JP5685974B2 - Blast furnace - Google Patents

Description

  The present invention relates to a blast furnace for discharging from a blast furnace, and particularly to a hot metal tip of the blast furnace.

  The blast furnace is a facility for producing hot metal by reducing iron ore, sintered ore, and the like, which are raw materials, using coke or the like.

  And, when leaving the blast furnace, a blast furnace made of large iron, hot metal, and tilting iron is used. That is, the hot metal discharged from the blast furnace is separated into hot metal and slag by the large hot metal, and the hot metal passes through the hot metal and the tilting iron and is received by the hot metal pan (topy car). In many cases, the tip of the hot metal has a semicircular cross section, in which case it is called a round iron.

  Here, the temperature of the hot metal is very high, around 1500 ° C., and the blast furnace iron is worn out by the high temperature and flow, so repairs are frequently performed. Among them, Marutake is close to the hot metal ladle, so it is easily affected by radiant heat and wear is severe. When the round rod is worn out, there is a problem that the trajectory of the falling rod on the tilting rod changes, so that particularly frequent repairs are required. The life of the blast furnace is controlled by the amount of wear of round and large.

  Here, FIG. 5 and FIG. 5 is a side view, and FIG. 6 is a front view. 5 and 6, a portion surrounded by a thick solid line is a round fence 50, a round fence outer part 51 formed of an iron skin and a firebrick, and an irregular refractory inside the round fence outer part 51. And a round flow path portion 52 through which molten iron flows.

  The round iron 50 is connected to a hot metal main body 62 via a stamp material (connecting member) 61 formed of a refractory material.

  When such a round gob 50 is worn and repaired, as shown in FIGS. 5 and 6, using the crane 71, the round gob 50 (the round gourd portion 51 and the round goose channel portion 52) is used. A method of exchanging a set of the refractories or a method of breaking the round flow passage portion (refractory portion) 52 once and pouring and forming an irregular refractory again.

  However, both the method of exchanging a set of the round buns 50 or the method of re-forming only the round culvert channel 52 requires a long time for repair work. For example, in the method of exchanging a set of round gouges 50, since the entire gouge 50 and its bottom equipment are exchanged, it takes time to exchange, and repair work takes about 30 hours. Further, even in the method of re-forming only the round gondal channel portion 52, the refractory must be broken and newly poured and dried, and repair work takes about 20 hours. In addition, since the work is still a hot work (hot repair work), the atmosphere temperature is 70 to 80 ° C., which is a severe work environment. In addition, since the repair work time (repair time) of the round gob 50 is long, the big goose has to be replaced and repaired at the same time when the amount of wear of the big gouge itself does not reach the repair guideline. As described above, the life of the round canopy 50 becomes the life of the blast furnace fire, and there is a problem that the number of times of repairing the firewood is large.

  Therefore, conventionally, there has been a demand for shortening the repair time of the round iron (hot metal tip) and extending the life of the blast furnace iron.

  On the other hand, in the blast furnace iron described in Patent Document 1, as a structure of the hot metal tip portion, a round iron flow passage portion (refractory portion) through which the hot metal flows is freely attached to and removed from the round iron outer shell portion. It has a structure that can be done. Thus, when repairing a round gore, it is only necessary to prepare a new round gore channel part for replacement in advance and replace the worn round gore channel part with the new round gore channel part. In addition, the repair time can be shortened, and the new round gourd channel part can be sufficiently dried and reinforced in advance, so that the life can be extended.

  However, in the blast furnace described in Patent Document 1, the round flame passage portion (refractory part) moves forward during use, and a gap is formed between the stamp material and the molten iron leaks from the gap. There is a risk of leakage accidents. This leakage accident leads to a serious disaster. Therefore, it is difficult to use the blast furnace furnace described in Patent Document 1 in actual operation as it is, and it is impossible to actually reduce the repair time of the round furnace and improve the life of the blast furnace furnace.

  The present invention has been made in view of the above circumstances, and as a blast furnace for discharging from a blast furnace, shortening the repair time of the hot metal tip (round iron) and the life of the blast furnace in actual operation. An object of the present invention is to provide a blast furnace furnace capable of realizing improvement.

