Controllable coal injection device for blast furnace ironmaking

Abstract

The utility model relates to the technical field of iron and steel smelting, and discloses a controllable coal injection device for blast furnace ironmaking, which comprises a crushing box and a mixed belly pipe, a first motor is fixedly arranged on the crushing box, the output end of the first motor is fixedly connected with a driving gear I, the driving gear I is fixedly connected with a first crushing roller, and the first crushing roller is fixedly connected with a second crushing roller. A first driven gear is connected to the first driving gear in a meshed mode, a second crushing roller is fixedly connected to the first driven gear, and a slope block is arranged in the crushing box. According to the coal injection device, large coal is refined into fine-particle coal powder step by step through the two procedures of crushing and grinding, the surface area of the coal powder is increased through the refined treatment, the coal powder can make contact with oxygen more easily, and therefore the combustion efficiency of the coal powder is remarkably improved, and in the combustion process, the combustion efficiency of the coal powder is greatly improved. And the smaller pulverized coal particles can be combusted more quickly, more heat energy is released, the reduction reaction in the blast furnace is promoted, and the ironmaking efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of iron and steel smelting, in particular to a coal injection device for controllable blast furnace ironmaking. Background Technique

[0002] In the process of blast furnace ironmaking, pulverized coal, as an important reducing agent and fuel, its combustion efficiency and utilization rate directly affect the production efficiency and product quality of the blast furnace.

[0003] Traditional pulverized coal supply methods often have problems such as uneven pulverized coal particles and incomplete combustion, resulting in large temperature fluctuations in the blast furnace and slow reduction reaction rates, thus affecting the ironmaking efficiency and hot metal quality. For this reason, a coal injection device for controllable blast furnace ironmaking is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies existing in the prior art, and a coal injection device for controllable blast furnace ironmaking is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: A coal injection device for controllable blast furnace ironmaking, including a crushing box and a mixing direct blowing pipe. A first motor is fixedly installed on the crushing box. The output end of the first motor is fixedly connected with a first driving gear. A first crushing roller is fixedly connected to the first driving gear. A first driven gear is meshed with the first driving gear. A second crushing roller is fixedly connected to the first driven gear. A slope block is arranged in the crushing box. A second motor is fixedly installed on the crushing box. The output end of the second motor is fixedly connected with a second driving gear. A first grinding roller is fixedly connected to the second driving gear. A second driven gear is meshed with the second driving gear. A second grinding roller is fixedly connected to the second driven gear. A collection box is arranged at the bottom of the crushing box.

[0006] As a further description of the above technical scheme:

[0007] A main pipe is fixedly connected to the collection box. A first ball valve is arranged at the connection between the main pipe and the collection box. One end of the main pipe far from the collection box is fixedly connected with a shunt pipe. A coal conveying pipe is fixedly connected to the shunt pipe. A spraying pipe is fixedly connected to the coal conveying pipe. A second ball valve is arranged at the connection between the spraying pipe and the coal conveying pipe.

[0008] As a further description of the above technical scheme:

[0009] One end of the spraying pipe far from the coal conveying pipe is fixedly connected with the mixing direct blowing pipe. A pneumatic pump is detachably installed at the connection between the mixing direct blowing pipe and the spraying pipe. One end of the mixing direct blowing pipe is fixedly connected with a hot air blower.

[0010] As a further description of the above technical scheme:

[0011] A controller is provided on the crushing box, and the controller is electrically connected to the first ball valve, the second ball valve, and the air pressure pump respectively.

[0012] As a further description of the above technical solution:

[0013] The first crushing roller and the second crushing roller are arranged symmetrically and staggeredly. There are two groups of slope blocks, which are symmetrically distributed in the crushing box, and the two groups of slope blocks are located above the first grinding roller and the second grinding roller.

[0014] As a further description of the above technical solution:

[0015] The included angle between the injection pipe and the mixing direct blowing pipe is 40°.

