KR20150113428A - Apparatus for repairing decarbonization equipment of molten steel and method for the same - Google Patents

Abstract

Disclosed are a device and a method to repair a decarbonizing facility of molten steel. Provided is a device and a method to repair a decarbonizing facility of molten steel wherein the device to repair a decarbonizing facility of molten steel comprises: a spray installed inside a pipe to move molten steel of a decarbonizing facility of molten steel to be able to move vertically, spraying refractories on an inner side wall of the pipe to move molten steel; a measurer arranged inside the pipe for moving molten steel to measure a corrosion depth of the inner side wall of the pipe to move molten steel by molten steel; and a control part to adjust an amount of the refractories sprayed from the spray depending on the corrosion depth of the inner side wall of the pipe to move the molten steel which is measured by the measurer.

Description

[0001] DESCRIPTION [0002] APPARATUS FOR REPAIRING DECARBONIZATION EQUIPMENT OF MOLTEN STEEL AND METHOD FOR THE SAME [0003]

The present invention relates to a molten steel decarburization equipment repairing apparatus and a repairing method.

The steelmaking process proceeds in the order of iron wire pre-treatment, converter refining, secondary refining and continuous casting. Conversion refining is a process of blowing oxygen gas into a molten iron and treating it, and the result is molten steel.

After finishing the converter refinement, the molten steel introduced in the converter has many impurities and most of the components of the desired steel are under. Therefore, a work for removing impurities (e.g., carbon components), gas, and the like is carried out by containing molten steel in a separate vessel or ladle. This process is called out-of-process refining process.

In the out-of-process refining process, various methods of removing impurities (carbon) from steel using vacuum degassing and oxygen, argon gas, or the like can be used. The vessel used for the degassing operation and the impurity removing operation of the molten steel reflux the molten steel through the reflux pipe to remove the impurities and gas in the molten steel. do.

The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0011734 (Jan. 30, 201, a vacuum degassing apparatus and a refining method using the same).

Embodiments of the present invention provide a repairing apparatus and a repairing method for a molten steel decarburizing apparatus that can be easily repaired.

According to an aspect of the present invention, there is provided a molten steel decarburization apparatus comprising: an injector installed vertically movably in a molten steel moving pipe for injecting refractory material into a side wall of the molten steel moving pipe; A measuring device disposed inside the molten steel moving tube to measure an erosion depth of the inner wall of the molten steel moving pipe by molten steel; And a controller for controlling an amount of refractory injected from the injector according to the depth of erosion of the inner wall of the molten steel moving tube measured by the measuring machine.

The measuring instrument may measure the distance from the reference point to the plurality of measurement points while being fixed to the reference point inside the molten steel moving tube to measure the depth of erosion of the inner wall of the molten steel moving tube by the height of the molten steel moving tube .

The control unit can increase the amount of refractory material injected from the injector as the value calculated by the following formula is larger.

[Expression] L-d / (cos?)

(Where L is a value measured by the measuring instrument, d is a horizontal distance from the reference point to the steel pipe, and? Is a measurement angle).

The measuring instrument may be coupled to the injector so as to be vertically movable within the molten steel moving tube.

According to another aspect of the present invention, there is provided a method of measuring corrosion depth of a molten steel moving vessel, comprising the steps of: measuring an erosion depth of a side wall of the molten steel moving vessel by a measuring instrument disposed inside the molten steel moving vessel; And injecting refractory into the molten steel moving pipe according to the measured depth of erosion of the inner wall of the molten steel moving pipe.

Measuring the erosion depth of the inner wall of the molten steel moving pipe may include measuring a distance from the reference point to a plurality of measurement points in a state of being fixed to a reference point inside the molten steel moving pipe, The erosion depth of the side wall of the moving pipe can be measured.

The method may further include, before the step of injecting the refractory material into the molten steel moving tube, determining a refractory material injection amount using a value calculated by the following equation.

[Expression] L-d / (cos?)

