A submerged arc furnace electrode sealing device

Abstract

The present invention discloses a submerged arc furnace electrode sealing device, which relates to the technical field of submerged arc furnaces. It includes: a connecting piece arranged on the electrode; at least one layer of fireproof curtain, the fireproof curtain is in a cylindrical structure, the fireproof curtain is sleeved outside the electrode, and the first end of the fireproof curtain is hermetically connected to the electrode through the connecting piece, the second end of the fireproof curtain is hermetically connected to the central furnace cover, and a sealed cavity can be formed among the connecting piece, the fireproof curtain, the central furnace cover and the electrode, the sealed cavity is isolated from the outside of the fireproof curtain, and the outer contour of the electrode hole projected along the vertical direction is located within the outer contour of the fireproof curtain projected along the vertical direction. Through multiple on-site observations and multiple transformations and experiments by the inventor, the present invention finally adopts the method of installing a connection tooling on the pressure ring and installing a fireproof curtain on the connection tooling, successfully solves the problem of unsealing of the electrode hole, and the service life of the fireproof curtain seal can reach more than two months.

Description

Technical Field

[0001] The present invention relates to the technical field of submerged arc furnaces, and particularly to an electrode sealing device for a submerged arc furnace. Background Art

[0002] In a submerged arc furnace with a pressure ring - copper bushing - double brake type electrode control device structure, production accidents such as electrode breakage often occur during production, which seriously affects the production stability of the submerged arc furnace. The main reason for the above - mentioned phenomenon is the poor sealing effect between the electrode and the electrode hole of the central furnace cover. This is also a major defect problem that cannot be solved by the equipment users and manufacturers in this field at present. The main reasons for this problem are as follows: During the production operation process, the three - phase electrodes need to move up and down in the electrode holes of the central furnace cover to adjust and balance the three - phase electrode currents. However, the above - mentioned operation will also cause a large amount of air to enter the furnace from the gap between the electrode hole and the electrode. As a result, the electrodes are severely oxidized during the production process, and continuous hard - break accidents are likely to occur. After the electrode hard - breaks, the process of restoring electrode baking is relatively slow (more than 48 hours). Each time an electrode hard - break occurs, it will directly result in the loss of the normal production capacity of the submerged arc furnace for more than 2 days, and the electrode hard - break accident will occur at least once or more times per month, seriously restricting the normal production of the submerged arc furnace. Summary of the Invention

[0003] The purpose of the present invention is to provide an electrode sealing device for a submerged arc furnace to solve the problems raised in the above - mentioned background art.

[0004] To achieve the above - mentioned purpose, the present invention provides the following technical solution: An electrode sealing device for a submerged arc furnace, comprising: a connecting piece disposed on the electrode; at least one layer of fire - proof curtain, the fire - proof curtain having a cylindrical structure, the fire - proof curtain being sleeved outside the electrode, and a first end of the fire - proof curtain being hermetically connected to the electrode through the connecting piece, a second end of the fire - proof curtain being hermetically connected to the central furnace cover, a sealed cavity being able to be formed among the connecting piece, the fire - proof curtain, the central furnace cover and the electrode, the sealed cavity being isolated from the outside of the fire - proof curtain, the outer contour of the electrode hole projected along the vertical direction being located within the outer contour of the fire - proof curtain projected along the vertical direction, the maximum length of the fire - proof curtain along the vertical direction being greater than the maximum distance along the vertical direction between the connecting piece and the central furnace cover, and the first end of the fire - proof curtain being able to generate a relative displacement with respect to the second end of the fire - proof curtain along with the electrode, the direction of the relative displacement being parallel to the axial direction of the electrode.

[0005] Preferably, in this technical solution, the inner diameter of the fire - proof curtain increases from top to bottom.

[0006] Preferably, in this technical solution, the fire - proof curtain is a curtain made of silica gel material.

[0007] Preferably, the high temperature resistance temperature of the curtain is not lower than 1200 °C, and the wall thickness of the curtain is greater than or equal to 16 mm and less than or equal to 24 mm.

[0008] Preferably, the connecting member includes: a pressure ring; a connecting tooling, the connecting tooling is sleeved outside the pressure ring, and the first end of the fireproof curtain is sleeved and fixed on the connecting tooling.

