JPH0380728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the shape of a refractory used in a heat storage chamber of a glass melting furnace, and particularly to a refractory for a heat storage chamber made by a melt casting method.

BACKGROUND ART Exhaust gas discharged from the outlet of a glass melting furnace is guided to a heat storage chamber and heats a refractory for the heat storage chamber. At this time, heat transfer from the high-temperature exhaust gas to the refractory is mainly through radiation heat transfer.

In contrast, when heating cold air with preheated refractories, one must rely exclusively on convective heat transfer. For this reason, it is extremely important that the refractory for the heat storage chamber have a large specific surface area, and it is desirable that the air flow be turbulent rather than laminar.

The shape of these refractories for heat storage chambers is generally prismatic, but in the past, they were cross-shaped or prismatic (cylindrical) (Refer to Publication No. 2006) has been disclosed. Further, some of these were made of refractories made by melt casting, that is, what is generally called electrocast refractories.

FIG. 5 shows the one disclosed in Japanese Patent Application Laid-Open No. 149139/1983, which has a rectangular cylindrical shape. This has an octagonal outer ring 30 and a square flow path 40 passing through the center in cross section, and has a substantially uniform wall thickness.

In use, a large number of these are lined up so that their ridge faces 50 are in contact with each other to form a layer, and by stacking these layers vertically in several stages, a large number of vertically communicating flow channels with a square cross section are created. Heat exchange is performed by alternately flowing hot exhaust gas and cold air through this flow path.

For example, the specific surface area of conventional refractories will be explained using FIG.

In FIG. 5, the individual refractories have an octagonal outer ring portion 30 and are adjacent to each other at the edge portion (edge surface 50). In such a state, the gas flow path has an inner flow path 40 with a square cross section inside each refractory,
Two types of flow channels are formed: an outer flow channel 60 having a rectangular cross section and surrounded by other four refractories on the outside.
Of the total surface area of the refractory, the inner and outer channels 4 are involved in heat exchange as the refractory for the heat storage chamber.
This is only the part that touches 0 and 60.

Therefore, the specific surface area here refers to the refractory 1
The inner and outer flow paths 40, 6 with respect to the volume (bulk) calculated from the dimensions of the outer ring portion 30 (outer ring shell)
It is the ratio of the area of the part that is in direct contact with 0. Therefore, the areas of the top, bottom, and ridge surfaces are not included.

Calculating the specific surface area in Fig. 5 based on this definition, the dimensions of one refractory in Fig. 5 are, for example, 150 mm x 150 mm in cross section of the inner channel 40, wall thickness 4 mm, and height 140 mm. , the specific surface area is 0.15×0.14×8/(0.23×0.23−2×0.04×0.04)×0.
14 = 24.1m ² /m ² is calculated.

Problems to be Solved by the Invention However, the above technology still lacks in specific surface area, and there has been a constant need for improvement. Furthermore, since the walls of the gas flow path are substantially smooth, the gas flow is laminar and does not become turbulent, making it difficult to effectively conduct convective heat transfer.

Furthermore, during use, the refractories for the heat storage chamber are arranged so that their ridges are in contact with each other, but since these ridges are smooth, they tend to slip easily and the structure as a whole is not stable. As a result, when stacked high, they were prone to collapse due to external forces. For this reason, the capacity and safety of the heat storage chamber were low.

Purpose of the Invention The present invention has been made in order to solve the above-mentioned problems, and its purpose is to provide a refractory for a heat storage chamber that effectively conducts convective heat transfer in a gas flow and is resistant to collapse due to external force when stacked high. There is.

Summary of the Invention The refractory for a heat storage chamber of the present invention is summarized in the claims.

Means for Solving the Problems The refractory for a heat storage chamber of the present invention has a cylindrical shape with an octagonal outer contour 1, as shown in FIG. Gas flows inside and outside this cylindrical shape. In such a refractory for a heat storage chamber, an inner wall portion 1d of the refractory forming an inner flow path, an outer wall portion 1c forming an outer flow path, and a joint surface with other refractories for a heat storage chamber are formed. The ridge surface portion 8 has unevenness 5, 4, and 6 perpendicular to the gas flow path, respectively. These unevennesses 4, 5, and 6 have a continuation of alternating peaks and valleys in a bellows shape, and the direction of the ridgeline of the peaks is perpendicular to the upper surface 1a and lower surface 1b of the refractory for the heat storage chamber in the inner wall portion 1d. , the upper surface 1a and the lower surface 1 in the outer wall portion 1c and the ridge surface portion 8.
parallel to b.

Effect By providing the inner wall portion and the outer wall portion with irregularities perpendicular to the gas flow path in this manner, the overall specific surface area can be increased. Furthermore, the unevenness provided on the outer wall acts to cause turbulence in the gas flow, and the unevenness provided on the ridge surface meshes with other adjacent refractories for the heat storage chamber, creating a stable stacked structure with no slippage. can be provided.

Embodiment FIGS. 1 and 2 show a refractory for a heat storage chamber according to the present invention, which has an octagonal outer contour 1 and a rectangular inner channel passing through the center in the cross section, that is, the upper surface 1a and the lower surface 1b. I have 7. To give an example of the dimensions of this inner flow path 7, the vertical and horizontal dimensions are each 150 mm.
The wall thickness W of the outer contour 1 is, for example, approximately 40
mm. This refractory for a heat storage chamber is made by a melt casting method.

