KR20200043016A - Apparatus for determining cause of soderberg electorde breakage in submerged arc furnace determining method of the same - Google Patents

Abstract

The present invention relates to a method and an apparatus for analyzing cause of breakage of a Soderberg electrode used in a Submerged Arc Furnace. In the method for analyzing the cause of the breakage of the Soderberg electrode according to one embodiment of the present invention, when the breakage of the Soderberg electrode generates, the cause of the breakage may be determined from the shape of the broken surface of the broken electrode.

Description

Method and apparatus for analyzing the cause of damage of the Sotherberg electrode {APPARATUS FOR DETERMINING CAUSE OF SODERBERG ELECTORDE BREAKAGE IN SUBMERGED ARC FURNACE DETERMINING METHOD OF THE SAME}

The present invention relates to an apparatus and method for analyzing the cause of breakage of a Soderberg electrode used in a submerged arc.

In the Soderberg type electrode used in the submerged arc, a solid carbon paste filled inside the metal casing is self-fired to form an electrode. During operation, the carbon paste is supplied with heat through a heater, softened at approximately 50-90 ° C, melted at 100-450 ° C, and then fired at 450-500 ° C.

At this time, as the calcined electrode gradually decreases to the lower portion of the SAF, the temperature rises, and the temperature at the tip point is overheated to approximately 2500 ° C or more, causing arcing. Since the electrode is continuously consumed during operation and descends, when a certain level is reached, the casing welding and carbon paste filling work must be performed on the upper part of the submerged arc. If the paste is lowered to the bottom of the electrode in a state where the firing is not sufficiently performed, an operation accident may occur in which the paste in the molten state leaves the electrode case.

For this reason, it is very important to form the carbon paste inside the electrode casing during operation. The paste may have a property in which the state of the paste can be changed by softening, melting, and firing according to different temperature ranges.

After all, what is important in the SAF (Submerged Arc Furnace) can be said to be the supply and control of anthracite, a carbon material that can play a role in generating arcs at high temperatures. Anthracite is a material with weak tensile strength and high compressive strength due to its characteristics. To reinforce the insufficient tensile strength, a coal tar pitch is used as a binder for the electrodes used in the SAF.

As described above, when an anthracite coal and coal tar pitch binder are mixed and heated for an appropriate period of time, it can be used as a self-forming electrode (soderberg electrode), but the distribution state of the binder is not good or an external mechanical shock or thermal shock is applied. In this case, there was a problem in that an electrode could be damaged in various ways.

1 is a view schematically showing a bonding state of a conventional prebaked electrode (prebaked electrode).

Referring to FIG. 1, in the case of the existing pre-baked electrode 100, the electrode made by firing graphite is a cylindrical shape, and an electrode assembly mechanism 110 having an embossed thread finished in a rhombic shape is formed at the bottom. It was used in such a way that the electrode 120 made by calcining graphite with intaglio thread was fitted and electricity was supplied through the contact clamp 130, which is an electric supply line.

In the case of the pre-baked electric rod 100, there was an advantage in that it is easy to extend the fastening by rotating the electrode by a length desired by the user.

In general, Pre Baked Elecrode is used in LF (Ladle Furnace) or EAF (Electric Arc Furnace). In the case of such LF or EAF, it has the advantage of easy normalization in the event of a loss. Specifically, it can have the advantage that it takes up to 1 hour.

However, such an LF or EAF electrode has a fatal disadvantage that cannot be applied to a large SAF. On the other hand, in the case of the Soderberg electrode, it can be said that the electrode is applied when it is impossible to transfer or assemble the electrode in a completed state by firing in advance because the size of the electrode is large.

Where such a self-forming electrode (soderberg electrode) is utilized is used in the manufacture of alloy irons such as Fe-Si (Ferro Silicon), Fe-Mn (Ferro-Manganese), and Fe-Ni (Ferro-Nickel).

SAF is a SAF suitable for large SAFs that operate 24 hours a day, like a blast furnace. In order to stably supply large-capacity electric power, a very large electrode having an average diameter of = 1,400mm and a length of ≥3,000mm should be used.

SAF is used as an electrode by firing the paste during operation, and is applied when the electrode is completed and transferred in advance or assembly is impossible. There is an advantage that can supply a large current regardless of the electrode scale. However, when an electrode breakage occurs, as a countermeasure against this, the point where the electrode breakage occurred, and the formation of a new electrode and work must be performed, so the occurrence of the breakage and the cause of the breakdown must be identified. It often took a long time to grasp the cause of the loss, and it was not possible to clearly find the cause to respond to it, leading to large accidents such as the occurrence of secondary loss.

