JP2005232552A - Support structure for hot metal flume - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure for a hot metal flume, which reduces an operation for repairing a junction between the hot metal flume and a main flume, and besides, prevents a trouble of leaking hot metal in the junction between the hot metal flume and the main flume, during using the flumes. <P>SOLUTION: The hot metal flume has a main body of the flume comprising a flume material having a hot metal passage formed therein and a flume frame surrounding the flume material; is mounted on a structure fixed on the ground, in a state of being connected to the main flume through the junction; and has a spring arranged between a spring carrier member installed on the flume frame of the hot metal flume and a carrier bar fixed on the ground, to form a structure capable of following the thermal expansion and shrinkage of the main flume. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot metal support structure capable of following thermal expansion and contraction of a main furnace of a blast furnace.

  In the blast furnace, a method is adopted in which hot metal and slag are discharged simultaneously from the tapping hole and the hot metal and slag are separated by a dam provided in the main pole. In order to flow the separated hot metal to a predetermined position, the hot metal is connected to the main iron via a connecting portion. These blast furnace soots are used at the time of tapping, and are required to have a structure in which leakage does not easily occur and to have excellent durability.

  As the structure of the main body consisting of the firewood and the firewood frame surrounding the firewood, there is a blast furnace fired with a high-density panel block lined in order to extend the life of the firewood that is eroded by both hot metal and slag. Known (Patent Document 1).

On the other hand, in the structure of the hot metal of the blast furnace, the main body, like the main iron, is made up of a hot metal in which a hot metal passage is formed and a hot metal frame surrounding the hot metal. Since these hot metal flows hot metal and slag that reach 1500 ° C at the time of brewing, large thermal expansion and contraction occurs during use and at rest, so it is only placed on the structure that supports the cast floor. The support structure is not supported in the horizontal direction, and thus has the following problems.
JP 59-185710 A

  Problems in the blast furnace hot metal support structure will be explained with reference to Figs. 10-1 to 10-6.

  FIGS. 10-1 to 10-6 are schematic views showing the state of the hot metal 2 in each process in a cross-sectional view in which the longitudinal direction of the hot metal is cut vertically, and a connecting portion between the main iron 1 and the hot metal 2 The positional relationship of the nearby brazing material is shown. The connecting portion is arranged such that one end portion of the main iron 1 and one end portion of the hot metal 2 are overlapped with a space in the vertical direction, between the main iron 1 and the hot metal 2 spaced apart, and in the longitudinal direction of the iron A stamp material 3A, which is a refractory material, is formed between the brazing material 2A of the hot metal 2 and the brazing material 1A of the main rod 1 at the time of construction (see FIG. 10-1).

  The stamp material 3A constituting the connecting portion uses a refractory material that can absorb elongation compared to the brazing materials 1A and 2A. However, since the thermal expansion amount of the main rod 1 exceeds that, the main rod is used when the rod is used. 1, the hot metal 2 is pushed in the longitudinal direction of the punch through the stamp material 3A, and moves in the longitudinal direction of the punch by an amount indicated by a in FIG. After that, when the rod is stopped, the main rod 1 is gradually cooled and the end surface 4 of the main rod 1 on the side of the anti-reactor body is changed as the main rod 1 contracts in the longitudinal direction. Is placed on a structure that supports a cast floor or the like, and therefore moves following the contraction of the main shaft 1 unless it receives a force greater than the maximum frictional force F represented by the following formula (1). There is no.

Maximum frictional force F acting between the hot metal frame and the structure on which the hot metal is placed F = mass of hot metal M × coefficient of friction μ between the hot metal frame and the structure on which the hot metal is placed (1)
However, the bonding force between the brazing material 1A of the main rod 1 and the stamping material 3A is not so great.

  For this reason, when the main rod 1 is put on the stamp material 3A of the hot metal 2, when the main rod 1 contracts in the longitudinal direction, the hot metal 2 is made to follow the main rod 1 in the furnace body direction. Cannot be moved, and a crack occurs in the connecting portion connected to the main rod 1 via the stamp material 3A, and a gap b is formed as shown in FIG. 10-3.

