CN108026597B - Vacuum tapping device and tapping control method - Google Patents
Vacuum tapping device and tapping control method Download PDFInfo
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- CN108026597B CN108026597B CN201680055741.7A CN201680055741A CN108026597B CN 108026597 B CN108026597 B CN 108026597B CN 201680055741 A CN201680055741 A CN 201680055741A CN 108026597 B CN108026597 B CN 108026597B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
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Abstract
A steel tapping apparatus using vacuum according to an embodiment of the present invention includes: a closed cavity which is sealed to form a molten steel outlet at the lower part of the side surface of the furnace body and can adjust the internal pressure; and a first steel-tapping hole formed to penetrate a lower portion of the closed-type cavity, to discharge the molten steel flowing in through the molten steel outflow port to the outside, and formed such that an upper portion protrudes from a lower portion of the furnace body by a predetermined height.
Description
Technical Field
The present invention relates to a molten steel processing apparatus of an inclined or non-inclined type.
Background
Generally, methods for discharging molten steel using an electric furnace apparatus include an Eccentric Bottom Tapping (EBT) method, a Spout (Spout) method, a Siphon (Siphon) method, and the like.
The EBT system has a problem that slag flows out during tapping because the furnace body needs to be excessively inclined in order to discharge molten steel in the furnace, and has a problem that it is difficult to remove slag contained in molten steel because all molten steel stored in the furnace body is discharged at once during tapping.
On the one hand, the siphon method is an effective means for discharging molten steel without discharging slag. However, the use of the siphon effect has a problem that it is not easy to achieve due to various constraints. That is, in order to utilize the siphon effect, a predetermined height needs to be maintained between the minimum height of molten steel and the minimum height of the tap hole, and airtightness (sealing) of the lower tapping (tapping) device needs to be maintained.
As a technique related to tapping, there is, for example, korean patent laid-open publication No. 2010-0078665 ("tapping apparatus and tapping method", published: 2010, 07/08).
Disclosure of Invention
According to an aspect of the present invention, there is provided a vacuum-based tapping apparatus and a tapping control method capable of performing tapping without tilting without using a siphon effect.
Further, according to another aspect of the present invention, there are provided a vacuum-based steel tapping apparatus and a steel tapping control method, which can prevent a vortex flow to stabilize steel tapping, effectively prevent slag from being mixed, and control the amount of steel tapped in a batch manner.
According to an embodiment of the present invention, a tapping apparatus using vacuum tapping according to the present invention includes: a closed cavity which is sealed to form a molten steel outlet at the lower part of the side surface of the furnace body and can adjust the internal pressure; and a first steel-tapping hole formed to penetrate a lower portion of the closed-type cavity to discharge the molten steel flowing in through the molten steel outflow port outward, and formed such that an upper portion protrudes from a lower portion of the furnace body by a predetermined height.
According to another aspect of the present invention, a method for controlling a tapping apparatus that taps steel in vacuum includes: a closed chamber which seals a molten steel outflow port formed at a lower portion of a side surface of the furnace body and can adjust an internal pressure by pressurization by injected gas and decompression by vacuum; and a first steel-tapping hole formed to penetrate a lower portion of the closed-type cavity, to discharge molten steel flowing in through the molten steel outflow port outwardly, and formed such that an upper portion thereof protrudes from a lower portion of the furnace body by a predetermined height, wherein the steel-tapping control method includes: a raw material charging step of charging raw materials into the furnace body; a melting and refining step of melting and refining the raw material in the furnace body into molten steel; and a tapping step of discharging the melted and refined molten steel through the first tap hole, wherein the tapping step includes the steps of: the height of the molten steel flowing into the inside of the closed cavity is made higher than the height of the protrusion of the first tap-hole by maintaining the inside of the closed cavity in a vacuum state.
According to an embodiment of the present invention, a closed cavity is formed in a lower portion of a side surface of the furnace body, and after a first tap hole having a predetermined height is formed in the closed cavity by penetrating the closed cavity and having an upper portion protruding from a lower portion of the furnace body, a pressure in the closed cavity is adjusted, so that tapping can be performed without tilting without using a siphon effect.
In addition, according to an embodiment of the present invention, the inside of the closed type cavity is maintained in a vacuum state during the steel discharge, and the height of the molten steel flowing in is made higher than the height of the first steel-outlet, so that the steel discharge can be stabilized.
