JP2002220609A - Stave cooler and stave body on tuyere part of furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stave cooler and a stave body 1 on a tuyere part of a blast furnace having long term stability, which do not deform a tuyere support by preventing the support 9 from receiving excessive load from tuyere brick 5, which do not generate gas flow from a space between the tuyere support and the tuyere brick, and which do not push up bosh brick 6, even when hearth wall brick 7 is thermally expanded. SOLUTION: The stave cooler arranged around the tuyere part of the blast furnace, and the stave body, are characterized by arranging a shelf-shaped jutting part 2 inside the furnace of the stave body 1a which composes the stave cooler, and by supporting the tuyere brick 5 surrounding the tuyere at the upper part of the jutting part 2. A thermal expansion absorption part consisting of a yielding mortar layer 12 is provided between the bottom of the shelf-shaped jutting part 2 and the hearth wall brick 7. A temperature probe 13 for detecting temperature around the inner surface of the furnace of the stave and a press fitting opening 14 of monolithic refractory are provided at a lower part of the shelf-shaped jutting part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stave cooler and a stave body provided around a tuyere of a blast furnace.

[0002]

2. Description of the Related Art In a blast furnace main body, a stave cooler is often used in order to protect an outer peripheral steel shell from a high-temperature furnace atmosphere. In a stave cooler, a stave main body is arranged inside a furnace of a steel shell, and a cooling water pipe is installed in the stave main body. The temperature of the steel shell is kept low by cooling the stave main body with cooling water.

At the tuyere portion of the blast furnace, as shown in FIG. 4, a tuyere 8 for feeding high-temperature air into the furnace is provided, and the tuyere 8 is held by a large circle 9.
0, and the Daimaru holding hardware 10 is a steel shell 11 around the blast furnace.
Fixed to The tuyere brick 5 is arranged so as to surround the Daimaru 9, and the stave body 1 a of the tuyere stove cooler is arranged between the tuyere brick 5 and the steel shell 11. As shown in FIG. 3C, a plurality of cooling water pipes 3 are arranged in the stave body 1, and cooling water is supplied via a cooling water pipe 15. The stave body 1 is cooled by the cooling water flowing through the cooling water pipe 3, and heat from the inside of the furnace is shut off to protect the steel shell 11 outside the stave body. The tuyere brick 5 is shown in FIG.
As shown in (a), a plurality of bricks (5a to 5d) are formed so as to surround the Daimaru 9.

[0004] A hearth brick is built on the hearth of the blast furnace hearth, and a hearth wall brick 7 is built on the hearth wall above it. Hearth bricks and hearth wall bricks are often made of carbon bricks. As shown in FIG. 4, the tuyere brick 5 is constructed so as to ride on the hearth wall brick 7, and a bosh section brick 6 is constructed above the tuyere brick 5. It was the structure of the blast furnace body.

[0005] The tuyere 8 and the large circle 9 surrounded by the tuyere brick 5 are fixed to an iron shell 11, and the iron shell 11 is kept at a low temperature and has little thermal expansion. Hardly change. On the other hand, the hearth brick and the hearth wall brick 7 are heated to a high temperature to store hot metal and slag in the furnace and thermally expanded.
Due to this thermal expansion, the tuyere brick 5 built on the hearth wall brick 7 is pushed upward. In such a structure, the tuyere 8 and the Daimaru 9 receive the load deformed upward by the tuyere brick 5. For this reason, a shrinkable mortar layer 12 as shown in FIG. 4 was provided between the lower part of the Daimaru 9 and the tuyere brick 5, and the tuyere brick 5 was pushed upward by the thermal expansion of the hearth wall brick 7. In this case, the shrinkable mortar layer 12 was prevented from applying an excessive load to the Daimaru 9 from the pushed tuyere brick 5.

[0006]

SUMMARY OF THE INVENTION Daimaru 9 and tuyere 8
The periphery is protected by the tuyere brick 5 while being fixed by the Daimaru holding hardware 10. If the compressible mortar layer 12 provided between the lower part of the Daimaru 9 and the tuyere brick 5 is too thick, the tuyere 8, the Daimaru 9 and the Daimaru holding hardware by the tuyere brick 5 when the mortar layer is lost. 10 may be insufficiently protected. Therefore, the shrinkable mortar layer 12
Cannot be too thick. For this reason, sometimes the shrinkage allowance of the shrinkable mortar is not enough, or in the latter half of the life of the furnace, due to the increase in the amount of thermal expansion of the hearth wall brick due to the rise in the hearth wall temperature, the tuyere It is pushed upward and deformed, and the contact surface between the tuyere 8 and the tuyere Daimaru 9,
Alternatively, the contact surface between the tuyere Daimaru 9 and the Daimaru holding hardware 10 may be distorted, leading to gas leakage.

