JP2011226711A - Cooling structure and cooling method of flash furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a flash furnace for cooling a settler ceiling portion whose temperature is made high by a heat load.SOLUTION: In the flash furnace 10 in which a shape of the settler ceiling portion 60 is made into an arch shape, the cooling structure 70 of the flash furnace is constituted by arranging a plurality of water cooled jackets 71 by adjusting them to the arch shape of the settler ceiling portion 60. The shapes of respective parts of the cooling structure 70 differ at every place where the structure is arranged by adjusting it to the shape of the settler ceiling portion. A copper pipe through which cooling water flows is cast into the cooling jacket which is hung down and supported so that it can vertically operate.

Description

  The present invention relates to a cooling structure for a settling ceiling of a flash smelting furnace.

  In the smelting process of copper smelting, the concentrate obtained by the beneficiation is introduced into a flash smelting furnace simultaneously with oxygen-enriched air or high-temperature hot air to cause a chemical reaction instantaneously and separate into mat and slag. As shown in FIG. 1, such a flash smelting furnace 1 includes a reaction shaft 2, a setter 3, and an uptake 4, and the reaction shaft 2 is provided with 1 to 3 concentrate burners 5. The concentrate is blown into the furnace by the concentrate burner 5.

  In such a flash furnace, heat generation is unavoidable in the copper smelting process. In particular, with the recent demand for increased copper production, operation at high loads is required, and the amount of heat generated in the flash smelting furnace has also increased. For this reason, deterioration progress of refractory materials, such as a heat-resistant brick which comprises a flash smelting furnace, was to be accelerated. On the other hand, Patent Documents 1 to 5 disclose techniques for suppressing the progress of deterioration of the refractory material.

  Patent Document 1 discloses a water-cooled jacket structure that is attached to an inspection hole in the vicinity of a concentrate burner arranged on the ceiling of a reaction shaft of a flash smelting furnace. Patent Document 2 discloses a tap hole cooling structure for extracting a mat or slag from a flash smelting furnace main body. Patent Document 3 shows a furnace water cooling structure in which a copper water cooling jacket in which a pipe member through which cooling water is cast is suspended and supported on a triangular ceiling portion of a setter located near the shaft of a flash furnace. . Patent Document 4 shows a furnace body cooling structure of a flash smelting furnace in which a water cooling jacket is suspended and supported at a connecting part between a shaft and a setr of a flash furnace or a connecting part between an uptake and a setr. Patent Document 5 discloses a furnace water cooling jacket for cooling a refractory in a region where a slag layer immediately below the shaft of a flash furnace is generated.

JP 2009-162401 A Japanese Patent No. 4350119 JP 2008-202923 A Japanese Patent No. 4187552 Japanese Patent No. 4064387

  By the way, when the concentrate reacts in the flash furnace and heat is generated, the influence of the heat also appears on the ceiling of the setter. The bricks on the setra ceiling are subject to significant damage due to the heat load. If the bricks are worn out, the bricks on the setra ceiling may fall off, and the operation of the flash furnace is stopped when the bricks fall off. There is a need. Furthermore, it is considered that exhaust gas in the flash smelting furnace leaks, and it is necessary to consider environmental pollution. The life of bricks on the ceiling of this setra is short and a year and a half, and the operation of the flash smelting furnace has to be stopped for brick replacement work, which is a factor that reduces the operating rate of the flash smelting furnace It was. In addition, replacement of bricks also required material costs and work costs. On the other hand, in the above-mentioned patent document, there is a configuration that cools the petticoat portion of the reaction shaft, the triangular ceiling, and the connection portion between the reaction shaft and the setler, but nothing that cools the setter ceiling portion is found.

  Accordingly, an object of the present invention is to cool a setter ceiling that is heated to a high temperature by a thermal load.

  The cooling structure of the flash smelting furnace of the present invention that solves such problems is a flash smelting furnace in which the shape of the setter ceiling part is an arch shape, and a plurality of water cooling jackets are arranged in accordance with the arch shape of the settler ceiling part. It is characterized by being configured.

  In the cooling structure of the flash smelting furnace, the water cooling jacket may have a configuration in which each shape is different for each place where the water cooling jacket is arranged in accordance with the shape of the settling ceiling.

