JPH01275437A - Checkerwork brick for regenerator and its laying method - Google Patents

Abstract

PURPOSE:To prevent the thermal cracking due to internal stress and to improve durability and serviceability by using a cylindrical brick. CONSTITUTION:The cylindrical checkerwork brick 1 for a regenerator has parallel top face 1a and bottom face 1b on its both ends. The protrusion 2 and recess 3 for engagement can be provided on the top face 1a and bottom face 1b of the brick 1. When the thickness of the brick 1 is decreased to a thickness optimum for heat transmission, high laying stability can be secured. In addition, the internal stress caused by repeated heating and cooling is uniformized, the mechanical strength is also high, and the serviceability and durability are improved. The bricks 1 are vertically laid on one another in the form of checkers to construct a regenerator.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a lattice brick for a heat storage chamber and a method for constructing the same, particularly in a tank kiln for glass melting, etc. The present invention relates to a lattice brick for a heat storage chamber that can be significantly improved and a method for constructing the same.

[Prior Art] A tank kiln for melting glass is equipped with a heat storage chamber, which serves as a heat storage medium, and has an internal structure constructed of bricks in a lattice shape called a checker splitter.

Conventionally, straight-shaped (cuboid-shaped) bricks have been used as lattice bricks for heat storage chambers. When using this straight brick, the thickness of the brick needs to be approximately 60 to 75 mm in order to ensure construction stability. However, when considering heat transfer efficiency, it is said that the most efficient brick thickness is approximately 30 to 40 mm, and straight bricks have disadvantages in terms of thermal efficiency.

In order to solve this problem of reduced thermal efficiency caused by brick thickness, research has been conducted in recent years on lattice bricks of various shapes, and bricks with a cruciform cross section and a prismatic shape with a through passage in the axis have been proposed. (Glass Tech
nology Volt, 26 No. 6 (1985
), JP-A-55-149139).

Cross-shaped and prismatic bricks ensure the stability of the lattice structure and reduce the brick thickness, which improves the heat transfer area and improves the heat exchange efficiency of the storage and heat chamber to some extent. It is possible to do so.

[Problems to be Solved by the Invention] However, cross-shaped, prismatic bricks, etc. have complicated shapes. Therefore, internal stress generated by repeated heating and cooling is locally concentrated, which tends to cause thermal cracking, resulting in poor durability. Also, as a matter of course, complex shapes have the disadvantage that the production cost of each brick is high and the time and effort required during construction increases.

The present invention solves the above-mentioned conventional problems, and can increase the heat transfer area and improve the heat exchange efficiency of the heat storage chamber by reducing the thickness without impairing the stability of the lattice structure. The object of the present invention is to provide a lattice brick for a heat storage chamber and a method for constructing the same, which can prevent thermal cracking due to stress and greatly improve durability and durability.

[Means for Solving the Problems] The lattice brick for a heat storage chamber of the present invention has a cylindrical shape with both end surfaces being parallel surfaces serving as a top surface and a bottom surface.

The method for constructing a heat storage chamber according to the present invention is characterized in that the cylindrical bricks are stacked in a lattice shape with the axial direction being vertical.

[Function] Since the lattice brick of the present invention has a cylindrical shape, its strength is high, and therefore the brick wall thickness can be reduced. Also, the structure made of stacked bricks has excellent stability.

The brick of the present invention can have a large surface area (heat transfer area) per unit amount of lattice brick and per unit spatial volume of the heat storage chamber. Therefore, the heat transfer area can be increased and the heat exchange efficiency can be improved. Furthermore, internal stress due to repeated heating and cooling is made uniform, and cracks and the like due to local stress are prevented. Therefore, durability is greatly improved.

According to the method for constructing a heat storage chamber of the present invention in which the lattice bricks of the present invention are stacked in a lattice shape, it is possible to generate a moderate turbulence between the bricks, resulting in extremely high heat transfer efficiency and durability. It is possible to construct a heat storage chamber with excellent performance.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the lattice brick of the present invention, and FIG. 2 is a plan view thereof. As shown in the figure, the lattice brick 1 of this embodiment has a cylindrical shape with a top surface la and a bottom surface 1b on both end surfaces, and the top surface 1a and the bottom surface 1b have a convex portion 2 and a concave portion for fitting, respectively. 3 is provided. In this embodiment, the convex portions 2 and the recessed portions 3 are provided at equal radial values from the axis of the lattice brick 1 and at quarter positions in the circumferential direction of the axial center, so that the lattice is stacked. At this time, the convex portion 2 of the lower brick is configured to fit into the recess 3 of the upper brick. By providing the convex portions 2 and the concave portions 3, it becomes possible to further improve the stability of the structure formed by stacking bricks.

In the present invention, the inner diameter, wall thickness, height, etc. of the brick 1 are not particularly limited, and are appropriately determined depending on the purpose of use, etc.
For example, it is suitable for practical use that the inner diameter A, wall thickness B, and height C shown in FIG. 1 are within the following ranges.

■ Cylinder inner diameter A: 100 to 200 mm ■ Cylinder wall thickness B: 30 to 75 mm ■ Cylinder height C: 50 to 500 mm The reasons for this are as follows. If the cylindrical inner diameter A is less than 100 mm, clogging is likely to occur due to dust-containing exhaust gas, and the cylinder cannot withstand long-term use. On the other hand, when A exceeds 200 mm, thermal efficiency decreases. If the cylinder wall thickness B is less than 30 mm, the strength etc. will be insufficient, it will not be able to withstand long-term use, and the thermal efficiency will be low. Also, 75m
If it exceeds m, thermal efficiency will decrease. It is advantageous for the cylinder height C to be 50 to 500 mm in terms of brick manufacturing and lattice construction work.

