JP5949683B2 - Hot Blast Gitter Brick - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hot blast furnace jitter brick constructed by a hexagonal column-shaped brick that is stacked in a heat storage chamber of a hot blast furnace attached to a blast furnace.

Conventionally, in blast furnace operation, high temperature blast furnace blast has been demanded in order to reduce fuel costs.
Blast furnace blasting is generally a through-hole formed in a brick brick that operates three to five hot blast furnaces attached to the blast furnace alternately one by two, and incorporates high-temperature combustion gas generated in the combustion chamber into the heat storage chamber. The sensible heat of the combustion gas is stored in the glitter brick, and then the air blown to the blast furnace is circulated through the through hole of the glitter brick to be supplied as hot air to the blast furnace.

  As for the above-mentioned glitter bricks, those shown in FIG. 10 are generally used, and the structure thereof is such that a large number of holes 102 are penetrated in the axial direction of the hexagonal prism unit brick 101, and the side surfaces of the unit bricks 101 are arranged side by side. Are placed in contact with each other in a so-called “honeycomb shape”. Such glitter bricks are stacked and filled in the heat storage chamber to a total height of 25 to 40 m so that the through holes communicate with each other in the vertical direction.

And the blowing temperature in a hot stove greatly depends on the structure of the jitter brick, that is, the heat exchange rate. Therefore, various studies have been made on the method of covering the heat exchange rate in a hot stove.
The through hole of the above-mentioned glitter brick is generally cylindrical on the inner surface. For this reason, the heat transfer area of each gas hole in contact with the high-temperature combustion gas is small and the efficiency of heat exchange (heat storage) is not high, and it was necessary to increase the volume of the brick brick when newly installed.

As an improvement measure, techniques described in Patent Documents 1 to 3 have been proposed from conventional examples.
In the hot brick furnace brick described in Patent Document 1, a spiral concave protrusion is formed on the inner peripheral surface of the through-hole to increase the heat transfer area.
In addition, the hot brick furnace brick described in Patent Document 2 has a stepped protrusion formed on the upper end side of the inner wall surface of the through hole to increase the heat transfer coefficient.

Furthermore, the hot brick furnace bricker described in Patent Document 3 increases the heat transfer area by inclining the through holes.
In addition, the hot brick furnace bricker described in Patent Document 4 is formed so that the inner surface shape of the through-hole is roughly petal-shaped with six irregularities to increase the heat transfer area.

Japanese Utility Model Publication No. 52-41306 Japanese Patent Publication No.57-34322 JP-A-62-83413 Japanese Patent No. 4015052

However, in the conventional examples described in Patent Documents 1 and 2, the heat storage efficiency can be improved by promoting the turbulent flow in the flow of the combustion gas or air in the through hole. Due to the complicated shape of the through-hole, there are unsolved problems such as large pressure loss and difficulty in removing from the formwork during brick molding, which increases production costs.
In addition, in the conventional example described in Patent Document 3, the heat transfer area is increased by inclining the through-hole, but a through-hole having the same outer shape and the same planar shape as the conventional glitter brick is formed. There is an unresolved issue that the refractory has a thin thickness of approximately 20 mm or less, the strength is insufficient when bricks are manufactured, installed, and used, breakage occurs frequently, and is not a practical technology. is there.

Further, in the conventional example described in Patent Document 4, the shape of the through hole is formed in a substantially petal shape having six irregularities, thereby increasing the heat transfer area. However, although the heat transfer area increase ratio is described as 2.06 times the maximum of the circular shape, it is the maximum practical shape for the circular shape as a practical shape not to make a constricted part in the glitter brick in terms of durability. There is an unsolved problem that it is about 1.5 times and a significant increase in heat transfer area cannot be expected.
Therefore, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and the hot air furnace in which the heat transfer area of the glitter brick is dramatically increased while suppressing the pressure loss in the glitter brick. The purpose is to provide a brickwork brick.

In order to achieve the above object, a first aspect of the hot-blast stove Gitter brick according to the present invention is a hot-blast stove Gitter brick whose outer shape stacked in the heat storage chamber of the hot stove is composed of bricks having a hexagonal columnar shape. Then, on the inner wall surface of the through-hole provided in the axial direction in the brick unit alone, first ridges and first ridges extending in the hot air flow direction and continuous in the circumferential direction are alternately formed. A plurality of second ridges are formed on one side formed by the first ridges and the first ridges, and the first ridges and the first ridges have an apex angle of 60 degrees or less. A plurality of second ridges are formed on one side formed by the first ridges and the first ridges, and the heat transfer area is a simple cylindrical inner wall surface. It is increased 2.1 times or more.

