JP4644068B2 - Cooled water cooling method and cooling device - Google Patents

Description

  The present invention relates to a cooling method and a cooling device for granulated water used in a granulating tank in which slag discharged from a melting furnace such as a waste melting furnace is charged and cooled.

  Normally, the slag discharged from the melting furnace is put into a granulation tank, cooled by the granulated water in the granulation tank and made into granulated slag, but the granulated water in the granulation tank is heated by the heat of the slag. As it rises, it needs to be cooled.

  Conventionally, as a cooling method of granulated water, for example, there is one described in Patent Document 1. This is a separate water cooling tank equipped with a multi-tubular cooler that indirectly cools the granulated water, and cools the cold water by circulating the granulated water between the water cooling tank and the water cooling tank. It is. However, in the method of Patent Document 1, it is necessary to separately provide a water cooling tank, and since a pipe between the water granulating tank and the water cooling tank is also required, there is a problem that the equipment cost increases.

  On the other hand, the cooling method of the granulated water as shown in FIG. 6 is also examined. In this method, a multi-tube type cooler 100 for indirectly cooling the granulated water is installed in the granulating tank 2, a water flow is generated by the stirring blower 101, and the water is cooled by the water flow. According to this method, it is not necessary to provide a separate water cooling tank, and piping between the water granulating tank and the water cooling tank is not necessary.

However, the cooling method shown in FIG. 6 has the following problems. First, since the water flow of the stirring blower 101 is dispersed on the surface of the cooler 100 and does not reach the inside, there is a problem that the cooling efficiency is poor. In addition, since the water flow inside the cooler 100 is weak, slurry such as slag or mud in crushed water (high concentration slurry water) adheres to the surface of the cooling pipe inside the cooler 100, and the cooling pipe becomes dirty and heat transfer efficiency is improved. There was also the problem of getting worse. Furthermore, in order to increase the size, it is necessary to increase the number of stirring blowers 101, which is a heavy burden in terms of cost. In addition, it is difficult to reproduce the convection of a small type of granulated water with a proven track record, and there is a problem that it is difficult to increase the size and cost to reproduce the conditions based on the results.
Japanese Patent Laid-Open No. 10-5616

  The problem to be solved by the present invention is to provide a cooling method and a cooling device for granulated water that can increase the cooling efficiency at low cost.

The method for cooling granulated water according to the present invention is a method for cooling granulated water used in a granulating tank in which slag discharged from a melting furnace is charged and cooled, between the opposing walls of the granulating tank. A plurality of partition walls are arranged at predetermined intervals and protruded from the water level of the granulation tank, and a cooler for indirectly cooling the granulated water is disposed between the partition walls to surround the cooler. At the same time, the granulated water is jetted from above the cooler, so that the slurry in the granulated water can easily escape downward from the cooler by the downward flow of water and the force of gravity.

  Thus, by disposing the cooler between the partition walls, dispersion of the granulated water sprayed from above the cooler is prevented, and the cooler does not flow out in the middle of the cooler. All of the crushed water supplied to the water passes through the cooler. Thereby, the cooling efficiency of the granulated water by a cooler improves, and a cooler can be reduced in size. In addition, since all of the granulated water passes through the cooler, to achieve the same cooling efficiency, the pump can be reduced in size because less power is required to inject the granulated water from above the cooler. it can.

  Furthermore, by disposing a cooler between the partition walls, analysis calculation such as convection of granulated water is facilitated, and an increase in size can be realized at a low cost based on a proven small type.

  It is preferable that the partition wall is disposed over the entire space between the opposing walls of the granulating tank so that the cooler is completely surrounded by the partition wall and the wall of the granulating tank. Thereby, dispersion / outflow of the granulated water can be surely prevented.

  In addition, the partition wall is arranged in the vertical direction, preferably in the vertical direction, and by spraying the granulated water from above, the slurry in the granulated water easily falls below the cooler by the downward water flow and the force of gravity. It is possible to prevent the slurry from adhering to and depositing on the cooler.