In addition, according to another embodiment of the present invention, slag can be effectively prevented from being mixed by tapping at the lower portion of the furnace body, and the amount of tapped steel can be controlled in batches by adjusting the pressure inside the closed cavity.
Further, according to the steel discharge apparatus of the one aspect of the present invention, it is possible to apply the steel discharge apparatus to a tilting furnace body in addition to a non-tilting furnace body, and in the case of applying the steel discharge apparatus to a non-tilting furnace body, the tilting operation of the furnace body is omitted, and the power-on operation is realized during the steel discharge, so that the power-off time (power-off time) during the operation can be shortened, and the productivity of the electric furnace can be improved.
In addition, in the case of the conventional EBT steel tapping system, since the furnace body needs to be tilted, the position of the auxiliary devices such as the transformer and the dust collecting pipe (duct) is determined according to the position of the steel tapping hole. In addition, when the attachment of the electric furnace is provided, there is no disturbance due to the inclination of the furnace body, and thus there is an advantage that the arrangement can be performed in a fluid manner.
Drawings
Fig. 1 is a plan view of a tapping device applied to a furnace body according to an embodiment of the present invention.
3 FIG. 32 3 is 3 a 3 side 3 view 3 of 3 FIG. 31 3 taken 3 along 3 line 3 A 3- 3 A 3' 3. 3
Fig. 3 is a schematic view illustrating a pressing step of the tapping device according to an embodiment of the present invention.
Fig. 4 and 5 are schematic views illustrating a tapping step of the tapping apparatus according to an embodiment of the present invention.
FIG. 6 is a side view of FIG. 1 taken along line B-B'.
Fig. 7 is a schematic view of a plurality of closed chambers provided in a furnace body according to an embodiment of the present invention.
Fig. 8 is a flowchart for explaining a tapping control method according to an embodiment of the present invention.
Fig. 9a is a top view of a tapping device applied to a furnace body according to an embodiment of the present invention.
FIG. 9b is a side view of FIG. 9a taken along line C-C'.
Fig. 10 is a schematic view of an electric furnace to which a tapping device according to an embodiment of the present invention is applied.
Fig. 11 is a schematic view of a converter to which a tapping device according to an embodiment of the present invention is applied.
Fig. 12 is a schematic view of a nonferrous metal electric furnace to which a tapping apparatus according to an embodiment of the present invention is applied.
Fig. 13 is a schematic view of a tundish to which a tapping device according to an embodiment of the present invention is applied.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment of the present invention may be modified into various forms, and the scope of the present invention is not limited to only the embodiments described below. In the drawings, the shapes, sizes, and the like of elements may be exaggerated for more clear description, and elements denoted by the same reference numerals in the drawings refer to the same elements.
3 fig. 31 3 is 3 a 3 plan 3 view 3 of 3 a 3 tapping 3 device 3 applied 3 to 3 a 3 furnace 3 body 3 according 3 to 3 an 3 embodiment 3 of 3 the 3 present 3 invention 3, 3 and 3 fig. 32 3 is 3 a 3 side 3 view 3 of 3 fig. 31 3 taken 3 along 3 line 3 a 3- 3 a 3' 3. 3 In one aspect, fig. 10 to 13 show a furnace body to which a tapping device according to an embodiment of the present invention can be applied.
As shown in fig. 1 and 2, a steel tapping apparatus 100 according to an embodiment of the present invention may be provided at a lower portion of a side surface of a furnace body 10.
On the one hand, the Furnace body 10 to which the tapping apparatus 100 according to an aspect of the present invention is applicable may be an Electric non-ferrous metal Furnace (EAF) shown in fig. 1, or may be an Electric Furnace 10 in which a molten steel outflow port 21 shown in fig. 10 is formed upward with a predetermined angle. In the case of FIG. 10, the pressure in the internal space 110 of the tap hole 110 can be adjusted by a pressure adjusting portion 150 described later. Reference numeral H denotes a height from an upper portion of the molten steel MS to an upper portion of the tap hole 110, and S denotes slag.