[0016] As a further description of the above technical solution:

[0017] There are multiple groups of the coal conveying pipe, the injection pipe, the second ball valve, and the air pressure pump. The multiple groups of injection pipes are located on one side of the mixing direct blowing pipe.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, the coal injection device refines large coal materials into tiny pulverized coal particles step by step through two processes of crushing and grinding. This refined treatment not only increases the surface area of the pulverized coal but also makes it easier to contact with oxygen, thus significantly improving the combustion efficiency of the pulverized coal. During the combustion process, smaller pulverized coal particles can burn more quickly, release more heat energy, promote the reduction reaction in the blast furnace, and improve the iron-making efficiency.

[0020] 2. In the utility model, the coal injection device is equipped with an advanced controller, which can realize the automatic control of the whole process of pulverized coal crushing, collection, transportation, and injection. Through a preset program or manual operation, the controller can accurately adjust the working states of each component, such as the opening degrees of the first ball valve and the second ball valve, the working pressure of the air pressure pump, etc., so as to achieve the accurate control of the pulverized coal flow rate and injection volume. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structure schematic diagram of a controllable coal injection device for blast furnace ironmaking proposed by the utility model;

[0022] Figure 2 It is a partial structure cross-sectional view of a controllable coal injection device for blast furnace ironmaking proposed by the utility model;

[0023] Figure 3 It is a partial structure explosion diagram of a controllable coal injection device for blast furnace ironmaking proposed by the utility model;

[0024] Figure 4 This is the top view of a coal injection device for controllable blast furnace ironmaking proposed by the present utility model.

[0025] Legend description:

[0026] 1. Crushing box; 2. First motor; 3. First driving gear; 4. First crushing roller; 5. First driven gear; 6. Second crushing roller; 7. Slope block; 8. Second motor; 9. Second driving gear; 10. First grinding roller; 11. Second driven gear; 12. Second grinding roller; 13. Collection box; 14. Main duct; 15. First ball valve; 16. Shunt pipe; 17. Coal conveying pipe; 18. Injection pipe; 19. Second ball valve; 20. Mixed direct blowing pipe; 21. Air pressure pump; 22. Hot air blower; 23. Controller. Specific implementation manners

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Referring to Figures 1-4 , an embodiment provided by the present utility model: A coal injection device for controllable blast furnace ironmaking includes a crushing box 1 and a mixed direct blowing pipe 20. A first motor 2 is fixedly installed on the crushing box 1. The output end of the first motor 2 is fixedly connected to a first driving gear 3. A first crushing roller 4 is fixedly connected to the first driving gear 3. A first driven gear 5 is meshed with the first driving gear 3. A second crushing roller 6 is fixedly connected to the first driven gear 5. A slope block 7 is arranged in the crushing box 1. A second motor 8 is fixedly installed on the crushing box 1. The output end of the second motor 8 is fixedly connected to a second driving gear 9. A first grinding roller 10 is fixedly connected to the second driving gear 9. A second driven gear 11 is meshed with the second driving gear 9. A second grinding roller 12 is fixedly connected to the second driven gear 11. A collection box 13 is arranged at the bottom of the crushing box 1. Through two processes of crushing and grinding, the large coal materials are gradually refined into fine coal powder particles by this coal injection device. This refined treatment not only increases the surface area of the coal powder, but also makes it easier to contact with oxygen, thus significantly improving the combustion efficiency of the coal powder. During the combustion process, the smaller coal powder particles can burn more quickly, release more heat energy, promote the reduction reaction in the blast furnace, and improve the ironmaking efficiency.

