Atmosphere protection electroslag furnace oxygen content control device

Abstract

The invention 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, and the control box controls the flow of the inert gas filled by the gas filling equipment according to the oxygen content of the gas in the smoke exhaust pipe, so that the oxygen content of the atmosphere protection electroslag furnace is accurately controlled. 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] The present invention relates to the technical field of metallurgical equipment, and particularly relates to an oxygen content control device for an atmosphere-protected electroslag furnace. Background Art

[0002] The gas-protected electroslag furnace adds inert gas protection on the basis of the electroslag furnace, that is, during the normal smelting process, inert gas such as argon is filled into the mold in the furnace. Because the specific gravity of the inert gas is slightly larger than that of air, after a certain period of time, the air inside the mold can be discharged, effectively separating the electrode masterbatch from the air and avoiding the influence of hydrogen, oxygen, water vapor, etc. in the air on the smelting components.

[0003] Before smelting, inert gas is filled into the mold of the gas-protected electroslag furnace to replace the original gas in the internal space of the mold. During the smelting process, inert gas also needs to be continuously filled. In the prior art, usually, the valve is manually opened to inflate, and it is difficult for the furnace operator to control the valve opening, often resulting in the oxygen content of the smelting product exceeding the standard and a large consumption of inert gas. Summary of the Invention

[0004] The purpose of the present invention is to provide an oxygen content control device for an atmosphere-protected electroslag furnace, which can control the filling amount of inert gas according to 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 mold is within the set value.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] An oxygen content control device for an atmosphere-protected electroslag furnace, comprising an upper hood, a lower hood, a sampler and a control box. Among them, the lower end of the upper hood is connected to the upper end of the lower hood, the upper end of the upper hood is connected to the furnace head of the electroslag furnace, and the lower end of the lower hood is connected to a mold; a smoke exhaust pipe is arranged on the side wall of the upper hood, the sampler is arranged on the smoke exhaust pipe, and the sampler is connected to the control box; a pipeline gas filling port is arranged on the side wall of the upper hood, and a gas filling device is connected to the pipeline gas filling port. The gas filling device can fill inert gas into the upper hood, the lower hood and the mold through the pipeline gas filling port.

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

[0008] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, the lower hood is of a cylindrical structure, and the lower hood is connected to the upper hood through a second sealing mechanism. The material of the lower hood is stainless steel; a cooling water inlet, a cooling water outlet, and a feeding port are provided on the side wall of the lower hood.

[0009] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, 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 hood, 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, and the horizontal section and the first vertical section are of an integral structure; the sampler is provided on the horizontal section.

[0010] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, the inner diameter of the second vertical section is larger than that 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 hermetically connected to the lower end of the second vertical section; a gravity flap is covered on the upper end of the first vertical section. When the gas pressure in the electroslag furnace is greater than 200 Pa, the gravity flap is pushed open for exhaust.

[0011] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, the gravity flap includes a body and a limit plate. The body covers the upper end of the first vertical section; one end of the body is connected to one end of the limit plate, the axis of the body is perpendicular to the axis of the limit plate, and the body is hinged to the side wall of the first vertical section through a connecting piece, and the connecting piece is close to one end of the body.

[0012] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, a zirconia sensor is provided in the sampler, and the sampler is connected to the exhaust pipe through a half-coupling joint.

[0013] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, an exhaust port is provided on the sampler, and an exhaust solenoid valve is provided at the exhaust port. The exhaust solenoid valve is connected to the control box.

[0014] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, a filter sheet is provided at the connection between the sampler and the exhaust pipe, an anti-blowing port is provided on the sampler, and an anti-blowing solenoid valve is provided at the anti-blowing port. The anti-blowing solenoid valve is connected to the control box.

[0015] Further, in the above oxygen content control device for an atmosphere-protected electroslag furnace, the electroslag furnace has a furnace platform support column, the control box is installed on the furnace platform support column, a programmable logic controller is arranged inside the control box, and a conversion display instrument is arranged on the control box.

[0016] Analysis shows that the present invention discloses an oxygen content control device for an atmosphere-protected electroslag furnace. The sampler samples the gas in the exhaust pipe to monitor the oxygen content of the gas in the exhaust pipe in real time. The control box controls the flow rate of the inert gas filled by the gas filling device according to the oxygen content of the gas in the exhaust pipe, realizing precise control of the oxygen content of the atmosphere-protected electroslag furnace. After the control device is transformed into an oxygen content control mode, the oxygen content is precisely controlled while the consumption of argon is saved. By arranging a gravity flap in the exhaust pipe, external air can be prevented from being sucked into the furnace during the gas contraction process during smelting, ensuring the stability of the gas oxygen content in the electroslag furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The schematic diagrams in the specification forming a 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 improper limitation to the present invention. Among them:

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

[0019] Figure 2 is Figure 1 an enlarged structural diagram of part A of

[0020] Figure 3 is Figure 1 an enlarged structural diagram of part B of

[0021] Figure 4 is a right view structural diagram of the upper smoke hood after lifting in an embodiment of the present invention.

