WO2015019704A1

WO2015019704A1 - Hot-blast stove construction method

Info

Publication number: WO2015019704A1
Application number: PCT/JP2014/065563
Authority: WO
Inventors: 陽椎野; 和美倉吉; 典正前川
Original assignee: 新日鉄住金エンジニアリング株式会社
Priority date: 2013-08-06
Filing date: 2014-06-12
Publication date: 2015-02-12
Also published as: TW201518666A; BR112016002453B1; RU2615383C1; BR112016002453A2; EP3031933A1; KR20160040594A; KR101804829B1; CN105452491A; EP3031933A4; TWI608210B; JP2015030907A; JP5469774B1; EP3031933B1

Abstract

A hot-blast stove construction method in which: the furnace body comprises an iron shell (4) and a lining (5) formed on the inside of the iron shell (4); and the lining (5) comprises a refractory castable (51) disposed inside the iron shell (4), heat-insulating brick (52) disposed inside the refractory castable (51), and firebrick (53) disposed inside the heat-insulating brick (52). The heat-insulating brick (52) and the firebrick (53) are disposed inside the iron shell (4) with spaces therebetween and the refractory castable (51) is injected and solidified between the iron shell (4) and the heat-insulating brick (52).

Description

How to build a hot stove

The present invention relates to a method for constructing a hot stove, and relates to a method for constructing a hot stove for supplying hot air to a blast furnace.

Conventionally, a hot stove has been used as equipment for supplying hot air to a blast furnace for iron making.
Multiple hot blast furnaces (3 to 5) are installed for each blast furnace, and heat is stored in one of them, and hot air is supplied to the blast furnace, so that hot air can be continuously supplied to the blast furnace. It has become.
Each hot stove has a combustion chamber in which a burner for heating is installed, and a heat storage chamber filled with checker bricks as a heat storage medium. And as a heat storage operation | movement, a fuel is burned in a combustion chamber, a hot air is produced | generated, this hot air is passed through a heat storage chamber, and heat is stored in the checker bricks piled up inside the heat storage chamber. Further, as a blowing operation, the outside air is heated through the heat storage chamber, and hot air heated to about 1200 ° C. to 1400 ° C. is supplied to the blast furnace.

As such a hot stove, an external combustion type in which a combustion chamber and a heat storage chamber are constructed in separate furnace bodies and an internal combustion type in which the combustion chamber and the heat storage chamber are collectively accommodated in the same furnace body are used.
FIG. 24 shows an external combustion type hot stove 1 as an example. The hot stove 1 is an external combustion type in which a combustion chamber and a heat storage chamber are separated, and has two furnace bodies, a combustion chamber furnace body 2 and a heat storage chamber furnace body 3. In addition, the illustrated hot stove 1 is one for a plurality of installed hot blast furnaces.

Inside the combustion chamber furnace body 2, a burner 21 is formed at the furnace bottom portion. The burner 21 mixes and burns the fuel gas introduced into the fuel gas introduction part 22 and the air introduced into the air introduction part 23, and generates high-temperature combustion gas that flows toward the top of the furnace.
On the side surface of the combustion chamber furnace body 2, a hot air supply unit 24 leading to the blast furnace is installed. The combustion chamber furnace body 2 is connected to the furnace top portion of the heat storage chamber furnace body 3 by a connecting pipe 25.
A checker brick 31 as a heat storage medium is stacked in the heat storage chamber furnace body 3. The checker bricks 31 are stacked without any gap from the furnace bottom portion of the heat storage chamber furnace body 3 to the vicinity of the furnace top. The checker bricks 31 are stacked such that a large number of ventilation holes are formed therethrough and the ventilation holes communicate with each other. Therefore, in many stacked checker bricks 31, the heat storage chamber furnace body 3 can be ventilated from the furnace bottom part to the furnace top part.
An intake / exhaust port 32 opened to the outside is formed in the furnace bottom portion of the heat storage chamber furnace body 3.

In such a hot stove 1, heat storage and ventilation are performed as follows.
In the heat storage operation, the fuel gas is burned by the burner 21 to generate the combustion gas that rises in the combustion chamber furnace body 2, and this combustion gas is introduced into the heat storage chamber furnace body 3 from the connecting pipe 25. Then, the introduced combustion gas is passed downward through the checker brick 31, and the heat of the combustion gas is stored in the checker brick 31 during that time. The combustion gas that has passed through the checker brick 31 is discharged from the intake / exhaust port 32.
During the air blowing operation, outside air is sucked into the heat storage chamber furnace body 3 through the intake / exhaust port 32, and the sucked outside air is passed upward through the checker brick 31 while being stored in the checker brick 31. The outside air is heated with heat to generate hot air, and this hot air is introduced into the combustion chamber furnace body 2 from the connecting pipe 25 and supplied from the hot air supply unit 24 to the blast furnace.

In such a hot stove 1, the combustion chamber furnace body 2 and the regenerative chamber furnace body 3 are both formed of a cylindrical iron skin 4 whose outer shell is protected from the high temperature inside the furnace. A lining 5 is formed.
FIG. 25 shows the lining 5 of the combustion chamber furnace body 2.
The lining 5 includes a castable 51 formed on the inner surface of the iron skin 4, a heat insulating brick 52 stacked on the inside thereof, and a refractory brick 53 stacked on the inside thereof. The inside of the refractory brick 53 is a cavity, and this cavity becomes an air path in the combustion chamber furnace body 2.

In the lining 5, for example, an expansion margin portion 54 is formed between a layer of heat insulating brick 52 and a layer of refractory brick 53.
When a newly built hot blast furnace 1 is ignited, the refractory brick 53 may thermally expand greatly and may be displaced radially outward of the furnace body to interfere with the heat insulating brick 52. On the other hand, the thermal expansion of the refractory brick 53 is provided as shown in FIG. 26 by providing an expansion margin portion 54 continuous in the circumferential direction of the furnace body between the layer of the heat insulating brick 52 and the layer of the refractory brick 53. Is allowed at the expansion margin 54 (see Patent Document 1).

When such an expansion allowance portion 54 is provided, it is not preferable to leave it as a simple gap because it becomes a leak gas passage. For this reason, in the expansion allowance portion 54, the gap is filled with a flexible and irregular shaped filler (filler) such as ceramic fiber or foamed plastic, or a foamable filler is injected and foamed to fill every corner. After that, it is solidified and held in the gap. Even when the foamable filler is solidified, the solidified foamable filler is sufficiently soft and does not hinder the thermal expansion of the refractory bricks 53 as in the case of the soft and irregular shaped filler.
Such an expansion margin portion 54 is not limited to be formed between the layer of the heat insulating brick 52 and the layer of the refractory brick 53 but may be formed between the layer of the heat insulating brick 52 and the castable 51.

FIGS. 27 and 28 show different structures of the lining 5 of the combustion chamber furnace body 2.
In each figure, the expansion margin part 54 as shown in FIG. 25 is not formed between the layer of the heat insulating brick 52 and the layer of the refractory brick 53. On the other hand, gaps are formed between the refractory bricks 53 arranged in the circumferential direction of the furnace body, and an expansion allowance portion 54 that is continuous in the radial direction of the furnace body is formed by the gaps. By having such an expansion allowance portion 54, even when the refractory brick 53 is thermally expanded, the expansion allowance can be allowed, and the refractory brick 53 can be prevented from being displaced radially outward. Therefore, if such an expansion allowance part 54 is employ | adopted, the refractory brick 53 and the heat insulation brick 52 can be piled up closely.