  Moreover, the cooling structure of the flash smelting furnace may be configured such that the water cooling jacket is disposed at a location where the thermal load on the setter ceiling is high.

  The cooling structure of the flash smelting furnace may constitute an inclined portion that reaches the reaction shaft side of the setter ceiling.

  In the cooling structure of the flash smelting furnace, the water cooling jacket may be formed by casting a copper pipe through which cooling water flows.

  In the cooling structure of the flash smelting furnace described above, the water cooling jacket may be suspended and supported so as to be operable in the vertical direction.

  In the cooling structure of the flash smelting furnace described above, the furnace-side surface of the water-cooled jacket may be formed with irregularities, and the concave parts are filled with a refractory.

  Moreover, the cooling method of the flash smelting furnace of the present invention that solves the above-described problem is a flash smelting furnace in which the shape of the settler ceiling part is an arch shape, to a plurality of water cooling jackets arranged according to the arch shape of the settler ceiling part. Cooling is performed by supplying cooling water.

  The method for cooling the flash smelting furnace may be a method of cooling by supplying cooling water to a water cooling jacket having a different shape for each place in accordance with the shape of the settling ceiling.

  The method for cooling the flash furnace may be a method of cooling by supplying cooling water to a water-cooling jacket disposed in a place where the setr ceiling has a high heat load.

  The method for cooling the flash furnace may be a method of cooling by supplying cooling water to a water cooling jacket disposed in an inclined portion reaching the reaction shaft side of the settler ceiling.

  The method of cooling the flash furnace may be a method of cooling by supplying cooling water to a water-cooling jacket in which a copper pipe through which cooling water is disposed arranged on the setter ceiling is cast.

  The method for cooling the flash furnace may be a method of cooling by supplying cooling water to a water-cooling jacket that is suspended and supported so as to be operable in the vertical direction and is arranged on the setter ceiling.

  The cooling method of the flash furnace is a method of cooling by supplying cooling water to the water-cooling jacket disposed on the setter ceiling portion in which irregularities are formed on the surface on the furnace side and the refractory is filled in the concave portions. be able to.

The flash smelting apparatus of the present invention has the following effects.
(1) By providing a water cooling jacket on the arch-shaped settler ceiling part and circulating the cooling water, it is possible to cool the settler ceiling part and to prevent the structure of the ceiling part from falling into the furnace due to thermal wear. Thereby, since the frequency | count of replacement | exchange of a structure can be reduced and the frequency | count of stopping a flash smelting furnace reduces, the operating efficiency of a flash smelting furnace can be improved. Moreover, leakage of exhaust gas can be prevented by preventing the fall.
(2) In particular, by providing a water cooling jacket on the reaction shaft side having a high heat load in the ceiling of the setter, the effect of eliminating the influence of heat into the furnace stands out.
(3) The cooling effect can be improved by adopting a structure in which the water-cooled jacket is made by casting a copper pipe having good thermal conductivity. In addition, even if a crack or the like occurs in the water cooling jacket, water leakage does not occur unless the copper pipe is cracked, so that leakage of cooling water can be prevented.
(4) Since the water-cooling jacket can be divided into a plurality of parts, only a worn part can be replaced. For this reason, the expense and time concerning replacement | exchange of a water cooling jacket can be reduced, and work efficiency can be improved. Further, since the work space for replacing the water cooling jacket is narrow, the work efficiency can be improved, thereby reducing the burden on the worker.
(5) Moreover, since the water cooling jacket is suspended and supported so as to be operable in the vertical direction, the burden of replacement work can be reduced.
(6) Moreover, it can respond to the ceiling of any structure by comprising a water-cooling jacket according to a settler ceiling structure. Moreover, since it is a shape according to the ceiling structure, it is difficult for gaps to occur, and leakage of exhaust gas can be prevented.

