JP2011511257A - Cooling device for cooling refractory lining of 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

  The present invention relates to a cooling device for cooling a refractory lining of a metallurgical furnace.

  The cooling device known from Patent Literature 1 and Patent Literature 2 includes a plate made of copper or a copper alloy facing a refractory lining of a metallurgical furnace such as a blast furnace, and this plate has a passage for guiding a coolant inside. I have.

  A disadvantage of such a cooling device is that the parts facing the furnace interior space allow the coolant, generally water, to flow through and the water reaches the furnace interior in the event of a failure or leak. This is associated with significant danger.

European Patent Application No. 887428 German Patent Application No. 102004035968

  The object of the present invention is to provide a cooling device which does not present such a potential danger in a comparable good cooling action.

  According to the present invention, a cooling plate facing a fireproof lining, a heat transfer plate that is bent at a right angle to the cooling plate and is firmly coupled and extends outward from the furnace wall, and a cooling plate and a heat transfer plate are provided. It is solved by being composed of solid material and by a coolant passage that is firmly connected to the heat transfer plate and connected to the coolant inlet and the coolant outlet.

  The cooling plate, the heat transfer plate and the coolant passage are made of a highly heat transfer material, such as copper or a copper alloy, and the coolant passage preferably extends along the short side surface of the heat transfer plate.

  Due to the high heat transfer of the cooling device, in the region between the refractory lining and the steel plate of the furnace vessel, so much heat is removed that it is no longer necessary to cool the furnace vessel from the outside with spray water or passage cooling (drying) Furnace vessel). The cooling device can be composed of a rolled, forged and / or cast copper plate with a fine grain structure for good heat transfer. According to one proposal of the invention, two such solid copper plates can be welded together (bonded in a heat-conducting manner) or folded into a T-shape (also an L-shape). The end of the welded copper plate is also welded with a copper tube as a coolant passage. The copper tube is cooled with cooling water and provides sufficient cooling of the furnace vessel brickwork in the mounting area via connected copper plates.

  The dimensions, number per unit area, cooling circuit, and interval of the heat transfer plate extending out of the furnace vessel are calculated and determined according to the required amount of exhaust heat. In order to monitor the temperature and / or the amount of exhaust heat, the cooling device is equipped with corresponding measuring equipment.

  The cooling device can be mounted between the brickwork and the vessel steel wall, lid and / or bottom at any position of the furnace vessel (lid, side wall and / or bottom, horizontal or vertical). Preferably, these coolers are refractory linings and furnace vessel sheet steel in the lower and / or central region of the vessel sidewall (even in the liquid region of metal and / or slag, support region, or gas region in the case of a DC furnace). It is arranged between. Even if the cooling device is arranged in the support area of the brickwork, the reinforcing material arranged in this portion of the furnace vessel is not damaged. The cooling device can be coupled to the furnace vessel by bolts or the like. A thermally conductive contact material is compacted between the cooling device and the brickwork.

  The cooling device is supplied with cooling water via a copper tube welded on the outside. The water-cooled parts of the cooling device are arranged outside the furnace vessel. Thus, in the case of a water leak, the water does not reach the furnace and endanger the furnace. A plurality of cooling devices are arranged side by side and interconnected to one cooling circuit. However, the individual positioning is chosen so that the areas next to it will continue to be indirectly cooled in the event of a cooling circuit failure. Preferably, the cooling device should be connected to a closed cooling circuit. However, if a semi-closed cooling system or an open cooling system should be provided at the time of modification, the cooling system shall be installed in such a system when the quality of the cooling water and the suspended solids content are within defined tolerances (quality). It can also be connected.

  The advantages achievable with the cooling device according to the invention can be summarized as follows. Improvement by achieving a completely dry furnace vessel. Improved exhaust heat compared to spray cooling and / or surface cooling. Also available in areas where static requirements must be maintained in the furnace vessel. Only small holes are required in the furnace vessel compared to other systems, which positively affects the stability and correlation of the lower and / or upper vessel. The amount of heat exhausted through the chiller is sufficient to protect the contained components from breakage and the inner surface facing the process to solidify and cool, or to be self-protected from less reactive products. It is also done.