To explain the outline of this manufacturing process, there is a core in the shape of an inner channel made by solidifying refractory sand with a binder such as phenol resin, and an outer mold made of the same material is placed around this core. A space with the same shape as the product (refractory) is created, the molten refractory is poured into this space, and then slowly cooled and solidified. After slow cooling, the core and outer mold, which have been weakly sintered due to high heat, are broken and removed to take out the product.

Apart from the upper surface 1a and lower surface 1b of the refractory produced in this way, the outer wall 1c, inner wall 1d, and ridge surface 8 are provided with unevenness 4, unevenness 5, and unevenness 6, respectively. The shapes of these unevenness 4, 5, and 6 are bellows-like. The height h of the unevenness 4, 5, and 6 is, for example, 10 mm, and the shape is a series of alternating peaks and valleys.
For example, the length of the base of the mountain on the inner wall 1d side is 20 mm.
The length of the base of the mountain on the outer wall portion 1c side is 40 mm.

The ridgelines of these mountains are located on the upper surface 1a of the inner wall portion 1d.
and is perpendicular to the lower surface 1b. The height H of the refractory is, for example, 140 mm. Figure 2 is A of Figure 1.
-A cross section taken along the line A is shown to aid understanding of FIG. 1. W in FIG. 2 indicates the distance between the top of the mountain on the inner wall portion 1d side and the top of the mountain on the outer wall portion 1c side.

FIG. 3 and FIG. 4 are diagrams showing a joint portion at a ridge surface when a plurality of refractories of the present invention are joined. These ridge portions 8 are provided with bellows-shaped unevenness 6 similar to the unevenness 5 and 4 provided on the inner wall portion 1d and the outer wall portion 1c. The refractory on the left side engages with the refractory on the right side at the ridge portions 8, 8. In this figure, if the refractory on the left side is turned upside down, it becomes the refractory on the right side. That is, the peaks and valleys are arranged so that it is possible to combine refractory bricks as shown in FIG. 3 using refractories all having the same shape.

As a result, the specific surface area of the heat storage chamber refractory of this example was 4×0.15×0.14×√2+4×0.15×0.14×1.115/(0.2
3×0.23−2×0.04×0.04)×0.14 = 30.5m ² /m ³ was reached.

Comparing this with the above value of 24.1 m ² /m ³ for a conventional gas flow passage with no unevenness on the wall (wall thickness: 40 mm, flow passage cross section: 150 x 150 mm, height: 150 mm).
In fact, the specific surface area increased by 26.5%.

However, the present invention is not limited to the embodiments described above. The shape of the unevenness is not limited to triangular peaks and valleys. The height h of the peak can be different between the inner wall portion 1d and the outer wall portion 1c.

Furthermore, if the inner wall portion 1d is slightly tapered, the core can be easily removed during manufacturing.

Effects of the Invention As is clear from the above explanation, the unevenness provided on the outer wall and inner wall of this refractory has a specific surface area of about 27
% could be increased.

On the other hand, these refractories are used in combination horizontally and vertically, and in that case, the outer wall of each refractory constitutes an outer gas passage through which gas flows, and the inner wall constitutes an inner gas flow passage. constitute a road. The outer wall and the inner wall are in a state of exchanging heat with the high-temperature gas flow in contact with them.

Under such circumstances, the refractory of the present invention has irregularities perpendicular to the gas flow path on the outer wall,
In addition, these irregularities have a bellows-like series of alternating peaks and valleys, and the ridgelines of the peaks are parallel to the upper and lower surfaces of this refractory, resulting in significant turbulence in the gas flow passing through the outer flow path. This will increase the heat exchange capacity between the gas stream and the refractory.

In particular, during use, by stacking each stage in the vertical direction so that the gas flow passes through the outer flow path and the inner flow path alternately, the turbulent flow that occurs on the outer wall sequentially acts on the inner wall. The heat exchange capacity of is also increased. As a result,
The synergistic effect with the above-mentioned increase in specific surface area results in a significant increase in the heat exchange capacity of the entire refractory.

Moreover, the unevenness provided on the ridge surface becomes one with the adjacent refractory material by firmly interlocking with the adjacent refractory material. As a result, they are extremely stable mechanically and do not easily collapse even when stacked high. Therefore, the capacity and safety of the heat storage chamber are improved.

Furthermore, since the inner wall of this refractory consists of only surfaces perpendicular to the upper and lower surfaces of this refractory,
Another advantage is that it is easy to manufacture a mold for this part and to remove the mold after casting. Additionally, if the inner wall is slightly tapered, removal of the mold will become even easier.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the refractory for a heat storage chamber according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line B-B of the joint, and FIG. 5 is a plan view showing a state in which conventional refractories are arranged. 1...outer contour, 1a...top surface, 1b...bottom surface, 1c...
Outer wall part, 1d... Inner wall part, 4, 5, 6... Unevenness, 7...
Channel, 8... ridge surface portion.

Claims (1)

[Claims] 1. In a refractory for a heat storage chamber that has a cylindrical shape with an octagonal outer contour and gas flows inside and outside the cylindrical shape, the inner wall of the refractory forming the inner flow path and the outer side The outer wall forming the flow path and the ridge surface forming the joint surface with other refractories for the heat storage chamber each have unevenness perpendicular to the flow path, and these unevenness have a bellows shape. Mountains and valleys are continuous alternately, and the direction of the ridgeline of the mountain is perpendicular to the upper and lower surfaces of the refractory for heat storage chamber in the inner wall portion, and parallel to the upper and lower surfaces in the outer wall portion and the ridge surface. Refractories for heat storage chambers.