Republic of Korea Patent Publication No. 10-1999-0076813 (released on October 15, 1999) (manufacture charter method) Republic of Korea Patent Publication No. 10-2018-0012005 (published Feb. 05, 2018) (How to recover organic metals from stainless steel converter slag using molten reduction SAF)

The present invention has been devised to solve the above problems, and is a three-phase electrode composed of three electrodes (R, S, T) to check the abnormality of the electrode by a method of current monitoring (current monitering), When an abnormal situation occurs (here, an abnormal situation refers to a case where it is determined that the electrode has been damaged when the current continues to operate while maintaining a constant value and the current shows a maximum value and does not fall.) During the operation Half of the broken electrodes are embedded in the raw material side, and half are held up by the contact clamp. At this time, the cut electrode embedded in the raw material surface will be referred to as a cut electrode part 260. By contacting the analysis device 300, which is a tool for analyzing the cause of the damage of the electrode, the fluctuation member 310 included in the analysis device 300 is brought into contact with the high-temperature descending broken electrode part 260 that is separated from the raw material surface. It is divided into 1 over baking, 2 under baking, 3 mechanical shock, and 4 thermal shock according to the four situations to be described later. By doing so, it is to provide a method for analyzing the cause of the breakage of the Sotheberg electrode used in SAF, which can immediately identify the cause of the electrode breakage and can quickly cope with normalization of operation.

In addition, according to another embodiment of the present invention, according to the shape of the fluctuation member 310 is formed by supplying a breakage cause analysis device to the Soderberg Arc Furnace (SAF) 1 overbaking 2 underbaking 3 mechanical impact (mechanical shock) 4 Provides a device for analyzing the cause of the breakdown of the Sotheberg electrode used in SAF, which is capable of rapid cause identification and resumption of operations by taking corresponding measures according to the cause of the breakdown classified as thermal shock. have.

In addition, according to another embodiment of the present invention, in the method of operating a submerged arc furnace that performs a melting process using a Soderberg electrode, it is conventionally required to take at least 5 days to estimate the cause of electrode damage, or to quickly remove the cause of the damage. Since it was impossible to affect the other electrode, there was a problem that chain loss occurred and caused a huge loss.However, for this problem, a method of determining the situation of a rapid electrode breakage using an electrical indicator (a change in power factor) and responding accordingly It is an object of the present invention to provide a method for operating a submerged arc furnace that performs a melting process using a Soderberg electrode capable of maximizing efficiency in SAF that can maximize operating efficiency by taking.

On the other hand, other objects not specified in the present invention will be additionally considered within a scope that can be easily inferred from the following detailed description and its effects.

According to an embodiment of the present invention for achieving the above object, in the method of analyzing the cause of the breakage of the Soderberg electrode, when the breakage of the Soderberg electrode occurs, analyzing the cause of the breakage from the shape of the cut surface of the broken electrode It can be characterized as.

In addition, the cause of the breakage may be analyzed as one of overbaking, underbaking, mechanical shock, and thermal shock according to the shape of the cut surface.

In addition, it may be to determine the cause of the breakage according to whether the cut surface is a convex upward shape, a concave downward shape, a diagonal shape, or a flat shape in the longitudinal direction of the electrode.

In the apparatus for analyzing the cause of the breakage of the Sotheberg electrode according to an embodiment of the present invention, the fluctuation member includes a plurality of fluctuating members whose length or position is changed by contacting the cut surface of the Soderberg electrode and the fluctuating member is the fracture surface It may be characterized by analyzing the cause of the damage from the change in length or position of the variable member in contact with the shape of the broken surface in contact with.

Also, the variable member may be a combustion member or a non-combustion member.

In addition, when the variable member is a combustion member, the length of the variable member changes due to combustion upon contact with the broken surface, and when the variable member is a non-combusted member, the position of the variable member is moved by contact with the broken surface It may be characterized by changing.

In a method of operating a submerged arc furnace that performs a melting process using a Soderberg electrode according to an embodiment of the present invention, when a fracture of the Soderberg electrode occurs, checking the shape of the broken surface of the broken electrode (s110) ), The step of analyzing the cause of the breakage from the identified cut-off surface shape (s120) and taking a step corresponding to the cause of the breakage (s130).

In addition, in the step (s120) of analyzing the cause of the breakage, the cause of the breakage is analyzed from the change in the length or position of the changeable member according to the shape of the cutout surface by contacting the changeable member whose length or position changes with the cutoff surface of the electrode. It can be characterized by.

In addition, the step (S130) of taking an action corresponding to the cause of the breakage may be characterized by changing the operation method of the Soderberg electrode according to the cause of the breakage.

