KR20100083831A - Blast furnace bottom structure - Google Patents

Abstract

A blast furnace bottom structure has a furnace body (furnace bottom mantel (10)) built on a foundation (5), leg members (113) provided between the foundation (5) and the furnace body to form a horizontally extending gap (50) between the foundation (5) and the furnace body, and cooling pipes (118) as means for blocking transfer of heat from the furnace body to the foundation. Because the gap (50) is an air layer, it suppresses heat transfer, and heat transfer from the leg members (113) is suppressed by cooling by the cooling pipes (118). In demolition of the furnace body, the foundation (5) and the furnace body can be separated from each other by utilizing the gap (50).

Description

Blast furnace structure {BLAST FURNACE BOTTOM STRUCTURE}

This invention relates to the furnace structure of a blast furnace, and can be used for the blast furnace which builds a furnace body on a foundation.

The blast furnace is formed by constructing a furnace body on a foundation.

In the construction of the furnace body, a method of assembling the furnace body sequentially on the foundation of the installation site is also adopted, but in order to shorten the construction period, in recent years, the furnace body ring block is assembled in advance at another work site and returned to the installation site. The block construction method to fix is employ | adopted (refer patent document 1 etc.).

In this block method, the lowermost mantel of the no-ring ring block is constructed on the bottom beam, conveyed onto the foundation, and fixed after mounting on the foundation.

In addition, only the bottom part is assembled on-site on the foundation, and the other part of the furnace ring block is produced in parallel at the work site, transported to the installation site, and connected to the bottom part.

In the installation of the above-described noser mantle, it is common to mount the bottom beam on which the noser mantle is formed on the upper surface and to fill the mortar therebetween. The mortar solidifies to integrate the underlying foundation.

When constructing a nosers mantle on a foundation, a fire brick is laminated | stacked on the top panel (lower plate) of a bottom beam, and a mortar is filled underneath a top panel to transmit a load to a foundation. In this way, the foundation and the bottom part are integrated.

In the above-mentioned conventional bottom part structure, since the bottom part of a furnace body is integrated, there exists a problem that the heat in a furnace is easy to be transmitted to a base.

On the other hand, a water-cooled pipe is provided in the inside of a bottom beam and the surface of a base, or a water-cooled pipe is installed in a base even when a bottom beam is not used (refer patent document 2 etc.).

19 and 20 show a conventional water-cooled bottom part structure 90. 19 and 20 are longitudinal cross-sectional views viewed from directions perpendicular to each other. In each figure, the furnace body 91 is built on the bottom beam 92.

The bottom beam 92 has a frame on which the steel beams 93A and 93B are assembled in the cross direction to support the load of the furnace body 91 on the upper surface thereof. Cooling pipe 94A is arrange | positioned between the upper-shaped steel 93A, and the stamping material 96 is filled between these steel 93A and cooling pipe 94A. Cooling tubes 94B are disposed below the intervals of the lower steel sections 93B, and these sections 93B and the cooling tubes 94B are embedded in mortar 97 filled over the entire bottom beam 92. .

A pipe 95 from a cooling water supply source (not shown) is connected to the cooling pipes 94A and 94B, respectively, and cooling of the bottom beam 92 is performed by supplying cooling water from the pipe 95, and these shaped steels 93A, The heat from the furnace 91 is prevented from conducting to the underlying base by the heat insulating layer composed of the 93B) and the cooling tubes 94A and 94B.

In the blast furnace as described above, since the refractory bricks of the interior are worn out in accordance with the operation, regular repair is required. Also in such disassembly, the block method mentioned above is employ | adopted. Here, the removal method of the notch mantle which cut | disconnected the foundation horizontally by wire sawing etc. in order to separate a nozer part from the foundation is developed (refer patent document 3 etc.).

Japanese Patent Publication No. 2006-307319 Japanese Patent Laid-Open No. 6-158132 Japanese Patent Laid-Open No. 2006-183105

In the above-mentioned demolition method of the nosers mantle, since the foundation is cut horizontally, troublesome work cannot be avoided. In other words, the horizontal area to be cut is divided into a plurality of sections, the cutting by wire sawing is performed in each section, and the filling of spherical particles for reducing friction and load support when pulling out horizontally is required.

In addition, in the structure of the blast furnace bottom part described above, the heat of the furnace body is transferred to the foundation, and the deterioration of the foundation concrete is remarkable, and in order to avoid this, cooling piping is required over almost the entire surface of the foundation. Complexity, resulting in increased costs.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a blast furnace furnace structure that can be easily separated from the foundation part during removal and can efficiently suppress heat conduction to the foundation.

The furnace structure of the blast furnace of the present invention includes a foundation, a furnace body constructed on the foundation, a leg portion interposed between the foundation and the furnace to support the furnace body, and between the foundation and the furnace body by the leg portion. And a heat conduction shielding means for shielding the heat conduction formed in the horizontal direction and the heat conduction from the furnace body to the base.

In the present invention, the gap is formed between the base and the furnace body by supporting the furnace body by the legs. This gap can be, for example, a flat space extending in the horizontal direction. This space can be replaced by the horizontal cutting part which was constructed in the foundation in the conventional method of removing the body, and can greatly simplify or eliminate the cutting work in the removal.

Moreover, in the space | gap part, the air filled up becomes a heat insulation layer and can suppress the heat conduction from a furnace body to a base. In addition, by providing the heat conduction shielding means, it is possible to suppress or block the heat conduction via the legs. As a result, deterioration of the base material can be prevented by the heat of the furnace body, and large-scale water-cooled pipes and the like can be omitted.

Moreover, as a heat conduction shielding means, the method of forming a heat insulation layer in the surface or inside of the leg part which becomes a heat transfer path other than a space | gap part, the method of forming a heat insulation layer in the part which contacts the leg part of a foundation or a furnace body, etc. can be employ | adopted. .

