JP5044954B2 - Hot metal support structure - Google Patents

Description

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

  In the blast furnace, the hot metal and slag are separated by a dam provided on the main rod, and a hot metal for transporting the separated molten iron to a predetermined position is connected to the main rod and inclined toward the other end. Placed on the blast furnace structure. The main body and the hot metal are required to have a structure in which the main body is made up of the hot metal in which the hot metal passage is formed and the hot metal frame surrounding the hot metal material to prevent leakage, and has excellent durability. The

As the structure of the main rod of the blast furnace, a rod formed by lining a high-density panel block is known in order to extend the life of the brazing material that is eroded by both molten metal and slag. Further, the hot metal structure has the same main body structure as that of the main iron, but the hot metal support structure causes a problem as shown in FIG. Hereinafter, the problem of the hot metal support structure will be described in detail.
FIGS. 2-1 to 2-6 are cross-sectional views showing the state of the hot metal 2 of the hot metal 2 in each process, and show the vicinity of the hot metal 2 connected to the main iron 1 via the connecting portion 3. In FIG. 2, the code | symbol 20 shows the weir which isolate | separates hot metal and slag. As shown in FIG. 3, the hot metal 2 is provided with an inclination angle θ through the hot metal receiving beam 51 in order to flow down the hot metal. The inclination angle θ of the hot metal 2 is defined by an angle formed between the hot metal flow direction and the horizontal plane F, and is actually θ≈5 °. The connection part 3 between the main iron 1 and the hot metal 2 is shown in detail in FIG. 2-1, but one end of the main iron 1 and one end of the hot metal 2 are arranged so as to overlap each other in the vertical direction. At the time of construction, the stamp material 3A, which is a refractory material, is provided between the main iron 1 and the hot metal 2 spaced apart from each other, and between the hot metal 2A of the hot metal 2 in the longitudinal direction of the hot metal and the hot metal 1A of the main iron 1. It is constructed by construction.

  The stamp material 3A constituting the connecting portion 3 uses a refractory that can absorb the elongation compared to the brazing materials 1A and 2A. The hot metal 2 is pushed in the longitudinal direction by the punch 1 through the stamp material 3A, and moves in the longitudinal direction by the amount indicated by a in FIG. Thereafter, 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-furnace body changes as the main rod 1 contracts in the longitudinal direction. At that time, by design, the hot metal 2 moves after a force equal to or greater than the maximum frictional force F expressed by the following formula (1) is applied.

F = M × μ (1)
M: mass of hot metal, μ: friction coefficient between hot metal frame and structure on which hot metal is placed (μ = F / M = sin α, α: angle when hot metal 2 starts to slide)
However, since the bonding force between the brazing material 1A of the main rod 1 and the stamping material 3A is not so large, the joint 3 is cracked, and a gap b is formed as shown in FIG. Will be. Therefore, as shown in FIG. 2-4, 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.

  On the other hand, when repairing the scissors without repairing the sputum that fills the gap b, it will lead to a leakage trouble in which the hot metal leaks from the clearance b formed at the connecting portion between the main spear and the hot metal. In order to prevent leakage that leads to such a serious disaster, it is essential to repair the defects that fill the gap b. After repairing the scissors and restarting, the hot metal 2 is pushed by the main scissors 1 in the longitudinal direction of the scissors through the stamp material 3A and the additional stamp material 3B, as shown in FIG. As a result, the hot metal 2 can not be pulled back in the longitudinal direction of the hot metal by a 'in the longitudinal direction of the hot metal 1 by following the main hot metal 1 for the above-described reason. Thus, repair work for the ridge 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 scissor reuse are repeated, the amount of movement of the hot metal 2 in the longitudinal direction of the scissors 2 increases every time the scissors are repaired. As shown in FIG. It will be in the state where the overlap of hot metal 2 disappears. 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.

