JP2013210183A - Cooling structure of h steel in settler ceiling part of flash furnace and cooling method of h steel in settler ceiling part of flash furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend life of an H steel by suppressing the damage and deformation of the H steel supporting a settler ceiling part by cooling the H steel supporting the settler ceiling part.SOLUTION: A cooling structure of an H steel in settler ceiling part of flash furnace arranged in the settler ceiling part of the flash finance, contacting the H steel 70 supporting the settler ceiling part and having a cooling member comprising copper or stainless steel-made cooling water pipes 81, 83 and heat sink 82 and a cooling method of the H steel in the settler ceiling part of the flash furnace.

Description

  The present invention relates to a cooling structure for H steel that supports a settling ceiling of a flash 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 is 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, the settling ceiling part of a flash smelting furnace is supported by spanning several H steels. When the concentrate reacts in the flash furnace and heat is generated, the effect of the heat also appears on the setra ceiling. When the setra ceiling part receives heat, the H steel supporting the settler ceiling part is also affected by the heat load, and is worn and deformed. Thus, when H steel receives heat, and is worn out or deformed, it is considered that the adjacent refractory material falls off, and it is necessary to stop the operation of the flash smelting furnace when the refractory material falls off. Furthermore, it is considered that exhaust gas in the flash smelting furnace leaks, and it is necessary to consider environmental pollution. Conventionally, in consideration of the effects of wear and deformation of H steel, it has been necessary to replace H steel in a cycle of 2 to 3 years. It was over. With respect to such a problem, the above-mentioned patent document does not consider the point related to the cooling of the setter ceiling, in particular, the H steel that supports the setter ceiling.

  Then, this invention makes it a subject to suppress the wear and deformation | transformation of H steel, and to prolong the lifetime of H steel by cooling H steel which supports a setter ceiling part.

The cooling structure of H steel in the settling ceiling part of the flash smelting furnace of the present invention that solves such a problem is in contact with the H steel provided on the settling ceiling part of the flash melting furnace and supporting the settling ceiling part, and is made of copper. Alternatively, it is made of stainless steel and has a cooling member for cooling the H steel.

In the H steel cooling structure in the settling ceiling part of the flash furnace, the cooling member may be arranged in contact with the inner surface of the H steel web part.

  In the H steel cooling structure in the settling ceiling of the flash furnace, the cooling member may be arranged in contact with the furnace inside of the H steel flange.

  In the cooling structure of H steel in the settling ceiling part of the flash furnace, the cooling member may have a cooling water pipe through which cooling water flows.

  In the cooling structure for H steel in the settling ceiling of the flash smelting furnace, the cooling member is a heat sink that contacts the H steel, and a cooling water pipe that is in contact with the heat sink and through which cooling water flows. It can be set as the structure which has these.

In the H steel cooling structure in the settling ceiling of the flash furnace, the cooling member disposed in contact with the furnace inner surface of the H steel web portion is a cooling water pipe through which cooling water flows. And the cooling member disposed in contact with the inside of the furnace of the flange portion of the H steel includes a radiator plate that contacts the H steel, and a cooling water pipe that contacts the radiator plate and through which cooling water flows. It can be set as such a structure.

  In the cooling structure of H steel at the settling ceiling of the flash furnace, the heat radiating plate may be joined to the H steel by tap welding.

  In the H steel cooling structure in the settling ceiling part of the flash furnace, the heat radiating plate can be made of copper. Moreover, the cooling water pipe can be made of copper in the H steel cooling structure in the settling ceiling part of the flash furnace.

In the cooling structure of steel H in Settora ceiling of the flash smelting furnace can be configured to have three the cooling water tubes of the furnace inward from the web portion of the H steel.

The method for cooling H steel in the settling ceiling part of the flash smelting furnace of the present invention that solves the above-mentioned problems is made of copper or stainless steel on the H steel that is provided in the settling ceiling part of the flash melting furnace and supports the settling ceiling part. A cooling member made of metal is contacted and the H steel is cooled .

In the method for cooling H steel in the settling ceiling part of the flash smelting furnace, the cooling member in contact with the inner surface of the H steel web part is a cooling water pipe through which cooling water flows, and the H steel The cooling member that is in contact with the inside of the furnace of the flange portion may be a heat sink that is in contact with the H steel, and a cooling water pipe that is in contact with the heat sink and through which cooling water flows.