Although the lining 5 of the combustion chamber furnace body 2 has been described above, the lining 5 of the heat storage chamber furnace body 3 is configured similarly.
As shown in FIG. 29, in the heat storage chamber furnace body 3, for example, the lining 5 shown in FIG. 25 is formed on the inner side of the iron skin 4, and the checker brick 31 is not spaced inside the innermost refractory brick 53. Stacked.

By the way, when installing the lining 5 described above, a scaffold is built inside the combustion chamber furnace body 2 or the heat storage chamber furnace body 3, or a gondola is suspended, and the iron skin 4 is placed at a predetermined height in the furnace. The castable 51 is sprayed inside. Then, the work which piles up the heat insulation brick 52 and the refractory brick 53 inside the castable 51 was performed (refer patent document 2 and patent document 3).
In general, the heat-insulating bricks 52 and the refractory bricks 53 are divided into layers of a height (about 1.2 m) that can be easily constructed by an operator, and the layers are stacked in sequence.

JP-A-8-269514 Japanese Examined Patent Publication No. 56-24007 JP 2009-115444 A

As described above, in the conventional installation of the lining 5, since the scaffold or the gondola is used for spraying the castable 51 to the inside of the iron skin 4, it is necessary to assemble these before the castable 51 is sprayed.
Further, since the scaffold or gondola used for spraying the castable 51 interferes with the heat insulating bricks 52 and the refractory bricks 53 stacked inside the castable 51, it is necessary to dismantle them prior to the stacking.
That is, between the construction of the castable 51 and the stacking work of the heat insulating brick 52 and the refractory brick 53, a process of installing and dismantling the work scaffold or gondola is necessary. An increase was inevitable.

An object of the present invention is to provide a method for constructing a hot blast furnace in which the lining of the furnace body can be performed easily and in a short period of time.

In the present invention, the furnace body has an iron skin and a lining formed inside the iron skin, and the lining is installed inside the castable and the castable inside the iron skin. A method for constructing a hot stove having a heat insulating brick and a refractory brick installed inside the heat insulating brick, wherein the heat insulating brick and the refractory brick are installed at an interval inside the iron skin. Thereafter, the castable is injected between the iron shell and the heat insulating brick, and the heat insulating brick generates a radially inward force of the furnace body by the head pressure from the castable from the heat insulating brick to the refractory brick. It is characterized in that the castable is solidified while preventing the thermal insulating brick from being displaced and divided.
At this time, as a procedure for the construction of the furnace, after installing the heat insulating brick from the iron side, the fire brick may be installed, or after installing the fire brick from the inner surface of the furnace, the heat insulating brick may be installed. The order is not limited, and castable is poured and solidified after the construction of these heat-insulating bricks and refractory bricks.

In the present invention, since the castable is not spraying, there is no need to install and disassemble a scaffold or gondola inside the iron skin, and the lining of the furnace body can be performed easily and in a short period of time.
Here, when the castable is injected between the iron skin and the heat insulating brick, the heat insulating brick receives a load or blow from the castable (force inward in the radial direction of the furnace body due to the head pressure of the castable). Alternatively, the blow can be borne from the insulating brick to the refractory brick. For this reason, for example, it is possible to prevent inconveniences such as displacement or division of the stacked heat-insulating bricks, which is a concern when receiving a load from the castable with only heat-insulating bricks.

In the present invention, the lining has an expansion margin portion between the heat insulation brick and the fireproof brick, between the heat insulation bricks, between the fire bricks, and in the expansion margin portion, It is desirable to interpose a spacer that has a predetermined strength at normal temperature and disappears at the furnace temperature during operation of the hot stove.
In such this invention, the expansion allowance part can accept | permit the thermal expansion of the refractory brick at the time of burning. On the other hand, if the expansion allowance portion is only a freely deformable space or a soft filler, it is not possible to obtain a load burden from the heat insulating brick to the refractory brick as an essential function of the present invention. However, since a spacer is interposed in the present invention, the load burden necessary for the present invention can be achieved.

That is, at normal temperature, the spacer has a predetermined strength, and this spacer enables load transmission from the heat insulating brick to the refractory brick. Therefore, when castable is injected between the iron skin and the insulating brick, even if the insulating brick receives a load or blow from the castable, the load or blow must be reliably borne from the insulating brick to the refractory brick. Can do.
Although not included in the present invention, it is also possible to pour castables without stacking refractory bricks by stacking only heat insulating brick layers. In this case, in order to suppress the displacement of the heat-insulating brick layer due to castable injection, a support such as a press plate and a beam is provided on the furnace inner surface side of the heat-insulating brick layer, or the one-time stacking height of the heat-insulating brick is kept low. Construction is possible by this method, but it is inefficient and costly.
On the other hand, since the spacer melts and disappears from the expansion margin as the furnace temperature rises after firing, the expansion margin can perform the intended function, and the thermal expansion of the refractory bricks Can be tolerated.
Therefore, in the spacer of the present invention, as the predetermined strength, it is only necessary to obtain a strength greater than the load that should be borne when casting castable, and it is desirable to design appropriately according to the hot stove to which the present invention is applied. .

In the present invention, the spacer is preferably a thermoplastic resin foam.
As the thermoplastic resin foam, for example, a polystyrene foam frequently used as a buffer material, that is, a polystyrene resin (PS) foam can be used, and a foam of other thermoplastic resin may be used. Other thermoplastic resins include LDPE (low density polyethylene resin), HDPE (high density polyethylene resin), EVA (polyethylene vinyl alcohol resin), PP (polypropylene resin), PVC (polyvinyl chloride resin), PE / PS blends Resin, PMMA (acrylic resin), ABS (acrylonitrile butadiene styrene copolymer resin) and the like can be used.
In the present invention, the spacer is made of a thermoplastic resin foam, so that the temperature characteristics as the spacer of the present invention (strength at normal temperature and softening and melting with increasing temperature) can be obtained. Adjustment and shape processing are easy and can be ensured at low cost.
In addition, as a spacer, what molded the thermoplastic resin foam mentioned above in the shape of a block can be utilized, for example. Further, it may be a lattice structure of a thermoplastic resin, a honeycomb structure, or the like. Furthermore, the material of the spacer is not limited to a synthetic resin material having thermoplasticity, and may be paper (such as cardboard).

In the present invention, it is desirable that a filler that is soft or indeterminate at room temperature is interposed in the expansion margin portion together with the spacer.
In such this invention, after a spacer lose | disappears in an expansion allowance part, it will be in the state with which the expansion allowance part was filled. And when the expansion allowance shrinks with the thermal expansion of the refractory brick, the filler can follow this deformation, filling the gap of the refractory brick while allowing the thermal expansion of the refractory brick, and the intrusion of hot air Can be prevented.
As such a filler, a ceramic fiber having heat resistance is preferable. The filler may be packed in a hollow portion where there is no spacer of the expansion margin, or may be packed in a cavity or a recess formed in the spacer, or when the spacer is a synthetic resin molded product, It may be melted.

