Atmosphere protection electroslag furnace oxygen content control device

Abstract

The utility model provides an atmosphere protection electroslag furnace oxygen content control device which comprises an upper smoke hood, a lower smoke hood, a sampler and a control box, the lower end of the upper smoke hood is connected with the upper end of the lower smoke hood, the upper end of the upper smoke hood is connected with a furnace end of an electroslag furnace, and the lower end of the lower smoke hood is connected with a crystallizer; a smoke exhaust pipe is arranged on the side wall of the upper smoke hood, the sampler is arranged on the smoke exhaust pipe, and the sampler is connected with the control box; a pipeline inflation opening is formed in the side wall of the upper smoke hood, and inflation equipment is connected with the pipeline inflation opening. The sampler monitors the oxygen content of the gas in the smoke exhaust pipe in real time, the control box controls the flow of the filled inert gas according to the oxygen content of the gas in the smoke exhaust pipe, and accurate control over the oxygen content of the atmosphere protection electroslag furnace is achieved. The gravity turning plate is arranged in the smoke exhaust pipe, so that external air can be prevented from being sucked into the furnace in the gas contraction process during smelting, and the stability of the oxygen content of gas in the electroslag furnace is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to an oxygen content control device for an atmosphere-protected electroslag furnace. Background Technology

[0002] Gas-protected electroslag furnaces are based on electroslag furnaces with the addition of inert gas protection. During normal smelting, inert gases such as argon are introduced into the crystallizer inside the furnace. Because inert gases are slightly heavier than air, the air inside the crystallizer is expelled after a certain period of time, effectively separating the electrode masterbatch from the air and avoiding the influence of hydrogen, oxygen, water vapor, etc. in the air on the smelting composition.

[0003] Before smelting, inert gas is introduced into the crystallizer of the gas-protected electroslag furnace to replace the original gas in the crystallizer's internal space. Inert gas needs to be continuously introduced during the smelting process. In current technology, this is usually done manually by opening valves, which is difficult for furnace operators to control, often resulting in excessive oxygen content in the finished product and high consumption of inert gas. Utility Model Content

[0004] The purpose of this invention is to provide an oxygen content control device for an electroslag furnace under atmosphere protection. This device can control the amount of inert gas introduced by the change of oxygen content data in the electroslag furnace, so as to reduce energy consumption while ensuring that the oxygen content of the gas in the crystallizer is within the set value.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An atmosphere-protected electroslag furnace oxygen content control device includes an upper fume hood, a lower fume hood, a sampler, and a control box. The lower end of the upper fume hood is connected to the upper end of the lower fume hood, the upper end of the upper fume hood is connected to the furnace head of the electroslag furnace, and the lower end of the lower fume hood is connected to a crystallizer. An exhaust pipe is provided on the side wall of the upper fume hood, and the sampler is mounted on the exhaust pipe and connected to the control box. A gas filling port is provided on the side wall of the upper fume hood, and a gas filling device is connected to the gas filling port. The gas filling device can fill the upper fume hood, the lower fume hood, and the crystallizer with inert gas through the gas filling port.

[0007] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the upper fume hood has a cylindrical structure, and the upper fume hood is connected to the furnace head of the electroslag furnace through a first sealing mechanism; the upper fume hood is made of stainless steel; and the inert gas is argon.

[0008] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the lower fume hood is a cylindrical structure, and the lower fume hood is connected to the upper fume hood through a second sealing mechanism. The lower fume hood is made of stainless steel. The side wall of the lower fume hood is provided with a cooling water inlet, a cooling water outlet, and a feeding port.

[0009] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the flue pipe includes a horizontal section, a first vertical section, and a second vertical section. One end of the horizontal section is connected to the upper fume hood, and the other end of the horizontal section is connected to the lower end of the first vertical section. The upper end of the first vertical section is connected to the lower end of the second vertical section. The horizontal section and the first vertical section are an integral structure. The sampler is disposed on the horizontal section.

[0010] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the inner diameter of the second vertical section is larger than the inner diameter of the first vertical section, the upper end of the first vertical section extends into the lower end of the second vertical section, and the upper end of the first vertical section is sealed to the lower end of the second vertical section; the upper end of the first vertical section is covered with a gravity flap, and when the gas pressure in the electroslag furnace is greater than 200 Pa, the gravity flap is opened to exhaust gas.

[0011] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the gravity flap includes a body and a limiting plate. The body covers the upper end of the first vertical section. One end of the body is connected to one end of the limiting plate. The axis of the body is perpendicular to the axis of the limiting plate. The body is hinged to the side wall of the first vertical section through a connector. The connector is located near one end of the body.