[0029] A main conduit 14 is fixedly connected to the collection box 13. A first ball valve 15 is provided at the connection between the main conduit 14 and the collection box 13. One end of the main conduit 14 away from the collection box 13 is fixedly connected to a shunt pipe 16. A coal conveying pipe 17 is fixedly connected to the shunt pipe 16. A spray pipe 18 is fixedly connected to the coal conveying pipe 17. A second ball valve 19 is provided at the connection between the spray pipe 18 and the coal conveying pipe 17. One end of the spray pipe 18 away from the coal conveying pipe 17 is fixedly connected to a mixed direct injection pipe 20. A pneumatic pump 21 is detachably installed at the connection between the mixed direct injection pipe 20 and the spray pipe 18. A hot air blower 22 is fixedly connected to one end of the mixed direct injection pipe 20. A controller 23 is provided on the crushing box 1. The controller 23 is electrically connected to the first ball valve 15, the second ball valve 19, and the pneumatic pump 21 respectively. The first crushing roller 4 and the second crushing roller 6 are arranged symmetrically and staggeredly. There are two groups of slope blocks 7, which are symmetrically distributed in the crushing box 1. The two groups of slope blocks 7 are located above the first grinding roller 10 and the second grinding roller 12. The included angle between the spray pipe 18 and the mixed direct injection pipe 20 is 40°. The coal conveying pipe 17, the spray pipe 18, the second ball valve 19, and the pneumatic pump 21 are all provided in multiple groups. The multiple groups of spray pipes 18 are located on one side of the mixed direct injection pipe 20. This coal spraying device is equipped with an advanced controller 23, which can realize the automatic control of the whole process of coal powder crushing, collection, transportation, and spraying. Through a preset program or manual operation, the controller 23 can precisely adjust the working states of each component, such as the opening degrees of the first ball valve 15 and the second ball valve, the working pressure of the pneumatic pump 21, etc., so as to realize the precise control of the coal powder flow rate and spraying amount.

[0030] Working principle: When using the controllable coal injection device for blast furnace ironmaking, first, coal lumps are fed into the crushing box 1 from the feed inlet. Then, the first motor 2 starts, driving the rotation of the first driving gear 3. The first driving gear 3 is fixedly connected to the first crushing roller 4, thus driving the rotation of the first crushing roller 4. At the same time, the driven gear 5 meshing with the first driving gear 3 also rotates accordingly, further driving the second crushing roller 6 to rotate in the opposite direction. The first crushing roller 4 and the second crushing roller 6 are arranged symmetrically and staggeredly. This design makes the gap between them gradually decrease, effectively crushing large coal materials into smaller particles. The crushed coal particles continue to fall in the crushing box 1 and, guided by the slope block 7, smoothly enter the grinding area. The design of the slope block 7 helps the uniform distribution and smooth flow of coal particles. In the grinding area, the second motor 8 starts, driving the rotation of the second driving gear 9. The second driving gear 9 is fixedly connected to the first grinding roller 10, thus driving the rotation of the first grinding roller 10. At the same time, the driven gear 11 meshing with the second driving gear 9 also drives the second grinding roller 12 to rotate. The first grinding roller 10 and the second grinding roller 12 work together to further grind the coal particles and refine the pulverized coal particles. This process significantly improves the combustion efficiency and utilization rate of the pulverized coal. The ground pulverized coal falls into the collection box 13 through the outlet at the bottom of the crushing box 1. The collection box 13 serves as a temporary storage container for the pulverized coal, ensuring the stability and concentration of the pulverized coal before transportation. A main pipe 14 is provided on the collection box 13, and a first ball valve 15 is installed at the connection between the main pipe 14 and the collection box 13. By controlling the opening and closing of the first ball valve 15, the flow rate of the pulverized coal entering the main pipe 14 can be precisely adjusted to achieve the on-demand transportation of the pulverized coal. The main pipe 14 transports the pulverized coal to the shunt pipe 16, and the shunt pipe 16 then evenly distributes the pulverized coal into multiple groups of coal conveying pipes 17. This design ensures that the pulverized coal can be supplied to multiple injection points simultaneously and evenly. Each group of coal conveying pipes 17 is provided with an injection pipe 18, and a second ball valve 19 is installed at the connection between the injection pipe 18 and the coal conveying pipe 17. By adjusting the opening of the second ball valve 19, the injection amount of the pulverized coal can be precisely controlled to achieve the on-demand injection and precise control of the pulverized coal. The end of the injection pipe 18 away from the coal conveying pipe 17 is fixedly connected to the mixing direct injection pipe 20, and the included angle between them is 40°. This design helps the pulverized coal to better mix with the hot air in the mixing direct injection pipe 20, forming a uniform pulverized coal air flow and improving the combustion efficiency and distribution uniformity of the pulverized coal. An air pressure pump 21 is installed at the connection between the injection pipe 18 and the mixing direct injection pipe 20, and its working state is controlled by a controller 23. The air pressure pump 21 provides the necessary pressure for the pulverized coal injection to ensure that the pulverized coal can be smoothly and stably injected into the blast furnace. One end of the mixing direct injection pipe 20 is fixedly connected to a hot air blower 22, and the hot air blower 22 provides high-temperature hot air for the pulverized coal air flow. The high-temperature hot air not only increases the combustion speed and temperature of the pulverized coal but also promotes the reduction reaction in the blast furnace, improving the ironmaking efficiency. A controller 23 is provided on the crushing box 1, and this controller 23 is electrically connected to components such as the first ball valve 15, the second ball valve 19, and the air pressure pump 21.Through a preset program or manual operation, the controller 23 can achieve automatic control over the entire process of pulverized coal crushing, collection, transportation, and injection. This automatic control not only improves work efficiency but also reduces the errors and labor intensity of manual operations, ensuring the stability and reliability of the entire process.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pulverized coal injection device for controllable blast furnace ironmaking, comprising a crushing box (1) and a mixing and direct blowing pipe (20), characterized in that: A first motor (2) is fixedly installed on the crushing box (1). The output end of the first motor (2) is fixedly connected to a first driving gear (3). A first crushing roller (4) is fixedly connected to the first driving gear (3). A first driven gear (5) is meshed with the first driving gear (3). A second crushing roller (6) is fixedly connected to the first driven gear (5). A slope block (7) is arranged in the crushing box (1). A second motor (8) is fixedly installed on the crushing box (1). The output end of the second motor (8) is fixedly connected to a second driving gear (9). A first grinding roller (10) is fixedly connected to the second driving gear (9). A second driven gear (11) is meshed with the second driving gear (9). A second grinding roller (12) is fixedly connected to the second driven gear (11). A collecting box (13) is arranged at the bottom of the crushing box (1).

