Electroslag process bottom argon blowing device

Abstract

The utility model discloses a kind of electric-shock process bottom argon blowing devices, including bottom water tank (1), the upper side of bottom water tank (1) is sequentially provided with crystallizer (2) and smoke cover (3), electrode (4) is equipped in crystallizer (2), the upper end of electrode (4) is provided with the false electrode (5) of protruding crystallizer (2) and smoke cover (3), the bottom surface of crystallizer (2) is equipped with annular gas flushing groove (6), the outer side wall of crystallizer (2) is equipped with the argon flushing hole (7) of connecting gas flushing groove (6), the bottom surface of crystallizer (2) is equipped with multiple ventilation grooves (8), the outer side end of ventilation groove (8) is connected gas flushing groove (6), the inner side end of ventilation groove (8) is connected the inner wall of crystallizer (2).The utility model has the advantages of improving electric-shock effect.

Description

Technical Field

[0001] This utility model belongs to the field of electroslag furnaces, and particularly relates to a bottom argon blowing device for electroslag processes. Background Technology

[0002] The existing structure of electroslag furnaces, such as Figure 3 As shown, the system includes a bottom water tank, with a crystallizer and a fume hood arranged sequentially on the upper side of the bottom water tank. Electrodes are installed inside the crystallizer, and dummy electrodes protruding from the upper ends of the electrodes extend from the crystallizer and the fume hood. An exhaust pipe is installed on the fume hood. During the smelting process, argon gas needs to be introduced into the crystallizer to displace the air inside, reducing the oxygen content and improving the smelting effect. In existing electroslag furnaces, argon gas is introduced into the upper part of the crystallizer. However, in practice, it has been found that the efficiency of air displacement is relatively low. Experimental statistics show that after 30 minutes of high-flow-rate argon blowing (300 L / min), the oxygen content at the bottom of the crystallizer is still 3000-5000 ppm, and the rate of oxygen content reduction is very slow as the blowing time continues. Due to the high oxygen content inside the crystallizer, the electroslag effect is poor, which can also be inferred from the dark oxide on the surface of the electroslag ingot. Utility Model Content

[0003] The purpose of this invention is to provide a bottom argon blowing device for the electroslag process. This invention has the advantage of improving the electroslag effect.

[0004] The technical solution of this utility model is as follows: A bottom argon blowing device for electroslag processes includes a bottom water tank, a crystallizer and a fume hood are arranged sequentially on the upper side of the bottom water tank, an electrode is provided inside the crystallizer, a dummy electrode is provided at the upper end of the electrode extending out of the crystallizer and the fume hood, an annular air-purging groove is provided on the bottom surface of the crystallizer, an argon-purging hole connected to the air-purging groove is provided on the outer side wall of the crystallizer, and multiple ventilation grooves are provided on the bottom surface of the crystallizer, the outer end of the ventilation groove is connected to the air-purging groove, and the inner end of the ventilation groove is connected to the inner wall of the crystallizer.

[0005] In the aforementioned bottom argon blowing device for the electroslag process, the multiple ventilation slots are evenly distributed circumferentially, and the ventilation slots point towards the axis of the crystallizer.

[0006] In the aforementioned bottom argon blowing device for the electroslag process, the diameter of the argon-blowing hole is 2 mm, the argon-blowing hole is inclined, and the outer end of the argon-blowing hole is higher than the inner end of the argon-blowing hole.

[0007] In the aforementioned bottom argon blowing device for the electroslag process, the argon blowing hole is connected to an argon source through an argon pipeline, and the argon pipeline is equipped with a valve, a pressure sensor, and a flow meter.

[0008] In the aforementioned bottom argon blowing device for the electroslag process, an oxygen analyzer is installed on the fume hood, and the detection end of the oxygen analyzer enters the fume hood.

[0009] Compared with existing technologies, this invention introduces argon gas from the bottom of the crystallizer, which has an annular purging groove at the bottom. The introduced argon gas is evenly distributed circumferentially within the purging groove and then enters the crystallizer through multiple venting channels. This allows for rapid upward expulsion of air from the bottom of the crystallizer, reducing the oxygen content inside and improving the electroslag remelting effect. Testing showed that after 30 minutes of high-flow-rate argon blowing (300 L / min), the oxygen content at the bottom of the crystallizer was ≤100 ppm. Therefore, this invention has the advantage of improving the electroslag remelting effect.

[0010] In addition, by combining an oxygen analyzer and a flow meter, the oxygen content inside the crystallizer is monitored, and the argon flow rate is adjusted according to the oxygen content to further ensure that the oxygen content inside the crystallizer does not exceed the standard. Attached Figure Description

[0011] Figure 1 This is a front view schematic diagram of this utility model.

[0012] Figure 2 This is a schematic diagram of the bottom of the crystallizer of this utility model.

[0013] Figure 3 This is a schematic diagram of the working principle of an existing electroslag furnace.