  Accordingly, as shown in FIG. 10-4, it is necessary to repair the ridge that fills the gap b with the additional stamp material 3B, and the refractory cost and maintenance cost of the additional stamp material and the like are increased. If repairing the rod without filling the gap b and restarting the rod, it will lead to a leakage trouble in which the molten iron leaks from the gap b formed in the joint between the main rod and the molten iron. In order to prevent leakage that leads to such a serious disaster, repair work for the soot that fills the gap b is essential. After repairing the scissors and restarting, the hot metal 2 is pushed by the main scissors 1 through the stamp material 3A and the additional stamp material 3B in the scissors longitudinal direction, as shown in FIG. As a result of the movement of a 'and then, when the hot metal is stopped, the hot metal 2 cannot be pulled back in the longitudinal direction of the hot metal by a' along the main iron 1 for the reason described above. A repair work for the heel is performed in which the gap formed corresponding to the heel longitudinal movement amount a ′ is filled with the additional stamp material 3B. When such scissors repair and re-use of scissors are repeated, the amount of movement of the scissors 2 in the longitudinal direction of the scissors 2 increases every time the scissors are repaired. The state where the two overlaps disappear. When such a state is reached, it is necessary to perform a large-scale repair work in which the iron stamp plate is applied to both side surfaces and the bottom surface and the additional stamp material 3B is constructed between the main rod 1 and the hot metal 2. In FIGS. 10-1 to 10-6, reference numeral 20 denotes a dam that separates the hot metal from the slag.

  The present invention solves the above-mentioned problems, can reduce the repair work of the connecting portion between the main metal and the hot metal, and, when using the iron, the leakage trouble that the hot metal leaks at the connecting portion between the main metal and the hot metal. It is an object of the present invention to provide a hot metal support structure capable of preventing the above.

The present invention is as follows.
1. A hot metal support structure for supporting hot metal connected to the main rod of a blast furnace, wherein the hot metal has a hot metal body formed of a hot metal having a hot metal passage formed therein and a hot metal frame surrounding the hot metal material, A spring is disposed between a spring receiving member attached to the hot metal frame and a fixed member fixed to the ground, and is mounted on a structure fixed to the ground while being connected to the main rod. The hot metal support structure is configured to be able to follow the thermal expansion and contraction of the main rod.
2. A plurality of rollers are disposed between the hot metal and a structure on which the hot metal is placed. The hot metal support structure described in 1.

  According to the present invention, it is possible to reduce the repair work of the connecting portion between the main metal and the hot metal, and it is possible to reduce the refractory cost such as the additional stamp material and the maintenance cost. Moreover, according to the present invention, it is possible to prevent a leakage trouble that the molten iron leaks at the connecting portion between the main metal and the hot metal during the operation of the hot metal.

  First, the hot metal support structure according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic plan view for explaining the principle of the support structure for the hot metal 2 according to the present invention, and FIG. 2 is a schematic side view of the support structure for the hot metal 2 shown in FIG. 3 is a cross-sectional view taken along line XX in FIG. 1 and 2, the dams provided on the main rod 1 and the structure of the connecting portion 3 of the slag rod and the hot metal 2 for transporting the separated slag to a predetermined position are the same as in the prior art. Omitted.

  As in the prior art, the hot metal 2 used in the present invention is connected to the main iron 1 via the connecting portion 3 and carries the hot metal separated from the slag to a predetermined position to flow down from the open end. The cocoon body is composed of the cocoon material 2A and the cocoon frame 2B that surrounds the cocoon material 2A.

  As shown in FIG. 4, the main rod 1 is also composed of a rod 1 </ b> A having a passage for flowing molten iron and slag and a rod frame 1 </ b> B surrounding the rod 1 </ b> A. 1C, red brick 1D and castable 1E are housed in main frame 1F.

  The structure is composed of a gutter receiving beam 51, a horizontal beam 52, a vertical support beam 53 fixed to the ground, and the like. An H-section steel is preferably used for the structural member.

  Here, on the furnace body side of the main rod 1, the movement of the blast furnace in the direction of the blast furnace body is restricted by the furnace body of the blast furnace, while the hot metal 2 is placed on the bridge receiving beam 51 of the structure. . The longitudinal direction of the main rod 1 is toward the center of the blast furnace body (see FIG. 5). In addition, the hot metal 2 shown in FIGS. 1 to 3 has a longitudinal direction toward the center of the furnace body of the blast furnace, but there is a refracting part between the opening ends, and as shown in FIG. There is also a hot metal in which the longitudinal direction of the hot metal 2 is not directed toward the furnace body center of the blast furnace in the direction beyond the section.

