KR20100098578A - Cooling element for cooling the fireproof lining of a metallurgical furnace (ac, dc) - Google Patents

Abstract

A cooling element for cooling the refractory lining of a metallurgical furnace. A cooling element is to be provided which prevents coolant from entering the interior of the furnace while maintaining a good cooling action. This is achieved by a cooling plate which faces the refractory lining, a heat-conducting plate which is arranged at an angle to the latter, which is fixedly connected to the cooling plate and extends out of the furnace wall. The cooling plate and the heat-conducting plate are made of solid material. A coolant channel which is fixedly connected to the heat-conducting plate is connected to a coolant input and a coolant output.

Description

COOLING ELEMENT FOR COOLING THE FIREPROOF LINING OF A METALLURGICAL FURNACE (AC, DC)}

The present invention relates to a cooling element for cooling a refractory lining to metallurgy.

EP 887 428 A1 and DE 10 2004 035 968 A1 comprise plates which are made of copper or copper alloy and are directed towards the refractory lining of a metallurgical furnace, such as a furnace, with channels formed therein for guiding the refrigerant. Cooling elements are disclosed.

However, the cooling element of the type described above has the disadvantage that the refrigerant, generally water, flows through the parts facing the interior of the furnace, so that in the event of failure or leakage, water may enter the interior of the furnace.

It is an object of the present invention to provide a cooling element which provides a relatively good cooling effect and which does not have any potential hazards as described above.

According to the invention, the object is a cooling plate made of a solid material, opposed to the refractory lining, disposed at an angle to the refractory lining, fixedly connected to the cold plate, extending outward from the furnace wall. , A heat conduction plate made of a solid material, and a refrigerant channel fixedly connected to the heat conduction plate and connected to the refrigerant inlet and the refrigerant outlet.

The cold plate, the heat conduction plate and the refrigerant channel are made of a high thermal conductivity material, for example copper or a copper alloy, the refrigerant channel preferably extending along the narrow side of the heat conduction plate.

Due to the high thermal conductivity of the cooling elements, very much heat is released from the area between the refractory lining and the steel plate of the furnace vessel so that the furnace vessel no longer needs to be cooled by water spray or cooling duct from the outside (dry furnace vessel) . The cooling element may comprise a copper plate having fine grain structure for good thermal conductivity produced by the processing of any of rolling, forging and casting. According to the invention, two solid copper plates of this kind can be welded (heat-conductively bonded) or bent together to form a T-shape (or L-shape). In addition, the end of the welded copper plate is welded to a copper pipe that functions as a refrigerant channel. This copper tube is cooled by cooling water, through the connected cooling plate, to sufficiently cool the brick lining of the furnace vessel located in the installation area. The size, the amount per unit area, the cooling circuit and the spacing between the plurality of heat conduction plates protruding out of the furnace vessel are calculated and determined according to the heat removal required. The cooling elements are equipped with corresponding measuring instruments for monitoring the temperature and heat removal curves.

The cooling element may be installed at any position (horizontal or vertically, top or sidewall or bottom) of the furnace vessel between the brick lining and the steel wall or top or bottom of the vessel. Preferably, these cooling devices comprise a lower and / or intermediate region (metal and slag liquid region and junction or skewback region or DC furnace) of the vessel sidewall between the refractory lining and the steel plate of the furnace vessel. In the case of a gaseous phase). The placement of the cooling element in the junction region of the brick lining does not impair the reinforcement of the furnace vessel placed in this position. The cooling element can be connected to the furnace vessel by screws or the like. A thermally conductive contact mass is inserted by tamping between the cooling element and the brick lining.

The cooling element may receive cooling water through a copper tube welded to the outer surface. The water cooled portion of the cooling element is arranged outside of the furnace vessel. Thus, if leaking, no water enters the furnace and does not adversely affect the operation of the furnace. Multiple cooling elements are connected to each other in series to form a cooling circuit. However, the individual positions are selected in such a way that when the cooling circuit fails, the adjacently located regions continue to be indirectly cooled. The cooling element should preferably be connected to closed cooling circuits.

However, if there is a semi-closed or open cooling system as a result of the modification, the cooling element may be connected to the cooling system if the coolant water quality and flow content are within defined tolerances (characteristics).

The advantages obtainable by the cooling element according to the invention can be summarized as follows.

