JPH0620448U - Hot metal furnace - Google Patents

Abstract

(57) [Summary] [Purpose] To repair erosion of refractory lining materials safely,
Be accurate, quick and easy. [Structure] A melting cylinder 20 is detachably attached to the lower portion of the furnace body 1 and is used as a melting portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot metal furnace (cupola) used for melting pig iron, and more particularly to a hot metal furnace having an improved melting portion.

[0002]

[Prior art]

 In a foundry, a hot metal furnace is conventionally used exclusively for melting pig iron. In this hot metal furnace, coke and pig iron bullion are alternately charged from the upper insertion port of a vertical furnace in which the inner wall of the cylinder of soft iron plate is refractory lined, and compressed air is sent from the tuyere below to burn and burn. Dissolution is performed, and its capacity is expressed by the amount of dissolution (ton) per hour.

FIG. 3 is a view showing a cross section of a main part of a conventional hot metal furnace, in which 1 is a furnace body, and the furnace body 1 is lined with a cylinder 2 of a soft iron plate and an inner wall of the cylinder 2. It is composed of a refractory lining material 3 such as refractory bricks and refractory mortar, and the lower part thereof is the melting part 4. The inner diameter of the inner wall formed of the fireproof lining material 3 is 500 to 600 mm. Reference numeral 5 denotes a bottom furnace that can be removed when opening and repairing the melted portion 4, and is constructed by lining the inner surface of a soft iron plate with a refractory lining material. Reference numeral 6 is a tap gutter for taking out the molten metal, and has a weir 6a for stopping dust there. Further, 7 is a blower pipe, which is connected to a wind box 8 surrounding the lower part of the cylinder 2. The tuyere 9 penetrates to the melting part 4 below the wind box 7, and communicates with the wind box 8 by a tuyere conduit 10. 11 is a sight glass made of fireproof glass. Reference numeral 12 is a base leg, and 13 is a jack.

In this hot metal furnace, coke and metal are alternately charged from an insertion port (not shown) above the furnace body 1, and the coke is ignited and blown from the blower pipe 7 through the wind box 8 and tuyere 9. When the compressed air is sent, the metal is melted in the melting part 4 by the combustion of the coke and a large amount of the coke is melted, and the molten metal is continuously sent out from the bottom furnace 5 through the tapping gutter 6. In this case, as described above, coke and metal are alternately charged in, for example, about 5 layers, so the lower pig iron will be melted in order, and it will gradually collapse and melting will continue in melting part 4. become.

Then, when the amount of hot water taken out from the tapping gutter 6 reaches the initially desired amount of hot water, the ventilation is stopped to cool the whole, and then the supporting jack 13 is loosened and the bottom furnace 5 is removed. The material for combustion is taken out, and the water is extinguished.

However, in this hot metal furnace, the temperature of the melting portion 4 becomes high, so that the portion 4a of the melting portion 4 of the refractory lining 3 material is largely eroded. For example, if the amount of dissolution per hour is around 5 tons, as shown by the broken line, the area from the tuyere 9 upwards is h = 300 to 400 mm, and the upward direction is up to a height of approximately H = 800 mm. Erosion with a maximum depth d = 70-100 mm occurs. Therefore, it is necessary to repair the eroded part for the next melting operation.

[0007]

[Problems to be solved by the device]

 However, this repair was very difficult from the following points. (1) As described above, the worker has to enter the melting portion 4 having a narrow inner diameter of 500 to 600 mm from below, which makes the work difficult. (2) The work involves first removing the deposits and deteriorated refractory lining materials around the eroded area with a chisel, hammer, oxygen gas burner, etc., and then attaching a new refractory lining material. It will be a very tough work covered with dust. (3) There is a risk that the rest of the metal and the deteriorated refractory lining will fall from the upper part. (4) The inner diameter of the dissolution section 4 is an extremely important factor for determining the amount of dissolution per hour, and it is very difficult to accurately dimension it in order to control the amount of dissolution.

An object of the present invention is to solve the above-mentioned problems and to provide a molten pig iron furnace capable of safely, accurately, easily and promptly repairing a molten portion.

[0009]

[Means for Solving the Problems]

 To this end, the present invention provides a furnace body formed by lining the inside of a first iron cylinder with a first refractory lining material, a tap gutter for taking out molten pig iron, and a lower part of the furnace body communicating with the tap gutter. In a hot metal furnace comprising a removable bottom furnace, an iron second cylinder, a second refractory lining material lined inside the second cylinder with the same inner diameter as the inner diameter of the first refractory lining material, and A melting cylinder composed of a second cylinder and a tuyere formed so as to penetrate the second refractory lining material is formed, and the melting cylinder is formed on the inner surface of each of the second refractory lining material and the first refractory lining material. So as to be continuous, is detachably attached between the lower part of the furnace body and the bottom furnace.

