Electroslag furnace vacuum evacuation system

Abstract

The present application relates to the technical fields of electroslag furnace, and discloses a vacuum exhaust system of electroslag furnace, which comprises a Roots pump, a slide valve pump, a vacuum pneumatic butterfly valve, a vacuum bellows, a vacuum pipeline, a vacuum gauge, a Roots pump support, and a vacuum pump group composed of the Roots pump, the slide valve pump, the vacuum pneumatic butterfly valve, the vacuum bellows and the vacuum gauge, wherein the vacuum pump group is located at the rear of the electroslag furnace, and the pump group and the smelting furnace body of the electroslag furnace are connected by the vacuum pipeline, the vacuum bellows and the vacuum pneumatic butterfly valve. The disc-shaped composite filter screen is driven by the kinetic energy of cooling water, so that the disc-shaped composite filter screen can filter air in a rotating process, and the air can also be cooled, thereby prolonging the service life of the filter screen, and the air cooled and filtered can effectively reduce mechanical damage.

Description

Technical Field

[0001] This invention relates to the field of electroslag furnace technology, and in particular to a vacuum venting system for an electroslag furnace. Background Technology

[0002] Traditional electroslag furnace smelting equipment primarily relied on the density difference between inert protective gas and air to expel air from the furnace. This venting process was lengthy and incomplete, potentially leading to higher impurity content in the product. The current vacuum venting system removes air from the furnace before filling with inert protective gas, improving venting efficiency, reducing air content, and enhancing product quality.

[0003] Furthermore, because the air inside the electroslag furnace carries metal slag and dust, and the temperature is very high, directly drawing a vacuum will cause significant mechanical damage to the existing vacuum pump. Traditional filters do not have a cooling function, and the filters age faster at high temperatures, reducing their effective filtration life. Summary of the Invention

[0004] This invention provides a vacuum venting system for an electroslag furnace to solve the technical problems mentioned in the background art.

[0005] This invention is achieved by the following technical solution:

[0006] An electroslag furnace vacuum venting system includes a Roots pump mounted above a Roots pump support;

[0007] The slide valve pump is installed on the outlet side of the Roots pump, with its bottom plane flush with the bottom plane of the Roots pump bracket.

[0008] The Roots pump is connected to the melting furnace body by a bellows, a vacuum pneumatic butterfly valve, and a vacuum pipeline. The vacuum gauge is installed on the vacuum pipeline and located between the Roots pump and the melting furnace body.

[0009] The Roots pump and the slide valve pump are connected by a bellows, a pneumatic vacuum ball valve, and a vacuum pipeline, characterized in that;

[0010] The gas pretreatment device, connected in series in a vacuum tube, includes a rotating disc-shaped composite filter, a cooling system, and a gas path through which the air from the slag furnace passes. The cooling system is arranged in a ring around the rotating outer edge of the disc-shaped composite filter. During rotation, the disc-shaped composite filter provides a movable filter surface to filter the air passing through the gas path and increases the heat dissipation area.

[0011] In a preferred embodiment, the gas pretreatment device includes a vacuum tube and a filter cooling circulation disc. The filter cooling circulation disc has a disc-shaped cavity in the middle, and a disc-shaped composite filter is rotatably disposed inside the filter cooling circulation disc. Bearing seats are fixedly disposed on the front and rear end faces of the filter cooling circulation disc. The disc-shaped composite filter achieves stable rotation within the filter cooling circulation disc through the bearing in the bearing seat. The filter screen of the disc-shaped composite filter coincides with the flow section of the vacuum tube.

[0012] In a preferred embodiment, the disc-shaped composite filter includes a hollow metal outer disc, a metal filter, and a composite air filter. The hollow metal outer disc is located on the outermost side and has a cavity inside for installing the metal filter and the composite air filter. The hollow metal outer disc is provided with a through exhaust structure at intervals. Two metal filters are symmetrically arranged front and back and clamp and fix the composite air filter inside the hollow metal outer disc.

