Blast furnace pulverized coal fluidization preheating structure

Abstract

The utility model relates to the technical field of pulverized coal conveying, and discloses a blast furnace pulverized coal fluidization preheating structure. The blast furnace pulverized coal fluidization preheating structure comprises a heating pipe, an electric heating plate is fixedly installed in the heating pipe, a limiting pipe is fixedly installed at the front end of the heating pipe, a fixed pipe is fixedly installed in the limiting pipe, a brushless motor is fixedly installed in the fixed pipe, and a motor is fixedly installed in the brushless motor. Fan blades are installed on the outer side of a rotating shaft of the brushless motor in a penetrating mode, a flow guide cover is installed at the rear end of the heating pipe in a penetrating mode, when the brushless motor drives the fan blades to rotate, the fan blades can generate airflow blowing to the electric heating plate, the temperature of the airflow is increased through the electric heating plate, and pulverized coal can absorb heat of the airflow in the process that the airflow drives pulverized coal to move backwards; by means of the mode, the coal powder can be preheated in the fluidization process, and the coal powder can enter the blast furnace in a dry state.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverized coal conveying, in particular to a pulverized coal fluidization preheating structure for blast furnaces. Background Technique

[0002] Since blast-furnace pulverized coal products have been industrially and widely promoted and applied for half a century, the status of blast-furnace pulverized coal in the iron and steel smelting process has been increasing day by day. Pulverized coal injection replaces part of the coke. On the one hand, it can save coking investment, build fewer coke ovens, and reduce air pollution caused by coking. On the other hand, it can greatly relieve the tight supply and demand situation of coking coal. The coal ratio of blast-furnace pulverized coal shows an increasing trend year by year and has gradually become an indispensable burden in iron and steel enterprises.

[0003] The existing Chinese utility model patent with the reference publication number: CN202688338U discloses a pulverized coal fluidization device for blast-furnace coal injection. The utility model includes a fluidized bed sleeve, a large flange, a small flange, and a feeding pipeline inserted into the central holes of the large flange and the small flange. The fluidized bed sleeve is fixedly arranged at the front end of the large flange. A filter screen is arranged at the other end of the fluidized bed sleeve. A flow guiding baffle is arranged inside the fluidized bed sleeve. The flow guiding baffle is fixedly arranged on the large flange through 4 fixing rods. The utility model uses the fluidized bed sleeve as a buffer area, and then fills the pulverized coal into the lifting pipeline through a blowing tank, improving the continuity and uniformity of the blown pulverized coal. A flow guiding baffle is added at the inlet and is fixed to the flange by 4 fixing rods, avoiding the direct blowing of gas and affecting the fluidization effect.

[0004] During the use of the existing pulverized coal fluidization structure, since the volume of pulverized coal entering the pipeline cannot be controlled, the air flow cannot drive all the pulverized coal to move, resulting in the accumulation of pulverized coal at the feeding place and finally blocking the pipeline. Since the pulverized coal is easy to absorb water and agglomerate, it will affect the furnace temperature and combustion efficiency after entering the blast furnace. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a pulverized coal fluidization preheating structure for blast furnaces, which has the advantages of reducing the water content of pulverized coal and avoiding the blockage of pulverized coal, and solves the above technical problems.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present utility model provides the following technical solutions: A blast furnace pulverized coal fluidized preheating structure, comprising: a heating pipe, an electric heating plate is fixedly installed inside the heating pipe, a limiting pipe is fixedly installed at the front end of the heating pipe, a fixed pipe is fixedly installed inside the limiting pipe, a brushless motor is fixedly installed inside the fixed pipe, a fan blade is inserted and installed outside the rotating shaft of the brushless motor, a flow guiding cover is inserted and installed at the rear end of the heating pipe, an end plate is fixedly installed at the rear end of the heating pipe, a connecting pipe is fixedly installed at the rear side of the end plate, a receiving pipe is fixedly installed at the rear end of the connecting pipe, a feeding pipe is fixedly installed above the receiving pipe, a support frame is fixedly installed above the feeding pipe, a driving motor is fixedly installed above the support frame, a limiting frame is fixedly installed below the feeding pipe, a driving shaft is inserted through the center of the limiting frame, and a screw conveyor is fixedly installed outside the driving shaft; the electric heating plate can heat air.