In the present invention, the hot stove is preferably provided with checker bricks inside the lining, and the castable injection is preferably performed during or after the checker bricks are installed.
In such this invention, after installation of a heat insulation brick and a refractory brick, castable injection | pouring is performed during the installation operation | work of a checker brick, A process can be overlapped and the whole construction period can be shortened. Or it can also bear the load at the time of injection | pouring of a castable with a checker brick by performing after installation of a checker brick.

In the present invention, it is desirable that the furnace body is divided into a plurality of sections arranged in the height direction, and the castable injection is performed for each section.
In the present invention, for example, when the heat-insulating bricks and the refractory bricks are stacked in sections of 1.2 m, the sections may be set according to this. In this way, when the stacked sections of the heat insulating bricks and the refractory bricks are matched with the castable injection height sections, the heat insulating bricks and the refractory bricks may be preceded and the castable injection may be performed. Brick stacking and castable pouring may be performed simultaneously.
Furthermore, if the castable injection height is about 1.2 m, it is easy to visually check foreign matters such as road tools entering the castable injection portion from above and the castability fluidity.

In the present invention, it is preferable that the heat insulating bricks are installed in a plurality of layers in the thickness direction of the lining, and the horizontal joints in the circumferential direction of the heat insulating bricks of each layer are shifted from each other.
In the present invention, since the joints of the respective layers of the heat insulating brick are displaced, even if a load or blow caused by castable injection is applied, the load is borne by the displacement of each joint, thereby preventing the heat insulating brick from being displaced or divided. It is effective.

In the present invention, the castable desirably has a free flow value of 200 mm or more and 300 mm or less.
In such this invention, since the free flow value is 200 mm or more, the fluidity of the castable is ensured, and even when it is poured into the gap between the iron skin and the heat insulating brick, reliable filling is obtained to every corner. Further, by setting the free flow value to 300 mm or less, it is possible to prevent quality defects or clogging of hoses due to separation of castable components during injection.

In this invention, since the castable is not spraying construction, it is not necessary to install and disassemble the scaffold or gondola inside the iron skin, and the lining of the furnace body can be performed easily and in a short period of time.

The longitudinal cross-sectional view which shows the lining of 1st Embodiment of this invention. The longitudinal cross-sectional view which shows the installation process of the 1st layer of the heat insulation brick in the said 1st Embodiment. The longitudinal cross-sectional view which shows the installation process of the 2nd layer of the heat insulation brick in the said 1st Embodiment. The longitudinal cross-sectional view which shows the installation process of the inclusion in the said 1st Embodiment. The longitudinal cross-sectional view which shows the installation process of the firebrick in the said 1st Embodiment. The longitudinal cross-sectional view which shows the injection | pouring process of the castable in the said 1st Embodiment. The longitudinal cross-sectional view which shows the state at the time of the operation | movement of the lining of the said 1st Embodiment. The longitudinal cross-sectional view which shows the construction order in case a castable is inject | poured for every hierarchy in the said 1st Embodiment. The longitudinal cross-sectional view which shows the construction order in the case of inject | pouring a castable collectively in the several hierarchy in the said 1st Embodiment. The longitudinal cross-sectional view which shows the lining of 2nd Embodiment of this invention. The longitudinal cross-sectional view which shows the lining of 3rd Embodiment of this invention. The plane sectional view showing the lining of the 3rd embodiment. The longitudinal cross-sectional view which shows the lining of 4th Embodiment of this invention. The longitudinal cross-sectional view which shows the lining of 5th Embodiment of this invention. The longitudinal cross-sectional view which shows the lining of 6th Embodiment of this invention. The plane sectional view showing the lining of the 6th embodiment. The perspective view which shows an example of the spacer which can be utilized by this invention. The perspective view which shows an example of the spacer which can be utilized by this invention. The perspective view which shows an example of the spacer which can be utilized by this invention. The perspective view which shows an example of the spacer which can be utilized by this invention. The perspective view which shows an example of the spacer which can be utilized by this invention. The perspective view which shows an example of the spacer which can be utilized by this invention. The perspective view which shows an example of the spacer which can be utilized by this invention. The longitudinal cross-sectional view which shows the conventional external combustion type hot stove. The longitudinal cross-sectional view which shows the lining of the conventional combustion chamber. The longitudinal cross-sectional view which shows the operating state of the lining of the conventional combustion chamber. The longitudinal cross-sectional view which shows the different form of the lining of the conventional combustion chamber. The cross-sectional view which shows the different form of the lining of the conventional combustion chamber. The longitudinal cross-sectional view which shows the lining of the conventional heat storage chamber. The plane sectional view showing the lining of a 7th embodiment of the present invention. The graph which shows selection of the polystyrene foam used as a spacer by this invention. The longitudinal cross-sectional view which shows construction of Example 1 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
In the present embodiment, the furnace is built on the combustion chamber furnace body 2 (see FIG. 25) of the hot stove 1 (see FIG. 24).
In the present embodiment, a unique structure and construction procedure based on the present invention is adopted particularly for the lining 5 installed in the furnace body (combustion chamber furnace body 2).

In FIG. 1, the lining 5 includes a castable 51 formed on the inner surface of the iron skin 4, two layers of heat insulating bricks 52 stacked on the inside thereof, and one layer of refractory bricks 53 stacked on the inside thereof. Further, an expansion margin 54 is provided between the layer of the heat insulating brick 52 and the layer of the refractory brick 53.
These castable 51, heat insulating brick 52, refractory brick 53 and expansion allowance 54 are the same as those of the lining 5 shown in FIG.
However, in this embodiment, the injection procedure of the castable 51 and the configuration of the expansion margin portion 54 are unique.

The castable 51 of the present embodiment is injected into the gap between the heat-insulating brick 52 and the iron skin 4 that have been previously installed, and is solidified. In other words, there is no need to repeat the installation of the scaffolding and the spraying work at a plurality of heights, as in the construction of the existing castable 51.
The castable 51 of the present embodiment has the same basic components as the existing castable. However, in order to reliably inject between the heat insulating brick 52 and the iron skin 4 to every corner without using a vibrator, The free flow value indicating the fluidity is adjusted to be 200 to 300 mm.

In the construction of the castable 51, the moisture of the castable 51 is absorbed by the heat-insulating bricks constructed on the inner surface of the castable 51, and the fluidity is lowered. In order to prevent water absorption to such a heat insulating brick, it is also possible to perform a water-repellent treatment in advance on the contact surface of the heat insulating brick. However, such processing increases costs. In order to enable construction without such pretreatment, it is effective to adjust the free flow value to be 200 mm to 300 mm.

Here, even if a free flow value is 200 mm or less, castable construction is possible by using a vibrator. However, since the use of a vibrator may cause joint breakage or misalignment of the heat insulating brick due to vibration, it is desirable not to use the vibrator.
In the present embodiment, as described above, the water repellent treatment is not performed on the surface of the heat insulating brick, and the castable is directly applied to the surface of the heat insulating brick so that the castable and the heat insulating brick are firmly bonded to each other. There is no gap, and it is possible to prevent the back air that the hot air in the hot stove invades into the iron skin and the castable surface.

