KR102024619B1 - Apparatus for heating furnace - Google Patents

Abstract

The present invention is a heating furnace for heating a cast steel; A door disposed in the heating furnace; A driving unit connected to the door; and a control unit connected to the driving unit to control the movement of the door, wherein the control unit adjusts an opening height of the door according to the thickness of the cast steel when the door is opened. It provides a device by heating.

Description

Furnace apparatus {APPARATUS FOR HEATING FURNACE}

Embodiments relate to a furnace apparatus.

In all rolling lines such as hot rolled steel, thick plates, and wire rods, the heat source is first combusted in a heating furnace to heat the inside of the heating furnace to 1000 degrees or more, and the cast iron is placed inside the heating furnace. Most furnaces are divided into preheating zone, 1st heating zone, 2nd heating zone, 3rd heating zone and crack zone. The second and third heating zones are set to the highest temperature, and the work is performed to match the surface and central temperature as a whole at a slightly lower temperature in the cracking zone.

When the entrance door of the furnace is opened, the charging machine (Palger) puts the cast into the furnace. On the other hand, when the exit door of the furnace is opened, an extractor enters the furnace and pulls out the cast. At this time, when the entrance door or the exit door is opened, there is a problem that the temperature inside the heating furnace decreases, and the atmosphere gas inside the heating furnace flows out. Korean Unexamined Patent Publication No. 2012-0043954 (2012.05.07, hereinafter referred to as "this document") discloses a device for blocking air inflow to a heating furnace. The gas injection nozzles installed at the inlet and the outlet of the furnace are connected to the exhaust pipe and the exhaust gas pipe of the furnace to form an exhaust gas curtain, thereby preventing heat loss and external air infiltration of the furnace. However, since the inlet and the outlet of the present document are completely open, there is a limit in preventing the heat loss of the furnace and the leakage of the atmosphere gas only by the exhaust gas curtain.

The embodiment is to solve this problem, and when the entrance door or the exit door is opened, to provide a furnace apparatus to minimize the heat loss inside the furnace, and to minimize the outflow of the atmosphere gas inside the furnace to the outside. For that purpose.

However, the object of the present invention is not limited to the above-mentioned matters, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In accordance with an embodiment, a heating furnace for heating a cast steel, a door disposed in the heating furnace, a drive unit connected to the door and a control unit connected to the drive unit, the control unit for controlling the movement of the door, the control unit When the door is opened, the heating apparatus may adjust the opening height of the door according to the thickness of the cast steel.

Preferably, the opening height may be within 1.5 times to 2 times the thickness of the cast steel.

Preferably, the door includes a plurality of divided doors disposed along the width direction of the door, and the control unit selectively selects the plurality of divided doors corresponding to the width of the cast steel when the door is opened. It can be opened by the opening height.

Preferably, the plurality of divided doors may be arranged symmetrically with respect to a reference line passing through the center of the door in the width direction.

Preferably, the divided door disposed on one side of the reference line and opened by the opening height, and the divided door disposed on the other side of the reference line and opened by the opening height are symmetric with respect to the reference line. Can be arranged.

Preferably, the width of at least one of the plurality of divided doors may be different from that of other divided doors.

Preferably, the door is arranged in the width direction of the door, it may include an injection unit for injecting combustible gas to the upper surface of the cast when opening the door.

Preferably, the injection unit comprises a plurality of nozzles arranged in the width direction of the door, each of the nozzles comprises a plurality of unit nozzles, at least one of the plurality of unit nozzles is the front or rear of the door It may be disposed to be inclined toward.

Preferably, the door includes a door body, a blocking plate disposed at the rear of the door body and including a coolant, and an injection height adjusting unit for connecting the blocking plate and the spraying unit to adjust the spraying height of the spraying unit. can do.

Preferably, the control unit is connected to the injection height adjusting unit, it is possible to adjust the injection height corresponding to the opening height.

According to an embodiment, it provides an advantageous effect of minimizing heat loss inside the furnace.

According to an embodiment, it provides an advantageous effect of preventing the atmosphere gas inside the furnace from flowing out or the outside air into the furnace.

