Blast furnace coal injection gun device capable of preventing air-break countercurrent

Abstract

The utility model discloses a blast furnace coal injection gun device capable of preventing wind-cut countercurrent, which comprises a spray gun body and is characterized in that a ball valve is mounted at one end of the spray gun body, a non-return structure is mounted at one end of the ball valve, and a metal hose is mounted at one end of the non-return structure; the utility model relates to the technical field of blast furnace combustion coal supply equipment, which is characterized in that a cylinder is kept in a contraction state, so that pulverized coal smoothly flows through a metal hose and an extension pipe to a sealing box, flows to a check valve through a gap between a sealing barrel and the sealing box, enters a spray gun body through the check valve and a ball valve, and is sprayed out from the spray gun body; when coal injection air is weakened or converted into nitrogen for injection, the check valve effectively prevents high-temperature gas in the furnace from flowing back to the metal hose, the metal hose is protected from being damaged, the service life is prolonged, meanwhile, the air cylinder extends, the sealing barrel is tightly attached to the inner wall of the sealing box, the piston head is sealed under the action of the spring, high-temperature gas backflow when the check valve fails is effectively prevented, and the service life is prolonged. The safety of the metal hose is further ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of blast furnace combustion coal supply equipment, specifically a blast furnace coal injection gun device to prevent air interruption and backflow. Background Technology

[0002] The current trend in blast furnace development at ironmaking plants is towards larger equipment and more comprehensive backup facilities. This significantly improves overall equipment operating efficiency but also extends maintenance cycles. However, during long periods of continuous production, fluctuations in pulverized coal injection airflow, especially during nitrogen injection switching, can cause high-temperature gases to backflow from the injection lance if the pressure inside the blast furnace is lower than the pressure or if the injection is interrupted. This can lead to burn-out of the metal hose, requiring shutdown for maintenance and severely impacting production. Replacing the metal hose is a direct solution, but it only addresses the symptoms, not the root cause. A more fundamental measure is to effectively prevent the backflow of high-temperature gases inside the furnace. Therefore, a blast furnace pulverized coal injection lance device to prevent backflow during air interruption is designed.

[0003] While existing technologies may already offer solutions to the aforementioned problems, this case aims to provide an alternative or replacement technical solution. Utility Model Content

[0004] To solve the problems mentioned in the background art, the present invention is achieved through the following technical solution: a blast furnace pulverized coal injection gun device for preventing air interruption and backflow, including a pulverized coal injection gun body, a ball valve installed at one end of the pulverized coal injection gun body, a backflow prevention structure installed at one end of the ball valve, and a metal hose installed at one end of the backflow prevention structure.

[0005] The check valve structure includes a check valve, which is installed at one end of a ball valve. A sealing box is installed at one end of the check valve, and an extension tube is inserted into one end of the sealing box. A metal flexible tube is installed at one end of the extension tube.

[0006] A cylinder is inserted into the side wall of the sealed box near the extension tube. A closed cylinder is installed at the telescopic end of the cylinder. The closed cylinder is coaxially installed with the ball valve. A spring column is installed on the inner wall of the closed cylinder. A piston head is installed at one end of the spring column. The piston head is movably attached to the inner wall of the closed cylinder. A distance measuring instrument is installed on the inner wall of the closed cylinder. The distance measuring instrument is installed correspondingly to the piston head.

[0007] Preferably, the end of the sealed cylinder near the cylinder has a hemispherical structure, and the end of the sealed box near the check valve has a hemispherical structure.

[0008] Preferably, an alarm is installed on the upper wall of the enclosed cylinder.

[0009] Preferably, a sealing ring is installed at one end of the closed cylinder.

[0010] Preferably, the number of cylinders is at least two.

[0011] Preferably, the check valve, extension pipe, cylinder and sealing box are all sealed connections.