[0012] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, a zirconium oxide sensor is installed inside the sampler, and the sampler is connected to the flue pipe via a half-joint.

[0013] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the sampler is provided with an exhaust port, and an exhaust solenoid valve is provided at the exhaust port, the exhaust solenoid valve being connected to the control box.

[0014] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, a filter is provided at the connection between the sampler and the flue pipe, a backflush port is provided on the sampler, a backflush solenoid valve is provided at the backflush port, and the backflush solenoid valve is connected to the control box.

[0015] Furthermore, in the above-mentioned atmosphere-protected electroslag furnace oxygen content control device, the electroslag furnace has a furnace platform support column, the control box is installed on the furnace platform support column, the control box is equipped with a programmable logic controller, and the control box is equipped with a conversion display instrument.

[0016] Analysis reveals that this utility model discloses an oxygen content control device for an atmosphere-protected electroslag furnace. A sampler takes samples of the gas in the exhaust pipe and monitors the oxygen content in the gas in real time. The control box controls the flow rate of inert gas introduced by the charging equipment based on the oxygen content of the gas in the exhaust pipe, achieving precise control of the oxygen content in the atmosphere-protected electroslag furnace. This control device, by modifying the oxygen content control method, achieves precise oxygen content control while also saving argon gas consumption. By installing a gravity flap inside the exhaust pipe, external air is prevented from being drawn into the furnace during the gas contraction process during smelting, ensuring the stability of the oxygen content in the electroslag furnace. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] Figure 2 for Figure 1 An enlarged structural diagram of point A.

[0020] Figure 3 for Figure 1 A magnified structural diagram at point B.

[0021] Figure 4 This is a right-side view of the structure of the upper smoke hood after it has been raised according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1 Upper fume hood; 2 Lower fume hood; 3 Sampler; 4 Control box; 5 Furnace head; 6 Exhaust pipe; 7 Converter display instrument; 8 Pipe air inlet; 9 First sealing mechanism; 10 Second sealing mechanism; 11 Cooling water inlet; 12 Cooling water outlet; 13 Feeding port; 14 Horizontal section; 15 First vertical section; 16 Second vertical section; 17 Gravity flap; 18 Body; 19 Limiting plate; 20 Zirconia sensor; 21 Exhaust port; 22 Exhaust solenoid valve; 23 Backflush port; 24 Backflush solenoid valve; 25 Connector; 26 Filter plate. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0024] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0026] like Figures 1 to 4 As shown, according to an embodiment of the present invention, an oxygen content control device for an atmosphere-protected electroslag furnace is provided, such as... Figure 1As shown, the device includes an upper fume hood 1, a lower fume hood 2, a sampler 3, and a control box 4. The lower end of the upper fume hood 1 is connected to the upper end of the lower fume hood 2. The upper end of the upper fume hood 1 is connected to the furnace head 5 of the electroslag furnace, and the lower end of the lower fume hood 2 is connected to a crystallizer. An exhaust pipe 6 is installed on the side wall of the upper fume hood 1, and the sampler 3 is installed on the exhaust pipe 6 and connected to the control box 4. A gas filling port 8 is installed on the side wall of the upper fume hood 1, and a gas filling device is connected to the gas filling port 8. The gas filling device can fill inert gas into the upper fume hood 1, the lower fume hood 2, and the crystallizer through the gas filling port 8. The sampler 3 samples the gas in the exhaust pipe 6 and monitors the oxygen content of the gas in the exhaust pipe 6 in real time. The control box 4 controls the flow rate of inert gas filled by the gas filling device according to the oxygen content of the gas in the exhaust pipe 6, so as to achieve precise control of the oxygen content of the electroslag furnace under atmosphere protection.

[0027] Furthermore, the upper fume hood 1 has a cylindrical structure, and the upper fume hood 1 is connected to the furnace head 5 of the electroslag furnace through a first sealing mechanism 9. The first sealing mechanism 9 is used to seal the connection between the upper fume hood 1 and the furnace head 5 of the electroslag furnace. The upper fume hood 1 is made of stainless steel, and the inert gas is argon.

[0028] Furthermore, the lower fume hood 2 has a cylindrical structure and is connected to the upper fume hood 1 via a second sealing mechanism 10. The second sealing mechanism 10 is used to seal the connection between the lower fume hood 2 and the upper fume hood 1. The lower fume hood 2 is made of stainless steel. A cooling water inlet 11, a cooling water outlet 12, and a feeding port 13 are provided on the side wall of the lower fume hood 2. A cooling water channel is provided inside the lower fume hood 2, with both ends connected to the cooling water inlet 11 and the cooling water outlet 12, respectively. Cooling water is injected into the cooling water channel through the cooling water inlet 11 to cool the lower fume hood 2, effectively preventing deformation and extending its service life. The feeding port 13 is used to add slag to the electroslag furnace.