[0009] Preferably, the connecting tooling includes a pair of semi-circular rings, each of the semi-circular rings is provided with a connecting piece, and the two semi-circular rings can be spliced into a circular ring through the connecting piece, and the circular ring is adapted to the pressure ring; the inner surface of the first end of the fireproof curtain abuts against the outer surface of the circular ring through a steel tie.

[0010] Preferably, an anti-disengagement structure is further provided between the circular ring and the fireproof curtain, and the anti-disengagement structure is used to prevent the fireproof curtain from disengaging from the circular ring.

[0011] Preferably, the anti-disengagement structure includes: an annular protrusion provided at the bottom edge of the circular ring and protruding radially from the outer surface of the circular ring, and / or at least one anti-slip groove opened on the outer surface of the circular ring around the axis of the circular ring.

[0012] Preferably, the anti-disengagement structure includes: a plurality of hooks, the plurality of hooks are arranged on the outer surface of the circular ring around the circumference of the circular ring; a plurality of hanging rings corresponding to the plurality of hooks, the plurality of hanging rings are arranged at the first end of the fireproof curtain, and the corresponding hanging rings and hooks are adapted.

[0013] Preferably, the semi-circular ring includes a first semi-circular ring and a second semi-circular ring arranged in sequence from top to bottom, the wall thicknesses of the first semi-circular ring and the second semi-circular ring are the same, and the inner diameter of the first semi-circular ring is smaller than the inner diameter of the second semi-circular ring; wherein, the first semi-circular ring is used to connect with the pressure ring, and the second semi-circular ring is used to connect with the fireproof curtain.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] For this submerged arc furnace electrode sealing device, through the inventor's multiple on-site observations and multiple modifications and experiments, finally, by installing a connecting tooling on the pressure ring and installing a fireproof curtain on the connecting tooling, the problem of electrode hole unsealing is successfully solved, and the sealing service life of the fireproof curtain can reach more than two months, effectively controlling the amount of air entering the submerged arc furnace from the electrode hole and completely solving the technical problem of electrode oxidation and hard breakage.

[0016] Meanwhile, the present invention also has the following beneficial effects: it can effectively control the amount of air entering the submerged arc furnace and avoid hard breaks of the electrodes due to oxidation; it can control the leakage of flue gas dust and solve the problems of on-site dust and environmental sanitation; it can ensure the service life of the working ends of the electrodes, achieve cost reduction and efficiency improvement, and ensure stable and efficient production; it can increase the concentration of gas in the furnace for better recovery and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 is a sectional schematic diagram of the present invention;

[0019] Figure 3 is a three-dimensional view of the semi-circular ring proposed by the present invention;

[0020] Figure 4 is a front view of the semi-circular ring proposed by the present invention.

[0021] In the figures: 1, central furnace cover; 2, electrode; 3, electrode hole; 4, pressure ring; 5, connecting tooling; 51, first semi-ring; 52, second semi-ring; 53, annular protrusion; 54, connecting piece; 55, anti-slip groove; 6, fireproof curtain; 7, steel strapping; 8, sealed cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] In addition, it should be understood that for the convenience of description, the dimensions of the various components shown in the accompanying drawings are not drawn in actual proportional relationships. For example, the thickness or width of some layers may be exaggerated relative to other layers.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined or described in one drawing, further specific discussion and description thereof will not be required in the description of subsequent drawings.

[0026] As Figure 1 and Figure 2 shown, the present invention provides a technical solution: a submerged arc furnace electrode sealing device, comprising: a connecting member and a fireproof curtain 6. Among them, the connecting member is arranged on the electrode 2. The fireproof curtain 6 is in a cylindrical structure, and the fireproof curtain 6 is sleeved outside the electrode 2. The first end of the fireproof curtain 6 is hermetically connected to the electrode 2 through the connecting member, and the second end of the fireproof curtain 6 is hermetically connected to the center furnace cover 1. Thus, a sealed cavity 8 can be formed among the connecting member, the fireproof curtain 6, the center furnace cover 1 and the electrode 2, and the sealed cavity 8 is isolated from the outside of the fireproof curtain 6. From Figure 1 and Figure 2 , we can see that the electrode 2 is inside the sealed cavity 8. When the electrode 2 moves up and down, the air outside the sealed cavity 8 cannot enter the inside of the submerged arc furnace through the gap between the electrode hole 3 and the electrode 2. Furthermore, it can effectively inhibit the oxidation of the electrode 2 and prevent hard break accidents. Therefore, it should be clear that the fireproof curtain 6 needs to cover the electrode hole 3 to achieve the above effect. Therefore, the outer contour of the electrode hole 3 projected in the vertical direction needs to be located inside the outer contour of the fireproof curtain 6 projected in the vertical direction. At the same time, to ensure that the sealed cavity 8 is always airtight. The first end of the fireproof curtain 6 can generate a relative displacement relative to the second end of the fireproof curtain 6 along with the electrode 2, and the direction of this relative displacement is parallel to the axial direction of the electrode 2. That is, the first end of the fireproof curtain 6 can move up and down along with the electrode 2, while the second end of the fireproof curtain 6 is basically in a relatively static (or extremely small, negligible movement) state to maintain the airtightness of the sealed cavity 8.