For the purpose of solving such a problem, as shown in FIG. 4, a spring 8 is disposed between the receiving column 7 and the spring receiving member 9, and a force for returning the hot metal 2 toward the main rod 1 is provided. A supporting structure for the hot metal to be imparted has been proposed (Patent Document 1). In FIG. 4, the hot metal receiving beam 51 of the hot metal 2 is placed on a horizontal beam 52 which is a structural member of the blast furnace, and the horizontal beam 52 is supported by a vertical support beam 53 fixed to the ground 10. If the hot metal support structure described in Patent Document 1 is arranged so that all the hot metal passes through the center of the blast furnace, the design relating to the installation positions and spring strengths of the springs 8 provided on both sides of the hot metal width direction is possible. This structure is easy and can provide a desired effect.
JP-A-2005-232552

  However, as shown in FIG. 5, for example, the molten iron 2 not connected to the main rod 1 is bent by α and β with respect to the x-axis direction on the structural member of the blast furnace. It is usual that it is arranged. Therefore, the hot metal support structure described in Patent Document 1 is designed on the both sides of the hot metal width direction in consideration of the influence of the moment when the hot metal 2 moves due to thermal expansion / shrinkage generated in the main blast furnace. The installation position and spring strength of the spring 8 to be provided must be designed, and the design becomes extremely difficult.

In addition, when the hot metal support structure described in Patent Document 1 is applied to the hot metal of an actual blast furnace, the springs provided on both sides of the hot metal width direction are normal due to the influence of the moment when the hot metal 2 moves. There is a possibility that it will not function properly.
In addition, since the hot metal support structure described in Patent Document 1 is required to dispose the spring 8 between the receiving post 7 and the spring receiving member 9, when used for a long period of time, the design effect can be obtained. There is concern about whether it can be sustained.

  An object of the present invention is to solve the above-mentioned problems and to provide a hot metal support structure that can be applied to a hot metal of an actual blast furnace and can maintain the design effect for a long time.

The present invention is as follows.
1. One end is connected to the main furnace of the blast furnace, the other end is connected to the hot metal that is bent with respect to the axial direction passing through the center of the blast furnace, and is inclined toward the other end. A hot metal support structure mounted on a structural member via a receiver, wherein the hot metal receiver connected to the main iron is fixed to the structural member of the blast furnace, and the upper surface is a horizontal receiving surface. The support member is configured to receive the foot member fixed to the hot metal frame by the horizontal receiving surface, and a fluororesin and / or between the upper surface of the foot support member and the lower surface of the foot member A hot metal support structure comprising a silicon resin .

  The hot metal support structure according to the present invention has a structure that can follow the thermal expansion and contraction that occurs in the main body of the blast furnace. It can be sustained. Therefore, 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.

Hereinafter, the hot metal support structure according to the present invention will be described in comparison with the conventional hot metal support structure. The hot metal support structure according to the present invention is shown in FIG. FIG. 1 is a side view corresponding to the side view showing the conventional hot metal support structure shown in FIG.
As shown in FIG. 1, the hot metal support structure according to the present invention comprises a hot metal support member 5 in which the hot metal 2 is fixed to the structural member of the blast furnace and the upper surface is a horizontal receiving surface. The foot member 6 fixed to the heel frame of the heel 2 is received by a horizontal receiving surface. At that time, the main body structure of the hot metal 2 and the connection structure for connecting the main iron 1 and the hot metal 2 through the connecting portion 3 can be the same as the conventional one. In practice, the inclination angle θ of the hot metal 2 is preferably θ≈5 °.

On the other hand, in the conventional hot metal support structure, the hot metal 2 is received by the hot metal receiving beam 51, and the hot metal 2 is placed on the structural member of the blast furnace with an inclination angle θ through the hot metal receiving beam 51. ing.
Here, in the hot metal support structure according to the embodiment of the present invention, the upper part of the steel iron support member 5 is formed of a heat-resistant low friction resin layer 5a, and the steel iron support member is formed. The frictional resistance between the upper surface of 5 and the lower surface of the steel foot member 6 fixed to the frame of the hot metal 2 is reduced. As the low-friction resin, a fluororesin, a silicon resin, or the like that can reduce the friction resistance can be suitably used as compared with the friction resistance when the steel members are brought into surface contact with each other and moved. However, the effect of the low friction resin layer can also be exhibited by providing it in the lower layer of the steel foot member 6 instead of providing it in the upper part of the steel heel support member 5.

  In addition, when the low friction resin layer is provided between the steel members in design, if the effect is insufficient, instead of providing the low friction resin layer, A roller may be disposed between the lower surface of the foot member 6. When a roller is provided as a low friction means between steel members, the frictional resistance can be significantly reduced compared to the frictional resistance when the steel members are brought into surface contact with each other and one of them is moved. it can.