[0029] Furthermore, the exhaust pipe 6 includes a horizontal section 14, a first vertical section 15, and a second vertical section 16. One end of the horizontal section 14 is connected to the upper smoke hood 1, and the other end of the horizontal section 14 is connected to the lower end of the first vertical section 15. The upper end of the first vertical section 15 is connected to the lower end of the second vertical section 16. The horizontal section 14 and the first vertical section 15 are an integral structure. The sampler 3 is installed on the horizontal section 14.

[0030] Furthermore, the inner diameter of the second vertical section 16 is larger than that of the first vertical section 15. The upper end of the first vertical section 15 extends into the lower end of the second vertical section 16, and the upper end of the first vertical section 15 and the lower end of the second vertical section 16 are sealed together. The upper end of the first vertical section 15 is covered with a gravity flap 17. When the gas pressure in the electroslag furnace is greater than 200 Pa, the gravity flap 17 is opened to exhaust gas. During smelting, the gravity flap 17 ensures the sealing performance of the first vertical section 15 and prevents external air from being drawn into the furnace during the gas contraction process in the electroslag furnace, thus ensuring the stability of the oxygen content in the gas inside the electroslag furnace.

[0031] Furthermore, such as Figure 3 As shown, the gravity flap 17 includes a body 18 and a limiting plate 19. The body 18 covers the upper end of the first vertical section 15, and one end of the body 18 is connected to one end of the limiting plate 19. The axis of the body 18 is perpendicular to the axis of the limiting plate 19. The body 18 is hinged to the side wall of the first vertical section 15 through a connector 25, which is close to one end of the body 18. When the body 18 is pushed open, the other end of the body 18 moves away from the first vertical section 15, and the lower end of the limiting plate 19 can contact the side wall of the first vertical section 15. The limiting plate 19 can limit the opening range of the body 18. When the gas pressure inside the electroslag furnace is less than 200 Pa, the body 18, under its own gravity, covers the first vertical section 15 again and seals the upper end of the first vertical section 15 to prevent external air from being drawn into the furnace.

[0032] Furthermore, such as Figure 2 As shown, a zirconia sensor 20 is installed inside the sampler 3. The zirconia sensor 20 can detect the oxygen content of the gas in the exhaust pipe 6 in real time. The zirconia sensor 20 is connected to the control box 4. The sampler 3 is connected to the exhaust pipe 6 through a half-joint. This arrangement makes it convenient to inspect and maintain the sampler 3.

[0033] Furthermore, the sampler 3 is provided with an exhaust port 21, and an exhaust solenoid valve 22 is provided at the exhaust port 21. The exhaust solenoid valve 22 is connected to the control box 4. The control box 4 can control the exhaust solenoid valve 22 to open periodically. The sampler 3 uses the exhaust port 21 to exhaust gas, thereby ensuring the flow of gas in the sampler 3 and the accuracy of the sampler 3 in sampling the gas.

[0034] Furthermore, a filter element 26 is installed at the connection between the sampler 3 and the exhaust pipe 6. The filter element 26 is used to filter the dust generated during electroslag furnace smelting. The sampler 3 is equipped with a backflush port 23, and a backflush solenoid valve 24 is installed at the backflush port 23. The backflush solenoid valve 24 is connected to the control box 4, and the control box 4 can control the backflush solenoid valve 24 to open periodically, realizing the automatic backflush and cleaning function of the sampler 3. The automatic backflush of the sampler 3 can clean the dust on the filter element 26, prevent the sampler 3 from sticking, and thus ensure the detection accuracy of the sampler 3.

[0035] Furthermore, such as Figure 4 As shown, the electroslag furnace has a furnace platform support column, and the control box 4 is installed on the furnace platform support column. The control box 4 is equipped with a programmable logic controller (PLC) and a conversion display instrument 7. The zirconia sensor 20 is matched with the conversion display instrument 7. The conversion display instrument 7 can display the oxygen content data in the electroslag furnace in real time. The field data is displayed synchronously on the host computer, providing data support for the adjustment of the mass flow meter of the gas charging equipment.

