KR101406540B1 - Apparatus for buffering electric furnace's explosion - Google Patents

Abstract

The present invention includes an explosion buffer installed in an opening of the furnace body to buffer an internal combustion explosion of the furnace and an opening formed in an upper portion of the furnace body to prevent breakage of the furnace, A lead member connected to the upper portion of the furnace body by a hinge member and seated in an opening of the furnace body so as to cool the explosion pressure inside the furnace and a cooling member connected to the inside of the lid member for cooling the lid member, According to the present invention, when an internal explosion of a furnace occurs due to various causes, the internal explosion pressure of the furnace is lowered by automatic opening and closing of the furnace to prevent breakage of the furnace, In addition, it is possible to prevent workers from safety accidents by preventing leakage of high-temperature and high- And.

Description

[0001] Apparatus for buffering electric furnace ' s explosion [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal explosion damping device for a furnace, and more particularly, to an internal explosion damping device for a furnace which reduces a pressure generated when an internal explosion of a furnace is extinguished.

In a mill mill of a steel mill in general, molten steel is melted in an electric furnace to produce molten steel. The produced molten steel is taken to a ladle through a ladle and transferred to a subsequent process.

At this time, the ladle of the electric furnace is filled with sand to prevent the molten steel from flowing out, and when the melting operation is completed, the sand is removed to open the molten steel.

An example of such an electric furnace is shown in Fig. 1, an electric furnace 1 includes a furnace body 2 composed of a refractory to contain molten steel therein, and a roof 3 which is a cover which is openably and closably connected to the top of the furnace body 2. As shown in Fig.

The upper electrode bar 5 is inserted into the furnace body 2 through the loop 3 and the lower electrode 6 is mounted on the lower support frame 4 of the furnace body 2. [

An opening 8 (not shown) called EBT (Eccentric Bottom Tap) is protruded from one side of the furnace body 2, and an opener (not shown) is provided at the lower end of the opening 8. In the opening 8, Sand (not shown) introduced from the sand inlet 7 is filled.

In the electric furnace 1 constructed as above, when the molten steel operation is completed, the opener (not shown) that closes the lower end of the louver 8 is opened to discharge the sand and then the louver 8 is opened, And the molten steel is led through the sphere 8a and loaded on the lower ladle (not shown) to complete the molten steel production work.

However, explosion may occur in the furnace due to water expansion due to leakage of cooling water from inside the furnace during the production of molten steel through the electric furnace 1, collapse of unheated or large scrap metal, and the like.

At this time, due to the internal explosion pressure of the furnace, the slag discharge port (not shown) or the discharge port 8 disposed at the lower end of the electric furnace, which is a comparatively weak part, is broken and opened and the molten steel is discharged to the work site, A safety accident occurs. In addition, the electric furnace 1 itself may be damaged due to a sudden explosion.

The present invention has been proposed in order to overcome the above-mentioned problems of the prior art. When internal explosion of the furnace occurs due to various causes, the internal explosion pressure of the furnace is lowered by automatic opening and closing of the furnace to prevent breakage of the furnace, And to prevent a safety accident of a worker from being blocked by leakage of high-temperature and high-temperature charged materials into the discharge port or the molten steel discharge port.

In order to achieve the above object, an embodiment of the present invention provides the following internal explosion shock absorber.

In one embodiment of the present invention, an explosion buffer is provided in an opening of the furnace body so as to buffer an opening formed in an upper portion of the furnace body and an internal explosion of the furnace to suppress breakage of the furnace, A lead member connected to the upper portion of the furnace body by a hinge member and seated in an opening of the furnace body so as to cool the lead member and connected to the inside of the lead member so as to reduce the explosion pressure in the furnace, And cooling means installed thereon.

In one embodiment, the cooling means includes a cooling water flow path staggered in the lead member, a heat exchanger connected to the cooling water flow path, for recovering heat from the cooling water passing through the cooling water flow path, and a heat exchanger connected to the heat exchanger, A cooler for cooling the coolant having passed through the heat exchanger to a reference temperature and a coolant supply unit connected between the cooler and the coolant channel and supplying the coolant having passed through the cooler to the coolant channel.

In one embodiment, the explosion buffer may further include a refractory member provided on a side of the lead member facing the opening, so as to prevent the lead member from being eroded by the contents in the furnace.

In one embodiment, the explosion buffer may further include locking means connected to the lead member and installed on the furnace body so as to prevent the opening of the lead member.

