High-temperature gate valve with coal gas purging function for steelmaking converter flue

Abstract

The utility model relates to a high-temperature gate valve for a steelmaking converter flue with a coal gas purging function, which comprises a connecting flange, the connecting flange is arranged between two sections of vaporization flues, a cooling ring pipe is arranged in the connecting flange, the cooling ring pipe is tightly attached to the inner wall of the connecting flange, and the cooling ring pipe is connected with the inner wall of the connecting flange. A cooling water inlet and a cooling water outlet are formed in the cooling ring pipe, a coiled pipe is arranged on the inner side of the cooling ring pipe and is coiled on the inner side of the cooling ring pipe, a nitrogen sealing ring pipe is arranged on the front side of the coiled pipe, and the back face of the nitrogen sealing ring pipe is attached to the front face of the coiled pipe; a nitrogen inlet is formed in the nitrogen sealing ring pipe and connected with an external nitrogen input pipe, nozzles are arranged on the front face of the nitrogen sealing ring pipe, and the nozzles are distributed on the nitrogen sealing ring pipe by a circle. The inner wall of the flue is subjected to nitrogen purging, gas explosion is prevented, and safe operation of the flue is ensured. The device is compact in structure, simple to operate, safe and reliable, the labor intensity of workers is reduced, and the safety of steelmaking is improved.

Description

Technical Field

[0001] The utility model relates to a high-temperature plug valve for a steelmaking converter flue with a gas purging function. Background Art

[0002] Converter steelmaking is the main steelmaking technology in iron and steel production. The flue gas generated contains a large amount of waste heat and chemical energy, but it also has the characteristics of discontinuous flue gas generation, high dust content, and being flammable and explosive. At present, the waste heat recovery of converter flue gas has not effectively utilized the heat of the low-temperature flue gas after the flue gas temperature drops to 850 °C. Iron and steel enterprises try to recover and utilize as much converter waste heat steam as possible and utilize the waste heat of the low-temperature converter flue gas. The transformation of the low-temperature flue gas waste heat recovery project requires the use of a high-temperature plug valve for the flue. This plug valve has a large diameter (DN3000 - DN4000), needs to withstand high-temperature flue gas of about 1000 °C, and there is gas accumulation in the dead corner area of the inner wall of the flue, which is prone to explosion. Content of the Utility Model

[0003] The high-temperature plug valve for a steelmaking converter flue with a gas purging function of the utility model can, while withstanding high-temperature flue gas, conduct nitrogen purging on the gas in the dead corner area of the inner wall of the flue, which is safe and reliable and suitable for use in the converter flue.

[0004] The high-temperature plug valve for a steelmaking converter flue with a gas purging function of the utility model is realized as follows:

[0005] A high-temperature plug valve for a steelmaking converter flue with a gas purging function includes a connecting flange, which is installed between two vaporization flues. A cooling ring pipe is arranged inside the connecting flange. The cooling ring pipe is arranged close to the inner wall of the connecting flange, and a cooling water inlet and a cooling water outlet are arranged on the cooling ring pipe. The inner side of the cooling ring pipe is provided with a serpentine pipe, which is coiled inside the cooling ring pipe. A nitrogen seal ring pipe is arranged on the front side of the serpentine pipe. The back of the nitrogen seal ring pipe is attached to the front of the serpentine pipe. A nitrogen inlet is arranged on the nitrogen seal ring pipe and is connected to an external nitrogen input pipe. Nozzles are arranged on the front of the nitrogen seal ring pipe, and the nozzles cover a full circle of the nitrogen seal ring pipe.

[0006] The cooling water inlet and the cooling water outlet are located at opposite ends of the cooling ring pipe, and after the cooling water inlet and the cooling water outlet are connected to water pipes, they extend out of the connecting flange.

[0007] The back side of the serpentine pipe is attached to a reinforcing rib plate, and the edge of the reinforcing rib plate is fixed to the inner wall of the cooling ring pipe.

[0008] An electric control valve is installed on the nitrogen input pipe connected to the nitrogen inlet.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model prevents the explosion of gas and ensures the safe operation of the flue by setting a knife gate valve between two vaporization flues. The knife gate valve is of a serpentine tube water-cooled structure, and a nitrogen seal is arranged on the knife gate valve to blow nitrogen to the inner wall of the flue. The device has a compact structure, simple operation, safety and reliability, reduces the labor intensity of workers, and improves the safety of steelmaking. Brief Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of a high-temperature knife gate valve for a steelmaking converter flue with a gas purging function according to the utility model.

[0012] Figure 2 It is a schematic installation position diagram of a high-temperature knife gate valve for a steelmaking converter flue with a gas purging function according to the utility model.