(Where L is a value measured by the measuring instrument, d is a horizontal distance from the reference point to the steel pipe, and? Is a measurement angle).

Measuring the erosion depth of the inner wall of the molten steel moving tube may divide the inner wall of the molten steel moving tube into a plurality of areas and measure the erosion depth for each area.

According to the embodiments of the present invention, the life of the molten steel decarburization facility can be extended, and the convenience of the repair worker can be increased.

1 is a view showing a molten steel decarburization facility.
[0001] The present invention relates to a molten steel decarburization apparatus repairing apparatus,
3 is a flowchart illustrating a method of repairing a molten steel decolonization apparatus according to an embodiment of the present invention.
4 is a view illustrating the measurement of the depth of erosion by the area of the inner wall of the molten steel moving pipe in the method of repairing the molten steel decolonization equipment according to the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same or corresponding components are denoted by the same reference numerals And redundant explanations thereof will be omitted.

FIG. 1 is a view showing a molten steel decarburization apparatus, and FIG. 2 is a view showing a molten steel decarburization apparatus repairing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the molten steel decanter 10 may include a vacuum vessel 11, a molten steel moving pipe 12, and an argon gas injector 13. The argon gas helps the molten steel M continue to circulate from the ladle L to the vacuum vessel 11 and from the vacuum vessel 11 to the ladle L along the pair of molten steel moving pipes 12. [

However, the inner wall of the molten steel moving tube 12 may be damaged by the flow of the molten steel M. Particularly, the inner wall of the molten steel pipe 12 in which the argon gas injector 13 is installed may be damaged more greatly.

Therefore, after the decarburization process is completed in the molten steel decarburization facility 10, the maintenance of the molten steel pipe 12 is required. The repair of the molten steel pipe 12 may be performed by injecting refractory material into the side wall of the molten steel pipe 12. However, since the molten steel pipe 12 is maintained at a high temperature, it is difficult to observe the degree of erosion with the naked eye, and it is not easy to determine the repair position and the amount of refractory.

Referring to FIG. 2, the molten steel decanter 10 repair apparatus may include an injector 110, a meter 120, and a control unit.

The injector 110 is a mechanism for spraying the refractory R on the inner wall of the molten steel moving pipe 12 and may be connected to the refractory supply part. In addition, the injector 110 may be installed in the molten steel moving pipe 12 so as to be movable up and down. In this case, the injector 110 is coupled to the bar 111 passing through the inside of the molten steel moving tube 12, and the bar 111 can move up and down inside the molten steel moving tube 12.

The injector 110 can wait outside the molten steel moving tube 12 when the molten steel decarburization apparatus 10 is in operation and the injector 110 can wait in the molten steel decanter 10 after the molten steel decanter 10 is in operation, The refractory R can be injected while moving up and down from the inside.

The measuring instrument 120 is a mechanism for measuring the depth of erosion of the inner wall of the molten steel moving tube 12 and can be disposed inside the molten steel moving tube 12. [ The measuring instrument 120 may include a distance sensor such as an infrared sensor or a laser sensor.

The meter 120 may be coupled to the bar 111 of the injector 110. In this case, the measuring instrument 120 can move up and down inside the molten steel moving tube 12 together with the injector 110.

The measuring instrument 120 can measure the measurement depth while being fixed to the reference point inside the molten steel moving pipe 12. [ As shown in FIG. 2, the measuring instrument 120 can set the lower end of the molten steel pipe 12 as a reference point.

The measuring instrument 120 can measure distances from the reference point to the plurality of measurement points, respectively. That is, the measuring instrument 120 can measure the distance with a certain angle toward the measuring point.

2, when the reference point is a and the measurement points are b1 and b2, the measuring instrument 120 measures the distances L1 and L2 from the state fixed to the point a to the points b1 and b2, respectively .