In one embodiment, the locking means includes a lock block disposed on a moving groove formed in the lead member, and a hydraulic cylinder disposed on an upper portion of the lock body to push the lock block into an insertion groove formed on one side of the opening portion. . ≪ / RTI >

In one embodiment, the locking means may further include an elastic member disposed between one side of the moving groove and the step portion of the locking block, and providing a restoring force to restore the locking block when the push bar is retracted.

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An internal explosion shock absorber according to the present invention is an internal explosion shock absorber according to the present invention, in which, when internal explosion of the furnace occurs due to various reasons such as water expansion due to leakage of cooling water, disintegration of now- The internal explosion pressure of the furnace is lowered by the automatic opening and closing of the member, so that breakage of the furnace can be suppressed.

In addition, when the internal explosion of the furnace is initiated, the slag discharge port or the molten steel discharge port is opened by the explosion pressure, and the charge in the furnace flows out to prevent a safety accident that may occur to an operator such as burns or death.

1 is a state diagram showing an internal explosion state of a conventional electric furnace.
FIG. 2 is a schematic perspective view showing an explosion buffer of an embodiment according to the present invention. FIG.
Fig. 3 is a conceptual diagram showing a cooling means of an embodiment according to the present invention.
4A is a side cross-sectional view illustrating an embodiment according to the present invention.
4B is a side cross-sectional view of another embodiment in which a refractory member is added to the invention shown in Fig. 4A.
4C is a side cross-sectional view of another embodiment with the locking means added to the invention shown in FIG. 4A.
FIG. 4D is a side cross-sectional view of the state in which the locking means of the invention shown in FIG.
Figure 4e is a partial plan view of the invention shown in Figure 4c.
Fig. 5A is an operational state view showing a state in which the lead member is cooled from a high temperature and a high temperature inside the electric furnace in the invention shown in Fig. 4A.
Fig. 5B is an operational state diagram showing a state in which the rib member is opened and the electric furnace internal pressure is lowered due to the high pressure inside the electric furnace in the invention shown in Fig. 4A.

In order to facilitate understanding of the features of the present invention as described above, the internal explosion shock absorber according to the embodiment of the present invention will be described in more detail.

In order to facilitate understanding of the embodiments described below, in the reference numerals shown in the accompanying drawings, the related components among the components that perform the same function in the respective embodiments are denoted by the same or an extension line number.

The embodiments related to the present invention basically prevent the breakdown of the furnace by lowering the internal explosion pressure of the furnace through automatic opening and closing of the furnace when internal explosion of the furnace occurs due to various causes, It is based on the ability to prevent workers from accidental accidents by blocking the leakage of high-temperature and high-temperature water.

Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a schematic perspective view showing an explosion buffering portion of an embodiment of the present invention, and FIG. 3 is a conceptual view showing a cooling means of an embodiment according to the present invention. 4A is a side sectional view showing an embodiment according to the present invention, FIG. 4B is a side sectional view of another embodiment in which a refractory member is added to the invention shown in FIG. 4A, FIG. 4D is a side cross-sectional view of the inventive locking means shown in FIG. 4C, and FIG. 4E is a partial plan view of the invention shown in FIG. 4C. 5A is an operational state view showing a state in which the lead member is cooled from a high temperature and a high temperature inside the electric furnace in the invention shown in FIG. 4A. FIG. And the member is opened and the electric furnace internal pressure is lowered.

Referring to Figs. 2 to 5A, the configuration of an embodiment of the internal explosion damping device of the present invention, which is the present invention, includes an opening 28 formed in the upper portion of the furnace body 20 and the internal explosion of the furnace, And an explosion buffer 30 installed in the opening 28 of the furnace body 20.

The furnace body 20 may be an electric furnace disposed in a steel making facility and provided to produce molten steel. Generally, the electric furnace has an internal space 21 for charging a charge such as scrap, which is a raw material of molten steel, and an upper electrode 22 and an upper electrode 24 are provided on the upper loop 22 and the lower support frame 23 of the internal space 21, The lower electrode 25 is positioned to dissolve the charge through electric power.

A slag discharge port (not shown) is disposed at a lower side of the electric furnace to discharge the slag generated after the completion of the work. A sand inlet 26 and a molten steel discharge port 27 are disposed on the other side, It is provided to be discharged to a transfer car.

Of course, the furnace body 20 is not necessarily limited to an electric furnace, and may be applied to other types of furnaces as long as the explosion buffer 30 can be installed.

Next, the explosion buffer 30 may be configured to include the lead member 40, the hinge member 50, and the cooling means 60 as shown in FIG. 4A. The lead member 40 is opened or closed when an explosion occurs in the furnace and is connected to the upper portion of the furnace body 20 by the hinge member 50 so as to relieve the explosion pressure inside the furnace, To be seated in an opening 28 in which at least one is formed.