In addition, in order to enable injection of the castable 51 described above, the expansion allowance portion 54 is configured by interposing a spacer 55 and a filler 56 in the gap between the heat insulating brick 52 and the refractory brick 53. The load of the head pressure due to the injection can be transmitted from the heat insulating brick 52 to the refractory brick 53.

The spacer 55 is a long block that continuously extends in the horizontal direction through the gap between the heat insulating brick 52 and the refractory brick 53.
The spacer 55 is rectangular in cross section, the furnace body outer surface of the spacer 55 is in intimate contact with the inner surface of the heat insulating brick 52, and the furnace body side surface of the spacer 55 is in intimate contact with the outer surface of the refractory brick 53. The furnace body radial direction of the spacer 55 is set to be equal to the distance between the heat insulating brick 52 and the refractory brick 53 so as to ensure close contact with the heat insulating brick 52 and the refractory brick 53.

The spacer 55 is a block formed of, for example, a foamed polystyrene resin, and is hard, that is, has a certain degree of rigidity, among the foamed polystyrene resin blocks so that the load from the heat insulating brick 52 can be transmitted to the fireproof brick 53. It is supposed to be.
The following procedure is adopted when selecting the rigidity (compression elastic modulus) of the foamed polystyrene.

FIG. 31 shows the relationship between the compression elastic modulus and the spacer insertion ratio.
Here, the insertion ratio of the expanded polystyrene is 100% when all the expansion allowance is expanded polystyrene as shown in FIG. 12, and 10% when the expanded polystyrene of 46 mm is inserted every 460 mm in the height direction as shown in FIG. .
That is, as shown by a curve P1 in FIG. 31, when a castable is installed every 2 m in the height direction and 46 mm of foamed polystyrene is inserted every 460 mm in height, the compression elastic modulus required is 80 kg / cm ² (785 N / Cm ² ) or more. Further, as shown by the curve P2, when the castable is installed every 1 m in the height direction and the fired polystyrene of 46 mm is inserted every 460 mm, the compression elastic modulus required is 50 kg / cm ² (490 N / cm ² ) Or more.
As described above, it is necessary to select a material for the expanded polystyrene resin spacer 55 so that the spacer itself is not crushed according to the insertion ratio and the castable injection height.

When the furnace body is cylindrical, the gap between the heat insulating brick 52 and the refractory brick 53 where the spacer 55 is arranged is curved in an arc shape in the horizontal direction. As described above, since the spacer 55 is long but hard, construction (for example, temporarily fixing to the inner surface of the heat insulating brick 52) or the like may be difficult as it is. For this reason, in the present embodiment, it is desirable to perform, for example, the following arc shape correspondence.

As shown in FIG. 17, a laminate of a plurality of thin plates 55A molded with a polystyrene foam resin is used. By laminating and integrating the thin plates 55A that have been curved in advance, it is possible to obtain a spacer 55 that has been curved in advance in an arc shape.
As shown in FIG. 18, a base material 55 </ b> B having a rectangular cross-sectional shape is formed of a polystyrene foam resin, and linearly extending, and a plurality of notches 55 </ b> C having a predetermined width are formed on one surface thereof. When used as the spacer 55, the base material 55B can be easily bent by the amount of the cut 55C cut by bending the cut 55C toward the inside. In addition, it can also be curved with the cut 55C side as the outside.
As shown in FIG. 19, a base material 55B similar to that of FIG. 18 is molded, and this is cut with a cutting surface inclined with respect to the longitudinal direction, whereby a large number of small pieces 55D whose planar shape is an isosceles trapezoid. Form. By arranging these small pieces 55D so that the lower base of the isosceles trapezoid is on the outer side and the upper base is on the inner side, an arcuate spacer 55 can be formed as a whole.

In the expansion margin portion 54, the spacer 55 described above is intermittently arranged at a plurality of heights, and in the gap between the heat insulating brick 52 and the refractory brick 53, a hollow portion is left between the vertically adjacent spacers 55. . A hollow portion between the spacers 55 is filled with a filler 56.
The filler 56 is a heat-resistant ceramic fiber or the like, and can be arbitrarily deformed in shape and thickness by an external force.
The filler 56 is installed in an amount sufficient to fill a gap remaining between the heat insulating brick 52 and the refractory brick 53 after the blast furnace 53 is operated and the refractory brick 53 is thermally expanded.

In the expansion margin 54, the ratio of the area where the spacer 55 is in intimate contact with the surface of the heat insulating brick 52 or the refractory brick 53 (with respect to the total of the area of the spacer 55 in close contact with the area where the filler 56 is accommodated). The ratio is, for example, 10 to 50%.
When this ratio is reduced, the required amount of the spacer 55 can be reduced, and the material cost can be reduced. However, since the load transmitted from the heat insulating brick 52 to the refractory brick 53 is concentrated in a small area, it is necessary to increase the rigidity of the material of the spacer 55.
When this ratio is increased, the load from the heat insulating brick 52 to the refractory brick 53 can be transmitted over a wide area, and the rigidity of the material of the spacer 55 can be reduced.

As for the ratio of the spacer 55, the expansion allowance portion 54 may be entirely composed of the spacer 55, and the ratio may be 100% (see the fourth embodiment to be described later). Also good.

[Construction procedure of the first embodiment]
The construction procedure of the lining 5 in this embodiment is as follows.
First, as shown in FIG. 2, a first-layer heat-insulating brick 52 is constructed at a predetermined interval inside the iron skin 4 of the combustion chamber furnace body 2.
Next, as shown in FIG. 3, the second-layer heat-insulating brick 52 is constructed in close contact with the inside of the first-layer heat-insulating brick 52. At this time, the joints of the second-layer insulating bricks 52 are shifted from each other in the height direction with respect to the lateral joints of the first-layer insulating bricks 52.
Further, an adhesive mortar or the like is applied between the heat insulating bricks 52 of each layer and between the first layer and the second layer, and is fixed to each other.

Subsequently, as shown in FIG. 4, a spacer 55 extending in the horizontal direction is installed at a predetermined height position on the inner surface of the second-layer heat-insulating brick 52. At the time of installation, a double-sided adhesive tape or the like is used, and the spacer 55 is temporarily fixed to the inner side surface of the heat insulating brick 52.
Further, a filler 56 is packed between the spacers 55 adjacent in the vertical direction. The filler 56 may be installed in a state of being packed in a bag or the like, and is preferably temporarily fixed to the inner side surface of the upper spacer 55 or the heat insulating brick 52 with a double-sided adhesive tape or the like.

Next, as shown in FIG. 5, the refractory brick 53 is constructed in a close state inside the spacer 55. At this time, the spacer 55 is sandwiched between the heat insulating brick 52 and the refractory brick 53 and a compression force is applied so that the spacer 55 is in close contact with the heat insulating brick 52 and the refractory brick 53.
Subsequently, as shown in FIG. 6, castable 51 is injected into the gap between the inner surface of the iron skin 4 and the outer surface of the first-layer heat-insulating brick 52 and solidified.
The castable 51 may be poured from above or may be gradually poured from below using an injection pipe 41 penetrating the iron skin 4 as shown in FIG.