Moreover, the second aspect of the hot-blast stove Gitter brick according to the present invention is a hot-blast stove Gitter brick whose outer shape is a hexagonal column-shaped brick that is stacked in the heat storage chamber of the hot stove. On the inner wall surface of the through-hole provided in the axial direction, first ridges and first ridges extending in the hot air flow direction and continuing in the circumferential direction are alternately formed, and each first A plurality of second ridges are formed on one side formed by the ridges and the first ridges, and the first ridges and the first ridges are isosceles triangles whose apex angle exceeds 60 degrees. A plurality of the second protrusions are formed on one side formed by the first protrusions and the first recesses, and the second protrusions are equilateral triangles having an apex angle of 60 degrees or less. Or it has the shape of an isosceles triangle, and is increasing the heat-transfer area 2.1 times or more compared with a simple cylindrical inner wall surface.

Moreover, as for the 3rd aspect of the hot-blast stove Gitter brick which concerns on this invention, the said 1st protruding item | line and the 1st recessed item | line are formed 10 or more in the inner wall face of the said through-hole.

  According to the present invention, it is easy to produce hot-blast stove-type bricks stacked in a heat storage chamber of a hot stove, and there is no problem in strength at the time of use, and the increase in pressure loss is suppressed, and further, the hot stove by increasing the heat transfer area Improvement of exhaust heat efficiency can be achieved at the same time. In addition, when a hot stove is newly installed, the volume of the glitter brick can be reduced as compared with the conventional one, and the construction cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a schematic configuration of a first embodiment of a hot-blast furnace glitter brick according to the present invention. It is a top view which expands and shows the through-hole of FIG. It is a top view which expands further and shows the 2nd recessed part of the through-hole of FIG. It is a top view in the state where three hot brick stove bricks were combined. It is an enlarged plan view which shows the modification of a 2nd recessed part. It is a perspective view which shows schematic structure of the 2nd Embodiment of this invention. It is a top view which expands and shows the through-hole of FIG. It is a top view which expands and shows the 2nd recessed part of the through-hole of FIG. It is an enlarged plan view which shows the modification of a 2nd recessed part. It is a perspective view which shows the conventional brick for hot stove furnaces.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a hot-blast furnace jitter brick according to a first embodiment of the present invention. FIG. 2 is an enlarged plan view of the through hole, and FIG. 3 is a second recess of the through hole. FIG. 4 is a plan view obtained by combining three hot-blast furnace glitter bricks.

  In the figure, reference numeral 1 denotes a hot blast furnace jitter brick arranged in a hot blast furnace attached to the blast furnace. As shown in FIG. 1, the hot-blast furnace glitter brick 1 is composed of a single brick 2 whose outer shape is formed in a hexagonal prism shape. The single brick 2 has a through hole 3a extending in the axial direction, that is, along the flow direction of hot air inside the axial center, and an axial direction formed on the radiation from the center of the through hole 3a toward the apex of the hexagon. That is, a total of seven through-holes are formed with six through-holes 3b to 3g extending along the flow direction of hot air, and through-holes extending in the axial direction for 1/3 of the circumference at each top position Through-hole forming portions 5a to 5f extending in the axial direction for a half circumference are formed at the center position of the side connecting the forming portions 4a to 4f and the respective top portions.

  As shown in an enlarged view in FIG. 2, the inner peripheral walls of the through holes 3a to 3g and the through hole forming portions 4a to 4f and 5a to 5f are radially inward with respect to the circular through hole 6 shown by a one-dot chain line. 16 first protrusions 7 that protrude and extend in the axial direction are formed, and the first protrusions 7 are recessed between the first protrusions 7 inward in the radial direction from the circular through hole 6 and extend in the axial direction. Sixteen first concave stripes 8 are formed. That is, the first protrusions 7 and the first recesses 8 are alternately formed in the circumferential direction on the inner peripheral walls of the through holes 3a to 3g and the through hole forming portions 4a to 4f and 5a to 5f.