[0010]

【Example】

 Embodiments of the present invention will be described below. FIG. 1 is a view showing a cross section of the main part of the hot metal furnace of the embodiment. The same components as those shown in FIG. 3 described above are designated by the same reference numerals, and detailed description thereof will be omitted. In the present embodiment, the refractory lining material 3 of the portion constituting the melting portion 4 of the furnace body 1 is not formed in the cylinder 2, but a detachable melting cylinder 20 is provided in that portion. The melting cylinder 20 is constructed by integrally lining a refractory lining material 22 with an inner diameter similar to that of the refractory lining material 3 inside a cylinder 21 made of a soft iron plate having a smaller diameter than the cylinder 2. 23 is a tuyere. Further, 2a is an upper inner flange for lining the refractory lining material 3, and 2b is a lower outer flange for incorporating the melting cylinder 20, both of which are formed on the cylinder 2. Reference numeral 21a is a lower outer flange formed on the cylinder 21 for installation.

The melting cylinder 20 is attached by inserting the melting cylinder 20 into the cylinder 2 from the lower side with the bottom furnace 5 removed, and by mounting the melting cylinder 20 on the lower side of the flange 2 b of the cylinder 2. The flange 21a of the cylinder 21 of 20 is pressed, and the flanges 2b and 21a are tightened and fixed by bolts and nuts (not shown). As a result, the tuyere 23 communicates with the wing box 8 and matches the sight window 11. The inner wall of the refractory lining material 22 of the melting cylinder 20 is flush with the inner wall surface of the refractory lining material 3. After that, when the bottom furnace 5 is attached by the jack 13, the whole assembly is completed.

As described above, in this embodiment, since the melting cylinder 20 can be removed, even if the refractory lining material 22 of the melting cylinder 20 is corroded by use, the melting cylinder 20 can be removed, for example, the melting cylinder 20. Repairs can be performed from both sides of the 20 openings, which makes repairs extremely easy, safe, quick, and accurate. Further, if a plurality of the same melting cylinders 20 are prepared in advance, they can be used alternately and the melting efficiency can be improved.

FIG. 2 is a view showing a cross section of a main part of a hot metal furnace according to another embodiment. Here, the melting cylinder 30 is composed of a cylinder 31 and a refractory lining material 32 as in FIG. 1, and a tuyere 33 is provided, and a cylinder 34 is provided outside the cylinder 31. A portion between 34 is a cooling water passage 35. Reference numerals 36 and 37 denote pipes for connecting a cooling water circulation hose detachably (screw type) connected to the cylinder 34.

In this embodiment, in addition to being able to attach and detach the melting cylinder 30, cooling water can be circulated in the cooling water passage 35, so that the progress of erosion of the melting cylinder 30 can be delayed. The refractory lining material 32 can be made thin.

In each of the above-described embodiments, the cylinder 2 of the furnace body 1 is left as in the conventional case, and the melting cylinders 20 and 30 are detachably fitted in the lower portion thereof, but the lower portion of the furnace body 1 The portion may be formed as a mounting portion, and a pipe for mounting the blower pipe 7, a wind box 8, a peep window 11 and the like may be provided on the melting cylinders 20 and 30 side. By doing so, the thickness of the refractory lining materials 21, 31 of the melting cylinders 20, 30 can be increased.

[0016]

[Effect of device]

 From the above, according to the present invention, the melting cylinder functioning as a melting part can be attached to and detached from the furnace body, so that even if the refractory lining material of the melting cylinder erodes, it can be repaired in a state where it is removed from the furnace body There is an advantage that the repair can be performed safely, surely, quickly and easily.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a hot metal furnace according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a hot metal furnace according to another embodiment.

FIG. 3 is a cross-sectional view of a main part of a conventional hot metal furnace.

[Explanation of symbols]

1: Furnace body, 2: (first) cylinder made of soft iron plate, 3: (first) refractory lining material, 4: melting part, 5: bottom furnace, 6: tapping gutter, 7: blow pipe, 8: wind Box, 9: tuyere, 10: tuyere conduit, 11: viewing window, 12: stand leg, 13: jack, 2
0: melting cylinder, 21: (second) cylinder, 22: (second) fireproof lining material, 23: tuyere, 30: melting cylinder, 31: (second) cylinder, 32: (second) fireproof lining material , 33: tuyere, 34: cylinder, 35: cooling water passage, 36, 37: pipes for connecting cooling water circulation hose.

Claims (2)

[Scope of utility model registration request] 1. A furnace body formed by lining the inside of a first iron cylinder with a first refractory lining material, a tap gutter for taking out molten pig iron, and a detachable part for communicating the lower part of the furnace body with the tap gutter. In a hot metal furnace comprising a bottom furnace, a second cylinder made of iron, a second refractory lining material lined inside the second cylinder with the same inner diameter as the inner diameter of the first refractory lining material, and the second cylinder. And a tuyere formed so as to penetrate the second refractory lining material, so that the inner surfaces of the second refractory lining material and the first refractory lining material are continuous with each other. The hot metal furnace is detachably mounted between the lower part of the furnace body and the bottom furnace. 2. The molten pig iron furnace according to claim 1, wherein the melting cylinder has a cooling water passage in its periphery.