JP2011075184A - Water-cooled jacket, and furnace body cooling structure and method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-cooled jacket dispensing with the replacement of refractories and the water-cooled jacket over many years, and also to provide a furnace body cooling structure and method using the water-cooled jacket. <P>SOLUTION: The water-cooled jacket 10 is equipped with: a jacket body 20 having a cooling water passage 11 inside; a plurality of cooling protrusions 30 arranged at the jacket body 20 to project toward the inside of a furnace; and cooling fins 34 arranged to connect the adjacent cooling protrusions 30 to each other and formed projecting in a length shorter than the projecting length of the cooling protrusions 30. The space between the cooling protrusions 30 and the cooling fins 34 is filled with the refractories 35, 37 without clearances, and the cooling protrusions 20 and cooling fins 40 themselves are coated with the refractories 37 to cover at least the ends of the cooling protrusions 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water cooling jacket, and a furnace body cooling structure and a furnace body cooling method using the same, and more specifically, a furnace body that is exposed to a high temperature, such as a copper smelting furnace, is efficiently cooled, and thereby the furnace body The present invention relates to a water-cooling jacket capable of significantly reducing the refractory replacement and repair by suppressing melting damage of the refractory constituting the same, and a furnace body cooling structure and a furnace body cooling method using the same.

  For example, there is a flash furnace as one of the smelting furnaces. As shown in FIG. 7, the flash smelting furnace 1 includes a shaft 2, a setter 3, and an uptake 4, and a concentrate burner 7 is arranged on the top of the shaft 2. The raw material charged together with the solvent and the like from the concentrate burner 7 reacts with the reaction gas supplied from the concentrate burner 7 into the furnace in the shaft 2 to produce mat, slag and gas. The mat and slag fall in the shaft 2 and are separated into a slag 5 and a mat 6 in a layered manner at the hearth by the difference in specific gravity. The slag 5 and the mat 6 thus generated are appropriately extracted from a plurality of tap holes (not shown) formed in the setter 3. Since the hot water depth fluctuates due to this extraction, the temperature change associated therewith is large, and a particularly severe thermal load is applied to the furnace wall refractory in the setter 3 part.

  In addition, the portion immediately below the shaft 2 is a place where the hot mat, slag and gas generated by the oxidation reaction of the raw material and the reaction gas first pass and contact, and when the input of the raw material is temporarily stopped Since the gas whose temperature has decreased is the first passage, it is a place where the thermal fluctuation load is large even at the ambient temperature.

  Therefore, it has been proposed to arrange a water-cooling jacket for cooling the furnace wall portion having a large temperature change to cool the refractory constituting the furnace wall, thereby suppressing the heat load of the refractory. (For example, patent document 1).

  The furnace body water cooling jacket shown in Patent Document 1 has a cooling water passage inside, and has convex portions and concave portions arranged alternately in a line on the surface, and the concave portion is a powdery refractory type different from the refractory in the furnace. The surface of the furnace water cooling jacket with the castable refractory side faces the furnace wall that is constructed by placing castable refractories adjacent to the outside of the furnace wall constructed by stacking refractory bricks. By arranging in such a manner, the convex part is in direct contact with the furnace wall refractory for cooling, and the concave part is intended to cool the furnace wall refractory indirectly through the filled refractory. In addition, the height of a convex part is 10-30 mm.

  Further, in the furnace body water cooling structure disclosed in Patent Document 2, a large number of copper rods are arranged at intervals of approximately 60 mm from the surface of a steel outer shell having a water channel inside, and the tip of the copper rod is disposed on the surface of the outer shell. Is covered with a fireproof lining. Heat applied to the furnace inner surface (heating surface) of the refractory lining is transmitted to the outer shell by the copper rod, and the furnace body is cooled by cooling water flowing through the water channel. And the diameter of this copper rod is the range from a fraction of 1 mm to 25 mm, and since removal of the target heat from a furnace becomes difficult, it is supposed that the diameter exceeding it is not preferable.