1 shows a furnace apparatus according to an embodiment,
2 is a view showing the heating furnace shown in FIG.
3 is a view showing in detail the slab charged into the heating furnace,
4 is a diagram illustrating a control unit.
5 is a view showing the front of the door,
6 is a side view of the door,
7 is a view showing the back of the door,
8 and 9 are views showing the selective opening and closing of the divided door, corresponding to the width of the cast steel,
10 is a view showing in detail the injection portion,
11 is a view illustrating a unit nozzle of an injection unit.

Hereinafter, a heating apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. It will be described in detail focusing on the parts necessary to understand the operation and action according to the present invention.

In addition, in describing the components of the present invention, different reference numerals may be given to components having the same name according to the drawings, and the same reference numerals may be given even though they are different drawings. However, even in such a case, it does not mean that the corresponding components have different functions according to the embodiments, or does not mean that they have the same functions in different embodiments, and the functions of the respective components may be implemented. Judgment should be made based on the description of each component in the example.

The cast steel described below is a semi-finished product for making a steel sheet, and may be called as a slab, a blob, or a fillet according to its size and shape. A furnace is a device for preheating or heating such cast pieces. By the way. When charging or extracting the cast into the inside of the furnace, the door was opened, the inside of the furnace was opened to the outside, the temperature inside the furnace fell, and the atmosphere inside the furnace outflowed gas to the outside. The furnace apparatus according to the embodiment is a device designed to minimize the opening of the inside of the furnace to the outside, even if the door is opened, to fundamentally solve this problem.

1 is a view showing a furnace apparatus according to the embodiment, Figure 2 is a view showing the furnace shown in FIG.

1 and 2, the heating apparatus according to the embodiment may include a heating furnace 100, a door 200, a driving unit 300, and a control unit 400.

The heating furnace 100 is an apparatus for heating the slab 10 to an appropriate temperature of approximately 1200 to 1300 ° C., and is disposed in all processes of a hot rolling process for processing into a product such as a sheet material. A heating space is provided inside the heating furnace 100.

The door 200 is disposed in the heating furnace 100. The door 200 may include an entrance door 200A and an exit door 200B. The entrance door 200A is disposed at the inlet 101 of the heating furnace 100. The exit door 200B is disposed at the outlet 102 of the heating furnace 100. The door 200 may have a rectangular plate shape.

The driver 300 moves the door 200. The driving unit 300 may be connected to the door 200 to move the door 200 in the vertical direction. The drive unit 300 may include a cylinder driven by hydraulic, pneumatic or motor.

The controller 400 is connected to the driving unit 300 to control the movement of the door 200 to open or close the inlet 101 or the outlet 102 of the heating furnace 100.

When the entrance door 200A moves up and the inlet 101 is opened, the charging machine 1 charges the cast steel 10 into the heating furnace 100. When the cast steel 10 is charged into the heating furnace 100, the charging device 1 is pulled out of the heating furnace 100, the entrance door 200A moves downward, and the inlet 101 is closed. When the heating operation on the cast steel 10 is completed, the exit door 200B moves upward, and when the outlet 102 is opened, the extractor 2 extracts the cast steel 10 from inside the heating furnace 100. When the cast piece 10 is extracted from the heating furnace 100, the extractor 2 is pulled out of the heating furnace 100, the exit door 200B moves downward, and the outlet 102 is closed.

Referring to FIG. 2, the heating furnace 100 may be divided into a preheating zone 110, a heating zone 120, and a crack zone 130. The temperature of the heating table 120 is set highest. The crack zone 120 maintains a relatively low temperature to match the surface temperature of the slab 10 with the temperature of the center portion.

3 is a view showing in detail the slab charged into the heating furnace.