2. The coal injection device for controllable blast furnace ironmaking according to claim 1, wherein: A main pipe (14) is fixedly connected to the collecting box (13). A first ball valve (15) is arranged at the connection between the main pipe (14) and the collecting box (13). The end of the main pipe (14) far away from the collecting box (13) is fixedly connected to a shunt pipe (16). A coal conveying pipe (17) is fixedly connected to the shunt pipe (16). A spraying pipe (18) is fixedly connected to the coal conveying pipe (17). A second ball valve (19) is arranged at the connection between the spraying pipe (18) and the coal conveying pipe (17).

3. The coal injection device for blast furnace ironmaking according to claim 2, characterized in that: The end of the spraying pipe (18) far away from the coal conveying pipe (17) is fixedly connected to a mixed direct blowing pipe (20). An air pressure pump (21) is detachably installed at the connection between the mixed direct blowing pipe (20) and the spraying pipe (18). A hot air blower (22) is fixedly connected to one end of the mixed direct blowing pipe (20).

4. A coal injection device for controllable blast furnace ironmaking according to claim 3, characterized in that: A controller (23) is arranged on the crushing box (1). The controller (23) is electrically connected to the first ball valve (15), the second ball valve (19), and the air pressure pump (21) respectively.

5. The coal injection device for blast furnace ironmaking according to claim 4, wherein: The first crushing roller (4) and the second crushing roller (6) are arranged symmetrically and staggeredly. There are two groups of slope blocks (7) which are symmetrically distributed in the crushing box (1). The two groups of slope blocks (7) are located above the first grinding roller (10) and the second grinding roller (12).

6. A coal injection device for controllable blast furnace ironmaking according to claim 5, characterized in that: The included angle between the spraying pipe (18) and the mixed direct blowing pipe (20) is 40°.

7. The coal injection device for controllable blast furnace ironmaking according to claim 6, characterized in that: The coal conveying pipe (17), the spraying pipe (18), the second ball valve (19), and the air pressure pump (21) are all provided with multiple groups. The multiple groups of spraying pipes (18) are located on one side of the mixed direct blowing pipe (20).

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