[0014] The labels in the attached diagram are: 1-bottom water tank, 2-crystallizer, 3-fume hood, 4-electrode, 5-dummy electrode, 6-gas flushing tank, 7-argon flushing hole, 8-ventilation tank, 9-argon gas pipeline, 10-valve, 11-pressure sensor, 12-flow meter, 13-oxygen analyzer. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] Example 1: A bottom argon blowing device for an electroslag process, such as Figure 1 As shown, it includes a bottom water tank 1, with a crystallizer 2 and a smoke hood 3 arranged sequentially on the upper side of the bottom water tank 1. An electrode 4 is provided inside the crystallizer 2, and a dummy electrode 5 extending out of the crystallizer 2 and the smoke hood 3 is provided at the upper end of the electrode 4. Its features are as follows: The bottom surface of the crystallizer 2 is provided with an annular gas filling groove 6, and the outer wall of the crystallizer 2 is provided with an argon filling hole 7 connected to the gas filling groove 6. The bottom surface of the crystallizer 2 is provided with eight circumferentially evenly distributed ventilation grooves 8, which point to the axis of the crystallizer 2. The outer end of the ventilation groove 8 is connected to the gas filling groove 6, and the inner end of the ventilation groove 8 is connected to the inner wall of the crystallizer 2.

[0017] The argon-filling hole 7 has a diameter of 2 mm and is inclined, with its outer end higher than its inner end. There are two argon-filling holes 7, located on opposite sides of the crystallizer 2. Both holes 7 are connected to an argon source (such as an argon cylinder) via the same argon gas pipeline 9. The argon gas pipeline 9 is equipped with a valve 10, a pressure gauge, and a flow meter 12. In the direction of argon gas flow, the pressure gauge is located behind the valve 10, and the flow meter 12 is located behind the pressure gauge. The pressure gauge integrates a pressure sensor 11; the pressure gauge model is, for example, MIK-P400.

[0018] The smoke hood 3 is equipped with an oxygen meter 13, and the detection end of the oxygen meter 13 enters the smoke hood 3.

[0019] Working Principle: In the electroslag process, molten steel flows downwards, and electroslag ingots form from the bottom of crystallizer 2, growing upwards. The ingots lose heat through the bottom water tank, causing their temperature to drop and their volume to shrink, forming a vertical channel between them and crystallizer 2. Valve 10 is opened, allowing argon gas to enter the bottom of crystallizer 2 through argon gas pipe 9, argon flushing hole 7, purging groove 6, and ventilation groove 8, spreading upwards and exiting through the exhaust pipe of fume hood 3. During this process, a pressure gauge displays the internal pressure of argon gas pipe 9, and a flow meter 12 detects the argon gas flow rate. An oxygen analyzer 13 detects the oxygen content inside fume hood 3. When the oxygen content is too high, the opening of valve 10 is increased to increase the argon gas flow rate, thus reducing the oxygen content. Before smelting, a large flow of argon gas can be used to essentially purge the air; during the smelting process, a small flow of argon gas is continuously supplied.

[0020] Example 2: Based on Example 1, it also includes a PLC controller. Valve 10, pressure sensor 11, flow meter 12 and oxygen analyzer 13 are all connected to the PLC controller. The PLC controller model is, for example, fx2n.

[0021] During the pretreatment stage (20 minutes before smelting), argon gas is blown in at a high flow rate from the bottom of the crystallizer to remove air from the furnace as quickly as possible. During the smelting aeration stage (after the slag pool melts), bottom argon blowing is performed at a flow rate of 5-10 L / min based on real-time pressure monitoring. In the final stage (after the steel ingot has solidified 80%), the PLC automatically reduces the opening of valve 10 to 10% to maintain a smaller flow rate of air until complete solidification. Input signals for the PLC controller: Pressure sensor (4-20mA) → PLC analog input module; Flow meter (4-20mA) → PLC analog input module; Oxygen analyzer (4-20mA) → PLC analog input module; PLC controller output signals: PLC analog output module → valve (4-20mA); PLC digital output module → alarm light (triggered when pressure < 0.1MPa or oxygen content > 30ppm); Human-machine interaction: The PLC is connected to the touch screen via Ethernet, which can set the target oxygen content for each stage (e.g., 18-22ppm), PID parameters (proportional coefficient P=5, integral time I=10s, derivative time D=2s), and flow limit (e.g., 8L / min).

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A bottom argon blowing device for an electroslag process, comprising a bottom water tank (1), a crystallizer (2) and a fume hood (3) sequentially arranged on the upper side of the bottom water tank (1), an electrode (4) arranged inside the crystallizer (2), and a dummy electrode (5) extending out of the crystallizer (2) and the fume hood (3) at the upper end of the electrode (4), characterized in that: The bottom surface of the crystallizer (2) is provided with an annular gas filling groove (6), and the outer side wall of the crystallizer (2) is provided with an argon filling hole (7) that connects to the gas filling groove (6). The bottom surface of the crystallizer (2) is provided with multiple ventilation grooves (8), the outer end of the ventilation groove (8) is connected to the gas filling groove (6), and the inner end of the ventilation groove (8) is connected to the inner wall of the crystallizer (2).

2. The bottom argon blowing device for the electroslag process according to claim 1, characterized in that: The multiple ventilation slots (8) are evenly distributed circumferentially, and the ventilation slots (8) point to the axis of the crystallizer (2).

3. The bottom argon blowing device for the electroslag process according to claim 1, characterized in that: The diameter of the argon-filling hole (7) is 2 mm. The argon-filling hole (7) is set at an angle, and the outer end of the argon-filling hole (7) is higher than the inner end of the argon-filling hole (7).

4. The bottom argon blowing device for the electroslag process according to claim 1, characterized in that: The argon-filled hole (7) is connected to an argon source through an argon pipeline (9), and the argon pipeline (9) is equipped with a valve (10), a pressure sensor (11), and a flow meter (12).

5. The bottom argon blowing device for the electroslag process according to claim 1, characterized in that: The smoke hood (3) is equipped with an oxygen meter (13), and the detection end of the oxygen meter (13) enters the smoke hood (3).

Images