Since the lattice brick of the present invention has a cylindrical shape, it has excellent mechanical strength and stability. The brick of the present invention may be any of electroformed bricks, fired bricks, unfired bonded bricks, etc., which are usually used for heat storage chamber lattice bricks.

As the material of the brick, various fireproof materials such as chamotte, high alumina, chromium chloride, chromium magnesia, and magnesia can be used.

Note that the lattice bricks shown in FIGS. 1 and 2 are one embodiment of the present invention, and the present invention does not exceed the gist thereof.
The present invention is not limited to what is shown in the drawings. For example, it is possible to adopt other aspects regarding the shapes, arrangement intervals, and other configurations of the fitting projections and recesses. Further, the above-mentioned convex portions and concave portions may not be provided.

Next, a method for constructing a heat storage chamber according to the present invention will be explained. FIG. 4 shows a cross-sectional view of a general glass melting tank kiln. In the illustrated tank kiln, combustion air is supplied to opening 1
The lattice bricks 1 taken in from 5a and inside the heat storage chamber 13a
Heated at 4a. Then, a burner (not shown) installed in the flow path 12a burns the fuel, thereby heating the glass in the melting tank 11. The exhaust gas is introduced into the heat storage chamber 13b through the flow path 12b and heats the lattice bricks 14b inside the room. After a certain period of time (usually about 20 degrees), the burner is switched and heating is performed by a burner (not shown) installed in the flow path 12b. In this case, the combustion air introduced from the opening 15b enters the heat storage chamber 1.
3b and passes through the lattice bricks 14b, during which time it is preheated. After heating the glass in the melting tank 11, the exhaust gas enters the heat storage chamber 13a through the flow path 12a, heats the lattice bricks 14a, and then is discharged from the opening 15a. By repeating such operations, the glass is melted and heat is recovered from the combustion exhaust gas.

In the method of the present invention, when constructing the heat storage chamber of such a tank kiln, the cylindrical lattice bricks of the present invention described above are stacked in a lattice shape with the sleeve directions aligned vertically.

FIG. 3 is a plan view showing an embodiment of the method for constructing the lattice brick 1 shown in FIGS. 1 and 2. FIG. In this embodiment, the lower brick 1 (IA, IB, IC, ID)
is placed at the midpoint of the four sides of the square lattice S. Then, brick 1 (IE, IF,
IG.

IH) are arranged at the four corners of the square lattice S, and the upper brick 1 (II) is arranged at the center of the square lattice S. The brick I
Bricks (as shown) are stacked on the upper side of E to II in the same arrangement pattern as the bricks IA to ID. In the above description, reference is made to bricks IA to 1, but a large number of bricks 1 are also arranged and stacked around these bricks IA to II as shown in the figure.

In this way, the cylindrical bricks of the invention are constructed in the form of a grid.

At this time, the lattice brick arrangement pitch, that is, J2+ in FIG. 3, varies depending on the size of the bricks, etc., but when using bricks within the range specified in the above ■ to ■,
It is preferable to set it as 130-275 mm. If the arrangement pitch fl+ is less than 130 mm, blockage is likely to occur due to the associated exhaust gas (and if it exceeds 275 mm, sufficient thermal efficiency may not be obtained.

Further, it is preferable to provide appropriate gaps 22 between adjacent lattice bricks 1. By providing this gap C2, appropriate turbulence is generated in the gas flow in the heat storage chamber in which the bricks are stacked in a lattice, thereby improving thermal efficiency.

If the gap 12 is 10 mm ungrooved, sufficient turbulence cannot be obtained, so it is usually preferable that the gap 12 is 10 mm or more.

[Effects of the Invention] As detailed above, according to the lattice brick for heat storage chambers of the present invention, a high degree of construction stability is ensured even when the brick wall thickness is reduced to the optimal thickness for heat transfer efficiency. can do. In addition, the internal stress caused by repeated heating and cooling is made uniform, and the mechanical strength is also high, so durability is improved and the lifespan is extremely long. Furthermore, it is possible to increase the heat transfer area per unit space volume of the heat storage chamber for a single-position fire of the lattice bricks, and the thermal efficiency is greatly improved.

According to the method for constructing a heat storage chamber of the present invention, a heat storage chamber with extremely high thermal efficiency, excellent thermal and mechanical stability, and significantly improved durability can be easily constructed. Further, according to the method of the present invention, it is also possible to realize a heat storage chamber lattice structure with even higher heat exchange efficiency by generating appropriate turbulence in the heat storage chamber to promote heat transfer efficiency.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the lattice brick of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a plan view showing an embodiment of the construction direction of the present invention, and Fig. 4 is It is a schematic cross-sectional view showing a tank kiln for melting glass. 1... Lattice brick, 2... Convex part for fitting, 3...
...Mating recess. Agent Patent Attorney Tsuyoshi Shigeno Figure 3

Claims (2)

[Claims] (1) A lattice brick for a heat storage chamber, which has a cylindrical shape with both end surfaces being parallel surfaces serving as a top surface and a bottom surface. (2) A method for constructing a lattice brick for a heat storage chamber, which comprises stacking the bricks described in claim 1 in a lattice shape with their cylinder axes in the vertical direction.