As a heat insulation layer, the structure which shields heat conduction using a heat insulating material can be employ | adopted. As a heat insulating material, an existing material or structure may be used suitably.

As a heat insulation layer, the structure which shields heat conduction using a cooling apparatus, such as a system which cools a leg part, and a system which cools the part which contacts the leg part of a foundation or a furnace body, can be employ | adopted. In cooling, existing cooling means, such as a water cooling piping or an air cooling heat sink, can be employ | adopted.

In the case where the heat conduction shielding means is provided on the foundation, the expansion and contraction of the blast furnace may be provided at the time of the foundation construction.

When the heat conduction shielding means is provided in the furnace body, the ring block method may be used at the time of manufacture of the furnace block, and this can be applied to any expansion or contraction of the blast furnace. When constructing a furnace body on the foundation in the installation site of a blast furnace, what is necessary is just to provide a heat conduction shielding means in a bottom part in the process.

In the case where the heat conduction shielding means is provided in the leg portion, if the ring block method is used, it may be formed at the same time in manufacturing the nozzle block, or a leg portion provided with the heat conduction shielding means may be manufactured and connected to the lower surface of the nose block. When constructing a furnace body on a foundation in the installation site of a blast furnace, what is necessary is just to provide the leg part which has a heat conduction shielding means on a foundation during the process.

In the furnace structure of the blast furnace of this invention, it is preferable that the said leg part is formed in the lower surface of the said furnace body, and several pieces are arrange | positioned at predetermined space | intervals.

In the present invention, it is possible to install the legs in the lower surface of the furnace body in advance, it is possible to increase the work efficiency compared to the case of installing each time on the upper surface of the foundation at the installation site.

Moreover, it is necessary as a leg part to be able to ensure the strength sufficient for the load support of a furnace body.

In the furnace structure of the blast furnace of this invention, it is preferable that the space | interval of the said leg part is a space which can introduce an air caster to the said gap part between the said leg parts.

In the present invention, in the above-mentioned conveyance of the nosers mantle, for example, when moving from the dolly used for conveying onto the base, the air caster introduced into the air gap can be used smoothly and efficiently.

In the furnace structure of the blast furnace of this invention, it is preferable that the said heat conduction shielding means contains the cooling tube embedded in the site | part to which the said leg part of the said base upper surface is mounted.

In the furnace structure of the blast furnace of this invention, it is preferable to include the cooling tube embedded in the site | part to which the said leg part of the lower surface of the said furnace body is connected.

In this invention, a leg can be cooled by the cooling pipe of a foundation or a furnace, and it can reliably block the heat from a furnace body by this. At this time, the upper surface of the foundation or the lower surface of the furnace body requires the embedding of a cooling tube. However, since it is not the entire surface as in the prior art, it is effective for simplifying the structure and reducing the cost.

Such a cooling tube is not limited to either the base or the furnace, and may be formed on both the base and the furnace.

In the furnace structure of the blast furnace of this invention, it is preferable that the said heat conduction shielding means contains the cooling tube embedded in the said leg part.

In this invention, a leg can be cooled by the cooling tube provided in the leg itself, and it can reliably block the heat from a furnace body by this.

At this time, as a method of providing a cooling tube in the leg portion, the cooling tube can be attached to the side surface of the leg portion, and the following structure can be used.

In the furnace structure of the blast furnace of this invention, it is preferable that the said leg part is a block of steel, and the said cooling pipe is a through hole formed in the said block.

In the present invention, by using a forced block, rigidity as a leg portion can be easily ensured, and a cooling tube can be easily formed by drilling a through hole in the block. Since the steel block has a high thermal conductivity, it is unsuitable for shielding heat conduction itself, but the cooling of the entire block can be efficiently performed by forming the cooling tube integrally.

In the furnace structure of the blast furnace of the present invention, it is preferable that the leg portion is a block formed by injecting mortar into the formwork, and the cooling tube is formed by a pipe installed in the form before the mortar is injected.

In the present invention, it is possible to integrally mold up to the cooling tube by formwork of mortar, thereby facilitating manufacture. In addition, since most of them are mortar, the material cost can be reduced.

The heat conduction shielding means by the cooling tube of these leg parts may be coexisted with the heat conduction shielding means of the foundation or furnace mentioned above.

In the furnace structure of the blast furnace of the present invention, it is preferable that the furnace body has a bottom beam extending in a horizontal direction at the bottom thereof, and the furnace body is constructed on the foundation by mounting the bottom beam on the foundation.

In the present invention, by using the bottom beam, it is possible to produce a nodling mantle at the work site and to convey it to the foundation of the installation site.

In the furnace structure of the blast furnace of the present invention, it is preferable that the bottom beam has a lattice-shaped frame, an upper panel and a lower panel attached to the front and back of the frame, and the leg portion is connected directly under the frame.

In this invention, since the leg part is arrange | positioned in the part corresponding to the frame of a bottom beam, it can reliably support a furnace load.

The leg portion may be manufactured separately from the bottom beam and connected to the bottom surface of the bottom beam, but may be manufactured together with the frame at the time of manufacturing the bottom beam. Alternatively, the bottom beam may be integrated with the bottom beam. For example, if the bottom edge of the bottom beam frame extends below the panel, a gap may be formed between the frames projecting downward to form a leg portion.

In the furnace structure of the blast furnace of the present invention, it is preferable that the bottom beam has a mortar filled between the upper panel and the lower panel.

In the present invention, the rigidity of the frame can be increased by mortar filling the inner space of the bottom beam.