Japanese Patent No. 4064387 Japanese National Patent Publication No. 10-501877, page 9, lines 11 to 15

  As in Patent Document 1, the solution holding part and the high temperature gas contact part in the smelting furnace are formed of a refractory surface in contact with the molten metal and the high temperature gas, and the refractory is cooled from the outside of the furnace with a water cooling jacket. Mainstream. However, when the cooling to the refractory is insufficient, the refractory is melted and there is an opportunity for the water cooling jacket to come into direct contact with the solution and the hot gas. If the water cooling jacket and the molten metal are in direct contact with each other due to melting of the refractory, the water cooling jacket itself is reduced in thickness, causing trouble of water leakage into the furnace. Therefore, it was necessary to replace and restore refractories regularly during regular repairs. In particular, in a high load portion, the wear rate of the refractory is fast, and the water cooling jacket is forced to operate in direct contact with the molten metal for a long time, and there is a concern about shortening the life of the water cooling jacket.

  Moreover, the water-cooled jacket of the cited document 1 is not a structure that actively cools the refractory in the furnace, but forms a slag self-coating layer on the jacket surface after the refractory in the furnace is melted and holds it. It is designed mainly to protect the water cooling jacket itself. However, if contact between the molten metal and the jacket is repeated due to the loss of self-coating that frequently occurs due to fluctuations in the thermal load during operation, the water cooling jacket itself gradually loses its thickness, so that the water cooling jacket can be removed before water leakage from the water cooling jacket occurs. Need to be updated.

  As described above, since the water-cooled jacket of Patent Document 1 does not always have sufficient cooling to the refractory, the thickness of the water-cooled jacket due to the refractory is damaged. For this reason, it has been necessary to renew refractories in regular repairs every year and to renew water-cooled jackets every 2-6 years depending on the installation area. Here, when replacing the water-cooling jacket, as described above, the refractory bricks are stacked inside the furnace of the water-cooling jacket, so it is necessary to remove the refractory bricks that have been melted and to stack new refractory bricks. It was a work that required a construction period.

  Further, in recent years, a high-load operation of a smelting furnace has been performed in order to increase the throughput per hour as compared with the prior art, and the cooling function of the furnace body water cooling structure disclosed in the cited document 2 does not sufficiently exhibit the cooling function. There is a fear. In particular, in high-load operation, the refractory lining exposed to high temperatures is severely melted, and the copper rod disclosed in the cited document 2 has a risk of rapid progress of melting and may not be able to be expected to have a sufficient cooling effect. Then, there is a possibility that the molten metal directly contacts the steel outer shell provided with the cooling water channel.

Therefore, an object of the present invention is to provide a water cooling jacket that eliminates the need to replace the refractory and the water cooling jacket for many years, and a furnace body cooling structure and a furnace body cooling method using the water cooling jacket.
In addition, the present invention eliminates the need for replacement of refractories and water-cooled jackets over a long period of time, at least six years, in the solution holding part (lower shaft, side surface of setter, lower part of uptake) and high temperature gas contact part It is an object of the present invention to provide a water cooling jacket, a furnace body cooling structure and a furnace body cooling method using the same.

  In order to achieve the above object, the invention according to claim 1 is adjacent to a jacket main body provided with a cooling water channel therein and a plurality of cooling protrusions arranged on the jacket main body so as to protrude toward the inside of the furnace. The cooling protrusions are arranged so as to connect the cooling protrusions, and are formed to protrude with a length shorter than the protruding length of the cooling protrusions, and the refractory is filled with no gap between the cooling protrusions and the cooling fins. In addition, a water cooling jacket is provided in which the cooling protrusions and the cooling fins themselves are covered with a refractory so that at least the tips of the cooling protrusions are covered.

  In order to achieve the above object, the invention described in claim 2 is the water-cooling jacket according to claim 1, wherein the water-cooling jacket is divided into a plurality of parts in the vertical direction.

  To achieve the above object, according to a third aspect of the present invention, in the water-cooling jacket according to the first or second aspect, the cooling protrusion and the cooling fin are formed by integral casting with the jacket body, and the cooling protrusion and the cooling fin are inside. The cooling protrusions and cooling fins are cooled by heat conduction by disposing the cooling passages only inside the jacket body, and when the refractory is melted, the space between the cooling protrusions and the cooling fins is connected to the jacket body. It is characterized in that the solution proceeding toward the surface is solidified so that the jacket body provided with the cooling water channel does not directly contact the solution.

  In order to achieve the above object, the invention according to claim 4 is the water cooling jacket according to any one of claims 1 to 3, wherein one or more for grasping the progress degree of the erosion of the cooling protrusion and the cooling fin. The temperature of the cooling protrusion is constantly monitored by analyzing the temperature measured by the thermocouple using a computer.

