Nozzle for coal gasification suspension melting ironmaking

Abstract

The utility model 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 pulverized coal atomization 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 utility model belongs to metallurgy and coal chemical industry technical field, concretely relates to a nozzle for coal gasification suspension smelting iron. BACKGROUND

[0002] The steel industry is a pillar and basic industry of the national economy, and the crude steel output of China in 2023 is 10.19 million tons, and the total annual carbon dioxide emission is about 1.8 billion tons.With the proposal of the "double carbon" target and the promotion of green and low-carbon circular development, clean production, energy saving and emission reduction of the steel industry, and maximum reduction of pollutant emissions are the main goals of realizing transformation and upgrading.The non-blast furnace ironmaking technology avoids the dependence on coke, and the coal gasification suspension smelting iron reduces the raw material sintering process, which is the trend of future technological development.

[0003] The existing coal gasification nozzle is generally a gas-solid two-channel, which is a gasification agent channel and a coal powder channel.The coal gasification suspension smelting iron nozzle requires at least a gas-solid three-channel, and the existing coal gasification nozzle cannot meet the needs of coal gasification suspension smelting iron. UTILITY MODEL CONTENT

[0004] The utility model provides a nozzle for coal gasification suspension smelting iron in view of the above -mentioned problem.

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

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

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

[0008] Further, the upper end of the gasification agent pipe is provided with a gasification agent connecting flange, the lower end of the gasification agent pipe is welded with the inner pipe of the first cooling water nozzle, the outer pipe of the first cooling water nozzle is welded with the lower end of the first cooling water outer pipe, the upper end of the first cooling water outer pipe is sealed and connected with the gasification agent pipe through the fifth flange, the upper end of the coal powder outer pipe is sealed and connected with the first cooling water outer pipe through the fourth flange, the lower end of the coal powder outer pipe is welded with the coal powder nozzle, the upper end of the ore powder outer pipe is sealed and connected with the coal powder outer pipe through the third flange, the lower end of the ore powder outer pipe is welded with the inner pipe of the second cooling water nozzle, the outer pipe of the second cooling water nozzle is welded with the lower end of the second cooling water outer pipe, the upper end of the second cooling water outer pipe is sealed and connected with the ore powder outer pipe through the second flange, and the first flange is arranged on the upper portion of the second cooling water outer pipe and used for connecting the nozzle and the equipment.

[0009] Further, the first cooling water inlet and the first cooling water outlet are arranged on the upper portion of the first cooling water outer pipe, the first cooling water inlet and the first cooling water outlet are both above the fourth flange, the first cooling water inlet is communicated with the upper end of the first cooling water inlet pipe, the first cooling water inlet pipe is arranged in the first cooling water channel, and the lower end of the first cooling water inlet pipe is arranged in the first cooling water nozzle, the coal powder inlet is arranged on the upper portion of the coal powder outer pipe, the coal powder inlet is communicated with the upper end of the coal powder inlet pipe, the coal powder inlet pipe is arranged in the coal powder channel, the ore powder inlet is arranged on the upper portion of the ore powder outer pipe, the second cooling water inlet and the second cooling water outlet are arranged on the upper portion of the second cooling water outer pipe, the second cooling water inlet and the second cooling water outlet are both above the first flange, the second cooling water inlet is communicated with the upper end of the second cooling water inlet pipe, the second cooling water inlet pipe is arranged in the second cooling water channel, and the lower end of the second cooling water inlet pipe is arranged in the second cooling water nozzle.

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

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

[0012] Further, the cone angle β of the coal powder nozzle is 40°-65°.

[0013] Further, the outlet of the ore powder channel 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.

[0014] Further, the first cooling water nozzle, the coal powder nozzle and the second cooling water nozzle are integrally processed parts, and the material of the nozzle is high-temperature-resistant and wear-resistant stainless steel.

[0015] Further, the number of the coal powder inlets and the coal inlets is 1-4; the mineral powder inlets are tangentially communicated with the mineral powder channels, and the number of the mineral powder inlets is 1-4.

