Coal injection mechanism of steelmaking converter

Abstract

The utility model relates to the technical field of steelmaking blast furnaces, and discloses a steelmaking converter coal injection mechanism which comprises a shell, a feeding hopper is arranged at one end of the shell, a discharging pipe is arranged at the other end of the shell, a smashing mechanism is installed in the shell, and a coal injection assembly is installed on the discharging pipe. The crushing mechanism comprises a central shaft, and three crushing discs and an impeller are mounted on the central shaft; the coal injection assembly comprises a protective shell, a communicating pipe is arranged at the bottom of the protective shell, a distributor is installed in the protective shell, a plurality of channels are formed between the distributor and the inner wall of the protective shell, coal injection pipes are connected to the positions, corresponding to the channels, of the upper portion of the side face of the protective shell, and an anti-blocking assembly is installed on the coal injection assembly. The anti-blocking assembly comprises an air guide pipe and a material guide pipe, a plurality of first branch pipes are installed on the air guide pipe and connected to the coal injection pipe, and a plurality of second branch pipes are installed on the material guide pipe and connected to the head of the channel. When the channel is blocked, the channel can be cleaned without stopping coal injection, and normal production of equipment is not affected.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking converter technology, specifically a pulverized coal injection mechanism for a steelmaking converter. Background Technology

[0002] The pulverized coal injection mechanism in a steelmaking converter is an important piece of equipment in the ironmaking process. Its main function is to precisely inject pulverized coal into the converter to accelerate the chemical reaction inside the converter and improve the converter's efficiency and output.

[0003] Because coal contains some fibrous materials, which remain in fibrous form during the pulverization process, and also contains wood or plastic materials mixed in, forming impurities, these impurities enter the pulverized coal injection system along with the coal dust. This can lead to coal dust entering the pulverized coal distributor, gradually reducing the size of the distributor outlet or causing blockages, resulting in uneven pulverization across the distributor's branches, or even insufficient pulverization of the specified amount of coal.

[0004] In response to this situation, the usual measures are to stop pulverized coal injection and manually clean the pulverized coal distributor. Pulverized coal injection is often stopped 1-2 times a week, each time for more than 30 minutes, which affects production. Utility Model Content

[0005] The technical problem this invention aims to solve is that when the coal injection distributor of the existing coal injection mechanism is blocked, coal injection needs to be stopped and manually cleaned, which affects normal production.

[0006] To solve the above problems, the technical solution of this utility model is: a pulverized coal injection mechanism for steelmaking converter, including a shell, a feeding hopper at one end of the shell, a discharge pipe at the other end, a crushing mechanism installed inside, and a pulverized coal injection assembly installed on the discharge pipe;

[0007] The crushing mechanism includes a central shaft that passes through and is rotatably mounted on the housing, three crushing discs are mounted on the central shaft, and an impeller is mounted on the outer side of the central shaft at the end away from the feeding hopper;

[0008] The pulverized coal injection assembly includes a protective shell, a connecting pipe at the bottom of the protective shell, a distributor installed inside, multiple channels formed between the distributor and the inner wall of the protective shell, a pulverized coal injection pipe connected to the upper side of the protective shell at the position corresponding to each channel, and an anti-clogging component installed on the pulverized coal injection assembly.

[0009] The anti-blocking component includes an air guide pipe and a material guide pipe. Multiple branch pipes are installed on the air guide pipe and connected to the pulverized coal injection pipe. Multiple branch pipes are installed on the material guide pipe and connected to the head of the channel.

[0010] Furthermore, the housing is provided with three crushing chambers and one pulverizing chamber, the three crushing discs are respectively located in the three crushing chambers, the impeller is located in the pulverizing chamber, and the discharge pipe is located on the lower side of the pulverizing chamber.

[0011] Furthermore, the diameters of the three crushing discs gradually increase, with the crushing disc closest to the feed hopper having the smallest diameter; a retaining ring is provided between every two crushing chambers and between the crushing chamber and the pulverized coal injection chamber.