  Furthermore, the partition wall is arranged so as to protrude from the water level of the granulation tank, and the water level in the partition wall and the water level in the granulation tank are changed. By setting so as to make it easier for the water to pass through the cooler due to the head pressure due to the water level difference, the cooling efficiency is improved and the adhesion and accumulation of slurry on the cooler can be reliably prevented. In addition, since the head pressure due to the difference in water level can be used as power for passing the water through the cooler, the pump discharge pressure for injecting water from the top of the cooler can be reduced, and the pump can be downsized. it can.

On the other hand, the granulated water cooling device according to the present invention is a granulated water cooling device used in a granulated water tank for cooling slag discharged from a melting furnace, between the opposing walls of the granulated water tank, A plurality of partition walls are arranged at predetermined intervals and protruded from the water level of the granulation tank, and a cooler for indirectly cooling the granulated water is disposed between the partition walls to surround the cooler. The spray nozzle for injecting the granulated water from above the cooler is disposed, and the slurry in the granulated water is easily discharged downward from the cooler by the downward water flow and the force of gravity. is there.

  In this cooling device, the partition wall is preferably installed so as to be openable and closable. As a result, it becomes possible to perform maintenance of the cooler by opening the partition wall, thereby improving maintainability.

  The cooler may be a so-called multi-tube cooler configured by connecting a plurality of cooling pipes between the cooling water headers at both ends. Of this cooler, the connection plate and the cooling pipe, which are parts that particularly require corrosion resistance, specifically, the part that connects the cooling pipe to the cooling water header, can be made of stainless steel. As a result, the corrosion resistance of the cooler can be improved, and an increase in cost can be suppressed by using an inexpensive steel material for parts other than the connecting plate and the cooling pipe that do not require much corrosion resistance.

  As described above, according to the present invention, the cooling efficiency of the granulated water by the cooler can be improved, and adhesion and accumulation of slurry on the cooler can be prevented.

  In addition, the cooler and the pump for injecting the granulated water from above the cooler can be reduced in size, and a cost town can be achieved.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is a schematic cross-sectional view of a slag granulation treatment apparatus to which a cooling apparatus for granulated water according to the present invention is applied, and FIG. 2 is an enlarged view of a cooling device portion shown in FIG.

  In FIG. 1, slag discharged from the melting furnace 1 is charged into a granulation tank 2 and cooled by granulated water 3 in the granulation tank 2 to become granulated slag. The granulated slag is discharged from the discharge port 5 by the scraper conveyor 4.

  Since the temperature of the granulated water 3 is increased by the heat of the slag, it needs to be cooled. Therefore, in the present invention, a plurality of partition walls 6 are arranged in the vertical direction at predetermined intervals in the granulating tank 2, and a cooler 7 for indirectly cooling the granulated water is disposed between the partition walls 6. Set up. Then, the crushed water is sucked up by the submersible pump 8 or the circulation pump 9, and the crushed water is sprayed from the spray nozzle 10 disposed above the cooler 7 to cool the crushed water.

  The circulation pump 9 is originally intended to circulate the granulated water to the slag charging part when the slag is granulated, but is used only during the slag charging (about 15 min / h). By closing the valve 11 and opening the valve 12, the crushed water can be circulated to the cooler 7 side. By switching the granulated water line in this way, the circulation pump 9 can be used effectively, and the submersible pump 8 can be omitted in some cases.

  Hereinafter, the detailed structure of the above-mentioned partition wall 6 and the cooler 7 is demonstrated.

  3 is a view taken along the line AA in FIG. 2, FIG. 4 is a view taken along the line BB in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line CC in FIG.

  The partition wall 6 is disposed over the entire space between the opposing walls 2a and 2a of the water granulating tank 2, and the partition wall 6 and the walls 2a and 2a of the water granulating tank 2 completely surround the cooler 7. To surround. As shown in FIG. 4, the partition wall 6 includes two wall plates 6 a and 6 b, and the wall plates 6 a and 6 b are pivotally supported on the wall 2 a side of the granulating tank 2 so as to be rotatable. Thereby, the partition wall 6 can be opened and closed by a so-called double door system.

  On the other hand, as shown in FIG. 3, the cooler 7 is configured by connecting a plurality of cooling pipes 7c between cooling water headers 7a and 7b at both ends. The cooling water headers 7a and 7b at both ends are respectively disposed inside the walls 2a and 2a of the granulating tank 2, and the connecting portion with the cooling pipe 7c is a connecting plate 7d with a hole corresponding to the cooling pipe 7c. Is arranged. In the cooler 7, only the connecting plate 7d and the cooling pipe 7c are made of stainless steel.