  The first ridges 7 and the first ridges 8 are formed in a regular triangle shape having an apex angle of, for example, 60 degrees when viewed from the plane as shown in an enlarged view in FIG. Similarly, the concave strip 8 is also formed in a regular triangle having an apex angle of 60 degrees when viewed from the plane. The shapes of the first ridges 7 and the first ridges 8 are not limited to equilateral triangles, and may be formed as isosceles triangles having apex angles of less than 60 degrees.

  A plurality of second ridges 11a and 11b are formed on one side formed by the first ridges 7 and the first ridges 8 as shown in an enlarged view in FIG. The second ridge 11a is formed in an isosceles triangle shape having an apex angle of 120 degrees when viewed from the plane on both side surfaces of the first ridge 7, and the second ridge 11b is formed in the first recess. It is formed in the shape of an isosceles triangle whose top is 120 degrees as viewed from the plane formed on both inner surfaces of the strip 8 and connected to the second convex strip 11a. These second ridges 11a and 11b may have the same shape or similar shapes. Further, the number of the second ridges 11a and 11b is not limited to two, and an arbitrary number of three or more may be formed.

  For example, as shown in FIG. 4, the three hot-blast furnace jitter bricks 1 </ b> A to 1 </ b> C having the above-described configuration are brought into contact with each other to form a honeycomb structure as shown in FIG. 4. 1 / 3-round through-hole forming part 4d formed at the top of the hot-blast stove Gitter brick 1A at the joining position, and 1 / 3-round through-hole formed at the top of the hot-blast furnace Gitter brick 1B The first protrusion 7 and the first recess 8 and the second protrusion 4b and the through-hole formation part 4b for 1/3 of the circumference formed on the top of the hot brick furnace brick 1C are connected to each other. One through hole having the ridges 11a and 11b is formed.

Moreover, the through-hole formation part 5c for 1/2 circumference formed in the edge | side of the hot brick furnace brick 1A and the through-hole formation part 5f for 1/2 circumference formed in the edge | side of the hot brick furnace brick 1B. Are connected to each other to form one through-hole having the first ridge 7 and the first recess 8 and the second ridges 11a and 11b.
Similarly, the through hole forming part 5e for 1/2 circumference formed in the side of the hot brick furnace brick 1B and the through hole forming part for 1/2 circumference formed in the side of the hot brick furnace brick 1C. 5b is connected and the 1st protruding item | line 7 and the 1st recessed item | line 8 and the 1st through-hole which has 2nd protruding item | line 11a, 11b are formed.

  Furthermore, the through hole forming part 5a for 1/2 turn formed on the side of the hot brick furnace brick 1C and the through hole forming part 5d for 1/2 turn formed on the side of the hot brick furnace brick 1A. Are connected to each other to form one through-hole having the first ridge 7 and the first recess 8 and the second ridges 11a and 11b.

Thus, according to the first embodiment, the first ridges 7 and the first ridges 8 are formed on the inner peripheral surfaces of the through holes 3a to 3g and the through hole forming portions 4a to 4f and 5a to 5f. By forming and forming a plurality of second ridges 11a and 11b on one side formed by the first ridges 7 and the first ridges 8, the through holes 3a to 3g and the through hole forming part 4a are formed. The heat transfer area with the through holes formed by collecting ˜4f and 5a to 5f can be increased by about 2.3 times compared to the cylindrical heat transfer area shown in FIG. The dimensionless shape factor k determined by the shape of the through hole in this case is expressed by the following equation (1) based on the circumferential length L of one through hole and the cross-sectional area (gas passage cross-sectional area) A of one through hole. expressed.
k = L / √A (1)
At this time, in the first embodiment, when the hole diameter is 45 mmφ, L is 326.3 mm and A is 1590 mm ² , so the shape factor k is 8.18.

  Here, when the shape of the through hole is the petal shape described in Patent Document 4 described above, when the shape factor k exceeds 7.3, the petal shape is made of a material that is a refractory material. Since the refractory material is not uniformly filled, it is not preferable. However, as in the first embodiment, the first ridges 7, the first ridges 8, and the first ridges 7 are not preferable. When a plurality of second ridges 11a and 11b are formed on one side formed by the first ridge 8, as shown in an enlarged view in FIG. 3, it is a combination of ridges and ridges as a whole. Since the arc shape is not complicated like the petal shape, the filling of the refractory material can be easily performed without unevenness even if the shape factor k is 7.4 or more.

