not damage the burner nozzle during the mixed - combustion process. The air and gas are arranged in a columnar flow and staggered in two annuli, making the air - flow mixing effect better, with good use effect and strong practicability. It is an innovation in burners and has good economic and social benefits. Brief Description of the Drawings

[0006] Figure 1 It is the main structural sectional view of the present invention.

[0007] Figure 2 For the present invention Figure 1Schematic diagram of the A-A cross-section.

[0008] Figure 3 For the present invention Figure 1 Schematic diagram of the B-B cross-section.

[0009] Figure 4 For the present invention Figure 1 Schematic diagram of the C-C cross-section.

[0010] Figure 5 For the present invention Figure 1 Schematic diagram of the D-D cross-section. Specific embodiments

[0011] The following further elaborates on the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0012] As shown by Figures 1-5 , the present invention includes a burner body, a vault, an air inlet pipe, and a gas inlet pipe. The burner body 10 is composed of an arc-shaped wall of the lower half of the vault and a straight wall connected below the vault. An air inlet pipe 2 is provided on the outer side wall of the arc-shaped wall of the lower half of the vault, and an air annular channel 4 is provided inside the arc-shaped wall. A gas inlet pipe 3 is provided on the outer side wall of the straight wall below the vault, and a gas annular channel 5 is provided inside the straight wall. Air distribution channels 6 that are circumferentially perpendicular and evenly distributed are provided in the inner side wall of the gas annular channel 5. The top end of the air distribution channel 6 is connected to the air annular channel 4. One end of the side of the air distribution channel 6 is provided with an air channel 8 that is connected to a mixed gas channel 9. A gas channel 7 that is connected to the mixed gas channel 9 is provided in the inner side wall of the gas annular channel 5. Four rows of upper and lower annular nozzles 91, 92, 93, and 94 are provided on the inner side wall of the straight wall, forming a multi-angle swirling gas fully mixed combustion structure.

[0013] To ensure the use effect, the mixed gas channel 9 is circumferentially perpendicular and evenly distributed on the inner side wall of the straight wall of the burner body, and the air flow mixing effect is better.

[0014] The mixed gas channel 9 is connected to four rows of upper and lower annular nozzles 91, 92, 93, and 94 that are evenly arranged on the inner side wall of the straight wall of the burner body 10.

[0015] The upper and lower four rows of annular nozzles 91, 92, 93, and 94 are all connected to the gas channel 7, the air channel 8, and the mixed gas channel 9. The first row of nozzles 91 in the upper part is a straight injection hole perpendicular to the central axis of the burner. The second row of nozzles 92 is a hole with a tangential angle of 8-20° with the central axis. The third row of nozzles 93 is a hole with a tangential angle of 10-30° with the central axis. The fourth row of nozzles 94 is a hole with a tangential angle of 20-40° with the central axis, avoiding the uneven flow field formed by the swirling gas. The columnar nozzle flame runs and distributes directly downward to the vortex area after spraying. The multi-angle swirling gas makes the vortex area fully mixed and burned, improving the combustion efficiency. The air excess coefficient can be controlled between 1.02 and 1.05.

[0016] Further, the second row of nozzles 92 is a hole with a tangential angle of 5-15° with the central axis. The third row of nozzles 93 is a hole with a tangential angle of 15-25° with the central axis. The fourth row of nozzles 94 is a hole with a tangential angle of 25-30° with the central axis, further improving the combustion efficiency.

[0017] The usage situation of the present invention is that the air inlet pipe 2 is arranged on the side wall of the arc-shaped wall body under the arch top 1. There is an air ring channel 4 in the arc-shaped wall body under the arch top 1. The gas inlet pipe 3 is arranged on the side wall of the straight section wall body of the burner body. There is a gas ring channel 5 in the straight section wall body. A circumferentially evenly distributed vertical air distribution channel 6 is arranged inside the gas ring channel 5. The top end of the vertical air distribution channel 6 is connected to the air ring channel 4. One side end of the vertical air distribution channel 6 is provided with an air channel 8 connected to the mixed gas channel 9. There is a gas channel 7 connected to the mixed gas channel 9 inside the gas ring channel 5. There are four rows of upper and lower nozzles arranged in a ring on the inner side wall of the straight section wall body of the burner body. The gas channel 7, the air channel 8, and the mixed gas channel 9 are connected to the four rows of upper and lower nozzles. Among them, the first row of spray holes in the upper part is a straight injection hole perpendicular to the central axis of the burner. The second row is a hole with a tangential angle of 8-20° with the central axis. The third row is a hole with a tangential angle of 10-30° with the central axis. The fourth row is a hole with a tangential angle of 20-40° with the central axis, effectively solving the problems of uneven gas mixing, insufficient combustion, unstable air flow, low combustion intensity, and spalling, fracture, and displacement of the gas nozzle bricks in the prior art.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The burner adopts high-power flameless columnar multi-swirl combustion technology;

[0020] 2. The burner nozzle adopts a flameless mixing combustion structure, without detonation, and the burner nozzle will not be damaged during the mixing combustion process;

[0021] 3. The air and gas are arranged in a columnar and staggered manner in two ring channels, making the air flow mixing effect better;

[0022] 4. The burner nozzle adopts a four-row multi-swirl multi-angle distribution (the first row of nozzles sprays vertically and directly towards the axial center, the second row of nozzles is set at an angle of 8 - 20°, the third row of nozzles is set at an angle of 10 - 30°, and the fourth row of nozzles is set at an angle of 20 - 40°). Such a setting avoids the phenomenon of uneven flow field formed by the swirling gas. After the columnar nozzle flame is sprayed, it runs and distributes directly towards the eddy current area from top to bottom. The multi-angle swirling gas enables the eddy current area to be fully mixed and burned, improving the combustion efficiency. The air excess coefficient can be controlled between 1.02 and 1.05.

[0023] It should be noted that the above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above, and all fall within the protection scope of the present invention.

Claims

1. A column flow multi-swirl low nitrogen burner, comprising a burner body, a dome, an air inlet pipe and a gas inlet pipe, It is characterized in that The burner body (10) is composed of an arc-shaped wall body at the lower half of the arch and a straight wall body connected to the lower half of the arch. An air inlet pipe (2) is arranged on the outer wall of the arc-shaped wall body at the lower half of the arch, and an air ring channel (4) is arranged in the arc-shaped wall body. A gas inlet pipe (3) is arranged on the outer wall of the straight wall body at the lower half of the arch, and a gas ring channel (5) is arranged in the straight wall body. An air distribution channel (6) vertically and evenly distributed along the circumferential direction is arranged in the inner wall of the gas ring channel (5). The top of the air distribution channel (6) is connected to the air ring channel (4), and an air outlet (6) connected to the mixed gas channel (9) is arranged at one end of the side of the air distribution channel (6). A gas channel (8) is provided inside the inner wall of the gas ring channel (5) and is connected to the mixed gas channel (9); four upper and lower rows of annular nozzles (91), (92), (93), (94) are provided on the inner wall of the straight wall, forming a multi-angle swirl gas fully mixed combustion structure; the mixed gas channel (9) is arranged vertically and evenly distributed on the inner wall of the straight wall along the circumferential direction, so that the airflow mixing effect is better; the mixed gas channel (9) is connected to the four upper and lower rows of annular nozzles (91), (92), (93), (94) evenly arranged on the inner wall of the straight wall of the burner body (10).

2. The column flow multi-swirl low nitrogen burner according to claim 1, It is characterized in that The four upper and lower rows of annular nozzles (91), (92), (93), and (94) are all connected to the gas channel (7), the air channel (8), and the mixed gas channel (9). The upper first row of annular nozzles (91) are straight spray holes on the central axis of the burner, the second row of annular nozzles (92) are spray holes with a rotary cutting angle of 8-20° to the central axis, the third row of annular nozzles (93) are spray holes with a rotary cutting angle of 10-30° to the central axis, and the fourth row of annular nozzles (94) are spray holes with a rotary cutting angle of 20-40° to the central axis, so as to avoid uneven flow field formation by swirl gas. After the column flow nozzle flame is sprayed, it runs and distributes from top to bottom directly facing the vortex area. The multi-angle swirl gas makes the vortex area fully mixed and burned, thereby improving the combustion efficiency. The excess air coefficient is controlled between 1.02 and 1.

05.

3. The column flow multi-spin low nitrogen burner according to claim 2, It is characterized in that The second row of annular nozzles (92) are spray holes with a rotary cutting angle of 8-15° to the central axis, the third row of annular nozzles (93) are spray holes with a rotary cutting angle of 15-25° to the central axis, and the fourth row of annular nozzles (94) are spray holes with a rotary cutting angle of 25-30° to the central axis, further improving the combustion efficiency.

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