Nozzle for coal gasification suspension melting ironmaking

Abstract

The invention belongs to the technical field of metallurgy and coal chemical industry, and particularly relates to a nozzle for coal gasification suspension melting ironmaking, which comprises a gasifying agent pipe, a first cooling water outer pipe, a pulverized coal outer pipe, a mineral powder outer pipe and a second cooling water outer pipe which are sequentially arranged from inside to outside, an inner cavity of the gasifying agent pipe is a gasifying agent channel, a cavity between the gasifying agent pipe and the first cooling water outer pipe is a first cooling water channel, a cavity between the first cooling water outer pipe and the pulverized coal outer pipe is a pulverized coal channel, and a cavity between the pulverized coal outer pipe and the mineral powder outer pipe is a mineral powder channel. And a cavity between the mineral powder outer pipe and the second cooling water outer pipe is a second cooling water channel. The device is provided with the gasifying agent channel, the pulverized coal channel and the mineral powder channel, the atomization effect on a gasifying agent, pulverized coal and mineral powder can be improved, and then the gasification reaction rate of the pulverized coal and the reduction reaction rate of the mineral powder are increased.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy and coal chemical industry, and in particular relates to a nozzle used for coal gasification suspension melting and ironmaking. Background Art

[0002] Clean production, energy conservation and emission reduction in the steel industry, and minimizing pollutant emissions are the main goals of achieving transformation and upgrading. Non-blast furnace ironmaking technology avoids dependence on coke, and coal gasification suspension smelting ironmaking reduces the raw material sintering process, which is the trend of future technological development.

[0003] The existing coal gasification nozzles generally have two gas-solid channels, namely the gasifying agent channel and the coal powder channel. However, the coal gasification suspension melting ironmaking nozzle requires at least three gas-solid-solid channels. The existing coal gasification nozzles cannot meet the needs of coal gasification suspension melting ironmaking. Summary of the invention

[0004] In view of the above problems, the present invention provides a nozzle for coal gasification suspension melting ironmaking.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A nozzle for coal gasification suspension melting ironmaking, comprising a gasifying agent pipe, a first cooling water outer pipe, a coal powder outer pipe, a mineral powder outer pipe and a second cooling water outer pipe arranged in sequence from the inside to the outside;

[0007] The inner cavity of the gasifier tube is a gasifier channel, the cavity between the gasifier tube and the first cooling water outer tube is a first cooling water channel, the cavity between the first cooling water outer tube and the coal powder outer tube is a coal powder channel, the cavity between the coal powder outer tube and the mineral powder outer tube is a mineral powder channel, and the cavity between the mineral powder outer tube and the second cooling water outer tube is a second cooling water channel.

[0008] Furthermore, a gasifier connecting flange is provided at the upper end of the gasifier pipe, the lower end of the gasifier pipe is welded to the inner tube of the first cooling water nozzle, the outer tube of the first cooling water nozzle is welded to the lower end of the first cooling water outer tube, the upper end of the first cooling water outer tube is sealed and connected to the gasifier pipe through a fifth flange, the upper end of the coal powder outer tube is sealed and connected to the first cooling water outer tube through a fourth flange, a coal powder nozzle is welded to the lower end of the coal powder outer tube, the upper end of the mineral powder outer tube is sealed and connected to the coal powder outer tube through a third flange, the lower end of the mineral powder outer tube is welded to the inner tube of the second cooling water nozzle, the outer tube of the second cooling water nozzle is welded to the lower end of the second cooling water outer tube, the upper end of the second cooling water outer tube is sealed and connected to the mineral powder outer tube through a second flange, and a first flange is provided on the upper part of the second cooling water outer tube for connecting the nozzle and the equipment.

[0009] Furthermore, a first cooling water inlet and a first cooling water outlet are provided at the upper part of the first cooling water outer tube, and the first cooling water inlet and the first cooling water outlet are both located above the fourth flange, the first cooling water inlet is connected to the upper end of the first cooling water inlet pipe, the first cooling water inlet pipe is located inside the first cooling water channel, and the lower end of the first cooling water inlet pipe is located inside the first cooling water nozzle, a coal powder inlet is provided at the upper part of the coal powder outer tube, the coal powder inlet is connected to the upper end of the coal inlet pipe, and the coal inlet pipe is located in the coal powder channel, a mineral powder inlet is provided at the upper part of the mineral powder outer tube, and a second cooling water inlet and a second cooling water outlet are provided at the upper part of the second cooling water outer tube, the second cooling water inlet and the second cooling water outlet are both located above the first flange, the second cooling water inlet is connected to the upper end of the second cooling water inlet pipe, the second cooling water inlet pipe is located inside the second cooling water channel, and the lower end of the second cooling water inlet pipe is located inside the second cooling water nozzle.