[0022] Explanation of reference numerals: 1 upper smoke hood; 2 lower smoke hood; 3 sampler; 4 control box; 5 furnace head; 6 exhaust pipe; 7 conversion display instrument; 8 pipeline gas filling port; 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 back blowing port; 24 back blowing solenoid valve; 25 connecting piece; 26 filter element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention rather than a limitation thereof. In fact, those skilled in the art will appreciate that modifications and variations can be made to the present invention without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Accordingly, it is intended that the present invention cover such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0024] In the description of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. The terms "connected", "coupled", and "disposed" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate member; it can be a wired connection, a radio connection, or a wireless communication signal connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and alphabetical labels to refer to features in the drawings. Similar or like labels in the drawings and the description have been used to refer to similar or like parts of the present invention. As used herein, terms such as "first", "second", and "third" can be used interchangeably to distinguish one member from another, and are not intended to indicate the position or importance of individual members.

[0026] As Figures 1 to 4 shown, according to an embodiment of the present invention, an oxygen content control device for an atmosphere-protected electroslag furnace is provided, as Figure 1As shown in the figure, the device includes an upper smoke hood 1, a lower smoke hood 2, a sampler 3 and a control box 4. Among them, the lower end of the upper smoke hood 1 is connected to the upper end of the lower smoke hood 2, the upper end of the upper smoke hood 1 is connected to the furnace head 5 of the electroslag furnace, and the lower end of the lower smoke hood 2 is connected to a mold; a smoke exhaust pipe 6 is arranged on the side wall of the upper smoke hood 1, the sampler 3 is arranged on the smoke exhaust pipe 6, the sampler 3 is connected to the control box 4, a pipeline gas inlet 8 is arranged on the side wall of the upper smoke hood 1, and an inflation device is connected to the pipeline gas inlet 8. The inflation device can fill inert gas into the upper smoke hood 1, the lower smoke hood 2 and the mold through the pipeline gas inlet 8. The sampler 3 samples the gas in the smoke exhaust pipe 6 to monitor the oxygen content of the gas in the smoke exhaust pipe 6 in real time. The control box 4 controls the flow rate of the inert gas filled by the inflation device according to the oxygen content of the gas in the smoke exhaust pipe 6, so as to achieve precise control of the oxygen content of the atmosphere-protected electroslag furnace.

[0027] Further, the upper smoke hood 1 is of a cylindrical structure, and the upper smoke 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 smoke hood 1 and the furnace head 5 of the electroslag furnace; the material of the upper smoke hood 1 is stainless steel; the inert gas is argon.

[0028] Further, the lower smoke hood 2 is of a cylindrical structure, and the lower smoke hood 2 is connected to the upper smoke hood 1 through a second sealing mechanism 10. The second sealing mechanism 10 is used to seal the connection between the lower smoke hood 2 and the upper smoke hood 1; the material of the lower smoke hood 2 is stainless steel; a cooling water inlet 11, a cooling water outlet 12 and a feeding port 13 are arranged on the side wall of the lower smoke hood 2. A cooling water channel is arranged inside the lower smoke hood 2, and both ends of the cooling water channel are respectively connected to the cooling water inlet 11 and the cooling water outlet 12. Injecting cooling water into the cooling water channel from the cooling water inlet 11 can cool the lower smoke hood 2, effectively prevent the lower smoke hood 2 from deforming and extend its service life. The feeding port 13 is used to add slag material into the electroslag furnace.

[0029] Further, the smoke 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, 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, and the horizontal section 14 and the first vertical section 15 are of an integral structure; the sampler 3 is arranged on the horizontal section 14.

[0030] Further, 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 is hermetically connected to the lower end of the second vertical section 16. 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 pushed open for exhaust. During smelting, the setting of the gravity flap 17 ensures the sealing performance of the first vertical section 15, and can prevent external air from being sucked into the furnace during the gas contraction process of the electroslag furnace, ensuring the stability of the gas oxygen content in the electroslag furnace.

[0031] Further, as Figure 3 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. 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 connecting piece 25, and the connecting piece 25 is close to one end of the body 18. When the body 18 is pushed open, the other end of the body 18 is 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 opening amplitude of the body 18 can be limited through the limiting plate 19. When the gas pressure in the electroslag furnace is less than 200 Pa, the body 18 covers the first vertical section 15 again under the action of its own gravity and seals the upper end of the first vertical section 15 to prevent external air from being sucked into the furnace.

[0032] Further, as Figure 2 shown, a zirconia sensor 20 is arranged in the sampler 3. The zirconia sensor 20 can real-time detect the oxygen content of the gas in the exhaust pipe 6. The zirconia sensor 20 is connected to the control box 4. The sampler 3 and the exhaust pipe 6 are connected through a half-coupling joint. Such a setting can facilitate the maintenance of the sampler 3.

[0033] Further, an exhaust port 21 is arranged on the sampler 3. An exhaust solenoid valve 22 is arranged at the exhaust port 21. The exhaust solenoid valve 22 is connected to the control box 4. The control box 4 can control the periodic opening of the exhaust solenoid valve 22. The sampler 3 exhausts gas through the exhaust port 21, which can ensure the gas fluidity in the sampler 3 and the accuracy of gas sampling by the sampler 3.

[0034] Further, a filter sheet 26 is provided at the connection between the sampler 3 and the exhaust pipe 6. The filter sheet 26 is used to filter the dust generated during the electroslag furnace smelting. An anti-blowing air port 23 is provided on the sampler 3, and an anti-blowing air solenoid valve 24 is provided at the anti-blowing air port 23. The anti-blowing air solenoid valve 24 is connected to the control box 4, and the control box 4 can control the anti-blowing air solenoid valve 24 to be periodically opened to realize the automatic back-blowing and cleaning functions of the sampler 3. The automatic back-blowing of the sampler 3 can clean the dust on the filter sheet 26 to prevent the sampler 3 from sticking, thereby ensuring the detection accuracy of the sampler 3.

[0035] Further, as Figure 4 shown, the electroslag furnace has a furnace platform support column, and the control box 4 is installed on the furnace platform support column. A programmable logic controller (PLC) is provided in the control box 4, and a conversion display instrument 7 is provided on the control box 4. The zirconia sensor 20 is parameter-matched with the conversion display instrument 7, and the oxygen content data in the electroslag furnace can be real-time displayed through the conversion display instrument 7. The on-site data is synchronously displayed on the upper computer, providing data support for the adjustment of the mass flowmeter of the gas charging device.

[0036] Before the smelting starts, a large flow of argon gas is filled into the mold to quickly replace the gas inside with argon. At the same time, the exhaust solenoid valve 22 of the sampler 3 is opened. When the oxygen content in the mold is reduced to the set value, the exhaust solenoid valve 22 is closed, and at the same time, it is switched to the automatic control program. The PLC automatically adjusts the argon gas filling flow of the argon gas mass flowmeter of the gas charging device according to the oxygen content value fed back by the zirconia sensor 20 to ensure that the oxygen content of the gas in the mold is within the set value. During this process, the exhaust solenoid valve 22 of the sampler 3 is periodically opened for exhaust through the set time to ensure the gas flow detection in the sampler 3.

[0037] By transforming the oxygen content control method, the control device enables the oxygen content in the electroslag furnace to be accurately controlled while also saving the consumption of argon gas. Compared with manual gas filling, the consumption of inert gas is reduced from 83.71 m 3 per ton of steel to 30.27 m 3 .

[0038] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0039] An oxygen content control device for an atmosphere-protected electroslag furnace. The sampler 3 samples the gas in the exhaust pipe 6 to monitor the oxygen content of the gas in the exhaust pipe 6 in real time. The control box 4 controls the flow rate of the inert gas filled by the gas filling equipment 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 atmosphere-protected electroslag furnace. After the control device is transformed into an oxygen content control mode, the oxygen content is precisely controlled while the consumption of argon is saved. By setting a gravity flap 17 in the exhaust pipe 6, it is possible to prevent external air from being sucked into the furnace during the gas contraction process during smelting, ensuring the stability of the gas oxygen content in the electroslag furnace.

[0040] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oxygen content control device for an atmosphere-protected electroslag furnace, characterized in that: It includes an upper smoke hood, a lower smoke hood, a sampler and a control box, among which: The lower end of the upper smoke hood is connected to the upper end of the lower smoke hood, the upper end of the upper smoke hood is connected to the furnace head of the electroslag furnace, and the lower end of the lower smoke hood is connected to 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 to the control box; A pipeline charging port is arranged on the side wall of the upper smoke hood, and a charging device is connected to the pipeline charging port. The charging device can charge inert gas into the upper smoke hood, the lower smoke hood and the crystallizer through the pipeline charging port.

2. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that: The upper smoke hood is a cylindrical structure, and the upper smoke 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 is a cylindrical structure, the lower smoke hood is connected to the upper smoke hood via a second sealing mechanism, and the material of the lower smoke hood is stainless steel; A cooling water inlet, a cooling water outlet and a feeding port are arranged on the side wall of the lower smoke hood.

4. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that: The smoke exhaust pipe comprises 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, 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, and the horizontal section and the first vertical section are an integrated structure; The sampler is arranged on the horizontal section.

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 section is greater 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 and connected 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 pushed open for exhaust.

6. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 5, characterized in that: The gravity flap includes a main body and a limit plate, the main body covers the upper end of the first vertical section; one end of the main body is connected to one end of the limit plate, the axis of the main body is perpendicular to the axis of the limit plate, and the main body is hinged to the side wall of the first vertical section through a connecting member, and the connecting member is close to one end of the main body.

7. The oxygen content control device for an atmosphere-protected electroslag furnace according to claim 1, characterized in that: A zirconium oxide sensor is arranged in the sampler, and the sampler is connected to the smoke exhaust pipe through a Hough 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, an exhaust solenoid valve is provided at the exhaust port, and 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 smoke exhaust pipe, a back-blowing air port is provided on the sampler, a back-blowing air solenoid valve is provided at the back-blowing air port, and the back-blowing air 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 is provided with a furnace platform supporting column, the control box is installed on the furnace platform supporting column, a programmable logic controller is arranged in the control box, and a conversion display instrument is arranged on the control box.

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