[0027] It should be clear that in the present invention, the second end of the fireproof curtain 6 is lapped on the outer surface of the center furnace cover 1 by gravity. Therefore, the length of the fireproof curtain 6 in the vertical direction needs to be able to cover the maximum distance that can be generated in the vertical direction between the connecting tooling 5 and the center furnace cover 1. At the same time, the fireproof curtain 6 cannot be too long. If the length of the fireproof curtain 6 in the vertical direction is too long, then during the reciprocating movement of the electrode 2 in the vertical direction, the fireproof curtain 6 will affect the compression amount of the electrode 2 when it is compressed downward. At the same time, forced compression will also cause damage to the fireproof curtain 6. Therefore, for submerged arc furnaces of different models, the length of the fireproof curtain 6 in the vertical direction can be designed specifically, which will not be elaborated here.

[0028] It should be clear that in other embodiments of the present invention, in order for the fireproof curtain 6 to have good practicability. During the design, the inner diameter of the fireproof curtain 6 increases from top to bottom. The advantage of this design is that it can not only effectively cover the electrode holes 3. At the same time, when the electrode 2 makes a pressing-down movement, the fireproof curtain 6 will not accumulate at the bottom of the electrode 2, thus affecting the pressing-down movement of the electrode 2.

[0029] As can be seen from the above, in the present invention, the fireproof curtain 6 forms a sealed cavity 8 by its own gravity (which can refer to the structure of a dress). Therefore, it should be clear to us that the fireproof curtain 6 must have the following characteristics: insulation. Since the fireproof curtain 6 contacts the electrode 2 and also contacts the central furnace cover 1, in order to avoid the generation of electric arcs between the fireproof curtain 6 and the central furnace cover 1 during use, it is required that the fireproof curtain 6 has good insulation. Sealing property. The fireproof curtain 6 mainly functions as a seal. Therefore, the fireproof curtain 6 itself should not be breathable. Flexibility. The fireproof curtain 6 needs to be able to move up and down with the electrode 2, and its second end basically does not produce any displacement. Therefore, it needs sufficient flexibility. High temperature resistance. Since the operating environment temperature of the fireproof curtain 6 is relatively high, the fireproof curtain 6 needs to have a certain high temperature resistance performance. Crack resistance. Most materials are prone to cracking during reciprocating motion in a high temperature environment, and cracking cannot ensure the sealing property of the sealed cavity 8. Therefore, the fireproof curtain 6 in the present invention also needs to have a certain crack resistance.

[0030] In summary, in the present invention, the manufacturing material of the fireproof curtain 6 is preferably silicone with curtain characteristics. At the same time, in order to ensure that the silicone curtain can maintain good flexibility, the wall thickness of the silicone curtain is greater than or equal to 16 mm and less than or equal to 24 mm. Specifically, it can be any one of the thickness values of 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, and 24 mm. It can also be any thickness value between the above adjacent two thickness values. Preferably, the high temperature resistance temperature of the curtain is not lower than 1200 °C.

[0031] At the same time, it should be clear to us that in other embodiments of the present invention, in order to ensure that the fireproof curtain 6 has good flexibility, its thickness is designed to be relatively thin. Therefore, in order to ensure the sealing property of the sealed cavity 8, we can set several layers of fireproof curtains 6 during use.

[0032] It should be clear that in the present invention, the connecting piece can be of any structure. For example, it can be a hose clamp, pipe clamp, or steel rolling belt in the prior art, etc. (all connection structures for connecting a hard pipe and a hose can be used to replace the connecting piece in the present invention). Through a hose clamp, pipe clamp, or steel rolling belt, etc., the fireproof curtain 6 can be directly fixed on the electrode 2. Since the above connection structures are very mature prior arts, no further elaboration will be made.

[0033] In a specific embodiment of the present invention, the connector protects the pressure ring 4 and the connecting fixture 5. The pressure ring 4 is a very mature original component on the electric arc furnace, so it will not be described in detail in the present invention. The connecting fixture 5 is used to sleeve the outside of the pressure ring 4, and the first end of the fire curtain 6 is sleeved and fixed on the connecting fixture 5. During long-term use, the fire curtain 6 is a consumable part and needs to be replaced frequently. The design of the connecting fixture 5 can effectively protect the pressure ring 4. Frequent replacement operations will not cause damage to the pressure ring 4. And with the help of the pressure ring 4, it is more conducive to opening the fire curtain 6.

[0034] In a specific embodiment of the present invention, Figure 3 and Figure 4 As shown, the connecting tool 5 includes a pair of semicircular rings, each of which is provided with a connecting piece 54. The two semicircular rings can be spliced ​​into a circular ring through the connecting piece 54. The circular ring is adapted to the pressure ring 4, and the axis of the circular ring coincides with the axis of the pressure ring 4. The purpose of using semicircular rings is to facilitate the connection of the connecting tool 5 to the pressure ring 4. In other embodiments of the present invention, an integrated circular ring can be directly used to replace the above-mentioned two semicircular rings. The inner surface of the first end of the fire curtain 6 is in conflict with the outer surface of the circular ring through the steel tie 7. Of course, we can easily associate it with the fact that throat clamps or pipe clamps and other devices can also be used here instead of the steel tie 7.

[0035] It should be understood that the two semicircular rings can be welded together through the connecting piece 54 to form a circular ring. Figure 3 and Figure 4 As shown, a through hole can be opened on the connecting piece 54, and the axis of the through hole is perpendicular to the axis of the ring. Then, the two semicircular rings are fixed on the pressure ring 4 by bolts and nuts.

[0036] It should be clear that, since the first end of the fire curtain 6 needs to move up and down with the electrode 2 during use, in order to prevent the fire curtain 6 from being separated from the ring due to the long-term up and down movement of the fire curtain 6, an anti-detachment structure is also provided between the ring and the fire curtain 6, and the anti-detachment structure is used to prevent the fire curtain 6 from being separated from the ring.

[0037] Specifically, Figure 3 and Figure 4 As shown, the anti-slip structure includes: an annular protrusion 53 arranged at the bottom edge of the ring and protruding from the outer surface of the ring in the radial direction of the ring. Figure 2 As shown, when the fire curtain 6 is tied to the ring with a steel tie 7, the fire curtain 6 is difficult to be separated from the ring due to the blocking effect of the annular protrusion 53.

[0038] In another embodiment of the present invention, Figure 4As shown, the anti-slip structure includes: at least one anti-skid groove 55 is provided on the outer surface of the ring around the axis of the ring. The design of the anti-skid groove 55 can increase the friction between the fire curtain 6 and the ring, thereby making it difficult for the fire curtain 6 to detach from the ring. The design of multiple anti-skid grooves 55 is also conducive to enhancing the sealing. This technical feature can be used in conjunction with the above-mentioned annular protrusion 53, thereby enhancing the anti-slip effect.

[0039] In another embodiment of the present invention (not shown in the figure), the anti-detachment structure includes: a plurality of hooks and a one-to-one corresponding ring to the plurality of hooks, and the plurality of hooks are arranged on the outer surface of the circular ring around the circumference of the circular ring. A plurality of rings are arranged at the first end of the fire curtain 6, and the corresponding rings and hooks are adapted. When in use, the hooks are hung on the corresponding rings, and then tied to the circular ring with a steel tie 7. This design can also effectively prevent the fire curtain 6 from detaching from the circular ring. Of course, we can easily associate that in other embodiments of the present invention, alternative structures of hooks and rings can be used to replace the hooks and rings, which will not be elaborated here.

[0040] It is easy to associate that, in the present invention, the above structure can also be used to relatively fix the second end of the fire curtain 6 and the central furnace cover 1, so that the second end of the fire curtain 6 can always remain in a stationary state.

[0041] It should be clear that in one embodiment of the present invention, Figure 3 and Figure 4 As shown, the semicircular ring includes a first semi-ring 51 and a second semi-ring 52 which are arranged in sequence from top to bottom, the wall thickness of the first semi-ring 51 and the second semi-ring 52 are consistent, and the inner diameter of the first semi-ring 51 is smaller than the inner diameter of the second semi-ring 52. Among them, the first semi-ring 51 is used to connect with the pressure ring 4, and the second semi-ring 52 is used to connect with the fire curtain 6. Since the inner diameter of the second semi-ring 52 is larger than the inner diameter of the first semi-ring 51, the fire curtain 6 can be completely opened by the second semi-ring 52. Furthermore, as mentioned above, the fully opened fire curtain 6 will not hinder the pressing action during the pressing process of the electrode 2. Secondly, since the second semi-ring 52 is not in direct contact with the pressure ring 4, the temperature of the second semi-ring 52 is relatively low. And the lower temperature can significantly improve the service life of the fire curtain 6.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A submerged arc furnace electrode sealing device, characterized in that, Comprising: A connecting piece, disposed on the electrode (2); At least one layer of fireproof curtain (6), the fireproof curtain (6) having a cylindrical structure, the fireproof curtain (6) being sleeved outside the electrode (2), and a first end of the fireproof curtain (6) being hermetically connected to the electrode (2) through the connecting piece, a second end of the fireproof curtain (6) being hermetically connected to the central furnace cover (1), a sealed cavity (8) being able to be formed among the connecting piece, the fireproof curtain (6), the central furnace cover (1) and the electrode (2), the sealed cavity (8) being isolated from the outside of the fireproof curtain (6), an outer contour of a vertical projection of the electrode hole (3) being located within an outer contour of a vertical projection of the fireproof curtain (6), a maximum length of the fireproof curtain (6) in the vertical direction being greater than a maximum distance in the vertical direction between the connecting piece and the central furnace cover (1), a first end of the fireproof curtain (6) being able to generate a relative displacement with respect to a second end of the fireproof curtain (6) along with the electrode (2), a direction of the relative displacement being parallel to an axial direction of the electrode (2); The connecting piece comprises: A pressure ring (4); A connecting tooling (5), the connecting tooling (5) being sleeved outside the pressure ring (4), and a first end of the fireproof curtain (6) being sleeved and fixed on the connecting tooling (5); The connecting tooling (5) comprises a pair of semi-circular rings, each of the semi-circular rings being provided with a connecting piece (54), the two semi-circular rings being able to be spliced into a circular ring through the connecting piece (54), the circular ring being adapted to the pressure ring (4); an inner surface of a first end of the fireproof curtain (6) abuts against an outer surface of the circular ring through a steel tie (7); The semi-circular ring comprises a first semi-circular ring (51) and a second semi-circular ring (52) sequentially arranged from top to bottom, the first semi-circular ring (51) and the second semi-circular ring (52) having the same wall thickness, and an inner diameter of the first semi-circular ring (51) being smaller than an inner diameter of the second semi-circular ring (52); wherein, the first semi-circular ring (51) is used for connecting with the pressure ring (4), and the second semi-circular ring (52) is used for connecting with the fireproof curtain (6); An inner diameter of the fireproof curtain (6) increases from top to bottom.

2. The submerged arc furnace electrode sealing device according to claim 1, characterized in that, The fireproof curtain (6) is a curtain made of silica gel material.

3. The submerged arc furnace electrode sealing device according to claim 2, wherein The curtain has a high-temperature resistance temperature of not less than 1200 °C, and a wall thickness of the curtain is greater than or equal to 16 mm and less than or equal to 24 mm.

4. The submerged arc furnace electrode sealing device according to claim 1, characterized in that, An anti-disengagement structure is further arranged between the circular ring and the fireproof curtain (6), and the anti-disengagement structure is used for preventing the fireproof curtain (6) from disengaging from the circular ring.

5. The submerged arc furnace electrode sealing device according to claim 4, wherein, The anti-disengagement structure comprises: an annular protrusion (53) disposed at a bottom edge of the circular ring and protruding radially outwards from an outer surface of the circular ring, and / or at least one anti-slip groove (55) opened on the outer surface of the circular ring around an axis line of the circular ring.

6. The submerged arc furnace electrode sealing device according to claim 4, characterized in that, The anti-disengagement structure comprises: A plurality of hooks, the plurality of hooks being arranged on the outer surface of the circular ring around a circumference of the circular ring; Hanging rings corresponding to the plurality of hooks one by one, the plurality of hanging rings being arranged at a first end of the fireproof curtain (6), and the corresponding hanging rings and the hooks being adapted to each other.

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