In the furnace structure of the blast furnace of the present invention, the bottom beam preferably has a hollow portion extending in a horizontal direction between the top panel and the bottom panel, and the heat conduction shielding means includes an air layer of the hollow portion.

In this invention, since the air layer extended horizontally is ensured by the hollow part formed in a bottom beam, this air layer acts as a heat insulation layer, and it can use this as a heat conduction shielding means.

In the furnace structure of the blast furnace of this invention, it is preferable that the said leg part is a hollow member, and the said heat conduction shielding means contains the air layer of the space inside the said leg part.

In this invention, since an air layer is ensured inside a leg part and this air layer acts as a heat insulation layer, it can use this as a heat conduction shielding means.

The air layer of the bottom beam or the air layer of the leg as the heat conduction shielding means has a lower shielding of heat conduction than the heat conduction shielding means by active cooling by the above-described cooling tube, but does not require peripheral devices or power for circulation of the refrigerant. Facility costs and operating costs can be reduced.

Therefore, the heat conduction shielding means by the air layer is used together with the heat conduction shielding means by the cooling tube mentioned above, and a cooling tube is provided in the part with large quantity of heat flow through, and an air layer is arrange | positioned in the other part. It is desirable to.

In the furnace structure of the blast furnace of this invention, it is preferable that the said heat conduction shielding means includes the air blower which distribute | circulates cooling air in the said air gap part, and includes the air layer of the said air gap part.

In this invention, the space | gap part does not remain to function as a heat insulation layer, but functions actively as a refrigerant | coolant path | pass, and can improve the shielding function of heat conduction.

In addition, the circulation of the cooling air of the space | gap part and the cooling by the cooling tube mentioned above can be used together.

In the furnace structure of the blast furnace of this invention, it is preferable that the said space part exists in the range of 60%-90% of the area ratio (porosity) with respect to the bottom area of the bottom face of the furnace body of the horizontal projection area in the formation part of the said space part.

In such a present invention, while being able to fully exhibit the heat insulation function of a space | gap part, the alternative function of the cutting construction at the time of removal mentioned above can also fully be exhibited.

Moreover, when the porosity is less than 60%, the heat insulation function by the space | gap part is not fully acquired. On the other hand, when the porosity exceeds 90%, there is a possibility that the supporting strength of the bottom part is not sufficient, which is not preferable. Therefore, it is preferable to make porosity between 60% and 90%.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the blast furnace of 1st Embodiment of this invention.
It is a schematic diagram which shows manufacture of the nodling mantle of the said 1st Embodiment.
It is a schematic diagram which shows conveyance of the nodling mantle of the said 1st Embodiment.
It is a schematic diagram which shows the transfer loading of the nodling mantle of the said 1st Embodiment.
5 is a partially broken plan view illustrating the bottom beam of the first embodiment.
It is sectional drawing which shows the principal part of the said 1st Embodiment.
It is sectional drawing which shows the principal part of 2nd Embodiment of this invention.
It is sectional drawing which shows the principal part of 3rd Embodiment of this invention.
It is sectional drawing which shows the leg member of the said 3rd Embodiment.
It is a perspective view which shows arrangement | positioning of the leg member of the said 3rd Embodiment.
It is sectional drawing which shows the principal part of 4th Embodiment of this invention.
It is sectional drawing which shows the principal part of 5th Embodiment of this invention.
It is sectional drawing which shows the principal part of 6th Embodiment of this invention.
It is sectional drawing which shows the principal part of 7th Embodiment of this invention.
It is sectional drawing which shows the principal part of 8th Embodiment of this invention.
It is sectional drawing which shows the principal part of 9th Embodiment of this invention.
It is sectional drawing which shows the principal part of 10th Embodiment of this invention.
It is sectional drawing which shows the principal part of 11th Embodiment of this invention.
19 is a cross-sectional view showing a conventional bottom part structure.
20 is a cross-sectional view showing a conventional bottom part structure.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing.

[First Embodiment]

In FIG. 1, the number of disassembly of the blast furnace 1 is divided into ring blocks 4 of a plurality of stages in the vertical direction by cutting the furnace body 3 built in the supporting column 2 in the horizontal direction and dividing them into the blast furnace. It is carried out out of the base 5 sequentially. On the other hand, the newly installed furnace 3 is constructed by manufacturing each ring block 4 at a plurality of work sites other than the installation site of the blast furnace and stacking them on the foundation 5.

Among the ring blocks 4 described above, the nosers mantle 10 is constructed by constructing the nosers structure 12 serving as the bottoms of the furnace 3 on the bottom beam 11.

As shown in FIG. 2, in the manufacture of the nosers mantle 10, a balance beam 13 is erected on the surface of the work site, and the bottom beam 11 is placed on the upper surface of the balance beam 13. Mount it. The balance beam 13 and the bottom beam 11 are each a structure structure which made the shape steel etc. grating | lattice-like.

An air caster 19 (see FIG. 4) may be introduced between the bottom beam 11 and the balance beam 13 to float the bottom beam 11 horizontally. Although an example of arrangement | positioning of the air caster 19 with respect to the planar shape of the bottom beam 11 is shown in FIG. 5, the arrangement method of the air caster 19 is not limited to this.

The bottom structure 11 is constructed in the upper surface of the bottom beam 11 comprised in this way.

In detail, the bar shell 15 serving as the outer circumference of the bottom plate 11, which is developed on the upper surface of the bottom beam 11, is placed upright, and a stave cooler inside the bar shell 15 ( 16), and the refractory material 17, such as a bottom brick or carbon brick, is laminated | stacked on the upper surface of the bottom plate 14 through a joint filler. In this state, the weight of the nosers mantle 10 becomes about 1000 tons or more, and in order to construct the nosers mantle 10 on the balance beam 13 installed at the work site, the balance beam 13 is provided with sufficient rigidity. Prevent deformation of the nosers mantle 10.

