1 Today's mine furnace cover The current mine furnace cover usually adopts the cooling method of cooling only the skeleton, and the other places are not water-cooled. The structural form is shown in Figure 1. The annular water-cooled skeleton generally has 2 to 3 channels. The number of radiation skeletons depends on the size of the furnace cover. The cross-section of the skeleton water is rectangular, the skeleton is cooled by water, and the steel plate is not cooled. Figure 1 Current structure of the ore furnace cover for common applications Since the heat radiation temperature of the arc of the electrode is very high, and the water cover is not taken in most places of the furnace cover, the temperature of the furnace cover near the combustion zone of the furnace is too high, and the portion without water cooling is quickly ablated, greatly shortening the furnace cover. The service life. 2-tube water-cooled furnace cover In order to solve the above problems, this paper adopts the structural form of tubular water-cooled block, and the structure is shown in Figure 2. Figure 2 Pipe-type water-cooled furnace cover structure In Fig. 2, the annular water cooling ring and the steel pipe radiated from the center to the periphery constitute a skeleton of the furnace cover, and the skeleton functions to support the weight of the water cooling block on the entire furnace cover. Therefore, the strength of the skeleton must be checked during design. The cross-sectional shape of the water-cooled skeleton may be a circular shape or a rectangular shape. Considering that the circular cross-section is relatively strong, a steel pipe having a circular cross-section is used as the water-cooled skeleton. In this type of structure, the water-cooled skeleton also has a function as a water dispenser, that is, the water coming from the total water inlet pipe is directly connected to the water-cooled skeleton, and the water-cooled skeleton serves as a water-cooling block, a flue, and a control of the water distributor to the furnace cover. The water-cooled cone ring, protective cover and lid seal of the system are supplied with water. This has the advantage of saving the water dispenser, especially since the water cooling block is distributed around the furnace cover. If the water distributor is separately set up, the arrangement of the water distributor is difficult, and the water distributor set up on the furnace cover affects the inspection operation above the furnace cover. . 3 water cooling block In order to facilitate the disassembly, the water-cooling block adopts a block type, that is, one or two channels of water in the same section form a water-cooling block, as shown in FIG. Figure 3 water cooling block structure The block of the water-cooled block is determined according to the partition of the water-cooled skeleton, and one zone has at least one water-cooled block. Moreover, the same water-cooling block generally does not span, for example, the water-cooled skeleton is divided into six zones, and the water-cooled block is divided into six large blocks, or an integral multiple of six. The water inflow of each water block is introduced from the water-cooled skeleton, as shown in Figure 4. Figure 4 Schematic diagram of water cooling block water supply The return water of the water-cooled block can be returned to the return tank separately, or it can be collected and returned to the return tank. The advantage of returning water alone is that it is very intuitive to know the condition of each water. If a certain road is blocked, the operator can find it in time. If you want to reduce the number of return pipes, you can also collect the return water and return to the return tank. At this time, you need to pay attention to the flow monitoring in each return water to know the water condition of each road. If there is no flow monitoring at this time, when a certain road suddenly fails, the operator has no way to find it in time. 4 water cooling block fixing method The water-cooling block is fixed on the water-cooled frame by hanging, and the fixing method is as shown in FIG. 5. One of the hanging plates is welded with the water-cooling block, the other hanging plate is welded with the water-cooled frame, and the two hanging plates are fixed by the pin shaft, and the number of hangings of each water-cooling block is determined according to the size of the water-cooling block. set. Generally, the number of each water-cooling block is not less than 10. Figure 5 water cooling block hanging When the water-cooled block burns out, as long as the pin is withdrawn, the water-cooled block can be taken out from under the skeleton and replaced with a new water-cooled block. The advantage of this structure is that when the water-cooling block is burned out, the water-cooling block of the entire water-cooled furnace cover is not replaced, and only the partial small water-cooling block needs to be replaced, which greatly saves the cost and reduces the time for the replacement of the water-cooling block. Increased production efficiency. 5 Conclusion Through the improvement of the water-cooling structure of the submerged arc furnace, the cooling effect of the furnace cover of the submerged arc furnace is better, the ablation speed of the furnace cover is reduced, and the normal operation time of the equipment is improved, thereby improving the efficiency of the enterprise. Li Dongwen  Lin ZHU MCC Group  Xi'an Electric Furnace Research Institute Co.
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Structural reformation plan for long-life water-cooled furnace cover of submerged arc furnace
Water-cooled furnace covers are widely used in electric arc furnaces, and today there are many manufacturers that integrate design and manufacture. Since the submerged arc furnace is generally operated by submerged arc, the temperature at the furnace cover is not high at the temperature of the furnace cover, so people do not pay attention to the cooling of the water-cooled furnace cover. The structure of the water-cooled furnace cover used in the submerged arc furnace is relatively primitive, the cooling method is unreasonable, and the cooling effect is poor. However, in the refining furnace type of the submerged arc furnace, the final melting stage is an open arc operation, and the amount of heat radiation is large, and the original water-cooled furnace cover structure cannot meet the process requirements. In order to improve the cooling effect of the water-cooled furnace cover of the submerged arc furnace, the service life of the furnace cover is improved. This paper proposes to improve the structure of the water-cooled furnace cover of the submerged arc furnace. The structure and hanging method of the detachable water-cooled furnace cover of the submerged arc furnace in this paper have been patented in 2008.