The Furnace body 10 to which the tapping apparatus 100 according to an embodiment of the present invention is applicable may be a Converter (Converter) of a steel making Furnace for refining molten iron MS as shown in fig. 11, or a Submerged Arc Furnace (SAF) or a continuous casting tundish (tundish) as shown in fig. 12. Reference numeral 1300 in fig. 13 is a ladle (ladle).
Referring back to fig. 1 and 2, in the present invention, Molten Steel outflow ports 21 and 22 (two are shown in fig. 1, but one or three or more ports may be provided according to the embodiment) for discharging Molten Steel (Molten Steel) MS to the outside are formed at a lower portion of a side surface of the furnace body 10, the Molten Steel outflow ports 21 and 22 are sealed by the closed chamber 120, and the pressure inside 121 of the closed chamber 120 can be adjusted by the pressure adjusting unit 150.
In addition, the inside of the closed cavity 120 is provided with a first tap-hole 110, the first tap-hole 110 is formed to penetrate the lower portion of the closed cavity 120 and the upper portion of the first tap-hole 110 protrudes from the lower portion 11 of the furnace body 10 by a predetermined height H, and the molten steel MS flowing in from the molten steel outflow ports 21, 22 can be discharged to the outside through the first tap-hole 110.
Meanwhile, the pressure adjusting unit 150 may be composed of a vacuum forming unit (also referred to as a "pressure reducing unit") 151 and a pressure increasing unit 151, and the vacuum forming unit 151 and the pressure increasing unit 152 may adjust the pressure inside the furnace body 10 by the control of the steel tapping control unit 170.
The vacuum forming unit 151 of the pressure adjusting unit 150, such as a vacuum pump, reduces the pressure inside the closed chamber 120 to a vacuum state. In addition, the pressurizing part 152 of the pressure adjusting part 150 may be a device for introducing a gas such as an inert gas into the inside of the closed chamber 120 to increase the pressure inside the furnace body 10.
According to an embodiment of the present invention, the pressure adjustment portion 150 maintains the inside of the closed cavity 120 in a vacuum state during tapping, so that the height of the molten steel MS flowing into the inside of the closed cavity 120 can be made higher than the protruding height of the first tap hole 110. Then, the gate GT1 at the lower portion of the first tap-hole 110 is opened, and the molten steel MS can be discharged through the first tap-hole 110 due to the hydrostatic pressure.
In contrast, when tapping, the gate GT1 is first opened, and the pressure adjustment portion 150 keeps the inside of the closed cavity 120 in a vacuum state, so that the height of the molten steel MS flowing into the inside of the closed cavity 120 can be made higher than the protruding height of the first tap hole 110.
That is, as steel is discharged, if the water level of the molten steel MS in the closed cavity 120 becomes lower to be similar to the height of the first steel-tapping hole 110, a vortex is generated and the steel discharge may be unstable. Therefore, according to an embodiment of the present invention, the inside of the closed type cavity 120 is maintained in a vacuum state while tapping, so that the height of the molten steel MS flowing in is higher than the protruding height of the first tap hole 110, thereby having an advantage that tapping can be stabilized.
Further, according to an embodiment of the present invention, when melting and refining the raw material charged into the furnace body 10, the pressure adjusting portion 150 pressurizes the inside of the closed chamber 120 so that the molten steel MS does not flow into the closed chamber 120 (backflow), or repeatedly pressurizes and depressurizes the inside of the closed chamber 120 so as to stir (stir) the molten steel MS melted in the furnace body 10.
Further, according to an embodiment of the present invention, when melting and refining the raw material charged into the furnace body 10, the pressure adjusting portion 150 seals the inside of the closed chamber 120, so that the molten steel MS flowing into the closed chamber 120 can be returned to the inside of the furnace body 10 by the pressure generated by the expansion of the gas in the molten steel MS.
In addition, the pressure adjustment portion 150 pressurizes and depressurizes the pressure in the closed-type cavity 120, thereby also enabling batch control of the amount of molten steel MS discharged through the first tap-hole 110.
In one aspect, the partition 130 is used to seal the outer wall of the furnace body 10 and the boundary of the closed-type chamber 120, and the partition 130 is configured to include a steel plate (steel plate) at the inside thereof, and the outside of the steel plate is surrounded by a refractory material, thereby being capable of maintaining airtightness.