[0013] In a preferred embodiment, the cooling system includes a coolant ring channel. The inner wall of the filter cooling circulation disc is provided with two annular protrusion sealing ring support ribs. The outer wall of the disc-shaped composite filter is provided with two mating sealing grooves. A sealing ring is fixedly provided in the inner ring of the sealing ring support ribs and the sealing ring is sealed and disposed in the mating sealing grooves, thereby forming a coolant ring channel. The coolant ring channel contains a cooling medium.

[0014] In a preferred embodiment, in order to improve heat transfer efficiency, an actuating plate extending into the coolant channel is fixedly provided at an annular interval on the outer wall of the disc-shaped composite filter. The actuating plate may be made of corrosion-resistant aluminum alloy.

[0015] In a preferred embodiment, the cooling system further includes a cooling water inlet pipe and a cooling water outlet pipe, the cooling water inlet pipe and the cooling water outlet pipe being connected to the coolant loop, and the axes of the cooling water inlet pipe and the cooling water outlet pipe being tangent to the outer circle of the coolant loop, wherein the other end of the cooling water inlet pipe is connected to a pressurized water source, and the other end of the cooling water outlet pipe is connected to a water storage tank.

[0016] In a preferred embodiment, the system further includes a gas storage tank, a hollow metal outer disk, and a gas dispersion structure. The composite air filter is connected to the gas storage tank via a pipe, and the gas extracted from the electroslag furnace is stored in the gas storage tank after filtration. The gas dispersion structure is fixed on the filter cooling circulation disk and communicates with the inner cavity of the filter cooling circulation disk. The gas dispersion structure is connected to the exhaust port of the gas storage tank via a pipe. The hollow metal outer disk is disposed at the exhaust port of the gas storage tank. The air inlet of the gas dispersion structure is tubular, and the exhaust port extending into the inner cavity of the filter cooling circulation disk has a flat structure.

[0017] In a preferred embodiment, the filter cooling circulation disc is further provided with an air concentrator structure that is compatible with the air dispersion structure. The air concentrator structure is connected to the dust collection bag box through a pipe, and an electromagnetic butterfly valve is connected in series in the connecting pipe. The air inlet of the air concentrator structure is aligned with the exhaust port of the air dispersion structure.

[0018] In a preferred embodiment, an electromagnetic butterfly valve is provided on both the cooling water inlet pipe and the cooling water outlet pipe.

[0019] In a preferred embodiment, a dynamic sealing ring frame with a protrusion relative to the wall is fixedly provided on the end face of the disc-shaped composite filter screen pointing towards the air inlet direction of the vacuum tube. The dynamic sealing ring frame is annular and coaxial with the filter screen cooling circulation disc. A rubber sealing ring is fixedly provided at the front end of the dynamic sealing ring frame and seals against the inner wall of the filter screen cooling circulation disc.

[0020] The advantages and positive effects of this invention are:

[0021] The disc-shaped composite filter is driven by the kinetic energy of the cooling water, so that the disc-shaped composite filter can filter the air in combination with a ring filter during the rotation process, and can also cool the air. On the one hand, it can improve the life of the filter, and the cooled and filtered air can effectively reduce mechanical damage when it enters the Roots pump. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the gas path configuration of 30 in this invention;

[0025] Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure of 30 from one perspective;

[0026] Figure 4 yes Figure 2 A three-dimensional structural diagram of 30 from another perspective;

[0027] Figure 5 yes Figure 2 A structural diagram of 30 from one perspective;

[0028] Figure 6 yes Figure 2 A structural diagram of 30 from another perspective;

[0029] Figure 7 This is a three-dimensional structural diagram of 30 after being cut in the present invention;

[0030] Figure 8 This is a three-dimensional structural schematic diagram of 30 after being cut in the present invention from another perspective;

[0031] Figure 9 This is a three-dimensional structural schematic diagram of 30 after being cut in the present invention from another perspective;

[0032] Figure 10 yes Figure 7 Enlarged structural diagram at point A in the middle.