It is explanatory drawing of schematic structure of the flash smelting furnace of a prior art. It is explanatory drawing which showed schematic structure of the flash smelting furnace provided with a cooling structure, (a) is a top view of a flash smelting furnace, (b) is sectional drawing in the AA in (a). is there. It is the perspective view which showed the cooling structure. (A) is a front view of a cooling structure, (b) is explanatory drawing which showed the top view of the cooling structure. It is explanatory drawing which showed the water cooling jacket, Comprising: (a) is a front view of the water cooling jacket when it sees from the outside of a furnace when installing a water cooling jacket in a flash smelting furnace, (b) is a side view, (c) Is a rear view, (d) is a BB cross-sectional view of (a), and (e) is a CC cross-sectional view of FIG. 5 (a). It is explanatory drawing which showed the water cooling jacket installed in the flash smelting furnace in the cross section.

  Hereinafter, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  The flash smelting furnace 10 including the cooling structure 70 in the present embodiment will be described with reference to the drawings. FIG. 2 is an explanatory diagram showing a schematic configuration of the flash smelting furnace 10 including the cooling structure 70 of the present embodiment. 2A is a plan view of the flash smelting furnace 10, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A.

  As shown in FIG. 2, the flash smelting furnace 10 includes a reaction shaft 20, a setter 30, and an uptake 40. A concentrate burner 50 is provided above the reaction shaft 20, and concentrate and oxygen-enriched air are blown into the reaction shaft 20 from the concentrate burner 50. The blown concentrate and oxygen-enriched air are mixed in the reaction shaft 20 and react instantaneously, and are separated into a layered mat and slag in the setter 30.

  The ceiling portion 60 of the setter 30 is formed in an arch shape having a high mechanical strength. In addition, since the gas that has become hot due to the oxidation reaction of the concentrate passes through the entrance of the arch-shaped ceiling 60, that is, the inclined portion 61 that reaches the reaction shaft 20 side of the ceiling of the setter 30, the setter 30 Among these ceiling portions 60, the heat load is particularly high. The cooling structure 70 is incorporated in the inclined portion 61 having such a high heat load. The cooling structure 70 is positioned so as to be sandwiched between the arched H steel 80.

  FIG. 3 is a perspective view showing the cooling structure 70. 4A is a front view of the cooling structure 70, and FIG. 4B is an explanatory view showing a plan view of the cooling structure 70. In FIG. 4A, detailed description of the configuration is omitted. The cooling structure 70 includes a water cooling jacket 71 in which a copper pipe through which cooling water flows is cast. As shown in FIGS. 3 and 4, the cooling structure 70 is divided into water-cooling jackets 71 that are subdivided into 24 in 12 rows and 12 rows in accordance with the arch structure of the ceiling 60 of the setter 30. The inclined portion 61 in which the cooling structure 70 is arranged has a complicated shape with an inclined shape as in the cross section of FIG. 2 and an arch shape in a direction perpendicular to the cross section of FIG. For this reason, each of the water cooling jackets 71 constituting the cooling structure 70 has a different shape such as a size and an angle for each place. Further, the three holes 70a, 70b, 70c shown in the cooling structure 70 shown in FIGS. 3, 4 (a), 4 (b) are pressure gauges or heavy oil burners for measuring the pressure in the flash furnace 10. It is used as an installation port for pig iron and pig iron.

  FIG. 5 is an explanatory view showing one of the water cooling jackets 71. 5A is a front view of the water cooling jacket 71 when viewed from the outside of the furnace when the water cooling jacket 71 is installed in the flash furnace 10, FIG. 5B is a side view of the water cooling jacket 71, and FIG. FIG. 5C is a rear view of the water cooling jacket 71, FIG. 5D is a BB cross-sectional view of FIG. 5A, and FIG. 5E is a CC cross-sectional view of FIG. 5A.

  Two copper pipes 72 through which cooling water flows are juxtaposed into the water cooling jacket 71. In the water cooling jacket 71, each of the two pipes 72 includes a water supply port 73 and a drain port 74. The water supply ports 73 of the pipes 72 are arranged diagonally oppositely, the drainage ports 74 of the pipes 72 are arranged diagonally oppositely, and the direction of the cooling water flowing through the pipes 72 is different. . Near the center of the front surface of the water cooling jacket 71, three bolt holes 75 for suspension rings are provided. Moreover, as shown in FIG.5 (c), when installed in the flash smelting furnace 10, the recessed part 76 is provided in the back surface of the water cooling jacket 71 which faces the inner side of a furnace. Although the shape of the water cooling jacket 71 differs depending on the place where it is disposed, the pipe 72 through which the cooling water passes, the water supply port 73, the drainage port 74, the bolt hole 75, and the recess 76 on the back surface are provided with any water cooling jacket 71.