Then, a second tap-hole 111 for discharging residual molten steel MS inside the furnace body 10 may be further included beside the first tap-hole 110, penetrating the lower portion 11 of the closed cavity 120. In the case of an inclined furnace body, the second tap hole 111 may be used to discharge molten steel MS inside the furnace body 10.
In addition, the lower part 11 of the furnace body 10 may further include an emergency molten steel outflow port 23 to discharge all of the molten steel MS in the furnace body 10 in an emergency.
On the other hand, the lower portion 11 of the furnace body 10 is formed to be inclined toward the molten steel outflow ports 21 and 22, and the sectional area of the molten steel outflow ports 21 and 22 is made larger than that of the first steel-tapping hole 110, so that there is an advantage that smooth steel tapping is possible.
Then, after the pressure P inside the closed cavity 120, the temperature T of the molten steel MS, and the water level L of the molten steel MS inside the closed cavity 120 are inputted to the steel-tapping control section 170, the pressure adjustment section 150 can be controlled based on these values, and the steel-tapping can be controlled.
Hereinafter, the steel tapping control method will be described in steps with reference to fig. 3 to 5.
Fig. 3 is a schematic view illustrating a pressurizing step of the tapping apparatus 100 performed in a melting step (hereinafter, melting is used as meaning including melting and refining of a raw material) according to an embodiment of the present invention.
In the melting and refining step, the charged raw material is melted, and as shown in fig. 3, in the melting and refining step, the steel tapping control section 170 controls the pressurizing section 152 to pressurize the interior 121 of the closed cavity 120.
As described above, the purpose of pressurizing the inside 121 of the closed chamber 120 is to return the molten steel MS generated in the melting and refining steps to the inside of the furnace body 10.
Alternatively, according to another embodiment of the present invention, in the melting and refining step, the steel-tapping control section 170 controls the pressure adjustment section 150 to repeatedly pressurize and depressurize the inside of the closed cavity 120, thereby stirring the molten steel MS melted in the furnace body 10.
On the other hand, according to an embodiment of the present invention, in order to prevent the pressure inside the furnace body 10 from rising due to pressurization and causing a risk of explosion, a bypass valve (not shown) may be further provided.
At this time, if the pressure inside 121 of the closed chamber 120 exceeds a preset pressure, the steel-tapping control section 170 opens a bypass valve (not shown) to bypass the excess pressure, and the pressure inside the closed chamber 120 can be maintained at a desired pressure.
According to another embodiment of the present invention, the steel tapping control part 170 may not additionally pressurize the inside 121 of the closed cavity 120. At this time, the molten steel MS flowing into the closed cavity 120 can be returned to the furnace body 10 by the pressure generated by the expansion of the gas generated in the molten steel MS.
In the embodiment, by adjusting the pressure inside the closed chamber 120, it is possible to obtain an effect of returning the molten steel MS to the inside of the furnace body 10 or stirring the molten steel MS.
On the other hand, fig. 4 and 5 are schematic views illustrating a tapping step of the tapping apparatus according to an embodiment of the present invention.
As shown in fig. 4, in the tapping step, when the temperature T of the molten steel MS reaches the preset tapping temperature, the tapping control part 170 decompresses the inside 121 of the closed cavity 120 to maintain a vacuum state (the vacuum state refers to a desired target pressure in the present invention), so that the height of the molten steel MS flowing into the inside 121 of the closed cavity 120 can be made higher than the protruding height H of the first tap hole 110.
Then, as shown in fig. 5, the lower gate GT1 is opened, and the molten steel MS may be discharged through the first tap hole 110 due to the hydrostatic pressure.
At this time, the steel-tapping control part 170 controls the pressure adjustment part 150 to pressurize and depressurize the inside of the enclosed cavity 120, thereby also being capable of batch-controlling the amount of molten steel MS discharged through the first steel-tapping hole 110. That is, the height of the molten steel MS flowing into the inside 121 of the closed type cavity 120 is higher than the protruding height H of the first tap hole 110 in the vacuum state of the reduced pressure, and the molten steel MS can be discharged through the first tap hole 110, and even if the vacuum state is released by pressurizing after discharging the predetermined amount of molten steel MS, the height of the molten steel MS is lower than the protruding height H of the first tap hole 110, and thus the molten steel MS cannot be discharged.
In one aspect, FIG. 6 is a side view taken along line B-B' of FIG. 1, illustrating a schematic view of second tap-hole 111.