Here, the measuring instrument 120 can be adjusted to the angles? 1 and? 2 to measure distances up to b1 and b2. The angles? 1 and? 2 refer to the respective angles formed by the line horizontally connected from the reference point to the inner wall of the molten steel pipe 12 and the line connecting the reference point and the measurement points b1 and b2. In this specification, Angle. &Quot; The measurement angle can be measured by the measuring device 120. [

When the measuring instrument 120 measures the distance to the plurality of measuring points while being fixed to the reference point, if the plurality of measuring points are arranged side by side in the longitudinal direction of the steel pipe moving tube 12, (12) The depth of erosion can be measured by height.

The control unit can adjust the amount of the refractory R injected from the injector 110 according to the depth of erosion of the inner wall of the molten steel moving pipe 12 measured by the measuring device 120. [

When measuring the distance to the plurality of measurement points while the measuring instrument 120 is fixed to the reference point, the control unit calculates the amount of the refractory R to be injected from the injector 110 in proportion to the value calculated from the following formula .

[Expression] L-d / (cos?)

Here, L denotes a value measured by the measuring instrument 120, d denotes a horizontal distance from the reference point to the molten steel pipe 12, and? Denotes a measurement angle. Particularly, d may be the same value as the diameter of the molten steel moving pipe 12 if the reference point of the measuring instrument is at the lowermost part of the molten steel moving pipe and the thickness of the measuring device 120 is ignored.

The larger the value calculated by the above equation, the greater the erosion depth. 2, for example, the calculated value (x1) at the point b1 is

x1 = L1-d / cos? 1 = s1

Lt; / RTI &

The calculated value (x2) at point b2 is

x2 = L2-d / cos? 2 = s2

.

Since the length of s1 is shorter than the length of s2, it can be seen that the degree of erosion at point b1 is smaller than the level of erosion at point b2.

When the calculated values are obtained for a plurality of points arranged in the longitudinal direction of the molten steel moving pipe 12 using the above equation, a map relating to the degree of erosion according to the height of the molten steel moving pipe 12 can be drawn have. This is because the inner wall of the molten steel moving pipe 12 can be coordinateed by the reference point and the measurement angle.

The control unit determines the amount of refractory R to be injected in the injector 110 based on the map and the injector 110 injects an appropriate amount of refractory R to the point so that the refractory R can be repaired have.

The apparatus for repairing a molten steel decarburization apparatus according to an embodiment of the present invention has been described above. Next, a method for repairing a molten steel decarburization apparatus according to an embodiment of the present invention will be described.

FIG. 3 is a flowchart illustrating a method of repairing a molten steel decarburization apparatus according to an embodiment of the present invention. FIG. 4 is a schematic view illustrating a method of repairing a molten steel decarburization apparatus according to an embodiment of the present invention. As shown in FIG.

Referring to FIG. 3, the method for repairing a molten steel decarburization apparatus according to an embodiment of the present invention includes a step S110 of measuring the depth of erosion of the inner wall of the molten steel moving pipe, a step S120 of determining the amount of refractory injection according to the depth of erosion, And injecting the refractory (S130).

A step S110 of measuring the depth of erosion of the inner wall of the molten steel moving tube is a step of measuring the distance to the inner wall of the molten steel moving tube 12 by arranging the measuring instrument 120 inside the molten steel moving tube 12. [

The measuring instrument 120 measures the distance from the reference point to a plurality of measurement points while being fixed to the reference point inside the molten steel moving pipe 12 and measures the depth of erosion by the height of the steel pipe moving pipe 12 have. The plurality of measuring points may be arranged in the longitudinal direction of the molten steel moving tube 12. [

On the other hand, as shown in FIG. 4, the inner wall of the molten steel moving pipe 12 can be divided into a plurality of regions A, B, C, and D, and the depth of erosion can be measured for each region. In this case, the meter 120 may be disposed on the opposite side of the area. As described above, when the erosion depth is measured for each area by dividing the area into a plurality of areas, it is possible to repair the entire inside wall of the molten steel moving pipe 12.