When the tuyere brick 5 is pushed upward by the expansion of the hearth wall brick 7, a cavity is formed between the upper part of the tuyere daimaru and the tuyere brick 5, from which hot gas is discharged. 6, a gas flow path may be formed to damage the morning glory brick and the morning glory stave.

Further, when the tuyere brick 5 is pushed up by the expansion of the hearth wall brick 7, the bosh section brick 6 built on the tuyere brick 5 is pushed up by the tuyere brick 5, and the bosh section brick is raised. A gap is generated between the stove 6 and the stave 1 and the furnace is subjected to side pressure due to the furnace internals, resulting in an unstable situation, breaking the brick joint and impairing the strength of the building.

The present invention prevents the tuyere brick from applying an excessive load to the tuyere daimaru even when the hearth wall brick is thermally expanded, thereby preventing the tuyere daimaru from being deformed. It is an object of the present invention to provide a blast furnace tuyere stave cooler and a stave main body that do not generate a gas flow from a gap between the Daimaru and the tuyere brick and maintain stability without pushing up the bosh brick.

[0010]

That is, the gist of the present invention is as follows. (1) In a stave cooler provided around a tuyere portion of a blast furnace, a shelf-like protrusion 2 is provided inside the furnace of a stave body 1a constituting the stave cooler, and a tuyere brick 5 surrounding the tuyere is formed by the protrusion. 2. A stove cooler at the tuyere of a blast furnace, which is supported at an upper part of the stove. (2) The blast furnace blade according to (1), wherein a thermal expansion absorbing portion is provided between the lower surface of the shelf-shaped protrusion 2 provided on the stave body 1a and the hearth wall brick 7. Mouth stave cooler. (3) Below the shelf-shaped protrusion 2 of the stave body provided around the tuyere, a temperature detection end 13 for detecting a temperature near the inner surface of the stave furnace, and a pressure inlet for irregular refractories. 14. The stove cooler for a blast furnace tuyere according to the above (1) or (2), wherein the stove cooler is provided. (4) A stave main body 1a provided around a blast furnace tuyere, wherein a shelf-shaped protrusion 2 is provided inside the furnace of the stave main body. (5) A temperature detecting end installation part for detecting a temperature near the furnace inner surface of the stave and a press-in installation part for press-fitting an indeterminate refractory are provided below the shelf-shaped protrusion 2. The stave body according to the above (4), which is characterized in that:

According to the present invention, a stave cooler provided around a tuyere portion of a blast furnace is provided with a shelf-shaped protruding portion 2 inside the furnace of a stave body (tuyere stave body 1a) constituting the stave cooler. Since the tuyere brick 5 surrounding the mouth is supported at the upper part of the protruding portion 2, the tuyere brick 5 is independent from the hearth wall brick 7 built thereunder.

As a result of adopting such a structure, the thermal expansion of the hearth brick and the hearth wall brick is absorbed below the shelf-shaped protrusion 2 of the tuyere stave body, and the tuyere brick 5 and the upper part thereof. Does not affect the position of the morning glory brick 6. Therefore, the gap between the tuyere brick and the tuyere part of Daimaru etc. is kept constant throughout the furnace cost without moving relatively, and the hearth wall temperature rises late in the life of the furnace and the amount of thermal expansion of the brick may increase. Even if there is, Daimaru is pushed up by tuyere bricks and deforms,
The contact surface with the tuyere or the Daimaru holding hardware is not distorted and gas leakage does not occur. Therefore, it is not necessary to provide a shrinkable mortar layer between the lower part of the Daimaru 9 and the tuyere brick 5 as in the related art, and the interval between the Daimaru 9 and the tuyere brick 5 is set to the minimum necessary thickness. be able to.

Since the position of the tuyere brick is maintained at a constant level, no cavity is formed between the upper part of the tuyere brick and the tuyere brick 5, and the hot gas flows to the back of the bosh section brick 6. There is no problem of damaging the morning glory brick or the morning glory stave by creating the gas flow path.