[0033] Reference numerals: 1. Roots pump; 2. Slide valve pump; 3. Vacuum pneumatic butterfly valve; 4. Bellows; 5. Vacuum pipe; 6. Vacuum gauge; 7. Roots pump bracket; 10. Vacuum tube; 11. Cooling water inlet pipe; 12. Filter cooling circulation disc; 13. Gas dispersion structure; 14. Gas concentration structure; 15. Cooling water drain pipe; 16. Bearing housing; 17. Disc-shaped composite filter screen; 18. Air filtration device; 19. Actuating plate; 20. Coolant ring channel; 21. Sealing ring support rib; 22. Sealing ring; 23. Fitting sealing groove; 24. Hollow metal outer disc; 25. Metal filter screen; 26. Composite air filter screen; 27. Dynamic sealing ring frame; 29. ​​Air storage tank; 30. Air pretreatment device; 31. Electromagnetic butterfly valve one; 32. Dust collection bag box; 33. Electromagnetic butterfly valve two. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0035] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0036] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0037] like Figure 1-10 As shown, the electroslag furnace vacuum venting system of the present invention includes:

[0038] Roots pump 1, which is mounted above Roots pump bracket 7;

[0039] The slide valve pump 2 is installed on the outlet side of the Roots pump 1, with its bottom plane flush with the bottom plane of the Roots pump bracket 7.

[0040] The Roots pump 1 is connected to the melting furnace body by a bellows 4, a vacuum pneumatic butterfly valve 3, and a vacuum pipe 5. The vacuum gauge 6 is installed on the vacuum pipe 5 and located between the Roots pump 1 and the melting furnace body.

[0041] The Roots pump 1 and the slide valve pump 2 are connected by a bellows 4, a pneumatic vacuum ball valve 9, and a vacuum pipe 5. Specifically, the vacuum gauge 6 can be an existing Pirani vacuum gauge. The Pirani vacuum gauge is fixed to the vacuum pipe 5 with an aluminum alloy clamp with a sealing structure and is connected to the vacuum pipe 5 to monitor its internal air pressure. As this is existing technology, it will not be described in detail.

[0042] The gas pretreatment device 30 is connected in series in the vacuum tube and includes a rotating disc-shaped composite filter 17, a cooling system, and a gas path through which the air from the slag furnace passes. The cooling system is arranged in a ring around the rotating outer edge of the disc-shaped composite filter 17. During rotation, the disc-shaped composite filter 17 provides a movable filter surface to filter the air passing through the gas path and transfers the heat in the air to the disc-shaped composite filter 17 and then to the cooling system to cool the air.

[0043] In a preferred embodiment, the gas pretreatment device 30 includes a vacuum tube 10 and a filter cooling circulation disc 12. The filter cooling circulation disc 12 has a disc-shaped cavity in the middle, and a disc-shaped composite filter 17 is rotatably disposed inside the filter cooling circulation disc 12. Bearing seats 16 are fixedly disposed on the front and rear end faces of the filter cooling circulation disc 12. The disc-shaped composite filter 17 rotates smoothly inside the filter cooling circulation disc 12 through the bearing in the bearing seat 16. The filter of the disc-shaped composite filter 17 coincides with the flow section of the vacuum tube 10. Since the disc-shaped composite filter 17 rotates during operation, filters can be performed at different positions, avoiding the concentration of heat and metal debris in a certain part of the disc-shaped composite filter 17 during the gas extraction process, which is beneficial to improving the cooling performance.