[0009] As a preferred technical solution of the present utility model, the front end of the fixed pipe is of a conical structure, and a protrusion connected to the limiting pipe is provided on the outer side of the fixed pipe; the fixed pipe can limit the position of the brushless motor.

[0010] As a preferred technical solution of the present utility model, the brushless motors are symmetrically installed front and back on both sides of the fixed pipe, and the fan blades are fixedly installed outside the rotating shafts of the brushless motors on both sides of the fixed pipe front and back; the brushless motors can drive the fan blades to rotate.

[0011] As a preferred technical solution of the present utility model, the air outlet direction of the fan blade is from front to back, the aperture size of the rear end of the flow guiding cover is the same as that of the connecting pipe, and the front side of the flow guiding cover is of a conical structure; the fan blade can generate an air flow blowing towards the electric heating plate when rotating.

[0012] As a preferred technical solution of the present utility model, the front end of the receiving pipe is communicated with the connecting pipe, and the upper end of the receiving pipe is communicated with the feeding pipe; the receiving pipe can limit the positions of the pulverized coal and the air flow.

[0013] As a preferred technical solution of the present utility model, the driving motor is fixed above the axis of the feeding pipe through the limiting frame, and a rotational connection is formed between the driving shaft and the limiting frame; the limiting frame can limit the position of the lower end of the driving shaft.

[0014] As a preferred technical solution of the present utility model, the upper part of the driving shaft is fixedly connected to the rotating shaft of the driving motor in an inserted manner, and the screw conveyor extends downward from the middle of the feeding pipe to the bottom end of the feeding pipe; the driving shaft can drive the screw conveyor to rotate.

[0015] Compared with the prior art, the present utility model provides a blast furnace pulverized coal fluidized preheating structure, which has the following beneficial effects:

[0016] 1. In the present utility model, through the arrangement of the heating pipe, an electric heating plate is fixedly installed inside the heating pipe, and a limiting pipe is fixedly installed at the front end of the heating pipe. The brushless motor is fixed at both the front and rear ends of the fixed pipe through the fixing pipe. When the brushless motor drives the fan blade to rotate, the fan blade will generate an air flow blowing towards the electric heating plate. The temperature of the air flow rises through the electric heating plate. During the process of the air flow driving the pulverized coal to move backward, the pulverized coal will absorb the heat of the air flow, thereby enabling the moisture contained in the pulverized coal to evaporate rapidly, achieving the preheating effect. This method can preheat the pulverized coal during the fluidization process and enable the pulverized coal to enter the blast furnace in a dry state.

[0017] 2. In the present utility model, through the arrangement of the auger, the auger is fixedly installed on the outer side of the drive shaft. The upper end of the drive shaft is fixedly connected to the rotating shaft of the drive motor, and the lower end position is restricted by the limiting frame. The drive motor drives the drive shaft to rotate to make the auger drive the pulverized coal to move downward. At the same time, the outer edge of the auger contacts the inner wall of the cylindrical structure at the bottom end of the feeding pipe. The pulverized coal needs to pass through the rotation of the auger to be discharged from the bottom end of the feeding pipe. By adjusting the power of the drive motor to limit the rotation of the auger, the speed of the pulverized coal entering the inside of the receiving pipe is restricted, thereby avoiding the situation of pulverized coal blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 is a schematic diagram of the installation structure of the brushless motor of the present utility model;

[0020] Figure 3 is a schematic diagram of the cross-sectional structure of the heating pipe of the present utility model;

[0021] Figure 4 is a schematic diagram of the cross-sectional structure of the receiving pipe of the present utility model;