Further, since the bosh brick 6 built on the tuyere brick 5 is not pushed up by the tuyere brick 5, the bosh brick only generates its own thermal expansion.
The gap between the stave and the stave is very small, if any, and can maintain the strength of the building.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stave cooler and a stave body according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the tuyere portion is such that a large round holding metal 10 is fixed to a steel shell 11, a large circle 9 is arranged at a tip of the large round holding metal 10, and a tuyere 8 is arranged at a tip of the large circle 9. It is formed by doing. The iron skin around the Daimaru holding hardware 10 is cooled and protected by the tuyere stave body 1a.
A tuyere brick 5 is built around the.

As shown in FIG. 2, the tuyere stave body 1a usually has a semicircular opening (the tuyere opening 1) on both sides.
6) and the tuyere stave body 1 having the same shape
a are arranged side by side as shown in FIG. The large round holding hardware 10 is arranged so as to be surrounded by a circular tuyere opening 16 formed by the tuyere stave main bodies 1a arranged side by side.

The tuyere stave body 1a of the present invention is shown in FIG.
As shown in FIG. 3, a shelf-shaped protrusion 2 is provided directly below the portion where the tuyere is arranged and on the side inside the furnace. When the tuyere brick 5 is constructed so as to be placed on the shelf-shaped protrusion 2, the tuyere brick 5 can be constructed around the tuyere large circle 9 as shown in FIG. The tuyere brick 5 is usually
As shown in (a), the block is divided into a plurality of blocks (5a to 5d), and the block is constructed by combining these blocks to form a shape surrounding the periphery of the large circle 9.

FIG. 3 shows the inside of the tuyere stave body 1a.
A cooling water pipe 3 is provided as shown in FIG. A cooling water pipe is also arranged inside the shelf-shaped protrusion 2 to cool the protrusion. Cooling water is continuously supplied to the cooling water pipe 3 via a cooling water pipe 15.

A heat insulating material layer 4 shown in FIGS. 1 and 2 may be provided at the tip of the shelf-shaped protrusion 2 on the inner side of the furnace. This can prevent the tip of the shelf-shaped protrusion 2 from being exposed to an excessively high temperature. As the heat insulating material layer 4,
High alumina brick, carbon brick, laminated stainless expanded metal, or the like can be used. The thickness of the heat insulating material layer 4 in the blast furnace main body radial direction is 90 to 1
It is preferable to set it to about 50 mm. Within this range, the thickness is sufficient to alleviate the heat fluctuation in the furnace, and the workability of integral casting with the stave can be kept good.

The hearth wall brick 7 constructed below the tuyere is
The furnace expands due to high temperature. Since the shelf-shaped protrusion 2 of the tuyere stave body 1a projects above the uppermost end of the hearth wall brick 7, between the upper end of the hearth wall brick 7 and the shelf-shaped protrusion 2, As described in the above (2) of the present invention, it is preferable to provide a thermal expansion absorbing portion for coping with the thermal expansion of the hearth wall brick. As shown in FIG. 1, the thermal expansion absorbing portion is preferably a shrinkable mortar layer 12 filled with shrinkable mortar. Since the mortar has shrinkability, when the hearth wall brick thermally expands, the shrinkable mortar layer 12 contracts to reduce the thickness of the thermal expansion absorbing portion, thereby absorbing thermal expansion. . Further, since the shrinkable mortar is filled in the thermal expansion absorbing portion, the shelf-like protrusion 2 of the tuyere stave main body 1 can be protected from high temperature in the furnace. As the shrinkable mortar, a kneaded product of ceramic fiber and corundum mortar or the like can be used. The thickness of the thermal expansion absorbing section in the blast furnace furnace height direction is preferably about 40 to 60 mm at the time of building at room temperature. This is because, from the coefficient of thermal expansion of the hearth wall brick and the assumed brick temperature, if the thickness of the thermal expansion absorbing portion is about this thickness, the thermal expansion of the hearth wall brick can be absorbed.