  In order to achieve the above object, the invention according to claim 5 utilizes a water cooling jacket characterized in that the water cooling jacket according to any one of claims 1 to 4 is arranged as a furnace wall of a smelting furnace. A furnace body cooling structure is provided.

  In order to achieve the above-mentioned object, the invention according to claim 6 is arranged such that the water-cooling jacket according to any one of claims 1 to 4 is arranged as a furnace wall of the smelting furnace, and the cooling water is caused to flow through the cooling water channel. Provided is a furnace body cooling method using a water cooling jacket characterized by cooling an operating furnace wall.

  According to the water cooling jacket and the furnace body cooling structure and the furnace body cooling method using the water cooling jacket according to the present invention, the jacket main body having the water channel is provided with cooling protrusions and cooling fins that function as refractory cooling and erosion allowances. Therefore, there is an effect that it is possible to extend the life of the refractory by suppressing the progress of the refractory melting as much as possible.

  Further, according to the water cooling jacket and the furnace body cooling structure and the furnace body cooling method using the same according to the present invention, the cooling protrusion and the cooling fin should be melted and the solution has progressed to the area where the cooling fin exists. In addition to the remaining cooling protrusions, the cooling fins efficiently cool and solidify the solution, thereby preventing the solution from coming into direct contact with the jacket body. This prevents the occurrence of water leakage troubles in the water cooling jacket and contributes to long-term stable operation of the smelting furnace.

  Further, according to the water cooling jacket and the furnace body cooling structure and the furnace body cooling method using the same according to the present invention, the refractory is actively cooled by the jacket main body, the cooling protrusion and the cooling fin. There is an effect that renewal and renewal of the water cooling jacket are unnecessary for many years, and refractory renewal of the high-load portion of the smelting furnace, which has been carried out every year so far, is unnecessary for a long period of at least 6 years. Therefore, there is an effect that the furnace life is extended, the furnace repair work can be shortened, and the continuous operation period can be extended.

It is a rear view which shows the furnace outer side of one Embodiment of the water cooling jacket which concerns on this invention. It is a top view of the water cooling jacket shown in FIG. It is side surface sectional drawing of the state which has arrange | positioned the water cooling jacket shown in FIG. 1 to the flash smelting furnace which is a typical smelting furnace. It is a front view of 1 unit of a divided water cooling jacket. FIG. 5 is a perspective view showing one unit of the divided water cooling jacket shown in FIG. 4. It is a cross-sectional view of a flash furnace. It is explanatory drawing of the temperature monitoring by a thermocouple.

  Hereinafter, a water cooling jacket according to the present invention, and a furnace body cooling structure and a furnace body cooling method using the jacket will be described based on a preferred embodiment. FIG. 1 is a rear view showing the furnace outer side of one embodiment of the water cooling jacket according to the present invention, and FIG. 2 is a plan view of the water cooling jacket shown in FIG.

  The illustrated water cooling jacket 10 generally includes a jacket body 20 having a cooling water channel 11 therein, and a plurality of cooling protrusions 30 formed so as to protrude from the surface of the jacket body 20 as shown in FIG. The cooling fins 34 are arranged so as to connect adjacent cooling protrusions 30 to each other. The jacket main body 20, the cooling protrusions 30, and the cooling fins 34 are formed by integrally casting the jacket main body 20 with a metal pipe serving as the cooling water channel 11 inside. The jacket main body 20, the cooling protrusions 30, the cooling fins 34, and the metal pipes used as the cooling water channels 11 are formed of a metal having high thermal conductivity, for example, copper, and the refractory 35 and the like described later, which are filled in the jacket main body 20. The regular refractory 37 is efficiently cooled. Since the water cooling jacket 10 constitutes a furnace wall, the upper side is inclined slightly toward the outside in accordance with the outer shape of the furnace.

  As shown in FIG.1 and FIG.2, in this embodiment, the water cooling jacket 10 is comprised by mutually connecting the water cooling jacket 10a, 10b, 10c divided | segmented into 3 in the vertical direction. In addition, in each of the jacket main bodies 20a, 20b, 20c of the water cooling jackets 10a, 10b, 10c, a large number of cooling protrusions 30 are regularly and vertically evenly across almost the entire surface located inside the furnace of the jacket main bodies 20a, 20b, 20c. Has been placed. In this embodiment, the cooling protrusions 30 are formed in a columnar shape, and are arranged in three rows in the vertical direction and eight rows in the horizontal direction, but the present invention is not limited to this. The arrangement, the number, the diameter, the length, and the shape are not limited to this as long as the required cooling efficiency is satisfied and the refractory to be described later can be easily held. What is necessary is just to arrange | position so that the thing 37 may be cooled efficiently. Specifically, the cooling protrusion 30 may have a circular cross section, an elliptical shape, a quadrangular shape, a polygonal shape, a star shape, a heart shape, or the like, and a shape with a thick or thin tip side. It may be.