The hot metal 2 supporting structure according to the present invention has a spring between a spring receiving member 6, 6 ′ attached to the hot metal frame 2 </ b> B of the hot metal 2 and a receiving column 7, 7 ′ which is a fixed member fixed to the ground. 8 is arranged. In order to enable the hot metal 2 to follow the thermal expansion and contraction of the main rod 1 by the spring 8 disposed between the spring receiving members 6 and 6 ′ and the receiving columns 7 and 7 ′, as follows. It is important to.
(i) The number of springs 8 and the spring coefficient are the maximum frictional force F expressed by the above formula (1), where the total spring force is the sum of the spring forces generated by the deflection of the two springs 8 when the scissors are used. Decide to exceed. In addition, when the scissors are used, the springs 8 arranged as shown in FIGS. 1 and 2 are pulled by the spring receiving members 6 and 6 ′, and the deflection of the springs 8 increases due to the state before using the scissors. Therefore, the total spring force generated by the deflection of the two springs 8 needs to exceed the maximum frictional force F expressed by the equation (1).

The reason for this is that when the rod is used, the total spring force generated by the deflection of the two springs 8 is less than the maximum frictional force F. It is because the case where the hot metal 2 cannot be followed occurs. The direction of the maximum frictional force F when the main rod 1 contracts in the longitudinal direction works in the direction of the reactor body indicated by the arrow 11.
(ii) The spring 8 has its length direction aligned with the longitudinal direction of the main rod 1 and the springs 8 having the same spring coefficient are arranged on both sides of the hot metal 2. In this way, a bending moment is prevented from being generated in the connecting portion 3 with the main rod 1 due to the spring force generated by the deflection of each spring 8.

  In the hot metal 2 having such a support structure, the main body of the hot metal 2A formed with the hot metal passage and the hot metal frame 2B that surrounds the hot metal 2A is connected to the main iron 1 via the connecting portion 3. A spring receiving member 6, 6 ′ which is mounted on the structure 51 fixed to the ground in a state and attached to the flame frame 2 B of the hot metal 2 and a receiving column 7, 7 which is a fixed member fixed to the ground. A spring 8 is arranged between the main rod 1 and the main rod 1 so as to follow the thermal expansion and contraction.

  The operation of the above-described support structure for the hot metal 2 according to the present invention will be described. Since the hot metal 2 extends in the longitudinal direction due to thermal expansion of the main metal 1 during operation of the hot metal, the hot metal 2 is connected via the connecting portion 3. As a result, it moves in the direction indicated by the arrow 11. On the other hand, after the firewood is used, when the firewood is stopped, the main firewood 1 is gradually cooled, and the main firewood 1 contracts in the longitudinal direction, so that the end surface 4 of the main firewood 1 changes to the furnace body side. At the time, when the rod is used, the total spring force of the two springs 8 is greater than the maximum frictional force F expressed by the equation (1), so that it follows the transition of the end face 4 of the main rod 1. Thus, the hot metal 2 can be moved in the direction indicated by the arrow 12.

  Therefore, in the supporting structure of the hot metal 2 according to the present invention, when the main iron 1 contracts in the longitudinal direction, the hot metal 2 is moved in the furnace body direction indicated by the arrow 12 by following the transition of the end surface 4 of the main iron 1. It can be moved and it can prevent that a clearance gap arises in the connection part connected with the main fence 1. FIG. As a result, it is possible to reduce the repair work of the connecting portion with the main board, and it is possible to reduce the refractory cost such as the additional stamp material and the maintenance cost.

  Moreover, in the support structure of the hot metal 2 according to the present invention, after using the hot metal, the hot metal 2 is moved in the furnace body direction indicated by the arrow 12 by following the transition of the end surface 4 of the main iron 1 when the hot metal is stopped. Since it is possible to suppress the occurrence of cracks in the connecting portion connected to the main rod 1 via the stamp material 3A, the hot metal leaks from the connecting portion 3 of the hot metal 2 when the iron is used. Leakage trouble can be prevented.

  By the way, in the support structure of the hot metal 2 according to the present invention, the plurality of rollers 9 are arranged between the hot metal 2 and the structure 51 on which the hot metal 2 is placed. This is preferable because the friction coefficient μ between the structure 51 on which the frame 2B and the hot metal 2 are placed can be reduced and the maximum frictional force F expressed by the equation (1) can be reduced. For the same purpose, a material capable of reducing the friction coefficient μ such as stainless steel or resin may be disposed on the upper surface of the eaves receiving beam 51.

  In addition, each spring is provided with a cooling structure such as a cooling fan in order to mitigate the thermal effects during use of the eaves, so that when the eaves are used, the temperature rise of each spring can be suppressed. Since the fall of the spring coefficient of a spring can be made small, it is preferable. Any type of spring can be used as long as it has a necessary spring constant such as a coil spring or a leaf spring.