The z-axis of FIG. 3 represents the height direction of the heating furnace 100, and the y-axis of FIG. 3 represents the moving direction of the slab 10. Referring to FIG. 3, the sensor 420 may be disposed in front of the heating furnace 100. The sensor 420 detects the slab 10. When the slab 10 is detected, the controller 400 operates the driving unit 300. When the driving unit 300 is operated, the door 200 moves upward, and the inlet 101 of the heating furnace 100 is opened. At this time, when the door 200 moves upward, the inlet 101 of the heating furnace 100 is opened. If the inlet 101 is fully open, the heat loss of the furnace 100 and the atmospheric gas leakage in the furnace 100 will be significant. In this embodiment, corresponding to the thickness t of the cast steel 10, the opening height (h) of the door 200 is to be adjusted.

Here, the opening height h1 indicates the degree of opening of the inlet 101 or the outlet (102 in FIG. 1), and is a vertical distance from the upper end of the support 20 supporting the slab 10 to the lower end of the door 200. It can be defined as.

4 is a diagram illustrating a control unit.

3 and 4, the control unit 400 adjusts the opening height h1 of the door 200 in response to the thickness t of the cast steel 10 when the door 200 is opened. The opening height h1 may range from 1.5 times to 2 times the thickness t of the cast piece 10.

For example, when the slab 10 is a slab and the thickness t of the slab is 250 mm to 300 mm, the opening height h1 may be within a range of 375 mm to 600 mm. When the door 200 is adjusted to such an opening height h1, it is not necessary to completely open the inlet 101 of the heating furnace 100 unnecessarily. At the opening height h1, while the slab 10 is easily charged into the heating furnace 100, the gap between the slab 10 and the door 200 is minimized, so that heat inside the heating furnace 100 is lost. Or to prevent the atmosphere gas inside the furnace 100 from being exposed to the outside.

The thickness t of the cast steel 10 may be input to the input unit 410 by the operator or the sensing unit 420. The detector 420 may detect the thickness t of the slab 10 charged in the heating furnace 100 and input the same to the input unit 410. The detector 420 may include a camera that acquires image information of the cast steel 10, and may detect a thickness t of the cast steel 10 based on the obtained image information.

In addition, in the embodiment, when the door 200 is opened, the inlet 101 of the heating furnace 100 exposed to the outside not only in the height direction of the heating furnace 100 but also in the width direction of the heating furnace 100. By minimizing the area or the area of the outlet 102, it is intended to prevent the heat inside the furnace 100 is lost, or the atmosphere gas inside the furnace 100 is exposed to the outside.

5 is a view showing the front of the door.

Referring to FIG. 5, the door 200 may include a plurality of divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211. The plurality of divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 are arranged in the width direction (the x-axis direction of FIG. 5) of the heating furnace 100. Each divided door 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211 can move independently. Each of the divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 may be slidably coupled to each other in the height direction (z-axis direction of FIG. 5) of the door 200.

5C denotes a reference line passing through the center of the width direction (the x-axis direction of FIG. 5) of the door 200 in the height direction (the z-axis direction of FIG. 5) of the door 200. Based on the reference line C, the plurality of divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 may be symmetrically disposed. This is to maintain the left and right balance of the charged slab 10.

The divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 may have different widths. For example, as shown in FIG. 5, the divided door 204 in which the width E1 of one of the divided doors 202 disposed relatively close to the reference line C is far away from the reference line C. May be greater than the width E2. If the width of the divided door 202 is different, there is an advantage that can be applied to the slab 10 having a more wide width.

6 is a side view of the door.

5 and 6, the door 200 may include a door body 220, a blocking plate 230, an injection part 240, and an injection control height part 250.

The door body 220 serves to block the inlet 101 and the outlet 102 of the heating furnace 100.

The blocking plate 230 is disposed on the rear surface of the door body 220. Cooling water 231 is filled in the blocking plate 230 to prevent a predetermined temperature of the door body 220 from rising. The control unit 400 is connected to the supply module for supplying the cooling water 231, and measures the temperature inside the heating furnace 100, the temperature of the door body 220 is higher than the reference temperature of the door body 220 If deformation is expected, the coolant 231 may be supplied to the blocking plate 230.