[0012] Furthermore, a pulley is installed at one end of the central shaft after it passes through the end face of the housing.

[0013] Furthermore, a pulley is installed at one end of the central shaft after it passes through the end face of the housing.

[0014] Furthermore, both the connecting pipe and the discharge pipe are equipped with flanges, and the two flanges are connected and fixed by bolts and nuts.

[0015] Furthermore, solenoid valves are installed on branch pipe one, branch pipe two, and pulverized coal injection pipe, with the valve on the pulverized coal injection pipe located at the end furthest from the protective casing.

[0016] The advantages of this utility model compared with the existing technology are as follows: When a channel is blocked, the solenoid valve on the corresponding coal injection pipe is closed, and the solenoid valves on the corresponding branch pipe one and branch pipe two are opened. The high-pressure airflow generated by the air pump back-blown the coal injection pipe and channel, causing the blocked coal powder to enter the collection box through branch pipe two for collection. There is no need to stop coal injection and manual cleaning, and it does not affect the normal production of the equipment. Attached Figure Description

[0017] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 .

[0018] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 .

[0019] Figure 3 This is a cross-sectional view of the casing of this utility model.

[0020] Figure 4 This is a cross-sectional view of the protective shell of this utility model.

[0021] As shown in the figure: 1. Shell; 2. Feed hopper; 3. Discharge pipe; 4. Central shaft; 5. Crushing disc; 6. Impeller; 7. Protective shell; 8. Connecting pipe; 9. Distributor; 10. Pulverized coal injection pipe; 11. Air guide pipe; 12. Material guide pipe; 13. Branch pipe one; 14. Branch pipe two; 15. Retaining ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 and Figure 2 As shown, a pulverized coal injection mechanism for a steelmaking converter includes a housing 1, a feeding hopper 2 at one end of the housing 1, a discharge pipe 3 at the other end, a crushing mechanism installed inside, and a pulverized coal injection assembly installed on the discharge pipe 3.

[0024] like Figure 1 and Figure 3 As shown, the crushing mechanism includes a central shaft 4 that passes through and is rotatably mounted on the housing 1. Three crushing discs 5 are mounted on the central shaft 4. An impeller 6 is mounted on the outer side of the central shaft 4 at the end away from the feeding hopper 2. The housing 1 has three crushing chambers and one pulverized coal injection chamber. The three crushing discs 5 are located in the three crushing chambers respectively. The impeller 6 is located in the pulverized coal injection chamber. The discharge pipe 3 is located on the lower side of the pulverized coal injection chamber. The diameters of the three crushing discs 5 gradually increase, and the diameter of the crushing disc 5 closest to the feeding hopper 2 is the smallest. A retaining ring 15 is provided between every two crushing chambers and between the crushing chamber and the pulverized coal injection chamber. A pulley is installed after one end of the central shaft 4 passes through the end face of the housing 1.

[0025] The coal can be crushed by the three crushing discs 5. The coal powder enters the pulverized coal injection chamber under the action of the rotating impeller 6 and is discharged through the discharge pipe 3.

[0026] like Figure 2 and Figure 3 As shown, the pulverized coal injection assembly includes a protective shell 7, a connecting pipe 8 at the bottom of the protective shell 7, and a distributor 9 installed inside. Multiple channels are formed between the distributor 9 and the inner wall of the protective shell 7. A pulverized coal injection pipe 10 is connected to the upper side of the protective shell 7 at the position corresponding to each channel. Both the connecting pipe 8 and the discharge pipe 3 are equipped with flanges, and the two flanges are connected and fixed by bolts and nuts.

[0027] The pulverized coal discharged from the discharge pipe 3 enters the protective shell 7 through the connecting pipe 8, and is evenly distributed to each channel under the action of the distributor 9, and then sprayed out through the pulverized coal injection pipe 10.