[0036] Before smelting begins, a large flow of argon gas is introduced into the crystallizer to quickly replace the gas inside with argon gas. At the same time, the exhaust solenoid valve 22 of the sampler 3 is opened. When the oxygen content in the crystallizer drops to the set value, the exhaust solenoid valve 22 closes and switches to the automatic control program. The PLC automatically adjusts the argon gas injection flow rate of the argon mass flow meter of the gas filling equipment according to the oxygen content value fed back by the zirconia sensor 20 to ensure that the oxygen content of the gas in the crystallizer is within the set value. During this process, the exhaust solenoid valve 22 of the sampler 3 is opened periodically at a set time to exhaust gas to ensure the gas flow detection in the sampler 3.

[0037] This control device, by modifying the oxygen content control method, enables precise control of the oxygen content in the electroslag furnace while also saving argon gas consumption. Compared with manual purging, inert gas consumption is reduced from 83.71 m³ / ton. 3 Reduced to 30.27m per ton of steel. 3 .

[0038] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0039] An oxygen content control device for an atmosphere-protected electroslag furnace includes a sampler 3 that samples the gas in the exhaust pipe 6 to monitor the oxygen content in real time. A control box 4 controls the flow rate of inert gas introduced by the charging equipment based on the oxygen content in the exhaust pipe 6, achieving precise control of the oxygen content in the atmosphere-protected electroslag furnace. This control device, after being modified to control oxygen content, achieves precise oxygen content control while also saving argon gas consumption. By installing a gravity flap 17 inside the exhaust pipe 6, external air is prevented from being drawn into the furnace during gas contraction during smelting, ensuring the stability of the oxygen content in the electroslag furnace.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for controlling oxygen content in an atmosphere-protected electroslag furnace, characterized in that, It includes an upper fume hood, a lower fume hood, a sampler, and a control box, among which, The lower end of the upper fume hood is connected to the upper end of the lower fume hood, the upper end of the upper fume hood is connected to the furnace head of the electroslag furnace, and the lower end of the lower fume hood is connected to a crystallizer. A smoke exhaust pipe is provided on the side wall of the upper smoke hood, and the sampler is installed on the smoke exhaust pipe and connected to the control box; The upper fume hood is provided with a pipe inflation port on its side wall, and an inflation device is connected to the pipe inflation port. The inflation device can fill the upper fume hood, the lower fume hood and the crystallizer with inert gas through the pipe inflation port.

2. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, The upper fume hood has a cylindrical structure, and the upper fume hood is connected to the furnace head of the electroslag furnace through a first sealing mechanism; The upper smoke hood is made of stainless steel; The inert gas is argon.

3. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, The lower smoke hood has a cylindrical structure, and the lower smoke hood is connected to the upper smoke hood through a second sealing mechanism. The lower smoke hood is made of stainless steel. The side wall of the lower fume hood is provided with a cooling water inlet, a cooling water outlet, and a feeding port.

4. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, The exhaust pipe includes a horizontal section, a first vertical section, and a second vertical section. One end of the horizontal section is connected to the upper smoke hood, and the other end of the horizontal section is connected to the lower end of the first vertical section. The upper end of the first vertical section is connected to the lower end of the second vertical section. The horizontal section and the first vertical section are an integral structure. The sampler is positioned on the horizontal segment.

5. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 4, characterized in that, The inner diameter of the second vertical segment is larger than the inner diameter of the first vertical segment, the upper end of the first vertical segment extends into the lower end of the second vertical segment, and the upper end of the first vertical segment and the lower end of the second vertical segment are sealed together. The upper end of the first vertical section is covered with a gravity flap. When the gas pressure inside the electroslag furnace is greater than 200 Pa, the gravity flap is opened to exhaust gas.

6. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 5, characterized in that, The gravity flap includes a body and a limiting plate. The body covers the upper end of the first vertical section. One end of the body is connected to one end of the limiting plate. The axis of the body is perpendicular to the axis of the limiting plate. The body is hinged to the side wall of the first vertical section through a connector. The connector is located near one end of the body.

7. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, The sampler is equipped with a zirconium oxide sensor, and the sampler is connected to the exhaust pipe via a split joint.

8. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, The sampler is provided with an exhaust port, and an exhaust solenoid valve is provided at the exhaust port. The exhaust solenoid valve is connected to the control box.

9. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, A filter is provided at the connection between the sampler and the exhaust pipe. The sampler is provided with a backflush port, and a backflush solenoid valve is provided at the backflush port. The backflush solenoid valve is connected to the control box.

10. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that, The electroslag furnace has a furnace platform support column, the control box is installed on the furnace platform support column, the control box is equipped with a programmable logic controller, and the control box is equipped with a conversion display instrument.

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