[0022] Among them: 1. Heating pipe; 11. Electric heating plate; 12. Limiting pipe; 13. Fixing pipe; 14. Brushless motor; 15. Fan blade; 16. Flow guide cover; 17. End plate; 18. Connecting pipe; 2. Receiving pipe; 21. Feeding pipe; 22. Support frame; 23. Drive motor; 24. Limiting frame; 25. Drive shaft; 26. Auger. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0024] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Please refer to Figure 1 - Figure 4 , in this embodiment, a blast furnace pulverized coal fluidized preheating structure includes: a heating pipe 1, an electric heating plate 11 is fixedly installed inside the heating pipe 1, a limiting pipe 12 is fixedly installed at the front end of the heating pipe 1, a fixed pipe 13 is fixedly installed inside the limiting pipe 12, a brushless motor 14 is fixedly installed inside the fixed pipe 13, a fan blade 15 is inserted and installed outside the rotating shaft of the brushless motor 14, a flow guide cover 16 is inserted and installed at the rear end of the heating pipe 1, an end plate 17 is fixedly installed at the rear end of the heating pipe 1, and a connecting pipe 18 is fixedly installed at the rear side of the end plate 17.

[0027] The front end of the fixed pipe 13 is of a conical structure, and a protrusion connected to the limiting pipe 12 is provided on the outer side of the fixed pipe 13. The brushless motors 14 are symmetrically installed in the front and back of the fixed pipe 13 in a front-back mirror image manner. The fan blades 15 are fixedly installed outside the rotating shafts of the brushless motors 14 on both the front and back sides of the fixed pipe 13. The air outlet direction of the fan blades 15 is from front to back. The aperture size of the rear end of the flow guide cover 16 is the same as that of the connecting pipe 18, and the front side of the flow guide cover 16 is of a conical structure.

[0028] Specifically, the heating pipe 1 can limit the air flow direction, the electric heating plate 11 can heat the air, the limiting pipe 12 can limit the position of the fixed pipe 13, the fixed pipe 13 can limit the position of the brushless motor 14, the brushless motor 14 can drive the fan blade 15 to rotate, the fan blade 15 can generate an air flow blowing towards the electric heating plate 11 during rotation, the flow guide cover 16 can facilitate the gas to enter the connecting pipe 18, the end plate 17 can seal the rear end of the heating pipe 1, and the connecting pipe 18 can facilitate the gas to enter the receiving pipe 2.

[0029] A receiving pipe 2 is fixedly installed at the rear end of the connecting pipe 18. A feeding pipe 21 is fixedly installed above the receiving pipe 2. A support frame 22 is fixedly installed above the feeding pipe 21. A driving motor 23 is fixedly installed above the support frame 22. A limiting frame 24 is fixedly installed below the feeding pipe 21. A driving shaft 25 is inserted through the center of the limiting frame 24. A screw conveyor 26 is fixedly installed on the outer side of the driving shaft 25.

[0030] The front end of the receiving pipe 2 is communicated with the connecting pipe 18, and the upper end of the receiving pipe 2 is communicated with the feeding pipe 21. The driving motor 23 is fixed above the axis of the feeding pipe 21 through the limiting frame 24. A rotational connection is formed between the driving shaft 25 and the limiting frame 24. The upper part of the driving shaft 25 is fixedly connected to the rotating shaft of the driving motor 23 in an inserted manner. The screw conveyor 26 extends downward from the middle of the feeding pipe 21 to the bottom end of the feeding pipe 21.

[0031] Specifically, the receiving pipe 2 can limit the positions of the pulverized coal and the air flow, facilitating the air flow to drive the pulverized coal to move. The feeding pipe 21 can facilitate the receiving of the pulverized coal. The support frame 22 can limit the position of the driving motor 23. The driving motor 23 can drive the driving shaft 25 to rotate. The limiting frame 24 can limit the position of the lower end of the driving shaft 25. The driving shaft 25 can drive the screw conveyor 26 to rotate. The screw conveyor 26 can limit the speed of the pulverized coal entering the inside of the receiving pipe 2.