  FIG. 6 is an explanatory view showing a cross section of the cooling structure 70 installed in the flash smelting furnace. The cooling structure 70 is located between the two H steels 80. Further, the water cooling jacket 71 obtained by dividing the cooling structure 70 is configured to be suspended and supported by the suspension member 90 so as to be operable in the vertical direction.

  Furthermore, as shown in FIG. 6, the recess 76 of the water cooling jacket 71 is filled with a refractory 77 such as castable. This refractory 77 is formed by tamping an amorphous refractory so as to have a thickness of 100 mm inside the furnace of the water cooling jacket 71. As such an irregular refractory material, a substance having a higher melting point than slag and a low thermal expansion property is preferable, and has many functional characteristics such as heat dissipation characteristics, hardness, wear resistance, corrosion resistance, high temperature strength, and thermal shock resistance. Alumina-based castables such as alumina chromia are preferred. Moreover, the thing whose main component is MgO (For example: The product made from Yotai: Yawtai stamp (R-MP)) etc. can also be utilized. Various shapes such as a triangle, a quadrangle, a rectangle, a trapezoid, a U-shape, and a dish shape are possible as the cross-sectional shape of the recess 76, but a trapezoidal shape that is narrowed toward the inside of the furnace is preferable from the viewpoint of preventing the refractory from falling off. . Further, the surface of the recess 76 can be a flat surface, a fine uneven surface, or the like, and further, pin-like protrusions can be provided so that the refractory to be filled and the recess 76 are firmly engaged. In order to remove the filled refractory with good timing, a flat surface obtained by casting or cutting is preferable.

  Next, the cooling water passing through the water cooling jacket 71 will be described. The cooling structure 70 includes four cooling water paths. Six water cooling jackets 71 form one cooling water path. For example, the six water cooling jackets 71a, 71b, 71c, 71d, 71e, 71f on the upper right side in FIG. 4 form one path. The cooling water flows into the water cooling jacket 71a disposed at the end, moves from the water cooling jacket 71a to the water cooling jacket 71b disposed adjacently, and sequentially moves to the adjacent water cooling jacket. When the cooling water reaches the central water-cooling jacket 71f, the cooling water returns through the water-cooling jacket 71f and returns to the water-cooling jacket 71a. Similarly, six other water-cooling jackets in FIG. 4 constitute one path. Thus, the cooling water is configured to reciprocate in the cooling structure 70, thereby efficiently cooling. The cooling water flowing into the pipe 72 in the water cooling jacket 71 has an inflow temperature of 25 to 35 ° C. and an inflow speed of 23 m / s, and the cooling water discharged from the pipe 72 has an exhaust temperature of 35 to 45 ° C. The speed is 23 m / s. The flow rate of the cooling water is 33 L / min.

The cooling structure 70 of the present embodiment described above has the following effects.
(1) The ceiling portion 60 of the arch-shaped setter 30 is provided with a water cooling jacket 71 on the reaction shaft 30 side where the heat load is high, and the cooling water is circulated to cool the ceiling portion 60 of the setter 30 and the ceiling portion due to thermal wear. The structure of 60 is prevented from falling into the furnace. Thereby, since the frequency | count of replacement | exchange of the structure of the ceiling part 60 performed for fall prevention is reduced, the frequency | count of the stop of the flash smelting furnace 10 reduces, and the operation efficiency of the flash smelting furnace 10 improves. In addition, the fall prevention prevents the exhaust gas from leaking and prevents environmental accidents.
(2) Since the water cooling jacket 71 has a structure in which the pipe 72 is cast, even if a crack or the like occurs in the water cooling jacket 71, water does not leak unless the pipe 72 is cracked. Leakage is prevented. Further, the cooling water flowing through the pipe 72 reciprocates the cooling structure 70, whereby the cooling is performed efficiently. Moreover, since the pipe 72 is made of copper having good thermal conductivity, the cooling efficiency is high.
(3) By dividing the cooling structure 70 into a plurality of water cooling jackets 71, only the worn parts can be replaced. For this reason, the expense and time concerning replacement | exchange of the water cooling jacket 71 are reduced, and work efficiency is improved. Further, although the work space for exchanging the water cooling jacket 71 is narrow, the work efficiency is improved, thereby reducing the burden on the worker.
(4) By providing a recess on the back of the water-cooling jacket 71 and filling the refractory 77, the water-cooling jacket 71 and the refractory 77 conduct heat efficiently, and the refractory is heated by the high-temperature airflow generated in the furnace. 77 is cooled efficiently.
(5) Moreover, the work load at the time of replacement | exchange of the water cooling jacket 71 can be reduced by suspending and supporting the water cooling jacket 71 so that it can operate | move up and down. That is, the water cooling jacket 71 can be suspended and easily moved to the place where the water cooling jacket 71 is placed, so that the work burden of transporting the heavy water cooling jacket 71 to the ceiling 60 of the setter 30 manually can be reduced. Moreover, by dropping and supporting the water cooling jacket 71, it is possible to prevent the water cooling jacket 71 from falling into the furnace.
(6) Further, by combining the subdivided water cooling jacket 71 and configuring the cooling structure 70 in accordance with the arched ceiling structure, it is possible to cope with a ceiling having a complicated structure. In addition, since the cooling structure 70 is arranged in accordance with the ceiling structure, a gap is hardly generated, and leakage of exhaust gas is prevented.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