If it is possible to manufacture the nosers mantle 10 at the work site, as shown in FIG. 3, the dolly 18 is transported to the side of the foundation 5 at the installation site using a dolly 18 which is a large-scale heavy material transport cart. That is, the dolly 18 is connected in a conveying direction (length direction) to form a plurality of dolly rows, and the formed plurality of dolly rows are introduced into the gap formed between the balance beam 13 and the ground surface in parallel, and the hydraulic pressure of the dolly is Is operated to raise the balance beam 13 and convey it to the side of the foundation 5.

In the transfer stacking to the base 5, as shown in FIG. 4 and FIG. 5, the air caster 19 introduced into the bottom beam 11 is used. That is, after horizontally attaching the balance beam 13 which attached the nozzle mantle 10 to the base 5 by the dolly 18, the air caster 19 is started and the bottom beam 11 is balanced beam 13 ), And in this state, it is conveyed and mounted on the base 5 by applying a horizontal force to the notch mantle 10 with a winch or the like.

5, the planar shape of the bottom beam 11 of this embodiment is shown, and in FIG. 6, the lower structure of the noser mantle 10 of this embodiment is enlarged.

In FIG. 5, the bottom beam 11 of this embodiment is equipped with 11 A of rectangular main-body parts, and the extended part 11B which protruded in the both sides.

The bottom beam 11 has a lattice-shaped frame as a basic structure. The frame is formed by arranging a plurality of long H-shaped steels 111 in parallel and connecting them with a main beam 110 made of the same form steel. Here, in the main body portion 11A, two H-shaped steels 111 are arranged in a pair to constitute the main beam 111A, and in the expanded portion 11B (parts on both sides in FIG. 5), the H-shaped steels ( 111 alone constitutes the main beam 111B. This is set in consideration of the small one because the load per unit area of the nodling mantle 10 built on the bottom beam 11 is large at the main body portion 11A and the side edge at the expanded portion 11B.

As shown in FIG. 6, in 11 A of main-body parts, the leg member 113 is provided in the lower surface of the main beam 111A, and the bottom plate 112 is provided between 111 A of main beams. In the extended part 11B, the leg member 113 is provided in the lower surface of the main beam 111B, and the bottom plate 112 is provided between the main beam 111B and the adjacent main beam 111A. The bottom surface of the bottom beam 11 is covered with the whole surface by these leg members 113 and the bottom plate 112. As shown in FIG.

Mortar 114 is filled between the main beams 111A and 111B. The filling of the mortar 114 reaches a level below a predetermined height of the upper flanges of the main beams 111A and 111B, and the cooling tube 116 and the auxiliary beam 115 are arranged on the upper surface of the mortar 114.

The auxiliary beam 115 has the same height as the main beams 111A and 111B. The stamp material 117 is filled between the auxiliary beams 115, and the cooling pipe 116 is embedded by the stamp material 117. The upper surface of this stamping material 117 is also at the same level as the main beams 111A and 111B.

The upper surfaces of the bottom beams 11 are formed horizontally by the upper surfaces of the main beams 111A and 111B, the auxiliary beams 115 and the stamp material 117.

The above-described bottom structure 12 is constructed by spreading the bottom plate 14 on the top surface of the bottom beam 11 and sequentially connecting the shells 15.

In the above-described bottom beam 11, the total load including the nodular structure 12 is supported by the leg member 113. The leg member 113 is supported by the balance beam 13 placed in the work site at the manufacturing stage, and supported by the foundation 5 after being conveyed to the installation site.

For this reason, the leg member 113 is comprised from the material with large enough load capacity. Specifically, steel plates or blocks are used.

The receiving member 51 is provided in the site | part in which the leg member 113 is installed in the base 5. That is, the foundation 5 is made of a reinforced concrete structure, for example, but the receiving member 51 is buried at the time of composition of the foundation 5 or the like. However, you may embed after concrete curing of the foundation 5. Even if the load of the nodling mantle 10 concentrates on the leg member 113 part by this accommodating member 51, the load can be distributed by the accommodating member 51, and the crack of the concrete of the foundation 5, etc. are not generated. You can do that. Moreover, it is preferable to add a back muscle to the part adjacent to the accommodating member 51 among concrete of the base 5, especially the part immediately below, so that a crack etc. may not arise.

In this embodiment, the leg member 113 is a leg part of this invention, and the space | gap of the thickness according to the height of the leg member 113 between the upper surface of the base 5 and the bottom plate 112 of the bottom beam 11 is carried out. The part 50 is formed.

In this embodiment, the porosity (the area ratio of the area of the space | gap part which occupies for the whole bottom area) of the space | gap part 50 in the bottom shape of the bottom beam 11 is between 60%-90%.

The air caster 19 is introduced into the air gap 50 in the transfer stacking to the base 5 of the notch mantle 10, and the upper surface of the air caster 19 is raised to lift the nodling mantle 10. Is done.

For this reason, the height of the leg member 113 is set according to the thickness of the air caster 19 mentioned above. That is, the thickness of the space | gap part 50, ie, the height of the leg member 113, is set larger than the height of the air caster 19 at the time of introduction, and smaller than the height of the air caster 19 of an operation state.

In addition, the space | interval of the leg member 113, ie, the width | variety of the space | gap part 50, becomes larger than the width | variety of the air caster 19 which introduces. When the normal air caster 19 is assumed, the interval of the leg member 113 is preferably 1600 to 3000 mm. If this is smaller than 1600 mm, it is difficult to enter and exit the air caster 19 due to interference. On the other hand, when it is larger than 3000 mm, the bending stress exerted on the bottom beam 11 between the leg members 113 may become large, and there exists a possibility that an undesired effect may be caused by a bending by bending.