  In order to solve the above problems, the present invention has the following features.

  [1] A blast furnace for discharging from a blast furnace, in which a flow path portion through which molten iron flows can be freely attached to and detached from the outer shell constituting the outer shell of the hot metal tip. And a stamp material connecting the main body of the hot metal and the flow path portion and the flow path portion are connected via a stepped portion.

  [2] The blast furnace shell according to [1], wherein an outer peripheral surface in contact with the outer portion of the flow path portion is an iron shell, and a refractory is applied on the inner side.

  [3] The stopper according to [2], wherein a stopper is provided between the outer portion and the flow path portion to prevent the flow path portion from moving in the hot metal flow direction. Blast furnace firewood.

  The blast furnace iron according to the present invention can reduce the repair time of the hot metal tip (round iron) and improve the life of the blast furnace iron in actual operation.

It is side surface sectional drawing which shows one Embodiment of this invention. It is front sectional drawing which shows one Embodiment of this invention. It is a graph which shows the relationship between the amount of wear of a round gob and a large gourd, and a blast furnace life in a conventional example. It is a graph which shows the relationship between the amount of wear of a round gob and the large gourd in the example of this invention, and a blast furnace life. It is a side view which shows a prior art. It is a front view which shows a prior art.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 show a round iron (hot metal tip) in a blast furnace iron according to an embodiment of the present invention. 1 is a side sectional view, and FIG. 2 is a front sectional view.

  As shown in FIG. 1 and FIG. 2, the round gob 10 in this embodiment is installed inside the round gourd outer portion 11 made of steel, and is in contact with the gourd outer case 11. The outer peripheral surface is the iron skin 12b, the refractory 12a is constructed on the inner side, the surface facing the hot metal main body 22 is formed of a refractory, and the half of the half donut-shaped cross section is closer to the hot metal main body 22 side. It is comprised from the round flow path part 12 in which the hot metal flows through which the level | step-difference part 15 which protrudes was formed.

  In addition to functioning as a part of the mold when the refractory 12a formed on the inside is constructed by setting the outer peripheral surface to the iron skin 12b, the round culvert channel portion 12 The risk of damage to the refractory 12a is reduced, improving the workability of the replacement work and shortening the replacement time.

  And the round iron 10 is connected with the main body 22 of hot metal via the stamp material (connection member) 21 formed with the refractory.

  In addition, in this embodiment, the round gourd channel portion 12 can be freely attached to and detached from the round goose shell portion 11, and when the round goose channel portion 12 is worn out, it is removed. Thus, it can be exchanged for a new round gourd channel portion 12. Therefore, in the following, the round gourd channel portion 12 will be referred to as an exchange bottle.

  In order to prevent the exchange rod 12 from moving forward during use and the molten iron from leaking between the exchange rod 12 and the stamp material 21, the exchange rod 12 and the round rod outer portion 11 are suitable for the exchange rod 12. A step 15 having a wide width is provided, and the refractory 12a is embedded in the stamp material 21 so as to form a semicircular hot metal flow path between the hot metal body 22 and connected. Is done.

  As a result, even if the exchange iron 12 moves forward during use, the step 15 is present, so if the movement distance of the exchange iron 12 is within the width (length in the front-rear direction) of the step iron 15, There is no gap to leak out. Therefore, the hot metal is prevented from leaking out between the replacement iron 12 and the stamp material 21. The width of the step portion 15 is preferably 50 mm or more.

  In addition, an anti-displacement stopper 16 is provided between the exchange rod 12 and the round rod outer shell portion 11 to restrain the forward movement of the exchange rod 12. For example, as shown in FIG. 1, the misalignment prevention stopper 16 can be formed by providing a pair of protrusions that engage with each other so that the exchange rod 12 does not move in the molten iron flow direction with respect to the round shell outer portion 11. it can. The misalignment prevention stopper 16 may be formed in a semicircular shape along a front cross-section (for example, FIG. 2) between the replacement rod 12 and the rounded outer shell portion 11, but is partially formed as shown in FIG. May be. The displacement prevention stopper 16 also functions as an alignment when the replacement rod 12 is replaced, so that the replacement time can be shortened. Two or more misalignment prevention stoppers 16 may be installed.