[0016] Further, 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 the h1 is 3-10 mm.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The utility model has three channels of gasification agent channel, coal powder channel and mineral powder channel, can improve the atomization effect of the gasification agent, the coal powder and the mineral powder, and further improve 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 realized in one step, the carbon conversion rate and the reduction rate of the mineral powder are improved, the energy consumption is reduced, and energy saving and emission reduction are realized.

[0019] 2. The material of the nozzle is high-temperature-resistant and wear-resistant stainless steel, and the double-layer cooling water jacket structure is combined, so that the service life of the nozzle can be effectively prolonged, and the overall process energy efficiency is improved.

[0020] 3. The flange connection mode is adopted between 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, the structure is simple, safe and stable, maintenance is convenient, and the utility model has a wide application market. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a structural schematic view of the utility model;

[0022] Fig. 2 It is a local enlarged view of the utility model;

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

[0024] To further illustrate the technical solution of this utility model, the following embodiments will be used to further explain this utility model.

[0025] like Figs. 1-2 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 sequentially from the inside to the outside.

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

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

[0028] The first cooling water inlet 3 and the first cooling water outlet 17 are arranged at the upper portion of the first cooling water outer pipe 16, and are both located above the fourth flange 19, the first cooling water inlet 3 is communicated with the upper end of the first cooling water inlet pipe 2, 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, the coal powder inlet 5 is arranged at the upper portion of the coal powder outer pipe 20, and is communicated with the upper end of the coal powder inlet pipe 6, the number of the coal powder inlet 5 and the coal powder inlet pipe 6 is 1-4, the coal powder inlet pipe 6 is located inside the coal powder channel 4, and is tangentially cut into the coal powder channel 4 from the upper portion, and the bottom end is located above the coal powder nozzle 28, the coal powder inlet pipe 6 rotates one circle in the coal powder channel 4, and then cuts into the coal powder nozzle 28, the tangential angle δ is 50-70°, the ore powder inlet 22 is arranged at the upper portion of the ore powder outer pipe 8, and is tangentially communicated with the ore powder channel 7, the number of the ore powder inlet 22 is 1-4, the second cooling water inlet 10 and the second cooling water outlet 24 are arranged at the upper portion of the second cooling water outer pipe 12, and are both located above the first flange 25, the second cooling water inlet 10 is communicated with 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, 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 the 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 integral machining parts, and the material of the nozzle is high-temperature-resistant and wear-resistant stainless steel.

[0030] The gas velocity of the gasification agent discharge nozzle is 60-80 m / s, the gas velocity of the coal powder and the ore powder discharge nozzle is 20-30 m / s, the gasification agent is oxygen and steam, the ore powder is iron-containing mineral, the coal powder is 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°. The h1 is 5 mm, the h2 is 4 mm, the number of the coal powder inlet 5 and the coal powder inlet pipe 6 is 4, the number of the ore powder inlet 22 is 4, the gas velocity of the gasification agent discharge nozzle is 60 m / s, the gas velocity of the coal powder and the ore powder discharge nozzle is 20 m / s, the coal powder is Jincheng anthracite, the volume content of the effective components CO+H2 in the synthesis gas is 64%, and the iron reduction rate is 93%.

[0033] Experiment 2

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

[0035] Experiment 3

[0036] The cone angle a is 50°, the cone angle b is 65°, the cone angle g is 45°, and the tangential angle d is 55°. h1 is 8mm, h2 is 3mm. The number of coal powder inlets 5 and coal pipes 6 is 2, the number of ore powder inlets 22 is 2, the gas velocity of the gasification agent discharge nozzle is 65m / s, the gas velocity of the coal powder and ore powder discharge nozzle is 22m / s. The coal powder is Shenmu bituminous coal, the effective component CO+H2 volume content in the synthesis gas is 65%, and the iron reduction rate is 94%.