The lead member 40 is formed in a circumferential direction of the body portion 41 and the body portion 41 and is connected to the extension portion 45 protruding in the direction of the opening portion 28 and to the hinge member 50 And a connecting portion 43 which is formed of a metal plate.

The hinge member 50 includes a hinge block 53 fixed to the upper portion of the furnace body 20 and connected to the connecting portion 43 of the lid member 40 mounted on the hinge block 53, And a hinge shaft 51 provided to rotate the member 40.

Referring to FIG. 5B, when an explosion occurs inside the furnace, the internal pressure of the furnace will be increased due to the explosion, and if the lead member 40 is not present, The discharge port or the molten steel discharge port is broken.

Accordingly, due to the presence of the lead member 40, the internal pressure A of the furnace increased due to the explosion is discharged through the lead member 40 which is relatively easy to open than the slag discharge port or the molten steel discharge port. At this time, the lead member 40 will be automatically opened by the internal pressure of the furnace.

Since the lead member 40 is connected by the hinge member 50, when the inner pressure of the furnace is lowered again, the lead member 40 moves down toward the opening 28 and automatically closes the opening 28.

In FIG. 2, two openings 28 are formed, so that the number of the lead members 40 is two. The lead member 40 may have a shape corresponding to the opening 28 so that the lead member 40 has a circular cross section when the opening 28 has a circular cross section.

The cooling means (60) is connected to one side of the upper portion of the rib member. The cooling unit 60 may include a cooling water flow path 61, a heat exchanger 62, a cooler 63, and a cooling water supply unit 65.

The cooling water flow path 61 may be arranged in the zigzag direction within the lead member 40. The cooling water flowing into the cooling water flow path 61 may cool the lead member 40 as a whole .

Referring to FIG. 5A, it can be seen that the high temperature, high temperature B inside the furnace reaches the lower side of the lead member 40 through the opening 28 and the lead member 40 is heated. At this time, the lead member 40 is cooled by the cooling water passing through the cooling water flow path 61, thereby preventing heat loss of the lead member 40.

The cooling water flowing through the interior of the lead member 40 flows into the heat exchanger 62 connected to the cooling water flow path 61. The heat exchanger 62 serves to collect the heat obtained from the high-temperature and high-temperature charge in the furnace while the cooling water flows through the cooling water flow path 61.

3, the heat exchanger 62 is connected to a general Rankine cycle (power generation section 90) composed of a turbine 91, a condenser 93 and a pump 95, and is connected to the turbine 91 on the Rankine cycle It can be seen that the heat recovered from the cooling water is used for power generation. The operation principle of the Rankine cycle is already known, so the explanation is omitted.

Then, the cooling water having passed through the heat exchanger (62) is moved to the cooler (63). The cooler 63 may be provided with a temperature measuring sensor and stops the operation of the cooler 63 when the coolant having passed through the heat exchanger 62 is lower than a preset coolant temperature, May be provided to operate the cooler 63 when the coolant having passed through the cooler 63 is higher than a predetermined coolant temperature.

That is, the cooler 63 does not operate when the temperature of the coolant is sufficiently lowered through the heat exchanger 62, but the temperature of the coolant having passed through the heat exchanger 62 cools the lead member 40 It will only work if it is higher than the reference cooling temperature.

The cooling water having passed through the cooler 63 is moved to the cooling water supply unit 65 connected to the cooler 63 and recirculated again to cool the lead member 40.

If the flow rate of the cooling water is insufficient, additional cooling water may be supplied from the water supply tank 67. If the flow rate of the cooling water is excessive, the cooling water may be discharged to the outside through the drain valve 68. [

The explosion buffer 30 may further include a refractory member 70 installed on a side of the rib member facing the opening 28, as shown in FIG. 4B. The refractory member 70 may be disposed and stacked corresponding to the shape of the opening 28 at a lower portion of the lead member 40.

The refractory member 70 may be a general refractory material used in an electric furnace and it is preferable that the lead member 40 is eroded when a part of the molten steel is sprung to contact the lower surface of the lead member 40 when an internal explosion of the furnace occurs, .

4C to 4E, when the lead member 40 is not in use, the explosion buffering portion 30 may be formed in the shape of a cylinder, And a locking means (80) connected to the upper portion of the furnace body (20).

The locking means 80 includes a lock block 81, a moving groove 82, an insertion groove 83, a hydraulic cylinder 84, a push bar 85, a housing 89 and a second cooling water passage 89a. As shown in FIG.

The lead member 40 may be formed in the extension groove 45 in the movement groove 82. The locking block 81 may be disposed on the moving groove 82, and the locking block 81 may have a T-shaped cross section.