  And the spread prevention anchor 17 is attached to the upper end part of the exchange rod 12 so that the exchange rod 12 will be in the state which contacted the round fence outer shell part 11 by thermal expansion, and it will not interfere when removing the exchange rod 12. In addition, a contact prevention stopper 18 is inserted between the replacement rod 12 and the round rod outer shell portion 11. When the replacement rod 12 is replaced, first, the contact prevention stopper 18 is removed, so that even if the replacement rod 12 expands outward due to heat, a clearance with the round shell outer portion 11 can be secured. It becomes easy to remove and replace the heel shell 11.

  As described above, in this embodiment, the step portion 15 provided between the replacement rod 12 and the stamp material 21 and the shift prevention stopper provided between the replacement rod 12 and the round shell outer portion 11. The action 16 prevents the molten iron from leaking out between the exchange rod 12 and the stamp material 21 during use, so that it can be used safely in actual operation.

  Then, it is only necessary to prepare a new replacement rod 12 for replacement in advance and replace the worn replacement rod 12 with the new replacement rod 12. Therefore, the repair time can be shortened, and the new replacement rod 12 can be sufficiently prepared in advance. Since it is possible to strengthen by drying and curing, it is possible to extend the life.

  In this manner, the blast furnace iron according to this embodiment can realize a reduction in the repair time of the hot metal tip (round iron) 10 and an improvement in the life of the blast furnace iron in actual operation.

  In this embodiment, in order to prevent the molten iron from leaking between the replacement rod 12 and the stamp material 21 during use, a step portion 15 is provided between the replacement rod 12 and the stamp material 21, and the replacement rod Although the shift prevention stopper 16 is provided between 12 and the round shell outer shell part 11, depending on the case, either one may be provided.

  As an example of the present invention (example of the present invention), the present invention shown in FIGS. 1 and 2 was applied to actual operation.

  As a result, the hot metal did not leak from between the replacement iron and the stamp material during use, and the operation could be performed safely.

  In the case of using the prior art shown in FIGS. 5 and 6 (conventional example), the repair time of the round iron (hot metal tip) took 30 hours, but it was reduced to 4 hours. We were able to.

  FIG. 4 shows the relationship between the change in the amount of wear of the round and large rods and the life of the blast furnace in accordance with the amount of ligation in the example of the present invention. Compared with the relationship between the change in the amount of wear of round and large irons and the blast furnace life in the conventional example shown in FIG. 3, in the example of the present invention, the life of the blast furnace is changed from the conventional 120,000 tons to 160,000 tons. 1.3 times higher.

  This confirmed the effectiveness of the present invention.

10 Round iron (hot metal tip)
11 Round wall outer part 12 Round wall channel part (replacement wall)
12a Replacement refractory part 12b Replacement iron core 15 Stepped part 16 Displacement prevention stopper 17 Spread prevention anchor 18 Contact prevention stopper 21 Stamp material (connecting member)
22 Hot metal body 50 Round iron (hot metal tip)
51 Round wall outer part 52 Round wall channel part 61 Stamp material (connecting member)
62 Hot metal body 71 Crane

Japanese Utility Model Publication No. 2-053957

Claims (3)

  A blast furnace for brewing from the blast furnace, and at the tip of the hot metal, it is possible to freely attach / remove the flow path part through which the hot metal flows, with respect to the outer part constituting the outer part, A blast furnace iron, characterized in that a stamp material connecting the hot metal main body and the flow path portion and the flow path portion are connected via a stepped portion.   2. The blast furnace dredge according to claim 1, wherein an outer peripheral surface of the flow path portion that is in contact with the outer shell portion is an iron shell, and a refractory is applied on the inner side.   The blast furnace furnace according to claim 2, wherein a stopper is provided between the outer shell part and the flow path part to prevent the flow path part from moving in the direction in which the hot metal flows.

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