The injection unit 240 is a device for injecting the flammable gas to the slab 10. When the injection part 240 injects combustible gas, a flame is generated. The injection unit 240 may be disposed below the blocking plate 230.

Injection control height unit 250 is a device for adjusting the position of the injection unit 240, adjusting the injection position of the combustible gas.

The sensor 260 may be disposed on the door body 220. The sensor 260 is a device that detects whether there is a slab 10 near the door 200.

7 is a view showing the back of the door.

1 and 7, the plurality of divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 may be separately disposed with a blocking plate 230, an injection control height 250, and an injection part 240. In addition, the driving unit 300 is also disposed in each of the divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 to implement independent movement of the divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211.

8 and 9 are views showing selective opening and closing of the divided doors corresponding to the width of the cast steel.

3, 4, and 8, when the slab 10 is charged into the heating furnace 100, the controller 400 corresponds to at least one of the plurality of divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210 and 211 corresponding to the width of the slab 10. One is selectively opened by the opening height h1. The width of the cast steel 10 may be input to the input unit 410 of the control unit 400 through the operator or the sensing unit 420.

When the slab 10 has a width of 3500 mm and the slab 10 having a relatively large width w1 is charged in the heating furnace 100 or extracted from the heating furnace 100, the slabs 10 are disposed at both ends of the door 200. All the divided doors 202, 203, 204, 205, 206, 207, 208, 209 and 210 except for the divided doors 206 and 211 may be moved up by the opening height h1. The width W1 of the cast steel 10A may correspond to the sum of the widths of the divided doors 202, 203, 204, 205, 206, 207, 208, 209, and 210 that are upwardly moved.

3 and 9, when the slab 10 has a width of 3000 mm and a slab 10B having a width smaller than that of the slab 10A of FIG. 8 is loaded, the controller 400 is configured to control the door 200. All the divided doors 202, 203, 204, 205, 206, 207, 208, 209, and 210 except for all four divided doors 206, 205, 210 and 211 disposed at both ends may be moved upward by the opening height h1. The width W2 of the cast steel 10B may correspond to the sum of the widths of the divided doors 204, 203, 202, 201, 207, 208, and 209 that are moved up and down.

In the case of FIG. 8, both side surfaces of the cast steel 10A are covered by divided doors 206 and 211 disposed at both ends of the door 200. In FIG. 9, both side surfaces of the cast steel 10B are covered by divided doors 206, 205, 210, and 211 disposed at both ends of the door 200. As such, when the door 200 is opened, the inlet 101 or the outlet 120 of the heating furnace 100 corresponds to the slab 10 having various widths based on the width direction of the heating furnace 100. The area exposed to the outside can be minimized.

10 is a view illustrating in detail the injection unit, Figure 11 is a view showing a unit nozzle of the injection unit.

7 and 10, the injection unit 240 may include a plurality of nozzles 241 and a gas supply unit 242 connected to the nozzles 241. The plurality of nozzles 241 are disposed downward. The plurality of nozzles 241 may be disposed at regular intervals in the width direction of the door 200. Combustible gas is injected through the nozzle 241. The gas supply unit 242 supplies the combustible gas to the nozzle 241. When the slab 10 is charged to the heating furnace 100, the control unit 400 is sprayed flammable gas toward the slab 10 to be charged is a nozzle 241 disposed in the divided doors 201,202,203,204,205,206,207,208,209,210,211 opened. The nozzles 241 disposed in the divided doors 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, and 211 that are not open do not operate.

When the combustible gas is injected, a flame is generated, and the generated flame thermally blocks the inside and the outside of the heating furnace 100 like a curtain, and when the door 200 is opened, the heat inside the heating furnace 100 is lost. It is prevented from being lost or being exposed to the atmosphere gas inside the furnace 100. In addition, by the injected flammable gas, the scale may be removed by being disposed on the upper surface of the cast steel 10. Meanwhile, a roller 232 for guiding the slab 10 may be disposed below the blocking plate 230.