[0010] Furthermore, the outlet inner cone angle α of the first cooling water nozzle is 30° to 50°, and the height difference h2 between the bottom of the first cooling water nozzle and the bottom of the coal powder nozzle is 1 to 5 mm.

[0011] Furthermore, the coal inlet pipe enters tangentially from the upper part of the coal powder channel, and the bottom end is located at the upper part of the coal powder nozzle. After the coal inlet pipe rotates one circle in the space of the coal powder channel, it discharges the coal powder into the coal powder nozzle tangentially, and the tangential angle δ is 50-70°.

[0012] Furthermore, the cone angle β of the pulverized coal nozzle ranges from 40° to 65°.

[0013] Furthermore, the bottom outlet of the mineral powder channel is an outer cone angle structure, the cone angle γ is 35° to 60°, and the cone angle γ is smaller than the cone angle β.

[0014] Furthermore, the first cooling water nozzle, the coal powder nozzle and the second cooling water nozzle are all integrally processed parts, and the nozzles are made of high temperature resistant and wear-resistant stainless steel.

[0015] Furthermore, the number of the coal powder inlet and the coal inlet pipe is 1 to 4; the mineral powder inlet is tangentially connected to the mineral powder channel, and the number of the mineral powder inlet is 1 to 4.

[0016] Furthermore, the distance between the lower end of the first cooling water inlet pipe and the bottom of the inner cavity of the first cooling water nozzle and the distance between the lower end of the second cooling water inlet pipe and the bottom of the inner cavity of the second cooling water nozzle are both h1, and h1 is 3-10 mm.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention has three channels, namely, a gasifying agent channel, a coal powder channel and a mineral powder channel, which can improve the atomization effect of the gasifying agent, coal powder and mineral powder, thereby improving the gasification reaction rate of the coal powder and the reduction reaction rate of the mineral powder; at the same time, the high-temperature gasification of the coal powder and the flash reduction of the mineral powder can be achieved in one step, thereby improving the carbon conversion rate and the reduction rate of the mineral powder, reducing energy consumption and achieving energy conservation and emission reduction;

[0019] 2. The nozzle of the present invention is made of high temperature and wear-resistant stainless steel, combined with a double-layer cooling water jacket structure, which can effectively extend the service life of the nozzle and improve the overall process energy efficiency;

[0020] 3. The gasification agent pipe, the first cooling water outer pipe, the coal powder outer pipe, the mineral powder outer pipe and the second cooling water outer pipe of the present invention are all connected by flange connection, which has a simple structure, is safe and stable, is easy to repair and maintain, and has a wide application market. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a partial enlarged view of the present invention;

[0023] Among them, there are a gasifying agent channel 1, a first cooling water inlet pipe 2, a first cooling water inlet 3, a pulverized coal channel 4, a pulverized coal inlet 5, a coal inlet pipe 6, a mineral powder channel 7, a mineral powder outer pipe 8, a second cooling water channel 9, a second cooling water inlet 10, a second cooling water inlet pipe 11, a second cooling water outer pipe 12, a gasifying agent connecting flange 13, a gasifying agent pipe 14, a fifth flange 15, a first cooling water outer pipe 16, a first cooling water outlet 17, a first cooling water channel 18, a fourth flange 19, a pulverized coal outer pipe 20, a third flange 21, a mineral powder inlet 22, a second flange 23, a second cooling water outlet 24, a first flange 25, a second cooling water nozzle 26, a first cooling water nozzle 27, and a pulverized coal nozzle 28. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0025] like Figure 1 to Figure 2 As shown, a nozzle for coal gasification suspension melting ironmaking includes a gasifying agent pipe 14, a first cooling water outer pipe 16, a coal powder outer pipe 20, a mineral powder outer pipe 8 and a second cooling water outer pipe 12 arranged in sequence from the inside to the outside;

[0026] The inner cavity of the gasifier tube 14 is the gasifier channel 1, the cavity between the gasifier tube 14 and the first cooling water outer tube 16 is the first cooling water channel 18, the cavity between the first cooling water outer tube 16 and the coal powder outer tube 20 is the coal powder channel 4, the cavity between the coal powder outer tube 20 and the mineral powder outer tube 8 is the mineral powder channel 7, the bottom outlet of the mineral powder channel 7 is an outer cone angle structure, the cone angle γ is 35°~60°, and the cone angle γ is smaller than the cone angle β, and the cavity between the mineral powder outer tube 8 and the second cooling water outer tube 12 is the second cooling water channel 9.