In addition, when the cause of the damage of the Sotheberg electrode is overbaking, it may be characterized in that the descending speed of the Soderberg electrode descending by gravity is increased.

In addition, when the cause of the damage of the Sotheberg electrode is underbaking, it may be characterized in that the descending speed of the Soderberg electrode descending due to gravity is slowed down.

In addition, when the cause of the damage of the Sotherberg electrode is a mechanical shock, it may be characterized in that the vibration of the equipment contacting the Soderberg electrode is removed.

In addition, when the cause of the damage of the Sotherberg electrode is thermal shock, it may be characterized in that the current supplied to the plurality of Soderberg electrodes is controlled to be equal.

According to the analysis method of the cause of the breakage of the Sotherberg electrode according to an embodiment of the present invention, the types of electrode breakage are largely classified into four types, and the descending speed of the Soderberg electrode descended by the gravity of the Soderberg electrode in response to these four causes Check whether micro-vibration has occurred in the equipment coupled to the Soderberg electrode when controlling or ascending or descending of the Soderberg electrode, or check whether the current supplied to each phase (R phase, S phase, T phase) is uniformly supplied. Therefore, it is possible to minimize the damage caused by frequent electrode breakage because it is possible to respond to electrode breakage by controlling the current.

As an example, when the method for analyzing the cause of the breakage of the Soderberg electrode of the present invention was applied to the SAF containing the Soderberg electrode, the electrode breakage of 13 cases / year was reduced to 2 cases / year, so that a rapid loss issue could be resolved. In addition, it has the advantage of maximizing the operation efficiency in the SAF including the Soderberg electrode by preventing the secondary cut, which can be regarded as a major accident, in advance.

The above-described effects of the present invention according to the technical spirit of the present invention have been described by way of example, and the scope of the present invention is not limited by these effects.

1 is a view schematically showing a bonding state of a conventional prebaked electrode (prebaked electrode).
2 is a view showing a coupled state of the Soderberg electrode according to an embodiment of the present invention.
FIG. 3 (a) is a plan view of the Soderberg electrode viewed from above, and FIG. 3 (b) is a photograph showing a window formed in a pin.
Figure 4 is a graph of the power factor over time that can monitor the occurrence of a broken situation of the Soderberg electrode according to an embodiment of the present invention.
FIG. 5 is a view showing the cause of the damage of the Soderberg electrode according to an embodiment of the present invention in four different ways.
FIG. 6 is a photograph showing that over baking occurs in a Soderberg electrode used in SAF according to an embodiment of the present invention, thereby causing electrode breakage.
FIG. 7 is a picture and a diagram of a case where the Soderberg electrode used in SAF according to an embodiment of the present invention is cut by overbaking.
FIG. 8 is a picture and a diagram of a case where a Soderberg electrode used in SAF according to an embodiment of the present invention is cut by underbaking.
FIG. 9 is a picture and a diagram of a case in which the Soderberg electrode used in SAF according to an embodiment of the present invention is damaged by a mechanical shock.
FIG. 10 is a photograph and a view showing a case where a Soderberg electrode used in SAF according to an embodiment of the present invention is damaged by thermal shock.
11 is a view showing a temperature distribution of a Soderberg electrode used in SAF according to an embodiment of the present invention.
12 is a view showing the configuration of an analysis device for analyzing the broken state of the Soderberg electrode used in SAF according to an embodiment of the present invention.
13 is a view showing an operating state of the analysis device for measuring the cut shape of the Soderberg electrode used in SAF according to an embodiment of the present invention.
14 is a view showing the configuration of an analysis device for measuring the cut-off shape of a Soderberg electrode used in SAF according to another embodiment of the present invention
15 is a process diagram showing a method of operation in a submerged arc furnace performing a melting process using a Soderberg electrode according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail. The following examples and drawings are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. In addition, unless otherwise defined in the technical terms and scientific terms used in the present invention, those skilled in the art to which this invention belongs have the meanings commonly understood, and the present invention in the following description and accompanying drawings Descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter are omitted.

The cause of the breakage of the Sotheberg electrode 200, which can reduce the time of operation normalization by identifying the cause according to the damage phenomenon of the Sotheberg electrode 200 that may occur in the SAF according to an embodiment of the present invention and taking corresponding measures Let's look at the analysis device.

2 is a view showing a coupled state of the Soderberg electrode according to an embodiment of the present invention.

Referring to FIG. 2, in the case of the Soderberg electrode 200, the inlet 210 to which the Soderberg paste is supplied and the Soderberg paste supplied from the Inlet are slightly lowered from the intermediate stand 220 and the intermediate stand, which fall downward by their own weight. It may include a softening zone 230 formed at the down point.