7 and 11, each nozzle 421 may include a plurality of unit nozzles 421a. Some of the unit nozzles 421a may be disposed to be inclined toward the front F or the rear R of the door 200. Therefore, a flame is generated along the charging direction or the extraction direction of the cast steel 10. As a result, the flame generating region is widened in the charging direction or the extraction direction of the cast steel 10, thereby preventing the loss of heat inside the heating furnace 100 more effectively.

In particular, the injection unit 240 is arranged to tilt toward the front (F) or rear (R) of the door 200, thereby further widening the flame generating region in the charging direction or extraction direction of the cast steel 10, thereby heating The loss of heat in the furnace 100 can be prevented more effectively. Specific configuration of the injection unit 240 for this is as follows. The injection part 240 includes the injection height adjusting part 250. In this case, the injection unit 240 may be rotatably coupled to the lower end of the blocking plate 230. The injection height adjusting unit 250 is connected to the blocking plate 230 and the injection unit 240. The injection height adjusting unit 250 may include a cylinder whose length is extended and contractable. The injection unit 240 in which the unit nozzle 421a is disposed performs a tilting movement around the hinge axis P in response to the expansion and contraction of the injection height adjusting unit 250.

Here, the injection height adjustment unit 250 may adjust the injection height (h2) according to the control signal of the control unit 400. The injection height h2 means the vertical distance from the upper surface to the unit nozzle 421a in the slab 10. Each unit nozzle 421a may have a different injection height h2. When the opening height h1 considering the thickness t of the slab 10 is input, the controller 400 may control the injection height adjusting unit 250 to maintain the injection height h2 corresponding thereto. Therefore, in consideration of the opening height h1 of the door 200, since the flame is generated through the injection unit 240, heat loss in the heating furnace 100 is more effectively corresponding to various kinds of the slabs 10. There is an advantage that can be prevented.

The heating apparatus according to the preferred embodiment of the present invention has been described in detail with reference to the accompanying drawings.

One embodiment of the invention described above is intended to be illustrative in all respects and not to be limiting, the scope of the invention will be indicated by the claims to be described below rather than the foregoing detailed description. And it is to be construed that all changes or modifications derived from the equivalent concept as well as the meaning and scope of the claims are included in the scope of the present invention.

10: cast
100: heating furnace
101: entrance
102: exit
200: door
220: door body
230: blocking plate
240: injection unit
300: drive unit
400: control unit

Claims (10)

A heating furnace for heating the cast steel;
A door disposed in the heating furnace;
A drive unit connected to the door; and
A control unit connected to the driving unit to control movement of the door;
The control unit, when opening the door, adjusts the opening height of the door corresponding to the thickness of the cast steel,
The door is arranged in the width direction of the door, and, when the door is opened, includes a spraying portion for injecting combustible gas to the upper surface of the cast steel,
The spraying unit includes a plurality of nozzles arranged in the width direction of the door, each of the nozzles includes a plurality of unit nozzles, and at least one of the plurality of unit nozzles is disposed to be inclined toward the front or the rear of the door. Become,
The door is a heating furnace apparatus comprising a door body, a blocking plate disposed behind the door body and includes a coolant, and an injection height adjusting unit for connecting the blocking plate and the spraying unit to adjust the spraying height of the spraying unit. . The method of claim 1,
And the open height is within 1.5 to 2 times the thickness of the cast steel. The method of claim 1,
The door includes a plurality of divided doors disposed along the width direction of the door,
The control unit, when the door is opened, in response to the width of the slab, a plurality of the divided doors to open the furnace by the opening height selectively. The method of claim 3, wherein
A plurality of the divided doors are arranged symmetrically with respect to the reference line passing through the center of the width direction of the door. The method of claim 4, wherein
The divided door disposed on one side of the reference line and opened by the opening height, and the divided door disposed on the other side of the reference line and opened by the opening height, are disposed symmetrically with respect to the reference line. Into the device. The method of claim 3, wherein
A heating furnace apparatus, wherein a width of at least one of the plurality of divided doors is different from that of other divided doors. delete delete delete The method of claim 1,
The control unit is connected to the injection height control unit, the heating apparatus for adjusting the injection height corresponding to the opening height.

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