  In addition, in the present embodiment, since the second ridges 11a and 11b are formed on one side formed by the first ridges 7 and the first recesses 8, the petal shape described in Patent Document 4 described above is used. Thus, the constricted portion does not occur, and the strength during use can be sufficiently secured. Furthermore, since the 1st protruding item | line 7 and the 1st recessed item | line 8 and the 2nd protruding item | line 11a, 11b are extended in the axial direction of the hot brick furnace brick 1, the increase in pressure loss can be suppressed. .

  Therefore, according to the first embodiment, it is easy to manufacture the hot-blast stove Gitter brick stacked in the heat storage chamber of the hot stove, there is no problem in strength at the time of use, there is almost no increase in pressure loss, and the transmission. Improvement of the exhaust heat efficiency of the hot stove by increasing the heat area can be achieved at the same time. In addition, since the heat transfer area can be increased, when a hot stove is newly installed, the volume of the glitter brick can be reduced as compared with the conventional one, and the construction cost can be reduced.

  In the first embodiment, the case where the first ridges 7 and the first ridges 8 and the second ridges 11a and 11b are formed in a triangular shape has been described. However, the present invention is not limited to this. As shown in FIG. 5, R chamfered portions 12 are formed at the triangular corners of the first ridges 7 and the first ridges 8 and the second ridges 11a and 11b. You may make it give roundness as a whole. In this case, since sharp corners are not formed, the refractory filling can be performed more easily without making the refractory filling uneven when manufacturing the hot brick furnace brick 1.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the apex angles of the first ridges and the first ridges are made larger than those in the first embodiment described above, and a large number of second ridges can be formed.
That is, in the second embodiment, the outer shape of the hot-blast stove Gitter brick 1 and the numbers and arrangement positions of the through holes 3a to 3g, the through hole forming portions 4a to 4f and 5a to 5f are the same as those in FIG.

  However, the shapes of the first ridges 7 and the first ridges 8 formed on the inner peripheral walls of the through holes 3a to 3g and the through hole forming portions 4a to 4f and 5a to 5f are both set to an apex angle of 120 degrees. It is formed in an isosceles triangle shape. The number of the first ridges 7 and the first ridges 8 is set to 12 in one through hole. Here, the length of the isosceles side of the first ridge 7 is set shorter than the length of the isosceles side of the first recess 8.

  And the 2nd protruding item | line 21 is formed in the edge | side which the 1st protruding item | line 7 and the 1st recessed item | line 8 comprise, as shown in FIG. The second ridges 21 are formed in the shape of an equilateral triangle when viewed from a plane having an apex angle of 60 °. The pieces are connected and formed. Here, a convex non-formed portion 22 where the second convex 21 is not formed is formed at the top of the first concave 8, and the second convex formed on the isosceles side of the first concave 8. The strips 21 are configured not to interfere with each other.

  According to the second embodiment, the number of the first ridges 7 and the first ridges 8 are both 12, which is smaller than the 16 of the first embodiment described above. The number of the second convex stripes 21 formed on one side formed by the stripes 7 and the first concave stripes 8 is set to be larger than seven and two in the first embodiment. For this reason, the heat transfer area magnification with respect to the circular through-hole in one through-hole can be increased to about 2.3 times as in the first embodiment.

At this time, in the second embodiment, when the hole diameter is 45 mmφ, the circumferential length L is 326.3 mm and the cross-sectional area A is 1590 mm ² , so the shape factor k is 8.18.
Therefore, when a plurality of second ridges 21 are formed on one side formed by the first ridges 7 and the first ridges 8 and the first ridges 7 and the first ridges 8. Is a combination of ridges and ridges as a whole, as shown in an enlarged view in FIG. 8, and does not have a complicated arc shape like a petal shape. Therefore, even if the shape factor k is 7.4 or more, fire resistance The filling of the material can be easily performed without becoming uneven.

  Moreover, in this embodiment, since the second ridges 21 are formed on one side formed by the first ridges 7 and the first ridges 8, like the petal shape described in Patent Document 4 described above. Therefore, it is possible to ensure sufficient strength during use. Furthermore, since the 1st protruding item | line 7 and the 1st recessed item | line 8 and the 2nd protruding item | line 21 are extended in the axial direction of the hot-blast stove for the brick 1 for a furnace, the increase in a pressure loss can be suppressed.