The lining 5 including the castable 51, the heat insulating brick 52, the refractory brick 53, and the expansion margin portion 54 is formed by the above procedure.
When the hot stove is in operation, as shown in FIG. 7, the spacer 55 is melted by the heat in the furnace and disappears from the expansion margin 54, and the filler 56 contracts due to expansion of the refractory brick. It will be in the state with which the part 54 was filled.

[Effects of First Embodiment]
According to this embodiment, the following effects can be achieved.
In this embodiment, since the castable 51 is not spraying work, a complicated work of installing a scaffold or a gondola inside the iron skin 4 and disassembling before installing the heat insulating brick 52 for spraying the castable 51. Can be omitted. Thereby, construction of the lining 5 of the furnace body can be performed easily and in a short time.

In the present embodiment, in the two-layer heat insulating brick 52, the horizontal joint of the first layer and the horizontal joint of the second layer are arranged so as to be shifted from each other, so that the load due to the casting of the castable 51 (the furnace body by the head pressure of the castable 51) Even if the first-layer heat-insulating brick 52 tries to displace to the inside of the furnace due to the inward force in the radial direction of the above-mentioned, the displacement is suppressed at the intermediate portion of the second-layer heat-insulating brick 52.
In addition, since the insulating bricks 52 of each layer and between the first layer and the second layer of the insulating brick 52 are fixed to each other with an adhesive mortar or the like, the load due to the casting of the castable 51 is applied. Can be dispersed.
Therefore, the heat-insulating brick 52 itself can also increase the strength against the load or blow caused by the casting of the castable 51.

In the present embodiment, the lining 5 has an expansion allowance 54 between the heat insulating brick 52 and the refractory brick 53, and the expansion allowance 54 has a predetermined strength at room temperature and is a furnace in operation of the hot stove. A spacer 55 that disappears at the internal temperature is interposed.
The spacer 55 is interposed between the heat-insulating brick 52 and the refractory brick 53 in a state of having a predetermined strength before the operation as a building furnace, that is, as a hot stove, and the load applied to the heat-insulating brick 52 when the castable 51 is injected. (Force inward in the radial direction of the furnace body due to the head pressure of the castable 51) can be transmitted to the refractory brick 53.

That is, when the castable 51 is injected between the iron skin 4 and the heat insulating brick 52, the heat insulating brick 52 receives a load or blow (force inward in the radial direction of the furnace body) due to the head pressure from the castable 51. However, this load or blow can be transmitted from the heat-insulating brick 52 to the refractory brick 53 via the spacer 55 installed in the expansion margin 54. Therefore, it is possible to reliably bear a portion having a sufficiently large mass from the heat insulating brick 52 to the refractory brick 53.
For this reason, for example, when there is no spacer 55 and refractory brick 53, that is, when the load from the castable 51 is received only by the heat insulating brick 52, the accumulated heat insulating brick 52 is worried about deviation or splitting. Inconvenience due to the injection can be prevented in advance.

On the other hand, since the spacer 55 is made of, for example, styrene foam resin, it disappears due to the heat in the furnace when the hot blast furnace is operated after firing, and allows thermal expansion of the refractory brick 53 (displacement in the radial direction of the furnace body). I can.
That is, after the hot stove is fired, the spacer 55 melts and disappears from the expansion margin 54 as the furnace temperature rises. For this reason, the expansion allowance portion 54 can perform the intended function, and thermal expansion of the refractory brick 53 can be allowed.

In the present embodiment, by using a polystyrene resin foam (foamed polystyrene) as the spacer 55, temperature characteristics as the spacer 55 (strength at normal temperature, softening and melting as the temperature rises) are obtained, and strength of the spacer 55 is increased. Adjustment and shape processing are easy and can be ensured at low cost.

In the present embodiment, the expansion margin portion 54 is provided with a spacer 56 and a filler 56 that is soft or indefinite at room temperature. For this reason, after the spacer 55 disappears in the expansion allowance portion 54, the filler 56 is filled in the expansion allowance portion 54. And when the clearance gap of the expansion allowance part 54 shrinks with the thermal expansion of the refractory brick 53, the filler 56 can follow this deformation | transformation, and while allowing the thermal expansion of the refractory brick 53, the expansion allowance part 54 is allowed. It is possible to fill the gap and prevent hot air from entering.
In the present embodiment, since the ceramic fiber having heat resistance is used as the filler 56, it is possible to reliably follow the thermal expansion of the refractory brick 53 and to minimize deterioration due to heat during operation.

[Modification of Castable Injection Procedure of First Embodiment]
In the first embodiment described above, the castable 51 is injected only after the heat insulating brick 52, the spacer 55 and the filler 56 of the expansion margin 54, and the refractory brick 53 are installed. However, in implementation, the casting of the castable 51 may be performed for each layer having a predetermined height, or may be performed collectively for a plurality of layers having a predetermined height.
Here, the level of the predetermined height is a height of about 1.2 m suitable for the worker to construct the heat insulating brick 52, the spacer 55 and the filler 56 of the expansion margin 54, and the refractory brick 53.

FIG. 8 shows a procedure for injecting the castable 51 for each layer.
In FIG. 8, the combustion chamber furnace body 2 has a plurality of levels (including levels C1 to C3). In these layers C1 to C3, the lining 5 is applied to the inside of the iron skin 4 in the order indicated by reference numerals 1 to 15.

First, in the layer C1, the heat insulating bricks 52 are installed in two layers with a predetermined interval inside the iron skin 4 (reference numerals 1 and 2), and the expansion margin part 54 (spacer 55 and filler 56) is installed inside thereof. (Reference numeral 3), and a refractory brick 53 is installed inside (reference numeral 4). And castable 51 is inject | poured between the iron skin 4 and the heat insulation brick 52 (code | symbol 5). After that, a framework scaffolding (such as a single pipe assembly for 1.2 meters or a bittery scaffolding) will be temporarily installed.
Subsequently, in the layer C2, similarly, the heat insulating brick 52 (reference numeral 6 and reference numeral 7), the expansion margin part 54 (reference numeral 8) and the refractory brick 53 (reference numeral 9) are installed, and the castable 51 is injected (reference numeral 10). . After that, a similar framework scaffold will be set up temporarily.
Further, in the layer C3, similarly, the heat insulating brick 52 (reference numeral 11 and reference numeral 12), the expansion margin part 54 (reference numeral 13) and the refractory brick 53 (reference numeral 14) are installed, and the castable 51 is injected (reference numeral 15).

In each of the layers C1 to C3, the castable 51 may be injected from above by placing an operator on the upper surface of the heat insulating brick 52 of each layer and penetrating the iron skin 4 in the lower part of each layer C1 to C3. An injection tube 41 may be provided for injection.
By performing such injection for each layer, the injection height of the castable 51 can be reduced, so that the operator can visually check the contamination of the castable injection part such as road tools and the fluidity of the castable, Reliable filling can be performed.

FIG. 9 shows a procedure in a case where casting of the castable 51 is performed collectively for a plurality of hierarchies.
In FIG. 9, the combustion chamber furnace body 2 has a plurality of levels (including levels C1 to C4). In these layers C1 to C4, the lining 5 is applied to the inside of the iron shell 4 in the order indicated by reference numerals 1 to 17.