[0037] Experiment 4

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

[0039] The main features and advantages of the present application are shown and described above, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0040] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A nozzle for coal gasification entrained melt ironmaking, characterized by: The gasification agent pipe (14), the first cooling water outer pipe (16), the coal powder outer pipe (20), the ore powder outer pipe (8) and the second cooling water outer pipe (12) are sequentially arranged from inside to outside. The inner cavity of the gasification agent pipe (14) is a gasification agent passage (1), the cavity between the gasification agent pipe (14) and the first cooling water outer pipe (16) is a first cooling water passage (18), the cavity between the first cooling water outer pipe (16) and the coal powder outer pipe (20) is a coal powder passage (4), the cavity between the coal powder outer pipe (20) and the ore powder outer pipe (8) is an ore powder passage (7), and the cavity between the ore powder outer pipe (8) and the second cooling water outer pipe (12) is a second cooling water passage (9).

2. A nozzle for coal gasification entrained melt iron making according to claim 1, characterized in that: The upper end of the gasification agent pipe (14) is provided with a gasification agent connecting flange (13), the lower end of the gasification agent pipe (14) is welded with the inner pipe of a first cooling water spray head (27), the outer pipe of the first cooling water spray head (27) is welded with the lower end of the first cooling water outer pipe (16), the upper end of the first cooling water outer pipe (16) is sealingly connected with the gasification agent pipe (14) through a fifth flange (15), the upper end of the coal powder outer pipe (20) is sealingly connected with the first cooling water outer pipe (16) through a fourth flange (19), the lower end of the coal powder outer pipe (20) is welded with a coal powder spray head (28), the upper end of the ore powder outer pipe (8) is sealingly connected with the coal powder outer pipe (20) through a third flange (21), the lower end of the ore powder outer pipe (8) is welded with the inner pipe of a second cooling water spray head (26), the outer pipe of the second cooling water spray head (26) is welded with the lower end of the second cooling water outer pipe (12), the upper end of the second cooling water outer pipe (12) is sealingly connected with the ore powder outer pipe (8) through a second flange (23), a first flange (25) is arranged on the upper portion of the second cooling water outer pipe (12) for connecting with a nozzle and equipment.

3. A nozzle for coal gasification entrained melt smelting iron according to claim 2, characterized in that: 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 communicated with the upper end of the first cooling water inlet pipe (2), 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); the coal powder inlet (5) is communicated with the upper end of the coal powder inlet pipe (6), the coal powder inlet pipe (6) is located inside the coal powder channel (4); the ore powder inlet (22) is located at the upper part of the ore powder outer pipe (8), the second cooling water inlet (10) and the second cooling water outlet (24) are located at 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 communicated with 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. A nozzle for coal gasification entrained melt smelting iron according to claim 3, characterized in that: The outlet inner cone angle α of the first cooling water nozzle (27) is 30°-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 1-5 mm.

5. A nozzle for coal gasification entrained melt smelting iron according to claim 3, characterized in that: The coal powder inlet pipe (6) enters the coal powder channel (4) from the upper part in a tangential direction, and the bottom end is located at the upper part of the coal powder nozzle (28); the coal powder inlet pipe (6) rotates one circle in the coal powder channel (4) and then discharges the coal powder into the coal powder nozzle (28) in a tangential direction, and the tangential angle δ is 50-70°.

6. A nozzle for coal gasification entrained melt smelting iron according to claim 3, characterized in that: The coal powder nozzle (28) has a cone angle β of 40°-65°.

7. A nozzle for coal gasification entrained melt smelting iron according to claim 6, characterized in that: The bottom outlet of the ore powder channel (7) has an outer cone angle structure, and the cone angle γ is 35°-60° and smaller than the cone angle β.

8. A nozzle for coal gasification entrained melt smelting iron 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 machined parts, and the material of the nozzles is high-temperature-resistant and wear-resistant stainless steel.

9. A nozzle for coal gasification suspension smelting of iron according to claim 3, characterized in that: The number of the coal powder inlet (5) and the coal powder inlet pipe (6) is 1-4; the ore powder inlet (22) is tangentially communicated with the ore powder channel (7), and the number of the ore powder inlet (22) is 1-4.

10. A nozzle for coal gasification entrained melt smelting iron 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 the h1 is 3-10 mm.

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