DESCRIPTION OF SYMBOLS 1,10 Flash furnace 2,20 Reaction shaft 3,30 Settler 4,40 Uptake 5,50 Concentrate burner 60 Ceiling part 70 Cooling structure 71 Water cooling jacket 72 Pipe 76 Recessed part 77 Refractory 90 Suspended member

Claims (14)

  In the flash smelting furnace in which the shape of the settler ceiling part is an arch shape, a cooling structure of the flash smelting furnace is configured by arranging a plurality of water cooling jackets in accordance with the arch shape of the settler ceiling part.   The said water cooling jacket is a cooling structure of the flash smelting furnace of Claim 1 from which each shape differs for every location arrange | positioned according to the shape of the said settler ceiling part.   The cooling structure of the flash smelting furnace according to claim 1 or 2, wherein the water cooling jacket is disposed at a location where the thermal load of the settler ceiling is high.   The cooling structure of the flash smelting furnace according to claim 1, wherein an inclined portion reaching the reaction shaft side of the settler ceiling is configured.   The said water cooling jacket is a cooling structure of the flash smelting furnace of Claims 1-4 which cast the copper pipe through which cooling water flows.   The cooling structure for a flash smelting furnace according to claim 1, wherein the water cooling jacket is suspended and supported so as to be operable in the vertical direction.   The cooling structure of the flash smelting furnace according to claim 1, wherein the furnace-side surface of the water-cooling jacket is provided with irregularities, and the concave parts are filled with a refractory.   In a flash smelting furnace having an arched shape of a settler ceiling, cooling is performed by supplying cooling water to a plurality of water cooling jackets arranged in accordance with the arch shape of the settler ceiling. Method.   The method for cooling a flash furnace according to claim 8, wherein cooling water is supplied to a water-cooling jacket having a different shape for each place to be cooled in accordance with the shape of the setter ceiling.   The cooling method of the flash smelting furnace according to claim 8 or 9, wherein cooling water is supplied to a water-cooling jacket disposed at a location where the heat load on the settler ceiling part is high to cool.   The cooling method of the flash smelting furnace according to claim 8, wherein cooling water is supplied and cooled to a water cooling jacket disposed in an inclined portion reaching the reaction shaft side of the setter ceiling.   The method for cooling a flash furnace according to any one of claims 8 to 11, wherein cooling water is supplied and cooled to a water-cooling jacket in which a copper pipe through which cooling water flows, which is disposed on the setter ceiling, is cast.   The method for cooling a flash furnace according to any one of claims 8 to 12, wherein the cooling water is cooled by supplying a cooling water to a water-cooling jacket that is suspended and supported so as to be operable in an up-down direction and disposed on the setter ceiling.   The cooling method of a flash smelting furnace according to claim 8 to 13, wherein cooling water is supplied and cooled to a water cooling jacket disposed on the settler ceiling part in which irregularities are formed on the furnace side surface and the refractory is filled in the concave part. .

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