  The cooling protrusions 30 and the cooling fins 34 have their shapes and sizes as melting allowances in consideration of the degree of melting damage in accordance with the target renewal period of the refractory 35, the irregular refractory 37 and the water cooling jacket 10. It is preferable to determine. That is, the cooling protrusions 30 and the cooling fins 34 play an important role for actively cooling the refractory 35 and the irregular refractory 37, but the refractory 35 and the irregular shape no matter how much the cooling is enhanced. It is physically very difficult to maintain the refractory 37 and the cooling protrusion 30 semipermanently without causing any melting damage. Therefore, in the present embodiment, the refractory 35, the irregular refractory 37, and the cooling protrusion 30 due to continuation of operation are considered to be at least about half the protrusion length of the cooling protrusion 30 as a erosion allowance. In order to prevent melting damage, the cooling fins 34 having a projection length that is approximately half of the cooling protrusion 30 are arranged in a mesh shape so as to connect the cooling protrusions 30 and 30 adjacent to each other.

  As described above, the cooling fins 34 are arranged substantially evenly so as to connect the adjacent cooling protrusions 30 of the plurality of cooling protrusions 30 to each other, and are formed to protrude with a length shorter than the protruding length of the cooling protrusion 30. Yes. In the present embodiment, the cooling fins 34 are arranged in a direction perpendicular to each other vertically and horizontally along the arrangement direction of the cooling protrusions 30. In addition to this, for example, the cooling protrusions 30 can be arranged so as to be obliquely connected.

  Thus, the cooling protrusion 30 is reliably cooled from the root to the tip thereof directly or via the cooling fins 34 with the cooling water passing through the cooling water passage 11 provided in the jacket main body 20. Further, the cooling fin 34 cools the solution approaching the surface of the jacket body 20 as the cooling protrusions 30 are melted, whereby slag coating is performed, whereby the solution comes into direct contact with the jacket body 20. To prevent that. Such a function is not shown at all in the cited document 2.

  Specifically, the cooling protrusion 30 has a protruding length of about 300 mm from the surface of the jacket body 20a, 20b, 20c and a diameter of about 30-80 mm from the viewpoint of cooling efficiency, and is between the cooling protrusion 30 and the cooling protrusion 30. It is preferable that the distance between the centers is about 50-150 mm. Further, it is preferable that the cooling fins 34 arranged in a mesh shape so as to connect the cooling protrusions 30 adjacent to each other have a protruding length of about 150 mm and a width size of about 20 mm. Note that the cooling water passage 11 is not formed inside the cooling protrusion 30 and the cooling fin 34 so that the cooling water does not flow.

  Further, the refractory 35 is filled with no gap between the cooling protrusion 30 and the cooling fin 34, and the cooling protrusion 30 and the cooling fin 34 themselves are made of the refractory 35 so that at least the tip of the cooling protrusion 30 is covered. It is covered. The refractory 35 is inserted into a gap between the cooling protrusion 30 and the cooling fin 34 with a fixed refractory formed in advance to fit the cooling protrusion 30 and the cooling fin 34, and the gap is firmly filled with the irregular refractory 37. The cooling protrusion 30 is coated with an irregular refractory 37 so that the tip of the cooling protrusion 30 is covered with a thickness of about 30-50 mm. As a result, the refractory 35 and the irregular refractory 37 are actively cooled. The refractory 35 is not limited to this, but an irregular refractory 37 is filled in the surface of the jacket main body 20 so that the cooling protrusions 30 and the cooling fins 34 are embedded instead of the fixed refractory, and the tip of the cooling protrusion 30 is formed. It can also be configured to be covered. The coating with the irregular refractory 37 preferably has a thickness of at least 30 mm from the tip of the cooling protrusion 30.