In the method for cooling H steel in the settling ceiling of the flash furnace, the cooling water pipe and the heat radiating plate may be made of copper .

The cooling structure of H steel in the ceiling part of the flash smelting furnace of the present invention suppresses wear and deformation of H steel and extends the life of H steel by cooling the H steel supporting the setter ceiling. Can do. More specifically,
(1) By bringing a cooling member into contact with H steel, the amount of heat taken directly from H steel can be increased, and cooling of H steel can be promoted.
(2) By disposing the cooling member inside the H steel furnace, the inside of the H steel near the heat source can be cooled.
(3) Since the cooling water takes the heat of the H steel by having a cooling water pipe through which the cooling water flows, the high temperature of the H steel can be suppressed.
(4) By making a heat sink contact H steel, since a heat sink with a large contact area takes heat from H steel, the cooling effect of H steel can be improved.
(5) The cooling effect of H steel can be improved by using copper excellent in thermal conductivity as a cooling member.
(6) The steel inside the H steel near the heat source uses copper with high thermal conductivity, has high cooling performance, and the steel outside the H steel far from the heat source uses high strength and inexpensive stainless steel. Can be reduced.

It is explanatory drawing which showed 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 the cooling structure of H steel of a present Example, (a) shows the top view of a flash smelting furnace, (b) is A in (a). A sectional view taken along line -A is shown. It is explanatory drawing which showed the ceiling part of the settler. It is explanatory drawing which showed H steel. It is sectional drawing which showed the cooling structure of H steel. It is sectional drawing which showed the cooling structure of H steel of a comparative example.

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

  The configuration of the apparatus in the present embodiment will be described with reference to the drawings. FIG. 2 is an explanatory view showing a schematic configuration of a flash smelting furnace 10 provided with a cooling structure of H steel of this 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.

  The flash furnace 10 is, for example, a copper smelting flash furnace. 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.

  By the way, the furnace wall of the flash smelting furnace 10 that is at a high temperature is configured by spreading heat-resistant bricks. In order to support such a brick, the ceiling portion 60 of the setter 30 is spanned by six arch-shaped H steels 70 made of SS400. Further, the flash furnace 10 is provided with a cooling structure 80 for cooling the H steel 70.

  FIG. 3 is an explanatory view showing the ceiling portion 60 of the setter 30. FIG. 4 is an explanatory view showing the H steel 70. FIG. 5 is a cross-sectional view showing a cooling structure 80 of H steel 70. FIG. 6 is a sectional view showing a cooling structure 90 of H steel 70 of a comparative example.

  As shown in FIG. 3, the ceiling portion of the setter 30 is supported by six H steels 70. Heat resistant bricks are packed between the H steels 70. The distance between the H steel 70 located closest to the reaction shaft 20 and the H steel 70 located closest to the uptake 40 is approximately 6200 mm.

  The H steel 70 in FIG. 4 shows the case seen from the direction of arrow B in FIG. As shown in FIG. 4, the H steel 70 has an arched structure. In addition, the cooling structure 80 described below has an arched shape so as to follow the arched structure of the H steel 70.

  Here, the cooling structure 80 will be described in detail with reference to FIG. The H steel 70 is disposed such that the web portion 71 is in the horizontal direction. The H steel 70 is made of a general structural rolled steel (SS400) having a thickness of 22 mm. The cross section of the H steel 70 has a height of 450 mm and a width of 250 mm.

  The cooling structure 80 includes a cooling member. The cooling member includes cooling water pipes 81 and 83 and a heat radiating plate 82, which will be described later. The cooling structure 80 is disposed so as to contact the inner surface of the H steel 70. 71 is arranged on both sides.