In the casting floor of a blast furnace with a furnace internal volume of 5150 m ^3, the hot metal support structure according to the present invention is connected to the main iron 101 as shown in FIG. 5 via the connecting portion 103, and the separated hot metal is brought to a predetermined position. It was applied to the hot metal 102 that was carried and flowed down from the open end 104. At that time, in order to prevent an excessive bending force from acting on the refracting part between the hot metal 102-1 and 102-2 and the refracting part between the hot metal 102-2 and 102-3, Each time, a spring 108 was installed as shown in FIGS. 6-1, 6-2, and 6-3. Second, the same number of springs 108 having the same spring coefficient are installed on both sides of the hot metal passage.

  However, the springs 108 are fixed to the grounds 107 and 107 so that the total spring force generated by the deflection of the springs 8 exceeds the maximum frictional force F expressed by the equation (1) when the saddle is used. A total of 16 pieces were installed between 'and hot metal 102.

 The breakdown of the locations where the springs 108 are installed is that the hot metal 102-1 is 4 locations, the 102-2 is 8 locations, and the 102-3 is 4 locations. In FIG. 5, α indicates the inclination angle of the hot metal 102-2 from the x-axis, and β indicates the inclination angle of the hot metal 102-3 from the x-axis. The xy axis is an orthogonal coordinate axis with the furnace center 100A of the furnace body 100 of the blast furnace as the origin.

  Here, in FIG. 6-1, FIG. 6-2 and FIG. 6-3, a set of springs installed across the hot metal passages of the hot metal parts 102-1, 102-2 and 102-3 of the hot metal 102. 108 is shown, but the spring 8 is arranged in the same manner for the other springs with the spring length direction aligned with the longitudinal direction of the main rod 1. Each set of springs 108 is installed between a spring receiving member 106, one of which is attached to the side surface of the collar frame 102B, and a receiving column 107 fixed to the ground, and the other is attached to the side surface of the opposite collar frame 102B. Between the spring receiving member 106 ′ and the receiving column 107 ′ fixed to the ground.

  The number and the spring force of the springs 108 to be installed in each hot metal part of the hot metal are as follows, assuming that the friction coefficient μ between the hot metal frame and the structure on which the hot metal is placed is 0.6, taking into consideration the safety factor: I decided so.

Force required to pull back hot metal 102-1 = 13.0 ton / m × 5.5 m × 0.6 = 43 ton
Force required to pull back hot metal 102-2 = 13.0 ton / m × 11.5 m × 0.6 = 90 ton
Force required to pull back hot metal 102-3 = 13.0 ton / m × 4.8 m × 0.6 = 38 ton
The hot metal 102 is composed of 102-1, 102-2 and 102-3, and the total length from the connecting portion 103 to the open end 104 is 21.8 m. The length of the hot metal 102 is a distance measured with respect to the center of the width of the hot metal passage formed in the hot metal for flowing the hot metal, and the length of the hot metal 102-1 is 5.5 m. The length of 2 is 11.5 m, and the length of the hot metal 102-3 is 4.8 m. Moreover, the mass of the brazing material 102A including the castable refractory is 269 ton, the mass of the iron skin as the brazing frame 102B surrounding the brazing material 102A is 15 ton, the mass M of the hot metal 102 is 284 ton, The mass of 102 is 284 / 21.8 = 13.0 ton / m.

  As the spring 108, the wire diameter is 28 mm, the outer shape is 158 mm, the free length is 300 mm (the effective number of windings is 5.5 in total, 7 windings), the deflection is 100 mm, and the generated spring P = 5.1 ton A coil spring was used, and the deflection of each spring during use of the scissors was determined to be 0 mm.

  As shown in FIG. 8, the main rod 101 and the molten iron 102 are placed on the rod receiving beams 511 and 512. FIG. 8 is a schematic plan view for explaining the structure on which the hot metal 102 in the embodiment shown in FIG. 5 is placed, and the main iron receiving beam 511 and the hot metal 512 (512-1, 512-2, 512). -3) is installed so as to be fixed to the grid-like horizontal beam 522 so as to disperse the force. The grid-like horizontal beam 522 is supported at a predetermined height position by a vertical support beam fixed to the ground 10.

  FIG. 9 shows the effect of applying the present invention.

  When the present invention is applied, when the scissors are used, the total spring force due to the deflection of each spring 108 disposed on each scissor portion exceeds the maximum frictional force F required to pull back each scissor portion. After use, the hot metal 102 can be moved in the direction of the furnace center 100A of the blast furnace while following the transition of the main iron 101 when the hot metal is stopped, and no gap is formed in the connection portion 103 with the main iron 101. There is no need to repair with the additional stamp material, and the moving distance of the hot metal can be significantly suppressed as compared with the conventional example. Moreover, the leakage trouble that the molten iron leaks at the connecting portion 103 with the main rod 101 can be prevented when using the rod.