[0044] In a preferred embodiment, the disc-shaped composite filter 17 includes a hollow metal outer disc 24, a metal filter 25, and a composite air filter 26. The hollow metal outer disc 24 is located on the outermost side and has an internal cavity for mounting the metal filter 25 and the composite air filter 26. The hollow metal outer disc 24 is provided with through-type exhaust structures (such as...) at intervals. Figure 9The structure is a regular hexagon (or other common geometric shapes). The metal filter 25 is symmetrically arranged with two pieces and the composite air filter 26 is clamped and fixed inside the hollow metal outer disk 24. That is, when the air passes through the vacuum tube 10, it comes into contact with the hollow metal outer disk 24, the metal filter 25 and the composite air filter 26 in sequence.

[0045] In a preferred embodiment, the cooling system includes a coolant ring channel 20. Two annular protruding sealing ring support ribs 21 extend radially from the inner wall of the filter cooling circulation disc 12. Two mating sealing grooves 23 are provided on the outer wall of the disc-shaped composite filter 17. A sealing ring 22 is fixedly provided within the inner ring of the sealing ring support ribs 21, and the sealing ring 22 is sealed within the mating sealing grooves 23, thereby forming the coolant ring channel 20. During the rotation of the disc-shaped composite filter 17 relative to the filter cooling circulation disc 12, a cooling medium, such as coolant or water, is provided within the coolant ring channel 20. Through the heat transfer and rotation of the disc-shaped composite filter 17, localized heat is quickly transferred and dissipated outwards, effectively controlling the working temperature of the filter during vacuuming and thus improving the filter's service life.

[0046] In a preferred embodiment, to improve heat transfer efficiency, actuating plates 19 extending into the coolant circulation channel 20 are fixedly provided annularly at intervals on the outer wall of the disc-shaped composite filter 17. The actuating plates 19 can be made of corrosion-resistant aluminum alloy, which has the advantages of being lightweight, corrosion-resistant, and having good heat transfer performance (e.g., ...). Figure 10 ).

[0047] In a preferred embodiment, the cooling system further includes a cooling water inlet pipe 11 and a cooling water outlet pipe 15. The cooling water inlet pipe 11 and the cooling water outlet pipe 15 are connected to the coolant loop 20, and the axes of the cooling water inlet pipe 11 and the cooling water outlet pipe 15 are tangent to the outer circle of the coolant loop 20. The other end of the cooling water inlet pipe 11 is connected to a pressurized water source, and the other end of the cooling water outlet pipe 15 is connected to a water storage tank. Specifically, cooling water is injected into the cooling water inlet pipe 11 and discharged from the cooling water outlet pipe 15 through a pump. The kinetic energy of the water, combined with the actuator plate 19, drives the disc-shaped composite filter screen 17 to rotate. This eliminates the need for a drive motor for the disc-shaped composite filter screen 17, thereby improving the cooling effect and driving the disc-shaped composite filter screen 17, effectively simplifying the equipment structure.

[0048] In a preferred embodiment, the system further includes a gas storage tank 29, a hollow metal outer disk 24, and a gas dispersion structure 13. The composite air filter 26 is connected to the gas storage tank 29 via a pipe, and the gas extracted from the electroslag furnace is filtered and stored in the gas storage tank 29. It should be noted that the gas storage tank 29 is equipped with an air filtration device 18 for further filtration of the air before it enters (consistent with the prior art). The gas dispersion structure 13 is fixed on the filter cooling circulation disk 12 and communicates with the inner cavity of the filter cooling circulation disk 12. The gas dispersion structure 13 is connected to the exhaust port of the gas storage tank 29 via a pipe. The hollow metal outer disk 24 is disposed at the exhaust port of the gas storage tank 29. The air inlet of the gas dispersion structure 13 is tubular, and the exhaust port extending into the inner cavity of the filter cooling circulation disk 12 is flat. This allows the pressurized air to be discharged and back-blown onto the disc-shaped composite filter 17 using aerodynamic potential energy, causing some metal slag to detach from the disc-shaped composite filter 17 with the air.

[0049] In a preferred embodiment, the filter cooling circulation disc 12 is further provided with an air concentrating structure 14 that is matched with the air dispersion structure 13. The air concentrating structure 14 is connected to the dust collection bag box 32 through a pipe, and an electromagnetic butterfly valve 33 is connected in series in the connecting pipe. The air inlet of the air concentrating structure 14 is aligned with the exhaust port of the air dispersion structure 13. During the blowing process of the air dispersion structure 13, the air containing metal dust is blown into the dust collection bag box 32 through the air concentrating structure 14, thereby cooperating with the rotation of the disc composite filter 17 to remove the metal dust to a certain extent and maintain the air filtration effect of the disc composite filter 17.

[0050] In a preferred embodiment, an electromagnetic butterfly valve 31 is provided on each of the cooling water inlet pipe 11 and the cooling water outlet pipe 15 to maintain a seal in the non-cooled state, thereby stopping the disc-shaped composite filter screen 17 from rotating.

[0051] In a preferred embodiment, such as Figure 9 , 8 A dynamic sealing ring frame 27 with a protrusion relative to the wall is fixedly provided on the end face of the disc-shaped composite filter 17 pointing towards the air inlet direction of the vacuum tube 10. The dynamic sealing ring frame 27 is annular and coaxial with the filter cooling circulation disc 12. A rubber sealing ring is fixedly provided at the front end of the dynamic sealing ring frame 27 and seals against the inner wall of the filter cooling circulation disc 12, thereby preventing metal dust from entering the bearing seat 16.

[0052] It should be noted that the disc-shaped composite filter 17 operates at a low speed, generally less than ten revolutions per minute. Therefore, the above-mentioned sealing structure is sufficient to maintain good sealing performance. In addition, the disc-shaped composite filter 17 is driven by the kinetic energy of the cooling water, so that the disc-shaped composite filter 17 can filter the air in combination with a ring-shaped filter during the rotation process, and can also cool the air. On the one hand, it can improve the life of the filter. On the other hand, the cooled and filtered air can effectively reduce mechanical damage when it enters the Roots pump.

[0053] It should be emphasized that the embodiments described in this invention are illustrative rather than limiting. Therefore, this invention is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this invention also fall within the scope of protection of this invention.

Claims

1. An electrostatic furnace vacuum evacuation system, comprising: Roots pump (1), which is installed above the roots pump support (7); Slipper pump (2), installed in the outlet direction of the roots pump (1), the bottom plane is flush with the bottom plane of the roots pump support (7); Between the roots pump (1) and the smelting furnace body, corrugated pipe (4), vacuum pneumatic butterfly valve (3), vacuum pipeline (5) are used for connection, vacuum gauge (6) is installed on the vacuum pipeline (5) and located between the roots pump (1) and the smelting furnace body; Between the roots pump (1) and the slipper pump (2), corrugated pipe (4), pneumatic vacuum ball valve (9), vacuum pipeline (5) are used for connection, characterized in that: It also includes air pretreatment device (30), which is connected in series in the vacuum pipeline (5), including rotating disc composite filter screen (17) and cooling system and an air path for air passing through the electric slag furnace, the cooling system is annularly arranged outside the rotating edge of the disc composite filter screen (17), and the disc composite filter screen (17) provides a movable filtering surface for air filtering in the rotating process. The air pretreatment device (30) comprises a vacuum pipe (10) and a filter screen cooling circulating disc (12), a disc-shaped cavity is arranged in the middle of the filter screen cooling circulating disc (12), a disc composite filter screen (17) is rotatably arranged in the filter screen cooling circulating disc (12), bearing seats (16) are fixedly arranged at the front and rear ends of the filter screen cooling circulating disc (12), the disc composite filter screen (17) is stably rotated in the filter screen cooling circulating disc (12) through the bearings in the bearing seats (16), and the filter screen of the disc composite filter screen (17) is coincided with the flow section of the vacuum pipe (10). The disc composite filter screen (17) comprises a hollow metal outer disc (24), a metal filter screen (25) and a composite air filter screen (26), wherein the hollow metal outer disc (24) is located at the outermost side and has a cavity in the inside for mounting the metal filter screen (25) and the composite air filter screen (26), the hollow metal outer disc (24) is provided with exhaust structures penetrating through at intervals, and the metal filter screen (25) is symmetrically provided with two pieces at the front and back and clamps and fixes the composite air filter screen (26) in the hollow metal outer disc (24). The cooling system comprises a cooling liquid ring channel (20), two annular convex structure sealing ring support rib rings (21) are radially arranged on the inner wall of the filter screen cooling circulating disc (12), two matching sealing grooves (23) are arranged on the outer side wall of the disc composite filter screen (17), a sealing ring (22) is fixedly arranged in the inner ring of the sealing ring support rib ring (21), and the sealing ring (22) is sealingly arranged in the matching sealing groove (23), so as to form the cooling liquid ring channel (20), and a cooling medium is arranged in the cooling liquid ring channel (20).

2. An electroslag furnace vacuum evacuation system as defined in claim 1, wherein: The outer side wall of the disc composite filter screen (17) is annularly and fixedly provided with an actuating piece (19) extending into the cooling liquid ring channel (20), and the actuating piece (19) is made of corrosion-resistant aluminum alloy material.

3. An electrostatic furnace vacuum evacuation system according to claim 2, characterized in that: The cooling system further comprises a cooling water inlet pipe (11) and a cooling water outlet pipe (15) which are in communication with the cooling liquid ring channel (20), and the axes of the cooling water inlet pipe (11) and the cooling water outlet pipe (15) are tangent to the outer circle of the cooling liquid ring channel (20), wherein the other end of the cooling water inlet pipe (11) is in communication with a pressurized water source, and the other end of the cooling water outlet pipe (15) is in communication with a water storage tank.

4. An electrostatic furnace vacuum evacuation system according to claim 1, characterized in that: Further comprising a gas storage tank (29), a hollow metal outer disc (24), and a gas dispersion structure (13), wherein the Roots pump (1) is in communication with the gas storage tank (29) through a pipeline, and the gas extracted from the electric slag furnace is stored in the gas storage tank (29) after filtration, the gas dispersion structure (13) is fixed on the filter screen cooling circulation disc (12) and is in communication with the inner cavity of the filter screen cooling circulation disc (12), the gas dispersion structure (13) is in communication with the gas outlet of the gas storage tank (29) through a pipeline, the hollow metal outer disc (24) is arranged at the gas outlet of the gas storage tank (29), the gas inlet of the gas dispersion structure (13) is tubular, and the gas outlet of the inner cavity of the filter screen cooling circulation disc (12) is flat.

5. An electro-winning furnace vacuum evacuation system as claimed in claim 4, wherein: The filter screen cooling circulation disc (12) is further provided with a gas concentration structure (14) matched with the gas dispersion structure (13), the gas concentration structure (14) is in communication with a dust collection bag box (32) through a pipeline, and an electromagnetic butterfly valve (33) is connected in series in the communication pipeline, and the gas inlet of the gas concentration structure (14) is aligned with the gas outlet of the gas dispersion structure (13).

6. An electro-winning furnace vacuum evacuation system as claimed in claim 3, wherein: An electromagnetic butterfly valve (31) is arranged on each of the pipelines of the cooling water inlet pipe (11) and the cooling water outlet pipe (15).

7. An electrostatic furnace vacuum evacuation system according to claim 1, characterized in that: A dynamic sealing ring holder (27) protruding from the relative wall body is fixed on the end surface of the disc-shaped composite filter screen (17) pointing to the gas inlet direction of the vacuum pipe (10), the dynamic sealing ring holder (27) is annular and coaxial with the filter screen cooling circulation disc (12), a rubber sealing ring is fixed on the front end of the dynamic sealing ring holder (27) and abuts against the inner wall of the filter screen cooling circulation disc (12).

Images