According to the hot metal support structure according to the present invention described above, the design calculation of the structure that supports the hot metal becomes easy, and the structure can follow the thermal expansion and thermal shrinkage that occurs in the main body of the blast furnace. be able to.
That is, as shown in FIG. 5, for example, the hot metal of the blast furnace is arranged on the structural member of the blast furnace with the hot metal 2 not connected to the main iron 1 bent by α and β with respect to the x-axis direction. Although a moment is generated in the hot metal 2 with thermal expansion and contraction generated in the main rod of the blast furnace, the hot metal support structure according to the present invention has a foot member 6 fixed to the hot metal frame of the hot metal 2. Since the structure is such that it is received by a horizontal receiving surface, its influence can be easily estimated in the design.

  As an example, when the coefficient of dynamic friction between the rod receiving beam 51 and the molten iron 2 is 0.3, when the main rod 1 moves due to thermal expansion / contraction of the main rod 1, for example, the main rod 1 shown in FIG. The force relating to the hot metal 2 connected to the metal through the connecting part 3 is calculated as 969 kN by design. On the other hand, when the hot metal support structure according to the present invention is applied and the low friction resin layer 5a is provided between the upper surface of the heel support member 5 and the lower surface of the foot member 6, the force Becomes 882 kN, and the force acting on the contact portion 3 can be reduced by about 10%.

  Therefore, by applying the hot metal support structure according to the present invention to the actual hot metal, the effect can be maintained over a long period of time. Therefore, the hot metal 2 is made to follow the transition of the end face of the main iron 1. Can be moved in the furnace body direction, and a gap can be prevented from being generated in the connecting portion 3. As a result, it is possible to reduce the repair work of the connecting portion 3 between the main rod 1 and the hot metal 2 and to reduce the refractory cost such as the additional stamp material and the maintenance cost.

The hot metal support structure according to the present invention was applied in placing hot metal on the cast floor of a blast furnace having a furnace internal volume of 5150 m ³ . At that time, a low-friction resin layer made of fluororesin was provided on the upper portion of the heel support member 5. After applying the hot metal support structure according to the present invention, the hot metal was used, and the hot metal was used 3 times per day and 3 years passed, but the amount of movement caused by repair of the hot metal 2 was about 100 mm. Therefore, there is no need to return the hot metal position.

  On the other hand, when the conventional hot metal structure as shown in FIG. 3 was adopted, the repair of the main iron which was carried out by extracting the hot metal in the main iron was repeated about once every 10 days. The amount of movement caused by repairing the hot metal 2 after about 3 years of use is about 700 mm, and it is impossible to repair just by filling the connecting part between the main metal and the hot metal with stamp material. Construction to return to the side was necessary.

It is a schematic plan view which illustrates the support structure of the hot metal concerning this invention. 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. It is a schematic side view of the conventional hot metal support structure. It is sectional drawing which shows the hot metal support structure of patent document 1. As shown in FIG. It is an arrangement plan of receiving pillar 7 which receives spring force at the time of applying the hot metal support structure given in patent documents 1.

Explanation of symbols

a, a ′ Thermal expansion amount when using hot metal b Clearances formed at connecting part 3 of hot metal 2 α, β Angle formed between hot metal flow direction and x axis direction F Horizontal plane θ Hot metal inclination angle 1 Main steel 2 Hot metal 1A, 2A Iron material 1B, 2B Steel frame 3 Connection part 3A Stamp material 3B Additional stamp material 4 End surface of main iron 1 5 Metal support member 5a Low friction means (low friction resin layer)
6 foot member 7 receiving column 8 spring 9 spring receiving member 10 ground 20 weir 51 heel receiving beam 52 horizontal beam 53 vertical support beam

Claims (1)

One end is connected to the main furnace of the blast furnace, the other end is connected to the hot metal that is bent with respect to the axial direction passing through the center of the blast furnace, and is inclined toward the other end. A hot metal support structure mounted on a structural member via a receiver, wherein the hot metal receiver connected to the main iron is fixed to the structural member of the blast furnace, and the upper surface is a horizontal receiving surface. The support member is configured to receive the foot member fixed to the hot metal frame by the horizontal receiving surface, and a fluororesin and / or between the upper surface of the foot support member and the lower surface of the foot member A hot metal support structure comprising a silicon resin .

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