The softening table 230 is surrounded by a casing 202 made of steel, including fins 205, and the fins 205 are formed in a symmetrical shape on the inner wall of the casing 202. It may be a shape protruding toward the center.

A solid electrode 240 may be formed below the softening table 230.

The solid electrode 240 may be a material in which an anthracite is fired through a predetermined temperature. As described above, anthracite is weak in tensile strength due to its characteristics, but it can be said to be a material having excellent compressive strength, so a binder may be needed to be used in materials such as electrodes having good hardness.

In the case of the Sodberg electrode 200 used for SAF according to an embodiment of the present invention, the solid electrode 240 constituting the lower layer of the Sodberg electrode 200 supports the Sodberg paste flowing through the inlet 210 can do.

In addition, the contact clamp 130 serves to hold the casing 202 surrounding the outer circumferential surface of the solid electrode 240 to prevent the solid electrode 240 from being separated from the casing 202.

 A solid solid material is disposed on the lower portion of the casing 202 and must hold the casing 202 to prevent the loss of the sodberg paste and serve as the sodberg electrode 200.

FIG. 3 (a) is a plan view of the Soderberg electrode viewed from above, and FIG. 3 (b) is a photograph showing a window formed in a pin.

Referring to FIG. 3 (b), the casing 202 of the Soderberg electrode 200 is formed in a central portion, and fins 205 are symmetrical to the inner wall of the casing 202. You can see that it is a protruding shape. The fin 205 may include a window 208 penetrating the fin 205.

Here, the casing 202 may prevent the sodaberg paste from spreading when the sodaberg paste is loaded. In addition, since the material is formed of an iron material, it is configured to receive electricity through the conductor 241 from the contact clamp 231 surrounding the outer circumferential surface.

Anthracite, which is graphite constituting the Soderberg paste, may be electrodeized by transmitting electrical energy through the contact clamp 231. In addition, the area around the casing 202 held by the contact clamp 231 is a portion in which the liquid Soderberg paste is heated by electricity and is called a softening zone 230.

When such a softening table 230 is lowered to the bottom of the contact clamp 130, the number of anthracite coals that can be hung on the window 208 pierced by the pin 205 in the casing 202 serving as a solidified lower stopper Can decrease. This phenomenon causes the solid-state electrode 240 to fall out, and the lower portion of the casing 202 is changed to an open state. Due to this phenomenon, the sodaberg paste in a liquid state may fall out of the casing and result in loss.

The soderberg electrode 200 is also referred to as a self-firing electrode, and is an electrode capable of performing melting operations by annealing the anthracite coal contained in the soderberg paste as an electrode.

If the Soderberg electrode 200 is damaged, careful management is required because it takes a lot of time to normalize the melting operation. If the Sotheberg electrode 200 is damaged during the melting operation, it is important to eliminate the cause quickly so as not to affect other Soderberg electrodes 200 connected to the SAF.

To this end, first, an analysis of the broken state of the Soderberg electrode 200 must be performed.

Typically, in the SAF for performing the melting process as in the present invention, the determination of the steady state of the Soderberg electrode 200 may be made through a monitoring process for current.

In the case of the SAF including the Soderberg electrode 200, a 24-hour operation is performed. In the case of such a SAF (Submerged Arc Furnace), the electrode is buried on the raw material surface, so there is a disadvantage that it is not possible to check the location of the cutoff of the Soderberg electrode 200.

In the case of the Soderberg electrode 200, since it is impossible to determine the location of the Soderberg electrode's breakage, electric indicators are used as a method of current monitoring as follows, as it is impossible to confirm whether the Soderberg electrode 200 has actually been damaged.

Figure 4 is a graph of the power factor over time to monitor the occurrence of the breakage of the Sotheberg electrode according to an embodiment of the present invention.

Referring to FIG. 4, when no damage to the Soderberg electrode occurs during normal operation, the ratio of active power in the total amount of received electricity is kept constant. However, when the damage of the Soderberg electrode 200 occurs, an effect of shortening the electrode is obtained, and as illustrated in FIG. 4, a power factor that is a ratio of active power / apparent power increases.

When the damage of the Soderberg electrode 200 occurs in this way, the Soderberg electrode 200 is shortened, so that the Soderberg electrode 200 is farther from the raw material surface than the previously operated Soderberg electrode 200 and the amount of active power This increases the phenomenon.

This may be because the resistance value generated in the situation where the raw material is buried decreases.