  Furthermore, if a furnace vessel that is dry on the outside should be achieved, especially dirt (sulfur and / or dust) is excessively large, and corrosion of the furnace vessel skin and cooling water failure due to pump clogging make the furnace difficult to operate. In this case, various advantages can be obtained. The cooling device is not in direct contact with the process or product (slag and / or metal), but can be successfully combined with other copper cooling systems not provided in areas critical to the static performance of the furnace vessel be able to. This cooling device is also particularly suitable for furnace container locations that are difficult to access, especially for the bottom compartment of rectangular containers that have traditionally been relied upon for open spray cooling. This cooling device is available in AC / DC reduction furnaces with rectangular and circular furnace vessels. The latter case is particularly advantageous because the reactor vessel hydrostatic performance and / or stability is not impaired by the type, shape and mounting position.

  An embodiment of a cooling device according to the present invention will be described below with reference to the drawings.

It is a perspective view of a cooling device. The arrangement structure of the cooling device in the furnace wall is shown. An arrangement structure in a circular furnace vessel is shown. Fig. 3 shows the arrangement structure in a rectangular furnace vessel combined with another system.

  The cooling device includes a cooling plate 1, a heat transfer plate 2, and a coolant passage 3 coupled to the heat transfer plate, and further includes a coolant inlet 4 and a coolant outlet 5. In order to achieve the highest possible heat transfer properties, these parts are all made of copper or a corresponding copper alloy.

  As shown in FIG. 2, the cooling plate 1 is directly provided between the outer jacket of the metallurgical vessel 6 and the refractory lining 7 facing the furnace interior space. Preferably, the cooling plate is embedded in a heat conductive contact material 8 formed by tamping.

  As for the arrangement structure of the cooling plate 1, the heat transfer plate 2, and the coolant passage 3, FIG. 3 shows an example attached to a circular furnace vessel, and FIG. 4 shows an example attached to a rectangular furnace vessel. The figure suggests a system for yet another cooling device.

  As clearly shown in the figure, the coolant passage is located outside the furnace vessel and can be referred to herein as a drying oven vessel.

Claims (7)

In the cooling device for cooling the refractory lining of the metallurgical furnace,
A cooling plate (1) facing the refractory lining;
A heat transfer plate (2) that is bent at a right angle to the cooling plate (1) and is firmly coupled and extends out of the furnace wall;
The cooling plate (1) and the heat transfer plate (2) are made of solid material,
Cooling device characterized in that it is provided with a coolant passage (3) which is firmly coupled to the heat transfer plate (2) and is coupled to a coolant inlet (4) and a coolant outlet (5). .   The cooling according to claim 1, characterized in that the cooling plate (1), the heat transfer plate (2) and the coolant passage (3) are made of a highly heat transfer material such as copper or a copper alloy. apparatus.   The cooling device according to claim 1 or 2, characterized in that the coolant passage (3) extends along a short side surface of the heat transfer plate (2).   The cooling device according to any one of claims 1 to 3, wherein the cooling device is made of a highly heat-conductive rolling, forging and / or casting material such as a copper plate having a fine grain structure.   The said cooling plate (1) and the said heat-transfer plate (2) are mutually welded by heat conduction type, or bend | folded correspondingly, and are comprised as a T-shaped material or an L-shaped material, The cooling device as described in any one of 1-4. In the arrangement structure of the cooling device according to any one of claims 1 to 5, in a metallurgical vessel having an outer jacket and a refractory lining facing the inside of the vessel,
Arrangement structure, characterized in that the cooling device is embedded in a heat conductive contact material charged between the lining and the outer jacket.   7. Especially provided in a metallurgical furnace vessel of circular, square, elliptical or similar shape without compromising static performance and / or strength in the region of the bottom support during normal operation. Cooling device arrangement structure.

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