[0027] The upper end of the gasifier pipe 14 is provided with a gasifier connecting flange 13, the lower end of the gasifier pipe 14 is welded to the inner tube of the first cooling water nozzle 27, the outer tube of the first cooling water nozzle 27 is welded to the lower end of the first cooling water outer pipe 16, the outlet inner cone angle α of the first cooling water nozzle 27 is 30° to 50°, the height difference h2 between the bottom of the first cooling water nozzle 27 and the bottom of the coal powder nozzle 28 is 1 to 5 mm, the upper end of the first cooling water outer pipe 16 is sealed and connected to the gasifier pipe 14 through the fifth flange 15, and the upper end of the coal powder outer pipe 20 is connected to the first cooling water outer pipe 16 through the fourth flange 19. Tube 16 is sealed and connected, a coal powder nozzle 28 is welded at the lower end of the coal powder outer tube 20, and the cone angle β of the coal powder nozzle 28 ranges from 40° to 65°. The upper end of the mineral powder outer tube 8 is sealed and connected to the coal powder outer tube 20 through a third flange 21, and the lower end of the mineral powder outer tube 8 is welded to the inner tube of the second cooling water nozzle 26, and the outer tube of the second cooling water nozzle 26 is welded to the lower end of the second cooling water outer tube 12. The upper end of the second cooling water outer tube 12 is sealed and connected to the mineral powder outer tube 8 through a second flange 23, and a first flange 25 is provided on the upper part of the second cooling water outer tube 12 for connecting the nozzle and the equipment.

[0028] A first cooling water inlet 3 and a first cooling water outlet 17 are provided at the upper part of the first cooling water outer tube 16, and the first cooling water inlet 3 and the first cooling water outlet 17 are both located above the fourth flange 19, and the first cooling water inlet 3 is communicated with the upper end of the first cooling water inlet pipe 2, and the first cooling water inlet pipe 2 is located inside the first cooling water channel 18, and the lower end of the first cooling water inlet pipe 2 is located inside the first cooling water nozzle 27, and a coal powder inlet 5 is provided at the upper part of the coal powder outer tube 20, and the coal powder inlet 5 is communicated with the upper end of the coal inlet pipe 6, and the number of the coal powder inlet 5 and the coal inlet pipe 6 is 1 to 4, and the coal inlet pipe 6 is located in the coal powder channel 4, and the coal inlet pipe 6 enters tangentially from the upper part of the coal powder channel 4, and the bottom end is located at the upper part of the coal powder nozzle 28, and the coal inlet pipe 6 rotates in the space of the coal powder channel 4 for one circle and tangentially discharges the coal powder into the coal powder nozzle 28, and the tangential angle δ The angle of the second cooling water inlet 10 is 50-70°. A mineral powder inlet 22 is arranged on the upper part of the mineral powder outer tube 8. The mineral powder inlet 22 is tangentially connected to the mineral powder channel 7. The number of the mineral powder inlets 22 is 1-4. A second cooling water inlet 10 and a second cooling water outlet 24 are arranged on the upper part of the second cooling water outer tube 12. The second cooling water inlet 10 and the second cooling water outlet 24 are both located above the first flange 25. The second cooling water inlet 10 is connected to the upper end of the second cooling water inlet pipe 11. The second cooling water inlet pipe 11 is located inside the second cooling water channel 9. The lower end of the second cooling water inlet pipe 11 is located inside the second cooling water nozzle 26. The distance between the lower end of the first cooling water inlet pipe 2 and the bottom of the inner cavity of the first cooling water nozzle 27 and the distance between the lower end of the second cooling water inlet pipe 11 and the bottom of the inner cavity of the second cooling water nozzle 26 are both h1, and h1 is 3-10 mm.