On the upper surface of the base 5, an air caster rail 52 having a smooth surface is provided between the receiving members 51 so that the air caster 19 during operation can slide smoothly.

After being transported to the foundation 5, the air caster 19 is drawn out of the air gap 50. In this state, the gap 50 is kept in space. Here, the space | gap part 50 is a series of space formed between the leg members 113, and penetrates in the up-down direction of FIG. For this reason, appropriate ventilation is obtained in the space | gap part 50, and the cooling effect of the lower surface of the bottom beam 11, and the upper surface of the base 5 can be acquired by this ventilation.

In order to improve this cooling effect, the fan 50A which blows through the space | gap part 50 along the periphery of the base 5 is provided. The fan 50A may exhaust the air from the cavity 50. A fan for blowing air may be provided at one end of the cavity 50, and a fan for exhausting air may be provided at the other end.

It is preferable that the flow velocity of the air flow formed in the space | gap part 50 by 50 A of fans is 10-30 m / sec. If the flow rate is less than 10 m / sec, there is a possibility that the surrounding refractory material, mortar, or the like is insufficiently cooled, and the life may be shortened. If the flow rate is greater than 30 m / sec, the operating cost of the fan 50A becomes high and the heat absorption by the ventilation is not sufficient, resulting in a decrease in cooling efficiency.

In the present embodiment, the bottom beam 11 is provided with a cooling tube 118 as heat conduction shielding means.

The cooling tube 118 receives the circulation of the cooling water from the same cooling water supply source (not shown) as the cooling tube 116 mentioned above, and performs surrounding cooling. Here, the cooling tube 116 is embedded in the upper portion of the bottom beam 11 to cool the entire upper surface of the bottom beam 11. On the other hand, the cooling pipe 118 is embedded in the lower part of the bottom beam 11 so as to surround the installation site of the leg member 113 and heat conduction from the leg member 113 to the base 5 by cooling the leg member 113. It is supposed to block.

As the cooling tubes 118 and 116, piping materials having nominal diameters 25A to 50A can be used.

The flow rate of the cooling water passing through the cooling tubes 118 and 116 is preferably 1 to 5 m / sec. If the flow rate is less than 1 m / sec, cooling of the surrounding refractory material, mortar, etc. may be insufficient, and the life may be shortened. If the flow rate is greater than 5 m / sec, the operating cost for circulating the cooling water becomes high, and the endotherm by the cooling water is not enough, thereby lowering the cooling efficiency.

According to this present embodiment, the following effects are obtained.

That is, since the bottom beam 11 is supported only by the leg member 113 with respect to the foundation 5 and the void 50 is left as an air layer, the void 50 serves as a heat conduction shielding means. Heat becomes difficult to conduct through the voids 50. On the other hand, cooling of the leg member 113 by the cooling tube 118 also prevents heat of the furnace body from being transferred to the base 5 via the leg member 113. As a result, heat conduction to the foundation 5 is shielded to prevent deterioration of the concrete of the foundation 5, and a cooling structure or the like that has been necessary in the past can be simplified.

In addition, the noser mantle 10 is mounted on the foundation 5 by the leg member 113, and in other areas occupying most of the bottom surface, the noser mantle 10 and the foundation 5 are previously formed in the air gap 50. Operation as a blast furnace is made in the partitioned state. Therefore, when dismantling the furnace mantle 10 in dismantling of the blast furnace, it is possible to separate the furnace mantle 10 from the foundation 5 using the air gap 50 so that the horizontal cutting operation of the foundation 5 as in the prior art is performed. Can be omitted.

In addition, this invention is not limited to the said embodiment, Other embodiment, a deformation | transformation, etc. which are described below are also included in this invention.

In the said 1st Embodiment, although the cooling pipe 118 was provided in the lower part of the bottom beam 11 along the leg member 113 as a heat conduction shielding means, you may provide a cooling pipe in the base 5.

[2nd Embodiment]

In FIG. 7, this embodiment has the structure similarly to the said 1st Embodiment fundamentally. However, in this embodiment, the bottom beam 11 is not provided with the cooling pipe 118, but instead, the cooling pipe 53 as a heat conduction shielding means is buried along the accommodating member 51 of the base 5 It is.

In such an embodiment, the accommodating member 51 is cooled by the cooling tube 53, and the leg member 113 is also cooled through the accommodating member 51. Therefore, the heat conduction from the leg member 113 is shielded by the cooling tube 53 as a heat conduction shielding means.

You may employ | adopt both such a cooling tube 53 of the base 5 side, and the cooling tube 118 of the bottom beam 11 side mentioned above as a heat conduction shielding means.

[Third Embodiment]

In addition, it is good also as a structure which cools itself by embedding a cooling pipe in the leg member 113 itself.

In FIG. 8, this embodiment has the structure similarly to the said 1st Embodiment fundamentally. However, in the present embodiment, the bottom beam 11 is not provided with the cooling pipe 118, and instead, the cooling pipe 119 as the heat conduction shielding means is embedded in the leg member 113 itself.

In such an embodiment, the leg member 113 is cooled from the inside by the cooling tube 119. Therefore, heat conduction from the leg member 113 is shielded by the cooling tube 119 as the heat conduction shielding means.

The cooling tube 119 of the leg member 113 is heat-conducted together with either or both of the cooling tube 53 on the base 5 side and the cooling tube 118 on the bottom beam 11 side described above. You may employ | adopt as a shielding means.

The leg member 113 incorporating the cooling tube 119 can be manufactured as follows.

In Fig. 9, a flat and long block-shaped steel material is used as the base material of the leg member 113, and the through hole is formed in the steel pipe by forming a through hole extending in the longitudinal direction. ) Can be used as.