  The cooling water is supplied from a water supply port 7e provided in one cooling water header 7a, and flows into the other cooling water header 7b through the cooling pipe 7c. Then, it returns to the cooling water header 7a again through the cooling pipe 7c. By repeating this, the cooling water always flows in the cooling pipe 7c to indirectly cool the granulated water. And finally, it discharges | emits from the drain port 7f provided in the cooling water header 7a.

  In the above configuration, in order to cool the crushed water in the pulverized tank 2, the crushed water is sucked up by the submersible pump 8 or the circulation pump 9 as described above with reference to FIGS. The crushed water is sprayed from a spray nozzle 10 disposed above the cooler 7. Thereby, the granulated water is indirectly cooled by the cooling pipe 7 c of the cooler 7. At this time, since the cooler 7 is disposed between the partition walls 6, the dispersion of the granulated water is prevented, and the water supplied to the cooler 7 without the granulated water flowing out in the middle of the cooler 7. Since all the crushed water passes through the cooler 7, the cooling efficiency is improved. Further, since the granulated water is jetted from above the cooler 7, the slurry in the granulated water can easily escape downward from the cooler 7 due to the downward flow of water and the force of gravity, and the coolant 7 enters the cooling pipe 7 c of the cooler 7. Slurry adhesion and deposition are prevented. The dropped slurry is discharged from the discharge port 5 by the scraper conveyor 4 together with the granulated slag.

  In addition, as clearly shown in FIG. 2, in this embodiment, the partition wall 6 is disposed so as to protrude from the water level L1 of the granulation tank, and the water level L2 in the partition wall 6 is higher than the water level L1 in the granulation tank. Therefore, the crushed water is more likely to pass through the cooler 7 due to the head pressure due to the water level difference, and the cooling efficiency is improved and the adhesion and accumulation of slurry on the cooler 7 are surely prevented. The

  When performing maintenance such as cleaning of the cooler 7, as described with reference to FIG. 4, the wall plates 6 a and 6 b of the partition wall 6 are opened by a double-opening method.

It is a schematic sectional drawing of the slag granulation processing apparatus to which the cooling apparatus of the granulated water which concerns on this invention is applied. It is an enlarged view of the cooling device part shown in FIG. It is an AA arrow directional view of FIG. It is a BB line arrow directional view of FIG. FIG. 4 is a view taken along the line CC in FIG. 3. It is a schematic diagram which shows the cooling method of the conventional granulated water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Melting furnace 2 Granulated tank 3 Granulated water 4 Scraper conveyor 5 Discharge port 6 Partition wall 6a, 6b Wall plate 7 Cooler 7a, 7b Cooling water header 7c Cooling pipe 7d Connecting plate 7e Water supply port 7f Drain port 8 Submersible pump 9 Circulation pump 10 Injection nozzle 11, 12 valve

Claims (4)

In the cooling method of the granulated water used in the granulating tank that is charged with slag discharged from the melting furnace and cooled,
Cooling that indirectly cools the granulated water between the partition walls by arranging a plurality of partition walls at predetermined intervals between the opposing walls of the granulation tank and projecting from the water level of the granulation tank. And surrounding the cooler, spraying the granulated water from the upper side of the cooler so that the slurry in the granulated water can easily come out below the cooler by the downward flow of water and the force of gravity. A method for cooling granulated water. In the cooling device for the granulated water used in the granulating tank for cooling the slag discharged from the melting furnace,
Cooling that indirectly cools the granulated water between the partition walls by arranging a plurality of partition walls at predetermined intervals between the opposing walls of the granulation tank and projecting from the water level of the granulation tank. And a spray nozzle for injecting granulated water from above the cooler so that the slurry in the granulated water can be removed from the cooler by the downward flow of water and the force of gravity. A device for cooling granulated water, characterized in that it is easily removed downward.   The said partition wall is installed so that opening and closing is possible, The cooling device of the granulated water of Claim 2 characterized by the above-mentioned.   The cooling device according to claim 2 or 3, wherein the cooler is configured by connecting a plurality of cooling pipes between cooling water headers at both ends.

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