As shown in fig. 6, tapping device 100 may further comprise a second tapping hole 111. Specifically, the second tap-hole 111 is located beside the first tap-hole 110, and is formed to penetrate the lower part 11 of the closed cavity 120, so that the residual molten steel MS inside 121 of the closed cavity 120 can be discharged. In case of an inclined furnace body, the second tap hole 111 may be used to discharge molten steel MS inside the furnace body 10.
Next, fig. 7 is a schematic view showing a plurality of closed chambers provided in a furnace body according to an embodiment of the present invention.
As shown in fig. 7, the tapping device may include a plurality of tapping devices 100, 400 provided with a first tap-hole 110 and a second tap-hole 111, and the additional tapping device 400 may be configured in the same manner as the conventional tapping device 100. Although two tapping devices 100, 400 are shown in fig. 7, it should be noted that the number of tapping devices 100, 400 may be three or more.
In addition, according to an embodiment of the present invention, first tap-hole 110 and second tap-hole 111 can be provided separately according to another closed cavity.
In one aspect, FIG. 9a is a plan view of a tapping device applied to a furnace body according to an embodiment of the present invention, and FIG. 9b is a side view of FIG. 9a taken along line C-C'.
As shown in fig. 9a and 9b, the outer wall of the furnace body 10 and the closed chamber 120 may be coupled by a coupling portion 910 of the flange structure 911 so that the furnace body 10 and the closed chamber 120 can be separated.
As described above, the closed chamber 120 is detachably installed on the outer wall of the furnace body 10, so that the sand filling operation can be conveniently performed, and the maintenance is convenient.
As described above, according to an embodiment of the present invention, a closed cavity is formed in a lower portion of a side surface of a furnace body, a first tap hole having a predetermined height is formed in the closed cavity by penetrating the closed cavity, and an upper portion of the closed cavity protrudes from a lower portion of the furnace body, and then a pressure in the closed cavity is adjusted, thereby enabling steel tapping without tilting without using a siphon effect.
In addition, according to an embodiment of the present invention, the inside of the closed type cavity is maintained in a vacuum state while tapping, and the height of the molten steel MS flowing in is made higher than the protruding height of the first tap hole, so that the tapping can be stabilized.
In addition, according to another embodiment of the present invention, the steel is tapped from the lower portion of the furnace body, so that the slag can be effectively prevented from being mixed, and the amount of tapped steel can be controlled in batches by adjusting the pressure inside the closed cavity.
In one aspect, fig. 8 is a flowchart for explaining a tapping control method according to an embodiment of the present invention. In order to simplify and clarify the present invention, descriptions overlapping with the items described in fig. 1 to 7 and 9a to 13 are omitted here.
As shown in fig. 1 to 7, the tapping control method according to the embodiment of the present invention starts with a raw material charging step (S810) of charging raw materials into the furnace body 10.
Then, in the melting and refining step (S820), the charged raw material may be melted (S820).
Specifically, the charged raw material is melted in the melting and refining step, and as shown in fig. 3, the tapping control section 170 controls the pressurizing section 152 to pressurize the inside 121 of the closed-type cavity 120 in the melting and refining step.
As described above, the purpose of pressurizing the inside 121 of the closed chamber 120 is to return the molten steel MS generated in the melting and refining steps to the inside of the furnace body 10.
Alternatively, according to another embodiment of the present invention, in the melting and refining step, the steel-tapping control section 170 controls the pressure adjustment section 150 to repeatedly pressurize and depressurize the inside of the closed cavity 120, thereby stirring the molten steel MS melted in the furnace body 10.
In addition, according to another embodiment of the present invention, the steel tapping control part 170 repeats the vacuum state maintenance and the vacuum release of the closed cavity 120, and thus the molten steel MS flowing into the closed cavity 120 can be returned to the furnace body 10.
According to another embodiment of the present invention, the steel tapping control part 170 may not additionally pressurize the inside 121 of the closed cavity 120. That is, at this time, the molten steel MS flowing into the inside of the closed chamber 120 may flow back to the inside of the furnace body 10 by the pressure generated by the expansion of the gas generated from the molten steel MS.
As explained in the embodiments, the effect of returning the molten steel MS to the inside of the furnace body 10 or stirring the molten steel MS can be obtained.