As the base material of the leg member 113, a concrete molded article having a block shape of a flat and long shape can be used. Specifically, a formwork having an inner shape of a desired block shape may be prepared, and concrete may be injected and solidified therein. When the cooling tube 119 is formed in such a leg member 113, a pipe | tube material is provided in the form before shaping | molding, and what is necessary is just to fill concrete around it.

The leg member 113 is fixed to the bottom surface of the bottom beam 11.

As shown in FIG. 10, the leg member 113 is connected continuously in the longitudinal direction. At this time, the space | gap part 50 which the air caster 19 can enter is formed between the leg member 113, as described in the said 1st Embodiment.

In the bridge member 113, a series of cooling tubes traversing the bottom beam 11 can be formed by sequentially communicating the cooling tubes 119 built in each of the interconnections.

In each of the above-described embodiments, the air gap serves as a heat conduction shielding means by the air layer and shields heat conduction through the leg portion. The leg part or its vicinity was cooled using the cooling tube provided in one or the combination of these cooling tubes.

In the present invention, the heat conduction shielding means for shielding heat conduction through the legs is not limited to performing active cooling as in the above-described embodiments, and the heat conduction shielding is provided by forming a heat insulation layer such as an air layer having high heat insulation. good.

[Fourth Embodiment]

In FIG. 11, this embodiment has the structure similarly to the said 1st Embodiment fundamentally. In the present embodiment, however, the cooling tube 118 (see FIG. 6) described above is not provided below the bottom beam 11. In addition, filling of the mortar 114 is also abbreviate | omitted, and the area | region from the middle of the bottom beam 11 to a lower surface becomes hollow part 114A.

In this embodiment, the heat from the bottom structure 12 is cooled by some cooling tubes 116 and then tries to conduct downwardly through the layers of the auxiliary beam 115 and the stamp material 117. Here, some of the heat conduction reaches the leg portion 113 through the main beams 111A and 111B, but heat conduction through the hollow portion 114A is shielded since the hollow portion 114A is an air layer.

Thus, although active cooling is not performed in this embodiment, the heat conduction from the leg member 113 can be shielded by the hollow part 114A as a heat conduction shielding means.

In this embodiment, since active cooling by the refrigerant passing through the cooling pipe is not performed, the device configuration can be simplified, and the equipment cost and the running cost can be reduced.

In addition, the heat conduction shielding means by the hollow part 114A may be used together with the other heat conduction shielding means mentioned above. For example, in FIG. 11, the leg member 113 may be attached to the cooling tube 119 (refer to FIG. 8) to cool the leg portion. In this case, although the circulation device of the refrigerant is required, the hollow portion 114A as the heat conduction shielding means can reduce the cooling performance in the circulation device of the refrigerant, thereby reducing the installation cost and the operating cost.

[Fifth Embodiment]

In FIG. 12, this embodiment has the structure similarly to the said 1st Embodiment fundamentally. In the present embodiment, however, the cooling tube 118 (see FIG. 6) described above is not provided below the bottom beam 11. In addition, the filling of the mortar 114 also becomes the upper half part, and the lower half part of the bottom beam 11 becomes the hollow part 114A.

Specifically, the web portion of the main beams 111A and 111B is provided with an intermediate plate 112A at its mid-height position, the mortar 114 is filled thereon, and the hollow portion 114A below it. )

In addition, in this embodiment, the hollow part 113A is formed also in the leg part.

Specifically, the lower ends of the main beams 111A and 111B of the bottom beam 11 are in direct contact with the housing member 51. In the web portion of the main beams 111A and 111B, the bottom plate 112 is provided at a predetermined height from the lower ends of the main beams 111A and 111B. For this reason, the lower ends of the main beams 111A and 111B project downward from the bottom plate 112, and the protruding portions form the leg portions, and the void portions 50 are formed around the bottom portions.

In this embodiment the heat from the bottom structure 12 is cooled by some cooling conduits 116 and then passes through the layers of the auxiliary beam 115 and the stamping material 117 and through the layers of mortar 114. I try to be evangelized downward. However, since the hollow portion 114A is an air layer, heat conduction through the hollow portion 114A is shielded. Part of the heat conduction reaches the leg portion through the main beams 111A and 111B, but since the hollow portion 113A is formed in the leg portion, heat conduction through the leg portion is also suppressed.

In this embodiment as well, active cooling is not performed, but heat conduction through the legs can be shielded by the hollow portions 114A and 113A as the heat conduction shielding means. And since active cooling by the refrigerant | coolant which passes through a cooling pipe is not performed, an apparatus structure can be simplified and facility cost and operation cost can be reduced.

In addition, the heat conduction shielding means by the hollow parts 114A and 113A may be used together with the other heat conduction shielding means mentioned above. For example, instead of the leg member 113 in FIG. 6 or 7, the main beams 111A and 111B may be extended to be a leg portion having the hollow portion 113A. In this case, the circulation device of the refrigerant to the cooling pipes 118 and 53 is required, but the hollow part 113A as the heat conduction shielding means in the leg portion can reduce the cooling performance of the refrigerant circulation device. Therefore, the installation cost and the operation cost can be reduced accordingly.

In each of the first to fifth embodiments described above, the nosing mantle 10 was assembled in advance outside the installation site of the blast furnace 1, and the system was transported and installed on the foundation 5 to be installed. . For this purpose, the bottom beam 11 for securing the bottom strength required for transfer loading was used, and the noser mantle 10 was assembled thereon.

On the other hand, the method of assembling the nosers mantle 10 on the foundation 5 which is the installation site of the blast furnace 1 may be employ | adopted. In this manner, although the bottom beam 11 is not used, the present invention can be implemented by configuring the leg portion, the void portion, and the heat conduction shielding means according to the present invention.