If the thickness of the thermal expansion absorbing portion between the shelf-shaped protrusion 2 and the upper end of the hearth wall brick becomes too large, or if the mortar of the shrinkable mortar layer 12 disappears, the thermal expansion absorbing portion is not absorbed. There is a possibility that high-temperature gas flows between the hearth wall brick and the stave body through the section, and a gas passage toward the lower part of the furnace is formed. On the other hand, as described in the above (3) of the present invention, the temperature detecting end 13 for detecting the temperature near the furnace inner surface of the stave and the irregular refractory are provided below the protruding portion 2 of the tuyere stave main body 1a. It is preferable to provide an object pressure inlet 14 (FIG. 1). When a high-temperature gas flows between the hearth wall brick and the stave body, the temperature of the temperature detecting end 13 rises, so that the inflow of the high-temperature gas can be detected. When the inflow of the high-temperature gas is detected, the irregular-shaped refractory is press-fitted from the irregular-shaped refractory press-in port 14, so that the irregular-shaped refractory is inserted into the thermal expansion absorbing section between the shelf-shaped protrusion 2 and the upper end of the hearth wall brick. It can be filled with refractory material and shut off the gas flow path. By installing a thermometer at the temperature detection end installation portion arranged on the tuyere stave body 1a, the temperature detection end 13 can be obtained. Similarly, by installing a pressure inlet at a pressure inlet installation portion disposed on the tuyere stave main body 1a, the irregular refractory pressure inlet 14 can be obtained.

[0023]

According to the present invention, in a stave cooler provided around a tuyere portion of a blast furnace, a shelf-shaped protruding portion 2 is provided inside the furnace of a stave body (tuyere stave body) constituting the stave cooler, Since the tuyere brick surrounding the tuyere is supported at the upper part of the protrusion, even if there is thermal expansion of the hearth wall brick, the tuyere brick is prevented from applying an excessive load to the tuyere daimaru. The long-term stability can be maintained without causing deformation of the tuyere Daimaru, generating gas flow from the gap between the tuyere brick and the tuyere brick, and without pushing up the morning glory brick.

According to the present invention, by providing a thermal expansion absorbing portion for coping with the thermal expansion of the hearth wall brick between the upper end of the hearth wall brick and the shelf-shaped projection portion, the shelf-shaped projection portion is formed. It can be prevented from being pushed up by the hearth wall brick.

According to the present invention, a temperature detecting end for detecting a temperature near a furnace inner surface of a stave and a pressure inlet for an irregular-shaped refractory are provided below the shelf-shaped protrusion of the tuyere stave body. When high-temperature gas flows between the wall brick and the stave body, it is detected by the temperature detection end, and the irregular refractory is injected into the thermal expansion absorption part by injecting the irregular refractory from the pressure inlet of the irregular refractory. An object can be filled and the gas flow path can be blocked.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a blast furnace tuyere stave cooler of the present invention.

FIG. 2 is a perspective view showing a stave body in a blast furnace tuyere stave cooler of the present invention.

3A is a conceptual diagram illustrating a positional relationship between a tuyere brick and a Daimaru, FIG. 3B is a conceptual diagram illustrating a positional relationship between a tuyere stave body and a Daimaru holding hardware, and FIG. It is sectional drawing which shows the cooling water pipe in a part stave main body.

FIG. 4 is a partial sectional view showing a conventional blast furnace tuyere stave cooler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stave main body 1a Tuyere stave main body 2 Shelf-shaped projection part 3 Cooling water pipe 4 Insulation material layer 5 Tuyere brick 6 Bosh section brick 7 Furnace floor wall brick 8 Tuyere 9 Daimaru 10 Daimaru holding hardware 11 Iron 12 Possible Shrinkable mortar layer 13 Temperature detection end 14 Irregular refractory pressure inlet 15 Cooling water pipe 16 Tuyere opening 17 Ventilation branch pipe

Claims (5)

[Claims] 1. A stave cooler provided around a tuyere portion of a blast furnace, wherein a stave-like protruding portion is provided inside a furnace of a stave body constituting the stave cooler, and a tuyere brick surrounding the tuyere is connected to the protruding portion of the stave cooler. A stave cooler at the tuyere of the blast furnace, which is supported at the top. 2. A blast furnace tuyere according to claim 1, wherein a thermal expansion absorbing portion is provided between a lower surface of the shelf-shaped protrusion provided on the stave body and a hearth wall brick. Stove cooler. 3. A temperature detecting end for detecting a temperature near a furnace inner surface of a stave, and a pressure inlet for an irregular-shaped refractory, below the shelf-shaped protrusion of the stave body provided around the tuyere. The stave cooler for a tuyere part of a blast furnace according to claim 1 or 2, wherein: 4. A stave body provided around a tuyere portion of a blast furnace, wherein a stave-shaped protrusion is provided inside the furnace of the stave body. 5. A lower portion of the shelf-shaped protrusion portion is provided with a temperature detection end installation portion for detecting a temperature near the inner surface of the stave furnace and a press-in installation portion for press-fitting an irregular refractory. The stave body according to claim 4, characterized in that: