Low-nitrogen combustion device of magnesium metal reduction furnace

Abstract

The utility model relates to the technical field of magnesium metal reduction furnaces, in particular to a magnesium metal reduction furnace low-nitrogen combustion device which comprises a hearth, a pipeline used for providing combustion pulverized coal is arranged on the hearth, the output end of the pipeline is fixedly connected with a nozzle, and a first discharge hole and a second discharge hole are formed in the nozzle. The first discharge holes and the second discharge holes are formed in the nozzle in the circumferential direction at equal intervals. By means of the arrangement of the first flow guide plate and the second flow guide plate, pulverized coal is discharged in a vortex mode when discharged, the uniformity of the pulverized coal scattered in a hearth is improved, the pulverized coal is blocked through the first flow guide cover and the second flow guide cover, the speed of the pulverized coal discharged from the second flow guide hole is reduced, and therefore the pulverized coal is more uniform. The final falling point of the pulverized coal discharged from the second flow guide hole is the end, close to the nozzle, of the hearth, the final falling point of the pulverized coal discharged from the first flow guide hole is the end, away from the nozzle, of the hearth, and the uniformity of the pulverized coal sprayed into the hearth can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal magnesium reduction furnaces, in particular to a low-nitrogen combustion device for a metal magnesium reduction furnace. Background Art

[0002] The magnesium metal reduction furnace is the core equipment for magnesium production. There are many types of magnesium metal reduction furnaces used in China. According to the different fuels used, they can be roughly divided into two categories: reduction furnaces heated by gas or heavy oil and reduction furnaces using coal as fuel.

[0003] Existing low-nitrogen combustion devices of magnesium reduction furnaces are all provided with nozzles for spraying pulverized coal. However, the existing nozzles only spray the pulverized coal into the furnace in a straight line, and the pulverized coal falls under the pull of gravity, so that the pulverized coal cannot be evenly scattered in the furnace, which has a negative impact on the combustion efficiency of the low-nitrogen combustion device of the magnesium reduction furnace. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that coal powder cannot be evenly scattered in the furnace, and proposes a low-nitrogen combustion device for a metal magnesium reduction furnace.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A low-nitrogen combustion device for a magnesium reduction furnace comprises a furnace, and a pipe for providing pulverized coal for combustion is arranged on the furnace, a nozzle is fixedly connected to the output end of the pipe, a first discharge hole and a second discharge hole are opened on the nozzle, and the first discharge hole and the second discharge hole are equidistantly opened on the nozzle in the circumferential direction.

[0007] Preferably, two circles of the first discharge holes and the second discharge holes form a group, and the first discharge holes are arranged at the outer circle position of the second discharge holes.

[0008] Preferably, the first discharge hole comprises a first guide hole and a first guide plate, and the first guide plate is equidistantly arranged on the inner wall of the first guide hole in the circumferential direction.

[0009] Preferably, the first guide hole is a through hole, and the first guide plate is a rectangular structure.

[0010] Preferably, the second discharge hole includes a first air guide cover, a second air guide cover, a second air guide plate and a second air guide hole, a guide port is arranged between the first air guide cover and the second air guide cover, and the second air guide plate is circumferentially equidistantly arranged at one end of the second discharge hole away from the second air guide cover.

[0011] Preferably, the first air guide cover and the second air guide cover are bucket-shaped structures, and the first air guide cover is arranged at an end of the second discharge hole away from the second air guide plate, and the second air guide cover is arranged at the inner end position of the first air guide cover.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The utility model arranges the first guide plate and the second guide plate so that the coal powder is discharged in the form of a vortex when discharged. Compared with the linear discharge of coal powder in the prior art, the coal powder in the technical solution is more dispersed in the furnace, which helps to improve the uniformity of the coal powder when scattered in the furnace.

[0014] 2. The utility model blocks the coal powder by the first guide cover and the second guide cover, which helps to reduce the speed of the coal powder discharged from the second guide hole, so that the final landing point of the coal powder discharged from the second guide hole is the end of the furnace close to the nozzle, and the final landing point of the coal powder discharged from the first guide hole is the end of the furnace far from the nozzle, which helps to improve the uniformity of the coal powder sprayed in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of the low nitrogen combustion device for a magnesium reduction furnace proposed in the utility model;

[0016] Figure 2 This is a schematic diagram of the pipe and nozzle connection structure of the low-nitrogen combustion device of the magnesium reduction furnace proposed by the utility model;

[0017] Figure 3 A top view of the first discharge hole of the low nitrogen combustion device for a magnesium reduction furnace proposed by the utility model;

[0018] Figure 4 For this utility model Figure 3 A cross-sectional view of

[0019] Figure 5 This is a schematic diagram of the second discharge hole structure of the low nitrogen combustion device of the magnesium reduction furnace proposed by the utility model;

[0020] Figure 6 For this utility model Figure 5 Sectional view in .

[0021] In the figure: 1, furnace; 2, pipeline; 3, nozzle; 4, first discharge hole; 41, first guide hole; 42, first guide plate; 5, second discharge hole; 51, first guide cover; 52, second guide cover; 53, second guide plate; 54, second guide hole. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-Figure 6 A low-nitrogen combustion device for a magnesium reduction furnace comprises a furnace 1, and a pipe 2 for providing pulverized coal for combustion is arranged on the furnace 1, a nozzle 3 is fixedly connected to the output end of the pipe 2, a first discharge hole 4 and a second discharge hole 5 are arranged on the nozzle 3, and the first discharge hole 4 and the second discharge hole 5 are equidistantly arranged on the nozzle 3 in the circumferential direction, two circles of the first discharge hole 4 and the second discharge hole 5 form a group, and the first discharge hole 4 is arranged at the outer circle position of the second discharge hole 5;

[0024] A further implementation method is as follows: the first discharge hole 4 includes a first guide hole 41 and a first guide plate 42. The first guide hole 41 is a through hole. The setting of the through hole can prevent the coal powder from being blocked when flowing in the first guide hole 41. The first guide plate 42 is equidistantly arranged on the inner wall of the first guide hole 41 in the circumferential direction. The first guide plate 42 is a rectangular structure. The setting of the first guide plate 42 allows the coal powder to be diverted under the guidance of the first guide plate 42, so that the coal powder is discharged in a vortex manner when spraying out of the first guide hole 41, which helps to ensure the uniformity of the coal powder in the furnace 1.

[0025] A further embodiment is as follows: the second discharge hole 5 comprises a first air guide cover 51, a second air guide cover 52, a second air guide plate 53 and a second air guide hole 54, the first air guide cover 51 and the second air guide cover 52 are bucket-shaped structures, a guide port is arranged between the first air guide cover 51 and the second air guide cover 52, the second air guide plate 53 is arranged equidistantly in the circumferential direction at one end of the second discharge hole 5 away from the second air guide cover 52, and the first air guide cover 51 is arranged at one end of the second discharge hole 5 away from the second air guide plate 53, the second air guide cover 52 is arranged at the inner end position of the first air guide cover 51, and the second air guide cover 52 is arranged at the inner end position of the first air guide cover 51, through the first The guide cover 51 and the second guide cover 52 can guide the pulverized coal, so that the pulverized coal enters the first guide cover 51 from the pipeline 2, and the pulverized coal enters the guide port under the guidance of the first guide cover 51, so that the pulverized coal enters the small space from the large space, thereby reducing the flow speed of the pulverized coal, and the pulverized coal enters the second guide cover 52 through the guide port, diffuses outward under the guidance of the second guide cover 52, and is guided and diverted by the second guide plate 53, so that the pulverized coal is discharged in a vortex manner when it is sprayed out of the second guide hole 54, which helps to ensure the uniformity of the pulverized coal in the furnace 1;

[0026] Because the movement speeds of the coal powder in the second guide hole 54 and the first guide hole 41 are different, the final landing points of the coal powder discharged from the first guide hole 41 and the second guide hole 54 are different, so that the coal powder falls at different positions in the furnace 1, which helps to improve the uniformity of the coal powder.

[0027] The functional principle of the utility model can be explained through the following operation modes:

[0028] The pulverized coal for combustion enters the nozzle 3 through the pipeline 2, and is discharged through the first discharge hole 4 and the second discharge hole 5;

[0029] When a portion of the coal powder is discharged through the first guide hole 41, the coal powder is diverted by the first guide plate 42 so that the coal powder is discharged in a vortex shape.

[0030] When another part of the coal powder is discharged through the second guide hole 54, the coal powder first converges to the center of the second guide hole 54 under the guidance of the first guide cover 51, and then enters the second guide cover 52 through the guide port. The coal powder diffuses outward under the guidance of the second guide cover 52, and finally the coal powder is divided by the second guide plate 53, so that the coal powder is discharged in a vortex shape.

[0031] Through the first air guide cover 51 and the second air guide cover 52, the speed of the coal powder discharged from the second air guide hole 54 is slower than that of the coal powder discharged from the first air guide hole 41, so that the final landing point of the coal powder discharged from the first air guide hole 41 is farther than the final landing point of the coal powder discharged from the second air guide hole 54, so that the coal powder can be sprayed on every place in the furnace 1.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-nitrogen combustion device for a magnesium reduction furnace, comprising a furnace (1), wherein the furnace (1) is provided with a pipeline (2) for providing pulverized coal for combustion, wherein: The output end of the pipeline (2) is fixedly connected to a nozzle (3), and the nozzle (3) is provided with a first discharge hole (4) and a second discharge hole (5), and the first discharge hole (4) and the second discharge hole (5) are both equidistantly arranged on the nozzle (3) in the circumferential direction.

2. The low nitrogen combustion device for a magnesium reduction furnace according to claim 1, characterized in that: The first discharge holes (4) and the second discharge holes (5) form a group of two circles, and the first discharge holes (4) are arranged at the outer circle position of the second discharge holes (5).

3. The low nitrogen combustion device for a magnesium reduction furnace according to claim 1, characterized in that: The first discharge hole (4) comprises a first guide hole (41) and a first guide plate (42); the first guide plate (42) is equidistantly arranged on the inner wall of the first guide hole (41) in the circumferential direction.

4. The low nitrogen combustion device for a magnesium reduction furnace according to claim 3, characterized in that: The first flow guide hole (41) is a through hole, and the first flow guide plate (42) is a rectangular structure.

5. The low nitrogen combustion device for a magnesium reduction furnace according to claim 1, characterized in that: The second discharge hole (5) comprises a first flow guide cover (51), a second flow guide cover (52), a second flow guide plate (53) and a second flow guide hole (54); a flow guide port is provided between the first flow guide cover (51) and the second flow guide cover (52); and the second flow guide plate (53) is equidistantly provided at one end of the second discharge hole (5) away from the second flow guide cover (52) in the circumferential direction.

6. The low nitrogen combustion device for a magnesium reduction furnace according to claim 5, characterized in that: The first air guide cover (51) and the second air guide cover (52) are bucket-shaped structures, and the first air guide cover (51) is arranged at an end of the second discharge hole (5) away from the second air guide plate (53), and the second air guide cover (52) is arranged at the inner end position of the first air guide cover (51).

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