  On the other hand, a planar attachment portion 23 is formed along the longitudinal direction (vertical direction in FIG. 1) of the jacket main body 20a on the right side edge portion of the jacket main body 20a in FIG. 1 (see FIGS. 4 and 5). ). Cooling water is supplied to the cooling water passage 11 disposed inside the jacket body 20a on the upper portion of the back side (the side that becomes the outer surface of the furnace) opposite to the surface side on which the cooling protrusions 30 and the cooling fins 34 are provided. A supply port 13a and a discharge port 13b for supplying and discharging are disposed. The cooling water channel 11 extends downward from a supply port 13a provided on the upper side of the jacket body 20a through the inside thereof, and then is bent at a substantially right angle to advance in the width direction in the vicinity of the bottom side of the jacket body 20a. And is arranged so as to reach the upper portion of the jacket body 20a and to the discharge port 13b.

  Further, the water-cooling jacket 10c is formed in a symmetrical shape with the water-cooling jacket 10a, and the left side edge of the jacket main body 20c in FIG. 1 is along the vertical direction (vertical direction in FIG. 1) of the jacket main body 20c. Thus, a flat mounting portion 23 is formed (see FIG. 2). A supply port 13a and a discharge port 13b for supplying and discharging the cooling water to and from the cooling water channel 11 arranged inside the jacket main body 20c are arranged.

  The water cooling jacket 10b disposed between the water cooling jacket 10a and the water cooling jacket 10c has a mounting portion 25 in close contact with the mounting portion 23 of the water cooling jacket 10a on the left side edge in FIG. 1, and a plurality of holes 19 a, 19 a formed in the attachment portion 23, and the two are firmly connected to each other by a fastening member 19 such as a bolt. Similarly, in the water cooling jacket 10b, a mounting portion 25 that is in close contact with the mounting portion 23 of the water cooling jacket 10c is formed along the vertical direction (vertical direction in FIG. 1) of the jacket main body 20b at the right side edge in FIG. Both are firmly connected by fastening members 19 such as bolts. Thus, the water cooling jackets 10a, 10b, and 10c are integrated to form the water cooling jacket 10. In addition, the division | segmentation shape of the water cooling jacket 10 is not restricted to this, The water cooling jackets 10a and 10b can also be continuously arranged on the right and left as one unit.

  The reason why the water cooling jacket 10 is divided and configured in this way is that the installation of the water cooling jacket 10 and the handling at the time of renewal construction, the layout of the cooling water channel 11 and the like are taken into consideration. The specific width is preferably about 400 mm in the case of the water cooling jackets 10a and 10c, and is preferably about 600 mm, that is, about 400 to 600 mm in the case of the water cooling jacket 10b. The height is preferably about 1,000 to 1,600 mm in accordance with the depth of the melt.

  As described above, the jacket main body 20 having the cooling water passage 11, the cooling protrusion 30 not having the cooling water passage 11, and the water cooling jacket 10 constituted by the cooling fins 34 are filled with the refractory 35, and the tip portion of the cooling protrusion 30 is further provided. Is entirely coated with an amorphous refractory 37. In the initial state, the tip of the cooling protrusion 30 is coated with an amorphous refractory 37 so that it does not come into direct contact with the solution. However, the coating with the amorphous refractory 37 gradually melts with the operation, and the tip of the cooling protrusion 30 and the refractory The object 35 eventually comes into contact with the solution, and the melting loss gradually proceeds. In the case of the conventional water-cooled jacket, since the refractory bricks are stacked in front of the water-cooled jacket, at the time of repair, after removing the refractory refractory bricks, a process of full renewal is required. In such a case, if repair is necessary for a portion where the refractory 35 has melted, it is possible to easily perform overcoating with an irregular refractory 37 during regular repair.

  On the other hand, three thermocouples 40 are arranged in the water cooling jacket 10 in order to grasp the degree of progress of the erosion of the cooling protrusions 30, and the temperature measured by the thermocouples 40 is calculated using a computer 50 (see FIG. 7). Thus, the progress of the melting loss of the cooling protrusion 30 is constantly monitored. Three thermocouples 40 are respectively attached to the base end portions of predetermined cooling protrusions 30 provided on the water cooling jackets 10a, 10b, and 10c, and the temperatures measured at these portions are installed in a control room (not shown). It is always taken into the computer 50 and monitored. Based on this temperature, it is possible to grasp the progress of the melting damage of the cooling protrusions 30 and the cooling fins 34. Accordingly, it is possible to estimate the lifetimes of the cooling protrusions 30 and the cooling fins 34 and prepare the water cooling jacket 10 that needs to be replaced in advance. Alternatively, a predetermined temperature may be set in the computer 50 in advance, and an alarm that prompts replacement of the water cooling jacket 10 may be activated when the temperature measured by the thermocouple 40 reaches the set temperature. The number of thermocouples 40 is not limited to this, and one or more thermocouples can be provided.