[Sixth Embodiment]

In FIG. 13, the foundation 5 is constructed of concrete or the like at the installation site of the blast furnace 1. The leg member 113 is intermittently arrange | positioned on the base 5, and the shaped steel material 111 is assembled on it. The bottom plate 14 is provided on the upper surface of the shaped steel 111, and the layer of mortar 114B is formed in the lower surface side of the space | interval part of the shaped steel 111. As shown in FIG. The cooling tube 116 is arrange | positioned at the upper surface of the mortar 114B, and the mortar 114 is filled so that the cooling tube 116 may be filled between the upper surface of the mortar 114B and the bottom plate 14. FIG.

The bottom structure is formed by these shape steel materials 111, mortar 114B, mortar 114, and the bottom plate 14. As shown in FIG. This nod structure is surrounded by a nod mantle 10. The nosers mantle 10 is fixed to the foundation 5.

In addition, as a layer of mortar 114B, the mortar formed into the slab shape previously may be supported at the lower end of the shaped steel 111 in a separate place, or the formwork may be temporarily fixed to the lower surface of the shaped steel 111 You may charge the mortar.

In this embodiment, the space | gap part 50 which spaces the upper surface of the base 5 and the lower surface of the bottom structure (lower surface of the mortar 114B) between the leg members 113 at predetermined intervals is formed. The air gap 50 functions as a heat conduction shielding means for shielding heat in the furnace by the air layer. In addition, the cooling tube 116 embedded in the furnace structure functions as a heat conduction shielding means for shielding heat transferred from the furnace to the foundation 5 by cooling the surrounding mortars 114 and 114B. In this embodiment, the cooling pipe 116 is provided in the low position compared with each said 1st-5th embodiment mentioned above, and is effective also in cooling the leg member 113. As shown in FIG.

Also in this embodiment, heat conduction shielding other than a leg part is performed by the space | gap part 50 which also serves as a heat conduction shielding means, and heat conduction shielding through a leg part is carried out by the cooling pipe 116 which is a heat conduction shielding means. Is done.

Thus, even in the structure which does not use the bottom beam 11, the effect by the structure based on this invention can be acquired.

[Seventh Embodiment]

It is good also as a structure which cools the leg member 113 by embedding the cooling pipe 53 in the base 5 about the structure of the said 6th embodiment.

In FIG. 14, this embodiment basically has the same configuration as in the sixth embodiment. However, in this embodiment, the cooling pipe 53 is embedded in the upper surface vicinity of the base 5, and it is set as the structure which cools the leg member 113. As shown in FIG. As the cooling tube 53 embedded in the base 5, the structure demonstrated by 2nd Embodiment mentioned above can be used.

In such an embodiment, the leg member 113 is cooled by the cooling tube 53. Therefore, the heat conduction from the leg member 113 is more effectively shielded by the cooling tube 53 as the heat conduction shielding means.

[Eighth Embodiment]

About the structure of the said 6th embodiment, you may make the structure which embeds the cooling pipe 119 in the leg member 113 itself, and cools itself.

In FIG. 15, this embodiment has the structure similarly to the said 6th embodiment fundamentally. However, in this embodiment, the cooling pipe 119 as a heat conduction shielding means is embedded in the leg member 113 itself. As the leg member 113 having the cooling tube 119, the one described in the above-described third embodiment can be used.

In such an embodiment, the leg member 113 is cooled from the inside by the cooling tube 119. Therefore, the heat conduction from the leg member 113 is more effectively shielded by the cooling tube 119 as the heat conduction shielding means.

[Ninth Embodiment]

About the structure of the said 6th embodiment, you may make it the structure which hold | maintains the layer of mortar 114B by providing the bottom plate 14 like a top surface on the lower surface of the shaped steel material 111. As shown in FIG.

In FIG. 16, this embodiment has the structure similarly to the said 6th embodiment fundamentally. However, in this embodiment, the bottom plate 14 similar to the bottom plate 14 provided in the upper surface of the shaped steel material 111 is provided also in the lower surface of the shaped steel material 111. As shown in FIG. The mortar 114B is filled on this lower bottom plate 14, and the cooling pipe 116 is arrange | positioned similarly to the said 6th embodiment, and the mortar 114 is filled on it.

In this embodiment, the mortar 114B can be hold | maintained by the lower bottom plate 14, and the layer of mortar 114B can be filled by this, and the space | interval part of the steel material 111 can be filled reliably. Can be.

[Tenth Embodiment]

It is good also as a structure which cools the leg member 113 by embedding the cooling pipe 53 in the base 5 about the structure of the said 9th embodiment.

In FIG. 17, this embodiment basically has the same configuration as in the ninth embodiment. However, in this embodiment, the cooling pipe 53 is embedded in the upper surface vicinity of the base 5, and it is set as the structure which cools the leg member 113. As shown in FIG. As the cooling tube 53 embedded in the base 5, the structure demonstrated by 2nd Embodiment mentioned above can be used.

In such an embodiment, the leg member 113 is cooled by the cooling tube 53. Therefore, the heat conduction from the leg member 113 is more effectively shielded by the cooling tube 53 as the heat conduction shielding means.

[Eleventh Embodiment]

About the structure of the said 9th embodiment, you may make the structure which embeds the cooling pipe 119 in the leg member 113 itself, and cools itself.

In FIG. 18, this embodiment has the structure similarly to the said 9th embodiment fundamentally. However, in this embodiment, the cooling pipe 119 as a heat conduction shielding means is embedded in the leg member 113 itself. As the leg member 113 having the cooling tube 119, the one described in the above-described third embodiment can be used.

In such an embodiment, the leg member 113 is cooled from the inside by the cooling tube 119. Therefore, the heat conduction from the leg member 113 is more effectively shielded by the cooling tube 119 as the heat conduction shielding means.