When the phenomenon as shown in FIG. 4 appears during operation for each Soderberg electrode 200, the input of power is temporarily stopped, and the Soderberg electrode 200 is raised as much as possible.

Subsequently, a check operation for the broken electrode unit 260 (first embodiment) or a process of checking the cause of the broken through the broken electrode unit 260 through the analysis device 300 (second embodiment, third embodiment) This can proceed.

The apparatus for analyzing the cause of the damage to the sordberg electrode may include a plurality of variable members 310 that change in length or position in contact with the broken surface of the broken electrode.

The cause of the breakage can be analyzed from the change in length in the case of the combustion member of the variable member 310 and in the position in the case of the non-combustion member. Hereinafter, it will be described in detail according to each embodiment.

 (First Example)

FIG. 5 is a view showing the cause of the damage of the Soderberg electrode according to an embodiment of the present invention in four different ways.

In the present invention, a method of dividing and suggesting the cause of the electrode breakdown into four types is used.

When the Soderberg electrode 200 is broken, it can be divided into four types, and each of the four types has individual characteristics.

Referring to FIG. 5 (a), it can be said that the crack starts from the central region and extends to the periphery by overbaking, and the shape of the cut surface of the cut electrode portion 260 has a convex upward shape. . Referring to FIG. 5 (b), cracks are formed from the outer periphery of the Soderberg electrode 200 and spread to the center by underbaking. The cut electrode part 260 may have a concave shape with a center downward.

5 (c), it can be seen that the mechanical shock was applied to the Soderberg electrode 200, and the cut electrode part 260 was formed in a diagonal direction.

5 (d), it can be said that the thermal shock (thermal shock) is applied to the Soderberg electrode 200, so that the cut electrode part 260 has a flat cross section.

In the first embodiment of the present invention, it is possible to determine the cause of the damage of the Sotheberg electrode 200 from the broken shape of the broken electrode part 260.

However, this method has a disadvantage in that the flame must disappear after the flame disappears from the cut-off electrode unit 260 for accurate observation, and visual observation may be difficult.

Looking at the characteristics of each cut for the cutting of each Soderberg electrode 200 is as follows.

FIG. 6 is a photograph showing that over baking occurs in a Soderberg electrode used in SAF according to an embodiment of the present invention, thereby causing electrode breakage.

Referring to FIG. 6, when overbaking baking a sodaberg paste made of anthracite and coal tar pitehc with electrical energy, the sodaberg paste is liquefied at a temperature of 82-420 ° C.

When the sodaberg paste is liquefied, the activity of the anthracite coal and coultar pitch becomes smooth, and the anthracite coal may move to the center of the casing 202 forming a cylindrical shape, and the binder may move toward the outer portion of the casing 202.

In this process, as the coal tar pitch, which is a binder, penetrates between the anthracite particles, a process in which solid anthracite coal is sintered with the aid of a liquid binder may proceed.

However, if the baking time becomes longer, the coultar pitch located between the anthracite coals does not settle and phase separation with the anthracite occurs due to the specific gravity difference. A malformed electrode can be made.

FIG. 6 is a photograph showing that over baking occurs in a Soderberg electrode used in SAF according to an embodiment of the present invention, thereby causing electrode breakage.

 Referring to FIG. 6, the center portion is in a calcined state, but the crack is extended to an area in which there are many carbonized coultar pitches surrounding the center portion.

This process leads to brittle fracture rather than ductile fracture due to the nature of the ceramic.

FIG. 7 is a picture and a diagram of a case where the Soderberg electrode used in SAF according to an embodiment of the present invention is cut by overbaking.

Referring to FIG. 7, as the development of cracks (movement of dislocation) occurs from the center of the Soderberg electrode 200 toward the outer circumferential surface, the shape of the broken portion has a convex shape upward.

In the apparatus for analyzing the cause of the breakage of the Soderberg electrode 200 used in the SAF according to an embodiment of the present invention, in this case, the time during which the contact clamp 130 holds the casing 202 lasts too long for anthracite and coultar pitch It is analyzed that separation occurred.

In this case, as a solution, a sodaberg paste is present in the softening zone 230 among the sodaberg electrodes in a liquid state existing inside the casing 202 through a method of reducing the holding time of the contact clamp 130 holding the casing 202. Use a method that reduces the amount of time you spend.

FIG. 8 is a picture and a diagram of a case where a Soderberg electrode used in SAF according to an embodiment of the present invention is cut by underbaking.