Then, in the tapping step (S831 to S833, S841 to S843), the molten steel MS may be discharged through the first tapping portion 110.
The left tapping step (S831 to S833) and the right tapping step (S841 to S843) in fig. 8 are different in that the order of tapping (S831, S842) and vacuum start (S832, S841) can be changed.
That is, the molten steel MS may be discharged after the discharge of the molten steel MS is started, while maintaining the inside of the closed-type chamber 120 in a vacuum state (S831 to S833) or in a state of maintaining the inside of the closed-type chamber 120 in a vacuum state (S841 to S843).
First, explaining the right-hand tapping steps (S841 to S843), when the temperature T of the pressurized molten steel MS reaches the preset tapping temperature, the tapping control part 170 keeps the inside 121 of the closed cavity 120 in a vacuum state (the vacuum state means a desired target pressure in the present invention), so that the height of the molten steel MS flowing into the inside 121 of the closed cavity 120 can be made higher than the protruding height H of the first tap hole 110 (S841).
Then, as shown in fig. 5, the lower gate GT1 is opened, and the molten steel MS is discharged through the first tap hole 110 due to the hydrostatic pressure (S842).
At this time, the steel-tapping control part 170 controls the pressure adjustment part 150 to pressurize and depressurize the inside of the enclosed cavity 120, thereby also being able to control the amount of molten steel MS discharged through the first steel-tapping hole 110 in a batch manner. That is, the height of the molten steel MS flowing into the inside 121 of the closed type cavity 120 is higher than the protruding height H of the first tap-hole 110 in the vacuum state of the reduced pressure, and the molten steel MS can be discharged through the first tap-hole 110, and after a predetermined amount of the molten steel MS is discharged, the height of the molten steel MS is lower than the protruding height H of the first tap-hole 110, and thus the molten steel MS cannot be discharged.
Finally, the steel tapping control section 170 controls the pressure adjustment section 150 to reduce the pressure so as to equalize the pressure with the atmosphere or to increase the pressure so as to release the vacuum state (S843).
In contrast, describing the left tapping steps (S831 to S833), when the temperature T of the pressurized molten steel MS reaches the preset tapping temperature, the tapping control part 170 opens the lower gate GT1, at which time the molten steel MS can be discharged through the first tap hole 110 due to the hydrostatic pressure.
Then, the steel-tapping control part 170 controls the pressure adjustment part 150 to maintain the inside 121 of the closed cavity 120 in a vacuum state (the vacuum state means a desired target pressure in the present invention), so that the height of the molten steel MS flowing into the inside 121 of the closed cavity 120 is higher than the protruding height H of the first steel-tapping hole 110 (S832).
Similarly, the steel-tapping control part 170 controls the pressure adjustment part 150 to pressurize and depressurize the inside of the enclosed cavity 120, thereby also batch-controlling the amount of molten steel MS discharged through the first steel-tapping hole 110.
Finally, the steel tapping control section 170 controls the pressure adjustment section 150 to reduce the pressure, thereby releasing the vacuum state (S833).
In one aspect, according to an embodiment of the present invention, the tapping control part 170 may further include a step of estimating the amount of molten steel in the furnace body 10 using the pressure inside the closed cavity 120.
That is, the pressure inside the closed chamber 120 and the amount of molten steel MS in the furnace body 10 have a certain relationship, and the amount of molten steel in the furnace body 10 can be estimated from the pressure inside the closed chamber 120 by storing the pressure inside the closed chamber 120 and the amount of molten steel MS in the furnace body 10 in advance using a mathematical model or in a look-up table.
As described above, according to an embodiment of the present invention, a closed cavity is formed in a lower portion of a side surface of a furnace body, a first tap hole having a predetermined height is formed in the closed cavity by penetrating the closed cavity, and an upper portion of the closed cavity protrudes from a lower portion of the furnace body, and then a pressure in the closed cavity is adjusted, thereby enabling steel tapping without tilting without using a siphon effect.
In addition, according to an embodiment of the present invention, the inside of the closed type cavity is maintained in a vacuum state during steel tapping, and the height of the molten steel flowing in is made higher than the protruding height of the first steel-tapping hole, so that steel can be stably tapped.