  Next, the cooling member will be described in detail. Three copper cooling water pipes (copper pipes) 81 are arranged on the center side of the setter 30 relative to the web part 71 of the H steel 70, that is, below the web part 71. One of the copper tubes 81 is disposed in contact with the lower surface of the web portion 71. The remaining copper tube 81 is disposed in contact with the heat dissipation plate 82 that contacts the flange portion 72. These copper tubes 81 have an outer diameter of 32 mm and a thickness of 6 mm, and the heat sink 82 is also made of copper. The copper tube 81 and the heat radiating plate 82 have an arch shape along the arch shape of the H steel 70. Further, the heat radiating plate 82 is applied to the flange portion 72 of the H steel 70 by tap welding. The specially shaped portion having a large arch shape as in the present invention is easier to manufacture and shorter in manufacturing time than the case of fully welding the heat sink 82 made of copper and the H steel 70 made of SUS. Is advantageous in that it is inexpensive and sufficient mechanical strength can be obtained.

  On the other hand, three stainless steel cooling water pipes (stainless steel pipes, for example, SUS304) 83 are arranged on the outer peripheral side of the setter 30 with respect to the web part 71 of the H steel 70, that is, on the upper side of the web part 71. All of the stainless steel pipes 83 are disposed so as to contact the web portion 71. The stainless steel tube 83 has an outer diameter of 34 mm and a thickness of 6.4 mm, and the stainless steel tube 83 has an arch shape that follows the arch shape of the H steel 70.

  Further, a copper tube 81, a heat radiating plate 82, and a stainless steel tube 83 are arranged on the H steel 70, and a refractory 73 is filled in the gap. The refractory 73 is preferably a substance having a melting point higher than that of slag and a low thermal expansion, and is an alumina-based castable having many functional characteristics such as heat dissipation characteristics, hardness, wear resistance, corrosion resistance, high-temperature strength, and thermal shock resistance. For example, alumina chromia is preferable. Moreover, the thing whose main component is MgO etc. can also be utilized.

  The copper pipe 81 and the stainless steel pipe 83 of the cooling structure 80 are configured such that cooling water passes through the inside of the pipe. The cooling water passing through the copper pipe 81 and the stainless steel pipe 83 has an inflow temperature of 25 to 35 ° C. and an inflow speed of 23 m / s, and the discharged cooling water has an exhaust temperature of 35 to 45 ° C. and an outflow speed of 23 m / s. is there. The flow rate of the cooling water is 33 L / min.

  Next, the cooling structure 90 of the comparative example will be described. As shown in FIG. 6, in the cooling structure 90, a copper cooling water pipe 91 including a heat radiating plate 92 is arranged without contacting the H steel 70. And like the cooling structure 80 of the embodiment, the refractory 73 is filled in the gap between the H steel 70 and the cooling structure 90.

  In the case of the cooling structure 80 of the present embodiment, since the cooling member, that is, the copper tube 81 and the heat sink 82 are in contact with the H steel 70, the heat from the H steel 70 is compared with the comparative example that is not in contact. Communication is improved. Therefore, the cooling structure 80 of the example is superior in the cooling effect of the H steel 70 compared to the comparative example.

The cooling structure 80 of the H steel 70 of the flash smelting furnace 10 in the present embodiment has the following effects.
(1) By bringing a cooling member into contact with the H steel, heat is directly taken from the H steel, and cooling of the H steel is promoted.
(2) Cooling the inside of the H steel near the heat source by disposing the cooling member inside the H steel.
(3) When the cooling water flows through the inside of the cooling water pipe (copper pipe 81, stainless steel pipe 83), the cooling water takes heat of the H steel and the H steel is cooled.
(4) Since the heat of the H steel 70 is transmitted to the heat radiating plate 82, the high temperature of the H steel 70 can be suppressed.
(5) The cooling effect of the H steel 70 is improved by using the copper pipe 81 with excellent thermal conductivity as the cooling pipe inside the furnace.
Due to the effects (1) to (5), the high temperature of the H steel 70 can be suppressed, the wear and deformation of the H steel 70 can be suppressed, and the life of the H steel 70 can be extended. By adopting such a cooling structure 80, it can be estimated that the H steel 70 can be maintained for 5 to 6 years. Thereby, the cost concerning replacement | exchange of H steel is reduced. Further, since the wear and deformation of the H-steel 70 are suppressed, the bricks are prevented from falling off, so the number of times the flash furnace is stopped is reduced and the operating rate is improved. Moreover, gas leakage can be prevented and environmental accidents can be prevented.

