JPS5959820A - Metal refining furnace and its operating method - Google Patents

Abstract

PURPOSE:To extend the life of a furnace and to improve the heat capacity of a recovered gas by providing bricks having multiple holes in the furnace wall part upper than the slag line part formed by the slag in the upper part of the molten metal in the furnace and connecting the bricks to a coolant source. CONSTITUTION:Bricks 5, 5' having multiple holes are provided in a part of the furnace wall 1 above the slag line formed by the slag 4 in the upper part of the molten metal 2 in the furnace, and the bricks 5, 5' are connected to a coolant source by means of pipelines 6, 6'. The diameter of the holes of the bricks 5, 5' is preferably 0.5-1.5mm. and the spacing between the holes is 20-50mm.. Thereupon, a gas is blown through the bricks 5, 5' into the furnace to cool the wall 1 above the slag line thereby relieving the collision velocity of spitting materials. The gas recovered by the metal refining furnace of such construction is improved to have the quantity of heat much higher than the quantity of heat of the gas from furnaces having ordinary construction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal refining furnace, such as a converter and an electric furnace for steel refining, or a refining furnace for non-ferrous metals such as copper, and a method for operating the same.

For example, in a converter for steel refining, the furnace wall above the slag line in the furnace is close to the fire point (and is the part where the most damage occurs as it is washed away by molten steel and slag. Furthermore, it is damaged by collisions with spiso-etching materials). I often do it.

The present invention aims to solve the above problems, provide a metal smelting furnace with a long furnace life, and improve the heat capacity of recovered gas.

According to the present invention, in a metal smelting furnace, a brick having porous holes is provided in the furnace wall above the slag line formed by the slag above the molten metal in the furnace, and the brick is connected to a coolant source. A metal smelting furnace is provided.

Further, according to the present invention, in a metal smelting furnace, a brick having porous holes is provided in the furnace wall above the slag line formed by the slag above the molten metal in the furnace, and the brick is provided with a porous brick. A method for operating a smelting furnace is provided, which comprises blowing a portion of recovered gas or at least one of steam and hydrocarbons into the furnace to cool the bricks and reduce the collision speed of the spriting material.

According to the present invention, the coolant blown through the porous bricks is an inert gas such as nitrogen, argon, or! ! ! Carbon dioxide, water vapor, or hydrocarbons, which are abundant in ironworks, may be used. Gaseous hydrocarbons such as propane and methane, or liquid hydrocarbons such as heavy oil can be used as the coolant.

Furthermore, the diameter of the pores of the porous brick according to the present invention is 0.5 to],
, 5 mm is preferable, and the hole spacing is preferably 20 to 50 mm+, but it may also be a so-called porous brick with fine pores. If the gap between the holes is small and the hole diameter is large, the amount of gas blown tends to be excessive.On the other hand, if the gap is large and the hole diameter is small, the amount of cooling gas blown will be insufficient, which will reduce the cooling ability of the brick and reduce the collision speed of the spisotined material. No relief can be obtained.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an example of a converted converter according to the present invention.

In FIG. 1, ■ indicates the converter wall, 2 indicates the molten steel, and 3 indicates the lance. Slag 4 is formed on the molten steel 2, and the furnace wall 1
The slag line where the slag 4 and the slag 4 come into contact is the most severely damaged part.

According to the present invention, the furnace wall above the slag line is constructed of 5.5" perforated bricks shown in FIGS. 2 and 3, and the 5.5" perforated bricks are connected to a gas source (not shown) and a pipe line. 6. Connect at 6'.

The porous brick 5 may be constructed by embedding a thin iron vibrator 7 in a brick 9 as shown in FIGS. 2 and 3, or may be constructed from the porous brick itself.

A gas distribution chamber 8 is provided in the outer part of the porous brick 5,
It is connected to conduit 6.

In this way, gas is blown into the furnace through the porous bricks 5 to cool the furnace wall above the slag line, thereby making it possible to reduce the collision speed of the subisotted material.

In the furnace structure of the present invention as described below, the furnace wall is cooled,
Furthermore, since the collision speed of the sluggish material is reduced, damage to the furnace wall above the slag line is prevented.

Furthermore, when blowing gas through small-diameter holes such as the porous brick of the present invention, it is easy to adjust the blowing flow rate. For example, even when the furnace is tilted and the molten steel is being discharged, a small amount of gas may be flowed to prevent the molten steel from adhering to the molten steel. This prevents the holes from clogging.

15' in which the perforated bricks of the present invention were arranged on the furnace wall above the slag line according to the present invention was heated in a test converter at about 1300°C.
4.5% hot metal was blown. Blowing conditions are oxygen 220ON
rr? /hour and the blowing time was about 20 minutes to reach C: 0.1%.

On the other hand, gas-blown bricks are made of 1.
A steel pipe with a diameter of 0 m was used for containment, and was strung within 2 m above the slag line. For comparison, I also left the bricks. Propane from this brick is 15ONm/
I blew time.

After blowing about 500 times and continuing gasification, we compared the degree of damage between gas-blown bricks and regular bricks, and found that while the damage for regular bricks was 200 am, the damage for gas-blown bricks was about 1/10 of that for gas-blown bricks. There were 19 cranes. As described above, the life of the refractories of the gasifier using gas-blown bricks was significantly extended, confirming the superiority of the present invention.

In addition, the calorific value of the converter recovered gas was improved by about 35,000 Kcal/molten iron compared to a conventional furnace structure and the same blowing conditions.

The present invention has been described above using examples in which the present invention is applied to a top-blown converter.
Furthermore, it goes without saying that it is also applicable to nonferrous smelting furnaces such as ladle smelting, electric furnaces, and copper smelting (these are within the technical scope of the claims of this morning). It is within the scope of the right.

[Brief explanation of drawings]

FIG. 1 shows a converter modified according to the present invention. FIG. 2 shows a front view of the gas-blown brick, and FIG. 3 shows a cross-sectional view. 5.5゛: Porous brick, 6.6': Conduit, 7: Porous brick hole (iron pipe), 8: Gas distribution room Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Masahiko Arai Diagram 1 Procedure? l↑Authentic (method) March 8, 1980 Commissioner of the Japan Patent Office Mr. Bamboo Material Japanese Inu■, Small case indication Patent application No. 169713 of 1988
No. 2, Title of the invention Full-bending smelting furnace and its operating method 3,
Relationship with the case of the person making the amendment Applicant Address 5-15 Kitahama, Higashi-ku, Osaka Name (Name> (21,1) Representative of Sumitomo Metal Industries, Ltd.
Norifumi Kumagai 4, Agent Address ■107 502 Akasaka Omotemachi Building, 4-8-19 Akasaka, Minato-ku, Tokyo 5, Date of Amendment Order (=J February 2, 1980 (shipment date February 22) 6 , Subject of amendment Application drawing Power of attorney 7, Contents of amendment (1) Amend the request as shown in the attached sheet. (3) Submit the imprinted drawings. (4) Submit the power of attorney.

Claims (2)

[Claims] (1) In a metal smelting furnace, a brick having porous holes is provided on the furnace wall above the slag line formed by the slag above the molten metal in the furnace, and the brick is connected to a coolant source. A metal smelting furnace characterized by: (2) In a metal smelting furnace, a DJ installs a brick with porous holes in the furnace wall gB at the slag line part formed by the slag above the molten metal in the furnace, A method for operating a metal smelting furnace, characterized in that a part of the recovered gas or at least one of steam and hydrocarbons is blown into the furnace to cool the bricks and reduce the collision speed of the subisolated materials.