In addition, according to another embodiment of the present invention, the steel is tapped from the lower portion of the furnace body, so that the slag can be effectively prevented from being mixed, and the amount of tapped steel can be controlled in batches by adjusting the pressure inside the closed cavity.
The present invention is not limited to the above embodiment and the drawings. It will be understood by those skilled in the art that the scope of the claims is defined by the appended claims, and that various substitutions, modifications and changes in form may be made without departing from the scope of the technical idea of the present invention described in the claims.
Claims (19)
1. A tapping device for tapping steel by vacuum, characterized in that it comprises:
a closed chamber which is sealed at a molten steel outlet formed at a lower portion of a side surface of the furnace body, accommodates molten steel flowing in through the molten steel outlet, and is configured such that a pressure inside the closed chamber can be adjusted; and
a first steel-tapping hole provided inside the closed cavity, having a straight line shape, vertically penetrating through a lower portion of the closed cavity and protruding from a lower portion of the furnace body to an inside of the closed cavity by a predetermined height, to discharge molten steel, which flows into the inside of the closed cavity through the molten steel outflow port, to an outside; and
and a pressure adjustment unit for maintaining the inside of the closed cavity in a vacuum state during tapping of the molten steel so that the height of the molten steel flowing into the closed cavity is higher than the protruding height of the first tap hole, and discharging the molten steel to the outside through the first tap hole.
2. The tapping apparatus according to claim 1, wherein the pressure adjusting portion pressurizes the inside of the closed cavity so that the molten steel does not flow into the closed cavity, or repeatedly pressurizes and depressurizes the inside of the closed cavity, thereby stirring the molten steel melted in the furnace body, when melting and refining the raw material charged into the furnace body.
3. The tapping device according to claim 1, characterized in that the tapping device further comprises a second tap hole formed to penetrate a lower portion of the closed cavity, discharging residual molten steel inside the furnace body.
4. The tapping apparatus as set forth in claim 1, wherein the tapping apparatus further comprises an emergency molten steel outflow port formed to penetrate a lower portion of the furnace body, and discharging all molten steel in the furnace body in an emergency.
5. The tapping device according to claim 3, characterized in that the tapping device comprises a plurality of closed cavities having second tap-holes discharging molten steel inside the furnace body in a state that the closed cavities include the first tap-holes and the second tap-holes.
6. Tapping device according to claim 3, characterised in that the first tapping hole and the second tapping hole are provided separately by a further closed cavity.
7. The tapping device as set forth in claim 1, wherein a lower portion of the furnace body is formed to be inclined toward a molten steel outflow port side to smoothly discharge the molten steel.
8. The tapping device according to claim 1, wherein a partition for sealing is provided at the boundary between the outer wall of the vessel body and the closed cavity, the partition being composed of a steel plate provided inside the partition and a refractory material surrounding the steel plate.
9. The tapping device as claimed in claim 1, wherein the outer wall of the vessel body and the closed cavity are configured to be joined by a joint portion of the flange structure.
10. The tapping device as claimed in claim 1, characterised in that the cross-sectional area of the molten steel outflow opening is greater than the cross-sectional area of the first tapping hole.
11. The tapping apparatus as claimed in claim 1, wherein the vessel is any one of a vessel of an electric furnace or a vessel of a converter and a continuous casting tundish.
12. A tapping control method of a tapping apparatus using vacuum tapping, the tapping apparatus comprising: a closed chamber which is sealed at a molten steel outlet formed at a lower portion of a side surface of the furnace body and which can adjust a pressure inside the closed chamber by pressurizing an injected gas and reducing the pressure by vacuum; and a first steel-tapping hole provided inside the closed cavity, having a straight line shape, vertically penetrating through a lower portion of the closed cavity and protruding from a lower portion of the furnace body to an inside of the closed cavity by a predetermined height, to discharge molten steel, which flows into the inside of the closed cavity through the molten-steel outflow port, to an outside, wherein the steel-tapping control method includes:
a raw material charging step of charging raw materials into a furnace body;
a melting and refining step of melting and refining the raw materials in the furnace body into molten steel; and
a tapping step of discharging molten steel melted and refined through the first tap hole,
wherein the tapping step comprises the following steps: the inside of the closed type cavity is maintained in a vacuum state so that the height of the molten steel flowing into the inside of the closed type cavity is higher than the protruding height of the first steel-tapping hole, and the molten steel is discharged to the outside through the first steel-tapping hole.