First, in the layer C1, the heat insulating bricks 52 are installed in two layers with a predetermined interval inside the iron skin 4 (reference numerals 1 and 2), and the expansion margin part 54 (spacer 55 and filler 56) is installed inside thereof. (Reference numeral 3), and a refractory brick 53 is installed inside (reference numeral 4). After that, a framework scaffolding (such as a single pipe assembly for 1.2 meters or a bittery scaffolding) will be temporarily installed.
Next, in the level C2, similarly, the heat insulating brick 52 (reference numeral 5 and reference numeral 6), the expansion margin 54 (reference numeral 7), and the refractory brick 53 (reference numeral 8) are installed.
In this state, the castable 51 is injected into two layers of the layer C1 and the layer C2 between the iron skin 4 and the heat insulating brick 52 (reference numeral 9). After that, a similar framework scaffold will be set up temporarily.

Subsequently, in the layer C3, the heat insulating brick 52 (reference numeral 10 and reference numeral 11), the expansion margin 54 (reference numeral 12), and the refractory brick 53 (reference numeral 13) are similarly installed. After that, a similar framework scaffold will be set up temporarily.
Furthermore, in the hierarchy C4, the heat insulation brick 52 (code | symbol 14 and code | symbol 15), the expansion allowance part 54 (code | symbol 16), and the refractory brick 53 (code | symbol 17) are installed similarly.
In this state, the castable 51 is injected into the two layers of the layer C3 and the layer C4 between the iron skin 4 and the heat insulating brick 52 (reference numeral 18).

The castable 51 may be injected into the layers C1 and C2 and the layers C3 and C4 by an operator on the upper surfaces of the heat insulating bricks 52 of the upper layers C2 and C4. You may inject | pour by providing the injection pipe 41 which penetrates the iron skin 4 in the lower part of C1, C3.
By performing such injection for each layer, the castable 51 can be injected into a plurality of layers at a time, so the number of injection operations for the castable 51 can be reduced and the work efficiency can be improved. .

[Deformation of the spacer 55 of the first embodiment]
In the first embodiment described above, the spacer 55 is intermittently installed at every predetermined height of the expansion allowance portion 54 and the space 56 is filled with the filler 56. However, the volume of the spacer 55 may be expanded, and a concave portion or the like may be formed on the surface thereof, and the filler 56 may be accommodated therein.

In FIG. 20, the spacer 55 has a rectangular parallelepiped main body, a concave portion 55E is formed on the surface of the main body, and the concave portion 55E is filled with a filler 56. When such a spacer 55 is used, the operation of installing the spacer 55 is performed up to the installation of the filler 56 at the same time, so that the work process can be simplified and the efficiency can be improved.
In FIG. 21, the spacer 55 has an E-shaped cross section and has a main body continuous in the longitudinal direction, and a concave groove 55F continuous on one surface is filled with a filler 56. Even when such a spacer 55 is used, the installation of the filler 55 is performed at the same time as the installation of the spacer 55, and the work process can be simplified to improve the efficiency.

The spacer 55 in which such a filler 56 can be accommodated is not limited to the block-shaped main body in which the concave portion 55E or the concave groove 55F is formed, and the main body of the spacer 55 may have a shape other than the block.
In FIG. 22, the main body of the spacer 55 has a lattice shape in which shafts 55G of a thermoplastic resin having a predetermined rigidity are vertically and horizontally assembled, and a filler 56 is held in the inner space of the lattice.
In FIG. 23, the main body of the spacer 55 is composed of a thermoplastic resin honeycomb structure 55H having a predetermined rigidity, and a filler 56 is held in the inner space.

In such a spacer 55 shown in FIG. 22 or FIG. 23, the shaft member 55G or the honeycomb structure 55H maintains a predetermined rigidity before the hot stove is fired. Therefore, the load of the heat insulating brick 52 shown in FIG. The function of transmitting to 53 can be ensured.
On the other hand, after the hot air furnace is fired, the shaft material 55G or the honeycomb structure 55H is softened or melted by the heat in the furnace, thereby allowing thermal expansion of the refractory bricks 53.
Then, the filler 56 held in the lattice of the shaft member 55G or the honeycomb structure 55H remains as the expansion margin portion 54, and the expansion margin portion 54 (intermittent spacer 55) of the first embodiment described above thereby remains. Further, the same effect as that of the filler 56) can be obtained.

[Second Embodiment]
In the present embodiment, the heat storage chamber furnace body 3 (see FIG. 10) constituting the hot stove 1 (see FIG. 24) is constructed.
In FIG. 10, a heat storage chamber furnace body 3 is obtained by stacking checker bricks 31 inside the same structure as the combustion chamber furnace body 2 (see FIG. 1) described in the first embodiment. Therefore, the description of the same structure as the combustion chamber furnace body 2 described above is omitted.

In addition, as the furnace building procedure of the present embodiment, the installation of the checker brick 31 is added inside the refractory brick 53 after the procedure described in the first embodiment (see FIGS. 2 to 7). . Therefore, the description of the procedure similar to that of the combustion chamber furnace body 2 described above is also omitted.
According to this embodiment, the same effect as that of the first embodiment described above can be obtained also in the heat storage chamber furnace body 3.

[Third Embodiment]
In the present embodiment, a furnace having a different structure (see FIGS. 11 and 12) of the combustion chamber furnace body 2 constituting the hot stove 1 (see FIG. 24) is performed.
In the present embodiment, a unique structure and construction procedure based on the present invention is adopted particularly for the lining 5 installed in the furnace body (combustion chamber furnace body 2).

11 and 12, the lining 5 includes a castable 51 formed on the inner surface of the iron skin 4, a heat insulating brick 52 stacked on the inside thereof, and a refractory brick 53 stacked on the inside thereof. Furthermore, it has the expansion allowance part 54 continuous in a radial direction between the refractory bricks 53 arranged in the circumferential direction of the furnace body.
The castable 51, the heat insulating brick 52, the refractory brick 53, and the expansion allowance 54 are the same as those of the lining 5 shown in FIGS. 27 and 28 described above.
However, in this embodiment, the injection procedure of the castable 51 and the configuration of the expansion margin portion 54 are unique.

The castable 51 of the present embodiment is injected into the gap between the heat-insulating brick 52 and the iron skin 4 previously installed and solidified, as in the first embodiment described above. For this purpose, the castable 51 is adjusted so that the free flow value is 200 to 300 mm.
In addition, in order to enable the injection of the castable 51 described above, the expansion allowance portion 54 is configured by interposing a spacer 55 and a filler 56 in the gap between the heat insulating brick 52 and the refractory brick 53. Thereby, when the load from the heat insulating brick 52 is received by the fireproof brick 53, the expansion allowance portion 54 is not narrowed, and the heat insulating brick 52 can be reliably supported.

The spacer 55 is a bar-like block having a rectangular cross section and formed of a rigid foam polystyrene similar to that of the first embodiment. The spacer 55 is installed in the gap between the refractory bricks 53 along the horizontal and radial directions.
The spacer 55 is installed in a state of being pressed by the fire bricks 53 on both sides, and is thereby in close contact with the surfaces of the fire bricks 53 on both sides.