Referring to FIG. 8, underbaking is performed when the sintering operation (baking) that has to occur between the anthracite and the coal tar pitch is performed for a short period of time, sufficiently sintering is performed at the center of the casing 202 and the remaining binder The firing should be performed in such a way that it spreads to the outside, and a sufficient binder is not supplied toward the outer periphery of the casing 202, and cracks (cracks) are generated from the outer side of the inner surface of the casing 202.

It is known that an anthracite, which is essentially ceramics, exhibits brittle fracture as the crack progresses when the stress at the crack tip exceeds a certain level.

As described above, when cracks are generated at the outer circumferential surface of the casing constituting the Soderberg electrode 200, the cracks progress toward the inner center, and the cracks appear as the cracks progress toward the inner center that has not yet been completely fired.

It can be seen that as the anthracite calcined in the cut portion on the upper side was formed in the form of an aggregate, a binder was not supplied between the aggregates of the anthracite, so that the damage occurred.

In order to reduce such underbaking, the sodaberg paste, which is liquid, can be solved by delaying the time spent down the softening zone 230.

In addition, although it is an additional case, a breakage of the Sotheberg electrode 200 may occur due to mechanical shock and thermal shock.

FIG. 9 is a picture and a diagram of a case in which the Soderberg electrode used in SAF according to an embodiment of the present invention is damaged by a mechanical shock.

Referring to FIG. 9, in the case of mechanical impact, it can be confirmed that the cut surface was formed in a diagonal direction.

This is a phenomenon that may occur when the center is shaken by external vibration or the like when the sodberg paste descends due to the opening action of the contact clamp 130 of the sodberg electrode 200.

In order to remove this, it may be possible to solve the problem by checking the vibration state of the SAF located at the periphery of the Soderberg electrode 200 and balancing it.

As another cause of the loss, it can be said that the electricity supplied through the Soderberg electrode 200 is not evenly distributed.

In this case, in one embodiment of the present invention, it is called a thermal shock.

FIG. 10 is a photograph and a view showing a case where a Sotheberg electrode used in SAF according to an embodiment of the present invention is damaged by thermal shock.

Referring to FIG. 10, it can be seen that the cut surface forms a flat state.

The damage of the Sotheberg electrode 200 due to thermal shock has a characteristic that is generated in an instant as electricity is not evenly supplied. If the three-phase alternating current is not supplied to the Soderberg electrode 200 due to an unexpected power failure or the like, and the current is not evenly supplied due to a partial failure, the Soderberg electrode 200 contracts, and the electrode that forms the highest temperature It acts in the upper direction of the Soderberg electrode 200 forming a low temperature state from the tip 250.

When a thermal shock is generated as described above, it is necessary to check whether the current is uniformly supplied to each electrode through an ammeter or the like, and through this process, the problem of the Sotheberg electrode 200 can be solved.

11 is a view showing a temperature distribution of a Soderberg electrode used in SAF according to an embodiment of the present invention.

Referring to FIG. 11, the inlet 210 may be an area in which 20 to 30 ° C. is maintained as an area in which the Soderberg paste is introduced.

The intermediate zone 220 is an area where the volatile matter, which is a binder, starts to decrease, and can be said to be a point where shrinkage of the Soderberg paste occurs.

The softening table 230 is a portion that receives electricity from the contact clamp 231 and may be an area in which the Soderberg paste forms a liquid phase.

At this time, the expansion of soderberg paste may occur.

The region of the solid electrode 240 may be said to be a region where sintering starts and is completed, and may serve to supply electric current to a region capable of generating an arc by supporting the liquid soderberg paste and receiving electric current from the conducting wire 241. have.

The electrode tip 250 is a part in which the upper Soderberg paste is sintered and the current is concentrated, and as shown in FIG. 11, the temperature gradient of the Soderberg electrode used in the SAF according to an embodiment of the present invention increases as the downward direction increases. It can be a key area that can perform a melting action by arcing while forming a direction.

In fact, it is known that the temperature of the electrode tip 250 rises to about 2500 ° C. and a composition and a configuration capable of maintaining the temperature of 2500 ° C. are required to perform arcing smoothly.

(Second example)

Hereinafter, a method of using an analysis apparatus as a method for evaluating the broken state of the Soderberg electrode that may occur during the process of sintering the Soderberg paste will be described in detail.

The analysis device may include a support 330, a fixing mechanism 320 and a variable member 310.

12 is a view showing the configuration of an analysis device for analyzing the broken state of the Soderberg electrode used in SAF according to an embodiment of the present invention.

The analysis device 300 may include four fluctuating members 310 mainly composed of wood in order to grasp the state of electrode breakage when the Sotheberg electrode 200 is damaged.

When the variable member 310 contacts the broken electrode part 260, a combustion process may proceed. Therefore, a difference may occur in the shape in which the fluctuation member 310 is burned according to the shape of the cut electrode portion 260.