  Furthermore, the furnace inner side of the H steel 70 close to the heat source uses copper having high thermal conductivity and has high cooling performance, while the furnace outer side of the H steel 70 far from the heat source uses high-strength and inexpensive stainless steel, Reduce costs. Compared to copper pipes with the same diameter, stainless steel pipes, for example, have two copper pipes of 65 (10,000 yen) and two stainless steel pipes are 31 (10,000 yen), which is about half price, reducing costs. There are advantages you can do.

  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.

  For example, as another example of this embodiment, the stainless steel pipe 83 may be a copper pipe 81. Further, the heat radiating plate 82 may be disposed on the outer peripheral side of the setter 30 relative to the web portion 71 of the H steel 70, that is, on the upper side of the web portion 71 of the H steel 70. Also in this case, the heat sink 82 is brought into contact with the H steel 70. By adopting these configurations, a further cooling effect can be expected.

DESCRIPTION OF SYMBOLS 1,10 Flash furnace 2,20 Reaction shaft 3,30 Settler 4,40 Uptake 5,50 Concentrate burner 70H steel 71 Web part 72 Flange part 73 Refractory 80 Cooling structure 81 Cooling water pipe (copper pipe)
82 Heat sink 83 Cooling water pipe (stainless steel pipe)

Claims (13)

A cooling member is provided on a settling ceiling portion of the flash smelting furnace and is in contact with H steel supporting the settling ceiling portion , made of copper or stainless steel, and cooling the H steel. H steel cooling structure in the settling ceiling of the flash furnace. The cooling structure of H steel in the settling ceiling part of the flash smelting furnace according to claim 1, wherein the cooling member is disposed in contact with a surface inside the furnace of the H steel web part.   The cooling structure of H steel in the settling ceiling part of the flash smelting furnace according to claim 1, wherein the cooling member is disposed in contact with the furnace inside of the flange part of the H steel.   The said cooling member is a cooling structure of H steel in the settling ceiling part of a flash smelting furnace as described in any one of Claims 1 thru | or 3 which has a cooling water pipe | tube with which cooling water distribute | circulates inside. The cooling member is a heat sink contacting the H steel;
A cooling water pipe in contact with the heat radiating plate and through which cooling water flows;
The cooling structure of H steel in the settling ceiling part of the flash smelting furnace as described in any one of Claims 1 thru | or 4 which has these. The cooling member arranged in contact with the furnace inner surface of the H steel web part is a cooling water pipe through which cooling water flows.
The cooling member disposed in contact with the furnace inside of the flange portion of the H steel is a heat sink that contacts the H steel, and a cooling water pipe that contacts the heat sink and through which cooling water flows. The cooling structure of H steel in the settling ceiling part of the flash smelting furnace according to claim 1.   The said heat sink is the cooling structure of H steel in the settling ceiling part of the flash smelting furnace of Claim 5 or 6 joined to the said H steel by tap welding.   The H steel cooling structure in the settling ceiling part of the flash smelting furnace according to claim 5, wherein the heat radiating plate is made of copper.   The cooling structure of H steel in the settling ceiling part of the flash smelting furnace according to any one of claims 4 to 8, wherein the cooling water pipe is made of copper. Cooling structure of steel H in Settora ceiling of the flash smelting furnace according to any one of claims 4 to 9 having the cooling water tubes of the three furnace inward from the web portion of the H steel. A flash smelting furnace characterized in that a cooling member made of copper or stainless steel is brought into contact with H steel provided on a settling ceiling of the flash melting furnace and supporting the settling ceiling , and the H steel is cooled. Cooling method for H steel at the setra ceiling. The cooling member in contact with the furnace inner surface of the H steel web part is a cooling water pipe through which cooling water flows.
It said cooling member furnace in contact with the inner side of the flange portion of the H steel, a heat dissipation plate in contact with the steel H, in contact with the heat radiating plate, and claim 11, wherein the internal coolant is a cooling water pipe for circulating Method for cooling H steel in the settling ceiling of the flash smelting furnace. The cooling method of H steel in the settling ceiling part of the flash smelting furnace according to claim 12, wherein the cooling water pipe and the radiator plate are made of copper.

Images