A water vapor isolation device for RH furnace

Abstract

The present application discloses a water vapor isolation device for an RH furnace, which is used in the field of metallurgical equipment technology, and includes an expansion joint connected to the lower end of a vacuum hopper and a control valve connected to the feed port of a vacuum tank, the expansion joint is used to connect to the inlet of the control valve, and there is a plug-in gap between the control valve and the expansion joint. It also includes an isolation plate and a drive unit, and the drive unit is connected to the isolation plate and is used to push the isolation plate into the plug-in gap to separate the control valve and the expansion joint. The expansion joint can be extended to dock with the control valve to achieve material transportation. When the vacuum tank is baked, the drive unit can push the isolation plate into the plug-in gap, and the isolation plate separates the expansion joint from the control valve, thereby preventing water vapor from entering the vacuum hopper and preventing water from accumulating in the vacuum hopper, causing the material to become damp.

Description

Technical Field

[0001] The present application relates to the field of metallurgical equipment and technology, and in particular to a water vapor isolation device for an RH furnace. Background Art

[0002] The vacuum tank is the main part of the RH (Ruhrstah Heraeus) vacuum system and one of the main devices for molten steel smelting. In order to meet the temperature requirements of the refractory materials in the vacuum tank, the temperature of the vacuum tank is generally controlled between 1000 and 1100°C. The existing technology mainly uses a top gun for baking operations. The top gun uses natural gas or coke oven gas as a combustion medium, which reacts with oxygen to produce a large amount of water vapor under high temperature conditions. The water vapor enters the vacuum hopper from the alloy flap valve from bottom to top, causing the alloy material to become damp and even water to accumulate in the vacuum hopper, which has a serious impact on the quality of the molten steel and the stability of production.

[0003] The prior art prevents water vapor from entering the vacuum hopper by installing an air blowing pipe between the discharge port of the vacuum hopper and the discharge chute to deliver purge air to the discharge chute. However, this solution cannot completely block high-temperature water vapor from entering the vacuum hopper and the discharge chute.

[0004] Therefore, how to effectively block high-temperature water vapor from entering the vacuum hopper and the material discharge chute is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0005] The purpose of the present application is to provide a water vapor isolation device for an RH furnace, which is provided with a driving part and an isolation plate. When the vacuum tank is baked, the driving part can push the isolation plate to be inserted into the plug-in gap, thereby isolating the control valve and the expansion joint, and effectively blocking high-temperature water vapor from entering the vacuum hopper and the unloading chute.

[0006] To achieve the above-mentioned purpose, the present application provides a water vapor isolation device for an RH furnace, comprising an expansion joint connected to the lower end of a vacuum hopper and a control valve connected to a feed port of a vacuum tank, the expansion joint being used to connect to the inlet of the control valve, and a plug-in gap being provided between the control valve and the expansion joint. The device also comprises an isolation plate and a driving part, wherein the driving part is connected to the isolation plate and is used to push the isolation plate into the plug-in gap to isolate the control valve and the expansion joint.

[0007] In some embodiments, the driving part is a driving cylinder, the cylinder barrel of the driving cylinder is fixedly arranged, and the piston of the driving cylinder is connected to the isolation plate.

[0008] In some embodiments, a guide mechanism is also included to guide the isolation plate to be inserted into the insertion gap.

[0009] In some embodiments, the guide mechanism includes a connecting column arranged on the outside of the control valve, the connecting column extends to the outside of the plug-in gap, and a guide spring is provided between the connecting column and the isolation plate.

[0010] In some embodiments, there are two connecting columns, and the straight line between the two connecting columns is perpendicular to the axis of the driving cylinder. There are also two guide springs, and the two guide springs are respectively connected to the two ends of the preset diameter of the isolation plate. The preset diameter is perpendicular to the driving cylinder, and the two connecting columns are respectively connected to the two guide springs.

[0011] In some embodiments, a temporary sealing mechanism is also included in the insertion gap.

[0012] In some embodiments, the temporary sealing mechanism includes a first sealing ring disposed on an end surface of the expansion joint and a second sealing ring disposed on an inlet of the control valve.

[0013] In some embodiments, the temporary sealing mechanism also includes a sealing umbrella skirt, and the outer peripheries of the first sealing ring and the second sealing ring are both provided with sealing umbrella skirts.

[0014] The water vapor isolation device for an RH furnace provided in the present application includes an expansion joint connected to the lower end of a vacuum hopper and a control valve connected to a feed port of a vacuum tank, wherein the expansion joint is used to connect to an inlet of the control valve, and a plug-in gap is provided between the control valve and the expansion joint. The device also includes an isolation plate and a driving part, wherein the driving part is connected to the isolation plate and is used to push the isolation plate into the plug-in gap to isolate the control valve and the expansion joint.

[0015] The expansion joint can be extended to connect with the control valve to realize material transportation. When the vacuum tank is baked, the drive unit can push the isolation plate into the plug-in gap. The isolation plate separates the expansion joint from the control valve, thereby preventing water vapor from entering the vacuum hopper and accumulating water in the vacuum hopper, causing the material to become damp. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of the water vapor isolation device provided in this application in the RH furnace;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the water vapor isolation device in standby state;

[0019] Figure 3for Figure 1 Structural schematic diagram of the working state of the water vapor isolation device.

[0020] in, Figures 1 to 3 The reference numerals in the drawings are:

[0021] Isolation plate 1, driving cylinder 2, guide spring 3, flap valve 4, expansion joint 5, connecting column 41. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Please refer to Figures 1 to 3 , Figure 1 A schematic diagram of the structure of the water vapor isolation device provided in this application in the RH furnace; Figure 2 for Figure 1 A schematic diagram of the structure of the water vapor isolation device in standby state; Figure 3 for Figure 1 Structural schematic diagram of the working state of the water vapor isolation device.

[0025] The structure of the water vapor isolation device for the RH furnace provided in the present application is as follows: Figure 1 As shown. The water vapor isolation device includes an expansion joint 5, a control valve and an isolation mechanism. Among them, the expansion joint 5 is connected to the lower end of the downpipe of the vacuum hopper, and the vacuum hopper includes an alloy hopper, an aluminum hopper and a carbon hopper, all of which are connected to the downpipe. The control valve is installed at the feed port of the vacuum tank, and the control valve is located below the expansion joint 5. The expansion joint 5 corresponds to the inlet position of the control valve. When the expansion joint 5 is extended, it is connected to the inlet of the control valve. The material in the vacuum hopper can pass through the expansion joint 5 and the control valve into the vacuum tank. There is a plug-in gap between the control valve and the expansion joint 5. After the control valve is disconnected from the expansion joint 5, the plug-in gap can be used for the isolation mechanism to enter; when the control valve and the expansion joint 5 are connected, the plug-in gap is closed to ensure the transportation of the material. The structure of the expansion joint 5 can refer to the existing technology and will not be repeated here. The structure of the control valve can adopt a flap valve 4. Of course, the user can also adopt a gate valve or other valves in the existing technology, which is not limited here.

[0026] The isolation mechanism includes an isolation plate 1 and a driving part. The isolation plate 1 is a circular sheet-shaped plate. The isolation plate 1 is perpendicular to the axis of the control valve and the telescopic interface. The diameter of the isolation plate 1 is larger than the diameter of the control valve inlet. The position of the isolation plate 1 corresponds to the plug-in gap. The moving end of the driving part is connected to the isolation plate 1. The driving part can insert the isolation plate 1 into the plug-in gap. The plug-in gap can prevent the water vapor in the vacuum groove from entering the telescopic joint 5. The isolation plate 1 can also be rectangular, hexagonal, etc., which is not limited here.

[0027] In some embodiments, the driving part is a driving cylinder 2, such as Figure 2 As shown, the cylinder barrel of the driving cylinder 2 is fixedly arranged by a fixing frame, etc., and a support rod can be further arranged between the cylinder barrel and the fixing frame to support the driving cylinder 2. The piston of the driving cylinder 2 is fixedly connected to the isolation plate 1 by welding or the like.

[0028] The fixing frame may also be provided with a support rail, which extends to the insertion gap, and the driving cylinder 2 and the isolation plate 1 are both provided on the support rail. The support rail can guide the isolation plate 1 to be inserted into the insertion gap, and the support rail can be connected to the outer side wall of the flap valve 4 to play a guiding role.

[0029] In some embodiments, the water vapor isolation device further includes a guide mechanism, which is located between the flap valve 4 and the isolation plate 1 , and the guide mechanism can further guide the isolation plate 1 to be inserted into the insertion gap.

[0030] In some embodiments, the guide mechanism includes a connecting column 41 and a guide spring 3. The connecting column 41 is fixedly connected to the outer side wall of the flap valve 4, and the connecting column 41 extends upward to the outside of the plug-in gap. One end of the guide spring 3 is connected to the connecting column 41, and the other end is connected to the isolation plate 1. The connecting column 41 and the outer side wall of the flap valve 4 can be spaced a certain distance apart, so that the guide spring 3 can guide the isolation plate 1 into the plug-in gap after contraction.

[0031] In some embodiments, there are two connecting pillars 41, such as Figure 2 As shown, the straight line between the two connecting columns 41 is perpendicular to the axis of the driving cylinder 2, and the distance between the two connecting columns 41 coincides with a diameter of the flap valve 4. There are also two guide springs 3, which are respectively connected to two preset points on the isolation plate 1, and the two preset points are the two ends of the preset diameter of the isolation plate 1, and the preset diameter is perpendicular to the driving cylinder 2. The two connecting columns 41 are respectively connected to the two guide springs 3.

[0032] When the vacuum tank needs to be baked, the connection between the expansion joint 5 and the flap valve 4 is disconnected, and then the driving cylinder 2 is started, the piston of the driving cylinder 2 is extended, and the isolation plate 1 is pushed into the plug-in gap, and the isolation plate 1 completely covers the inlet of the alloy flap valve 4. The isolation mechanism is in working state, isolating the soda produced by the baking of the vacuum tank from the vacuum hopper.

[0033] When the vacuum tank needs to smelt molten steel, the driving cylinder 2 is started, the piston of the driving cylinder 2 is retracted to drive the isolation plate 1 to leave the plug-in gap, and then the expansion joint 5 is connected to the flap valve 4, the isolation mechanism is in a standby state, and the connection between the vacuum hopper and the vacuum tank is connected;

[0034] When the isolation mechanism is in working state and the expansion joint 5 is at the closing limit, the top gun in the vacuum tank can perform baking operation; when the isolation mechanism is in standby state, the vacuum tank can perform smelting treatment. The control system sets interlocking conditions according to requirements, ensuring the isolation of baking soda and water and the normal feeding of the vacuum hopper during smelting. The working process of the isolation mechanism can be automatically completed under the control of the control system. The control system can refer to the DCS control system in the prior art, etc., which will not be repeated here.

[0035] In some embodiments, the water vapor isolation device further comprises a temporary sealing mechanism, which is arranged on both sides of the plug-in gap. When the isolation mechanism is in working state, the temporary sealing mechanism can cooperate with the isolation plate 1 to seal and prevent water vapor from diffusing.

[0036] In some embodiments, the temporary sealing mechanism may include a first sealing ring disposed on the end surface of the expansion joint 5 and a second sealing ring disposed at the inlet of the control valve. During the baking operation, the first sealing ring and the second sealing ring are both in contact with the isolation plate 1 to play a sealing role.

[0037] In some embodiments, the temporary sealing mechanism further includes a sealing shed, and the outer peripheries of the first sealing ring and the second sealing ring are both provided with sealing sheds. Since the diameter of the isolation plate 1 is larger than the diameter of the control valve inlet and the expansion joint 5, the outer peripheries of the isolation plate 1 and the expansion joint 5 are both provided with sealing sheds, and the sealing sheds can fit with the isolation plate 1 to further reduce water vapor leakage.

[0038] In this embodiment, when the water vapor isolation device for the RH furnace is used to bake the vacuum groove, the driving cylinder 2 can push the isolation plate 1 to insert into the plug-in gap. The isolation plate 1 separates the expansion joint 5 from the control valve to prevent the water vapor generated during the baking process from entering the vacuum hopper, thereby preventing water from accumulating in the vacuum hopper and causing the material to become damp.

[0039] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0040] The above is a detailed introduction to the water vapor isolation device for RH furnace provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A water vapor isolation device for an RH furnace, characterized in that: The invention comprises an expansion joint (5) connected to the lower end of the vacuum hopper and a control valve connected to the feed port of the vacuum tank, wherein the expansion joint (5) is used to connect to the inlet of the control valve, and a plug-in gap is provided between the control valve and the expansion joint (5). The invention also comprises an isolation plate (1) and a driving unit, wherein the driving unit is connected to the isolation plate (1) and is used to push the isolation plate (1) to be inserted into the plug-in gap to isolate the control valve and the expansion joint (5); The driving part is a driving cylinder (2), the cylinder barrel of the driving cylinder (2) is fixedly arranged, and the piston of the driving cylinder (2) is connected to the isolation plate (1); It also includes a guide mechanism for guiding the isolation plate (1) to be inserted into the insertion gap; The guide mechanism comprises a connecting column (41) arranged outside the control valve, the connecting column (41) extending to the outside of the plug-in gap, the position of the isolation plate (1) corresponding to the plug-in gap, and a guide spring (3) provided between the connecting column (41) and the isolation plate (1); There are two connecting columns (41), and the straight line between the two connecting columns (41) is perpendicular to the axis of the driving cylinder (2). There are also two guide springs (3), and the two guide springs (3) are respectively connected to the two ends of the preset diameter of the isolation plate (1), and the preset diameter is perpendicular to the driving cylinder (2). The two connecting columns (41) are respectively connected to the two guide springs (3); It also includes a temporary closing mechanism arranged in the insertion gap; The expansion joint (5) is connected to the lower end of the downpipe of the vacuum hopper, and the vacuum hopper comprises an alloy hopper, an aluminum hopper and a carbon hopper, all of which are connected to the downpipe.

2. The water vapor isolation device according to claim 1, characterized in that: The temporary sealing mechanism comprises a first sealing ring arranged on the end surface of the expansion joint (5) and a second sealing ring arranged at the inlet of the control valve.

3. The water vapor isolation device according to claim 2, characterized in that: The temporary sealing mechanism also includes a sealing umbrella skirt, and the outer periphery of the first sealing ring and the second sealing ring are both provided with the sealing umbrella skirt.

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