[0028] like Figure 2 and Figure 4As shown, an anti-clogging component is installed on the pulverized coal injection assembly. The anti-clogging component includes an air guide pipe 11 and a material guide pipe 12. Multiple branch pipes 13 are installed on the air guide pipe 11 and are connected to the pulverized coal injection pipe 10. Multiple branch pipes 14 are installed on the material guide pipe 12 and are connected to the head of the channel. Solenoid valves are installed on the branch pipes 13, 14, and pulverized coal injection pipe 10. The valve on the pulverized coal injection pipe 10 is located at the end away from the protective shell 7.

[0029] Connect the air guide pipe 11 to the air pump and the material guide pipe 12 to the collection box. When a channel becomes blocked, close the solenoid valve on the corresponding pulverized coal injection pipe 10 and open the solenoid valves on the corresponding branch pipe 13 and branch pipe 2 14. The high-pressure airflow generated by the air pump back-blown the pulverized coal injection pipe 10 and the channel, causing the blocked coal powder to enter the collection box through branch pipe 2 14 for collection. After the channel is cleared, open the solenoid valve on the pulverized coal injection pipe 10 and close the solenoid valves on the corresponding branch pipe 13 and branch pipe 2 14.

[0030] Therefore, this device does not require stopping coal injection or manual cleaning, and does not affect the normal production of the equipment.

[0031] The parts not disclosed in this utility model are all prior art, and their specific structures and working principles will not be described in detail.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0034] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A coal injection mechanism for a steelmaking converter, comprising a housing (1) having a feed hopper (2) at one end and a discharge pipe (3) at the other end, and a crushing mechanism installed inside the housing (1), wherein a coal injection assembly is installed on the discharge pipe (3), the crushing mechanism comprises a central shaft (4) penetrating and rotatably installed in the housing (1), and three crushing discs (5) are installed on the central shaft (4), and an impeller (6) is installed on the outer side of the central shaft (4) at the end away from the feed hopper (2), characterized in that: the coal injection assembly comprises a protective shell (7) having a communication pipe (8) at the bottom and a distributor (9) installed inside, a plurality of passages are formed between the distributor (9) and the inner wall of the protective shell (7), a coal injection pipe (10) is connected to the corresponding position of each passage on the upper side of the protective shell (7), and an anti-blocking assembly is installed on the coal injection assembly. The anti-blocking assembly comprises a gas guide pipe (11) and a material guide pipe (12), a plurality of branch pipes I (13) are installed on the gas guide pipe (11), the branch pipes I (13) are connected to the coal injection pipe (10), a plurality of branch pipes II (14) are installed on the material guide pipe (12), and the branch pipes II (14) are connected to the head of the passage. The housing (1) is internally provided with three crushing cavities and a coal injection cavity, the three crushing discs (5) are respectively located in the three crushing cavities, the impeller (6) is located in the coal injection cavity, and the discharge pipe (3) is located at the lower side of the coal injection cavity.

2. A coal injection system for a steelmaking vessel as claimed in claim 1 wherein: The diameters of the three crushing discs (5) gradually increase, and the diameter of the crushing disc (5) closest to the feed hopper (2) is the smallest; a blocking ring (15) is arranged between each two crushing cavities and between the crushing cavity and the coal injection cavity.

3. A coal injection system for a steelmaking vessel as claimed in claim 2, wherein: A pulley is installed at one end of the central shaft (4) after penetrating the end face of the housing (1).

4. A coal injection system for a steelmaking vessel as defined in claim 1, characterized in that: Flanges are arranged on the communication pipe (8) and the discharge pipe (3), and the two flanges are connected and fixed by bolts and nuts.

5. A coal injection system for a steelmaking vessel as defined in claim 1, wherein: Valves are installed on the branch pipes I (13), the branch pipes II (14) and the coal injection pipe (10), and the valve on the coal injection pipe (10) is located at the end away from the protective shell (7).

6. A coal injection system for a steelmaking vessel as defined in claim 1, characterized in that: ​

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