[0012] Beneficial effects

[0013] This utility model provides a blast furnace pulverized coal injection lance device to prevent backflow during air interruption. Compared with the prior art, it has the following advantages: The cylinder maintains a contracted state, allowing pulverized coal to flow smoothly through the metal hose, extension pipe, and sealing box. It then flows through the gap between the sealing cylinder and the sealing box to the check valve, and through the check valve and ball valve into the lance body, before being ejected from the lance body. When the pulverized coal injection air weakens or is switched to nitrogen injection, the check valve effectively prevents high-temperature gas from flowing back into the metal hose, protecting it from damage and extending its service life. Simultaneously, the cylinder extends, tightly fitting the sealing cylinder against the inner wall of the sealing box, and the piston head forms a seal under the action of the spring, effectively preventing high-temperature gas backflow when the check valve fails, further ensuring the safety of the metal hose. A ranging instrument monitors the piston head position in real time; once high-temperature gas backflow due to check valve failure is detected, an alarm is triggered, promptly reminding the user to replace the check valve, thereby ensuring the continuous and stable operation of the blast furnace and improving overall production efficiency and safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main cross-sectional structure of a blast furnace pulverized coal lance device for preventing air interruption and backflow according to the present invention.

[0015] Figure 2 This is a partial frontal three-dimensional structural schematic diagram of a blast furnace pulverized coal lance device for preventing air interruption and backflow according to the present invention.

[0016] Figure 3 This is a partial rear-view three-dimensional structural schematic diagram of a blast furnace pulverized coal lance device for preventing air interruption and backflow according to this utility model.

[0017] In the diagram: 1. Spray gun body, 2. Ball valve, 3. Metal hose, 4. Check valve, 5. Sealing box, 6. Extension tube, 7. Cylinder, 8. Sealing cylinder, 9. Spring column, 10. Piston head, 11. Rangefinder, 12. Alarm, 13. Sealing ring. Detailed Implementation

[0018] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Example: Those skilled in the art shall connect all electrical components and their compatible power supplies in this case with wires, and select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence shall refer to the working principle described below, in which the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, without explaining the electrical control.

[0020] Please see Figure 1-3 In order to solve the problem that when the coal injection gun encounters an air shortage, the high-temperature gas in the furnace will backflow, and the high-level gas will flow back from the injection gun, which will cause the metal hose 3 to burn out, this technical solution is designed. The detailed technical solution is as follows.

[0021] A blast furnace pulverized coal injection gun device for preventing air interruption and backflow includes a lance body 1, a ball valve 2 installed at one end of the lance body 1, a backflow prevention structure installed at one end of the ball valve 2, and a metal hose 3 installed at one end of the backflow prevention structure.

[0022] It should be noted that the coal powder conveying system is usually equipped with a controller. For the specific structure and working principle of the controller, please refer to the 6ES7 288-1SR60-0AA0 / 0AA1 model PLC controller. The coal powder flows from the metal hose 3 to the check valve structure, and then passes through the ball valve 2 and is sprayed out from the spray gun body 1.

[0023] Specifically, the check valve structure includes a check valve 4, which is installed at one end of the ball valve 2. A sealing box 5 is installed at one end of the check valve 4, and an extension tube 6 is inserted into one end of the sealing box 5. A metal flexible hose 3 is installed at one end of the extension tube 6.

[0024] Specifically, a cylinder 7 is inserted into the side wall of the sealed box 5 near the extension tube 6. A closed cylinder 8 is installed at the telescopic end of the cylinder 7. The closed cylinder 8 is coaxially installed with the ball valve 2. A spring column 9 is installed on the inner wall of the closed cylinder 8. A piston head 10 is installed at one end of the spring column 9. The piston head 10 is movably attached to the inner wall of the closed cylinder 8. A distance measuring instrument 11 is installed on the inner wall of the closed cylinder 8. The distance measuring instrument 11 and the piston head 10 are installed correspondingly to each other.

[0025] As a preferred and further option, an alarm 12 is installed on the upper wall of the enclosed cylinder 8;