  On the other hand, the hot metal of the conventional example is a support structure in which the spring receiving members 106 and 106 ′, the receiving columns 107 and 107 ′ fixed to the ground and the spring 108 are not provided, and the connecting portion with the main rod 101 when the rod is suspended. Since a gap is formed in 103 and the gap is repaired with an additional stamp material, the moving distance of the hot metal increases with the number of years since the start of use at the time of construction. In FIG. 9, the moving distance of the hot metal is a distance obtained by measuring the moving distance of the spring receiving member 106 attached to the iron frame 102 </ b> B toward the furnace body 100 in FIG.

  FIG. 7-1 is a schematic side view showing a hot metal support structure according to the present invention, and FIG. 7-2 is a schematic longitudinal sectional view of the hot metal shown in FIG. 7-1. In FIGS. 7-1 and 7-2, reference numeral 206 denotes a spring receiving member attached to the bottom, 207 denotes a receiving column fixed to the ground, and 208 denotes a spring. As a result, the same effects as the support structure shown in FIG. 6-1 can be achieved. The plurality of H-section steels 512-1 arranged outside the flame frame 102 </ b> B of the hot metal 102 has a role of supporting the hot metal 102 with a structural member.

It is a schematic plan view which illustrates the support structure of the hot metal concerning this invention. It is a schematic side view of the hot metal support structure illustrated in FIG. It is XX sectional drawing of FIG. It is the schematic which shows the structure of the main iron suitable for connecting with the hot metal illustrated in FIG. It is a schematic plan view which shows the support structure of the hot metal in an Example. FIG. 5 is a schematic partial explanatory view for explaining the hot metal support structure in the embodiment shown in FIG. 5-1. FIG. 5 is another schematic partial explanatory view for explaining the hot metal support structure in the embodiment shown in FIG. 5-1. FIG. 5 is another schematic partial explanatory view for explaining the hot metal support structure in the embodiment shown in FIG. 5-1. It is a schematic side view which shows the support structure of the hot metal concerning this invention. It is a schematic longitudinal cross-sectional view which shows the support structure of the hot metal concerning this invention. It is a schematic plan view explaining the structure in which the hot metal in the Example shown in FIG. 5 is mounted. It is a graph which shows the effect to which this invention is applied. It is the schematic at the time of construction for demonstrating the problem in the support structure of the conventional hot metal. It is the schematic at the time of use of the iron for demonstrating the problem in the support structure of the conventional hot metal. It is the schematic at the time of a hot iron stop for demonstrating the problem in the support structure of the conventional hot metal. It is the schematic after the iron repair for demonstrating the problem in the support structure of the conventional hot metal. It is the schematic at the time of reuse after repair of the iron for explaining the problem in the support structure of the conventional hot metal. It is the schematic when repeating hot metal repair and reuse for demonstrating the problem in the support structure of the conventional hot metal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main rod 2 Hot metal 1A, 2A Iron material 1B, 2B Steel frame 3 Connection part 4 End surface of main rod 1 51 Receiving beam 52 Horizontal beam 53 Vertical support beam 6 and 6 'spring receiving member 7 fixed to the ground , 7 'Receiving column 8 Spring 9 Roller 10 Ground 11, 12 Moving direction of hot metal 1C Chamotte brick 1D Red brick 1E Castable 1F Main frame 100 Blast furnace body 100A Furnace center 101 Main rod 102 Hot metal (102-1, 102-2, 102-3)
102A Hot metal 102B Hot metal frame 103 Connecting portion 104 Open end α Angle formed between the hot metal flow direction in the hot metal 102-2 and the x-axis direction β Angle formed between the hot metal flow direction in the hot metal 102-3 and the x-axis direction 106, 106 'Spring receiving member 107, 107' receiving column 108 Spring 511 Main rod receiving beam 512-1, 512-2, 512-3 Hot metal receiving beam 522 Horizontal beam a, a 'Thermal expansion amount when using rod Crevice formed in the connecting part 3 of the hot metal 2 3A Stamp material 3B Additional stamp material 20 Dam

Claims (2)

A hot metal support structure for supporting hot metal connected to the main furnace of the blast furnace,
The hot metal is composed of a hot metal having a hot metal passage and a hot metal frame surrounding the hot metal material, and is placed on a structure fixed to the ground while being connected to the main firewood. A spring is arranged between a spring receiving member attached to the hot metal frame of the hot metal and a fixed member fixed to the ground, and is configured to follow the thermal expansion and contraction of the main iron. Hot metal support structure.   The hot metal support structure according to claim 1, wherein a plurality of rollers are arranged between the hot metal and a structure on which the hot metal is placed.

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