3, step S120 of determining the refractory injection amount according to the depth of erosion is a step of determining the amount of refractory injection R according to the depth of erosion measured by the measuring instrument 120, When the erosion depth is measured by the height of the moving pipe 12, the amount of refractory (R) injection may be determined using a value calculated by the following equation.

[Expression] L-d / (cos?)

Where L is the value measured by the measuring instrument, d is the horizontal distance from the reference point to the molten steel pipe, and θ is the measurement angle. In particular, d may be equal to the diameter of the molten steel moving tube, if the thickness of the measuring device is ignored.

Since the degree of erosion becomes larger as the calculated value by the above formula is larger, the injection amount of the refractory R can be determined in proportion to the calculated value.

In step S130, the injector 110 moves upward and downward in the molten steel moving pipe 12 and injects an appropriate amount of refractory R to the point.

The degree of erosion can be quantified and plotted by the above formula. Refractory (R) injection may be based on the map. Further, when the erosion depth is divided into a plurality of areas and measured, a map for each area can be shown, and the refractory (R) injection can be made for each area.

As described above, according to the apparatus and method for repairing a molten steel decarburization apparatus according to an embodiment of the present invention, the degree of erosion of the molten steel moving pipe can be quantitatively determined, It can be easily and smoothly repaired. Accordingly, the life of the molten steel decarburization facility can be guaranteed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

M: Molten steel
L: Ladle
R: Refractory
10: Molten steel decarburization equipment
11: Vacuum vessel
12:
13: Argon gas injector
100: Equipment for repairing molten steel decarburization equipment
110: Injector
111: Bar
120: Measuring instrument

Claims (8)

An injector installed vertically movably in a molten steel moving pipe of the molten steel decanting facility for injecting refractory into a side wall of the molten steel moving pipe;
A measuring device disposed inside the molten steel moving tube to measure an erosion depth of the inner wall of the molten steel moving pipe by molten steel; And
And a controller for controlling the amount of refractory sprayed from the injector according to the depth of erosion of the inner wall of the molten steel moving tube measured by the measuring device.
The method according to claim 1,
The measuring device measures the distance from the reference point to a plurality of measurement points while being fixed to the reference point inside the molten steel moving tube and measures the erosion depth of the inner wall of the molten steel moving tube by the height of the moving steel pipe Equipment for repairing molten steel decarburization equipment.
3. The method of claim 2,
Wherein the controller increases the amount of refractory sprayed from the injector as the value calculated by the following equation is larger.
[Equation] Ld / (cos?)
(Where L is a value measured by the measuring instrument, d is a horizontal distance from the reference point to the steel pipe, and? Is a measurement angle).
The method according to claim 1,
Wherein the measuring instrument is coupled to the injector so as to be movable up and down inside the molten steel moving tube.
Measuring an erosion depth of the inner wall of the molten steel moving pipe by a measuring device disposed inside the molten steel moving pipe of the molten steel decarbonating facility; And
And injecting the refractory into the molten steel moving pipe according to the measured depth of erosion of the inner wall of the molten steel moving pipe.
6. The method of claim 5,
The step of measuring the depth of erosion of the inner wall of the molten steel moving pipe comprises:
Measuring a distance from the reference point to a plurality of measurement points while being fixed to a reference point inside the molten steel moving pipe and measuring an erosion depth of the inner wall of the molten steel moving pipe by the height of the molten steel moving pipe, How to repair the decanter facilities.
The method according to claim 6,
Before the step of injecting the refractory into the molten steel moving tube,
And determining a refractory injection quantity using a value calculated by the following equation.
[Equation] Ld / (cos?)
(Where L is a value measured by the measuring instrument, d is a horizontal distance from the reference point to the steel pipe, and? Is a measurement angle).
6. The method of claim 5,
The step of measuring the depth of erosion of the inner wall of the molten steel moving pipe comprises:
Wherein the inner wall of the molten steel moving tube is divided into a plurality of regions and the depth of erosion is measured for each of the regions.

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