In the expansion margin portion 54, the spacer 55 described above is intermittently arranged at a plurality of heights, and in the gap between the refractory bricks 53, a hollow portion is left between the vertically adjacent spacers 55. A hollow portion between the spacers 55 is filled with a filler 56.
The filler 56 is a heat-resistant ceramic fiber or the like, and can be arbitrarily deformed in shape and thickness by an external force.
The filler 56 is installed in such an amount that the gap remaining in the heat insulating brick 52 and the refractory brick 53 can be filled after the hot stove is operated and the refractory brick 53 is thermally expanded.

The construction procedure of the lining 5 in this embodiment is as follows.
First, two layers of heat-insulating bricks 52 are installed inside the iron skin 4 with a space therebetween, and the refractory bricks 53 are installed inside thereof. When stacking refractory bricks 53, after stacking one refractory brick 53, an expansion margin 54 (spacer 55 and filler 56) is installed on the side surface, and the adjacent refractory bricks 53 are stacked so as to sandwich this portion. go.
When these steps are repeated to install the heat insulating brick 52, the refractory brick 53, and the expansion allowance 54, the castable 51 is poured into the gap between the iron shell 4 and the heat insulating brick 52. About the injection | pouring of the castable 51, it is the same as that of 1st Embodiment mentioned above.

Also according to this embodiment, the same effect as that of the first embodiment described above can be obtained.
Note that the castable 51 can be injected for each layer or a plurality of layers at once as in the first embodiment described above.

[Fourth Embodiment]
The present embodiment has substantially the same configuration as that of the first embodiment described above, but the configuration of the expansion allowance portion 54 is different.
In FIG. 13, the combustion chamber furnace body 2 of the present embodiment has a lining 5 inside the iron skin 4 as in the first embodiment, and the lining 5 includes a castable 51, a heat insulating brick 52, a refractory brick 53 and an expansion. A surrogate part 54 is provided.
Details of elements other than the expansion allowance portion 54 in the lining 5 of the present embodiment and the installation procedure of the lining 5 are the same as those in the first embodiment described above, and thus redundant description is omitted. The difference regarding 54 will be described.

The expansion allowance portion 54 of the first embodiment described above is composed of spacers 55 arranged at a predetermined interval as shown in FIG. 1 and fillers 56 filled therebetween. On the other hand, in the present embodiment, as shown in FIG. That is, the ratio of the spacer 55 in the expansion margin 54 is 100%.
As the spacer 57 of the present embodiment, a material obtained by mixing the hard foamed polystyrene resin similar to the spacer 55 of the first embodiment described above with the ceramic fiber used as the filler 56 in the first embodiment described above can be used. . However, the same material (not including ceramic fiber) as the spacer 55 of the first embodiment described above may be used.

Also according to this embodiment, the same effect as that of the first embodiment described above can be obtained.
That is, since the castable 51 is an injection type, a scaffold for it can be omitted. Further, the spacer 57 transmits the load from the heat insulating brick 52 to the refractory brick 53, and can reliably receive the load or blow due to the head pressure accompanying the injection of the castable 51.
On the other hand, the spacer 57 is melted by the heat in the furnace after the hot stove is turned on and disappears. However, the ceramic fiber mixed in the spacer 57 serves as an expansion margin 54 between the heat insulating brick 52 and the refractory brick 53. It remains and can replace the function of the filler 56 (see FIG. 1) of the first embodiment, and the construction is also easier than the installation of the expansion margin portion 54 of the first embodiment.

[Fifth Embodiment]
In this embodiment, the heat storage chamber furnace body 3 (see FIG. 14) constituting the hot stove 1 (see FIG. 24) is constructed.
In FIG. 14, the heat storage chamber furnace body 3 has a checker brick 31 inside the same structure as that of the combustion chamber furnace body 2 (see FIG. 1) described in the first embodiment, as in the second embodiment described above. Are stacked. Therefore, the description which overlaps about the structure and construction procedure similar to 2nd Embodiment mentioned above is abbreviate | omitted.

In the second embodiment described above, as the expansion allowance portion 54, the spacer 55 arranged intermittently as in the first embodiment and the filler 56 filled therebetween are used.
On the other hand, in the present embodiment, as in the fourth embodiment described above, the spacers 57 mixed with ceramic fibers are installed at a ratio of 100% as the expansion margin 54.
According to this embodiment, the same effect as that of the first embodiment described above can be obtained in the heat storage chamber furnace body 3 as well.

[Sixth Embodiment]
In the present embodiment, a furnace having a different structure (see FIGS. 15 and 16) of the combustion chamber furnace body 2 constituting the hot stove 1 (see FIG. 24) is constructed.
15 and 16, the lining 5 has an expansion margin portion 54 that is continuous in the radial direction between the refractory bricks 53 arranged in the circumferential direction of the furnace body, as in the third embodiment described above.

In the above-described third embodiment, as the expansion allowance portion 54, the spacer 55 that is intermittently disposed as in the first embodiment and the filler 56 that is filled therebetween are used.
On the other hand, in the present embodiment, as in the fourth embodiment described above, the spacers 57 mixed with ceramic fibers are installed at a ratio of 100% as the expansion margin 54.
According to the present embodiment as described above, the same effect as that of the first embodiment described above can be obtained also in the lining 5 having the expansion margin portion 54 that is continuous in the radial direction.

[Seventh Embodiment]
In the present embodiment, a furnace having a different structure (see FIG. 30) of the combustion chamber furnace body 2 constituting the hot stove 1 (see FIG. 24) described above is constructed.
In the fourth embodiment (see FIG. 13) described above, the expansion margin portion 54 is formed between the heat insulating brick 52 and the refractory brick 53, whereas in this embodiment, the expansion space 54 expands between two layers of the heat insulating brick 52. It was set as the structure which has arrange | positioned the surrogate part 54. FIG. In addition, as the expansion allowance portion 54, the entire expansion allowance portion 54 is configured by a spacer 57 as in the fourth embodiment described above. That is, the ratio of the spacer 55 in the expansion margin 54 is 100%.

As a construction procedure of this embodiment, first, the fire bricks 53 are stacked in two stages (reference numerals 1 and 2), and the heat insulating brick 52 is stacked in one stage (reference numeral 3) so as to be pressed against the fire bricks 53, and then the expansion allowance. A spacer 57 (reference numeral 4) as the portion 54 is installed, and the heat insulating bricks 52 (reference numeral 5) are stacked in one stage so as to be pressed against the spacer 57. After that, the fire bricks 53 are similarly stacked in two stages (symbols 6 and 7), and the heat insulating bricks 52 are stacked in one stage (symbol 8) so as to be pressed against them, and then a spacer 57 (symbol 9) is installed. The heat insulating brick 52 (reference numeral 10) is stacked so as to be pressed. Then, castable (symbol 11) is injected.
In this embodiment, since the heat insulating brick 52 is pressed against the refractory brick 53 or the spacer 57 by being stacked from the inner refractory brick 53, the work efficiency when the heat insulating brick 52 is stacked is improved.

[Modification]
Note that the present invention is not limited to the above-described embodiments, and modifications and the like within a scope in which the object of the present invention can be achieved are included in the present invention.
The application object of the present invention is not limited to the combustion chamber furnace body 2 and the heat storage chamber furnace body 3 of the hot air furnace 1 (see FIG. 24), but may be other types of hot air furnaces.
For example, in the case of an internal combustion type hot stove, the present invention can be applied to a furnace wall of a combustion chamber section and a furnace wall of a heat storage chamber section of the same furnace body.