The insertion groove 83 may be formed at a side of the opening 28 facing the movement groove 82 and a part of the locking block 81 may be inserted into the insertion groove 83, (40) is prevented from being opened.

Also, the hydraulic cylinder 84 may be disposed on an extension of the moving groove 82 at an upper portion of the furnace body 20. The push bar 85 may be connected to the end of the rod 84a of the hydraulic cylinder 84 in a flanged manner and the push bar 85 may be connected to the moving groove 82 by the operation of the hydraulic cylinder 84. [ And the locking block 81 is pushed into the insertion groove 83.

In order to prevent the hydraulic cylinder 84 from being heated due to the high temperature and high temperature inside the furnace, the hydraulic cylinder 84 may include a housing (not shown) having the second cooling water passage 89a formed in a spiral shape 89).

In this case, the cooling water flows along the second cooling water passage 89a arranged in the circumferential direction of the hydraulic cylinder 84 in the housing 89 to cool the hydraulic cylinder 84 to be heated from high temperature and high temperature .

Meanwhile, the locking means 80 may further include an elastic member 87 to restore the locking block 81 when the push bar 85 is retracted. The elastic member 87 may be disposed between one side of the moving groove 82 and the step portion 81a of the lock block 81. [

When the push bar 85 is moved forward in accordance with the operation of the hydraulic cylinder 84, the elastic member 87 is urged by the push block 85 to move the lock block 81 and the moving groove 82 When the push bar 85 is retracted, it is supported on one side of the moving groove 82 and the locking block 81 is pushed toward the other side of the moving groove 82. That is, the elastic member 87, which may be implemented as a coil spring, disc spring, or the like, provides restoring force to the locking block 81.

 The present invention has the above-described constitution and operating state, and when the internal explosion of the furnace occurs due to various causes, the internal explosion pressure of the furnace is lowered by automatic opening and closing of the furnace to prevent breakage of the furnace, It is possible to prevent the safety accident of the worker by preventing the high temperature and high heat contents from leaking to the lubrication port.

The above description is only a specific example of the internal explosion shock absorber of the furnace.

Therefore, it should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. do.

20 ... furnace body 28 ... opening
30 ... explosion buffer section 40 ... lead member
45 ... extension portion 50 ... hinge member
51 ... hinge shaft 53 ... hinge block
60 ... cooling means 61 ... cooling water flow path
62 ... heat exchanger 63 ... cooler
65 ... Cooling water supply part 67 ... Water supply tank
70 ... refractory member 80 ... locking means
81 ... lock block 82 ... movement groove
83 ... insertion groove 84 ... hydraulic cylinder
85 ... push bar 87 ... elastic member
89 ... housing 89a ... second cooling water flow path

Claims (7)

delete An opening formed in an upper portion of the furnace body;
And an explosion buffer installed in an opening of the furnace body so as to buffer an internal explosion of the furnace to suppress breakage of the furnace,
The explosion-
A lead member connected to the upper portion of the furnace body by a hinge member and seated in an opening of the furnace body so as to open or close the furnace when an explosion occurs in the furnace; And
A cooling means connected to the inside of the lead member so as to cool the lead member;
Wherein the internal explosion shock absorber comprises an internal explosion shock absorber.
3. The method of claim 2,
Wherein the cooling means comprises:
A cooling water flow path provided staggered inside the lead member;
A heat exchanger connected to the cooling water channel and recovering heat from the cooling water passing through the cooling water channel;
A cooler connected to the heat exchanger and cooling the cooling water passing through the heat exchanger to a reference temperature; And
A cooling water supply unit connected between the cooler and the cooling water channel, for supplying cooling water having passed through the cooling unit to the cooling water channel;
Wherein the internal explosion damping device comprises:
3. The method of claim 2,
Wherein the explosion buffer further comprises a refractory member provided on a side of the lead member facing the opening so as to prevent the lead member from being eroded by the charge inside the furnace. .
5. The method according to any one of claims 2 to 4,
Wherein the explosion buffer further comprises a locking means connected to the lead member and installed on an upper portion of the furnace body so as to prevent the opening of the lead member.
6. The method of claim 5,
Wherein the locking means comprises:
A locking block disposed on a moving groove formed in the lead member; And
A hydraulic cylinder disposed at an upper portion of the furnace body to push the locking block into an insertion groove formed at one side of the opening;
Wherein the internal explosion damping device comprises:
The method according to claim 6,
Wherein the locking means further comprises an elastic member which is disposed between one side of the moving groove and the step portion of the locking block and provides a restoring force to restore the locking block when the push bar is retracted. Device.

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