  The above-described water-cooling jacket 10 is disposed in the smelting furnace solution holding part and the high-temperature gas contact part, that is, the lower part of the shaft 2, the side part of the setter 3, and the lower part of the uptake 4. . Here, 1 b in FIG. 3 is a road bottom portion of the flash smelting furnace 1, and 1 a is a refractory brick disposed on the water cooling jacket 10. In the normal operation state of the flash furnace 1, the thickness of the slag 5 is about 400 to 700 mm, the thickness of the mat 6 is about 500 to 850 mm, and the maximum hot water depth combining the slag 5 and the mat 6 is about 1 , 550 mm. The temperature of the slag 5 and the mat 6 is about 1,200 to 1,300 ° C. Therefore, it is preferable to set the length and width size of the cooling protrusion 30 based on this temperature and to set the height of the water cooling jacket 10 in accordance with the hot water depth.

  In the flash smelting furnace 1 having the above-described furnace body cooling structure, the refractory 35 and the amorphous refractory are flowed by flowing cooling water from the supply port 13a of the cooling water channel 11 at a predetermined flow rate and discharging it from the discharge port 13b. 37 can be actively cooled to perform stable operation of the flash smelting furnace 1. Moreover, the strength of cooling can be adjusted by appropriately adjusting the flow rate of the cooling water to the cooling water channel 11. In this case, adjustments such as increasing the flow rate of the cooling water when the measured temperature rises using data constantly monitored by the thermocouple 40 and decreasing the flow rate of the cooling water when the temperature becomes stable are performed by computer management. You can also

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible.

10, 10a, 10b, 10c Water-cooling jacket 11 Cooling channel 13a Supply port 13b Discharge port 19 Fastening member 19a Hole 20, 20a, 20b, 20c Jacket body 23 Mounting portion 25 Mounting portion 30 Cooling protrusion 34 Cooling fin 35 Refractory 37 Amorphous refractory 40 Thermocouple 50 Computer

Claims (6)

A jacket body with a cooling water channel inside,
A plurality of cooling protrusions arranged on the jacket body so as to protrude toward the inside of the furnace;
Cooling fins that are arranged so as to connect the cooling protrusions adjacent to each other, and are formed to protrude with a length shorter than the protruding length of the cooling protrusions;
With
The refractory is filled with no gap between the cooling protrusion and the cooling fin, and the cooling protrusion and the cooling fin itself are covered with the refractory so that at least the tip of the cooling protrusion is covered. Features a water-cooled jacket. The water cooling jacket according to claim 1,
The water cooling jacket is constituted by dividing the water cooling jacket into a plurality of parts in the vertical direction. The water cooling jacket according to claim 1 or 2,
The cooling protrusions and the cooling fins are formed by integral casting with the jacket main body, and the cooling protrusions and the cooling fins are not provided with cooling water passages inside, and the cooling water passages are arranged only inside the jacket main body to generate heat. The jacket provided with the cooling water channel by cooling the cooling protrusion and the cooling fin by conduction to solidify a solution that progresses between the cooling protrusion and the cooling fin toward the jacket body when the refractory is melted. A water-cooled jacket characterized in that the main body is not in direct contact with the solution. The water cooling jacket according to any one of claims 1 to 3,
One or a plurality of thermocouples for grasping the degree of progress of the erosion of the cooling protrusion, and the degree of erosion of the cooling protrusion and the cooling fin by analyzing the temperature measured by the thermocouple using a computer A water-cooling jacket characterized by constantly monitoring.   A furnace cooling structure using a water cooling jacket, wherein the water cooling jacket according to any one of claims 1 to 4 is disposed as a furnace wall of a smelting furnace.   A water-cooling jacket characterized in that the water-cooling jacket according to any one of claims 1 to 4 is disposed as a furnace wall of a smelting furnace, and the operating furnace wall is cooled by flowing cooling water through the cooling water channel. A furnace cooling method using a jacket.

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