완전 건조형 노 용기를 얻음에 따른 개선

Improvements in obtaining a completely dry furnace vessel

분무 냉각 및 캐스케이드 냉각(cascade cooling)에 비해 개선된 열 제거

Improved heat removal compared to spray cooling and cascade cooling

노 용기에 대한 정적 조건이 유지되어야 하는 영역에서의 활용가능성

Applicability in areas where static conditions for furnace vessels should be maintained

Compared to other systems, only small openings are required in the furnace vessel, which has a positive effect on the stability and bonding of the upper and lower vessels. The amount of heat removed by the cooling element is sufficient to prevent damage to the affected structural components and to cool the inner side opposite to the process that causes the solidified or cooled non-reactive product to form self-protection.

Another advantage is that when an externally dried furnace vessel is obtained, especially when there is a very high level of contaminants (sulfur and / or dust), and corrosion of the furnace vessel wall and stoppage of the coolant stop the pump due to shutdown of the pump. When it causes a problem, it appears. The cooling element is not in direct contact with the process or product (slag and / or metal) and can easily be combined with other copper cooling systems that are not located in statically important areas of the furnace vessel. These cooling elements may be located in difficult-to-reach locations of the furnace vessel, but in particular may also be located in the bottom jut of rectangular vessels in which open spray cooling has been conventionally required as needed. Cooling elements can be used in AC and DC reduction furnaces with rectangular furnace vessels and circular furnace vessels. When used in alternating current and direct current reduction furnaces with circular furnace vessels, the cooling element is particularly preferred because the static and / or stability of the furnace vessel is not impaired by form, shape or installation location.

1 is a perspective view of a cooling element.
2 shows the arrangement of the cooling elements in the furnace wall.
3 shows an arrangement of round furnace vessels.
4 shows an arrangement of a rectangular furnace vessel in combination with another system.

In the following, an embodiment of a cooling element according to the invention is described with reference to the drawings.

The cooling element comprises a cooling plate 1, a heat conducting plate 2 and a refrigerant channel 3 connected thereto. The refrigerant channel 3 includes a refrigerant inlet 4 and a refrigerant outlet 5. In order to obtain the most appropriate thermal conductivity, these parts are all made of copper or a suitable copper alloy.

FIG. 2 shows the cold plate 1 being placed directly between the outer casing of the metallurgical vessel 6 and the refractory lining 7 facing the interior of the furnace. Preferably, the cold plate is embedded in a heat-conducting contact mass 8 formed by tamping.

The arrangement of the cold plate 1, the heat conduction plate 2 and the coolant channel 3 is shown, for example, as installed in a circular furnace vessel in FIG. 3 and in a rectangular furnace vessel in FIG. 4. Shows another cooling element system.

3 and 4 clearly show that the coolant channel is located outside the furnace vessel, such that a dry furnace vessel can be formed.

Claims (7)

As a cooling element for cooling the refractory lining to metallurgy,
A cold plate 1 made of a solid material, opposite the refractory lining,
A heat conduction plate 2 made of a solid material, disposed at an angle to the refractory lining, fixedly connected to the cooling plate 1, and extending outwardly from the furnace wall; and
A refrigerant channel 3 fixedly connected to the heat conduction plate 2 and connected to a refrigerant inlet 4 and a refrigerant outlet 5.
Including,
Cooling element. The method of claim 1,
The cooling plate 1, the heat conduction plate 2 and the refrigerant channel 30 are made of a high thermal conductivity material such as copper or copper alloy,
Cooling element. The method according to claim 1 or 2,
The refrigerant channel 3 extends along the narrow side of the heat conducting plate 2,
Cooling element. 4. The method according to any one of claims 1 to 3,
Comprising a high thermal conductivity material, such as a copper plate with a fine grain structure produced by any of rolling, forging and casting processes,
Cooling element. The method according to any one of claims 1 to 4,
The copper plate 1 and the heat conductive plate 2 are welded or bent to each other in a heat conductive manner to form a T-shape or L-shape,
Cooling element. A metallurgical vessel including an outer casing;
Refractory lining disposed toward the inside of the metallurgical vessel;
Cooling element according to any one of claims 1 to 4
Including;
And said cooling element is embedded in a thermally conductive contact mass disposed between said refractory lining and said outer casing. During the normal operation of the furnace, in particular without sacrificing the static and stability of the region of the lower butt surface, the cooling element comprises a cooling element according to any of the preceding claims, wherein the cooling element is circular, rectangular and elliptical. A metallurgical apparatus, characterized in that it is placed in a metallurgical furnace in the shape of any one of.

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