JP2001056182A - Vertical shaft cupola/ blast furnace/melting furnace method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate discharge of a high temperature molten metal and slug and further stabilize furnace conditions and furnace operation by providing a furnace bottom face with an inclination angle. SOLUTION: An inclined face structure is constituted by providing a furnace bottom face with an inclination angle. The structure can be constituted by a simple inclined face method in which a molten pig iron bed 2 having an inclination for allowing molten metal and slug to flow is provided on refractory bricks covering a furnace bottom 1 or a triangular pyramid inclined face method in which not only the molten pig iron bed 2 is inclined but also the flat bottom is formed in a triangular form so as to facilitate collection of the molten metal and slug. By this method, the amount of a melt moved is largely increased as compared with that in the prior arts. A cone method in which a pig iron tap hole is formed in a center of the furnace bottom 1 in a funnel shape so as to facilitate flow of a molten liquid can be used and a method in which the pig iron tap hole and a slug tap hole are formed in a bottom face of the furnace is effective. The inclination of an inclined furnace bottom face is preferred to be 15 to 45 degrees, and for increasing melting and discharging speed drastically for improvement an angle of thirty degrees is preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid shaft cupola for melting iron ore, pig iron, sludge, industrial waste, general refuse, and extracting pig iron and slag.
It relates to the blast furnace / melting furnace method.

[0002]

2. Description of the Related Art As a conventional melting furnace such as a cupola, a shaft furnace, or a blast furnace, as shown in FIG. 1, a hearth 1 laid with refractory bricks is formed, and an upper portion of the hearth 1 is used to collect molten pig iron. A slag bed 3 for separating slag is provided at the upper part thereof, and a furnace belly 4 formed of refractory bricks is provided therearound, and a refractory brick is integrally formed on the upper part thereof. Stacked together to form shafts 5, the perimeter of which are surrounded and protected by an iron plate 6. Several dozens of tuyeres 7 for feeding hot air are opened in the furnace wall, and are formed so that heat can be completely transmitted through the raceway 8 in the furnace. The high-temperature hot air blown from here becomes a combustion gas passing between the iron ore raw material and the coke (for example, every 25 layers) in the multi-stage layer 9A, reduces the iron ore, dissolves and removes pig iron down. At the same time, the gas is collected from the furnace top 10 to the blast furnace gas riser 11. In addition, the slag is also taken out of the system. Raw materials 9 such as iron ore, coke, and limestone are charged by a belt conveyor 12.
Is carried to the upper furnace top 10 and put into the hopper 13,
The material is constantly replenished to the raw material charging surface 15 by the large bell 14 at a constant cycle by an external signal. The furnace temperature is higher in the lower part, and is as high as about 2,000 ° C. in the highest region. 16 is a blast furnace support, 17 is a hot blast tube, 18 is a gas ash dust settling device, 19 is a taphole, 20 is a torpedo car for carrying pig iron out there, 21 is a slag outlet, 22 is a slag wheel, and 23 is a hot air loop. Tube.

[0003]

In the conventional cupola, shaft furnace, and blast furnace, the hearth structure, which is a hot metal bed, a metal bed, a slag bed, and a slag bed, has a concave or bowl-shaped structure.
The bottom of the furnace bottom was generally horizontal as shown in FIG. Therefore, the molten and molten slag and slag, as well as hot metal and metal, stay on the horizontal surface at the bottom of the furnace, and the temperature drops during the stay, thereby deteriorating the fluidity and causing the taphole 19 and the slag port 21 to melt. Metal and slag were difficult to come out of.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made to prevent molten metal or slag slag from staying at a furnace bottom to lower the temperature and prevent the metal or slag slag from coming out of a tap hole or a slag port. In order to make the fluidity good and to discharge it from the furnace bottom through the tap hole and the slag port to the outside of the furnace, the furnace bottom was made to have an angle of about 15 degrees or more and about 45 degrees from the conventional horizontal plane This is a method of an inclined surface structure.

[0005]

Embodiments of the present invention will be described.
An inclined surface structure that gives an angle to the furnace bottom. As shown in FIG. 3, the structure is a simple slope system in which a molten metal or a slag slag is provided on a hearth 1 laid with refractory bricks, and a hot metal bed 2 is provided. There is a triangular pyramid type slope system which not only tilts the hot metal bed 2 but also makes it easier to collect molten metal slag slag by making the flat bottom surface triangular. With this method, the flow rate of the melt is much larger than before. In addition, as shown in FIG. 5, there is also a conical method in which the tap hole is shaped like a funnel with the center of the furnace bottom at the center of the furnace so that the melted and melted liquid can flow easily. The tap hole and the tap hole are provided on the bottom of the furnace. The scheme is also effective. As shown in FIG. 6, the angle of the furnace bottom slope is preferably about 15 to 45 degrees, but is preferably about 30 degrees in order to greatly increase and improve the melting and discharging speed. When carried out in the manner described above, the flow rate of the molten metal and slag slag became much larger than before, and hardening at the furnace bottom due to deterioration in flowability was hardly observed.

[0006]

As described above, according to the present invention, the bottom surface of the furnace bottom is formed to have an inclined surface structure of about 15 to 45 degrees, preferably about 30 degrees from the conventional horizontal plane, so that the molten high temperature can be obtained. Metal and slag became easier to discharge.
Furthermore, since the furnace bottom is tilted, the melt generated in the furnace deteriorates at the furnace bottom, eliminating accidents such as poor discharge and solidification inside the furnace, and greatly stabilizing the furnace condition and operation . When hot metal or slag causes poor discharge or solidification in the furnace,
For the recovery, repairs have to be stopped with a huge amount of energy to repair, but the practice of the present invention greatly reduces the above-mentioned accidents, thus saving energy and reducing industrial waste during repairs. There are so many advantages. Further, as shown in FIG. 6, when the furnace bottom angle was changed from about 15 degrees to about 45 degrees, the melt discharge speed was also increased, and among them, about 30 degrees was most desirable.

[0007]

[Brief description of the drawings]

FIG. 1 is a sectional view of a conventional general hard shaft blast furnace.

FIG. 2 is a bottom view of a conventional horizontal plane type furnace.

FIG. 3 is a sectional view of a hard shaft blast furnace and a furnace bottom according to an embodiment of the present invention, showing a simple slope system.

FIG. 4 shows a triangular pyramid type slope system of the present invention.

FIG. 5 is a cone type system of the present invention.

FIG. 6 is a diagram showing a relationship between a furnace bottom angle and a melt discharge speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace bed 2 Hot metal bed 3 Slag bed 4 Furnace belly 5 Shaft 7 Tuyere 15 Raw material charging surface α Optimal outflow angle (about 30 degrees)

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[Procedure amendment]

[Submission date] November 16, 1999 (1999.11.
16)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (2)

[Claims] 1. In a vertical shaft cupola, a blast furnace, and a blast furnace having a furnace belly surrounding an upper part of a hearth so as to form a hot metal bed and a slag bed, and an upper part thereof, an angle is formed at the furnace bottom. A vertical shaft cupola, blast furnace and melting furnace method characterized by taking out molten pig iron and slag. 2. The method according to claim 1, wherein the angle of the furnace bottom is about 15 to 45 degrees, and it is preferable that the angle be around 30 degrees.
Vertical shaft cupola, blast furnace and melting furnace method described.