[0029] The first cooling water nozzle 27, the coal powder nozzle 28 and the second cooling water nozzle 26 are all integrally processed parts, and the nozzles are made of high temperature resistant and wear-resistant stainless steel.

[0030] Among them, the gas velocity of the gasifier out of the nozzle is 60-80m / s, and the gas velocity of the coal powder and mineral powder out of the nozzle is 20-30m / s; the gasifier is oxygen and steam, the mineral powder is an iron-containing mineral; the coal powder is a carbon-containing energy; and the cooling water is deoxygenated and desalted water.

[0031] Experiment 1

[0032] The cone angle α is 45°, the cone angle β is 45°, the cone angle γ is 40°, and the tangential angle δ is 35°. h1 is 5mm, and h2 is 4mm. The number of coal powder inlets 5 and coal inlet pipes 6 is 4, the number of mineral powder inlets 22 is 4, the gas velocity of the gasifying agent discharge nozzle is 60m / s, and the gas velocity of the coal powder and mineral powder discharge nozzle is 20m / s. The coal powder is Jincheng anthracite, the volume content of the effective component CO+H2 in the synthesis gas is 64%, and the iron reduction rate is 93%.

[0033] Experiment 2

[0034] The cone angle α is 32°, the cone angle β is 60°, the cone angle γ is 55°, and the tangential angle δ is 65°. h1 is 8mm, and h2 is 5mm. The number of coal powder inlets 5 and coal inlet pipes 6 is 3, the number of mineral powder inlets 22 is 3, the gas velocity of the gasifying agent discharge nozzle is 75m / s, and the gas velocity of the coal powder and mineral powder discharge nozzle is 28m / s. The coal powder is Jincheng anthracite, the volume content of the effective component CO+H2 in the synthesis gas is 63%, and the iron reduction rate is 94%.

[0035] Experiment 3

[0036] The cone angle α is 50°, the cone angle β is 65°, the cone angle γ is 45°, and the tangential angle δ is 55°. h1 is 8 mm, and h2 is 3 mm. There are two coal powder inlets 5 and coal inlet pipes 6, two mineral powder inlets 22, the gas velocity of the gasifying agent discharge nozzle is 65 m / s, and the gas velocity of the coal powder and mineral powder discharge nozzle is 22 m / s. The coal powder is Shenmu bituminous coal, the volume content of the effective component CO+H2 in the synthesis gas is 65%, and the iron reduction rate is 94%.

[0037] Experiment 4

[0038] The cone angle α is 35°, the cone angle β is 50°, the cone angle γ is 45°, and the tangential angle δ is 60°. h1 is 5mm, and h2 is 5mm. The number of coal powder inlets 5 and coal inlet pipes 6 is 4, the number of mineral powder inlets 22 is 4, the gas velocity of the gasifying agent discharge nozzle is 70m / s, and the gas velocity of the coal powder and mineral powder discharge nozzle is 25m / s. The coal powder is Jincheng anthracite, the volume content of the effective component CO+H2 in the synthesis gas is 66%, and the iron reduction rate is 96%.

[0039] The above shows and describes the main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A nozzle for coal gasification suspension melting ironmaking, characterized in that: It comprises a gasifying agent pipe (14), a first cooling water outer pipe (16), a coal powder outer pipe (20), a mineral powder outer pipe (8) and a second cooling water outer pipe (12) which are arranged in sequence from the inside to the outside; The inner cavity of the gasifying agent tube (14) is the gasifying agent channel (1), the cavity between the gasifying agent tube (14) and the first cooling water outer tube (16) is the first cooling water channel (18), the cavity between the first cooling water outer tube (16) and the coal powder outer tube (20) is the coal powder channel (4), the cavity between the coal powder outer tube (20) and the mineral powder outer tube (8) is the mineral powder channel (7), and the cavity between the mineral powder outer tube (8) and the second cooling water outer tube (12) is the second cooling water channel (9).

2. The nozzle for coal gasification suspension melting ironmaking according to claim 1, characterized in that: The upper end of the gasifier pipe (14) is provided with a gasifier connecting flange (13), the lower end of the gasifier pipe (14) is welded to the inner pipe of the first cooling water nozzle (27), the outer pipe of the first cooling water nozzle (27) is welded to the lower end of the first cooling water outer pipe (16), the upper end of the first cooling water outer pipe (16) is sealed and connected to the gasifier pipe (14) via a fifth flange (15), the upper end of the pulverized coal outer pipe (20) is sealed and connected to the first cooling water outer pipe (16) via a fourth flange (19), and the lower end of the pulverized coal outer pipe (20) is welded to the inner pipe of the first cooling water nozzle (27). There is a coal powder nozzle (28), the upper end of the mineral powder outer tube (8) is sealed and connected to the coal powder outer tube (20) through a third flange (21), the lower end of the mineral powder outer tube (8) is welded to the inner tube of the second cooling water nozzle (26), the outer tube of the second cooling water nozzle (26) is welded to the lower end of the second cooling water outer tube (12), the upper end of the second cooling water outer tube (12) is sealed and connected to the mineral powder outer tube (8) through a second flange (23), and a first flange (25) is provided on the upper part of the second cooling water outer tube (12) for connecting the nozzle and the equipment.

3. The nozzle for coal gasification suspension melting ironmaking according to claim 2, characterized in that: A first cooling water inlet (3) and a first cooling water outlet (17) are provided at the upper part of the first cooling water outer tube (16), and the first cooling water inlet (3) and the first cooling water outlet (17) are both located above the fourth flange (19). The first cooling water inlet (3) is connected to the upper end of the first cooling water inlet pipe (2), and the first cooling water inlet pipe (2) is located inside the first cooling water channel (18), and the lower end of the first cooling water inlet pipe (2) is located inside the first cooling water nozzle (27). A coal powder inlet (5) is provided at the upper part of the coal powder outer tube (20), and the coal powder inlet (5) is connected to the upper end of the coal inlet pipe (6). The coal inlet pipe (6) is located in the coal powder channel (4), a mineral powder inlet (22) is arranged on the upper part of the mineral powder outer pipe (8), a second cooling water inlet (10) and a second cooling water outlet (24) are arranged on the upper part of the second cooling water outer pipe (12), the second cooling water inlet (10) and the second cooling water outlet (24) are both located above the first flange (25), the second cooling water inlet (10) is connected to the upper end of the second cooling water inlet pipe (11), the second cooling water inlet pipe (11) is located inside the second cooling water channel (9), and the lower end of the second cooling water inlet pipe (11) is located inside the second cooling water nozzle (26).

4. The nozzle for coal gasification suspension melting ironmaking according to claim 3, characterized in that: The outlet inner cone angle α of the first cooling water nozzle (27) is 30° to 50°, and the height difference h2 between the bottom of the first cooling water nozzle (27) and the bottom of the coal powder nozzle (28) is 1 to 5 mm.

5. The nozzle for coal gasification suspension melting ironmaking according to claim 3, characterized in that: The coal inlet pipe (6) enters tangentially from the upper part of the coal powder channel (4), and the bottom end is located at the upper part of the coal powder nozzle (28). After the coal inlet pipe (6) rotates one circle in the space inside the coal powder channel (4), it discharges the coal powder into the coal powder nozzle (28) tangentially, and the tangential angle δ is 50-70°.

6. The nozzle for coal gasification suspension melting ironmaking according to claim 3, characterized in that: The cone angle β of the coal powder nozzle (28) is in the range of 40° to 65°.

7. The nozzle for coal gasification suspension melting ironmaking according to claim 6, characterized in that: The bottom outlet of the mineral powder channel (7) is an external cone angle structure, the cone angle γ is 35° to 60°, and the cone angle γ is smaller than the cone angle β.

8. The nozzle for coal gasification suspension melting ironmaking according to claim 3, characterized in that: The first cooling water nozzle (27), the coal powder nozzle (28) and the second cooling water nozzle (26) are all integrally processed parts, and the nozzles are made of high temperature resistant and wear-resistant stainless steel.

9. The nozzle for coal gasification suspension melting ironmaking according to claim 3, characterized in that: The number of the coal powder inlet (5) and the coal inlet pipe (6) is 1 to 4; the mineral powder inlet (22) is tangentially connected to the mineral powder channel (7), and the number of the mineral powder inlet (22) is 1 to 4.

10. The nozzle for coal gasification suspension melting ironmaking according to claim 3, characterized in that: The distance between the lower end of the first cooling water inlet pipe (2) and the bottom of the inner cavity of the first cooling water nozzle (27) and the distance between the lower end of the second cooling water inlet pipe (11) and the bottom of the inner cavity of the second cooling water nozzle (26) are both h1, and h1 is 3 to 10 mm.

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