[0026] It should be noted that during normal pulverized coal injection, cylinder 7 is in a retracted state, and there is a gap between the sealed cylinder 8 and the sealing box 5. Pulverized coal flows from the metal hose 3 to the extension pipe 6, then into the sealing box 5, and flows through the gap between the sealed cylinder 8 and the sealing box 5 to the check valve 4. After passing through the check valve 4 and the ball valve 2, it enters the spray gun body 1 and is then sprayed out from the spray gun body 1. The ball valve 2 is used to regulate the flow rate of pulverized coal. When the pulverized coal injection air is reduced or when the pulverized coal injection air is switched to nitrogen injection, the check valve 4 prevents the high-temperature gas in the furnace from flowing back through the spray gun to the metal hose 3, protecting the metal hose 3, preventing it from burning, ensuring normal production, and extending the service life of the metal hose 3. When the pulverized coal injection air is reduced or when the pulverized coal injection air is switched to nitrogen injection, the operator controls the cylinder 7 to extend to its limit position through the controller. At this time, the cylinder 7 pushes the sealed cylinder 8 to tighten. The piston head 10 is tightly fitted to the inner wall of the sealing box 5 under the action of the spring column 9, sealing the connection between the sealing box 5 and the check valve 4. This prevents high-temperature gas from entering the sealing box 5 through the check valve 4 and then flowing back into the metal hose 3 if the check valve 4 fails. At the same time, the distance measuring instrument 11 monitors the position of the piston head 10 in real time. If the check valve 4 fails and causes the metal gas to flow back, the high-temperature gas pushes the piston head 10, causing it to move in the closed cylinder 8. The spring column 9 is compressed, and the closed cylinder 8 can contain the high-temperature gas, further ensuring the safety of the metal hose 3. At this time, the distance measuring instrument 11 detects a change in the position of the piston head 10. The controller receives the signal sent by the distance measuring instrument 11, and the alarm 12 is activated, prompting the staff that the check valve 4 is damaged and to replace the check valve 4 in time to ensure the continuous and stable operation of the blast furnace.

[0027] As a preferred and further option, the end of the sealed cylinder 8 near the cylinder 7 is a hemispherical structure, which facilitates the smooth passage of coal powder through the sealed cylinder 8, and the end of the sealed box 5 near the check valve 4 is a hemispherical structure, which facilitates the smooth discharge of coal powder from the sealed box 5.

[0028] As a preferred and further option, a sealing ring 13 is installed at one end of the closed cylinder 8 to improve the sealing coefficient between the closed cylinder 8 and the sealing box 5.

[0029] Preferably, the number of cylinders 7 is at least 2;

[0030] As a preferred and further option, the check valve 4, extension pipe 6, cylinder 7, and sealing box 5 are all connected in a sealed manner.

[0031] 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.

Claims

1. A blast furnace pulverized coal injection lance device for preventing air interruption and backflow, comprising a lance body (1), characterized in that, A ball valve (2) is installed at one end of the spray gun body (1), a check valve structure is installed at one end of the ball valve (2), and a metal hose (3) is installed at one end of the check valve structure. The check valve structure includes a check valve (4), which is installed at one end of the ball valve (2). A sealing box (5) is installed at one end of the check valve (4), and an extension tube (6) is inserted into one end of the sealing box (5). The metal hose (3) is installed at one end of the extension tube (6). A cylinder (7) is inserted into the side wall of the sealed box (5) near the extension tube (6). A closed cylinder (8) is installed at the telescopic end of the cylinder (7). The closed cylinder (8) is coaxially installed with the ball valve (2). A spring column (9) is installed on the inner wall of the closed cylinder (8). A piston head (10) is installed at one end of the spring column (9). The piston head (10) is movably attached to the inner wall of the closed cylinder (8). A distance measuring instrument (11) is installed on the inner wall of the closed cylinder (8). The distance measuring instrument (11) and the piston head (10) are installed correspondingly to each other.

2. The blast furnace pulverized coal injection lance device for preventing air interruption and backflow as described in claim 1, characterized in that, The sealed cylinder (8) has a hemispherical structure at the end near the cylinder (7), and the sealed box (5) has a hemispherical structure at the end near the check valve (4).

3. The blast furnace pulverized coal injection lance device for preventing air interruption and backflow as described in claim 1, characterized in that, An alarm (12) is installed on the upper wall of the enclosed cylinder (8).

4. The blast furnace pulverized coal injection lance device for preventing air interruption and backflow according to claim 1, characterized in that, A sealing ring (13) is installed at one end of the closed cylinder (8).

5. A blast furnace pulverized coal injection lance device for preventing air interruption and backflow according to claim 1, characterized in that, The number of cylinders (7) is at least two.

6. The blast furnace pulverized coal injection lance device for preventing air interruption and backflow according to claim 1, characterized in that, The check valve (4), extension pipe (6), cylinder (7) and sealing box (5) are all sealed connections.

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