In each embodiment, the two-layer insulating brick 52 in the lining 5 may be one layer or three or more layers, and the one-layer refractory brick 53 may be two or more layers.
As these heat-insulating bricks 52 and refractory bricks 53, existing ones can be used as appropriate.
The castable 51 is required to have a free flow value indicating the fluidity of 200 to 300 mm because of injection, but these may be realized by adjusting the composition, and the composition and the like are existing. May be used as appropriate.

The spacer 55 can be used in various forms as described above, and it is desirable to adjust the material characteristics according to the form to be used and the conditions, dimensions, arrangement, etc. in the form. In particular, it is necessary to be able to adjust the rigidity of the spacer 55 so as to be a predetermined value (stiff enough to transmit a load when the castable 51 is injected).
The material of the spacer 55 is not limited to a synthetic resin material such as the above-mentioned rigid foamed polystyrene resin or other thermoplastic resin, but may be paper (such as cardboard).

The expansion margin part 54 having the spacer 55 is not limited to between the heat insulating brick 52 and the refractory brick 53 (such as the first embodiment described above) or between the refractory bricks 53 (such as the third embodiment described above). It may be between the insulating bricks 52 of the layer.
In short, it is sufficient that the expansion allowance 54 is allowed to allow thermal expansion of the refractory brick 53, and the spacer 55 may be installed so as to prevent the expansion allowance function of the expansion allowance 54 at a stage before firing.

[Example 1]
In the construction of the external combustion type hot stove at the steelworks, the construction of the straight body of the regenerative furnace was carried out in the second embodiment described above (in which the checker brick 31 was added inside the first embodiment).
Details and construction procedures of each part in this embodiment are as follows.
In FIG. 32, first, the iron skin 4 of the combustion chamber furnace body 2 was installed, and then two layers of heat insulating bricks were constructed with a gap of 50 mm from the iron skin 4.

Next, as the expansion allowance portion 54, ceramic fibers were placed as fillers 56 at intervals between styrene foam spacers 55 of 30 mm square (thickness and height 30 mm) at a pitch of 460 mm in the height direction.
Furthermore, the refractory brick 53 was constructed on the inner side of the expansion margin 54, the checker brick 31 was further constructed on the inner side, and then the castable 51 was injected between the iron skin 4 and the heat insulating brick 52.
Construction by these procedures was repeated at a height of 1.2 m.

At this time, in the construction of the heat insulating brick 52, as shown in FIG. 32, the L-shaped ruler 4A is installed in the iron skin 4 at 16 locations in the circumferential direction, and the position of the inner side surface of the heat insulating brick 52 from the core 58 is set to the L shape. The ruler 4A was marked and connected to the inner surface of the lower heat-insulating brick 52 already loaded from that position by the water thread 4B, and the heat-insulating brick 52 was installed according to the water thread 4B. In addition, between adjacent L type | mold rulers 4A, it constructed, confirming a curvature with the R type | mold ruler of the same curvature as the inner surface of the iron skin 4 of the combustion chamber furnace body 2. FIG.

Next, a 30 mm square foam spacer 55 and a ceramic fiber filler 56 having a height of 460 mm corresponding to one step of the heat insulating brick 52 were applied to the expansion margin 54. And after constructing the firebrick 53 and the checker brick 31 inside, the castable 51 was inject | poured between the heat insulation brick 52 and the iron skin 4. FIG.
Castable injection is performed by applying approximately 100 kg (equivalent to a height of 250 mm) per site, and then repeating the same 100 kg injection at a position shaken 45 degrees from 8 locations in total, for a total of 5 laps (height 1250 mm).

As a result, the filling of the castable 51 was good, and when the behavior of the heat insulating brick 52 at the uppermost end portion was observed, there was no movement due to the load of the castable 51 and it was good.
Furthermore, in Example 1, the construction period of the furnace was completed in 7 months, which took 8 months with the conventional construction method, and the construction period could be shortened by 1 month.

The present invention relates to a method for constructing a hot stove, and can be used as a method for constructing a hot stove for supplying hot air to a blast furnace.

DESCRIPTION OF SYMBOLS 1 ... Hot air furnace 2 ... Combustion chamber furnace body 21 ... Burner 22 ... Fuel gas introduction part 23 ... Air introduction part 24 ... Hot air supply part 25 ... Connection pipe 3 ... Thermal storage room furnace body 31 ... Checker brick 32 ... Intake and exhaust port 4 ... Iron skin 41 ... Injection tube 4A ... L-shaped ruler 4B ... Water thread 5 ... Lining 51 ... Castable 52 ... Insulating brick 53 ... Refractory brick 54 ... Expansion margin 55 ... Spacer 55A ... Thin plate 55B ... Base 55D ... Small piece 55E ... Recess 55F ... concave groove 55G ... shaft material 55H ... honeycomb structure 56 ... filler 57 ... spacer 58 ... core C1-C4 ... hierarchy

Claims

The furnace body has an iron skin, and a lining formed inside the iron skin,
The lining is a method for constructing a hot stove having a castable installed inside the iron skin, a heat insulating brick installed inside the castable, and a refractory brick installed inside the heat insulating brick. And
The heat insulating brick and the refractory brick are installed at an interval inside the iron skin, and then the castable is injected between the iron skin and the heat insulating brick, and the heat insulating brick is a head from the castable. A hot-blast furnace characterized in that the inward force in the radial direction of the furnace body due to pressure is borne from the heat-insulating brick to the refractory brick, and the castable is solidified while preventing the heat-insulating brick from being displaced or divided. Building method.
In the method for building a hot stove according to claim 1,
The lining has an expansion allowance portion between the heat insulating brick and the refractory brick, between the heat insulating bricks, and between the refractory bricks, and the expansion allowance portion has a predetermined amount at room temperature. A method for constructing a hot stove, comprising a spacer having a strength and disappearing at an operating temperature of the hot stove.
In the hot-blast stove construction method according to claim 2,
The method of building a hot stove, wherein the spacer is a thermoplastic resin foam.
In the method for building a hot stove according to claim 2 or claim 3,
A method for constructing a hot stove characterized in that a filler that is soft or indefinite at room temperature is interposed in the expansion margin part together with the spacer.
In the method for constructing a hot stove according to any one of claims 1 to 4,
The hot stove has checker bricks installed inside the lining,
The castable pouring method is performed during or after the checker brick is installed.
In the method for constructing a hot stove according to any one of claims 1 to 5,
A furnace construction method for a hot stove, wherein the furnace body is divided into a plurality of sections arranged in a height direction, and the castable is injected for each section.
In the method for constructing a hot stove according to any one of claims 1 to 6,
The method for building a hot stove characterized in that the heat insulating bricks are installed in a plurality of layers in the thickness direction of the lining, and the horizontal joints in the circumferential direction of the heat insulating bricks of each layer are shifted from each other.
In the method for constructing a hot stove according to any one of claims 1 to 7,
The castable has a free flow value of 200 mm or more and 300 mm or less.