From this, combustion of the fluctuation member 310 depends on whether the cut-off surface shape of the cut-off electrode part 260 has a convex upward shape, a concave downward shape, a diagonal shape, or a flat shape. The process may appear in different ways.

Unlike the first embodiment, a process of checking through an indirect combustion process may be performed. It is as described above with regard to the direction in which the operation process is performed thereafter.

When the variable member 310 is a combustion member, a phenomenon in which combustion occurs upon contact with the cut surface may occur, and a phenomenon in which the length of the variable member 310 changes.

As illustrated in FIG. 12, the four variable members 310 constituting the analysis device 300 may be supported by the support 330 through the fixing mechanism 320.

In FIG. 12, the number and shape of the variable members are limited to four variable members, but the detailed description thereof will be omitted as it is obvious to those skilled in the art.

The moving member 310 moves the analysis device 300 hanging on the support 330 through the fixing mechanism 320 onto the broken electrode part 260, which is a broken electrode, and the four moving members 310 ), It is possible to check the broken state of the Sotheberg electrode 200 in a shape generated by burning.

13 is a view showing an operating state of the analysis device for measuring the cut shape of the Soderberg electrode used in SAF according to an embodiment of the present invention

Referring to FIG. 13, it can be seen that the cut electrode portion 260 on which the raw material surface is placed is separated.

As described above, since the hard breakage of the broken electrode part 260 can be easily grasped by monitoring the current supplied in three phases, the broken electrode part 260 of the Sotheberg electrode 200 immediately separated from the raw material surface ) May be searched.

Through this process, the broken electrode part 260 is not yet completely cooled, so it is possible to analyze the broken surface of the Soderberg electrode 200 through the fluctuating member 310 mounted on the analysis device 300. You can.

The variable member 310 may be a combustion member such as wood in the second embodiment of the present invention. When the combustion member is exposed to a high temperature environment as in Example 2 of the present invention, the shape may change through the combustion action.

From this, as shown in FIG. 13, if an analysis process for a cut surface is performed for each of the four types, normalization of the melting operation can be promoted through the above-described adjustment operation.

(Example 3)

Even in the third embodiment, the method for analyzing the broken state of the Sodberg electrode that may occur in the process of sintering the Sodberg paste is not terminated by a single use of the analysis device 300, but a reusable floating member 310A ) Can be used non-combustion member.

Here, the non-combustion member is formed of a material such as steel, and the combustion action does not occur upon contact with the broken electrode part 260, but the shape remains the same due to the pressure action, but the position may change due to the pushing operation. Can occur.

14 is a view showing the configuration of an analysis device for measuring the cut-off shape of a Soderberg electrode used in SAF according to another embodiment of the present invention.

Referring to FIG. 14, the variable member 310A may be a non-combustion member such as steel in the third embodiment of the present invention. When the non-combustion member is exposed to a high temperature environment, a shape may be maintained while pressure may be applied according to the shape of the cut-off electrode unit 260 to move the upper and lower portions while maintaining the same shape.

In FIG. 14, the variable member 310A may include a hook member 312 formed in a hook shape and a locking member 314 through which the hook member 312 can be caught.

The non-combustion member 310 may have an effect that the hook member 312 formed in a hook shape is raised according to the shape of the cut-off electrode unit 260. When the ring member 312 is raised, it is configured to be caught by the engaging member 314 formed in a wedge shape.

The ring member 312 and the locking member 314 are both formed of a steel material, so that melting or burning does not occur even when charged in the submerged arc furnace when the melting operation is performed.

As such a simple configuration, in the case of the variable member 310A according to the third embodiment of the present invention, it is possible to analyze the shape of the cut surface of the broken electrode part 260 from the shape in which the four variable members 310A are hung. You can.

Hereinafter, a method of operating a submerged arc furnace performing a melting process using a Soderberg electrode according to an embodiment of the present invention will be described.

15 is a process diagram showing a method of operation in a submerged arc furnace performing a melting process using a Soderberg electrode according to an embodiment of the present invention.

Referring to FIG. 15, when the sordberg electrode 200 is damaged, the shape of the broken surface of the broken electrode (the broken electrode unit 260) may be checked (S110).

It is the same as described above that the cut surface shape appears in different shapes depending on the cause of the cut, depending on the overbaking, underbaking, mechanical shock, and thermal shock.

Analysis of the cause of the breakage may be performed according to the second or third embodiment from the identified cut face shape (s120). That is, in the second embodiment, the cause of the breakage can be analyzed from the shape of the variable member 310 whose length is changed.