[0013] Wherein: connecting flange 1, vaporization flue 2, cooling loop pipe 3, cooling water inlet 4, cooling water outlet 5, serpentine tube 6, stiffening rib plate 7, nitrogen seal loop pipe 8, nitrogen inlet 9, nozzle 10. Detailed Embodiment

[0014] See Figure 1 and Figure 2 A high-temperature knife gate valve for a steelmaking converter flue with a gas purging function according to the utility model includes a connecting flange 1, which is installed between two vaporization flues 2. A cooling loop pipe 3 is arranged inside the connecting flange 1. The cooling loop pipe 3 is arranged close to the inner wall of the connecting flange 1, and a cooling water inlet 4 and a cooling water outlet 5 are arranged on the cooling loop pipe 3. The cooling water inlet 4 and the cooling water outlet 5 are located at opposite ends of the cooling loop pipe 3, and after the cooling water inlet 4 and the cooling water outlet 5 are connected to a water pipe, they extend out of the connecting flange 1.

[0015] A serpentine tube 6 is arranged inside the cooling loop pipe 3. The serpentine tube 6 is coiled inside the cooling loop pipe 3, and the rear side of the serpentine tube 6 is attached to the stiffening rib plate 7, and the edge of the stiffening rib plate 7 is fixed to the inner wall of the cooling loop pipe 3.

[0016] A nitrogen seal loop pipe 8 is arranged on the front side of the serpentine tube 6. The back side of the nitrogen seal loop pipe 8 is attached to the front side of the serpentine tube 6. A nitrogen inlet 9 is arranged on the nitrogen seal loop pipe 8 and is connected to an external nitrogen input pipe. Nozzles 10 are arranged on the front side of the nitrogen seal loop pipe 8 and cover a full circle of the nitrogen seal loop pipe 8. After nitrogen is ejected from the nozzles 10, it can blow nitrogen to the inner wall of the flue to prevent the explosion of gas and ensure the safe operation of the flue.

[0017] An electric control valve is installed on the nitrogen inlet pipe connected to the nitrogen inlet 9. The electric control valve is associated and controlled with a flue gas content measuring instrument. When the CO content in the flue reaches the warning range, the opening of the electric control valve increases, the nitrogen flow rate increases, and the flue gas in the flue is quickly purged. When the CO content in the flue reaches the safe range, the opening of the electric control valve decreases, and the nitrogen flow rate decreases, thus achieving the function of saving nitrogen consumption. To ensure that the nitrogen nozzle is not damaged by high-temperature flue gas, the nitrogen flow rate needs to be set to a minimum value.

[0018] This high-temperature slide valve for a steelmaking converter flue with a gas purging function is equipped with a cooling circulating water system and a nitrogen sealing system. The cooling circulating water is in a continuous water supply mode, and the cooling circulating water can cool down the flue gas. The nitrogen sealing adjusts the nitrogen flow rate according to the CO content in the flue, and the adjustment cycle is synchronized with the steelmaking cycle, thereby preventing gas explosion and ensuring the safe operation of the flue. This device has a compact structure, simple operation, is safe and reliable, reduces the labor intensity of workers, and improves the safety of steelmaking.

Claims

1. A high-temperature slide valve for a steelmaking converter flue with a gas purging function, characterized in that: It includes a connecting flange which is installed between two sections of vaporization flue ducts. A cooling ring pipe is arranged inside the connecting flange. The cooling ring pipe is arranged closely against the inner wall of the connecting flange, and a cooling water inlet and a cooling water outlet are provided on the cooling ring pipe. A serpentine pipe is arranged inside the cooling ring pipe, and the serpentine pipe is coiled inside the cooling ring pipe. A nitrogen sealing ring pipe is arranged on the front side of the serpentine pipe, and the back surface of the nitrogen sealing ring pipe is attached to the front surface of the serpentine pipe. A nitrogen inlet is provided on the nitrogen sealing ring pipe and is connected to an external nitrogen input pipe. Nozzles are arranged on the front surface of the nitrogen sealing ring pipe and are distributed in a circle around the nitrogen sealing ring pipe.

2. The high-temperature flap valve for the converter flue with a gas purging function according to claim 1, wherein: The cooling water inlet and the cooling water outlet are located at opposite ends of the cooling ring pipe, and after the cooling water inlet and the cooling water outlet are connected to water pipes, they extend out of the connecting flange.

3. The high-temperature slide gate valve for the steelmaking converter flue with a gas purging function according to claim 1, characterized in that: The back side of the serpentine pipe is attached to a reinforcing rib plate, and the edge of the reinforcing rib plate is fixed to the inner wall of the cooling ring pipe.

4. A high-temperature plug valve for a steelmaking converter flue with a gas purging function according to claim 1, characterized in that: An electric control valve is installed on the nitrogen input pipe connected to the nitrogen inlet.

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