Therefore, according to the second embodiment, it is easy to manufacture hot-blast stove Gitter bricks stacked in the heat storage chamber of the hot stove, there is no problem in strength during use, and an increase in pressure loss can be suppressed. Improvement of exhaust heat efficiency of the hot stove by increasing the heat transfer area can be achieved at the same time. In addition, since the heat transfer area can be increased, when a hot stove is newly installed, the volume of the glitter brick can be reduced as compared with the conventional one, and the construction cost can be reduced.
In the second embodiment, the case where the first ridges 7 and the first ridges 8 are composed of isosceles triangles having an apex angle of 120 degrees has been described. However, the present invention is not limited to this. What is necessary is just to form an apex angle with the substantially isosceles triangle exceeding 60 degree | times rather than a thing.

Similarly, the second ridges 21 are not limited to equilateral triangles, and may be isosceles triangles having apex angles of less than 60 degrees.
Moreover, in the said 2nd Embodiment, although the case where the 2nd protruding item | line 21 was formed by the equilateral triangle which has a corner | angular part, or an isosceles triangle was demonstrated, it is not limited to this, FIG. As shown in FIG. 2, the chamfer may be applied to the top and the connecting portion of the second ridge 21. In this case, since sharp corners are not formed, the refractory filling can be performed more easily without making the refractory filling uneven when manufacturing the hot brick furnace brick 1.

In the first and second embodiments, the case where the through hole is a substantially cylindrical surface having the same vertical sectional area is described. However, the through hole is used as a conical inner surface having a slight taper for a hot stove. You may make it easy to extract from the formwork used for manufacture of the glitter brick 1. FIG.
Furthermore, in the first and second embodiments, the case where the cross-sectional area magnification with respect to the cross-sectional area of the cylindrical surface is set to 2.3 has been described. However, the present invention is not limited to this, and the cross-sectional area magnification is set to 2 The shape factor k may be set to 7.4 or more by setting it to .1 or more. For this purpose, the number of the first ridges 7 and the first ridges 8 may be set to 10 or more, and the number of the second ridges 11a, 11b and 21 may be set to 2 or more. .

  DESCRIPTION OF SYMBOLS 1,1A-1C ... Gitter brick for hot-blast furnaces, 2 ... Single unit brick, 3a-3g ... Through-hole, 4a-4f, 5a-5f ... Through-hole formation part, 6 ... Circular through-hole, 7 ... 1st protruding item | line , 8... First concave strip, 11a, 11b... Second convex strip, 12... Chamfered portion, 21.

Claims (3)

It is a hot-blast furnace Gitter brick whose outer shape stacked in the heat storage chamber of the hot-blast furnace is composed of hexagonal columnar bricks,
Extending along the flow direction of hot air on the inner wall surface of the through hole provided in the axial direction in the brick alone, alternately forming first ridges and first ridges continuous in the circumferential direction, A plurality of second ridges are formed on one side formed by each first ridge and the first groove ,
The first ridge and the first groove have a shape of an equilateral triangle or an isosceles triangle having an apex angle of 60 degrees or less, and one side formed by the first ridge and the first groove. A hot blast furnace brick brick characterized by having a plurality of second ridges formed thereon and having a heat transfer area increased 2.1 times or more compared to the inner wall surface of a simple cylinder . It is a hot-blast furnace Gitter brick whose outer shape stacked in the heat storage chamber of the hot-blast furnace is composed of hexagonal columnar bricks,
Extending along the flow direction of hot air on the inner wall surface of the through hole provided in the axial direction in the brick alone, alternately forming first ridges and first ridges continuous in the circumferential direction, A plurality of second ridges are formed on one side formed by each first ridge and the first groove,
The first ridge and the first groove have an isosceles triangle shape with an apex angle exceeding 60 degrees, and a plurality of edges are formed on one side formed by the first ridge and the first groove. The second ridge is formed, and the second ridge has a shape of an equilateral triangle or an isosceles triangle having an apex angle of 60 degrees or less, and the heat transfer area is 2. Checker fireclay bricks heat air furnace you characterized in that increased to more than 1 times. 10 or more of said 1st protruding item | line and 1st recessed item | strip | row are formed in the inner wall face of said through-hole, The hot-blast furnace jitter brick according to claim 1 or 2 characterized by the above-mentioned.

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