In the case of a non-combustion member whose position is changed, as illustrated in FIG. 14, the ring member 312 may be raised according to the shape of the cut-off electrode unit 260 to be caught by the locking member 314, and the four floating members ( 310A).

As described above, if the determination is made according to the shape of the cut surface of the cut electrode part 260, an action corresponding to the cut cause may be taken (s130).

That is, when the cause of the breakage is overbaking, it is possible to take measures to speed up the descending speed of the Soderberg electrode 200 descending due to gravity.

When the cause of the breakage is under-baking, the operation of normalizing the operation may be performed through a method of slowing the descending speed of the mall Soderberg electrode descending by gravity.

When the cause of the breakage is a mechanical shock, the operation can be normalized by removing vibrations of equipment contacting the Sotheberg electrode 200.

When the cause of the breakage is a thermal shock, the operation may be normalized by a method of controlling so that currents supplied to the plurality of Soderberg electrodes 200 are equalized.

As described above, in the present invention, it has been described by specific matters and limited embodiments and drawings, which are provided to help a more comprehensive understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention Various modifications and variations are possible from those skilled in the art to those skilled in the art.

Therefore, the spirit of the present invention is limited to the described embodiments, and should not be determined, and all claims that are equivalent to or equivalent to the claims, as well as the claims described below, will belong to the scope of the spirit of the present invention. .

100: pre-baked electric rod 110: electrode assembly mechanism
120: electrode 231: contact clamp
241: conductor 200: Soderberg electrode
202: casing 205: fin
210: inlet 220: intermediate
230: softening zone 240: solid electrode
250: electrode tip 208: window

Claims (13)

In the event of a breakdown of the Soderberg electrode,
A method for analyzing the cause of the breakage of the Soderberg electrode, characterized in that the cause of the breakage is determined from the shape of the cut surface of the broken electrode. According to claim 1,
A method of analyzing the cause of the breakage of the Sotheberg electrode, characterized in that the cause of the breakage is analyzed as one of over-baking, under-baking, mechanical shock, and thermal shock according to the shape of the cut-off surface. According to claim 2,
A method for analyzing the cause of the breakage of the Soderberg electrode, characterized in that the breakage is analyzed according to whether the cut-off surface is convex upward, concave downward, diagonal or flat in the longitudinal direction of the electrode. It includes a plurality of fluctuating members whose length or position changes in contact with the cut surface of the cut Soderberg electrode.
A device for analyzing the cause of damage of the Sotheberg electrode, wherein the cause of the breakage is analyzed from a change in the length or position of the variable member according to the shape of the broken surface when the variable member contacts the broken surface. According to claim 4,
The fluctuation member is a combustion member or a non-combustion member, characterized in that the device for the analysis of the cause of damage of the Soderberg electrode. The method of claim 5,
When the variable member is a combustion member, the length of the variable member changes due to combustion upon contact with the cut surface
If the variable member is a non-combustion member, the cause of the breakage of the Sotherberg electrode is characterized in that the position of the variable member changes by moving upon contact with the broken surface. In the operation method of the submerged arc furnace performing a melting process using a Soderberg electrode,
Checking a cut surface shape of the cut electrode when the cut of the Soderberg electrode occurs;
Analyzing the cause of the breakage from the identified cut face shape; And
The step of taking measures corresponding to the cause of the loss; submerged arc furnace operating method comprising a. The method of claim 7,
Analyzing the cause of the loss is
A method of operating a submerged arc furnace, characterized by analyzing a cause of damage from a change in the length or position of the variable member according to the shape of the cut surface by contacting the variable member whose length or position changes with the cut surface of the electrode. The method of claim 8,
Taking steps corresponding to the cause of the loss is
A method of operating a submerged arc furnace, wherein the operation method of the Soderberg electrode is changed according to the cause of the breakage. The method of claim 9,
A method of operating a submerged arc furnace, characterized in that, when the cause of the sodalberg electrode is overbaked, the descending speed of the soderberg electrode descending by gravity is increased. The method of claim 9,
A method of operating a submerged arc furnace, characterized in that when the cause of the sordberg electrode is under-baking, the descending speed of the sodberg electrode descending due to gravity is slowed down. The method of claim 9,
A method for operating a submerged arc furnace, characterized in that vibration of a facility in contact with the Soderberg electrode is eliminated when the cause of the Sotheberg electrode breakage is a mechanical shock. The method of claim 9,
A method of operating a submerged arc furnace, wherein the current supplied to the plurality of Soderberg electrodes is controlled to be equal when the cause of the Sotheberg electrode is damaged is thermal shock.

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