13. The tapping control method as claimed in claim 12, wherein the melting and refining step comprises a pressure adjusting step of: the inside of the closed chamber is pressurized so that molten steel does not flow into the closed chamber, or the inside of the closed chamber is repeatedly pressurized and depressurized, thereby stirring molten steel melted in the furnace body.
14. The tapping control method of claim 12, wherein the melting and refining step comprises a sealing step: the inside of the closed chamber is sealed, so that the molten steel flowing into the closed chamber is returned to the inside of the furnace body by the pressure generated by the expansion of the gas generated in the molten steel.
15. The tapping control method as claimed in claim 13, wherein the pressure adjusting step further comprises the steps of: when the pressure inside the closed cavity exceeds the preset pressure, the exceeding pressure is bypassed.
16. The tapping control method as set forth in claim 12, wherein the tapping step includes the steps of: the amount of molten steel discharged through the first tap hole is controlled in batches by pressurizing and depressurizing the inside of the closed-type cavity.
17. The tapping control method as set forth in claim 12, wherein the tapping step includes the steps of: and discharging the molten steel melted through the first steel-tapping hole when the temperature of the molten steel reaches a preset tapping temperature.
18. The tapping control method as claimed in claim 12, further comprising the step of estimating the amount of molten steel in the furnace body using the pressure in the closed cavity.
19. The tapping control method as set forth in claim 12, wherein the tapping step includes the steps of: after the start of the discharge of the molten steel, the inside of the closed chamber is maintained in a vacuum state or the molten steel is discharged in a state where the inside of the closed chamber is maintained in a vacuum state.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150136526A KR101713614B1 (en) | 2015-09-25 | 2015-09-25 | Apparatus for tapping molten steel using vacumm and tapping control method using thereof |
| KR1020150136526 | 2015-09-25 | ||
| PCT/KR2016/010719 WO2017052310A1 (en) | 2015-09-25 | 2016-09-23 | Tapping device using vacuum and tapping control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108026597A CN108026597A (en) | 2018-05-11 |
| CN108026597B true CN108026597B (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680055741.7A Active CN108026597B (en) | 2015-09-25 | 2016-09-23 | Vacuum tapping device and tapping control method |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101713614B1 (en) |
| CN (1) | CN108026597B (en) |
| WO (1) | WO2017052310A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2311849A1 (en) * | 1975-05-20 | 1976-12-17 | Tech Des Ind De Fonderie Centr | PROCESS FOR MASTERING THE CAST IRON OF A CUBILOT AND CUBILOT PERFECTED ACCORDING TO THIS PROCEDURE |
| JPS6024313A (en) * | 1983-07-19 | 1985-02-07 | Ishikawajima Harima Heavy Ind Co Ltd | Refining device of molten steel |
| JPH0624313A (en) * | 1992-07-08 | 1994-02-01 | Nissan Motor Co Ltd | Brake force control device for vehicle |
| CZ297606B6 (en) * | 1999-04-01 | 2007-02-07 | Arcmet Technologie Gmbh | Metallurgical vessel having a tapping apparatus |
| DE19919378A1 (en) * | 1999-04-01 | 2000-10-05 | Arcmet Technologie Gmbh Linz | Metallurgical vessel, e.g. a tilting arc furnace, has a heated tapping siphon tube with an overflow edge located above the tube inlet upper edge in the vessel operating position |
| UA79599C2 (en) * | 2001-09-26 | 2007-07-10 | Sms Demag Ag | Arc furnace with melt tapping through the bay window (variants) and method for arc furnace operating (variants) |
| KR101047579B1 (en) | 2008-12-30 | 2011-07-07 | 주식회사 포스코 | Tapping device and tapping method |
-
2015
- 2015-09-25 KR KR1020150136526A patent/KR101713614B1/en active IP Right Grant
-
2016
- 2016-09-23 CN CN201680055741.7A patent/CN108026597B/en active Active
- 2016-09-23 WO PCT/KR2016/010719 patent/WO2017052310A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| KR101713614B1 (en) | 2017-03-08 |
| CN108026597A (en) | 2018-05-11 |
| WO2017052310A1 (en) | 2017-03-30 |
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