[0032] During use, an electric heating plate 11 is fixedly installed inside the heating pipe 1. A limiting pipe 12 is fixedly installed at the front end of the heating pipe 1. The brushless motor 14 is fixed at the front and rear ends of the fixed pipe 13 through the fixed pipe 13. When the brushless motor 14 drives the fan blade 15 to rotate, the fan blade 15 will generate an air flow blowing towards the electric heating plate 11. The temperature of the air flow rises through the electric heating plate 11. During the process of the air flow driving the pulverized coal to move backward, the pulverized coal will absorb the heat of the air flow, thereby quickly evaporating the moisture contained in the pulverized coal and achieving the preheating effect. This method can preheat the pulverized coal during the fluidization process and enable the pulverized coal to enter the blast furnace in a dry state. The screw conveyor 26 is fixedly installed on the outer side of the driving shaft 25. The upper end of the driving shaft 25 is fixedly connected to the rotating shaft of the driving motor 23, and the lower end position is restricted by the limiting frame 24. The driving motor 23 drives the driving shaft 25 to rotate to make the screw conveyor 26 drive the pulverized coal to move downward. At the same time, the outer edge of the screw conveyor 26 contacts the inner wall of the cylindrical structure at the bottom end of the feeding pipe 21. The pulverized coal needs to pass through the rotation of the screw conveyor 26 to be discharged from the bottom end of the feeding pipe 21. By adjusting the power of the driving motor 23 to limit the rotation of the screw conveyor 26, the speed of the pulverized coal entering the inside of the receiving pipe 2 is restricted, thereby avoiding the situation of pulverized coal blockage.

[0033] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A blast furnace coal powder fluidization preheating structure, characterized in that: include: A heating tube (1), wherein an electric heating plate (11) is fixedly installed inside the heating tube (1), a limiting tube (12) is fixedly installed at the front end of the heating tube (1), a fixing tube (13) is fixedly installed inside the limiting tube (12), a brushless motor (14) is fixedly installed inside the fixing tube (13), a fan blade (15) is inserted and installed outside the rotating shaft of the brushless motor (14), a flow guide cover (16) is inserted and installed at the rear end of the heating tube (1), an end plate (17) is fixedly installed at the rear end of the heating tube (1), and the end plate (17) A connecting pipe (18) is fixedly installed on the rear side, a receiving pipe (2) is fixedly installed on the rear end of the connecting pipe (18), a feed pipe (21) is fixedly installed above the receiving pipe (2), a support frame (22) is fixedly installed above the feed pipe (21), a drive motor (23) is fixedly installed above the support frame (22), a limiting frame (24) is fixedly installed below the feed pipe (21), a drive shaft (25) is inserted and installed in the center of the limiting frame (24), and a screw auger (26) is fixedly installed on the outside of the drive shaft (25).

2. A blast furnace coal powder fluidization preheating structure according to claim 1, characterized in that: The front end of the fixing tube (13) is a conical structure, and a protrusion connected to the limiting tube (12) is provided on the outer side of the fixing tube (13).

3. A blast furnace coal powder fluidization preheating structure according to claim 1, characterized in that: The brushless motor (14) is mounted on the front and rear sides of the fixed tube (13) in a mirror-symmetrical manner, and the fan blades (15) are fixedly mounted on the outside of the rotating shaft of the brushless motor (14) on the front and rear sides of the fixed tube (13).

4. A blast furnace coal powder fluidization preheating structure according to claim 1, characterized in that: The air outlet direction of the fan blade (15) is from front to back, the aperture size of the rear end of the air guide cover (16) is consistent with the aperture size of the connecting pipe (18), and the front side of the air guide cover (16) is a conical structure.

5. A blast furnace coal powder fluidization preheating structure according to claim 1, characterized in that: The front end of the receiving pipe (2) is in communication with the connecting pipe (18), and the upper end of the receiving pipe (2) is in communication with the feeding pipe (21).

6. A blast furnace coal powder fluidization preheating structure according to claim 1, characterized in that: The driving motor (23) is fixed above the axis of the feeding tube (21) via a limiting frame (24), and a rotation connection is formed between the driving shaft (25) and the limiting frame (24).

7. A blast furnace coal powder fluidization preheating structure according to claim 1, characterized in that: The upper portion of the driving shaft (25) is fixedly connected to the rotating shaft of the driving motor (23) by means of insertion, and the auger (26) extends downward from the middle of the feeding pipe (21) to the bottom end of the feeding pipe (21).

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