[Other Embodiments]

In each said embodiment, although the cooling pipe 118, the cooling pipe 119, or the cooling pipe 53 which cools the leg member 113 was employ | adopted as a heat conduction shielding means, you may employ | adopt other cooling means.

For example, a so-called heat sink having a plurality of fins formed of a material having high thermal conductivity other than cooling by a cooling tube circulating the cooling water may be mounted on the surface of the leg member 113. By the heat sink, the leg member 113 can be cooled by the cooling air passing through the air gap 50, and the heat conduction from the leg member 113 can be shielded.

Alternatively, another configuration capable of shielding heat conduction via the leg member 113 may be adopted, and the leg member 113 is a block formed of a material having high heat insulation, and has a heat conduction shielding effect on its own. You may also However, as mentioned above, since the high load capacity is requested | required of the leg member 113, it is preferable to employ | adopt the structure similar to each embodiment mentioned above.

In the said embodiment, although the furnace body 3 and the supporting column 2 were provided in the blast furnace 1, it is preferable to set it as the structure which does not join the furnace body 3 and the supporting column 2 at the time of operation. By not joining the furnace body 3 and the supporting column 2 at the time of operation, the influence of unnecessary relative displacement between the furnace body 3 and the supporting column 2 can be avoided by the thermal behavior during blast furnace operation.

In addition, when an earthquake occurs between the furnace body and the foundation, there is a possibility that relative displacement due to mutual sliding occurs. However, according to the detailed examination of the present inventors, in the blast furnace furnace to which the present invention is concerned, the slipping force between the foundation and the leg portion is determined even when the earthquake occurs at the "stationary friction coefficient> shear force at earthquake." Coefficient ”, the blast furnace main body stably becomes independent and the problem of slipping is avoided. According to the experimental results of the present inventors, the static friction coefficient is 0.64 to 0.73, the shear force coefficient at earthquake force is 0.2 (for Kanto), and there is a sufficient difference in both coefficients so that slippage does not occur in the furnace body and the base.

[Industrial Availability]

The present invention can be used as a bottom structure of a blast furnace, and can be used for a blast furnace for constructing a furnace body on a foundation.

One … Blast furnace 2. Support column
3…. Nose 4. Ring block
5 ... Basic 10. North Mantle
11 ... Bottom beam 11B. Extension part
11A. Body part 12... Nozer structure
13 ... Balance beam 14... Bottom plate
15 ... 16. Stave cooler
17. Fireproof 18. Dolly
19. Air caster 50A Pan
50…. Void 51. Receiving member
52... Air caster rail 53. Cooling line (heat conduction shield)
110. Main beam 111... Section steel
111A, 111B. Main beam 112. Bottom plate
113. Leg member (leg) 113A. Hollow part (heat conduction shielding means)
114,114B. Mortar 114A. Hollow part (heat conduction shielding means)
115. Auxiliary beam 116... Cooling tube
117. Stamp material 118,119. Cooling line (heat conduction shield)

Claims (15)

Foundation;
A furnace body built on the foundation;
A leg part interposed between the base and the furnace body to support the furnace body;
A gap portion extending in a horizontal direction formed between the base and the furnace body by the leg portion; And
The furnace structure of the blast furnace characterized by including heat conduction shielding means for shielding heat conduction from the furnace body to the base. The method of claim 1,
The leg part is formed in the lower surface of the furnace body, and a plurality of furnace bottom structure, characterized in that arranged at a predetermined interval. The method of claim 2,
The gap of the leg portion is a furnace structure of the blast furnace, characterized in that the gap between the leg portion can be introduced into the air caster. The method according to any one of claims 1 to 3,
The heat conduction shield means is a blast furnace structure, characterized in that it comprises a cooling tube embedded in the site where the leg portion of the upper surface of the base is mounted. The method according to any one of claims 1 to 4,
And the heat conduction shielding means comprises a cooling tube embedded in a portion supported by the leg portion of the lower surface of the furnace body. 6. The method according to any one of claims 1 to 5,
And the heat conduction shielding means comprises a cooling tube embedded in the leg portion. The method according to claim 6,
The leg is a block of force;
The cooling pipe is a bottom structure of the blast furnace, characterized in that the through hole formed in the block. The method according to claim 6,
The leg portion is a block formed by injecting mortar into the formwork;
The cooling pipe is a furnace structure of the blast furnace, characterized in that formed before the injection of the mortar by a pipe installed in the formwork. The method according to any one of claims 1 to 8,
The furnace body has a bottom beam extending in a horizontal direction at a bottom thereof;
The furnace structure of the blast furnace characterized in that the furnace body is built on the foundation by mounting the bottom beam on the foundation. The method of claim 9,
The bottom beam has a frame on a lattice, and an upper panel and a lower panel attached to the front and back of the frame;
The bottom structure of the blast furnace, characterized in that the leg portion is connected directly under the frame. The method of claim 10,
And the bottom beam has a mortar filled between the upper panel and the lower panel. The method of claim 10 or 11,
The bottom beam has a hollow portion extending in a horizontal direction between the top panel and the bottom panel;
And the heat conduction shielding means comprises an air layer of the hollow part. The method according to any one of claims 1 to 12,
The leg portion is a hollow member;
And the heat conduction shielding means comprises an air layer in the inner space of the leg portion. The method according to any one of claims 1 to 13,
The heat conduction shield means includes a blower configured to include an air layer in the void portion and to distribute cooling air to the void portion. The method according to any one of claims 1 to 14,
The void portion structure of the blast furnace, wherein the void portion has an area ratio (porosity) with respect to the bottom area of the bottom face of the furnace body in a horizontal projected area at the formation portion of the void portion.

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